• 关键词：土壤修复  工业污染场地  生物降解  碳源  有机氯农药

• 基金项目：环保公益性行业科研专项 (No.201009015)

• 雷梅
• 中国科学院地理科学与资源研究所 环境修复中心,北京 100101

• 梁琪
• 1. 中国科学院地理科学与资源研究所 环境修复中心,北京 100101;
  2. 中国科学院研究生院,北京 100049

• 杨苏才
• 中国科学院地理科学与资源研究所 环境修复中心,北京 100101

• 陈同斌
• 中国科学院地理科学与资源研究所 环境修复中心,北京 100101

• 杨军
• 中国科学院地理科学与资源研究所 环境修复中心,北京 100101

• 马杰
• 中国科学院地理科学与资源研究所 环境修复中心,北京 100101

• 摘要：我国对有机氯农药的大量需求使得在农药生产、加工和分装等过程中造成了许多城镇中存在有机氯农药污染场地,限制了土地的后续开发利用.本研究选取3种类型的碳源组成有机修复剂A、B、C,添加到受有机氯工业污染场地土壤中进行微生物降解试验,并对比了3种修复剂的效果.试验过程中,反应体系水分含量为50％,添加零价金属调节氧化还原电位,采用好氧/厌氧交替循环方式进行生物降解.实验结果表明:3种修复剂对HCHs和DDTs的降解都有显著促进作用.与DDTs相比,HCHs较易降解.90 d内,添加修复剂(A、B、C)的处理中∑HCH的浓度分别从73.37~85.71 mg·kg^-1降解到了15.88~38.21 mg·kg^-1.与未添加修复剂的对照相比较,∑HCH的降解率提高了19%~52%,90 d内,ΣHCH的降解率最高可达81%.添加修复剂(A、B、C)的处理中ΣDDT的浓度分别从91.68~119.79 mg·kg^-1降解到了45.1~60.7 mg·kg^-1,相对未添加修复剂的对照试验,∑DDT的降解率提高了39%~45%,30 d内∑DDT的降解率最高可达到51%,但30 d后降解效率无明显增加.就不同类型碳源的促进作用来看,C/N最高,而含水率最低的修复剂B的效果最好,而C/N比最低而含水率最高的修复剂A效果最差.

• Abstract：A large demand for organochlorine pesticides in China results in many contaminated sites in towns, limiting the subsequent development of land use. This study selected three different carbon sources as co-metabolism substrates and also compared the effects of three carbon sources to increase the biodegradation rate of HCHs and DDTs. In the experiment, the moisture was adjusted to 50%, zero-valent metal was added to reduce the redox potential and the aerobic/anaerobic cycle method was used. The result indicated that the addition of amendment A, B and C could enhance the degradation rates of HCHs and DDTs dramatically. The degradation rates of HCHs were higher. After 90 days, the ∑HCH concentration of the treatments with amendments (A, B, C) decreased from 73.37~85.71 mg·kg^-1 to 15.88~38.21 mg·kg^-1. The degradation rate increased by 19%~52% compared with the control. The maximum degradation rate of ∑HCH was 81% in 90 days. Degradation of DDTs was more difficult, and the ∑DDT concentration of the treatments with amendments (A, B, C) decreased from 91.68~119.79 mg·kg^-1 to 45.1~60.7 mg·kg^-1. The degradation rate increased by 39%~45% compared with the control. The maximum degradation rate of ∑DDT was 51% in 30 days. Amendment B with the highest C/N ratio and the lowest moisture is most efficient one to promote the biodegradation process, followed by C and A.

• Key words：soil remediation  industrial polluted field  biodegradation  carbon resources  organocheorine pesticides

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