生态环境学报2012，Vol.21Issue(4)：720-725,6.
BTEX在河流渗滤系统中的降解行为实验模拟研究
Experimental simulation study of microbial degradation of BTEX in the river filtration system
摘要
Abstract
River filtration system is a natural purification, which means while the river water passing through the soil and the aquifer material, potential contaminants in the river water are filtered and attenuated by a series of physical, chemical and biological actions. In this study soil column experiments were carried out with self-designed experimental device and artificial leachate to simulate the degradation of BTEX during the process of the polluted river water passing through the river filtration system. The experiment dura-tion was 48d, and the duration curves of the four components of BTEX and two electron acceptors were obtained. The results re-vealed that environmental behaviors of BTEX in the river filtration system were including adsorption and microbial degradation. The purification effect of adsorption was limited. On the other hand, BTEX contamination could be well removed by degradation. Among the removal ratios of the four components of BTEX, that of M-xylene was the highest, the average removal ratios of which under the conditions of the two different electron acceptors NO3- and SO42-were respectively 85.5% and 82.4%, the second was Toluene and Ethyl-benzene, and that of Benzene was the lowest, which reached 68.5% and 63.5%. The degradation of BTEX lagged behind the changing of the concentration of BTEX due to the effect of the adsorption. The soil-water partition coefficient Kd of each component of BTEX was the higher, the degradation ratio was the lower. The results showed that all of the best removal ratios of the four com-ponents of BTEX were over 80% and the average removal ratios were also over 60%. As a natural purification river filtration could efficiently remove the BTEX mixed pollution within a quite high concentration range and protect the ground water from being con-taminated , but its purification effect was limited within a certain range of time and concentration. When the adsorption saturation was achieved and microbial activity was restrained, BTEX contamination would penetrate through the riverbed sediments and threaten the security of the ground water.关键词
河流渗滤系统/BTEX/降解行为/实验模拟Key words
BTEX/ river filtration system/ microbial degradation/ experimental simulation分类
资源环境引用本文复制引用
马燕,李志萍,梁珂,刘明珠..BTEX在河流渗滤系统中的降解行为实验模拟研究[J].生态环境学报,2012,21(4):720-725,6.基金项目
国家自然基金项目项目(40772165) （40772165）
华北水利水电学院高层次人才科研启动金项目 （）
