【摘要】：明晰氯代烴在復(fù)雜污染體系中的生物轉(zhuǎn)化機(jī)制對(duì)強(qiáng)化污染物原位生物修復(fù)有重要意義。填埋場(chǎng)屬典型復(fù)合污染場(chǎng)地,本文對(duì)不同地區(qū)填埋場(chǎng)填埋氣中氯代烴種類、含量和其在覆蓋層中的降解情況進(jìn)行統(tǒng)計(jì)分析,發(fā)現(xiàn)填埋氣中主要包括氯代烷烴和氯代烯烴兩大類污染物,其濃度分別為0.20 32.45μg/m~3和0.50 32.45μg/m~3;覆蓋土對(duì)氯代烴降解速率隨著氯原子取代的增多而降低。基于覆蓋層中微生物種類多、生長底物復(fù)雜多樣和不同梯度氧氣含量差異等特點(diǎn),總結(jié)得出氯代烴在覆蓋土中的降解途徑主要是好氧共代謝、直接氧化和厭氧還原脫氯;并基于不同工況特點(diǎn)構(gòu)建了氯代烴在填埋場(chǎng)覆蓋層底部擴(kuò)散至大氣界面過程的生物轉(zhuǎn)化機(jī)制模型。最后就復(fù)雜環(huán)境體系中氯代烴類污染物的去除進(jìn)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.
【作者單位】： 重慶理工大學(xué)化學(xué)化工學(xué)院;重慶大學(xué)城市建設(shè)與環(huán)境工程學(xué)院;重慶理工大學(xué)藥學(xué)與生物工程學(xué)院;
【基金】：國家自然科學(xué)基金(51378522,41502328) 重慶市基礎(chǔ)與前沿研究項(xiàng)目(cstc2015jcyj B0015,2014jcyj A20007)~~
【分類號(hào)】：X705

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