Circular Economy最新文献_第4页

A systematic review on the recycling of polyurethane products from offshore applications 对海上应用聚氨酯产品回收利用的系统性审查

Circular Economy

Pub Date : 2025-03-01 Epub Date: 2025-02-26 DOI: 10.1016/j.cec.2025.100129

Ali Karrech, He Zhou

With the growing environmental awareness, more scrutiny is placed on the responsible handling of materials during the decommissioning of offshore facilities no longer in use. These facilities may contain polyurethane, renowned for its versatility, resilience, stability, buoyancy, and insulation (thermal, acoustic, and electrical). Recycling polyurethane (PU) from offshore facilities is both an opportunity and a challenge that has not been addressed thoroughly yet in the published literature. While recycling polyurethane from domestic and onshore industrial applications is relatively well-documented, literature reviews on recycling PU from offshore environments are scarce. To date, there are no comprehensive syntheses on offshore PU recycling approaches. The purpose of this review is to identify published articles that (1) describe the recycling of PU with a special focus on offshore oil and gas production and transport, (2) explore potential applications/consumers for recycled PU products, and (3) examine the economic/environmental viability of PU recycling in a typical offshore province, the North West Shelf of Australia.

A systematic search was conducted using three electronic databases (Scopus, ScienceDirect, and Web of Science) to source articles that describe the recycling of offshore polyurethane and its potential. Recycling methods were extracted and synthesised to identify their advantages, disadvantages, and possible gaps in the existing body of knowledge. By synthesising the literature on PU recycling, analysing the local market, and conducting a life cycle assessment of recycling methods, this study demonstrated that mechanical recycling is superior to its alternatives in terms of environmental impact and economic viability.

随着环保意识的增强，在不再使用的海上设施退役期间，对材料的负责任处理受到了更多的审查。这些设施可能含有聚氨酯，以其多功能性、弹性、稳定性、浮力和绝缘性（热、声、电）而闻名。从海上设施中回收聚氨酯（PU）既是机遇也是挑战，在已发表的文献中尚未得到彻底解决。虽然从国内和陆上工业应用中回收聚氨酯的文献记录相对较好，但从海上环境中回收PU的文献综述却很少。到目前为止，还没有关于海上PU回收方法的综合研究。本综述的目的是找出以下已发表的文章：(1)描述PU的回收利用，特别关注海上油气生产和运输；(2)探索回收PU产品的潜在应用/消费者；(3)在澳大利亚西北大陆架一个典型的海上省份研究PU回收利用的经济/环境可行性。通过三个电子数据库（Scopus， ScienceDirect和Web of Science）进行了系统的搜索，以获取描述海上聚氨酯回收及其潜力的文章。提取和综合回收方法，以确定其优点，缺点和现有知识体系中可能存在的差距。通过综合有关PU回收的文献，分析当地市场，并对回收方法进行生命周期评估，本研究表明，在环境影响和经济可行性方面，机械回收优于其替代品。

{"title":"A systematic review on the recycling of polyurethane products from offshore applications","authors":"Ali Karrech, He Zhou","doi":"10.1016/j.cec.2025.100129","DOIUrl":"10.1016/j.cec.2025.100129","url":null,"abstract":"<div><div>With the growing environmental awareness, more scrutiny is placed on the responsible handling of materials during the decommissioning of offshore facilities no longer in use. These facilities may contain polyurethane, renowned for its versatility, resilience, stability, buoyancy, and insulation (thermal, acoustic, and electrical). Recycling polyurethane (PU) from offshore facilities is both an opportunity and a challenge that has not been addressed thoroughly yet in the published literature. While recycling polyurethane from domestic and onshore industrial applications is relatively well-documented, literature reviews on recycling PU from offshore environments are scarce. To date, there are no comprehensive syntheses on offshore PU recycling approaches. The purpose of this review is to identify published articles that (1) describe the recycling of PU with a special focus on offshore oil and gas production and transport, (2) explore potential applications/consumers for recycled PU products, and (3) examine the economic/environmental viability of PU recycling in a typical offshore province, the North West Shelf of Australia.</div><div>A systematic search was conducted using three electronic databases (Scopus, ScienceDirect, and Web of Science) to source articles that describe the recycling of offshore polyurethane and its potential. Recycling methods were extracted and synthesised to identify their advantages, disadvantages, and possible gaps in the existing body of knowledge. By synthesising the literature on PU recycling, analysing the local market, and conducting a life cycle assessment of recycling methods, this study demonstrated that mechanical recycling is superior to its alternatives in terms of environmental impact and economic viability.</div></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"4 1","pages":"Article 100129"},"PeriodicalIF":0.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Material flow analysis and modelling of the feedstock potential for recycling polystyrene 回收聚苯乙烯原料潜力的物料流分析与建模

Circular Economy

Pub Date : 2025-03-01 Epub Date: 2025-02-21 DOI: 10.1016/j.cec.2025.100127

Malin zu Castell-Rüdenhausen

Global plastic production has recently experienced dramatic growth, which is expected to accelerate. To reduce the environmental impacts related to plastic production and consumption, European policies call for increased plastic recycling. Polystyrene is a main commodity plastic with good recyclability; however, today, recycling levels for polystyrene are lower than those for other commodity plastics. To promote plastic circularity and increase polystyrene recycling, this study investigates feedstock availability for polystyrene recycling, using Finland as a case study. Key waste streams containing polystyrene are explored: municipal solid waste, plastic packaging waste, construction and demolition waste, as well as waste from electrical and electronic equipment. A spreadsheet-based material flow model was developed to estimate the extraction of polystyrene from waste streams in different scenario simulations. Data entered into the model was collected via literature review supported by expert interviews. This model can be applied to other regions by tailoring the input data. The results show significant potential for polystyrene recycling by implementing collection schemes for polystyrene at construction sites and by extracting polystyrene from separately collected plastic packaging waste and waste electronics, as well as by introducing industrial post-sorting of residual municipal solid waste. The findings indicate the potential of more than 10 thousand tonnes of polystyrene as feedstock for recycling, of which up to 5.2 thousand tonnes originate from the construction sector, 2.6 thousand tonnes from separately collected plastic packaging waste, 1.8 thousand tonnes from waste from electrical and electronic equipment, and 3.2 thousand tonnes from residual municipal solid waste. It can be concluded that there is significant potential for polystyrene recycling in Finland, which is partly driven by European recycling targets. However, a major obstacle for plastic recycling is related to the lack of data related to plastic waste flows.

