污染土壤及地下水修复的PRB技术及展望

PRB技术是一类就地修复污染土壤及地下水的新型技术 ,主要由注入井、浸提井和监测井3部分所组成。污染地区的水文地质学研究 ,是实施该技术的关键 ;化学活性物质的筛选、注入的部位、浓度、速率以及是否均匀分布 ,是该技术是否有效的关键要素。胶态零价铁PRB技术 ,被证明是一项修复由卤代烃、卤代芳烃和有机氯农药以及一些有毒金属 (如铬、硒、铀、砷和锝等 )引起的土壤及地下水污染的有效技术。尽管这些技术存在一定的弊病 ,但与传统的处理方法相比 ,其技术上的优势是十分明显的。可以预料 ,这一技术在我国有良好的应用前景

Study on permeable reactive barrier for the remediation of contaminated soils and groundwater

Permeable reactive barrier (PRB) is a new technical type for in situ remediation of contaminated soil and groundwater, and is composed of injection well, extraction well and monitoring well. Hydrogeologic setting is critical to application. The selection of chemical reactive substances and their injected locations, concentrations, rates and distribution are key to be an effective technology or whether the technology is working over the long term. The Fe 0 colloid PRB has been shown that it is an effective technology for the remediation of soil and groundwater polluted by chlorinated hydrocarbons, chlorinated aromatic hydrocarbons and chlorinated pesticides, and toxic metals such as chromium, selenium, uranium, arsenic and technetium. Although there are some limitations, technical advantages of the reactive barrier are very evident when compared to conventional treatment systems. Thus, the application of this new technology in our country will have a good bright future.