Evaluating the removal efficiency of cadmium and mercury from industrial wastewater using microbial desalination cell

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Abstract

Microbial desalination cell (MDC) is a process converting the energy stored in chemical bonds of organic compounds into electrical energy by exoelectrogenic bacteria. In this study, polyester fabric membranes were used as selective membranes, and microorganisms were obtained from activated sludge, so that this reactor would be more cost-effective. Synthetic samples were provided with the concentration of 25, 50, 75, and 100 mg L–1 of cadmium and mercury, and removal efficiency was analyzed after 60, 90, and 120 min of retention time in psychrophilic, mesophilic, and thermophilic phases and with 3–4, 4–5, and 5–6 mg L–1 dissolved oxygen (DO). Optimum conditions for removing cadmium and mercury were observed in 100 mg L–1 concentration, 4.43 mg L–1 DO, 26.25ðC, and 120 min of retention time. Experiments were performed on the wastewater of Isfahan Steel Company, Iran, as an actual sample. The removal efficiency of cadmium and mercury was 69.57% and 67.26%, respectively. MDC is a good choice for industries because it can simultaneously treat municipal and industrial wastewater in separated chambers as an effective method with a relatively high efficiency for removing cations in industrial wastewater.

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Mirzaienia, F., Jonidi Jafari, A., & Malakootian, M. (2019). Evaluating the removal efficiency of cadmium and mercury from industrial wastewater using microbial desalination cell. Desalination and Water Treatment, 154, 289–295. https://doi.org/10.5004/dwt.2019.24046

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