全球塑料生产最近经历了急剧增长，预计将加速增长。为了减少与塑料生产和消费相关的环境影响，欧洲的政策呼吁增加塑料回收。聚苯乙烯是一种主要的商品塑料，具有良好的可回收性；然而，今天，聚苯乙烯的回收水平低于其他商品塑料。为了促进塑料循环和增加聚苯乙烯的回收，本研究以芬兰为例，调查了聚苯乙烯回收的原料可用性。探讨了含有聚苯乙烯的主要废物流：城市固体废物，塑料包装废物，建筑和拆除废物，以及来自电气和电子设备的废物。建立了一个基于电子表格的物料流模型，用于在不同情景模拟中估计从废物流中提取聚苯乙烯的情况。输入模型的数据是通过文献综述和专家访谈收集的。通过定制输入数据，可以将该模型应用于其他地区。研究结果表明，通过在建筑工地实施聚苯乙烯收集计划，从单独收集的塑料包装废物和废弃电子产品中提取聚苯乙烯，以及对剩余的城市固体废物进行工业后分类，聚苯乙烯的回收潜力巨大。研究结果表明，有超过1万吨聚苯乙烯作为回收原料的潜力，其中高达52000吨来自建筑行业，2600吨来自单独收集的塑料包装废物，1800吨来自电气和电子设备废物，3200吨来自剩余的城市固体废物。可以得出结论，芬兰的聚苯乙烯回收潜力巨大，这在一定程度上是由欧洲回收目标推动的。然而，塑料回收的一个主要障碍与缺乏与塑料废物流动有关的数据有关。

{"title":"Material flow analysis and modelling of the feedstock potential for recycling polystyrene","authors":"Malin zu Castell-Rüdenhausen","doi":"10.1016/j.cec.2025.100127","DOIUrl":"10.1016/j.cec.2025.100127","url":null,"abstract":"<div><div>Global plastic production has recently experienced dramatic growth, which is expected to accelerate. To reduce the environmental impacts related to plastic production and consumption, European policies call for increased plastic recycling. Polystyrene is a main commodity plastic with good recyclability; however, today, recycling levels for polystyrene are lower than those for other commodity plastics. To promote plastic circularity and increase polystyrene recycling, this study investigates feedstock availability for polystyrene recycling, using Finland as a case study. Key waste streams containing polystyrene are explored: municipal solid waste, plastic packaging waste, construction and demolition waste, as well as waste from electrical and electronic equipment. A spreadsheet-based material flow model was developed to estimate the extraction of polystyrene from waste streams in different scenario simulations. Data entered into the model was collected via literature review supported by expert interviews. This model can be applied to other regions by tailoring the input data. The results show significant potential for polystyrene recycling by implementing collection schemes for polystyrene at construction sites and by extracting polystyrene from separately collected plastic packaging waste and waste electronics, as well as by introducing industrial post-sorting of residual municipal solid waste. The findings indicate the potential of more than 10 thousand tonnes of polystyrene as feedstock for recycling, of which up to 5.2 thousand tonnes originate from the construction sector, 2.6 thousand tonnes from separately collected plastic packaging waste, 1.8 thousand tonnes from waste from electrical and electronic equipment, and 3.2 thousand tonnes from residual municipal solid waste. It can be concluded that there is significant potential for polystyrene recycling in Finland, which is partly driven by European recycling targets. However, a major obstacle for plastic recycling is related to the lack of data related to plastic waste flows.</div></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"4 1","pages":"Article 100127"},"PeriodicalIF":0.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hybrid kinetic analysis of FR-2 and FR-4 type printed circuit boards: A thermogravimetric analysis FR-2和FR-4型印刷电路板的混合动力学分析：热重分析

Circular Economy

Pub Date : 2025-03-01 Epub Date: 2024-12-30 DOI: 10.1016/j.cec.2024.100125

Anuj Thukral , Adhithiya Venkatachalapati Thulasiraman , Arun K. Vuppaladadiyam , Savan Kumar Patel , Manoj Kumar Jena , Kalpit Shah , Neha Gupta , Rahul Saha , Anuushka Pal , Parveen Saini

This study investigated the non-isothermal (5, 10, and 20 °C/min) pyrolysis of non-metallic fractions (NMFs) of the FR-2 (phenolic resin reinforced with laminated paper) and FR-4 (epoxy resin reinforced with glass fiber) type waste printed circuit boards (WPCBs), under an inert atmosphere of flowing nitrogen gas. Three iso-conversional kinetic models (Friedman, Flyn-Wall–Ozawa (FWO), and Kissinger–Akahira–Sunose (KAS) approaches) were employed to understand the kinetics of the pyrolysis process. Thermogravimetric-differential thermogravimetric (TG-DTG) analysis revealed that FR-4 NMFs displayed a shift in mass loss above 287 °C at a heating rate of 10 °C/min and reached 95% conversion at 515 °C. In the case of the FR-2 NMFs, two distinct devolatilization zones were observed between 250–330 °C and 330–530 °C. The kinetic investigation revealed mean activation energy values of 264.38 kJ/mol for FR-2 and 221.99 kJ/mol for FR-4. The pyrolysis reaction mechanism for FR-2 NMFs displayed a decreasing trend for conversion (α), which was indicative of the simplified third-order model (F3) until α = 0.5 and shifted to second-order diffusion (D2) in the later part of the conversion. For FR-4 NMFs, the reaction function f(α) is between random nucleation with three nuclei on the individual particle (F3) and random nucleation with one nucleus on the individual particle (F1) over the selected range of conversion. For the FR-2 and FR-4 NMFs, the average ΔH values were 259.30 and 217.00 kJ/mol, and ΔG values were 161.03 and 176.92 kJ/mol, respectively.

