Pub Date : 2024-12-27DOI: 10.1177/0734242X241306602
Tatjana Lasch, Karim Khodier, Christoph Feyerer, Markus Lehner, Renato Sarc
This article uses model materials to introduce a controlled, location- and manufacturer-independent internationally accepted method for assessing shredding machines based on large-scale tests. Furthermore, a better understanding of the comminution behaviour of shredders with fixed settings (gap width, shaft speed, cutting tool geometry) is in the focus of the present investigation and assessed, using the statistical analyses for particle size distribution in certain screen sections. Conclusions have been drawn on the comminution behaviour in general and the material-material interactions of different fractions in the grinding chamber of the shredder by showing significant differences in the pure fraction's comminution behaviour against the mixture's comminution behaviour. In addition, the effect of the wear condition of the cutting tools on the particle size distribution has been investigated using statistical tests. As a result, interactions of the materials in the shredder grinding chamber can be demonstrated. The null hypothesis of the statistical test can be rejected due to the p-values, which are around 0.01 and therefore less than the predetermined alpha, which is 0.05, meaning that the shredding behaviour of pure fractions and those in a mixture is different. Additional investigations of waste wood only have shown that the wear condition of the cutting tools does not exhibit any effect on the particle size distribution of waste wood, as seen in the p-value (0.29), which is higher than the used alpha value. This could mean that the cutting tools need to be changed less frequently, which could have a positive effect on plant operation.
{"title":"Influence of material-material interactions and wear on coarse waste shredders.","authors":"Tatjana Lasch, Karim Khodier, Christoph Feyerer, Markus Lehner, Renato Sarc","doi":"10.1177/0734242X241306602","DOIUrl":"https://doi.org/10.1177/0734242X241306602","url":null,"abstract":"<p><p>This article uses model materials to introduce a controlled, location- and manufacturer-independent internationally accepted method for assessing shredding machines based on large-scale tests. Furthermore, a better understanding of the comminution behaviour of shredders with fixed settings (gap width, shaft speed, cutting tool geometry) is in the focus of the present investigation and assessed, using the statistical analyses for particle size distribution in certain screen sections. Conclusions have been drawn on the comminution behaviour in general and the material-material interactions of different fractions in the grinding chamber of the shredder by showing significant differences in the pure fraction's comminution behaviour against the mixture's comminution behaviour. In addition, the effect of the wear condition of the cutting tools on the particle size distribution has been investigated using statistical tests. As a result, interactions of the materials in the shredder grinding chamber can be demonstrated. The null hypothesis of the statistical test can be rejected due to the <i>p</i>-values, which are around 0.01 and therefore less than the predetermined alpha, which is 0.05, meaning that the shredding behaviour of pure fractions and those in a mixture is different. Additional investigations of waste wood only have shown that the wear condition of the cutting tools does not exhibit any effect on the particle size distribution of waste wood, as seen in the <i>p</i>-value (0.29), which is higher than the used alpha value. This could mean that the cutting tools need to be changed less frequently, which could have a positive effect on plant operation.</p>","PeriodicalId":23671,"journal":{"name":"Waste Management & Research","volume":" ","pages":"734242X241306602"},"PeriodicalIF":3.7,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142898583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2024-12-27DOI: 10.1177/0734242X241304342
Nishith Jardosh, Vinish Kathuria
Monitoring plastic consumption in emerging economies such as India is crucial because in these countries more than half of the consumption gets converted into waste within a year. In 2022, the Government of India enforced the Plastic Waste Management Rules to manage plastic waste. This article aims to find the potential impact of these rules on plastic waste generation from now until 2050. The simulation is carried out in two steps. In step one, a material flow analysis is conducted that maps plastic flow from production to its end-of-life. Through this it is estimated that at an optimistic level, off the 20 million metric tonnes (Mt) of plastic consumed, around 10 Mt is added to stock, 4.5 Mt is recycled, 2.5 Mt is reutilized and the balance 3 Mt is mismanaged. In step two, through system dynamics model, the impact of policy instruments is estimated on each stage of the flow of plastic assuming a phased implementation. Through this model, it is found that annually mismanaged plastic waste increases 11 to 28 Mt in 2050 in a business-as-usual scenario; however, implementing all the policies in a phased manner would stabilize waste generation from 2040 onwards.
