Waste management最新文献_第3页

Promoting effect of ammonia oxidation on sulfur oxidation during composting: Nitrate as a bridge 堆肥过程中氨氧化对硫氧化的促进作用：硝酸盐作为桥梁

IF 7.1 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Waste management

Pub Date : 2024-11-05 DOI: 10.1016/j.wasman.2024.10.032

Lingxiao Wang, Zhiping Ren, Zhao Xu, Lixin Liu, Ruixue Chang, Yanming Li

Ammonia (NH₃) and hydrogen sulfide (H₂S) are the main odor components in the composting process. Controlling their emissions is very important to reduce environmental pollution and improve the quality of composting products. This study explored the effects of functional bacteria on nitrogen and sulfur metabolism in the composting process of food waste (FW) by adding ammonia-oxidizing bacteria (AOB, A treatment), sulfur-oxidizing bacteria (SOB, S treatment), and combined AOB and SOB (AS treatment), respectively. The key bacterial species involved in nitrogen and sulfur transformation were identified, and the intrinsic mechanisms by which ammonia oxidation drove sulfur oxidation during composting were deciphered. Compared with control treatment (CK), the combined addition of functional microorganisms increased the maximum of soxB gene abundance by 1.72 times, thus resulting in the increase in the SO₄^2- content by 44.00 %. AS treatment decreased the cumulative H₂S emission and total sulfur (TS) loss by 40.24 % and 34.69 %, respectively, meanwhile lowering NH₃ emission. Correlation network analysis showed that the simultaneous addition of AOB and SOB enhanced the correlation between microorganisms and sulfur oxidation genes, and Acinetobacter, Aeribacillus, Brevibacterium and Ureibacillus might be involved in the ammonia oxidation-promoted sulfur oxidation process. In summary, the optimized inoculation strategy of AOB and SOB could drive biological transformation of nitrogen and sulfur by regulating microbial community, ultimately reducing odor emissions and improving sulfur conservation.

氨（NH3）和硫化氢（H2S）是堆肥过程中的主要臭味成分。控制它们的排放对减少环境污染和提高堆肥产品质量非常重要。本研究通过添加氨氧化细菌（AOB，A 处理）、硫氧化细菌（SOB，S 处理）以及 AOB 和 SOB 混合菌（AS 处理），分别探讨了功能细菌对厨余垃圾（FW）堆肥过程中氮、硫代谢的影响。确定了参与氮和硫转化的关键细菌种类，并破译了堆肥过程中氨氧化推动硫氧化的内在机制。与对照处理（CK）相比，联合添加功能微生物使soxB基因丰度最大值增加了1.72倍，从而使SO42-含量增加了44.00%。AS 处理使 H2S 排放量和总硫（TS）损失量分别减少了 40.24 % 和 34.69 %，同时降低了 NH3 排放量。相关网络分析表明，同时添加 AOB 和 SOB 增强了微生物与硫氧化基因之间的相关性，不动杆菌、气杆菌、布氏杆菌和尿杆菌可能参与了氨氧化促进硫氧化的过程。总之，AOB 和 SOB 的优化接种策略可通过调节微生物群落来推动氮和硫的生物转化，最终减少臭气排放并提高硫的保存率。

{"title":"Promoting effect of ammonia oxidation on sulfur oxidation during composting: Nitrate as a bridge","authors":"Lingxiao Wang, Zhiping Ren, Zhao Xu, Lixin Liu, Ruixue Chang, Yanming Li","doi":"10.1016/j.wasman.2024.10.032","DOIUrl":"10.1016/j.wasman.2024.10.032","url":null,"abstract":"<div><div>Ammonia (NH<sub>3</sub>) and hydrogen sulfide (H<sub>2</sub>S) are the main odor components in the composting process. Controlling their emissions is very important to reduce environmental pollution and improve the quality of composting products. This study explored the effects of functional bacteria on nitrogen and sulfur metabolism in the composting process of food waste (FW) by adding ammonia-oxidizing bacteria (AOB, A treatment), sulfur-oxidizing bacteria (SOB, S treatment), and combined AOB and SOB (AS treatment), respectively. The key bacterial species involved in nitrogen and sulfur transformation were identified, and the intrinsic mechanisms by which ammonia oxidation drove sulfur oxidation during composting were deciphered. Compared with control treatment (CK), the combined addition of functional microorganisms increased the maximum of <em>soxB</em> gene abundance by 1.72 times, thus resulting in the increase in the SO<sub>4</sub><sup>2-</sup> content by 44.00 %. AS treatment decreased the cumulative H<sub>2</sub>S emission and total sulfur (TS) loss by 40.24 % and 34.69 %, respectively, meanwhile lowering NH<sub>3</sub> emission. Correlation network analysis showed that the simultaneous addition of AOB and SOB enhanced the correlation between microorganisms and sulfur oxidation genes, and <em>Acinetobacter</em>, <em>Aeribacillus</em>, <em>Brevibacterium</em> and <em>Ureibacillus</em> might be involved in the ammonia oxidation-promoted sulfur oxidation process. In summary, the optimized inoculation strategy of AOB and SOB could drive biological transformation of nitrogen and sulfur by regulating microbial community, ultimately reducing odor emissions and improving sulfur conservation.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"191 ","pages":"Pages 13-22"},"PeriodicalIF":7.1,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis, characterization, and efficacy of alkali-activated materials from mine tailings: A review 从矿山尾矿中提取的碱活性材料的合成、特征和功效：综述。