研究了FR-2（层压纸增强酚醛树脂）和FR-4（玻璃纤维增强环氧树脂）废印刷电路板（wpcb）非金属组分在流动氮气惰性气氛下的非等温（5、10和20℃/min）热解。采用三种等转换动力学模型（Friedman、flynn - wall - ozawa （FWO）和Kissinger-Akahira-Sunose (KAS)）来理解热解过程的动力学。热重-差热重（TG-DTG）分析表明，FR-4 NMFs在升温速率为10°C/min时，在287°C以上的质量损失发生了变化，在515°C时转化率达到95%。在FR-2 NMFs的情况下，在250-330°C和330-530°C之间观察到两个不同的脱挥发区。动力学研究表明FR-2的平均活化能为264.38 kJ/mol， FR-4的平均活化能为221.99 kJ/mol。FR-2 NMFs的热解反应机制表现为转化率（α）呈下降趋势，在α = 0.5之前为简化的三阶模型（F3），在转化率后期转为二阶扩散（D2）。对于FR-4 NMFs，反应函数f（α）在选择的转化范围内介于单个粒子上随机成核（F3）和单个粒子上随机成核（F1）之间。FR-2和FR-4 NMFs的平均ΔH分别为259.30和217.00 kJ/mol， ΔG分别为161.03和176.92 kJ/mol。

{"title":"Hybrid kinetic analysis of FR-2 and FR-4 type printed circuit boards: A thermogravimetric analysis","authors":"Anuj Thukral , Adhithiya Venkatachalapati Thulasiraman , Arun K. Vuppaladadiyam , Savan Kumar Patel , Manoj Kumar Jena , Kalpit Shah , Neha Gupta , Rahul Saha , Anuushka Pal , Parveen Saini","doi":"10.1016/j.cec.2024.100125","DOIUrl":"10.1016/j.cec.2024.100125","url":null,"abstract":"<div><div>This study investigated the non-isothermal (5, 10, and 20 °C/min) pyrolysis of non-metallic fractions (NMFs) of the FR-2 (phenolic resin reinforced with laminated paper) and FR-4 (epoxy resin reinforced with glass fiber) type waste printed circuit boards (WPCBs), under an inert atmosphere of flowing nitrogen gas. Three iso-conversional kinetic models (Friedman, Flyn-Wall–Ozawa (FWO), and Kissinger–Akahira–Sunose (KAS) approaches) were employed to understand the kinetics of the pyrolysis process. Thermogravimetric-differential thermogravimetric (TG-DTG) analysis revealed that FR-4 NMFs displayed a shift in mass loss above 287 °C at a heating rate of 10 °C/min and reached 95% conversion at 515 °C. In the case of the FR-2 NMFs, two distinct devolatilization zones were observed between 250–330 °C and 330–530 °C. The kinetic investigation revealed mean activation energy values of 264.38 kJ/mol for FR-2 and 221.99 kJ/mol for FR-4. The pyrolysis reaction mechanism for FR-2 NMFs displayed a decreasing trend for conversion (<em>α</em>), which was indicative of the simplified third-order model (F3) until <em>α</em> = 0.5 and shifted to second-order diffusion (D2) in the later part of the conversion. For FR-4 NMFs, the reaction function <em>f</em>(<em>α</em>) is between random nucleation with three nuclei on the individual particle (F3) and random nucleation with one nucleus on the individual particle (F1) over the selected range of conversion. For the FR-2 and FR-4 NMFs, the average Δ<em>H</em> values were 259.30 and 217.00 kJ/mol<em>,</em> and Δ<em>G</em> values were 161.03 and 176.92 kJ/mol, respectively.</div></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"4 1","pages":"Article 100125"},"PeriodicalIF":0.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143139078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unlocking the potential of rice straw: Sustainable utilization strategies for Bangladesh 释放稻草的潜力：孟加拉国的可持续利用战略

Circular Economy

Pub Date : 2025-03-01 Epub Date: 2025-01-16 DOI: 10.1016/j.cec.2025.100126

Bidhan Nath , Md Moudud Ahmmed , Subrata Paul , Md Durrul Huda , Mohammad Afzal Hossain , Sharmin Islam

Bangladesh annually produces vast amounts of rice straw. However, they have low utilization efficiency, with a significant portion being wasted, and are usually openly burned (cooking food/heating) by farmers, lost during collection, and discarded or directly burned in the field. Straw holds immense potential for conversion into valuable products beyond its raw form. In the 2021–2022 season alone, Bangladesh produced 52.25 million tons of rice straw, with an energy potential of 189.52 × 10⁹ MJ. This study provided tangible information on various aspects of rice straw, including its availability, distribution, energy potential, common uses, and causes and impact as waste. Moreover, it is a comparative analysis of traditional uses alongside recent innovation utilization of straw. Suggested management options incorporating multifaceted conversion strategies are explored to encourage alternative utilization, which requires policies and diverse initiatives with financial support. Innovative approaches, such as the conversion of straw to renewable energy, along with alternative application strategies, are highlighted as promising technologies that can enhance flexibility and efficiency in utilization. Moreover, a comparative analysis has been carried out on traditional straw uses alongside recent innovations in its utilization, such as biogas production, biofuel generation, biochar creation, and composting, alongside value-added applications such as papermaking and industrial materials. A strategic approach to overcoming challenges and leveraging opportunities in rice straw utilization through technological advancements is proposed, aiming for sustainable and environmentally friendly practices. The current study emphasizes the importance of further research, particularly in the exploration of industrial and commercial applications of rice straw, to maximize its potential as a valuable agricultural residue.

