| 还原脱氯-生物联合降解2,4-二氯苯氧乙酸 |
| 摘要点击 2261 全文点击 1431 投稿时间：2014-01-17 修订日期：2014-04-03 |
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| 中文关键词 2,4-二氯苯氧乙酸 苯氧乙酸 还原脱氯 生物氧化 联合作用 |
| 英文关键词 2,4-D PA reductive dechlorination biological oxidation combination |
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| 中文摘要 |
| 采用Pd/Fe双金属对2，4-二氯苯氧乙酸（2，4-D）进行催化还原脱氯，以活性污泥对2，4-D脱氯产物进行生物氧化，考察初始pH、活性污泥量、污染物初始浓度、温度等因素对生物氧化的影响情况. 通过PCR-变性梯度凝胶电泳分析污泥体系菌群变化情况，高效液相色谱测定来推测目标污染物的降解过程. 结果表明：① Pd/Fe双金属可有效还原2，4-D，其主要先还原为2-氯苯氧乙酸（2-CPA），最终顺序脱氯为苯氧乙酸（PA）. ② 2，4-D具有较大生物毒性，其脱氯产物毒性下降，更易被生物降解. ③ pH=7、污泥量50 mL/200 mL、适量的初始PA浓度（14.6 mg ·L-1）和30℃ 均有利于PA的去除. 在该条件下反应96 h，PA去除率可达84.3%. |
| 英文摘要 |
| In this paper, Pd/Fe nanoparticles were used to degrade 2,4-D. Then the resulted solution of 2,4-D dechlorination was biological oxidized by activated sludge. And the effects of initial pH, activated sludge volume, initial contaminant concentration and temperature on the removal of PA were studied. Polymerase Chain Reaction-Denaturing Gradient Gel Electrophoresis (PCR-DGGE) was used to study microbial community structure. And High Performance Liquid Chromatography (HPLC) was employed to determine and analyze the degradation process of target pollutant. The conclusions can be summarized as follows: ① Pd/Fe can degrade 2,4-D efficiently, 2-CPA was the intermediate product, and the end product was PA. ② Compared with 2,4-D, the dechlorination product PA has lower biological toxicity, and can be more easily degraded by activated sludges. ③ pH=7, 50 mL activated sludge/200 mL solution, PA initial concentration of 14.6 mg ·L-1 and 30℃ favored the PA removal. Under suitable conditions, the removal rate of PA can reach to 84.3% after 96 hours. |
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