难降解有机物氯贝酸在好氧序批式反应器中的分配与转化  

Distribution and transformation of clofibric acid in wastewater treatment bioreactor

作　　者：金鹏康[1] 李冬芳[1] 章佳昕 

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055

出　　处：《环境化学》2015年第7期1335-1342,共8页Environmental Chemistry

基　　金：国家自然科学基金项目(51178376)资助

摘　　要：通过建立好氧序批式反应器(SBR),研究了以氯贝酸为难降解有机物代表性物质在活性污泥处理系统中的去除特性及分配转化规律,并探讨了氯贝酸代谢产物的产生与变化情况.通过对水相及泥相中氯贝酸的分析监测,发现活性污泥对其吸附作用微弱,生物降解是其去除的主要机制,氯贝酸的生物去除率在10%—12%之间.液相色谱分析结果表明,氯贝酸生物降解产生3种代谢产物:α-羟基异丁酸、乳酸、对氯苯酚.其中,α-羟基异丁酸是氯贝酸生物降解的主要产物,最大浓度约200μg·L-1左右;其次是乳酸,其最大浓度约70μg·L-1,这两种物质在水中均呈现先累积然后被微生物逐渐利用而减少的趋势;对氯苯酚的含量最少.This paper studied the removal, distribution and transformation of clofibric acid a representative persistent organic contaminant in aerobic sequencing batch reactor （SBR）. The production and variation of metabolites of clofibric acid were monitored. Based on the analysis of clofibric acid content in the sewage and sludge phase, the biological degradation was shown to be the primary removal mechanism, which reached 10% ~ 12% removal efficiency. Adsorption was relatively weak. HPLC analysis showed that clofibric acid mainly produced three biodegradation metabolites： α-hydroxyisobutyric acid, lactic acid and 4-chlorophenol. α-Hydroxyisobutyric acid was the major metabolite and its highest concentration was about 200μg· L^-1 The second was lactic acid with the highest concentration of about 70μg·L^-1.The two substances initially accumulated in the sewage for a period, and then were gradually utilized by microorganisms. The concentration of 4-chlorophenol was very low.

关 键 词：难降解有机物 氯贝酸 污水处理 分配转化 代谢产物. 

分 类 号：X703[环境科学与工程—环境工程]