Pub Date : 2025-01-14DOI: 10.1016/j.clwas.2025.100209
Zubair Hashmi , Ibrahim Maina Idriss , Hussein Taha , Juliana Zaini , Muhammad Saifullah Abu Bakar , Rosnah Abdullah , Asep Bayu Dani Nandianto , Muhammad Roil Bilad
This study investigates the potential of the microalga Chlorococcum sp. for treating real aquaculture wastewater under varying LED light spectra (red, blue, white, violet) and harvesting biomass using polyvinylidene fluoride (PVDF) membranes. Among the tested conditions, red light yielded superior results, achieving 100 % nitrogen removal, 98.77 % phosphorus removal, and 77.21 % COD reduction by the 15th day, alongside the highest biomass production (2.00 ± 0.14 g/L) with the lowest energy consumption (1.08 kWh). Blue light is the next most effective spectra for nutrient removal, while white and violet lights demonstrated moderate performance, consuming 1.80 kWh and 1.62 kWh, respectively. The PVDF membrane exhibited high harvesting efficiency, with flux declining to 125.6 Lm⁻²h⁻¹ at the fourth cycle due to fouling and a flux recovery ratio (FRR) of 1.463 ± 0.078. The operational cost of the peristaltic pump used for harvesting was low, at approximately $0.0965. These findings highlight the efficacy of optimizing light spectra for simultaneous aquaculture wastewater remediation and biomass production, coupled with membrane filtration technology for efficient biomass recovery. This study provides a framework for integrating microalgal cultivation into sustainable wastewater management systems.
{"title":"Cultivation of indigenous Chlorococcum sp. in aquaculture wastewater under various light color and biomass harvesting using membrane filtration: A simultaneous wastewater treatment and biomass production","authors":"Zubair Hashmi , Ibrahim Maina Idriss , Hussein Taha , Juliana Zaini , Muhammad Saifullah Abu Bakar , Rosnah Abdullah , Asep Bayu Dani Nandianto , Muhammad Roil Bilad","doi":"10.1016/j.clwas.2025.100209","DOIUrl":"10.1016/j.clwas.2025.100209","url":null,"abstract":"<div><div>This study investigates the potential of the microalga <em>Chlorococcum</em> sp. for treating real aquaculture wastewater under varying LED light spectra (red, blue, white, violet) and harvesting biomass using polyvinylidene fluoride (PVDF) membranes. Among the tested conditions, red light yielded superior results, achieving 100 % nitrogen removal, 98.77 % phosphorus removal, and 77.21 % COD reduction by the 15th day, alongside the highest biomass production (2.00 ± 0.14 g/L) with the lowest energy consumption (1.08 kWh). Blue light is the next most effective spectra for nutrient removal, while white and violet lights demonstrated moderate performance, consuming 1.80 kWh and 1.62 kWh, respectively. The PVDF membrane exhibited high harvesting efficiency, with flux declining to 125.6 Lm⁻²h⁻¹ at the fourth cycle due to fouling and a flux recovery ratio (FRR) of 1.463 ± 0.078. The operational cost of the peristaltic pump used for harvesting was low, at approximately $0.0965. These findings highlight the efficacy of optimizing light spectra for simultaneous aquaculture wastewater remediation and biomass production, coupled with membrane filtration technology for efficient biomass recovery. This study provides a framework for integrating microalgal cultivation into sustainable wastewater management systems.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"10 ","pages":"Article 100209"},"PeriodicalIF":0.0,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164878","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}
Pub Date : 2025-01-13DOI: 10.1016/j.clwas.2025.100207
Nhlanhla Nyembe, Yusuf M. Isa
The iron- and steelmaking industry generates a substantial amount of waste in the form of blast furnace slag (BFS). Previous studies have highlighted the potential of utilizing BFS, composed of SiO2 and Al2O3, for synthesizing zeolitic materials. However, impurities such as Ca and Mg have been found to hinder the hydrothermal synthesis process by inhibiting zeolite crystallization. To address this, acid leaching of BFS has been proposed as a viable pretreatment method. However, the influence of acid-leaching conditions on the hydrothermal synthesis technique remains unclear. Therefore, the study aims to evaluate the effectiveness of leaching conditions in reducing Ca and Mg from BFS, thereby improving zeolite synthesis from BFS. The BFS under investigation contained significant amounts of SiO2 (35.1 wt%), Al2O3 (16.1 wt%), CaO (30.6 wt%) and MgO (10.5 wt%). The results revealed that the optimal leaching conditions were achieved at a solids