Organizations can redirect their business models to solve the problem of materials depletion using environmental management and cleaner production as practices of the circular economy. This study aims to measure the relationship between environmental management, cleaner production, and organizational performance. Within this context, a survey of 372 companies was performed in the agro-industrial, manufacturing and construction sectors in three important productive regions of Colombia. Structural Equation Modeling was used for data analysis. The economic sector moderated the relationship between the latent variables. This phenomenon was analyzed using a multi-group technique. The results show that Cleaner production is positively related to Organizational Performance at corporations. The results show that Cleaner production is positively related to Organizational Performance at corporations. It was also observed that Environmental Management influences Cleaner Production. Finally, it is worth noting that productive sectors in Colombia tend to be committed to circular economy practices, some to environmental management and others to cleaner production with an impact on organizational performance. The result of the study may be useful for domestic and foreign investors and managers, for analysts and researchers, and for educators. The rationale behind this is an understanding that interactions between environmental management and cleaner production and organizational performance will influence the academic community or business activity to generate behaviors favoring the environment and sustainable development. These findings will be extremely useful for promoting future research studies on establishing an improved framework for the promotion of environmental management and cleaner production practices primarily among Colombian productive companies. This work can also serve as a reference for other industrial sectors and countries.
{"title":"Environmental Management, Cleaner Production and Organizational Performance: a Structural Approach","authors":"Luciano Barcellos de Paula, Sandra Liliana Palacio Vélez, Hermilson Velásquez Ceballos","doi":"10.5276/jswtm/2021.659","DOIUrl":"https://doi.org/10.5276/jswtm/2021.659","url":null,"abstract":"Organizations can redirect their business models to solve the problem of materials depletion using environmental management and cleaner production as practices of the circular economy. This study aims to measure the relationship between environmental management, cleaner production,\u0000 and organizational performance. Within this context, a survey of 372 companies was performed in the agro-industrial, manufacturing and construction sectors in three important productive regions of Colombia. Structural Equation Modeling was used for data analysis. The economic sector moderated\u0000 the relationship between the latent variables. This phenomenon was analyzed using a multi-group technique. The results show that Cleaner production is positively related to Organizational Performance at corporations. The results show that Cleaner production is positively related to Organizational\u0000 Performance at corporations. It was also observed that Environmental Management influences Cleaner Production. Finally, it is worth noting that productive sectors in Colombia tend to be committed to circular economy practices, some to environmental management and others to cleaner production\u0000 with an impact on organizational performance. The result of the study may be useful for domestic and foreign investors and managers, for analysts and researchers, and for educators. The rationale behind this is an understanding that interactions between environmental management and cleaner\u0000 production and organizational performance will influence the academic community or business activity to generate behaviors favoring the environment and sustainable development. These findings will be extremely useful for promoting future research studies on establishing an improved framework\u0000 for the promotion of environmental management and cleaner production practices primarily among Colombian productive companies. This work can also serve as a reference for other industrial sectors and countries.","PeriodicalId":35783,"journal":{"name":"Journal of Solid Waste Technology and Management","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46389565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Collection of soil samples is labored, time-consuming and the determination of heavy metal concentrations in the laboratory are expensive. The aim of this study was to fix the functions, algorithms as well as optimization of methods for soft computing system such as ANFIS, SVM, and ANN based on their best performance. In this study, soil samples were collected from eighty five distinct locations in and around of a selected open disposal site at old Rajbandh, Khulna, Bangladesh at a depth 0-30 cm from the existing ground surface. In the laboratory, the concentration of heavy metals such as Pb, Cu, Ni, Zn, Co, Cd, As, Sc, Hg, Mn, Cr, Ti, Sb, Sr, V and Ba in soils were measured. The soft computing systems such as ANFIS, SVM, and ANN were implemented for the analysis of heavy metal concentrations in soil. The result reveals model with SCP, gaussmf, linear and hybrid was the best-fitted model of ANFIS. In addition, in SVM analysis, the model SVM-RBF with 15 folds was selected. In ANN, the model LT (Levenberg-Marqardt and Tansig functions) with neuron structure 2-10-1 was selected. The accuracy of the predicted results was checked based on the acceptable limits of prediction parameters such as R value, RMSE, MAPE, GRI and percentage recovery. The result demonstrates that ANFIS model was a reliable technique than that of other counterparts of SVM and ANN with the acceptable degree of robustness and accuracy. Therefore, the performance of soft computing systems may be expressed by the sequence of ANFIS > SVM > ANN. Here it can be noted that one can easily be computed the concentration of a particular heavy metal in soil by inserting GPS values (latitude and longitude) only in the developed rule viewer of ANFIS.