IF 7.1 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Waste management

Pub Date : 2024-11-05 DOI: 10.1016/j.wasman.2024.10.036

Adeyemi Adesina

Annually, over 5 billion metric tons of tailings are produced worldwide as byproducts of mining processes, posing significant environmental risks due to their potential to pollute and disrupt ecosystems. Concurrently, the production of portland cement (PC), the primary binder in cementitious materials is a major contributor to global anthropogenic carbon dioxide emissions. With the escalating demand for PC, a corresponding surge in carbon emissions is inevitable. Alkali-activated materials (AAMs) present a greener alternative to PC, given their production primarily utilizes industrial wastes. Traditional precursors for AAMs, such as fly ash and slag, however, are not universally available—Canada, for instance, faces a scarcity of fly ash for AAM production. In response to the dual challenges of managing mine tailings and reducing PC’s environmental footprint, this review proposes the innovative use of mine tailings as an alternative binder to PC. This paper offers a thorough examination of mine tailings’ properties, methodologies to enhance their suitability for AAM synthesis, and an analysis of AAMs produced from diverse tailing sources. Additionally, this paper explores the associated challenges and future prospects, providing a rounded overview of this promising avenue in sustainable construction materials.

作为采矿过程中的副产品，全世界每年产生的尾矿超过 50 亿吨，由于其可能污染和破坏生态系统，因此对环境构成了巨大的风险。同时，作为胶凝材料主要粘结剂的硅酸盐水泥（PC）的生产也是全球人为二氧化碳排放的主要来源。随着对 PC 需求的不断增长，碳排放量也不可避免地相应激增。碱活性材料（AAMs）主要利用工业废料生产，是 PC 的绿色替代品。然而，粉煤灰和矿渣等传统的碱活性材料前体并非普遍可用，例如加拿大就面临着生产碱活性材料所需的粉煤灰匮乏的问题。为了应对管理矿山尾矿和减少 PC 对环境影响的双重挑战，本综述提出创新性地使用矿山尾矿作为 PC 的替代粘结剂。本文深入探讨了矿山尾矿的特性、提高其合成 AAM 适用性的方法，以及对不同尾矿来源生产的 AAM 的分析。此外，本文还探讨了相关的挑战和未来前景，全面概述了可持续建筑材料的这一前景广阔的途径。

{"title":"Synthesis, characterization, and efficacy of alkali-activated materials from mine tailings: A review","authors":"Adeyemi Adesina","doi":"10.1016/j.wasman.2024.10.036","DOIUrl":"10.1016/j.wasman.2024.10.036","url":null,"abstract":"<div><div>Annually, over 5 billion metric tons of tailings are produced worldwide as byproducts of mining processes, posing significant environmental risks due to their potential to pollute and disrupt ecosystems. Concurrently, the production of portland cement (PC), the primary binder in cementitious materials is a major contributor to global anthropogenic carbon dioxide emissions. With the escalating demand for PC, a corresponding surge in carbon emissions is inevitable. Alkali-activated materials (AAMs) present a greener alternative to PC, given their production primarily utilizes industrial wastes. Traditional precursors for AAMs, such as fly ash and slag, however, are not universally available—Canada, for instance, faces a scarcity of fly ash for AAM production. In response to the dual challenges of managing mine tailings and reducing PC’s environmental footprint, this review proposes the innovative use of mine tailings as an alternative binder to PC. This paper offers a thorough examination of mine tailings’ properties, methodologies to enhance their suitability for AAM synthesis, and an analysis of AAMs produced from diverse tailing sources. Additionally, this paper explores the associated challenges and future prospects, providing a rounded overview of this promising avenue in sustainable construction materials.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"191 ","pages":"Pages 23-46"},"PeriodicalIF":7.1,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142589254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel acid-free combined technology to achieve the full recovery of crystalline silicon photovoltaic waste 实现晶体硅光伏废料完全回收的新型无酸组合技术

IF 7.1 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Waste management

Pub Date : 2024-11-04 DOI: 10.1016/j.wasman.2024.10.031

Mi Lin, Pengcheng Wang, Baojia Qin, Jujun Ruan

To achieve the global carbon neutrality commitment, photovoltaics, a clean and renewable source of energy, is increasingly deployed. Photovoltaic panels are core components of photovoltaic systems. As these panels reach the end of their life, recovering the photovoltaic waste becomes crucial. Currently, strong acid reagents are commonly used in the recovery of silver from crystalline silicon photovoltaic waste, posing environmental risks and restricting the industrialization of their recycling. In this study, a novel acid-free technology to achieve the full recovery of crystalline silicon photovoltaic waste was proposed. A pyrolysis process was first conducted for decapsulation, with carbon dioxide being the main gas component at 60.64 %. Next, bioleaching technology was employed to leach silver from waste crystalline silicon photovoltaic cells. The silver leaching rate in a single leaching cycle reached 44.7 %. Meanwhile, the mechanism of silver leaching was further analyzed. Finally, high-velocity fluid frictional separation, a technique that uses high-speed fluid flow to separate material, was chosen to obtain silicon wafers. The reclaimed silicon samples had a total thickness variation of 6.64 µm to11.62 µm, with average carrier lifetimes exceeding 4.9 µs, higher than that obtained by wet etching. This study is expected to advance the industrialization of the recovery of photovoltaic waste, which is also beneficial for the sustainable development of the photovoltaic supply chain.