concentration of 8 wt%, an HCl concentration of 3 mol/L, and a leaching time of 90 min. Under these conditions, Ca and Mg were successfully solubilized from BFS with a maximum leaching efficiency of 80.4 % and 71.1 %, respectively. X-ray diffraction analysis revealed the mineral phase in the BFS as akermanite, while the products derived from the raw slag and leached slag consisted of augite and zeolite ZSM-5, respectively. It was observed that acid leaching of BFS resulted in a transformation of the mineral phase to augite. The initial composition of CaO and MgO in the starting material significantly influenced the formation of zeolite ZSM-5 during the hydrothermal treatment. With reduced impurities, the leached slag demonstrated successful conversion into zeolite ZSM-5. However, the resultant crystals exhibited a distinctive ball-shaped morphology. The environmental impact of the acidic leachate was minimized by neutralization, ensuring safe disposal and enhancing the sustainability of the leaching process.
{"title":"Acid leaching of blast furnace slag for enhanced zeolite synthesis","authors":"Nhlanhla Nyembe, Yusuf M. Isa","doi":"10.1016/j.clwas.2025.100207","DOIUrl":"10.1016/j.clwas.2025.100207","url":null,"abstract":"<div><div>The iron- and steelmaking industry generates a substantial amount of waste in the form of blast furnace slag (BFS). Previous studies have highlighted the potential of utilizing BFS, composed of SiO<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub>, for synthesizing zeolitic materials. However, impurities such as Ca and Mg have been found to hinder the hydrothermal synthesis process by inhibiting zeolite crystallization. To address this, acid leaching of BFS has been proposed as a viable pretreatment method. However, the influence of acid-leaching conditions on the hydrothermal synthesis technique remains unclear. Therefore, the study aims to evaluate the effectiveness of leaching conditions in reducing Ca and Mg from BFS, thereby improving zeolite synthesis from BFS. The BFS under investigation contained significant amounts of SiO<sub>2</sub> (35.1 wt%), Al<sub>2</sub>O<sub>3</sub> (16.1 wt%), CaO (30.6 wt%) and MgO (10.5 wt%). The results revealed that the optimal leaching conditions were achieved at a solids concentration of 8 wt%, an HCl concentration of 3 mol/L, and a leaching time of 90 min. Under these conditions, Ca and Mg were successfully solubilized from BFS with a maximum leaching efficiency of 80.4 % and 71.1 %, respectively. X-ray diffraction analysis revealed the mineral phase in the BFS as akermanite, while the products derived from the raw slag and leached slag consisted of augite and zeolite ZSM-5, respectively. It was observed that acid leaching of BFS resulted in a transformation of the mineral phase to augite. The initial composition of CaO and MgO in the starting material significantly influenced the formation of zeolite ZSM-5 during the hydrothermal treatment. With reduced impurities, the leached slag demonstrated successful conversion into zeolite ZSM-5. However, the resultant crystals exhibited a distinctive ball-shaped morphology. The environmental impact of the acidic leachate was minimized by neutralization, ensuring safe disposal and enhancing the sustainability of the leaching process.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"10 ","pages":"Article 100207"},"PeriodicalIF":0.0,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164881","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}
Pub Date : 2025-01-09DOI: 10.1016/j.clwas.2024.100196
Lakshmi Parvathi, Dhanya Sathyan, R. Athira
This study explores the benefits of foam concrete, focusing on its lightweight, workability, and thermal resistance, making it suitable for insulation and partition walls. Foam concrete was developed using synthetic and natural foaming agents, with sand replaced by treated coco-peat at 5 %, 7.5 %, and 10 %. Soap nut extract served as a natural foaming agent, and coco-peat was treated with 4 % NaOH for better compatibility. Results showed enhanced thermal insulation with coco-peat, reducing thermal conductivity and lowering interior temperatures by 3 K at 312.15 K external temperature. Sound absorption improved, particularly at 7.5 % and 10 % replacements, while 5 % replacement yielded the highest compressive strength of 19.18 MPa. Although water absorption increased due to coco-peat's properties, durability and acoustic performance improved. Analytical modeling with COMSOL Multiphysics validated these findings, emphasizing its potential in energy-efficient construction.
