Subrata Hait - Academia.edu (original) (raw)
Papers by Subrata Hait
CRC Press eBooks, Mar 9, 2023
Environmental Monitoring and Assessment
Antimony (Sb) has been classified as a high-priority contaminant in the environment. Sb contamina... more Antimony (Sb) has been classified as a high-priority contaminant in the environment. Sb contamination resulting from the use of antimony containing compounds in industry necessitates the development of efficient methods to remove it from water and wastewater. Adsorption is a highly efficient and reliable method for pollutants removal owing to its availability, recyclability, and low cost. Recently, carbonaceous materials and their applications for the removal of Sb from the aqueous matrices have received special attention worldwide. Herein, this review systematically summarizes the occurrence and exposure of Sb in the environment and on human health, respectively. Different carbon-based adsorbents have been classified for the adsorptive removal of Sb and their adsorption characteristics have been delineated. Recent development in the adsorption performance of the adsorbent materials for improving the Sb removal from the aqueous medium has been outlined. Further, to develop an understanding of the effect of different parameters like pH, competitive ions, and dissolved ions for Sb adsorption and subsequent removal have been discussed. A retrospective analysis of literature was conducted to present the adsorption behavior and underlying mechanisms involved in the removal of Sb using various adsorbents. Moreover, this study has identified emerging research gaps and emphasized the need for developing modified/engineered carbonaceous adsorbents to enhance Sb adsorption from various aqueous matrices.
Journal of Hazardous Materials, Sep 1, 2023
International Journal of Waste Resources, Oct 5, 2017
Waste Management and Resource Efficiency, 2018
Toxicity characterization (TC) tests for solid waste have proven to be indispensable characteriza... more Toxicity characterization (TC) tests for solid waste have proven to be indispensable characterization tools for estimation of environmental threat. These tests mimic the fate of solid waste in environmental conditions and provide relevant information about the leaching behaviour of metals in natural conditions based on which they are categorized as toxic. In view of this, the aim of this paper is to identify the leaching assessment on six heavy metals, namely As, Ba, Cd, Ni, Pb and Se from waste printed circuit boards (PCBs) of obsolete electrical and electronic equipment (EEE) that are computer, laptop, washing machine (WM), television (TV) and air conditioner (AC) adopting two TC tests, namely toxicity characteristic leaching procedure (TCLP) and synthetic precipitation leaching procedure (SPLP) which simulate solid waste leaching in several dumping scenarios and metal mobility potential of solid waste dumped in situ, in or on the ground, exposed to acid rain, respectively. TC res...
Process Safety and Environmental Protection
Frontiers in Energy Research, Apr 18, 2023
Global E-Waste Management Strategies and Future Implications
Water Emerging Contaminants & Nanoplastics
MPs act as carriers of organic pollutants, including per- and polyfluoroalkyl substances (PFASs) ... more MPs act as carriers of organic pollutants, including per- and polyfluoroalkyl substances (PFASs) in aquatic environments and exhibit harmful effects on organisms. Although there has been extensive research on the abundance and distribution MPs and PFASs individually, their co-occurrence and combined ecotoxicological effects have been poorly understood. In this context, the present review aims to present an up-to-date understanding of PFAS sorption onto MPs and their bioaccumulation in different organisms. The combined sources and prevalence of MPs and PFASs are summarized, with some daily-use products identified as important sources of both pollutants. MPs occurrence indicates considerable diversity in their levels, with concentrations ranging from 0-7 particles/m3 (air), 1-4712 particles/kg (soil), 1-26 particles/L (aquatic matrices), and 0-199 particles/organism (species) worldwide. Further, the literature survey provides evidence of PFAS concentrations ranging from < 0.0011 to...
Journal of Environmental Management
Journal of Environment Quality
Waste Management
Comprehensive characterization of printed circuit board (PCB) of end-of-life electrical and elect... more Comprehensive characterization of printed circuit board (PCB) of end-of-life electrical and electronic equipment (EEE) is obligatory for prospective profitable beneficiation. In this study, beneficiation oriented comprehensive characterization of two brands of PCBs each of 16 end-of-life EEE was conducted in terms of their physicochemical characteristics with special emphasis on the content of 16 general elements, 2 precious metals and 15 rare earth elements (REEs). General elements and their highest weight percent composition found in different PCBs of the EEEs were Cu (23% in laptop), Al (6% in computer), Pb (15% in DVD player) and Ba (7% in TV). The high abundant of precious metals such as Au (316 g/ton) and Ag (636 g/ton) in mobile phone and laptop, respectively coupled with rapid obsolescence age makes waste PCBs of information technology and telecommunication equipment the most potent resource reservoir. Additionally, most of the waste PCBs were observed to contain REEs in considerable quantity with Sc up to 31 g/ton and Ce up to 13 g/ton being the major constituents. Comprehensive characterization of waste PCBs therefore will systematically help towards better understanding of e-waste recycling processes for beneficiation purpose and sustainable resource circulation and conservation.
