Journal
BIORESOURCE TECHNOLOGY
Volume 249, Issue -, Pages 844-850Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.10.068
Keywords
Bio-electrocatalysis; p-Chloronitrobenzene; Initial concentration; Applied voltage; Microbial communities diversity
Funding
- National Natural Science Foundation of China (NSFC) [51409052]
- National Key R & D Program of China [2017YFC0403502]
- Scientific Research Project of the Marine Public Welfare Industry of China [201505006]
- Central Public Interest Scientific Institution Basal Research Fund [K-JBYWF-2016-T17, K-JBYWF-2015-T17, K-JBYWF-2015-T16, K-JBYWF-2015-G34]
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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.
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