{"title":"Sustainable Herbo-foam concrete with soap nut and coco-peat: Properties and thermal modelling","authors":"Lakshmi Parvathi, Dhanya Sathyan, R. Athira","doi":"10.1016/j.clwas.2024.100196","DOIUrl":"10.1016/j.clwas.2024.100196","url":null,"abstract":"<div><div>This study explores the benefits of foam concrete, focusing on its lightweight, workability, and thermal resistance, making it suitable for insulation and partition walls. Foam concrete was developed using synthetic and natural foaming agents, with sand replaced by treated coco-peat at 5 %, 7.5 %, and 10 %. Soap nut extract served as a natural foaming agent, and coco-peat was treated with 4 % NaOH for better compatibility. Results showed enhanced thermal insulation with coco-peat, reducing thermal conductivity and lowering interior temperatures by 3 K at 312.15 K external temperature. Sound absorption improved, particularly at 7.5 % and 10 % replacements, while 5 % replacement yielded the highest compressive strength of 19.18 MPa. Although water absorption increased due to coco-peat's properties, durability and acoustic performance improved. Analytical modeling with COMSOL Multiphysics validated these findings, emphasizing its potential in energy-efficient construction.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"10 ","pages":"Article 100196"},"PeriodicalIF":0.0,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164877","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}
Pub Date : 2025-01-09DOI: 10.1016/j.clwas.2025.100206
Yonghong Zhang , Suping Cui , Xinxin Wang , Bohao Yang , Na Zhang , Tao Liu
End-of-Life (EoL) wind turbine blades (WTBs), which pose an environmental problem because of their short service life and lack of proven recycling options, are expected to expand significantly as the wind power industry grows rapidly. Potting's "R strategy" and this study's combined investigation of the recycling and integrated use of solid debris from recycled wind turbine blades (RWTBs) in 3D printed concrete offer a creative and cost-effective way to address this pressing problem. The present priority for handling the waste from wind turbine blades are closely aligned with this approach. The study aims to investigate the feasibility of incorporating RWTB components into 3D printed concrete by utilizing the advantages of this innovative construction technique, which include rapid building, labor and material savings, and the capacity to make intricate structures. Since RWTBs have about double the SiO2 concentration of cement, it has been discovered that adding a suitable amount of SiO2 improves cement hydration and the mechanical qualities of 3D printed concrete. In this study, recycled glass fibers (chopped rGF) and GFRP powder were utilized as cementitious materials, aggregates, and fiber-reinforced components. The results show that GFRP powder, which is produced by mechanical recycling, can be mixed with up to 25 % of the mass of cementitious material without affecting its mechanical strength, printability, extrudability, or buildability. In a similar vein, chopped rGF, which is mechanically recycled, can be utilized as aggregate and reinforcing material up to 20 % of the total volume. Significant integration of RWTB solid waste is demonstrated by the co-doping of chopped rGF and GFRP powder, which can account for up to 20 % of the total mass. By offering a sustainable method for recycling RWTB components in building applications, this research helps to promote the circular economy by reducing the environmental impact of disposing of wind turbine blades.
