Bioremediation of Steel Plant Wastewater and Improved Electricity Generation in Bio-Electrochemical Desalination Cell

Harapriya Pradhan; Omkar A. Shinde; Makarand M. Ghangrekar; Supriya Sarkar

doi:10.4028/www.scientific.net/AMR.1130.648

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Mining Impacts on the Environment - Water Footprint Assessment of Copper Cathode and Copper Concentrate
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Bioremediation of Steel Plant Wastewater and Improved Electricity Generation in Bio-Electrochemical Desalination Cell
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Bioremediation of Steel Plant Wastewater and Improved Electricity Generation in Bio-Electrochemical Desalination Cell

Abstract:

A new technology called microbial desalination cell (MDC) approaches a comprehensive way to design an innovative system for removal of organic matter and dissolved solids from wastewater. In this study, two laboratory scale MDCs having three chambered (3C-MDC) and five chambered (5C-MDC) configuration were developed for integrated biodegradation of steel plant wastewater. The 3C-MDC have anodic, middle desalination and cathodic chamber; while 5C-MDC have anodic, cathodic, middle desalination and two concentrate chambers separated by ion exchange membranes. Using synthetic saline water with 8 and 30 g/L of TDS and steel plant wastewater (3.74 g TDS/L) in desalination chamber, the TDS removal of 64 ± 2.3%, 75 ± 1.8%, and 58 ± 1.3% were observed in 3C-MDC, while in 5C-MDC, those were 58 ± 1.5%, 71 ± 2.1%, and 64 ± 2.4%, respectively in 96 h of fed batch operation. With 30 g/L of TDS concentration, the power generation observed in 3C-MDC and 5C-MDCs were (81 mW/m² and 78 mW/m²) higher than the power observed with 8 g/L (56 mW/m² and 45 mW/m²). However, with steel plant wastewater in desalination chamber the power density increased to 76 mW/m² in 5C-MDC and significantly decreased to 39 mW/m² in 3C-MDC.