孟加拉国每年生产大量的稻草。但利用效率较低，有相当一部分被浪费，通常被农民公开焚烧（烹饪食物/加热），在收集过程中丢失，丢弃或直接在田间焚烧。秸秆具有巨大的潜力，可以将其转化为有价值的产品。仅在2021-2022年，孟加拉国就生产了5225万吨稻草，能源潜力为189.52 × 109兆焦耳。这项研究提供了关于稻草的各个方面的具体信息，包括稻草的可得性、分布、能源潜力、常见用途以及作为废物的原因和影响。此外，它是传统用途的比较分析与最近的创新利用秸秆。探讨了建议的管理办法，其中包括多方面的转换战略，以鼓励替代利用，这需要政策和有财政支助的各种倡议。将秸秆转化为可再生能源等创新方法以及其他应用战略被强调为有希望的技术，可以提高利用的灵活性和效率。此外，还对传统秸秆用途与最近的秸秆利用创新（如沼气生产、生物燃料生产、生物炭制造和堆肥）以及造纸和工业材料等增值应用进行了比较分析。提出了一种通过技术进步来克服挑战和利用机遇的战略方法，旨在实现可持续和环境友好的做法。目前的研究强调了进一步研究的重要性，特别是在探索水稻秸秆的工业和商业应用方面，以最大限度地发挥其作为有价值的农业残留物的潜力。

{"title":"Unlocking the potential of rice straw: Sustainable utilization strategies for Bangladesh","authors":"Bidhan Nath , Md Moudud Ahmmed , Subrata Paul , Md Durrul Huda , Mohammad Afzal Hossain , Sharmin Islam","doi":"10.1016/j.cec.2025.100126","DOIUrl":"10.1016/j.cec.2025.100126","url":null,"abstract":"<div><div>Bangladesh annually produces vast amounts of rice straw. However, they have low utilization efficiency, with a significant portion being wasted, and are usually openly burned (cooking food/heating) by farmers, lost during collection, and discarded or directly burned in the field. Straw holds immense potential for conversion into valuable products beyond its raw form. In the 2021–2022 season alone, Bangladesh produced 52.25 million tons of rice straw, with an energy potential of 189.52 × 10<sup>9</sup> MJ. This study provided tangible information on various aspects of rice straw, including its availability, distribution, energy potential, common uses, and causes and impact as waste. Moreover, it is a comparative analysis of traditional uses alongside recent innovation utilization of straw. Suggested management options incorporating multifaceted conversion strategies are explored to encourage alternative utilization, which requires policies and diverse initiatives with financial support. Innovative approaches, such as the conversion of straw to renewable energy, along with alternative application strategies, are highlighted as promising technologies that can enhance flexibility and efficiency in utilization. Moreover, a comparative analysis has been carried out on traditional straw uses alongside recent innovations in its utilization, such as biogas production, biofuel generation, biochar creation, and composting, alongside value-added applications such as papermaking and industrial materials. A strategic approach to overcoming challenges and leveraging opportunities in rice straw utilization through technological advancements is proposed, aiming for sustainable and environmentally friendly practices. The current study emphasizes the importance of further research, particularly in the exploration of industrial and commercial applications of rice straw, to maximize its potential as a valuable agricultural residue.</div></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"4 1","pages":"Article 100126"},"PeriodicalIF":0.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Carbon footprint impact of waste sorting on the municipal household waste treatment system: A community case study of Hangzhou 垃圾分类对城市生活垃圾处理系统的碳足迹影响：杭州社区案例研究

Circular Economy

Pub Date : 2024-12-01 Epub Date: 2024-10-20 DOI: 10.1016/j.cec.2024.100114

Jun Yin , Min Wang , Xiaoqin Yu , Meizhen Wang , Yanfeng Zhang , Ting Chen , Jianguo Liu

Considering the pressing need to reduce carbon emissions, the environmental impacts of waste sorting and its influencing factors remain unverified across many practical scenarios. This study focused on separating perishable and residual waste in a community in Hangzhou, China, examining how waste sorting behavior affects the carbon footprint of subsequent waste treatment systems through a randomized tracking survey and life cycle assessment (LCA) method. The results indicated that the sorted waste treatment system could achieve net carbon emissions ranging from −139.92 to −254.03 kg CO₂ eq per day by integrating the anaerobic digestion of sorted perishable waste with the incineration of residual waste. In comparison to the conventional mixed incineration system, which had net carbon emissions between −56.37 and −115.46 kg CO₂ eq per day and generated 383 kWh/t of power, the carbon reduction benefits of the sorted system were considerably greater, by a factor of 2.2–2.5. Additionally, the average amount of recovered electrical energy (993 kWh/t) was also higher by a factor of 2.6. Therefore, source separation of waste significantly enhances energy recovery and carbon reduction in household waste treatment systems. In this research system, incineration power generation and oil recovery serve as the primary units for reducing carbon emissions, and the proportion of residual waste generated greatly influences the total carbon emissions of the sorted waste treatment system (p < 0.05). Consequently, increasing the percentage of classified residual waste and optimizing machine efficiency will increase the carbon reduction benefits of waste sorting and treatment systems. These findings provide crucial references and guidance for advancing carbon reduction and waste classification in municipal solid waste (MSW) management systems.