为实现全球碳中和承诺，光伏这一清洁的可再生能源正得到越来越多的应用。光伏板是光伏系统的核心部件。随着这些电池板使用寿命的结束，回收光伏废料变得至关重要。目前，从晶体硅光伏废料中回收银通常使用强酸试剂，不仅存在环境风险，还限制了其回收利用的产业化。本研究提出了一种新型无酸技术，以实现晶体硅光伏废料的全面回收。首先采用热解工艺进行脱胶，主要气体成分为二氧化碳，占 60.64%。接着，采用生物浸出技术从废弃晶体硅光伏电池中浸出银。在单次浸出循环中，银的浸出率达到 44.7%。同时，还进一步分析了银的浸出机理。最后，选择了高速流体摩擦分离技术（一种利用高速流体流动分离材料的技术）来获得硅片。回收的硅样品总厚度变化范围为 6.64 µm 至 11.62 µm，平均载流子寿命超过 4.9 µs，高于湿法蚀刻获得的平均载流子寿命。这项研究有望推动光伏废料回收的产业化，也有利于光伏供应链的可持续发展。

{"title":"A novel acid-free combined technology to achieve the full recovery of crystalline silicon photovoltaic waste","authors":"Mi Lin, Pengcheng Wang, Baojia Qin, Jujun Ruan","doi":"10.1016/j.wasman.2024.10.031","DOIUrl":"10.1016/j.wasman.2024.10.031","url":null,"abstract":"<div><div>To achieve the global carbon neutrality commitment, photovoltaics, a clean and renewable source of energy, is increasingly deployed. Photovoltaic panels are core components of photovoltaic systems. As these panels reach the end of their life, recovering the photovoltaic waste becomes crucial. Currently, strong acid reagents are commonly used in the recovery of silver from crystalline silicon photovoltaic waste, posing environmental risks and restricting the industrialization of their recycling. In this study, a novel acid-free technology to achieve the full recovery of crystalline silicon photovoltaic waste was proposed. A pyrolysis process was first conducted for decapsulation, with carbon dioxide being the main gas component at 60.64 %. Next, bioleaching technology was employed to leach silver from waste crystalline silicon photovoltaic cells. The silver leaching rate in a single leaching cycle reached 44.7 %. Meanwhile, the mechanism of silver leaching was further analyzed. Finally, high-velocity fluid frictional separation, a technique that uses high-speed fluid flow to separate material, was chosen to obtain silicon wafers. The reclaimed silicon samples had a total thickness variation of 6.64 µm to11.62 µm, with average carrier lifetimes exceeding 4.9 µs, higher than that obtained by wet etching. This study is expected to advance the industrialization of the recovery of photovoltaic waste, which is also beneficial for the sustainable development of the photovoltaic supply chain.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"190 ","pages":"Pages 666-675"},"PeriodicalIF":7.1,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142577977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Disintegration of certified compostable plastic bags in outdoor household composting conditions 经认证的可堆肥塑料袋在室外家用堆肥条件下的分解情况

IF 7.1 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Waste management

Pub Date : 2024-11-04 DOI: 10.1016/j.wasman.2024.10.028

Emily Bryson , Lisa Bricknell , Ryan Kift , Amie Anastasi

Picking up dog faeces with single use plastic bags and disposing in landfill is a common practice which ultimately harms the environment. Compostable plastic dog waste bags may help to divert these wastes from landfill and recover dog faeces as a compost feedstock, though little is known about how certified home compostable plastics behave in real world home compost systems. This study investigated the disintegration of commercially available certified home compostable plastic bags in outdoor home composts containing dog faeces. Two pilot trials (25 L) and one household trial (160 L) were conducted over 7, 15, and 9.5 months, respectively. Thermophilic temperatures were reached in all trials while moisture and pH were within optimal ranges for well managed compost systems. Bags showed statistically significant differences in disintegration. Based on final mass, none of the tested bags met the Australian Standard AS5810 minimum disintegration requirements of 90 % mass loss of plastic fragments >2 mm, with average mass change of certified home compostable bags ranging from +1.51 to −81.28 %. All certified industrial compostable bags showed an average mass increase of 10.90–35.04 % during composting. However, time series images of plastic fragmentation indicated some bags fully disintegrated and revealed residual biofilm that may have affected mass change data. Microplastic fragments < 2 mm and macroplastic fragments >5 mm were recovered in all composts. Due to the potential risks of using home compost contaminated with microplastics in household gardens, dog owners should avoid including compostable plastic bags in their home composts.