{"title":"Impact of regulatory policy instruments on plastic waste generation in India: A system dynamics approach.","authors":"Nishith Jardosh, Vinish Kathuria","doi":"10.1177/0734242X241304342","DOIUrl":"https://doi.org/10.1177/0734242X241304342","url":null,"abstract":"<p><p>Monitoring plastic consumption in emerging economies such as India is crucial because in these countries more than half of the consumption gets converted into waste within a year. In 2022, the Government of India enforced the Plastic Waste Management Rules to manage plastic waste. This article aims to find the potential impact of these rules on plastic waste generation from now until 2050. The simulation is carried out in two steps. In step one, a material flow analysis is conducted that maps plastic flow from production to its end-of-life. Through this it is estimated that at an optimistic level, off the 20 million metric tonnes (Mt) of plastic consumed, around 10 Mt is added to stock, 4.5 Mt is recycled, 2.5 Mt is reutilized and the balance 3 Mt is mismanaged. In step two, through system dynamics model, the impact of policy instruments is estimated on each stage of the flow of plastic assuming a phased implementation. Through this model, it is found that annually mismanaged plastic waste increases 11 to 28 Mt in 2050 in a business-as-usual scenario; however, implementing all the policies in a phased manner would stabilize waste generation from 2040 onwards.</p>","PeriodicalId":23671,"journal":{"name":"Waste Management & Research","volume":" ","pages":"734242X241304342"},"PeriodicalIF":3.7,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142898582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2024-12-16DOI: 10.1177/0734242X241305909
Olena Hanoshenko, Mykola Halaktionov, Marion Huber-Humer
The war in Ukraine and its consequences are becoming a disaster not only on a national scale but also for many other countries. The overview and considerations on such consequences given in this article shall help in managing and restoring (Ukrainian) territories after war. A structured analysis of literature about the war and post-war impact on the environment paired with 'grey literature' and the collection of currently available information from regional and national government agencies and official organizations on the specific situation in Ukraine, with a particular focus on waste management issues, was conducted. The main groups of environmental components affected by military actions are analysed, systematized, and classified. It is shown that the negative impact of military actions has irreversible consequences for the environment not only in Ukraine but is also already gaining global proportions. In addition, much of the infrastructure in the waste management sector has been destroyed, meaning that large volumes of unsorted and untreated waste are now ending up in landfills, most of which are uncontrolled since other more effective and sustainable environmental and waste management options are currently missing. Therefore, it is necessary to develop remediation concepts and implement comprehensive measures to clean up the territories and restore environmental components and the waste management sector after war. This includes - among other issues - assessing or measuring the generation and composition of post-war demolition waste and municipal solid waste during and after the war as a basis for further planning and decision-making.
{"title":"Exploratory study on the impact of military actions on the environment and infrastructure in the current Ukraine war with a specific focus on waste management.","authors":"Olena Hanoshenko, Mykola Halaktionov, Marion Huber-Humer","doi":"10.1177/0734242X241305909","DOIUrl":"https://doi.org/10.1177/0734242X241305909","url":null,"abstract":"<p><p>The war in Ukraine and its consequences are becoming a disaster not only on a national scale but also for many other countries. The overview and considerations on such consequences given in this article shall help in managing and restoring (Ukrainian) territories after war. A structured analysis of literature about the war and post-war impact on the environment paired with 'grey literature' and the collection of currently available information from regional and national government agencies and official organizations on the specific situation in Ukraine, with a particular focus on waste management issues, was conducted. The main groups of environmental components affected by military actions are analysed, systematized, and classified. It is shown that the negative impact of military actions has irreversible consequences for the environment not only in Ukraine but is also already gaining global proportions. In addition, much of the infrastructure in the waste management sector has been destroyed, meaning that large volumes of unsorted and untreated waste are now ending up in landfills, most of which are uncontrolled since other more effective and sustainable environmental and waste management options are currently missing. Therefore, it is necessary to develop remediation concepts and implement comprehensive measures to clean up the territories and restore environmental components and the waste management sector after war. This includes - among other issues - assessing or measuring the generation and composition of post-war demolition waste and municipal solid waste during and after the war as a basis for further planning and decision-making.</p>","PeriodicalId":23671,"journal":{"name":"Waste Management & Research","volume":" ","pages":"734242X241305909"},"PeriodicalIF":3.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142830018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2024-12-16DOI: 10.1177/0734242X241304321
Meserecordias Wilfred Lema
This article aims to undertake a mini-review of the current state of electronic waste (e-waste) challenges on the African continent through a systematic analysis of existing national policies and legal frameworks, inventorying established management practices, and identification of innovative technological solutions. A literature review was conducted synthesizing evidence from over 80 peer-reviewed publications between 2010 and 2022. Content analysis of e-waste laws from 20 African countries supplemented the review of documented collection, recycling and export-related activities across the region alongside associated obstacles. Key findings indicate that while several African countries have enacted initial e-waste regulations, significant gaps persist around implementation and enforcement capabilities. Formal recycling remains minimal due to underdeveloped infrastructure, and the majority of e-scrap continues to be crudely processed informally resulting to health and environmental risks. Monitoring of transboundary trade and treatment standards also requires strengthening to curb the flow of undocumented shipments. Several technological start-ups and social enterprises are piloting novel approaches but require further testing and scale-up support. Based on these insights, the study recommends a harmonized policy framework and monitoring systems established through regional coordination. Recommendations also propose strategies to incentivize reducing consumption and promote eco-industrial parks for integrated recycling.