考虑到减少碳排放的迫切需要，垃圾分类的环境影响及其影响因素在许多实际场景中仍未得到验证。本研究以中国杭州某社区的易腐垃圾和残余垃圾分类为重点，通过随机跟踪调查和生命周期评估（LCA）方法，研究垃圾分类行为如何影响后续垃圾处理系统的碳足迹。结果表明，通过将分类易腐垃圾的厌氧消化与残余垃圾的焚烧相结合，垃圾分类处理系统每天可实现-139.92 至-254.03 千克二氧化碳当量的净碳排放量。传统的混合焚烧系统每天的净碳排放量为-56.37 至-115.46 千克二氧化碳当量，发电量为 383 千瓦时/吨，相比之下，分类系统的减碳效益要高得多，达到 2.2-2.5 倍。此外，平均回收电能（993 千瓦时/吨）也高出 2.6 倍。因此，在生活垃圾处理系统中，垃圾源头分类可大大提高能源回收和碳减排效果。在该研究系统中，焚烧发电和油回收是减少碳排放的主要单元，而残余垃圾的产生比例在很大程度上影响着分类垃圾处理系统的总碳排放量（p <0.05）。因此，提高残余垃圾的分类比例和优化机器效率将增加垃圾分类处理系统的碳减排效益。这些研究结果为推进城市固体废物（MSW）管理系统中的碳减排和废物分类提供了重要的参考和指导。

{"title":"Carbon footprint impact of waste sorting on the municipal household waste treatment system: A community case study of Hangzhou","authors":"Jun Yin , Min Wang , Xiaoqin Yu , Meizhen Wang , Yanfeng Zhang , Ting Chen , Jianguo Liu","doi":"10.1016/j.cec.2024.100114","DOIUrl":"10.1016/j.cec.2024.100114","url":null,"abstract":"<div><div>Considering the pressing need to reduce carbon emissions, the environmental impacts of waste sorting and its influencing factors remain unverified across many practical scenarios. This study focused on separating perishable and residual waste in a community in Hangzhou, China, examining how waste sorting behavior affects the carbon footprint of subsequent waste treatment systems through a randomized tracking survey and life cycle assessment (LCA) method. The results indicated that the sorted waste treatment system could achieve net carbon emissions ranging from −139.92 to −254.03 kg CO<sub>2</sub> eq per day by integrating the anaerobic digestion of sorted perishable waste with the incineration of residual waste. In comparison to the conventional mixed incineration system, which had net carbon emissions between −56.37 and −115.46 kg CO<sub>2</sub> eq per day and generated 383 kWh/t of power, the carbon reduction benefits of the sorted system were considerably greater, by a factor of 2.2–2.5. Additionally, the average amount of recovered electrical energy (993 kWh/t) was also higher by a factor of 2.6. Therefore, source separation of waste significantly enhances energy recovery and carbon reduction in household waste treatment systems. In this research system, incineration power generation and oil recovery serve as the primary units for reducing carbon emissions, and the proportion of residual waste generated greatly influences the total carbon emissions of the sorted waste treatment system (p < 0.05). Consequently, increasing the percentage of classified residual waste and optimizing machine efficiency will increase the carbon reduction benefits of waste sorting and treatment systems. These findings provide crucial references and guidance for advancing carbon reduction and waste classification in municipal solid waste (MSW) management systems.</div></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"3 4","pages":"Article 100114"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142592577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microalgae as potential agents for biochar production: Future of industrial wastewater treatment 微藻作为生物炭生产的潜在媒介：工业废水处理的未来

Circular Economy

Pub Date : 2024-12-01 Epub Date: 2024-11-08 DOI: 10.1016/j.cec.2024.100117

Sayantani Ghosh , Sulagna Das , Avirup Panja , Alexei Solovchenko , Priyanka Jha

Diverse industries like breweries, textiles, paper & pulp, mining, chemical & nuclear, and food processing generate huge amounts of wastewater which can be toxic. This wastewater, rich in both organic compounds and inorganic salts, suspended solids, heavy metal ions and other pollutants should be properly treated before discharging into the environment. Recent studies demonstrated the efficiency of microalgae-based treatment. Microalgae are efficient in this regard since they produce photogenerated oxygen oxidizing the pollutants and toxin degrading enzymes, readily consume organics, and uptake/adsorb other pollutants. The current bottlenecks for microalgal bioremediation are high costs and low energy efficiency. The resulting biomass can be utilized for producing various forms of bioenergy via assorted traditional as well as modern techniques such as hydrothermal carbonization, pyrolysis, and torrefaction. One of the valuable outputs of these processes is biochar which is rich in nutrients and is capable of ion exchange. Therefore, it finds potential application in agriculture e.g., for revamping soil fertility and in wastewater treatment as adsorbent removing organic and inorganic pollutants. Here, we review novel processes designed for microalgae-based wastewater treatment with an emphasis on biochar production and utilization. Special attention is paid to the characterization of the physicochemical properties of biochar to maximize its targeted applications.

酿酒、纺织、造纸和纸浆、采矿、化学和核能以及食品加工等各种行业都会产生大量有毒废水。这些废水富含有机化合物、无机盐、悬浮固体、重金属离子和其他污染物，在排放到环境中之前应进行适当处理。最近的研究表明，基于微藻的处理方法非常有效。微藻在这方面非常有效，因为它们能产生氧化污染物的光生氧和降解毒素的酶，容易消耗有机物，并吸收/吸附其他污染物。目前，微藻生物修复的瓶颈在于成本高和能效低。由此产生的生物质可通过各种传统和现代技术用于生产各种形式的生物能源，如水热碳化、热解和高温分解。生物炭是这些工艺的宝贵产物之一，它富含营养物质，并能进行离子交换。因此，生物炭有可能应用于农业领域，如改善土壤肥力，以及在废水处理中作为吸附剂去除有机和无机污染物。在此，我们回顾了为基于微藻的废水处理而设计的新工艺，重点是生物炭的生产和利用。我们特别关注生物炭的物理化学特性，以最大限度地实现其目标应用。