Materials Chemistry and Physics
Progress and Recent Trends in Microbial Fuel Cells
Process Safety and Environmental Protection
RSC Adv.
Sulfonated low density polyethylenes (LDPEs) in varied molar ratios have been analyzed as separat... more Sulfonated low density polyethylenes (LDPEs) in varied molar ratios have been analyzed as separating barriers in microbial fuel cells (MFCs) for bioelectricity production.
Waste Management
There has been a significant rise in municipal solid waste (MSW) generation in the last few decad... more There has been a significant rise in municipal solid waste (MSW) generation in the last few decades due to rapid urbanization and industrialization. Due to the lack of source segregation practice, a need for automated segregation of recyclables from MSW exists in the developing countries. This paper reports a thermal imaging based system for classifying useful recyclables from simulated MSW sample. Experimental results have demonstrated the possibility to use thermal imaging technique for classification and a robotic system for sorting of recyclables in a single process step. The reported classification system yields an accuracy in the range of 85-96% and is comparable with the existing single-material recyclable classification techniques. We believe that the reported thermal imaging based system can emerge as a viable and inexpensive large-scale classification-cum-sorting technology in recycling plants for processing MSW in developing countries.
Process Safety and Environmental Protection
Abstract Vermicomposting process employing earthworms is increasingly being used for conversion o... more Abstract Vermicomposting process employing earthworms is increasingly being used for conversion of both municipal and industrial wastes to vermicast with reduced metals content. The aim of the paper is to review recent developments and approaches for determination of bioavailable metal fractions through speciation and consequently the fate of both essential and xenobiotic heavy metals during vermicomposting of various organic wastes. The review also provides a comprehensive summary on the occurrence of heavy metals in wastes vis-a-vis metals standards worldwide and the process efficacy in limiting the mobility of heavy metals. Past and present researches demonstrated a high-degree of agreement that vermicomposting results in effective reduction of both total and bioavailable metal contents owing to the formation of stable metal complexes and/or silicate fractions. Further, it has been concurred that earthworms and associated microbial communities during vermicomposting tend to decrease the mobility of metals by enhancing enzymatic activities in both gut- and cast-associated processes. In addition, the decrease in total metal content has been attributed to accumulation and immobilization of mobile metal fractions in earthworm tissues. In summary, it can be inferred that vermicomposting potentially converts various municipal and industrial wastes to nutrients-rich organic manure for agronomic applications with reduced metals bioavailability.
CRC Press eBooks, Mar 9, 2023
Environmental Monitoring and Assessment
Antimony (Sb) has been classified as a high-priority contaminant in the environment. Sb contamina... more Antimony (Sb) has been classified as a high-priority contaminant in the environment. Sb contamination resulting from the use of antimony containing compounds in industry necessitates the development of efficient methods to remove it from water and wastewater. Adsorption is a highly efficient and reliable method for pollutants removal owing to its availability, recyclability, and low cost. Recently, carbonaceous materials and their applications for the removal of Sb from the aqueous matrices have received special attention worldwide. Herein, this review systematically summarizes the occurrence and exposure of Sb in the environment and on human health, respectively. Different carbon-based adsorbents have been classified for the adsorptive removal of Sb and their adsorption characteristics have been delineated. Recent development in the adsorption performance of the adsorbent materials for improving the Sb removal from the aqueous medium has been outlined. Further, to develop an understanding of the effect of different parameters like pH, competitive ions, and dissolved ions for Sb adsorption and subsequent removal have been discussed. A retrospective analysis of literature was conducted to present the adsorption behavior and underlying mechanisms involved in the removal of Sb using various adsorbents. Moreover, this study has identified emerging research gaps and emphasized the need for developing modified/engineered carbonaceous adsorbents to enhance Sb adsorption from various aqueous matrices.
Journal of Hazardous Materials, Sep 1, 2023
International Journal of Waste Resources, Oct 5, 2017
Waste Management and Resource Efficiency, 2018
Toxicity characterization (TC) tests for solid waste have proven to be indispensable characteriza... more Toxicity characterization (TC) tests for solid waste have proven to be indispensable characterization tools for estimation of environmental threat. These tests mimic the fate of solid waste in environmental conditions and provide relevant information about the leaching behaviour of metals in natural conditions based on which they are categorized as toxic. In view of this, the aim of this paper is to identify the leaching assessment on six heavy metals, namely As, Ba, Cd, Ni, Pb and Se from waste printed circuit boards (PCBs) of obsolete electrical and electronic equipment (EEE) that are computer, laptop, washing machine (WM), television (TV) and air conditioner (AC) adopting two TC tests, namely toxicity characteristic leaching procedure (TCLP) and synthetic precipitation leaching procedure (SPLP) which simulate solid waste leaching in several dumping scenarios and metal mobility potential of solid waste dumped in situ, in or on the ground, exposed to acid rain, respectively. TC res...