{"title":"Managing the e-waste crisis in Africa: A mini-review of policies, practices, technologies and business model innovations.","authors":"Meserecordias Wilfred Lema","doi":"10.1177/0734242X241304321","DOIUrl":"https://doi.org/10.1177/0734242X241304321","url":null,"abstract":"<p><p>This article aims to undertake a mini-review of the current state of electronic waste (e-waste) challenges on the African continent through a systematic analysis of existing national policies and legal frameworks, inventorying established management practices, and identification of innovative technological solutions. A literature review was conducted synthesizing evidence from over 80 peer-reviewed publications between 2010 and 2022. Content analysis of e-waste laws from 20 African countries supplemented the review of documented collection, recycling and export-related activities across the region alongside associated obstacles. Key findings indicate that while several African countries have enacted initial e-waste regulations, significant gaps persist around implementation and enforcement capabilities. Formal recycling remains minimal due to underdeveloped infrastructure, and the majority of e-scrap continues to be crudely processed informally resulting to health and environmental risks. Monitoring of transboundary trade and treatment standards also requires strengthening to curb the flow of undocumented shipments. Several technological start-ups and social enterprises are piloting novel approaches but require further testing and scale-up support. Based on these insights, the study recommends a harmonized policy framework and monitoring systems established through regional coordination. Recommendations also propose strategies to incentivize reducing consumption and promote eco-industrial parks for integrated recycling.</p>","PeriodicalId":23671,"journal":{"name":"Waste Management & Research","volume":" ","pages":"734242X241304321"},"PeriodicalIF":3.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142830020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
High-quality recycling of photovoltaic (PV) modules starts with a delamination process. It aims to remove the encapsulation layer between glass and solar cells. Many studies have investigated the delamination of ethylene-vinyl acetate encapsulant, whereas the delamination of polyolefin elastomer (POE) encapsulation in solar modules remains a research gap. This study presents methods of solvent and thermal treatment for the separation of layers in a PV module encapsulated with POE polymer. Various organic compounds were tested for the solvent treatment. The results showed that most of the solvents did not separate the materials. However, with some of them, polymer swelling was achieved. Glycerol was the only solvent capable of separating glass from multi-material laminate. The separated glass does not include contaminants and is therefore suitable for the use as a secondary material. However, the solar cells remained encapsulated in the polymer, thus additional processing is needed to remove it. The time and solvent temperature for glycerol treatment were measured. The thermal treatment was conducted based on the results of thermogravimetric analyses, which determined the degradation of POE under heating conditions. Thermal treatment at 500°C for 1 hour in an air atmosphere was found to be the effective way to detach PV layers. Glass, solar cells and metal ribbons were separated without polymer contamination and are therefore suitable for further use.
