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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.