Abstract
Microbial desalination cells (MDC) are evaluated as an environmentally friendly approach for purifying saline water by using power generated by the decomposition of organic materials in the wastewater. The present study is to evaluate the ferrocyanide-redox and biocathode approach in treating simulated saline water and subsequently recovering bio-electricity using actual domestic reverse osmosis reject water. For the desalination of simulated saline water and domestic reverse osmosis reject water, a three-chamber microbial desalination cell with graphite electrodes and anion and cation exchange membranes was constructed. When treating simulated saline water, the biocathode technique achieved a 5% improvement in salt removal and a 4.9% increase in current and power density when compared to the ferrocyanide-redox approach. When biocathode MDC was used to treat domestic reverse osmosis reject water, a maximum current and power density of 3.81 μA/cm2 and 0.337 μW/cm2, respectively, were recorded, as well as COD removal of 83.9% at the desalination chamber and ions reduction for Na, K, and Ca of up to 79%, 76.5%, and 72%, respectively, in a batch operation for 31 days with a stable pH (≈ 7). Thus, the study revealed a microbial desalination cell capable of recovering bioenergy and reducing salt from domestic reverse osmosis reject water with a consistent pH range.
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The authors sincerely acknowledge the laboratory facilities (SAIF and CAF) of Manipal University Jaipur and resources provided by the Department of Biosciences, Manipal University Jaipur as well as the guidance and support offered by Dr. Monika Sogani, Manipal University Jaipur.
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Dongre, A., Poddar, N.K., Sharma, R.K. et al. Effective salt removal from domestic reverse osmosis reject water in a microbial desalination cell. 3 Biotech 12, 172 (2022). https://doi.org/10.1007/s13205-022-03241-z
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DOI: https://doi.org/10.1007/s13205-022-03241-z