Reductive transformation and detoxification mechanism of 2,4-dinitrochlorobenzene in combined zero valent iron and anaerobic-aerobic process.
Reductive transformation and detoxification mechanism of 2,4-dinitrochlorobenzene in combined zero valent iron and anaerobic-aerobic process.
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DOI：
10.1016/s1001-0742(11)61054-1
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发表时间：
2012-11
影响因子：
6.9
通讯作者：
Jinyou Shen;Zongyuan Zhou;Changjin Ou;Xiuyun Sun;Jiansheng Li;Weiqing Han;Lingfeng Zhou;Lianjun Wang
中科院分区：
文献类型：
--
作者：
Jinyou Shen;Zongyuan Zhou;Changjin Ou;Xiuyun Sun;Jiansheng Li;Weiqing Han;Lingfeng Zhou;Lianjun Wang
采用零价铁（ZVI）和厌氧-好氧联合工艺处理含2,4-二硝基氯苯（DNCB）废水。研究了转化途径、降低急性毒性和增强生物降解性。经过ZVI预处理后，废水中的DNCB可完全转化为2,4-二氨基氯苯(DACB)。 BOD5/COD比值从0.005±0.001增加到0.168±0.007，而EC50，48hr(V/V)从0.65%增加到5.20%，表明ZVI预处理后生物降解性增强，急性毒性降低。以甲醇为电子供体，DACB在厌氧过程中进一步脱氯为间苯二胺，48小时EC50从5.20%提高到48.2%。经过后续的厌氧-好氧过程，间苯二胺被完全降解，出水COD为67.5±10.8mg/L。随后的厌氧-好氧过程的流出物对斑马鱼没有毒性。 ZVI与厌氧-好氧相结合的工艺为含氯硝基芳香化合物废水的处理提供了广阔的前景。
A combined zero valent iron (ZVI) and anaerobic-aerobic process was adopted for the treatment of 2,4-dinitrochlorobenzene (DNCB)-containing wastewater. The transformation pathway, reduction of acute toxicity and enhancement of biodegradability were investigated. After pretreatment by ZVI, DNCB in wastewater could be completely converted into 2,4-diaminochlorobenzene (DACB). The ratio of BOD5/COD increased from 0.005 ± 0.001 to 0.168 ± 0.007, while EC50, 48hr(V/V) increased from 0.65% to 5.20%, indicating the enhancement of biodegradability and reduction of acute toxicity with the pretreatment by ZVI. DACB was further dechlorinated to m-phenylenediamine during the anaerobic process using methanol as electron donor, with EC50, 48hrincreasing from 5.20% to 48.2%. After the subsequent anaerobic-aerobic process, m-phenylenediamine was degraded completely, with effluent COD of 67.5 ± 10.8 mg/L. This effluent of the subsequent anaerobic-aerobic process was not toxic to zebrafish. The combined ZVI and anaerobic-aerobic process offers bright prospects for the treatment of chlorinated nitroaromatic compound-containing wastewater.