{"title":"An application of solvent and thermal treatment to recover materials from photovoltaic module encapsulated with polyolefin elastomer.","authors":"Aistis Rapolas Zubas, Inna Pitak, Gintaras Denafas, Egidijus Griškonis, Jolita Kruopienė","doi":"10.1177/0734242X241305092","DOIUrl":"https://doi.org/10.1177/0734242X241305092","url":null,"abstract":"<p><p>High-quality recycling of photovoltaic (PV) modules starts with a delamination process. It aims to remove the encapsulation layer between glass and solar cells. Many studies have investigated the delamination of ethylene-vinyl acetate encapsulant, whereas the delamination of polyolefin elastomer (POE) encapsulation in solar modules remains a research gap. This study presents methods of solvent and thermal treatment for the separation of layers in a PV module encapsulated with POE polymer. Various organic compounds were tested for the solvent treatment. The results showed that most of the solvents did not separate the materials. However, with some of them, polymer swelling was achieved. Glycerol was the only solvent capable of separating glass from multi-material laminate. The separated glass does not include contaminants and is therefore suitable for the use as a secondary material. However, the solar cells remained encapsulated in the polymer, thus additional processing is needed to remove it. The time and solvent temperature for glycerol treatment were measured. The thermal treatment was conducted based on the results of thermogravimetric analyses, which determined the degradation of POE under heating conditions. Thermal treatment at 500°C for 1 hour in an air atmosphere was found to be the effective way to detach PV layers. Glass, solar cells and metal ribbons were separated without polymer contamination and are therefore suitable for further use.</p>","PeriodicalId":23671,"journal":{"name":"Waste Management & Research","volume":" ","pages":"734242X241305092"},"PeriodicalIF":3.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142829944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Plastic pollution has been identified as one of the most pressing environmental issues of the 21st century, driven by excessive consumption and inadequate plastic waste management. This issue is particularly reflected in short lifespan of plastic products, particularly plastic packaging within the food and beverage (F&B) industry. Urgent and relevant policy actions are needed to promote plastic circularity and improve waste management practices. Developing countries such as Montenegro face significant challenges in managing plastic waste flows due to legal, institutional and infrastructural gaps. This research addresses these challenges by employing material flow analysis (MFA) and advanced techniques like artificial neural networks to estimate the quantities and types of plastic packaging used in the F&B sector in Montenegro. The findings reveal that over 21,300 tonnes of F&B plastic packaging were placed on the market in Montenegro in 2018. Approximately 11% of this amount ends up directly littered in the environment or dumpsites, whereas the remaining 89% is predominantly collected and deposited in controlled landfills. Detailed MFA models were developed separately for the eight most common polymer types used in the F&B sector, along with specific models for plastic bags and polyethene terephthalate bottles to explore closed-loop recycling systems. It was found that only a small fraction of all analysed types of plastic packaging placed on the market can be effectively treated and recycled. This research contributes to the understanding of plastic waste management in Montenegro and facilitates the formulation of effective strategies to mitigate plastic pollution in the F&B industry.
{"title":"Assessment of type and quantities of food and beverage plastic packaging: A case study.","authors":"Goran Bošković, Nemanja Stanisavljević, Bojan Batinić, Srđan Kovačević, Nebojša Jovičić, Angelina Cvetanović","doi":"10.1177/0734242X241302450","DOIUrl":"https://doi.org/10.1177/0734242X241302450","url":null,"abstract":"<p><p>Plastic pollution has been identified as one of the most pressing environmental issues of the 21st century, driven by excessive consumption and inadequate plastic waste management. This issue is particularly reflected in short lifespan of plastic products, particularly plastic packaging within the food and beverage (F&B) industry. Urgent and relevant policy actions are needed to promote plastic circularity and improve waste management