{"title":"Microstructure and performance of recycled wind turbine blade based 3D printed concrete","authors":"Yonghong Zhang , Suping Cui , Xinxin Wang , Bohao Yang , Na Zhang , Tao Liu","doi":"10.1016/j.clwas.2025.100206","DOIUrl":"10.1016/j.clwas.2025.100206","url":null,"abstract":"<div><div>End-of-Life (EoL) wind turbine blades (WTBs), which pose an environmental problem because of their short service life and lack of proven recycling options, are expected to expand significantly as the wind power industry grows rapidly. Potting's \"R strategy\" and this study's combined investigation of the recycling and integrated use of solid debris from recycled wind turbine blades (RWTBs) in 3D printed concrete offer a creative and cost-effective way to address this pressing problem. The present priority for handling the waste from wind turbine blades are closely aligned with this approach. The study aims to investigate the feasibility of incorporating RWTB components into 3D printed concrete by utilizing the advantages of this innovative construction technique, which include rapid building, labor and material savings, and the capacity to make intricate structures. Since RWTBs have about double the SiO<sub>2</sub> concentration of cement, it has been discovered that adding a suitable amount of SiO<sub>2</sub> improves cement hydration and the mechanical qualities of 3D printed concrete. In this study, recycled glass fibers (chopped rGF) and GFRP powder were utilized as cementitious materials, aggregates, and fiber-reinforced components. The results show that GFRP powder, which is produced by mechanical recycling, can be mixed with up to 25 % of the mass of cementitious material without affecting its mechanical strength, printability, extrudability, or buildability. In a similar vein, chopped rGF, which is mechanically recycled, can be utilized as aggregate and reinforcing material up to 20 % of the total volume. Significant integration of RWTB solid waste is demonstrated by the co-doping of chopped rGF and GFRP powder, which can account for up to 20 % of the total mass. By offering a sustainable method for recycling RWTB components in building applications, this research helps to promote the circular economy by reducing the environmental impact of disposing of wind turbine blades.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"10 ","pages":"Article 100206"},"PeriodicalIF":0.0,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164763","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}
Pub Date : 2025-01-07DOI: 10.1016/j.clwas.2025.100203
Abdalrhman Milad
This paper explores the increasingly popular practice of integrating recycled and upcycled materials in modern architecture and civil engineering and highlights their central role in promoting sustainability, energy efficiency, and environmental responsibility. Upcycling transforms discarded materials, such as reclaimed metal, wood, masonry, glass, concrete, and plastic, into valuable resources and offers a promising course for achieving sustainability. This research evaluates the performance, durability, and aesthetic potential of discarded materials through case studies of completed projects to illustrate their successful applications. It also addresses the challenges and opportunities associated with the widespread use of recycled and upcycled materials by focusing on technological advancements, lifecycle assessments, and economic feasibility. The findings underscore the significance of continued research and innovation in this field and the need for supportive government regulations and better public awareness. In summary, the study emphasizes the compelling need to integrate recycled and upcycled materials in construction to promote sustainable construction practices and develop a more resilient, resource-efficient built environment.