{"title":"Microalgae as potential agents for biochar production: Future of industrial wastewater treatment","authors":"Sayantani Ghosh , Sulagna Das , Avirup Panja , Alexei Solovchenko , Priyanka Jha","doi":"10.1016/j.cec.2024.100117","DOIUrl":"10.1016/j.cec.2024.100117","url":null,"abstract":"<div><div>Diverse industries like breweries, textiles, paper & pulp, mining, chemical & nuclear, and food processing generate huge amounts of wastewater which can be toxic. This wastewater, rich in both organic compounds and inorganic salts, suspended solids, heavy metal ions and other pollutants should be properly treated before discharging into the environment. Recent studies demonstrated the efficiency of microalgae-based treatment. Microalgae are efficient in this regard since they produce photogenerated oxygen oxidizing the pollutants and toxin degrading enzymes, readily consume organics, and uptake/adsorb other pollutants. The current bottlenecks for microalgal bioremediation are high costs and low energy efficiency. The resulting biomass can be utilized for producing various forms of bioenergy via assorted traditional as well as modern techniques such as hydrothermal carbonization, pyrolysis, and torrefaction. One of the valuable outputs of these processes is biochar which is rich in nutrients and is capable of ion exchange. Therefore, it finds potential application in agriculture e.g., for revamping soil fertility and in wastewater treatment as adsorbent removing organic and inorganic pollutants. Here, we review novel processes designed for microalgae-based wastewater treatment with an emphasis on biochar production and utilization. Special attention is paid to the characterization of the physicochemical properties of biochar to maximize its targeted applications.</div></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"3 4","pages":"Article 100117"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142706100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Progress on the adsorption characteristics of nZVI and other iron-modified biochar for phosphate adsorption in water bodies nZVI 和其他铁改性生物炭在水体中吸附磷酸盐的吸附特性研究进展

Circular Economy

Pub Date : 2024-12-01 Epub Date: 2024-10-24 DOI: 10.1016/j.cec.2024.100112

Ruiqing Huang , Xuebin Lu , Wei Li , Jian Xiong , Jueyuan Yang

The issue of water body eutrophication induced by phosphorus is escalating, and there is an urgent need for materials that can control phosphate in water bodies. Biochar is often used as an adsorption material for phosphate removal from water bodies because of its high efficiency, strong stability, and low cost. However, the phosphate adsorption capacity of pristine biochar is limited, and iron and its compounds are often loaded to overcome this limitation and improve the adsorption effect. The current status of the use of nanoscale zero-valent iron (nZVI) and other iron-modified biochar in the treatment of eutrophic water is summarized. The preparation process of nanoscale zero-valent iron-modified biochar was introduced. The adsorption mechanism of nZVI and other iron-modified biochar in phosphorus removal from water was explained (mainly related to the roles of electrostatic, precipitation, complexation, ion exchange, etc.); the effects of factors such as dosage, pH value, and initial phosphate concentration on the adsorption of phosphate by iron-modified biochar were analyzed; and the possibility of reusing iron-modified biochar after adsorbing phosphate was pointed out. Based on the above research, the problems and future development directions of nZVI and other iron-modified biochars were proposed. This study provides a theoretical basis for the treatment of eutrophication in water bodies and the utilization of solid waste resources.

磷引起的水体富营养化问题日益严重，因此迫切需要能够控制水体中磷酸盐的材料。生物炭因其高效、稳定性强、成本低等优点，常被用作去除水体中磷酸盐的吸附材料。然而，原始生物炭的磷酸盐吸附能力有限，为了克服这一局限性并提高吸附效果，通常会添加铁及其化合物。本文总结了纳米级零价铁（nZVI）和其他铁改性生物炭在富营养化水处理中的应用现状。介绍了纳米级零价铁改性生物炭的制备过程。解释了 nZVI 等铁改性生物炭在水中除磷的吸附机理（主要涉及静电、沉淀、络合、离子交换等作用）；分析了投加量、pH 值、初始磷酸盐浓度等因素对铁改性生物炭吸附磷酸盐的影响；指出了铁改性生物炭吸附磷酸盐后再利用的可能性。在上述研究的基础上，提出了 nZVI 和其他铁改性生物炭存在的问题和未来的发展方向。该研究为水体富营养化治理和固体废弃物资源化利用提供了理论依据。

{"title":"Progress on the adsorption characteristics of nZVI and other iron-modified biochar for phosphate adsorption in water bodies","authors":"Ruiqing Huang , Xuebin Lu , Wei Li , Jian Xiong , Jueyuan Yang","doi":"10.1016/j.cec.2024.100112","DOIUrl":"10.1016/j.cec.2024.100112","url":null,"abstract":"<div><div>The issue of water body eutrophication induced by phosphorus is escalating, and there is an urgent need for materials that can control phosphate in water bodies. Biochar is often used as an adsorption material for phosphate removal from water bodies because of its high efficiency, strong stability, and low cost. However, the phosphate adsorption capacity of pristine biochar is limited, and iron and its compounds are often loaded to overcome this limitation and improve the adsorption effect. The current status of the use of nanoscale zero-valent iron (nZVI) and other iron-modified biochar in the treatment of eutrophic water is summarized. The preparation process of nanoscale zero-valent iron-modified biochar was introduced. The adsorption mechanism of nZVI and other iron-modified biochar in phosphorus removal from water was explained (mainly related to the roles of electrostatic, precipitation, complexation, ion exchange, etc.); the effects of factors such as dosage, pH value, and initial phosphate concentration on the adsorption of phosphate by iron-modified biochar were analyzed; and the possibility of reusing iron-modified biochar after adsorbing phosphate was pointed out. Based on the above research, the problems and future development directions of nZVI and other iron-modified biochars were proposed. This study provides a theoretical basis for the treatment of eutrophication in water bodies and the utilization of solid waste resources.</div></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"3 4","pages":"Article 100112"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Using solid waste from the leather tanning industry to produce a mixed calcium/zinc thermal stabilizer for polyvinyl chloride 利用制革业产生的固体废物生产聚氯乙烯钙锌混合热稳定剂