practices. Developing countries such as Montenegro face significant challenges in managing plastic waste flows due to legal, institutional and infrastructural gaps. This research addresses these challenges by employing material flow analysis (MFA) and advanced techniques like artificial neural networks to estimate the quantities and types of plastic packaging used in the F&B sector in Montenegro. The findings reveal that over 21,300 tonnes of F&B plastic packaging were placed on the market in Montenegro in 2018. Approximately 11% of this amount ends up directly littered in the environment or dumpsites, whereas the remaining 89% is predominantly collected and deposited in controlled landfills. Detailed MFA models were developed separately for the eight most common polymer types used in the F&B sector, along with specific models for plastic bags and polyethene terephthalate bottles to explore closed-loop recycling systems. It was found that only a small fraction of all analysed types of plastic packaging placed on the market can be effectively treated and recycled. This research contributes to the understanding of plastic waste management in Montenegro and facilitates the formulation of effective strategies to mitigate plastic pollution in the F&B industry.</p>","PeriodicalId":23671,"journal":{"name":"Waste Management & Research","volume":" ","pages":"734242X241302450"},"PeriodicalIF":3.7,"publicationDate":"2024-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142795228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Environmental attitude, value and awareness are widely believed to help reach the goal of cutting global food waste, but these psychological and cognitive factors are not always good predictors of wasteful behaviours. Notably, it is still unclear how the role of pro-environmental attitude (PEA) in reducing household food waste (HFW) changes with grocery shopping distance. To this end, using 7319 households survey data from China, this study investigates the moderating effect of shopping distance on the link between PEA and HFW behaviour. The results of Tobit regressions show that PEA is an important predictor of actual HFW behaviour in the absence of the constraint of shopping distance. However, the expansion of shopping distance will weaken the positive role of PEA in reducing HFW. It indicates that, due to the temporal and financial constraints generated by shopping distance, there is a certain degree of hypothetical deviation between the wasteful behaviours that individuals actually exhibit and their stated PEA. Our findings, from the perspective of the moderating effect of shopping distance, explain why some individuals deviate from their stated PEA in HFW behaviour, which provides a new insight into the generation of 'attitude-behaviour' gap. Therefore, policy interventions that merely enhancing environmental education may have limited effect on reducing food waste; instead, the promotion of citizen environmental ethics should be combined with efforts to improve the accessibility of retail infrastructures.
人们普遍认为,环保态度、价值观和意识有助于实现减少全球食物浪费的目标,但这些心理和认知因素并不总是浪费行为的良好预测因素。值得注意的是,亲环境态度(PEA)在减少家庭食物浪费(HFW)中的作用如何随购物距离的变化而变化,目前仍不清楚。为此,本研究利用中国 7319 个家庭的调查数据,探讨了购物距离对亲环境态度与家庭食物浪费行为之间联系的调节作用。Tobit 回归结果表明,在没有购物距离限制的情况下,PEA 是预测实际高频消费行为的重要因素。然而,购物距离的扩大会削弱 PEA 在减少高频挥霍方面的积极作用。这表明,由于购物距离产生的时间和经济限制,个人实际表现出的浪费行为与他们声明的 PEA 之间存在一定程度的假设偏差。我们的研究结果从购物距离的调节作用角度,解释了为什么有些人的高家庭消费行为会偏离其声明的 PEA,这为 "态度-行为 "差距的产生提供了新的视角。因此,仅仅加强环境教育的政策干预对减少食物浪费的效果可能有限;相反,公民环境道德的宣传应与改善零售基础设施的可及性相结合。
{"title":"New insights into the link between pro-environmental attitudes and household food waste behaviours in China: Moderating effect of shopping distance.","authors":"Hong-Xing Wen, Xiao-Qing Wu, Ting Cui, Zhen-Ni Yang, You-Hua Chen","doi":"10.1177/0734242X231219628","DOIUrl":"10.1177/0734242X231219628","url":null,"abstract":"<p><p>Environmental attitude, value and awareness are widely believed to help reach the goal of cutting global food waste, but these psychological and cognitive factors are not always good predictors of wasteful behaviours. Notably, it is still unclear how the role of pro-environmental attitude (PEA) in reducing household food waste (HFW) changes with grocery shopping distance. To this end, using 7319 households survey data from China, this study investigates the moderating effect of shopping distance on the link between PEA and HFW behaviour. The results of Tobit regressions show that PEA is an important predictor of actual HFW behaviour in the absence of the constraint of shopping distance. However, the expansion