腐殖酸・高岭土・铜在多孔介质中的迁移及相互作用

摘要

Objective] The study aimed to control the pollution of heavy metal in groundwater.[Method]The static adso-rption experiment and dynamic simulation experiment is adopted to compare the adsorption of humic acid and kaolinite for copper and the influence of porous media.[ Result] The results showed that the copper dampened kaolinite migration in the porousmedia , kaolinite colloid in the porous media is increased of the deposition, lead to kaolinite migration of copper in promoting effect is not obvious , the humic acid reduces the colloid deposi-tion while it promotes the migration of copper, In the process of dynamic migration, humic acid and k-aolinite have a competitive adsorption on copper, while kaolinite occupies the point of adsorption of humic acid on quartz sand, which promotes the migration of humic acid.[Conclu-sion] Redu-cing the content of humic acid in groundwater can reduce the concentration of heavy metals in the groundwater .%[目的]控制重金属在地下水深处污染。[方法]采用静态吸附试验和动态模拟试验比较了腐殖酸和高岭土对铜的吸附及其在多孔介质中的迁移。[结果]铜的存在抑制了高岭土在多孔介质中的迁移，高岭土胶体在多孔介质中沉积量增大，导致高岭土对铜的迁移促进作用不明显，腐殖酸降低了胶体沉积的同时促进了铜的迁移，在动态迁移过程中腐殖酸和高岭土对铜产生了竞争吸附，同时高岭土占据了腐殖酸在石英砂上的吸附点位，促进了腐殖酸的迁移。[结论]减少地下水中腐殖酸含量可以降低重金属在地下水深处的富集。