{"title":"Recycled and upcycled materials in contemporary architecture and civil engineering: Their applications, benefits, and challenges","authors":"Abdalrhman Milad","doi":"10.1016/j.clwas.2025.100203","DOIUrl":"10.1016/j.clwas.2025.100203","url":null,"abstract":"<div><div>This paper explores the increasingly popular practice of integrating recycled and upcycled materials in modern architecture and civil engineering and highlights their central role in promoting sustainability, energy efficiency, and environmental responsibility. Upcycling transforms discarded materials, such as reclaimed metal, wood, masonry, glass, concrete, and plastic, into valuable resources and offers a promising course for achieving sustainability. This research evaluates the performance, durability, and aesthetic potential of discarded materials through case studies of completed projects to illustrate their successful applications. It also addresses the challenges and opportunities associated with the widespread use of recycled and upcycled materials by focusing on technological advancements, lifecycle assessments, and economic feasibility. The findings underscore the significance of continued research and innovation in this field and the need for supportive government regulations and better public awareness. In summary, the study emphasizes the compelling need to integrate recycled and upcycled materials in construction to promote sustainable construction practices and develop a more resilient, resource-efficient built environment.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"10 ","pages":"Article 100203"},"PeriodicalIF":0.0,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164765","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}
Pub Date : 2025-01-05DOI: 10.1016/j.clwas.2025.100205
Nazatul Akmal Nazibudin, Siti Afiqah Mohammad Sabri, Latifah Abd Manaf
The Sustainable Development Goal (SDG) 12.3, which aims to cut global food waste at the retail and consumer levels in half by 2030, is in line with Malaysia’s Twelfth Plan (2021–2025). Malaysia is pursuing the planetary goals by executing sustainable procedures to produce primary data on the actual generation of food waste and meet SDG 12.3 aim of tracking food waste management at the national level. The quantification and classification of food waste from various sectors, as well as the identification of food waste compositional analysis and Malaysian food waste management procedures, require more thorough documentation. This research uses a systematic and critical literature review to comprehend the formation of food waste from various sources, besides identifying the important aspects that determine the composition of food waste and the standard protocols for managing food waste in Malaysia. After a thorough search, 20 papers were selected for systematic analysis. The review identified three major issues based on thematic analyses: the source of food waste generation in Malaysia, food waste composition, and food waste management. Upon further analysis, these three core motifs yielded eight subthemes. The article informs policymakers about the existing problems with food waste generation in Malaysia and ideas for achieving sustainability in this area. In order to meet the 2030 Agenda, efforts will be made to empower state governments, authorities, and local communities to reduce food waste generation.
{"title":"Aligning with sustainable development goals (SDG) 12: A systematic review of food waste generation in Malaysia","authors":"Nazatul Akmal Nazibudin, Siti Afiqah Mohammad Sabri, Latifah Abd Manaf","doi":"10.1016/j.clwas.2025.100205","DOIUrl":"10.1016/j.clwas.2025.100205","url":null,"abstract":"<div><div>The Sustainable Development Goal (SDG) 12.3, which aims to cut global food waste at the retail and consumer levels in half by 2030, is in line with Malaysia’s Twelfth Plan (2021–2025). Malaysia is pursuing the planetary goals by executing sustainable procedures to produce primary data on the actual generation of food waste and meet SDG 12.3 aim of tracking food waste management at the national level. The quantification and classification of food waste from various sectors, as well as the identification of food waste compositional analysis and Malaysian food waste management procedures, require more thorough documentation. This research uses a systematic and critical literature review to comprehend the formation of food waste from various sources, besides identifying the important aspects that determine the composition of food waste and the standard protocols for managing food waste in Malaysia. After a thorough search, 20 papers were selected for systematic analysis. The review identified three major issues based on thematic analyses: the source of food waste generation in Malaysia, food waste composition, and food waste management. Upon further analysis, these three core motifs yielded eight subthemes. The article informs policymakers about the existing problems with food waste generation in Malaysia and ideas for achieving sustainability in this area. In order to meet the 2030 Agenda, efforts will be made to empower state governments, authorities, and local communities to reduce food waste generation.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"10 ","pages":"Article 100205"},"PeriodicalIF":0.0,"publicationDate":"2025-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164879","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}
Self-healing concrete has the potential to address the issue of concrete constructions degrading prematurely before their intended lifespan ends. Concrete remains a primary material utilized in the construction sector, encompassing the foundations of buildings, the frameworks of bridges, and subterranean parking facilities. Conventional concrete possesses a deficiency; it is prone to cracking under tensile stress. Bio-concrete has the potential to minimize the costs of maintenance and increase the service life of concrete structures if certain upgrades are incorporated into the material. It presents a viable remedy to the deficiencies of conventional cement-concrete construction and have the capacity to transform our infrastructure development and maintenance. In the present study, dolomite, which is a mineral that is made up of calcium magnesium carbonate, is added to the cement mixture in varying proportions (5 %, 10 %, and 15 % by weight). In addition, Bacillus subtilis bacteria are introduced in different amounts (1 %, 2 %, and 3 %) in order to facilitate the process of self-healing. Additionally, in order to further improve the qualities of the concrete, 5 % glass fiber in the materials was also added. At the ages of three, seven, and twenty-eight days, the compressive strength and split tensile strength of the material were evaluated and analyzed. The incorporation of microorganisms into concrete results in an increase in compressive strength of up to 20.5 % and an increase in split tensile strength of up to 73.29 % over the original specification.