Circular Economy

Pub Date : 2024-12-01 Epub Date: 2024-10-23 DOI: 10.1016/j.cec.2024.100115

I Dewa Gede Arsa Putrawan, Shifa Mardiani, Vita Wonoputri

The leather tanning industry has historically posed considerable environmental challenges owing to the substantial solid waste it produces. This study examines innovative uses for the solid waste generated by this sector, focusing on the waste from the fleshing process. Our research involved extracting fat from fleshing waste, synthesizing Ca and Zn carboxylates from the extracted fat, and assessing their effectiveness as a combined Ca/Zn thermal stabilizer for polyvinyl chloride (PVC). The synthesized Ca and Zn carboxylates contained 6.4% Ca and 11.4% Zn, respectively, while the total fatty matter was determined to be 86.2% and 88.5%, respectively. Thermal analysis indicated that both carboxylates remained stable up to 200 °C. Tests on dehydrochlorination and roll milling revealed that the mixed Ca/Zn thermal stabilizer effectively improved the thermal stability of PVC resin. It also showed a synergistic effect when combined with pentaerythritol, enhancing its overall efficacy. The synthesized mixed Ca/Zn thermal stabilizer exhibited thermal stabilizing properties and flowability comparable to those of mixed Ca/Zn stearate, a widely used thermal stabilizer for PVC. These results suggest that fleshing fat could serve as a valuable raw material in the production of mixed Ca/Zn-based PVC thermal stabilizers.

由于制革业会产生大量固体废物，因此该行业一直以来都面临着巨大的环境挑战。本研究探讨了该行业产生的固体废弃物的创新用途，重点是制革过程中产生的废弃物。我们的研究包括从制肉废料中提取脂肪，从提取的脂肪中合成钙和锌羧酸盐，并评估它们作为聚氯乙烯（PVC）的钙/锌组合热稳定剂的有效性。合成的钙锌羧酸盐分别含有 6.4% 的钙和 11.4% 的锌，而总脂肪含量分别为 86.2% 和 88.5%。热分析表明，这两种羧酸盐在 200 °C 以下仍保持稳定。脱氢氯化和轧制试验表明，钙锌混合热稳定剂能有效提高聚氯乙烯树脂的热稳定性。当它与季戊四醇结合使用时，还能产生协同效应，增强其整体功效。合成的 Ca/Zn 混合热稳定剂的热稳定性能和流动性与广泛用于聚氯乙烯的硬脂酸 Ca/Zn 混合热稳定剂相当。这些结果表明，肉脂可作为生产钙锌混合型聚氯乙烯热稳定剂的重要原料。

{"title":"Using solid waste from the leather tanning industry to produce a mixed calcium/zinc thermal stabilizer for polyvinyl chloride","authors":"I Dewa Gede Arsa Putrawan, Shifa Mardiani, Vita Wonoputri","doi":"10.1016/j.cec.2024.100115","DOIUrl":"10.1016/j.cec.2024.100115","url":null,"abstract":"<div><div>The leather tanning industry has historically posed considerable environmental challenges owing to the substantial solid waste it produces. This study examines innovative uses for the solid waste generated by this sector, focusing on the waste from the fleshing process. Our research involved extracting fat from fleshing waste, synthesizing Ca and Zn carboxylates from the extracted fat, and assessing their effectiveness as a combined Ca/Zn thermal stabilizer for polyvinyl chloride (PVC). The synthesized Ca and Zn carboxylates contained 6.4% Ca and 11.4% Zn, respectively, while the total fatty matter was determined to be 86.2% and 88.5%, respectively. Thermal analysis indicated that both carboxylates remained stable up to 200 °C. Tests on dehydrochlorination and roll milling revealed that the mixed Ca/Zn thermal stabilizer effectively improved the thermal stability of PVC resin. It also showed a synergistic effect when combined with pentaerythritol, enhancing its overall efficacy. The synthesized mixed Ca/Zn thermal stabilizer exhibited thermal stabilizing properties and flowability comparable to those of mixed Ca/Zn stearate, a widely used thermal stabilizer for PVC. These results suggest that fleshing fat could serve as a valuable raw material in the production of mixed Ca/Zn-based PVC thermal stabilizers.</div></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"3 4","pages":"Article 100115"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Process optimization and economic estimation of nitric acid dissolution for recycling waste wind blades 回收废旧风力叶片的硝酸溶解工艺优化和经济估算

Circular Economy

Pub Date : 2024-12-01 Epub Date: 2024-10-19 DOI: 10.1016/j.cec.2024.100113

Muqian Guo, Zhe Yuan, Xingnan Zhang, Ying Li

With the widespread retirement of wind turbines, many discarded waste wind blades have been generated, and how to handle them efficiently has become a critical issue. This study investigated the dissolution of discarded waste wind blades with nitric acid (HNO₃) by varying acid concentration, reaction time, temperature, and HNO₃ volume. Based on a series of single-factor experiments, the optimal conditions for low energy and acid consumption were determined, and the separation rate of resin reached 95%. As the cost-benefit analysis results suggested, an economic method to recycle a variety of high-value products was achieved. Furthermore, the implementation of a continuous chemical decomposition strategy for multi-batch processing significantly minimized acid consumption, resulting in a further reduction in recycling costs. This work provided an economically and technologically feasible way for recycling materials from decommissioned wind turbines, in order to answer the challenge of emerging solid waste management.

随着风力涡轮机的广泛退役，产生了许多废弃风叶，如何有效处理这些废弃风叶已成为一个关键问题。本研究通过改变酸浓度、反应时间、温度和 HNO3 体积，研究了废弃风力叶片与硝酸（HNO3）的溶解问题。在一系列单因素实验的基础上，确定了低能耗和低酸耗的最佳条件，树脂分离率达到 95%。成本效益分析结果表明，该方法是回收多种高价值产品的经济方法。此外，采用连续化学分解策略进行多批次处理大大降低了酸消耗，从而进一步降低了回收成本。这项工作为从退役风力涡轮机中回收材料提供了一种经济上和技术上可行的方法，以应对新出现的固体废物管理挑战。

引用次数: 0

Formulating efficient P-rich biobased starter fertilizers: Effects of acidification and pelletizing on fertilizer properties 配制高效的富含 P 的生物基起始肥料：酸化和造粒对肥料特性的影响