Process Safety and Environmental Protection
Frontiers in Energy Research, Apr 18, 2023
Global E-Waste Management Strategies and Future Implications
Water Emerging Contaminants & Nanoplastics
MPs act as carriers of organic pollutants, including per- and polyfluoroalkyl substances (PFASs) ... more MPs act as carriers of organic pollutants, including per- and polyfluoroalkyl substances (PFASs) in aquatic environments and exhibit harmful effects on organisms. Although there has been extensive research on the abundance and distribution MPs and PFASs individually, their co-occurrence and combined ecotoxicological effects have been poorly understood. In this context, the present review aims to present an up-to-date understanding of PFAS sorption onto MPs and their bioaccumulation in different organisms. The combined sources and prevalence of MPs and PFASs are summarized, with some daily-use products identified as important sources of both pollutants. MPs occurrence indicates considerable diversity in their levels, with concentrations ranging from 0-7 particles/m3 (air), 1-4712 particles/kg (soil), 1-26 particles/L (aquatic matrices), and 0-199 particles/organism (species) worldwide. Further, the literature survey provides evidence of PFAS concentrations ranging from < 0.0011 to...
Journal of Environmental Management
Journal of Environment Quality
Waste Management
Comprehensive characterization of printed circuit board (PCB) of end-of-life electrical and elect... more Comprehensive characterization of printed circuit board (PCB) of end-of-life electrical and electronic equipment (EEE) is obligatory for prospective profitable beneficiation. In this study, beneficiation oriented comprehensive characterization of two brands of PCBs each of 16 end-of-life EEE was conducted in terms of their physicochemical characteristics with special emphasis on the content of 16 general elements, 2 precious metals and 15 rare earth elements (REEs). General elements and their highest weight percent composition found in different PCBs of the EEEs were Cu (23% in laptop), Al (6% in computer), Pb (15% in DVD player) and Ba (7% in TV). The high abundant of precious metals such as Au (316 g/ton) and Ag (636 g/ton) in mobile phone and laptop, respectively coupled with rapid obsolescence age makes waste PCBs of information technology and telecommunication equipment the most potent resource reservoir. Additionally, most of the waste PCBs were observed to contain REEs in considerable quantity with Sc up to 31 g/ton and Ce up to 13 g/ton being the major constituents. Comprehensive characterization of waste PCBs therefore will systematically help towards better understanding of e-waste recycling processes for beneficiation purpose and sustainable resource circulation and conservation.
Materials Chemistry and Physics
Progress and Recent Trends in Microbial Fuel Cells
Process Safety and Environmental Protection
RSC Adv.
Sulfonated low density polyethylenes (LDPEs) in varied molar ratios have been analyzed as separat... more Sulfonated low density polyethylenes (LDPEs) in varied molar ratios have been analyzed as separating barriers in microbial fuel cells (MFCs) for bioelectricity production.
Waste Management
There has been a significant rise in municipal solid waste (MSW) generation in the last few decad... more There has been a significant rise in municipal solid waste (MSW) generation in the last few decades due to rapid urbanization and industrialization. Due to the lack of source segregation practice, a need for automated segregation of recyclables from MSW exists in the developing countries. This paper reports a thermal imaging based system for classifying useful recyclables from simulated MSW sample. Experimental results have demonstrated the possibility to use thermal imaging technique for classification and a robotic system for sorting of recyclables in a single process step. The reported classification system yields an accuracy in the range of 85-96% and is comparable with the existing single-material recyclable classification techniques. We believe that the reported thermal imaging based system can emerge as a viable and inexpensive large-scale classification-cum-sorting technology in recycling plants for processing MSW in developing countries.
Process Safety and Environmental Protection
Abstract Vermicomposting process employing earthworms is increasingly being used for conversion o... more Abstract Vermicomposting process employing earthworms is increasingly being used for conversion of both municipal and industrial wastes to vermicast with reduced metals content. The aim of the paper is to review recent developments and approaches for determination of bioavailable metal fractions through speciation and consequently the fate of both essential and xenobiotic heavy metals during vermicomposting of various organic wastes. The review also provides a comprehensive summary on the occurrence of heavy metals in wastes vis-a-vis metals standards worldwide and the process efficacy in limiting the mobility of heavy metals. Past and present researches demonstrated a high-degree of agreement that vermicomposting results in effective reduction of both total and bioavailable metal contents owing to the formation of stable metal complexes and/or silicate fractions. Further, it has been concurred that earthworms and associated microbial communities during vermicomposting tend to decrease the mobility of metals by enhancing enzymatic activities in both gut- and cast-associated processes. In addition, the decrease in total metal content has been attributed to accumulation and immobilization of mobile metal fractions in earthworm tissues. In summary, it can be inferred that vermicomposting potentially converts various municipal and industrial wastes to nutrients-rich organic manure for agronomic applications with reduced metals bioavailability.