{"title":"Selection of Best Soft Computing Systems for the Analysis of Heavy Metal Concentration in Soils of a Waste Disposal Site in Khulna","authors":"I. M. Rafizul, S. Sarkar","doi":"10.5276/jswtm/2021.627","DOIUrl":"https://doi.org/10.5276/jswtm/2021.627","url":null,"abstract":"Collection of soil samples is labored, time-consuming and the determination of heavy metal concentrations in the laboratory are expensive. The aim of this study was to fix the functions, algorithms as well as optimization of methods for soft computing system such as ANFIS, SVM, and\u0000 ANN based on their best performance. In this study, soil samples were collected from eighty five distinct locations in and around of a selected open disposal site at old Rajbandh, Khulna, Bangladesh at a depth 0-30 cm from the existing ground surface. In the laboratory, the concentration of\u0000 heavy metals such as Pb, Cu, Ni, Zn, Co, Cd, As, Sc, Hg, Mn, Cr, Ti, Sb, Sr, V and Ba in soils were measured. The soft computing systems such as ANFIS, SVM, and ANN were implemented for the analysis of heavy metal concentrations in soil. The result reveals model with SCP, gaussmf, linear and\u0000 hybrid was the best-fitted model of ANFIS. In addition, in SVM analysis, the model SVM-RBF with 15 folds was selected. In ANN, the model LT (Levenberg-Marqardt and Tansig functions) with neuron structure 2-10-1 was selected. The accuracy of the predicted results was checked based on the acceptable\u0000 limits of prediction parameters such as R value, RMSE, MAPE, GRI and percentage recovery. The result demonstrates that ANFIS model was a reliable technique than that of other counterparts of SVM and ANN with the acceptable degree of robustness and accuracy. Therefore, the performance of soft\u0000 computing systems may be expressed by the sequence of ANFIS > SVM > ANN. Here it can be noted that one can easily be computed the concentration of a particular heavy metal in soil by inserting GPS values (latitude and longitude) only in the developed rule viewer of ANFIS.","PeriodicalId":35783,"journal":{"name":"Journal of Solid Waste Technology and Management","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70940753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Y. Oyeyiola, E. A. Ewetola, O. Olaitan, M. I. Arogundade
Harnessing the high macronutrient in poultry manure (PM) for enhanced biochar yield (BY) and quality through blending with Gmelina arborea sawdust (SD) or Tithonia diversifolia shoot (TD) at slow pyrolysis (350 °C) heating regimes (HRs) was the focus of this work. Twelve biochars were produced from SD and TD with or without PM at three slow pyrolysis HRs of 5, 10 and 20 minutes in completely randomized design with three replications. Dominant biochar parameters contributing to BY and ash content were reported. Results indicated PM spiking and HR significantly (p < 0.001) improved BY and nutrient quality irrespective of plant biomass type. The BY increased by 107% (5 min HR) and 79% (10 min HR) with PM spiking while ash content increased with increasing HR by 599 and 305% following PM spiking in TD and SD respectively. 20 and 10 minute HRs enhanced N and P contents in SD and TD biochar respectively. PM spiking and increasing HR from 10 to 20 minutes reduced biochar organic C by 159% in TD biochar. Reduced organic C, C/N and C/P dominantly influenced BY and ash content. PM when appropriately bulked with SD and TD produces higher BY and quality under slow pyrolysis condition.
