中文摘要：

通过序批试验研究了零价铁修复对底泥中1,3-二氯苯的去除效果,分析了零价铁修复过程中pH和铁离子质量浓度以及修复后底泥土壤酶的恢复情况.结果表明：添加占底泥干质量2%的还原铁粉,1,3-二氯苯的去除率可达72.3%〔初始w（1,3-二氯苯）为500 mg/kg,培养时间为20 d〕,较未添加零价铁修复处理高52.0%.零价铁有效地促进了底泥中1,3-二氯苯的去除,土著微生物在自然恢复中起一定的作用.在修复过程中零价铁并未使底泥pH发生明显变化,底泥水体中的总铁质量浓度（低于0.3 mg/L）始终符合地表水环境质量标准（GB3838—2002）.1,3-二氯苯污染使底泥过氧化氢酶、转化酶和蛋白酶的酶活性显著降低,使脲酶的酶活性显著升高.零价铁修复使1,3-二氯苯抑制的底泥过氧化氢酶的酶活性恢复到未污染对照水平.

英文摘要：

The removal of 1,3-dichlorobenzene in sediments using zero-valent iron（ZVI） was studied by batch experimentation.The changes of pH,Fe^2＋ and Fe^3＋ mass concentrations were detected in the process of remediation.At the end of the remediation,the soil enzyme activities were also detected.The results showed that the removal rate of 1,3-dichlorobenzene（initial concentration 500 （mg/kg）,20 days） was 72.3% with ZVI addition equal to 2% sediment dry mass.This was 52.0% higher than that of the treatment without ZVI addition.ZVI addition promoted removal of 1,3-dichlorobenzene in the sediments efficiently,while microorganisms in the sediments also had some capability to remove it.In the course of the experiments,the remediation using ZVI did not have a significant effect on the pH of the sediments.Although the concentrations of Fe^2＋ and Fe^3＋ both increased,the total iron mass concentration was lower than 0.3（mg/L）（the environmental quality standard for surface water（GB3838-2002）） at all times.The effect of 1,3-dichlorobenzene on soil enzymes in the sediments was different.The calatase,invertase and protease activities were lower in the 1,3-dichlorobenzene contaminated sediments than in the control sediments,while the urease activity was higher in the 1,3-dichlorobenzene contaminated sediments than in the control sediments.However,the calatase activity,which was inhibited by 1,3-dichlorobenzene,was restored after the remediation using ZVI.