{"title":"Effect of dolomite & glass fiber on properties of self-healing concrete","authors":"Sonal Banchhor , Tarun Kumar Sahu , Kundan Meshram , Umank Mishra , Ashhad Imam","doi":"10.1016/j.clwas.2025.100204","DOIUrl":"10.1016/j.clwas.2025.100204","url":null,"abstract":"<div><div>Self-healing concrete has the potential to address the issue of concrete constructions degrading prematurely before their intended lifespan ends. Concrete remains a primary material utilized in the construction sector, encompassing the foundations of buildings, the frameworks of bridges, and subterranean parking facilities. Conventional concrete possesses a deficiency; it is prone to cracking under tensile stress. Bio-concrete has the potential to minimize the costs of maintenance and increase the service life of concrete structures if certain upgrades are incorporated into the material. It presents a viable remedy to the deficiencies of conventional cement-concrete construction and have the capacity to transform our infrastructure development and maintenance. In the present study, dolomite, which is a mineral that is made up of calcium magnesium carbonate, is added to the cement mixture in varying proportions (5 %, 10 %, and 15 % by weight). In addition, Bacillus subtilis bacteria are introduced in different amounts (1 %, 2 %, and 3 %) in order to facilitate the process of self-healing. Additionally, in order to further improve the qualities of the concrete, 5 % glass fiber in the materials was also added. At the ages of three, seven, and twenty-eight days, the compressive strength and split tensile strength of the material were evaluated and analyzed. The incorporation of microorganisms into concrete results in an increase in compressive strength of up to 20.5 % and an increase in split tensile strength of up to 73.29 % over the original specification.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"10 ","pages":"Article 100204"},"PeriodicalIF":0.0,"publicationDate":"2025-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164876","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}
Pub Date : 2025-01-03DOI: 10.1016/j.clwas.2024.100200
Helena Cotler, Arturo Hernández Márquez, Ana Laura Ramírez Jiménez
The swift expansion of urban areas, combined with inefficient waste collection and processing systems, results in the substantial buildup of complex solid waste, with over 50 % potentially being organic matter. Transforming organic fraction of Municipal Solid Waste (MSW) into compost offers a sustainable approach to simultaneously addressing waste management challenges and enhancing soil fertility. However, the quality of the compost obtained from MSW can be very poor and cause serious problems in agricultural soils. It is therefore worth asking whether the sustainability of the city should be at the expense of the quality of agricultural soils.
The peri-urban area of Mexico City is at the center of this dilemma, where an important food supply comes from this zone and where farmers receive from the government compost produced from MSW. Through semi-structured interviews we identified farmers' perception of compost, its use, benefit and quality in two boroughs in the peri-urban area of Mexico City.
Negative perceptions about the quality of compost, the impact on crops, and the lack of control over compost quality led us to ask what the socio-economic conditions would be for farmers to make their own compost. Through a logistic model we identified the main drivers to on-farm composting such as selling in local markets, having irrigation, being over 60 years old, having a high school education, being a full-time farmer, having a positive experience in using compost, and having traditionally used organic inputs. Public policy should shift improving the waste separation policy from households and increasing the investment in the composting plant to ensure the production of good quality compost. In addition, there will be a need for improvements in technical capacity and economic incentives for producers to do their own composting.
