正十六烷在电场作用下的迁移与微生物降解

研究了砂土中的正十六烷在电动强化微生物作用下的迁移特征和影响因素,揭示利用非均匀电动力学技术修复链烷烃污染土壤的特性。结果表明:非均匀电动力学过程能有效地促进土壤中正十六烷和细菌的迁移,电渗析是其主要作用机理。在1.2V/cm电压梯度下砂土中的正十六烷向阴极迁移速率约为0.7cm/d;电极对污染物、降解菌的迁移作用和电极反应引起的土壤pH变化使得污染物主要在距阳极15cm处被降解,可利用该过程将污染物迁移到规定区域,然后投加高效降解菌进行定点修复。

MOBILIZATION AND MICROORGANISM DEGRADATION OF N-HEXADECANE BY ELECTROKINETICS

Electro-bioremedy is a promising technology for the degradation of alkanes majorly constituting of total petroleum hydrocarbons in contaminated soils.In this study,the mobilization and its affecting factors of n-hexadecane in sand soil by non-uniform electrokinetics was investigated,through bench-scale experiments,to assess the feasibility of using non-uniform electrokinetic technology to remedy alkane-contaminated soils.The results showed that non-uniform electrokinetic transport processes can effectively stimulate the movement of n-hexadecane and bacteria in the tested soils,and electroosmosis was the main driving forces in the mobilization.The movement of n-hexadecane in the sand soil towards the cathode was about 0.7 cm/d under a potential gradient of 1.0V·cm-1;Soil pH change and mobilization of n-hexadecane and microorganisms by electrokinetics played an important role for the degradation of n-hexadecane,which mainly happened at the location 15 cm away from the anode;Appropriate electrokinetic process could be adopted to migrate pollutant to designated areas,where efficient degrading microorganisms were added to carry out targeted remedy.