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Year: 2019, Issue: June
Bioremediation of toxic heavy metals from electroplating effluents.
Shalini A. Tandon, Mrugank J. Thakore, Samir Dhapare and Rashmi Kumar
Bioremediation, Industrial effluent, Heavy metals, UV-spectroscopy, Microbial growth curve.
Huge quantities of heavy metals containing waste are produced from mining and metal finishing processes such as electroplating and electronic manufacturing industries. Recovery of heavy metals such as copper, zinc and chromium by biosorption has been studied in this work. Simulated samples were prepared based on composition of actual effluent collected from electroplating unit; Microbial strains effective in removing these metals were isolated by mixing the industrial effluents of the respective metals with sewage water. Metal removal capacity by these organisms from these simulated samples was tested by spectroscopic analysis after intervals of 2, 5 and 7 days. Study shows that 39.4% and 44.5% of zinc biosorption was observed for 60 mg/l and 80 mg/l zinc concentration samples respectively. The industrial effluent with zinc concentration of 82.5 mg/l gave similar results. Chromium present in the industrial effluent was 35.6 mg/l and gave a biosorption of 61% while chromium metal solutions of concentrations 30 mg/l and 40 mg/l gave biosorption of 64.8% and 62.9% respectively. The industrial effluent having copper concentration of 3.73 mg/l gets reduced to 1 mg/l by microbial action over 7 days.
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