混合菌种对地下水中三氯乙烯的生物降解和吸附解吸的实验研究

A laboratory study of biodegradation and adsorption and desorption of trichloroethylene to mixed bacteria

由于氯代有机溶剂的大量使用和不合理的处置 ,致使三氯乙烯 (以下简称TCE)成为地下水中常见的有机污染物。本实验以TCE为靶污染物 ,采用批试验方法 ,研究了灭菌后的混合菌种对不同浓度TCE的吸附影响。实验结果表明 :当TCE浓度在 10～ 2 0 0mg l范围内 ,TCE的吸附模式符合Cs =0 17976C2 36 39e 等温方程 ;TCE的解吸模式符合C =0 0 2 987C2 1 46 1 e 等温方程 ;吸附在 15min内平衡 ;解吸在 1h内平衡。

Trichloroethylene(TCE) is the most commonly detected organic contaminant in groundwater and can also been found in potable water supplies since the chlorinated solvents are used in very large quantities and disposed unreasonably.The main target contamination of this experiment is trichloroethylene.Batch experiments are used to study the impact of sterilized mixed bacteria on the adsorption of the trichloroethylene.The test results show that the adsorption of the trichloroethylene and the desorption of the trichloroethylene for concentrations from 10 to 200mg/L can be well described by the Freundlich isothermal equation.The adsorption equilibrium is found within fifteenth minutes and the desorption equilibrium is found within one hour.