{"title":"Unlocking on-farm composting: Key drivers in Mexico City's peri-urban areas","authors":"Helena Cotler, Arturo Hernández Márquez, Ana Laura Ramírez Jiménez","doi":"10.1016/j.clwas.2024.100200","DOIUrl":"10.1016/j.clwas.2024.100200","url":null,"abstract":"<div><div>The swift expansion of urban areas, combined with inefficient waste collection and processing systems, results in the substantial buildup of complex solid waste, with over 50 % potentially being organic matter. Transforming organic fraction of Municipal Solid Waste (MSW) into compost offers a sustainable approach to simultaneously addressing waste management challenges and enhancing soil fertility. However, the quality of the compost obtained from MSW can be very poor and cause serious problems in agricultural soils. It is therefore worth asking whether the sustainability of the city should be at the expense of the quality of agricultural soils.</div><div>The peri-urban area of Mexico City is at the center of this dilemma, where an important food supply comes from this zone and where farmers receive from the government compost produced from MSW. Through semi-structured interviews we identified farmers' perception of compost, its use, benefit and quality in two boroughs in the peri-urban area of Mexico City.</div><div>Negative perceptions about the quality of compost, the impact on crops, and the lack of control over compost quality led us to ask what the socio-economic conditions would be for farmers to make their own compost. Through a logistic model we identified the main drivers to on-farm composting such as selling in local markets, having irrigation, being over 60 years old, having a high school education, being a full-time farmer, having a positive experience in using compost, and having traditionally used organic inputs. Public policy should shift improving the waste separation policy from households and increasing the investment in the composting plant to ensure the production of good quality compost. In addition, there will be a need for improvements in technical capacity and economic incentives for producers to do their own composting.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"10 ","pages":"Article 100200"},"PeriodicalIF":0.0,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164770","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}
Pub Date : 2025-01-02DOI: 10.1016/j.clwas.2024.100202
I Wayan Koko Suryawan , Mega Mutiara Sari , Ari Rahman , Sapta Suhardono , Thi Thanh Thuy Phan , Chun-Hung Lee
This study explores the factors affecting citizens' willingness to pay (WTP) for e-waste management, particularly concerning data protection for laptops and PCs in Jakarta. Employing a multi-method approach that includes Exploratory Factor Analysis (EFA), cluster analysis, and binary logistic regression, the research identifies significant determinants shaping public attitudes and behaviors regarding e-waste management practices. A total of 567 valid samples were gathered from residents across various districts in Jakarta, ensuring diverse representation. The EFA findings highlighted three main components: passion for data protection, risk perception related to data, and access to recycling and disposal facilities, which together account for a considerable amount of variance in the data. Cluster analysis divided respondents into four distinct groups, revealing different levels of engagement with e-waste management for laptops and PCs. Furthermore, binary logistic regression indicated that a strong commitment to best data protection practices, heightened concern for data security, and improved access to recycling facilities significantly enhance WTP. In contrast, lower income, more frequent laptop/PC replacements, and younger age groups correlate with lower WTP. These results emphasize the necessity of raising public awareness, enhancing infrastructure, and implementing targeted educational and financial initiatives to foster sustainable e-waste management practices for laptops and PCs. The study's findings can guide policy and practical measures aimed at increasing public engagement and support for sustainable e-waste management in urban settings.
