Electronic wastes, sometimes referred to as garbage electrical and electronic equipments (WEEE), are a significant kind of urban garbage that contributes to widespread contamination on a global scale. E-waste is a significant threat to the environment and can cause many health hazards. This includes the release of harmful substances through incineration, pollution of food and water, and long-term exposure to recycling facilities leading to organ imbalances. These risks affect all living organisms. Typically, e-waste is produced as a result of the manufacturing of new electronic or electrical products. Furthermore, electronic trash contains a variety of useful and recyclable components, particularly metals. Precious metals such as silver, copper, gold, lead, mercury, and cadmium, which are classified as heavy metals, are obtained through the process of recycling. There are three distinct methods for recycling e-waste: the physical approach, the chemical method, and the biological method. The recycling process, using both physical and chemical methods, can lead to the generation of smoke and dust, which pose various hazardous risks. Biological leaching is the most likely and natural method for cleaning the environment and extracting various metals, as well as removing hazardous substances like Persistent Organic Pollutants (POPs). Thus, the present study focuses on utilizing cyanogenic organisms to biologically extract copper and lead metals from electronic trash through a process known as leaching. Chromobacterium violaceum MTCC-2656, Pseudomonas aeruginosa, and Pseudomonas fluorescens. The microbes MTCC-103 and Aspergillus niger MXPE6 are employed for metal extraction by generating secondary metabolites, namely Hydrogen cyanide (HCN) and citric acid, which function as leaching agents. The results obtained from Flame Atomic Absorption Spectroscopy (FAAS) indicated that the cyanogenic microbe, C. violaceum MTCC-2656, was able to extract up to 50% of copper and 60% of lead metals from 1 g of electronic waste. Additionally, P. aeruginosa was shown to leach 50% of lead metal per 0.5 g of e-waste.

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Extraction of Lead and Copper Metals Using Microbial Leaching Process from Electronic Waste

  • N. Mahesh,
  • T. Maheshwari,
  • S. Balakumar

摘要

Electronic wastes, sometimes referred to as garbage electrical and electronic equipments (WEEE), are a significant kind of urban garbage that contributes to widespread contamination on a global scale. E-waste is a significant threat to the environment and can cause many health hazards. This includes the release of harmful substances through incineration, pollution of food and water, and long-term exposure to recycling facilities leading to organ imbalances. These risks affect all living organisms. Typically, e-waste is produced as a result of the manufacturing of new electronic or electrical products. Furthermore, electronic trash contains a variety of useful and recyclable components, particularly metals. Precious metals such as silver, copper, gold, lead, mercury, and cadmium, which are classified as heavy metals, are obtained through the process of recycling. There are three distinct methods for recycling e-waste: the physical approach, the chemical method, and the biological method. The recycling process, using both physical and chemical methods, can lead to the generation of smoke and dust, which pose various hazardous risks. Biological leaching is the most likely and natural method for cleaning the environment and extracting various metals, as well as removing hazardous substances like Persistent Organic Pollutants (POPs). Thus, the present study focuses on utilizing cyanogenic organisms to biologically extract copper and lead metals from electronic trash through a process known as leaching. Chromobacterium violaceum MTCC-2656, Pseudomonas aeruginosa, and Pseudomonas fluorescens. The microbes MTCC-103 and Aspergillus niger MXPE6 are employed for metal extraction by generating secondary metabolites, namely Hydrogen cyanide (HCN) and citric acid, which function as leaching agents. The results obtained from Flame Atomic Absorption Spectroscopy (FAAS) indicated that the cyanogenic microbe, C. violaceum MTCC-2656, was able to extract up to 50% of copper and 60% of lead metals from 1 g of electronic waste. Additionally, P. aeruginosa was shown to leach 50% of lead metal per 0.5 g of e-waste.