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采用窄缝槽实验装置,分别模拟岩溶水系统内单一Mn、Cr(Ⅵ)以及Mn-Cr(Ⅵ)复合体系的动态吸附、物理解吸、化学解吸3个阶段的行为特征,分析含锰、铬污水对地下水的污染规律及其相互作用.结果表明:土壤对单一体系Mn的吸附率远大于Cr(Ⅵ),但两者均以专性吸附为主,不易活化、迁移;在复合体系内均出现吸附率降低、解吸率升高,表现为以物理吸附为主,易活化、迁移,从而引起水体重金属污染;两者表现为显著的协同作用,但Mn对Cr(Ⅵ)的影响远小于Cr(Ⅵ)对Mn的影响;在酸性环境下,Mn对Cr(Ⅵ)的化学活性有轻微的抑制作用.
The characteristics of dynamic adsorption, physical desorption and chemical desorption of single Mn, Cr (Ⅵ) and Mn-Cr (Ⅵ) composite system in a karst water system were simulated by using a narrow slot experimental apparatus. The results showed that the adsorption rate of Mn to soil was much higher than that of Cr (Ⅵ), but both of them were mainly characterized by specific adsorption and could not be easily activated and migrated. In the composite system The adsorption rate decreased and the desorption rate increased, which was mainly characterized by physical adsorption, which was easy to activate and migrate, which caused heavy metal pollution in water body. Both showed synergistic effect, but the effect of Mn on Cr (Ⅵ) was far less than that of Cr (Ⅵ) on Mn. Under acidic conditions, Mn has a slight inhibitory effect on the chemical activity of Cr (Ⅵ).