Circular Economy

Pub Date : 2024-12-01 Epub Date: 2024-10-19 DOI: 10.1016/j.cec.2024.100111

Pietro Sica , Dorette Müller-Stöver , Jakob Magid

Animal-derived biowastes can be alternatives to mineral phosphorus fertilizers. However, they typically have lower efficiency and higher transport costs because of their low bulk density. Pelleting can reduce their volume and facilitate their use as placement fertilizers but may also decrease phosphorus availability. This study examined how acidification and pelletizing affect phosphorus availability in biowastes. Digestate solid fraction and meat and bone meal were treated in four ways: (1) untreated (U), (2) acidified (A), (3) untreated pelletized (UP), and (4) acidified pelletized (AP). These treatments were tested in soil incubation and pea growth experiments, with fertilizers placed 5 cm beneath the seeds to evaluate their effectiveness as placement fertilizers. Acidification significantly enhanced the phosphorus solubility of DSF and MBM by approximately 5 and 7 times respectively, while pelletizing acidified materials reduced it. In the incubation experiment, acidified materials in the powdery form showed the highest soil water-extractable phosphorus, with no significant differences among U, UP, and AP ways. In the rhizobox experiment, pelletizing untreated digestate significantly reduced plant dry matter compared to the untreated fibrous form (from 2.0 g to 1.35 g). Acidified and acidified pelletized digestate treatments resulted in the highest shoot dry matter (2.8 g and 2.95 g, respectively), surpassing even triple the amount of superphosphate (2.53 g). For meat and bone meal, the acidified powder led to the highest plant growth (2.0 g), while untreated powder resulted in the lowest amount of plant growth (0.4 g), which was lower than that of the negative control (0.6 g). No significant differences were noted between untreated and acidified pellets. These findings indicate that acidification enhances phosphorus availability in biowastes, while pelletizing reduces it. The acidified pelletized digestate solid fraction has lower volume and higher P use efficiency than its untreated material, showing higher plant growth when compared to mineral P fertilizer.

动物产生的生物废料可以作为矿物磷肥的替代品。不过，由于体积密度较低，它们通常效率较低，运输成本较高。造粒可以减少它们的体积，便于将其用作投放肥料，但也可能降低磷的可用性。本研究探讨了酸化和造粒如何影响生物废料中磷的可用性。沼渣固体部分和肉骨粉有四种处理方法：(1) 未经处理 (U)，(2) 酸化 (A)，(3) 未经处理造粒 (UP) 和 (4) 酸化造粒 (AP)。这些处理方法在土壤培养和豌豆生长实验中进行了测试，肥料放置在种子下方 5 厘米处，以评估其作为放置肥料的效果。酸化可大大提高 DSF 和 MBM 的磷溶解度，分别提高了约 5 倍和 7 倍，而酸化材料造粒则降低了磷溶解度。在培养实验中，粉状酸化材料显示出最高的土壤水提取磷，而 U、UP 和 AP 三种方式之间没有显著差异。在根瘤菌箱实验中，与未经处理的纤维状沼渣相比，未经处理的沼渣造粒会显著减少植物干物质（从 2.0 克减少到 1.35 克）。酸化和酸化造粒沼渣处理的芽干物质最高（分别为 2.8 克和 2.95 克），甚至超过过磷酸钙（2.53 克）的三倍。就肉骨粉而言，酸化粉末导致的植物生长量最高（2.0 克），而未经处理的粉末导致的植物生长量最低（0.4 克），低于阴性对照（0.6 克）。未经处理的颗粒和酸化颗粒之间没有明显差异。这些研究结果表明，酸化可提高生物废料中磷的可用性，而造粒则会降低磷的可用性。与未经处理的材料相比，酸化造粒后的沼渣固体部分体积更小，磷的利用效率更高，与矿物磷肥相比，植物生长速度更快。

{"title":"Formulating efficient P-rich biobased starter fertilizers: Effects of acidification and pelletizing on fertilizer properties","authors":"Pietro Sica , Dorette Müller-Stöver , Jakob Magid","doi":"10.1016/j.cec.2024.100111","DOIUrl":"10.1016/j.cec.2024.100111","url":null,"abstract":"<div><div>Animal-derived biowastes can be alternatives to mineral phosphorus fertilizers. However, they typically have lower efficiency and higher transport costs because of their low bulk density. Pelleting can reduce their volume and facilitate their use as placement fertilizers but may also decrease phosphorus availability. This study examined how acidification and pelletizing affect phosphorus availability in biowastes. Digestate solid fraction and meat and bone meal were treated in four ways: (1) untreated (U), (2) acidified (A), (3) untreated pelletized (UP), and (4) acidified pelletized (AP). These treatments were tested in soil incubation and pea growth experiments, with fertilizers placed 5 cm beneath the seeds to evaluate their effectiveness as placement fertilizers. Acidification significantly enhanced the phosphorus solubility of DSF and MBM by approximately 5 and 7 times respectively, while pelletizing acidified materials reduced it. In the incubation experiment, acidified materials in the powdery form showed the highest soil water-extractable phosphorus, with no significant differences among U, UP, and AP ways. In the rhizobox experiment, pelletizing untreated digestate significantly reduced plant dry matter compared to the untreated fibrous form (from 2.0 g to 1.35 g). Acidified and acidified pelletized digestate treatments resulted in the highest shoot dry matter (2.8 g and 2.95 g, respectively), surpassing even triple the amount of superphosphate (2.53 g). For meat and bone meal, the acidified powder led to the highest plant growth (2.0 g), while untreated powder resulted in the lowest amount of plant growth (0.4 g), which was lower than that of the negative control (0.6 g). No significant differences were noted between untreated and acidified pellets. These findings indicate that acidification enhances phosphorus availability in biowastes, while pelletizing reduces it. The acidified pelletized digestate solid fraction has lower volume and higher P use efficiency than its untreated material, showing higher plant growth when compared to mineral P fertilizer.</div></div>","PeriodicalId":100245,"journal":{"name":"Circular Economy","volume":"3 4","pages":"Article 100111"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142530568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0