在慢热解(350°C)加热条件下，利用禽粪(PM)中的高常量营养素，通过与绿木屑(SD)或绿叶铁(TD)混合，提高生物炭产量(BY)和质量是本研究的重点。采用完全随机设计，3个重复，以添加或不添加PM的SD和TD为原料，分别在5、10和20分钟的慢热解时间下制得12个生物炭。报告了影响BY和灰分含量的主要生物炭参数。结果表明，无论生物量类型如何，PM灌穗和HR均显著提高了生物量和养分质量(p < 0.001)。施用PM后，TD和SD的利用率分别提高了107% (5 min HR)和79% (10 min HR)，灰分含量则分别提高了599%和305% (HR增加)。20和10 min hr分别提高了SD和TD生物炭的N和P含量。PM峰值和HR从10分钟增加到20分钟，使TD生物炭的有机碳减少了159%。降低的有机碳、碳氮比和碳磷比主要受灰分含量的影响。在慢热解条件下，适当添加SD和TD的PM可获得更高的BY和质量。
{"title":"Biochar Yield and Quality Enhancement by Poultry Manure Spiking at Varied Slow Pyrolysis Heating Regimes","authors":"Y. Oyeyiola, E. A. Ewetola, O. Olaitan, M. I. Arogundade","doi":"10.5276/jswtm/2021.705","DOIUrl":"https://doi.org/10.5276/jswtm/2021.705","url":null,"abstract":"Harnessing the high macronutrient in poultry manure (PM) for enhanced biochar yield (BY) and quality through blending with Gmelina arborea sawdust (SD) or Tithonia diversifolia shoot (TD) at slow pyrolysis (350 °C) heating regimes (HRs) was the focus of this work.\u0000 Twelve biochars were produced from SD and TD with or without PM at three slow pyrolysis HRs of 5, 10 and 20 minutes in completely randomized design with three replications. Dominant biochar parameters contributing to BY and ash content were reported. Results indicated PM spiking and HR significantly\u0000 (p < 0.001) improved BY and nutrient quality irrespective of plant biomass type. The BY increased by 107% (5 min HR) and 79% (10 min HR) with PM spiking while ash content increased with increasing HR by 599 and 305% following PM spiking in TD and SD respectively. 20 and 10 minute\u0000 HRs enhanced N and P contents in SD and TD biochar respectively. PM spiking and increasing HR from 10 to 20 minutes reduced biochar organic C by 159% in TD biochar. Reduced organic C, C/N and C/P dominantly influenced BY and ash content. PM when appropriately bulked with SD and TD produces\u0000 higher BY and quality under slow pyrolysis condition.","PeriodicalId":35783,"journal":{"name":"Journal of Solid Waste Technology and Management","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42773512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The soil water characteristics play an important role in predicting the engineering behaviour of unsaturated soils. An experimental programme was performed using pressure plate apparatus to investigate the effect of moulding water content, compactive effort and cycles of wetting and drying on Soil Water Characteristic Curves (SWCC) of compacted marine clay. The specimens were prepared with moulding water contents (optimum, dry of optimum and wet of optimum) for both Standard Proctor and Modified Proctor compactive efforts. The results obtained were fitted to Brooks and Corey (BC) and Van Genuchten (VG) models. The study indicated that SWCC for specimens with higher compactive efforts plotted above those with lower compactive efforts. It was observed that the variation in moulding water content had no significant effect in the resulting SWCC. With the increase in the number of cycles of wetting and drying, a decrease in the water retention capacity was observed.
{"title":"Soil Water Characteristic Curves of Compacted Marine Clay","authors":"V. Veena, S. Cyrus, B. M. Abraham, B. T. Jose","doi":"10.5276/jswtm/2021.717","DOIUrl":"https://doi.org/10.5276/jswtm/2021.717","url":null,"abstract":"The soil water characteristics play an important role in predicting the engineering behaviour of unsaturated soils. An experimental programme was performed using pressure plate apparatus to investigate the effect of moulding water content, compactive effort and cycles of wetting and\u0000 drying on Soil Water Characteristic Curves (SWCC) of compacted marine clay. The specimens were prepared with moulding water contents (optimum, dry of optimum and wet of optimum) for both Standard Proctor and Modified Proctor compactive efforts. The results obtained were fitted to Brooks and\u0000 Corey (BC) and Van Genuchten (VG) models. The study indicated that SWCC for specimens with higher compactive efforts plotted above those with lower compactive efforts. It was observed that the variation in moulding water content had no significant effect in the resulting SWCC. With the increase\u0000 in the number of cycles of wetting and drying, a decrease in the water retention capacity was observed.","PeriodicalId":35783,"journal":{"name":"Journal of Solid Waste Technology and Management","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48576117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Consumer attitudes toward e-waste management systems were studied by questionnaire surveys of residents from two villages selected in each of Thailand, Vietnam, Japan, and China. Villagers from Japan scored highest in having a positive attitude toward extracting gold from e-waste for Tokyo Olympics medals. The attitude of the villagers from Kamikatsu, Japan was consistently more willing to support and volunteer to improve their environment than that from Tokushima; but more resistant to involvement in improper e-waste dumping and having solutions to the problem. Similar attitudes were also found in the villagers of Hong Ren Old Village and New Village, China. Among the villages with the e-waste management practice, the villagers of Bui Village (Vietnam) and Hong Ren Old Village have demonstrated more of their positive attitudes than those of Kamikatsu and Village #3 (Thailand) toward improving their environment, satisfying with e-waste-related laws, and supporting for extracting precious metals from e-waste. Among the villages not adopting the e-waste management practice, however, the villagers of Duong Xa (Vietnam) demonstrated the highest positive attitudes in their satisfaction with e-waste-related laws, and led with Village #5 (Thailand) and Tokushima in their commitment to improving the environment and support for extracting precious metals from e-waste.
