Institute of Seawater Desalination and Multipurpose Utilization, State Oceanic Administration (SOA), Nankai District, Tianjin 300192, China; MOE Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, No. 38 Tongyan Road, Jinnan District, Tianjin 300350, China.
Institute of Seawater Desalination and Multipurpose Utilization, State Oceanic Administration (SOA), Nankai District, Tianjin 300192, China.
Bioresour Technol. 2018 Feb;249:844-850. doi: 10.1016/j.biortech.2017.10.068. Epub 2017 Oct 19.
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 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.
对氯硝基苯（p-CNB）是一种持久性难降解有毒污染物，其在工业废水中的浓度高达 200mg/L。在这项研究中，与自然生物降解和电化学方法相比，当使用生物电化学技术时，在外加电压为 0.2-0.8V 的情况下，在 40-120mg/L 的 p-CNB 浓度下，发现其具有超快速的去除率。还原动力学（k）根据不同初始浓度拟合伪一级模型，表明在实验范围内，k 值从 1.80h 降低到 0.85h，降低了 1.12 倍。同时，在 0.5V 时提供了最高的 k 值，具有节能的特点。结果表明，功能细菌（丙酸微菌、脱硫弧菌、盐厌氧菌、脱硫杆菌目）在电刺激下被选择性富集，可能进行 Cl 取代的硝基芳烃还原。还提出了可能的降解途径。这项工作为快速处理高浓度对氯硝基苯废水提供了有益的选择。
