Review of anaerobic dechlorination of high concentrated trichloroethylene in groundwater.

Trichloroethylene(TCE) is an organic solvent widely used in industry and commonly exists in soil and groundwater,while high concentrated TCE may lead to persistent pollution.Based on the feasibility of the degradation of high concentrated TCE,the pathway of anaerobic reductive dechlorination and the main factors influencing degradation,i.e.,electron donor and microorganism,were reviewed in this paper.Meanwhile,we discussed the impact of pH and various restricting factors on the degree and the rate of reductive dechlorination.Commonly used kinetic models for the reductive degradation kinetics were listed and compared.The trend of future research was discussed.In experiment,selecting and cultivating of dechlorination bacterium which can survive in source zones with high concentrated chlorinated ethene and the effect of electron donor substrates need further study.In numerical simulation,models are required for comprehensive simulation of biological reaction,hydrogeochemical reaction,as well as physical flow and multi-species transport in groundwater.Moreover,parameters in these models lack verification,which need further study.