二维电场中微生物群落动态及混合有机物降解特征

Dynamics of microbial community and degradation characteristics of mixed organics in a 2-dimensional electric field

以正十六烷、环十二烷和芘组成的混合有机污染物为研究对象,在二维对称电场修复平台上,采用电动-微生物联合修复(BIO-EK)的方式,通过分析微生物群落时空动态及混合有机物降解的时空特征,探讨了二维电场中电场强度、微生物群落和污染物降解特征之间的相关性.结果表明,BIO-EK处理过程中,土壤pH和温度在时间和空间上均没有发生明显的变化,微生物群落结构和数量均主要随处理时间而变化,未发生明显的空间上的变化;电场的施加可提高微生物数量,对污染物降解有积极影响,相对于单独的微生物(BIO)和单独的电动(EK)处理,BIO-EK对污染物处理效率最高;不同类型污染物去除率与电场强度均呈正相关.

This study evaluated the interactions among electric intensity, microbial community and degradation characteristics of contaminants in the bio- electrokinetics （BIO-EK）, by analyzing the temporal and spatial dynamics of the microbial community and characteristics of mixed organics, n- hexadecane, cyclododecane and pyrene were used as mixed organic pollutants, and a 2-dimensional （ 2-D ） symmetric electric field was applied as remediation platform. The results demonstrate that, during the experiments, the soil pH and temperature show little spatial and tempora/ variation.The microbial community changed significantly, whereas no significant spatial variation were noticed. The presence of the electric field improved the microbial quantity, having a positive effect on pollutants degradation, and the pollutants decreased most intensively in the BIO-EK test compared with bioremediation （BIO） - and eleetrokinetics （EK） -only tests. An obvious positive correlation between the degradation rates of different types of pollutants and electric intensity was detected.