{"title":"Consumer Attitudes Toward E-waste Reuse and Recycling in Selected Villages in Thailand, Vietnam, Japan, and China","authors":"Li Liang","doi":"10.5276/jswtm/2021.696","DOIUrl":"https://doi.org/10.5276/jswtm/2021.696","url":null,"abstract":"Consumer attitudes toward e-waste management systems were studied by questionnaire surveys of residents from two villages selected in each of Thailand, Vietnam, Japan, and China. Villagers from Japan scored highest in having a positive attitude toward extracting gold from e-waste for\u0000 Tokyo Olympics medals. The attitude of the villagers from Kamikatsu, Japan was consistently more willing to support and volunteer to improve their environment than that from Tokushima; but more resistant to involvement in improper e-waste dumping and having solutions to the problem. Similar\u0000 attitudes were also found in the villagers of Hong Ren Old Village and New Village, China. Among the villages with the e-waste management practice, the villagers of Bui Village (Vietnam) and Hong Ren Old Village have demonstrated more of their positive attitudes than those of Kamikatsu and\u0000 Village #3 (Thailand) toward improving their environment, satisfying with e-waste-related laws, and supporting for extracting precious metals from e-waste. Among the villages not adopting the e-waste management practice, however, the villagers of Duong Xa (Vietnam) demonstrated the highest\u0000 positive attitudes in their satisfaction with e-waste-related laws, and led with Village #5 (Thailand) and Tokushima in their commitment to improving the environment and support for extracting precious metals from e-waste.","PeriodicalId":35783,"journal":{"name":"Journal of Solid Waste Technology and Management","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47705975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
W. Porto, Maurício Assuero Lima de Freitas, Alexandre Stamford da Silva
Objective: To demonstrate the implications of the growth of e-waste, within the traditional conception of the Linear Economy, over time, and to deduce the potential reaction of society, by defining the model of its time of impatience. Method: For the development of the research, the logistic model of differential equations (Verhulst, 1838) and a theoretical model of finite difference equations associated with an empirical model of log-linear regression were used to analyze the growth prospects of e-waste, over time, when technological advances are estimated, as well as the potential reaction of society. Main results: The results show that there is a point of impatience in society that can be measured, as long as the specificities of each type of e-waste are known; and that the volume of e-waste grows exponentially over time, being influenced, in part, by the evolution of technology, considering the electronic products made available to society as a proxy, which is driven to consume, among other motivations, by functional obsolescence. Relevance/Originality: The results are important because they indicate that if there are no more rigid, efficient and effective regulatory measures, and if there is no paradigm shift in the production system, from extraction to final destination, there is likely to be a collapse in drainage systems, treatment and final disposal of e-waste on a global scale, with severe consequences for ecosystems, health, economic and social systems, greatly increasing our ecological footprint, thereby threatening the maintenance of life on Earth. Theoretical/methodological contributions: The study contributes to the understanding of the behavior of e-waste and the influence of technology on its growth, as well as to the logical deduction of the society's point of impatience regarding the use of the materials that generate e-waste, reinforcing the originality of the research and promoting a deeper understanding of the topic.
