填埋场氯代烃生物降解过程的机制转化与调控研究及展望
发布时间：2018-07-15 22:06
【摘要】：明晰氯代烃在复杂污染体系中的生物转化机制对强化污染物原位生物修复有重要意义。填埋场属典型复合污染场地,本文对不同地区填埋场填埋气中氯代烃种类、含量和其在覆盖层中的降解情况进行统计分析,发现填埋气中主要包括氯代烷烃和氯代烯烃两大类污染物,其浓度分别为0.20 32.45μg/m~3和0.50 32.45μg/m~3;覆盖土对氯代烃降解速率随着氯原子取代的增多而降低。基于覆盖层中微生物种类多、生长底物复杂多样和不同梯度氧气含量差异等特点,总结得出氯代烃在覆盖土中的降解途径主要是好氧共代谢、直接氧化和厌氧还原脱氯;并基于不同工况特点构建了氯代烃在填埋场覆盖层底部扩散至大气界面过程的生物转化机制模型。最后就复杂环境体系中氯代烃类污染物的去除进行了展望。
[Abstract]:It is important to clarify the biotransformation mechanism of chlorinated hydrocarbons in complex pollution systems for enhancing in situ bioremediation of pollutants. The landfill site is a typical compound polluted site. The types, contents and degradation of chlorinated hydrocarbons in landfill gas from different areas are analyzed statistically in this paper. It was found that the main pollutants in landfill gas were chlorinated alkanes and chlorinated alkenes, the concentrations of which were 0.20 ~ 32.45 渭 g/m~3 and 0.50 ~ 32.45 渭 g / m ~ (-3), respectively, and the degradation rate of chlorinated hydrocarbons decreased with the increase of chlorine atoms. Based on the characteristics of many microbes in the overburden, complex growth substrate and different oxygen content gradient, it is concluded that the degradation pathway of chlorinated hydrocarbon in mulch soil is mainly aerobic co-metabolism, direct oxidation and anaerobic reduction dechlorination. Based on the characteristics of different working conditions, a biotransformation mechanism model of chlorinated hydrocarbon diffusion to the atmospheric interface at the bottom of the overburden of the landfill was established. Finally, the removal of chlorinated hydrocarbons in complex environmental systems is prospected.
【作者单位】： 重庆理工大学化学化工学院;重庆大学城市建设与环境工程学院;重庆理工大学药学与生物工程学院;
【基金】：国家自然科学基金(51378522,41502328) 重庆市基础与前沿研究项目(cstc2015jcyj B0015,2014jcyj A20007)~~
【分类号】：X705
[Abstract]:It is important to clarify the biotransformation mechanism of chlorinated hydrocarbons in complex pollution systems for enhancing in situ bioremediation of pollutants. The landfill site is a typical compound polluted site. The types, contents and degradation of chlorinated hydrocarbons in landfill gas from different areas are analyzed statistically in this paper. It was found that the main pollutants in landfill gas were chlorinated alkanes and chlorinated alkenes, the concentrations of which were 0.20 ~ 32.45 渭 g/m~3 and 0.50 ~ 32.45 渭 g / m ~ (-3), respectively, and the degradation rate of chlorinated hydrocarbons decreased with the increase of chlorine atoms. Based on the characteristics of many microbes in the overburden, complex growth substrate and different oxygen content gradient, it is concluded that the degradation pathway of chlorinated hydrocarbon in mulch soil is mainly aerobic co-metabolism, direct oxidation and anaerobic reduction dechlorination. Based on the characteristics of different working conditions, a biotransformation mechanism model of chlorinated hydrocarbon diffusion to the atmospheric interface at the bottom of the overburden of the landfill was established. Finally, the removal of chlorinated hydrocarbons in complex environmental systems is prospected.
【作者单位】： 重庆理工大学化学化工学院;重庆大学城市建设与环境工程学院;重庆理工大学药学与生物工程学院;
【基金】：国家自然科学基金(51378522,41502328) 重庆市基础与前沿研究项目(cstc2015jcyj B0015,2014jcyj A20007)~~
【分类号】：X705
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