地层对四氯化碳迁移影响的实验研究

Experimental Study on the Influence of Stratum Media on the Migration of CT

四氯化碳(CT)在地下水中是一种持久性的有机污染物(POPs),工业污水和残留在土壤中的CT一旦进入地下含水层,会长期影响人类的用水安全。了解土壤对CT的去除效能,以及CT在地层中的迁移规律,可以为地下水污染的风险评估和修复治理提供依据。为了研究CT在不同岩性地层中的运移规律,通过批量振荡平衡实验,对CT在地层中的吸附行为进行了模拟,并根据实验结果拟合了吸附等温线,推导了相关参数。实验结果表明,颗粒较细的介质对CT的吸附量较大,对CT的去除能力较强。另外,对于相同岩性的地层介质,有机质含量高的介质对CT的吸附能力较强,说明有机质含量是影响CT在地层中迁移的重要因素。

(carbon tetrachloride)CT is one of the persistent organic pollutants(POPs) in groundwater.If CT in the sweage and residues in soils finds its way into a groundwater aquifer,it will threaten the water-supply safety for human beings.Understanding the ability of soils to adsorb CT and the migration rules of CT in the formations may provide the basis for risk assessment and remediation of groundwater pollution.For the study of migration of CT in different formations,the adsorption behaviors of CT in the formations were simulated through the batch-shake-equilibrium experiment,and adsorption isotherms were fitted by using experimental results.It is suggested that the adsorption capacity of fine particle media is larger according to the experimental results.Furthermore,between two same lithologic formation media,one with high organic matter contents has a stronger adsorption ability,suggesting that organic matter contents are an important factor affecting the migration of CT in the formations.