用一次性塑料袋捡拾狗粪并丢弃到垃圾填埋场是一种常见的做法，最终会对环境造成危害。可堆肥的塑料狗粪袋有助于将这些垃圾从垃圾填埋场转移出来，并将狗粪作为堆肥原料进行回收，但人们对经过认证的家用可堆肥塑料在实际家用堆肥系统中的表现知之甚少。本研究调查了市售认证家用可堆肥塑料袋在含有狗粪的室外家用堆肥中的分解情况。两项试点试验（25 升）和一项家庭试验（160 升）分别进行了 7 个月、15 个月和 9.5 个月。所有试验都达到了嗜热温度，而水分和 pH 值都在管理良好的堆肥系统的最佳范围内。从统计学角度看，袋子在分解方面存在显著差异。根据最终质量，没有一个测试袋达到澳大利亚标准 AS5810 规定的最低解体要求，即 2 毫米塑料碎片的质量损失率为 90%，经认证的家用可堆肥袋的平均质量变化范围为 +1.51% 到 -81.28%。所有经过认证的工业堆肥袋在堆肥过程中的平均质量增加了 10.90%-35.04%。然而，塑料碎片的时间序列图像显示，一些袋子完全解体，并显示出残留的生物膜，这可能会影响质量变化数据。在所有堆肥中都回收到了 2 毫米的微塑料碎片和 5 毫米的大塑料碎片。由于在家庭花园中使用被微塑料污染的家庭堆肥存在潜在风险，养狗者应避免在家庭堆肥中使用可堆肥塑料袋。

{"title":"Disintegration of certified compostable plastic bags in outdoor household composting conditions","authors":"Emily Bryson , Lisa Bricknell , Ryan Kift , Amie Anastasi","doi":"10.1016/j.wasman.2024.10.028","DOIUrl":"10.1016/j.wasman.2024.10.028","url":null,"abstract":"<div><div>Picking up dog faeces with single use plastic bags and disposing in landfill is a common practice which ultimately harms the environment. Compostable plastic dog waste bags may help to divert these wastes from landfill and recover dog faeces as a compost feedstock, though little is known about how certified home compostable plastics behave in real world home compost systems. This study investigated the disintegration of commercially available certified home compostable plastic bags in outdoor home composts containing dog faeces. Two pilot trials (25 L) and one household trial (160 L) were conducted over 7, 15, and 9.5 months, respectively. Thermophilic temperatures were reached in all trials while moisture and pH were within optimal ranges for well managed compost systems. Bags showed statistically significant differences in disintegration. Based on final mass, none of the tested bags met the Australian Standard AS5810 minimum disintegration requirements of 90 % mass loss of plastic fragments >2 mm, with average mass change of certified home compostable bags ranging from +1.51 to −81.28 %. All certified industrial compostable bags showed an average mass increase of 10.90–35.04 % during composting. However, time series images of plastic fragmentation indicated some bags fully disintegrated and revealed residual biofilm that may have affected mass change data. Microplastic fragments < 2mm and macroplastic fragments >5 mm were recovered in all composts. Due to the potential risks of using home compost contaminated with microplastics in household gardens, dog owners should avoid including compostable plastic bags in their home composts.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"190 ","pages":"Pages 654-665"},"PeriodicalIF":7.1,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142577979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamic ammonium retention for nutrient separation from manure digestate 从粪便沼渣中分离养分的动态氨截留法

IF 7.1 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Waste management

Pub Date : 2024-11-04 DOI: 10.1016/j.wasman.2024.10.034

Marrit van der Wal, Joep van Alphen, Kitty Nijmeijer, Zandrie Borneman

Extensive nitrogen emissions with negative impact on nature and the environment urge effective valorization of manure and fractionation of nutrients to enable precision fertilization. Typically, manure is fed to a digester to produce biogas. The remaining digestate is then mechanically separated into a solid phosphorous-rich fraction and a liquid fraction containing both NH₄⁺ and K. These ions are difficult to separate due to their very identical size and charge. We show that with smart tuning of the pH to control the NH₃/NH₄⁺ equilibrium, membranes can produce dedicated N and K-rich streams. The increased pH switches the equilibrium towards the neutrally charged solute NH₃ that permeates more easily through the membrane than charged NH₄⁺ and K⁺ ions. Experiments with both artificial NH₄Cl/KCl mixtures as well as real liquid digestate and four different membrane types, ranging from open nanofiltration (NF) to sea water reverse osmosis (RO) membranes were performed. At neutral pH, no N/K selectivity was observed, not for single components nor for mixtures. When the pH was increased towards alkaline environment, distinct selectivity for N/K was obtained both with model solutions and real liquid digestate. At a suitable pH of 10, with >80 % of the total ammonia present as NH₃, the RO BW membrane showed a large N/K selectivity of 35 in the crossflow system. Additional RO steps at low pH allows subsequent concentration of the formed NH₄⁺ and K⁺ fractions. The presented dynamic pH approach proofs that in a two-step RO system both N, and K-enriched fertilizers can be produced from real liquid digestate.

大量的氮排放会对自然和环境造成负面影响，因此需要对粪便进行有效的价值评估和养分分馏，以实现精准施肥。通常，粪便被送入沼气池产生沼气。剩余的沼渣通过机械分离成富含磷的固体部分和同时含有 NH4+ 和 K 的液体部分。我们的研究表明，通过巧妙地调节 pH 值来控制 NH3/NH4+ 的平衡，膜可以产生专用的富含 N 和 K 的液流。pH 值的升高会使平衡转向带中性电荷的溶质 NH3，它比带电荷的 NH4+ 和 K+ 离子更容易透过膜。实验中使用了人工 NH4Cl/KCl 混合物以及真正的液态沼渣和四种不同类型的膜，包括开放式纳滤（NF）膜和海水反渗透（RO）膜。在中性 pH 值下，无论是单一成分还是混合物，都没有观察到 N/K 选择性。当 pH 值升高到碱性环境时，模型溶液和实际液体消化物对 N/K 都有明显的选择性。在合适的 pH 值为 10 时，氨总量的 80% 以 NH3 形式存在，反渗透 BW 膜在横流系统中对 N/K 的选择性高达 35。在低 pH 值条件下进行额外的反渗透步骤，可以对形成的 NH4+ 和 K+ 部分进行后续浓缩。所介绍的动态 pH 值方法证明，在两步反渗透系统中，可以从真正的液态沼渣中生产出富含 N 和 K 的肥料。