of shopping distance will weaken the positive role of PEA in reducing HFW. It indicates that, due to the temporal and financial constraints generated by shopping distance, there is a certain degree of hypothetical deviation between the wasteful behaviours that individuals actually exhibit and their stated PEA. Our findings, from the perspective of the moderating effect of shopping distance, explain why some individuals deviate from their stated PEA in HFW behaviour, which provides a new insight into the generation of 'attitude-behaviour' gap. Therefore, policy interventions that merely enhancing environmental education may have limited effect on reducing food waste; instead, the promotion of citizen environmental ethics should be combined with efforts to improve the accessibility of retail infrastructures.</p>","PeriodicalId":23671,"journal":{"name":"Waste Management & Research","volume":" ","pages":"1218-1230"},"PeriodicalIF":3.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139075156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2024-12-01Epub Date: 2024-01-13DOI: 10.1177/0734242X231219631
Golnoosh Banitalebi, Mohammad Reza Mosaddeghi, Hossein Shariatmadari
A large amount of agricultural waste is produced annually. Producing biochar is an excellent solution for waste management, resource recovery, emission reduction, energy production, reduction in transportation and enhancing carbon sequestration. This study was done to investigate the aeration status of biochar-based growth media as compared with the commercial soilless medium of cocopeat-perlite. Biochars from oven-dried residues were produced by slow pyrolysis at 300 (B300) and 500°C (B500) with a rate of 2°C min-1 and using a continuous inflow of nitrogen. Sawdust (Sd), wheat straw (WS), rice hull (Rh), palm bunches (Plm) and sugarcane bagasse (SC), their biochars, vermiculite (V) and zeolite (Z) were used to prepare 13 mixed growth media. Oxygen diffusion coefficient (Dp) of media was measured at six matric potentials (h) of -5, -10, -15, -20, -40 and -60 hPa. Troeh et al. (1982) model was fitted to Dp/D0 versus air-filled porosity (AFP) data. Although AFP was more than 0.1 m3 m-3 for some media, the Dp/D0 was very low. Considering optimum Dp/D0 (i.e. 0.010-0.015) for growth substrates at h = -8 hPa, aeration status of four media (cocopeat-perlite, Rh-SCB300-Z, Sd-SCB300-Z and WSB500-Rh-V) was optimum. Highest Dp/D0 at h = -8 hPa was observed for Rh-SCB300-Z. The AFP at h = -10 hPa was highest for Rh-SCB300-Z, cocopeat-perlite and WSB500-Rh-V. Biochar-based media with good aeration status and water retention can be a suitable substitute for commercial soilless culture in greenhouse production. Overall, WSB500-Rh-V is a suitable substitute for cocopeat-perlite.
{"title":"Oxygen diffusion in biochar-based mixtures as plant growth media: Experimental and modelling.","authors":"Golnoosh Banitalebi, Mohammad Reza Mosaddeghi, Hossein Shariatmadari","doi":"10.1177/0734242X231219631","DOIUrl":"10.1177/0734242X231219631","url":null,"abstract":"<p><p>A large amount of agricultural waste is produced annually. Producing biochar is an excellent solution for waste management, resource recovery, emission reduction, energy production, reduction in transportation and enhancing carbon sequestration. This study was done to investigate the aeration status of biochar-based growth media as compared with the commercial soilless medium of cocopeat-perlite. Biochars from oven-dried residues were produced by slow pyrolysis at 300 (B300) and 500°C (B500) with a rate of 2°C min<sup>-1</sup> and using a continuous inflow of nitrogen. Sawdust (Sd), wheat straw (WS), rice hull (Rh), palm bunches (Plm) and sugarcane bagasse (SC), their biochars, vermiculite (V) and zeolite (Z) were used to prepare 13 mixed growth media. Oxygen diffusion coefficient (<i>D</i><sub>p</sub>) of media was measured at six matric potentials (<i>h</i>) of -5, -10, -15, -20, -40 and -60 hPa. Troeh et al. (1982) model was fitted to <i>D</i><sub>p</sub>/<i>D</i><sub>0</sub> versus air-filled porosity (AFP) data. Although AFP was more than 0.1 m<sup>3</sup> m<sup>-3</sup> for some media, the <i>D</i><sub>p</sub>/<i>D</i><sub>0</sub> was very low. Considering optimum <i>D</i><sub>p</sub>/<i>D</i><sub>0</sub> (i.e. 0.010-0.015) for growth substrates at <i>h</i> = -8 hPa, aeration status of four media (cocopeat-perlite, Rh-SCB300-Z, Sd-SCB300-Z and WSB500-Rh-V) was optimum. Highest <i>D</i><sub>p</sub>/<i>D</i><sub>0</sub> at <i>h</i> = -8 hPa was observed for Rh-SCB300-Z. The AFP at <i>h</i> = -10 hPa was highest for Rh-SCB300-Z, cocopeat-perlite and WSB500-Rh-V. Biochar-based media with good aeration status and water retention can be a suitable substitute for commercial soilless culture in greenhouse production. Overall, WSB500-Rh-V is a suitable substitute for cocopeat-perlite.</p>","PeriodicalId":23671,"journal":{"name":"Waste Management & Research","volume":" ","pages":"1195-1207"},"PeriodicalIF":3.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11608519/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139467096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2024-12-01Epub Date: 2024-01-31DOI: 10.1177/0734242X241227368