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Pub Date : 2024-12-31DOI: 10.1016/j.clwas.2024.100201
Molla Rahman Shaibur , Abu Sayed Al Helal , Abu Bakar Siddique , Humaira Husain , Md. Washim Khan , Sabiha Sarwar , Fariha Farzana , Nazneen Nahar , Md. Sabbir Hossain , Samsul Huda Arpon , Md. Ashik Miah , Sharif Shahara Nova , Kulsuma Akter Priyanka , Farhana Yeasmin , Md. Mirajul Islam , Rabbat Hasan Nishan , Shahriar Rohan Raj , Md Hasanuzzaman , Md Nazmus Sakib
In the dairy farming sector of Bangladesh, cow dung management practices are increasing daily. In this study, proper management of cow dung and its potentiality was analyzed. The utilization of cow dung and its application in biogas generation have been highlighted. Economic gains through cow dung management and its social acceptability were also determined. Cow dung is commonly used as fuel, compost, fish feeding, biogas production, and fresh application in agricultural fields, and some parts are being wasted. The waste part is creating a dirty environment. The total sustainable development index (SDI) for dairy farm waste management was 0.73, indicating a higher level of satisfaction. Effects on traditional fuel sources such as financial benefits and workload reduction through biogas production have been shown. Emphasis has been placed on using bio-slurry (a byproduct of biogas plants) in agriculture for sustainable development. Installation of a biogas plant in a household saved 8.50 kg of firewood day−1 when they were using firewood only for cooking. Similarly, 0.29 kg of petroleum gas was saved day −1 when they were used and its potentiality was also analyzed. It's saved almost 1.67 kg of chemical fertilizer day−1. Above all, the utilization of these target products was examined, and its relation to sustainable development was shown. The total SDI score of bio-slurry waste management was about 0.81, indicating a higher satisfactory level. The findings showed that more than 90 % of households achieved the sustainable development score recommended by FAO sustainable agriculture. Economic analysis of bio-slurry in agriculture showed an average cost-benefit ratio of 3.34, indicating an economically significant outcome. The findings suggested that the management of cow dung and utilization of bio-slurry in agricultural fields helps to maintain sustainable development in the rural communities of Bangladesh, where biogas and bio-slurry utilization is strongly recommended.
{"title":"Cow dung management, biogas production and the uses of bio-slurry for sustainable agriculture","authors":"Molla Rahman Shaibur , Abu Sayed Al Helal , Abu Bakar Siddique , Humaira Husain , Md. Washim Khan , Sabiha Sarwar , Fariha Farzana , Nazneen Nahar , Md. Sabbir Hossain , Samsul Huda Arpon , Md. Ashik Miah , Sharif Shahara Nova , Kulsuma Akter Priyanka , Farhana Yeasmin , Md. Mirajul Islam , Rabbat Hasan Nishan , Shahriar Rohan Raj , Md Hasanuzzaman , Md Nazmus Sakib","doi":"10.1016/j.clwas.2024.100201","DOIUrl":"10.1016/j.clwas.2024.100201","url":null,"abstract":"<div><div>In the dairy farming sector of Bangladesh, cow dung management practices are increasing daily. In this study, proper management of cow dung and its potentiality was analyzed. The utilization of cow dung and its application in biogas generation have been highlighted. Economic gains through cow dung management and its social acceptability were also determined. Cow dung is commonly used as fuel, compost, fish feeding, biogas production, and fresh application in agricultural fields, and some parts are being wasted. The waste part is creating a dirty environment. The total sustainable development index (SDI) for dairy farm waste management was 0.73, indicating a higher level of satisfaction. Effects on traditional fuel sources such as financial benefits and workload reduction through biogas production have been shown. Emphasis has been placed on using bio-slurry (a byproduct of biogas plants) in agriculture for sustainable development. Installation of a biogas plant in a household saved 8.50 kg of firewood day<sup>−1</sup> when they were using firewood only for cooking. Similarly, 0.29 kg of petroleum gas was saved day <sup>−1</sup> when they were used and its potentiality was also analyzed. It's saved almost 1.67 kg of chemical fertilizer day<sup>−1</sup>. Above all, the utilization of these target products was examined, and its relation to sustainable development was shown. The total SDI score of bio-slurry waste management was about 0.81, indicating a higher satisfactory level. The findings showed that more than 90 % of households achieved the sustainable development score recommended by FAO sustainable agriculture. Economic analysis of bio-slurry in agriculture showed an average cost-benefit ratio of 3.34, indicating an economically significant outcome. The findings suggested that the management of cow dung and utilization of bio-slurry in agricultural fields helps to maintain sustainable development in the rural communities of Bangladesh, where biogas and bio-slurry utilization is strongly recommended.</div></div>","PeriodicalId":100256,"journal":{"name":"Cleaner Waste Systems","volume":"10 ","pages":"Article 100201"},"PeriodicalIF":0.0,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164880","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}
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