{"title":"Dynamic ammonium retention for nutrient separation from manure digestate","authors":"Marrit van der Wal, Joep van Alphen, Kitty Nijmeijer, Zandrie Borneman","doi":"10.1016/j.wasman.2024.10.034","DOIUrl":"10.1016/j.wasman.2024.10.034","url":null,"abstract":"<div><div>Extensive nitrogen emissions with negative impact on nature and the environment urge effective valorization of manure and fractionation of nutrients to enable precision fertilization. Typically, manure is fed to a digester to produce biogas. The remaining digestate is then mechanically separated into a solid phosphorous-rich fraction and a liquid fraction containing both NH<sub>4</sub><sup>+</sup> and K. These ions are difficult to separate due to their very identical size and charge. We show that with smart tuning of the pH to control the NH<sub>3</sub>/NH<sub>4</sub><sup>+</sup> equilibrium, membranes can produce dedicated N and K-rich streams. The increased pH switches the equilibrium towards the neutrally charged solute NH<sub>3</sub> that permeates more easily through the membrane than charged NH<sub>4</sub><sup>+</sup> and K<sup>+</sup> ions. Experiments with both artificial NH<sub>4</sub>Cl/KCl mixtures as well as real liquid digestate and four different membrane types, ranging from open nanofiltration (NF) to sea water reverse osmosis (RO) membranes were performed. At neutral pH, no N/K selectivity was observed, not for single components nor for mixtures. When the pH was increased towards alkaline environment, distinct selectivity for N/K was obtained both with model solutions and real liquid digestate. At a suitable pH of 10, with >80 % of the total ammonia present as NH<sub>3</sub>, the RO BW membrane showed a large N/K selectivity of 35 in the crossflow system. Additional RO steps at low pH allows subsequent concentration of the formed NH<sub>4</sub><sup>+</sup> and K<sup>+</sup> fractions. The presented dynamic pH approach proofs that in a two-step RO system both N, and K-enriched fertilizers can be produced from real liquid digestate.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"190 ","pages":"Pages 644-653"},"PeriodicalIF":7.1,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142577978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A hybrid classification and evaluation method based on deep learning for decoration and renovation waste in view of recycling 基于深度学习的混合分类和评估方法，适用于装饰和装修垃圾的回收利用

IF 7.1 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Waste management

Pub Date : 2024-11-04 DOI: 10.1016/j.wasman.2024.10.027

Pujin Wang , Jianzhuang Xiao , Ruoyu Liu , Xingxing Qiang , Zhenhua Duan , Chaofeng Liang

The escalating volume of decoration and renovation waste (D&RW) amid the rapid urbanization in China has posed significant challenges for the effective recycling of this waste stream, primarily due to the difficulty of accurately assessing its precise composition. To enhance the recycling of high-value materials from D&RW, a comprehensive understanding of its composition and quality is crucial before sorting. In this study, we propose a hybrid method that combines instance segmentation deep learning (DL) models with morphological machine learning (ML) models to automate the classification and evaluation of D&RW. A meticulously labeled dataset comprising 53,000 individual grains is curated for classification and instance segmentation. Subsequently, the ML model predicts the equivalent thickness of a grain according to the grain morphological data vector. The D&RW grains are then evaluated for weight based on the model outputs. The proposed method exhibits remarkable accuracy, as indicated by a relative low error of 2.8% in total weight evaluation between the model’s predictions and manual sorting.

随着中国城市化进程的加快，装饰装修垃圾（D&RW）的数量不断攀升，这给垃圾的有效回收利用带来了巨大挑战，其主要原因是难以准确评估垃圾的精确成分。为了提高 D&RW 中高价值材料的回收利用率，在分拣前全面了解其成分和质量至关重要。在本研究中，我们提出了一种将实例分割深度学习（DL）模型与形态学机器学习（ML）模型相结合的混合方法，以实现 D&RW 的自动分类和评估。为了进行分类和实例分割，我们策划了一个由 53,000 个谷物组成的精心标注的数据集。随后，ML 模型根据谷物形态数据向量预测谷物的等效厚度。然后根据模型输出结果对 D&RW 谷粒进行权重评估。模型预测与人工分拣之间的总权重评估误差相对较低，仅为 2.8%，这表明所提出的方法具有极高的准确性。