{"title":"Dynamics of the E-Waste Behavior Globally","authors":"W. Porto, Maurício Assuero Lima de Freitas, Alexandre Stamford da Silva","doi":"10.5276/jswtm/2021.425","DOIUrl":"https://doi.org/10.5276/jswtm/2021.425","url":null,"abstract":"Objective: To demonstrate the implications of the growth of e-waste, within the traditional conception of the Linear Economy, over time, and to deduce the potential reaction of society, by defining the model of its time of impatience. Method: For the development\u0000 of the research, the logistic model of differential equations (Verhulst, 1838) and a theoretical model of finite difference equations associated with an empirical model of log-linear regression were used to analyze the growth prospects of e-waste, over time, when technological advances are\u0000 estimated, as well as the potential reaction of society. Main results: The results show that there is a point of impatience in society that can be measured, as long as the specificities of each type of e-waste are known; and that the volume of e-waste grows exponentially\u0000 over time, being influenced, in part, by the evolution of technology, considering the electronic products made available to society as a proxy, which is driven to consume, among other motivations, by functional obsolescence. Relevance/Originality: The results are important\u0000 because they indicate that if there are no more rigid, efficient and effective regulatory measures, and if there is no paradigm shift in the production system, from extraction to final destination, there is likely to be a collapse in drainage systems, treatment and final disposal of e-waste\u0000 on a global scale, with severe consequences for ecosystems, health, economic and social systems, greatly increasing our ecological footprint, thereby threatening the maintenance of life on Earth. Theoretical/methodological contributions: The study contributes to the understanding\u0000 of the behavior of e-waste and the influence of technology on its growth, as well as to the logical deduction of the society's point of impatience regarding the use of the materials that generate e-waste, reinforcing the originality of the research and promoting a deeper understanding of the\u0000 topic.","PeriodicalId":35783,"journal":{"name":"Journal of Solid Waste Technology and Management","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46570705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Celma Duque Ferreira, Gilberto Crispim, L. Flach, Fabricia Silva da Rosa, Luísa Karam de Mattos
This study aims to analyze the endogenous variables that influence the solid waste management in Brazil. Applying a two-stage data envelopment analysis model, the study encourages discussion on the management of municipal solid waste in developing countries. In addition, this research contributes to the evaluation of efficient public resources, analyzes the efficiency of public spending and distinct aspects regarding how municipalities operate and optimize resources. Results show that the coefficients provide strong evidence that efficiency is affected by the form of waste management and corroborates the literature that highlights this relationship. The results provide insight into the structure of the solid waste collection function, and that preliminarily provides the possibility of analyzing the benchmark identification.
{"title":"Efficiency of Public Spending in Solid Waste Management: Analyzing Distinct Aspects of How Municipalities Operate and Optimize Resources","authors":"Celma Duque Ferreira, Gilberto Crispim, L. Flach, Fabricia Silva da Rosa, Luísa Karam de Mattos","doi":"10.5276/jswtm/2021.438","DOIUrl":"https://doi.org/10.5276/jswtm/2021.438","url":null,"abstract":"This study aims to analyze the endogenous variables that influence the solid waste management in Brazil. Applying a two-stage data envelopment analysis model, the study encourages discussion on the management of municipal solid waste in developing countries. In addition, this research\u0000 contributes to the evaluation of efficient public resources, analyzes the efficiency of public spending and distinct aspects regarding how municipalities operate and optimize resources. Results show that the coefficients provide strong evidence that efficiency is affected by the form of waste\u0000 management and corroborates the literature that highlights this relationship. The results provide insight into the structure of the solid waste collection function, and that preliminarily provides the possibility of analyzing the benchmark identification.","PeriodicalId":35783,"journal":{"name":"Journal of Solid Waste Technology and Management","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45645710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Larissa Granjeiro Lucena, Nathália Aquino de Carvalho, Inalmar D. Barbosa Segundo, Maria Marcella Medeiros Melo, Arthur Marinho Cahino, E. M. Rocha
The high polluting potential and variable content of the landfill leachate makes it a significant source of environmental contamination. Advanced oxidation processes (AOPs) such as Fenton process, arises as leachate treatment. Application of response surface methodology (RSM) from previous literatures evaluates the synergistic effects of independent variables to optimize the Fenton process. This paper presents systematic review on articles published from 2005 to 2015 reported on optimum conditions of Fenton treatment landfill leachate treatment using RSM. Papers were selected from different database according to defined inclusion criteria and then, evaluated. The best conditions identified were: pH around 3, [H2O2]/[Fe2+] molar ratio from 2.38 to 24.00, [H2O2]/[CODraw leachate] mass ratio around 1 and reaction time from 30 min to 331.2 min. All models presented R2 > 0.75, indicating a good correlation between the experimental data and the values predicted by the models.
