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Accelerated removal of high concentration p-chloronitrobenzene using bioelectrocatalysis process and its microbial communities analysis

Peng, Xinhong, Pan, Xianhui, Wang, Xin, Li, Dongyang, Huang, Pengfei, Qiu, Guanhua, Shan, Ke, Chu, Xizhang
Bioresource technology 2018 v.249 pp. 844-850
Desulfobacterales, Desulfovibrio, Halanaerobium, biodegradation, catalytic activity, electric power, electrochemistry, energy conservation, microbial communities, models, pollutants, toxicity, wastewater
p-Chloronitrobenzene (p-CNB) is a persistent refractory and toxic pollutant with a concentration up to 200 mg/L in industrial wastewater. Here, a super-fast removal rate was found at 0.2–0.8 V of external voltage over a p-CNB concentration of 40–120 mg/L when a bioelectrochemical technology is used comparing to the natural biodegradation and electrochemical methods. The reduction kinetics (k) was fitted well according to pseudo-first order model with respect to the different initial concentration, indicating a 1.12-fold decrease from 1.80 to 0.85 h⁻¹ within the experimental range. Meanwhile, the highest k was provided at 0.5 V with the characteristic of energy saving. It was revealed that the functional bacterial (Propionimicrobium, Desulfovibrio, Halanaerobium, Desulfobacterales) was selectively enriched under electro-stimulation, which possibly processed Cl-substituted nitro-aromatics reduction. The possible degradation pathway was also proposed. This work provides the beneficial choice on the rapid treatment of high-concentration p-CNB wastewater.