{"title":"A hybrid classification and evaluation method based on deep learning for decoration and renovation waste in view of recycling","authors":"Pujin Wang , Jianzhuang Xiao , Ruoyu Liu , Xingxing Qiang , Zhenhua Duan , Chaofeng Liang","doi":"10.1016/j.wasman.2024.10.027","DOIUrl":"10.1016/j.wasman.2024.10.027","url":null,"abstract":"<div><div>The escalating volume of decoration and renovation waste (D&RW) amid the rapid urbanization in China has posed significant challenges for the effective recycling of this waste stream, primarily due to the difficulty of accurately assessing its precise composition. To enhance the recycling of high-value materials from D&RW, a comprehensive understanding of its composition and quality is crucial before sorting. In this study, we propose a hybrid method that combines instance segmentation deep learning (DL) models with morphological machine learning (ML) models to automate the classification and evaluation of D&RW. A meticulously labeled dataset comprising 53,000 individual grains is curated for classification and instance segmentation. Subsequently, the ML model predicts the equivalent thickness of a grain according to the grain morphological data vector. The D&RW grains are then evaluated for weight based on the model outputs. The proposed method exhibits remarkable accuracy, as indicated by a relative low error of 2.8% in total weight evaluation between the model’s predictions and manual sorting.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"191 ","pages":"Pages 1-12"},"PeriodicalIF":7.1,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Treating waste with waste: Treatment of textile wastewater using upcycled food waste as a pore-forming agent in the fabrication of ceramic membranes employing DOE/FFD design 以废治废：在采用 DOE/FFD 设计的陶瓷膜制造过程中，使用可循环利用的厨余作为孔隙形成剂处理纺织废水。

IF 7.1 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Waste management

Pub Date : 2024-11-03 DOI: 10.1016/j.wasman.2024.10.029

Yassine Rakcho , Aicha Naboulsi , Taoufiq Bouzid , Younes Abouliatim , Abdelaziz Benhammou , Abdelkrim Abourriche , Jones Alami

This study investigates a novel method for food waste management by using it as a sustainable replacement for conventional pore-forming agents in ceramic membrane production. The membranes were analyzed using various techniques, including X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and a universal testing machine. The morphologies of the membranes were observed using scan electron microscopy (SEM). The effects of particle size (45–125 μm), pore-forming agent (5–20 wt%), and sintering temperature (900–1150 °C) on the porosity and mechanical strength of the membranes were investigated using the Design of Experiments (DoE) and Response Surface Methodology (RSM). The optimized membrane was evaluated for its performance in filtering industrial textile wastewater. It achieved impressive results, with approximately 98.4 % removal of turbidity and 71.3 % removal of chemical oxygen demand. This research paves the way for optimizing ceramic membrane fabrication using upcycled food waste, promoting sustainability and offering potential solutions for both food waste management and industrial wastewater treatment challenges.

本研究通过在陶瓷膜生产中使用厨余作为传统成孔剂的可持续替代品，探讨了一种新型厨余管理方法。研究人员使用多种技术对膜进行了分析，包括 X 射线衍射 (XRD)、傅立叶变换红外光谱 (FT-IR)、热重分析 (TGA) 和万能试验机。使用扫描电子显微镜（SEM）观察了膜的形态。使用实验设计（DoE）和响应面方法（RSM）研究了粒度（45-125 μm）、成孔剂（5-20 wt%）和烧结温度（900-1150 ℃）对膜的孔隙率和机械强度的影响。对优化后的膜在过滤工业纺织废水方面的性能进行了评估。结果令人印象深刻，浊度去除率约为 98.4%，化学需氧量去除率约为 71.3%。这项研究为利用可回收厨余优化陶瓷膜制造铺平了道路，促进了可持续发展，并为厨余管理和工业废水处理难题提供了潜在的解决方案。

{"title":"Treating waste with waste: Treatment of textile wastewater using upcycled food waste as a pore-forming agent in the fabrication of ceramic membranes employing DOE/FFD design","authors":"Yassine Rakcho , Aicha Naboulsi , Taoufiq Bouzid , Younes Abouliatim , Abdelaziz Benhammou , Abdelkrim Abourriche , Jones Alami","doi":"10.1016/j.wasman.2024.10.029","DOIUrl":"10.1016/j.wasman.2024.10.029","url":null,"abstract":"<div><div>This study investigates a novel method for food waste management by using it as a sustainable replacement for conventional pore-forming agents in ceramic membrane production. The membranes were analyzed using various techniques, including X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and a universal testing machine. The morphologies of the membranes were observed using scan electron microscopy (SEM). The effects of particle size (45–125 μm), pore-forming agent (5–20 wt%), and sintering temperature (900–1150 °C) on the porosity and mechanical strength of the membranes were investigated using the Design of Experiments (DoE) and Response Surface Methodology (RSM). The optimized membrane was evaluated for its performance in filtering industrial textile wastewater. It achieved impressive results, with approximately 98.4 % removal of turbidity and 71.3 % removal of chemical oxygen demand. This research paves the way for optimizing ceramic membrane fabrication using upcycled food waste, promoting sustainability and offering potential solutions for both food waste management and industrial wastewater treatment challenges.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"190 ","pages":"Pages 632-643"},"PeriodicalIF":7.1,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142569759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Monitoring sustainable waste management in OECD countries: A Malmquist productivity approach 监测经合组织国家的可持续废物管理：Malmquist 生产率方法。

IF 7.1 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Waste management

Pub Date : 2024-11-02 DOI: 10.1016/j.wasman.2024.10.035

George E. Halkos , Panagiotis – Stavros C. Aslanidis

Sustainable waste management (SWM) practices are crucial for tackling environmental concerns under a circular economy (CE) scope. Thirty-one OECD countries have been evaluated on their national SWM performance via Malmquist data envelopment analysis (DEA) methodology from 2000 to 2021. The Malmquist (MPI) and Malmquist-Luenberger (MLPI) productivity indices are compared based on their total factor productivity (TFP) and its elements (i.e., efficiency and technological changes). Both models have the gross domestic product (GDP) as a desirable output, but MLPI also incorporates municipal solid waste (MSW) generation and greenhouse gases (GHGs, i.e. CO₂ and CH₄) as undesirable outputs. MLPI has a lower average performance (1.74%) than MPI (4.42%), meaning that the incorporation of waste and GHGs has diminished an OECD country’s SWM performance by 2.5 times on average. In essence, it is innovation that drives TFP in the selected countries. Overall, the synergistic implementation of SWM practices, Malmquist DEA-based methodology, and CE principles is crucial for advancing sustainable development and achieving a circular and resilient future. The manuscript also offers policy implications regarding the need of financial incentives, vocational training, and fostering stakeholder encouragement in the waste sectors to implement CE solutions.