{"title":"A Systematic Review on Fenton Optimization for Leachate Treatment Via Response Surface Methodology from 2005 to 2015","authors":"Larissa Granjeiro Lucena, Nathália Aquino de Carvalho, Inalmar D. Barbosa Segundo, Maria Marcella Medeiros Melo, Arthur Marinho Cahino, E. M. Rocha","doi":"10.5276/jswtm/2021.409","DOIUrl":"https://doi.org/10.5276/jswtm/2021.409","url":null,"abstract":"The high polluting potential and variable content of the landfill leachate makes it a significant source of environmental contamination. Advanced oxidation processes (AOPs) such as Fenton process, arises as leachate treatment. Application of response surface methodology (RSM) from previous\u0000 literatures evaluates the synergistic effects of independent variables to optimize the Fenton process. This paper presents systematic review on articles published from 2005 to 2015 reported on optimum conditions of Fenton treatment landfill leachate treatment using RSM. Papers were selected\u0000 from different database according to defined inclusion criteria and then, evaluated. The best conditions identified were: pH around 3, [H2O2]/[Fe2+] molar ratio from 2.38 to 24.00, [H2O2]/[CODraw leachate] mass ratio around\u0000 1 and reaction time from 30 min to 331.2 min. All models presented R2 > 0.75, indicating a good correlation between the experimental data and the values predicted by the models.","PeriodicalId":35783,"journal":{"name":"Journal of Solid Waste Technology and Management","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45779496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The objectives of this project are to evaluate the effect of water reducing admixtures and construction variability in concrete mixtures containing recycled concrete aggregate (RCA). A concrete mix that was approved for curbs and sidewalks in the State of Florida was selected. Based on the analysis conducted, it was found that properties of the RCA were comparable to the virgin aggregate used in this project. However, the absorption of the RCA was double as compared to the limestone. Although the compressive strength of the virgin mix was decreased by 19% when RCA was introduced into the mix, both mixes met the target strength (17.2 MPa). Admixture has a significant impact on all the mixes, especially on mixes that contained RCA. When admixture was omitted, the 28-day compressive strength dropped to nearly 55% on the mixture containing RCA. In addition, the RCA mix without the admixture did not reach the target strength at 28 days. Similarly, construction variability has a significant effect on the compressive strength of the mixes. When the RCA content was increased by 15% and 25% respectively, the concrete paste was weak. These mixtures did not meet the target strength at 28 days.
