Bioreduction of para-chloronitrobenzene in drinking water using a continuous stirred hydrogen-based hollow fiber membrane biofilm reactor.
Bioreduction of para-chloronitrobenzene in drinking water using a continuous stirred hydrogen-based hollow fiber membrane biofilm reactor.
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DOI：
10.1016/j.jhazmat.2011.05.060
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发表时间：
2011-08
影响因子：
13.6
通讯作者：
S. Xia;Hai-xiang Li;Zhiqiang Zhang;Yanhao Zhang;Xin Yang;R. Jia;K. Xie;Xiaotian Xu
中科院分区：
文献类型：
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作者：
S. Xia;Hai-xiang Li;Zhiqiang Zhang;Yanhao Zhang;Xin Yang;R. Jia;K. Xie;Xiaotian Xu
对氯硝基苯(p-CNB)在环境中具有特别强的危害性和持久性，是优先考虑的污染物之一。厌氧条件下的生物还原是p-CNB降解的一个可行途径。采用氢基中空纤维膜生物膜反应器(HFMBfR)研究了p-CNB的生物还原。实验结果表明，p-CNB首先被还原为中间体对氯苯胺(p-CAN)，然后再还原为苯胺，再经过硝基还原和以H_2为电子供体的还原脱氯反应。在进水p-CNB浓度为2 mg/L、水力停留时间为4.8h时，HFMBfR对p-CNB的去除效果最好，达到99.3%，相当于p-CNB的通量为0.058g/m~2·d。H_2的利用率、p-CNB的负载量和竞争电子受体的存在影响了p-CNB的还原。通量分析表明，还原p-CNB和p-CAN比还原硝酸盐和硫酸盐消耗更少的电子。在本实验中，HFMBfR在不同的稳态下具有较高的平均氢利用效率，最高效率为98.2%。
para-Chloronitrobenzene (p-CNB) is particularly harmful and persistent in the environment and is one of the priority pollutants. A feasible degradation pathway for p-CNB is bioreduction under anaerobic conditions. Bioreduction of p-CNB using a hydrogen-based hollow fiber membrane biofilm reactor (HFMBfR) was investigated in the present study. The experiment results revealed that p-CNB was firstly reduced to para-chloraniline (p-CAN) as an intermediate and then reduced to aniline that involves nitro reduction and reductive dechlorination with H2as the electron donor. The HFMBfR had reduced p-CNB to a major extent with a maximum removal percentage of 99.3% at an influent p-CNB concentration of 2mg/L and a hydraulic residence time of 4.8h, which corresponded to a p-CNB flux of 0.058g/m2d. The H2availability, p-CNB loading, and the presence of competing electron acceptors affected the p-CNB reduction. Flux analysis indicated that the reduction of p-CNB and p-CAN could consume fewer electrons than that of nitrate and sulfate. The HFMBfR had high average hydrogen utilization efficiencies at different steady states in this experiment, with a maximum efficiency at 98.2%.