铬渣中Cr(VI)在土壤-地下水中的微界面过程与迁移机制研究

Large quantities of chromium waste stockpiled over the years amount to 16 million tons in China, of which the water-soluble and carcinogenic Cr (VI) ss serious harm to the environment and human health. Cr (VI) migration mechanism and the overall model in soil-groundwater environment are rarely researched at home and abroad, which is a serious obstacle to the comprehensive Treatment of contaminated sites in order to achieve the sustainable development of chromium related industries. This research proposed a overall migration model solution for Cr (VI) in soil-groundwater environment. For the chemical speciation of chromium in the chromium slag, the factors affecting the release of Cr (VI) dissolution leached out from chromium slag, the soil adsorption characteristics of Cr (VI) and the characteristics of Cr (VI) migration in soil were summarized. Through a series of basic studies, this project aims at achieving the rainfall chromium slag Cr (VI) release patterns and dynamic leaching simulation, analyzing the mechanisms of migration in the soil - groundwater environment, and establishing of a overall transport model to provide a theoretical and technical support for regional environmental risk management..Intends to study: ① the kinetic mechanism of Cr( VI) leaching from Chromium slag; ② the micro-interfacial processes of Cr (VI) in the soil-groundwater environment; ③ the transport mechanism and model of Cr (VI) in soil-groundwater environment.

我国含铬废渣历年堆存量达1600万吨，铬渣中含有水溶性致癌物Cr(VI)，对环境与人体健康的危害十分严重。目前国内外针对Cr(VI)在土壤-地下水中的微界面过程以及基于微界面迁移机制的模型研究较少，不利于指导铬渣堆放场地土壤与地下水污染的综合防治。本研究针对铬渣中铬的赋存形态，基于前期工作已实验总结了的铬渣中Cr(VI)溶解释放的影响因素、土壤与地下水中Cr(VI)的吸附特性及迁移特征，通过系列基础问题的研究，揭示铬渣中Cr(Ⅵ)淋溶浸出的动力学机理，建立动态淋溶仿真模型, 解析其在土壤-地下水中的微界面过程和迁移机制，实现模型表征，为区域污染防治与风险管理提供理论依据和技术支持。.拟研究：①铬渣中Cr(VI)淋溶浸出的动力学机理；②Cr(Ⅵ)在土壤-地下水中的微界面过程；③Cr(Ⅵ)在土壤-地下水环境中的迁移机制与模型。

我国含铬废渣历年堆存量达1600万吨，铬渣中含有水溶性致癌物Cr(VI)，对环境与人体健康的危害十分严重。目前国内外针对Cr(VI)在土壤-地下水中的微界面过程以及基于微界面迁移机制的模型研究较少，不利于指导铬渣堆放场地土壤与地下水污染的综合防治。本研究针对铬渣中铬的赋存形态、铬渣中Cr(VI)溶解释放的影响因素、土壤与地下水中Cr(VI)的吸附特性及迁移特征，通过系列基础问题的研究，揭示铬渣中Cr(Ⅵ)淋溶浸出的动力学机理，建立动态淋溶仿真模型, 解析其在土壤-地下水中的微界面过程和迁移机制，实现模型表征，为区域污染防治与风险管理提供理论依据和技术支持。