{"title":"Effect of Water Reducing Admixtures and Construction Variability in Concrete Containing Recycled Aggregate Concrete","authors":"C. Villiers","doi":"10.5276/jswtm/2021.456","DOIUrl":"https://doi.org/10.5276/jswtm/2021.456","url":null,"abstract":"The objectives of this project are to evaluate the effect of water reducing admixtures and construction variability in concrete mixtures containing recycled concrete aggregate (RCA). A concrete mix that was approved for curbs and sidewalks in the State of Florida was selected. Based\u0000 on the analysis conducted, it was found that properties of the RCA were comparable to the virgin aggregate used in this project. However, the absorption of the RCA was double as compared to the limestone. Although the compressive strength of the virgin mix was decreased by 19% when RCA was\u0000 introduced into the mix, both mixes met the target strength (17.2 MPa). Admixture has a significant impact on all the mixes, especially on mixes that contained RCA. When admixture was omitted, the 28-day compressive strength dropped to nearly 55% on the mixture containing RCA. In addition,\u0000 the RCA mix without the admixture did not reach the target strength at 28 days. Similarly, construction variability has a significant effect on the compressive strength of the mixes. When the RCA content was increased by 15% and 25% respectively, the concrete paste was weak. These mixtures\u0000 did not meet the target strength at 28 days.","PeriodicalId":35783,"journal":{"name":"Journal of Solid Waste Technology and Management","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42822718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Chinenyenwa, Nik Daud Nik Norsyhariati, I. Syazwani, C. M. Hasfalina
The increasing solid waste management problems in developing countries necessitated landfill mining to determine the reuse potentials of landfilled solid waste materials. In this study, characterization of landfilled solid waste obtained from a closed landfill site in Malaysia was conducted to ascertain its reuse potentials for biodegradation in wastewater treatment. The results revealed adequate neutral pH, Moisture Content of 34 %, Organic Content of 10.4 % and Bacterial Population in terms of Total Coliform of 8.3 × 105 CFU/100 mL, which are ideal conditions for biodegradation while porosity n of 51%, allow free flow of water during treatment. The SEM showed irregular shapes and pore spaces and a BET surface area of 3.376 m 2 g-1 which enables adsorption of pollutants on its surface, air diffusion and re-aeration. Furthermore, the waste material was used as media for biodegradation in a lab-scale bioreactor at a hydraulic loading of 4 L m-3 d-1 and inflow rate of 0.1 L min-1. The results showed maximum removal rates of 95, 97, 86, 70, 70, and 98% for COD, BOD, TSS, TDS, NH3-N, and TP respectively. Utilization of this technology as bioreactor landfills will solve landfill congestion and also provide cheap wastewater treatment option.
发展中国家固体废物管理问题日益严重，因此必须进行填埋采矿，以确定填埋固体废物的再利用潜力。在这项研究中，从马来西亚一个封闭的垃圾填埋场获得的垃圾填埋固体废物进行了表征，以确定其在废水处理中生物降解的再利用潜力。结果表明，适宜的中性pH、水分含量为34%、有机物含量为10.4%、总大肠菌群8.3 × 105 CFU/100 mL是生物降解的理想条件，而孔隙率为51%，可使水在处理过程中自由流动。扫描电镜显示出不规则的形状和孔隙空间，BET表面积为3.376 m2 g-1，有利于污染物在其表面的吸附、空气扩散和再曝气。此外，在实验室规模的生物反应器中，以4 L m-3 d-1的水力负荷和0.1 L min-1的进水速率作为生物降解的介质。结果表明，对COD、BOD、TSS、TDS、NH3-N和TP的去除率分别为95%、97%、86%、70%、70%和98%。利用该技术作为生物反应器填埋将解决垃圾填埋场拥挤问题，并提供廉价的废水处理选择。
{"title":"Analyzing the Reuse Potentials of Landfilled Solid Wastes for Farm Water Treatment and Reuse","authors":"A. Chinenyenwa, Nik Daud Nik Norsyhariati, I. Syazwani, C. M. Hasfalina","doi":"10.5276/jswtm/2021.417","DOIUrl":"https://doi.org/10.5276/jswtm/2021.417","url":null,"abstract":"The increasing solid waste management problems in developing countries necessitated landfill mining to determine the reuse potentials of landfilled solid waste materials. In this study, characterization of landfilled solid waste obtained from a closed landfill site in Malaysia was conducted\u0000 to ascertain its reuse potentials for biodegradation in wastewater treatment. The results revealed adequate neutral pH, Moisture Content of 34 %, Organic Content of 10.4 % and Bacterial Population in terms of Total Coliform of 8.3 × 105 CFU/100 mL, which are ideal conditions\u0000 for biodegradation while porosity n of 51%, allow free flow of water during treatment. The SEM showed irregular shapes and pore spaces and a BET surface area of 3.376 m 2 g-1 which enables adsorption of pollutants on its surface, air diffusion and re-aeration. Furthermore,\u0000 the waste material was used as media for biodegradation in a lab-scale bioreactor at a hydraulic loading of 4 L m-3 d-1 and inflow rate of 0.1 L min-1. The results showed maximum removal rates of 95, 97, 86, 70, 70, and 98% for COD, BOD, TSS, TDS, NH3-N,\u0000 and TP respectively. Utilization of this technology as bioreactor landfills will solve landfill congestion and also provide cheap wastewater treatment option.","PeriodicalId":35783,"journal":{"name":"Journal of Solid Waste Technology and Management","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44171345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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