Inas A Hashem, Ronggui Hu, Mohamed Hh Abbas, Taghred A Hashem, Muhammad Hamzah Saleem, Wenbing Zhou, Naidong Xiao
Liquid fertilizers (LFs) produced by microwave-assisted acid hydrolysis of livestock and poultry wastes were applied to potted hot pepper (Capsicum annuum L.) to evaluate their potential to be used as amino acid LFs. A preliminary experiment was conducted to determine the optimum acid-hydrolysis conditions for producing LFs from a mixture of pig hair and faeces (P) and another mixture of chicken feathers and faeces (C). Two LFs were produced under the optimum acid-hydrolysis conditions (acidification by sulphuric acid (7.5 mol L-1) in a microwave (200 W) for 90 minutes), and a commercial amino acid LF (Guo Guang (GG)) was used for comparison. P, C and GG fertilizers were tested in potted hot pepper cultivation at two doses, whereas no fertilizer application served as the control (CK). P and C fertilizers significantly increased the fruit yield compared with GG fertilizer, particularly at the higher dose. Moreover, the treatments improved the fruit vitamin C and soluble sugar contents in the order of C > P > GG compared with CK. These results could be attributed to more types of amino acids in C fertilizer than in P and GG fertilizers. The results also indicated that the prepared fertilizers could significantly increase the shoot and root dry weight, soil available nitrogen and phosphorus contents and nitrogen, phosphorus, and potassium (NPK) uptake by plants compared with CK. In conclusion, microwave-assisted acid hydrolysis could effectively convert unusable wastes into valuable fertilizers comparable or even superior to commercial fertilizers.
通过微波辅助酸水解畜禽粪便生产的液体肥料(LFs)被用于盆栽辣椒(Capsicum annuum L.),以评估其作为氨基酸液体肥料的潜力。初步实验确定了从猪毛和粪便混合物(P)以及鸡毛和粪便混合物(C)中生产 LFs 的最佳酸水解条件。在最佳酸水解条件下(在微波炉(200 瓦)中用硫酸(7.5 摩尔/升-1)酸化 90 分钟)生产了两种 LF,并使用了一种商业氨基酸 LF(国光(GG))进行比较。在盆栽辣椒栽培中测试了两种剂量的 P 肥、C 肥和 GG 肥,而不施肥则作为对照(CK)。与 GG 肥料相比,P 肥料和 C 肥料能明显提高果实产量,尤其是在高剂量下。此外,与 CK 相比,这些处理提高了果实维生素 C 和可溶性糖的含量,顺序为 C > P > GG。这些结果可能是因为 C 肥料中的氨基酸种类多于 P 肥料和 GG 肥料。研究结果还表明,与 CK 相比,所制备的肥料能显著提高植物的芽和根的干重、土壤可利用氮和磷的含量以及氮、磷、钾(NPK)的吸收量。总之,微波辅助酸水解可以有效地将不可利用的废物转化为有价值的肥料,其效果可与商业肥料相媲美,甚至更胜一筹。
{"title":"Liquid fertilizers produced by microwave-assisted acid hydrolysis of livestock and poultry wastes and their effects on hot pepper cultivation.","authors":"Inas A Hashem, Ronggui Hu, Mohamed Hh Abbas, Taghred A Hashem, Muhammad Hamzah Saleem, Wenbing Zhou, Naidong Xiao","doi":"10.1177/0734242X241227368","DOIUrl":"10.1177/0734242X241227368","url":null,"abstract":"<p><p>Liquid fertilizers (LFs) produced by microwave-assisted acid hydrolysis of livestock and poultry wastes were applied to potted hot pepper (<i>Capsicum annuum</i> L.) to evaluate their potential to be used as amino acid LFs. A preliminary experiment was conducted to determine the optimum acid-hydrolysis conditions for producing LFs from a mixture of pig hair and faeces (P) and another mixture of chicken feathers and faeces (C). Two LFs were produced under the optimum acid-hydrolysis conditions (acidification by sulphuric acid (7.5 mol L<sup>-1</sup>) in a microwave (200 W) for 90 minutes), and a commercial amino acid LF (Guo Guang (GG)) was used for comparison. P, C and GG fertilizers were tested in potted hot pepper cultivation at two doses, whereas no fertilizer application served as the control (CK). P and C fertilizers significantly increased the fruit yield compared with GG fertilizer, particularly at the higher dose. Moreover, the treatments improved the fruit vitamin C and soluble sugar contents in the order of C > P > GG compared with CK. These results could be attributed to more types of amino acids in C fertilizer than in P and GG fertilizers. The results also indicated that the prepared fertilizers could significantly increase the shoot and root dry weight, soil available nitrogen and phosphorus contents and nitrogen, phosphorus, and potassium (NPK) uptake by plants compared with CK. In conclusion, microwave-assisted acid hydrolysis could effectively convert unusable wastes into valuable fertilizers comparable or even superior to commercial fertilizers.</p>","PeriodicalId":23671,"journal":{"name":"Waste Management & Research","volume":" ","pages":"1109-1118"},"PeriodicalIF":3.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11608509/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139651789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
