Dongre Aman, Poddar Nitesh Kumar, Sharma Rakesh Kumar, Sogani Monika
Department of Biosciences, Manipal University Jaipur, Jaipur, 303007 India.
3 Biotech. 2022 Aug;12(8):172. doi: 10.1007/s13205-022-03241-z. Epub 2022 Jul 13.
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/cm and 0.337 μW/cm, 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.
微生物脱盐电池（MDC）被视为一种环保方法，可利用废水中有机物质分解产生的电能来净化盐水。本研究旨在评估亚铁氰化物氧化还原和生物阴极方法处理模拟盐水，并随后使用实际生活中的反渗透浓水回收生物电。为了对模拟盐水和生活反渗透浓水进行脱盐处理，构建了一个带有石墨电极以及阴离子和阳离子交换膜的三室微生物脱盐电池。在处理模拟盐水时，与亚铁氰化物氧化还原方法相比，生物阴极技术的脱盐率提高了5%，电流和功率密度增加了4.9%。当使用生物阴极MDC处理生活反渗透浓水时，记录到的最大电流和功率密度分别为3.81 μA/cm和0.337 μW/cm，在31天的分批操作中，脱盐室的化学需氧量（COD）去除率达到83.9%，Na、K和Ca离子的减少率分别高达79%、76.5%和72%，且pH稳定在约7。因此，该研究揭示了一种微生物脱盐电池，能够在pH范围一致的情况下从生活反渗透浓水中回收生物能源并减少盐分。