可持续废物管理（SWM）实践对于解决循环经济（CE）范围内的环境问题至关重要。从 2000 年到 2021 年，经合组织通过 Malmquist 数据包络分析 (DEA) 方法对 31 个国家的废物管理绩效进行了评估。马尔姆奎斯特（MPI）和马尔姆奎斯特-伦伯格（MLPI）生产率指数是根据其全要素生产率（TFP）及其要素（即效率和技术变化）进行比较的。两个模型都将国内生产总值（GDP）作为理想产出，但 MLPI 还将城市固体废物（MSW）的产生和温室气体（GHGs，即 CO2 和 CH4）作为不理想产出。MLPI 的平均绩效（1.74%）低于 MPI（4.42%），这意味着纳入废物和温室气体后，经合组织国家的社会安全管理绩效平均降低了 2.5 倍。从本质上讲，是创新推动了选定国家的全要素生产率。总之，协同实施 SWM 方法、基于 Malmquist DEA 的方法和 CE 原则，对于推进可持续发展和实现循环、有韧性的未来至关重要。该手稿还提供了有关需要财政激励、职业培训和促进废物处理部门利益相关者鼓励实施能源效率解决方案的政策影响。

{"title":"Monitoring sustainable waste management in OECD countries: A Malmquist productivity approach","authors":"George E. Halkos , Panagiotis – Stavros C. Aslanidis","doi":"10.1016/j.wasman.2024.10.035","DOIUrl":"10.1016/j.wasman.2024.10.035","url":null,"abstract":"<div><div>Sustainable waste management (SWM) practices are crucial for tackling environmental concerns under a circular economy (CE) scope. Thirty-one OECD countries have been evaluated on their national SWM performance via Malmquist data envelopment analysis (DEA) methodology from 2000 to 2021. The Malmquist (MPI) and Malmquist-Luenberger (MLPI) productivity indices are compared based on their total factor productivity (TFP) and its elements (i.e., efficiency and technological changes). Both models have the gross domestic product (GDP) as a desirable output, but MLPI also incorporates municipal solid waste (MSW) generation and greenhouse gases (GHGs, i.e. CO<sub>2</sub> and CH<sub>4</sub>) as undesirable outputs. MLPI has a lower average performance (1.74%) than MPI (4.42%), meaning that the incorporation of waste and GHGs has diminished an OECD country’s SWM performance by 2.5 times on average. In essence, it is innovation that drives TFP in the selected countries. Overall, the synergistic implementation of SWM practices, Malmquist DEA-based methodology, and CE principles is crucial for advancing sustainable development and achieving a circular and resilient future. The manuscript also offers policy implications regarding the need of financial incentives, vocational training, and fostering stakeholder encouragement in the waste sectors to implement CE solutions.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"190 ","pages":"Pages 623-631"},"PeriodicalIF":7.1,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142569758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Perceived social cohesion and littering control behavior in China: The mediating role of subjective social status 感知到的社会凝聚力与中国的垃圾控制行为：主观社会地位的中介作用

IF 7.1 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Waste management

Pub Date : 2024-10-31 DOI: 10.1016/j.wasman.2024.10.024

Yang Zhao, Steven Van de Walle

Littering is a serious social issue in China, even though residents disapprove of this behavior. When residents live in communities with high social cohesion, residents may stop other residents from littering; this is referred to as littering control behavior. We use collective efficacy theory to discuss the association between perceived social cohesion and littering control behavior in China. Perceived social cohesion consists of social relationship density, social trust, and social support, which can promote littering control behavior and thus achieve collective efficacy. Using binary logistic regression and mediation analyses, we address this question via the 2018 wave of the China Labor-force Dynamics Survey (n = 4808). We find that perceived social cohesion is positively associated with littering control behavior. We also find that subjective social status may be a mediating mechanism through which perceived social cohesion promotes littering control behavior. For governments, policies to stop littering should address social cohesion and improve residents’ subjective social status.

在中国，乱扔垃圾是一个严重的社会问题，尽管居民并不赞成这种行为。当居民生活在社会凝聚力较高的社区时，居民可能会阻止其他居民乱扔垃圾，这被称为乱扔垃圾控制行为。我们运用集体效能理论来讨论中国的感知社会凝聚力与垃圾控制行为之间的关联。感知社会凝聚力包括社会关系密度、社会信任和社会支持，它们可以促进垃圾控制行为，从而实现集体效能。利用二元逻辑回归和中介分析，我们通过 2018 年中国劳动力动态调查（n = 4808）解决了这一问题。我们发现，感知社会凝聚力与垃圾控制行为正相关。我们还发现，主观社会地位可能是感知社会凝聚力促进垃圾控制行为的中介机制。对于政府而言，制止乱扔垃圾的政策应解决社会凝聚力问题，提高居民的主观社会地位。

