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Evaluation of limiting factors for current density in microbial electrochemical cells (MXCs) treating domestic wastewater

机译:微生物电化学池处理生活废水中电流密度限制因素的评估

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摘要

This study quantitatively assessed three limiting factors for current density in a microbial electrochemical cell (MXC) treating domestic wastewater: (1) buffer concentration, (2) biodegradability, and (3) particulates. Buffer concentration was not significant for current density in the MXC fed with filtered domestic wastewater (180 mg COD/L). Current density reduced by 67% in the MXC fed with filtered sewage having similar COD concentration to acetate medium, which indicates poor biodegradability of soluble organics in the wastewater. Particulate matters seriously decreased current density down to 76%, probably due to the accumulation of particulates on biofilm anode. Our study quantitatively showed that buffer concentration does not limit current density much, but biodegradability of soluble organics and fermentation rate of particulate matters in domestic wastewater mainly control current density in MXCs.
机译:这项研究定量评估了用于处理生活污水的微生物电化学池(MXC)中电流密度的三个限制因素:(1)缓冲液浓度,(2)可生物降解性和(3)微粒。缓冲液浓度对于经过滤的生活污水(180 mg COD / L)注入的MXC中的电流密度而言并不显着。 MXC进料的MXC的电流密度降低了67%,而MXC的COD浓度与乙酸盐介质的COD浓度相似,这表明废水中可溶性有机物的生物降解性较差。微粒物质使电流密度严重降低至76%,这可能是由于微粒在生物膜阳极上的积聚。我们的研究定量地表明,缓冲液浓度并没有很大地限制电流密度,但是生活污水中可溶性有机物的生物降解能力和颗粒物的发酵速率主要控制了MXC中的电流密度。

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