In winter season, the burning of crop residues for ease of sowing the next crop, along with industrial emissions and vehicular pollution leads to settling of a thick layer of smog in northern part of India. Therefore, to understand the opinion of farmers regarding sustainable management of organic waste, the present study was conducted in Ludhiana district of Indian state of Punjab. An ex post facto research design was used and a total of 800 dairy farmers having significant crop area were selected randomly for the study, grouped equally as small and large dairy farmers. Results revealed that majority of farmers had a highly favourable opinion regarding organic waste management due to the fact that they were aware of the ill-effects of undesirable practices like crop residue burning. Further, to predict the farmers' opinion and the effect of independent variables on farmers' opinion, a multi-layer perceptron feed-forward deep neural network was developed with mean squared error of 0.036 and 0.137 for validation and training data sets respectively, marking a novel approach of analysing farmers' behaviour. The neural network highlighted that with increase in the magnitude of input variables, namely, education, experience in dairying, information source utilisation, knowledge regarding organic waste management, etc., the farmers' opinion regarding sustainable waste management increases. The study concluded with the impression that cognitive processes like education, information and knowledge play a significant role in forming the opinion of the farmers. Therefore, efforts focusing on enhancing cognition should be made for sustainable management of organic waste.
{"title":"Predicting opinion using deep learning: From burning to sustainable management of organic waste in Indian State of Punjab.","authors":"Amandeep Singh, Rupasi Tiwari, Pardeep Singh Nagra, Pratikshya Panda, Gurpreet Kour, Bilawal Singh, Pranav Kumar, Triveni Dutt","doi":"10.1177/0734242X231219627","DOIUrl":"10.1177/0734242X231219627","url":null,"abstract":"<p><p>In winter season, the burning of crop residues for ease of sowing the next crop, along with industrial emissions and vehicular pollution leads to settling of a thick layer of smog in northern part of India. Therefore, to understand the opinion of farmers regarding sustainable management of organic waste, the present study was conducted in Ludhiana district of Indian state of Punjab. An ex post facto research design was used and a total of 800 dairy farmers having significant crop area were selected randomly for the study, grouped equally as small and large dairy farmers. Results revealed that majority of farmers had a highly favourable opinion regarding organic waste management due to the fact that they were aware of the ill-effects of undesirable practices like crop residue burning. Further, to predict the farmers' opinion and the effect of independent variables on farmers' opinion, a multi-layer perceptron feed-forward deep neural network was developed with mean squared error of 0.036 and 0.137 for validation and training data sets respectively, marking a novel approach of analysing farmers' behaviour. The neural network highlighted that with increase in the magnitude of input variables, namely, education, experience in dairying, information source utilisation, knowledge regarding organic waste management, etc., the farmers' opinion regarding sustainable waste management increases. The study concluded with the impression that cognitive processes like education, information and knowledge play a significant role in forming the opinion of the farmers. Therefore, efforts focusing on enhancing cognition should be made for sustainable management of organic waste.</p>","PeriodicalId":23671,"journal":{"name":"Waste Management & Research","volume":" ","pages":"1231-1240"},"PeriodicalIF":3.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11608521/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139075157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}