复合有机污染物在含水层介质表面的吸附性能

为明确氯代烃芳香烃类复合污染物在含水层介质上的吸附特性，选取甲苯、苯、1，2-二氯丙烷，1，2，3-三氯丙烷（TCP）作为典型污染物开展吸附试验，结果表明吸附过程符合Henry线性模型，分配系数K_p值分别为0.38，0.41，0.73，1.00kg/L，污染物在细砂上的吸附强度顺序为甲苯>苯> 1，2-二氯丙烷> TCP；竞争吸附试验结果表明，苯可以明显促进甲苯在细砂介质上的吸附，而甲苯抑制了苯的吸附；1，2-二氯丙烷抑制TCP在细砂介质上的吸附，而TCP对1，2-二氯丙烷的吸附影响并不明显.TCP在含水层介质上的吸附量随甲苯浓度增加而增大；当甲苯初始浓度<2mg/L时，TCP对于甲苯在含水层介质上的吸附起促进作用，当甲苯的初始浓度³2mg/L时，TCP对于其在含水层介质上的吸附起抑制作用.

Adsorption characteristic of organic combined pollutants on the surface of groundwater aquifer

To definite the adsorption characteristics of chlorohydrocarbon and aromatic hydrocarbon combined pollutants in groundwater aquifer, adsorption tests were carried out with toluene, benzene, 1,2-dichloropropane, 1,2,3-chemical propane (TCP) as typical pollutants. The results showed that the adsorption process could be described by linear model of Henry with distribution coefficient (K_p) of 0.38, 0.41, 0.73 and 1.00kg/L, respectively, which indicated that the order of adsorption strength of the pollutants is toluene > benzene > 1, 2-dichloropropane > TCP. Furthermore, it was observed that benzene obviously increased the adsorption of toluene in fine sand and toluene decreased the adsorption of benzene conversely; 1, 2-dichloropropane restrained the adsorption of TCP, however, the effect of TCP on the adsorption of 1, 2-dichloropropane was not significant. As for different type of pollutants, the adsorption capacity of TCP in aquifer medium increased with the concentration of toluene; When the initial concentration of toluene was lower than 2mg/L, the TCP acted as a stimulus for the adsorption of toluene, on the contrary, TCP acted as an inhibitor for the adsorption of toluene in aquifer medium.