{"title":"Perceived social cohesion and littering control behavior in China: The mediating role of subjective social status","authors":"Yang Zhao, Steven Van de Walle","doi":"10.1016/j.wasman.2024.10.024","DOIUrl":"10.1016/j.wasman.2024.10.024","url":null,"abstract":"<div><div>Littering is a serious social issue in China, even though residents disapprove of this behavior. When residents live in communities with high social cohesion, residents may stop other residents from littering; this is referred to as littering control behavior. We use collective efficacy theory to discuss the association between perceived social cohesion and littering control behavior in China. Perceived social cohesion consists of social relationship density, social trust, and social support, which can promote littering control behavior and thus achieve collective efficacy. Using binary logistic regression and mediation analyses, we address this question via the 2018 wave of the China Labor-force Dynamics Survey (n = 4808). We find that perceived social cohesion is positively associated with littering control behavior. We also find that subjective social status may be a mediating mechanism through which perceived social cohesion promotes littering control behavior. For governments, policies to stop littering should address social cohesion and improve residents’ subjective social status.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"190 ","pages":"Pages 613-622"},"PeriodicalIF":7.1,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142560606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of preferential flow and leakage location in landfill: A field tracer test and numerical analysis 垃圾填埋场优先流和渗漏位置调查：现场示踪试验和数值分析。

IF 7.1 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Waste management

Pub Date : 2024-10-30 DOI: 10.1016/j.wasman.2024.10.021

Shuangke Fei , Haijian Xie , Peifu Cai , Weizhong Xu , Hongyan Li

A field tracer test was carried out in an uncontrolled valley-type landfill. Fluorobenzoic acid (FBA) was firstly used in the landfill to study the preferential flow. A two-dimensional advection–diffusion dual-porosity model coupled with indirect streamline and terrain conditions was developed to analyze the breakthrough curves. The leakage location method was proposed based on the volume proportion of fracture domain in the total domain w_f distribution. The results show that FBA is an excellent tracer due to its lower dosage, high peak concentration and long residence time at monitoring wells. The tracer transport depth and length can reach up to 15 m and 86.3 m, respectively. Diffusion drive the tracer flow to upstream with high velocity. The anisotropy value is mainly influenced by the effect of compression rather than the waste age. The horizontal preferential flows dominate in the landfill. The preferential flow is observed to be more obvious with the increasement of the depth due to the increasement of the content of 2D particles. The leakage probability of different part in the landfill is determined by the proposed dual-porosity model and leakage location method. The proposed leakage detection method can be used for active landfills, especially those with thick layers of wastes. It can also provide scientific guidance for the design of subsequent vertical barrier for the landfills.

在一个不受控制的山谷型垃圾填埋场进行了现场示踪试验。首先在填埋场中使用氟苯甲酸（FBA）来研究优先流。建立了二维平流-扩散双孔隙模型，并结合间接流线和地形条件对突破曲线进行了分析。根据断裂域在总域 wf 分布中的体积比例，提出了泄漏定位方法。结果表明，FBA 具有用量少、峰值浓度高、在监测井停留时间长等优点，是一种很好的示踪剂。示踪剂的迁移深度和长度分别可达 15 米和 86.3 米。扩散驱动示踪剂高速向上游流动。各向异性值主要受压缩效应而非废物年龄的影响。在垃圾填埋场中，水平优先流占据主导地位。由于二维颗粒含量的增加，随着深度的增加，优选流更为明显。通过所提出的双孔隙模型和泄漏定位方法，确定了填埋场中不同部分的泄漏概率。所提出的渗漏检测方法可用于活动垃圾填埋场，尤其是垃圾层较厚的填埋场。它还可以为垃圾填埋场后续垂直屏障的设计提供科学指导。

{"title":"Investigation of preferential flow and leakage location in landfill: A field tracer test and numerical analysis","authors":"Shuangke Fei , Haijian Xie , Peifu Cai , Weizhong Xu , Hongyan Li","doi":"10.1016/j.wasman.2024.10.021","DOIUrl":"10.1016/j.wasman.2024.10.021","url":null,"abstract":"<div><div>A field tracer test was carried out in an uncontrolled valley-type landfill. Fluorobenzoic acid (FBA) was firstly used in the landfill to study the preferential flow. A two-dimensional advection–diffusion dual-porosity model coupled with indirect streamline and terrain conditions was developed to analyze the breakthrough curves. The leakage location method was proposed based on the volume proportion of fracture domain in the total domain <em>w<sub>f</sub></em> distribution. The results show that FBA is an excellent tracer due to its lower dosage, high peak concentration and long residence time at monitoring wells. The tracer transport depth and length can reach up to 15 m and 86.3 m, respectively. Diffusion drive the tracer flow to upstream with high velocity. The anisotropy value is mainly influenced by the effect of compression rather than the waste age. The horizontal preferential flows dominate in the landfill. The preferential flow is observed to be more obvious with the increasement of the depth due to the increasement of the content of 2D particles. The leakage probability of different part in the landfill is determined by the proposed dual-porosity model and leakage location method. The proposed leakage detection method can be used for active landfills, especially those with thick layers of wastes. It can also provide scientific guidance for the design of subsequent vertical barrier for the landfills.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"190 ","pages":"Pages 600-612"},"PeriodicalIF":7.1,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142547946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0