两种PRB反应介质去除地下水中硝酸盐效果对比

目的]研究可渗透反应屏（PRB）技术不同介质对地下水中硝酸盐的去除效果。方法]模拟地下水环境,以硝酸盐污染的地下水为研究对象,设计2个PRB反应器,分别采用负载生物介质、零价铁-活性炭两组反应材料作为PRB装置的反应介质,考察其对污染的地下水中硝酸盐的去除效果。结果]当水温为13～15℃、PH值7.2～7.5时,负载生物介质硝酸氮去除率可持续达到90%左右,COD的去除率也稳定保持在80%左右;零价铁-活性炭反应介质硝酸氮去除率稳定停留在50%左右,COD得去除率保持在15%～30%之间。结论]负载生物介质的去除效果更稳定,相对较好,以负载生物介质作为反应材料的PRB用于原位浅层地下水中硝酸盐污染的治理具有潜在的应用价值。

The Contrast about Removal Effects on Nitrate in Groundwater for Two Reaction Medium of PRB

Objective]The aim was to research the removal effects on nitrate in groundwater for different reaction medium of PRB.Method]According to the simulated groundwater and with the nitrate contamination of groundwater as material,the removal effects on nitrate in groundwater for immobilized microorganisms and zero-valent iron and activated carbon reaction mediums of PRB were reviewed.Result]The results showed that when the water temperature is 13-15 ℃ and pH 7.2-7.5,nitrate removal rate of immobilized microorganisms could sustainably achieve 90%,COD removal rate was also maitained at 80%;nitrate removal rate of zero-valent iron and activated carbon reaction medium maitained 50%,COD removal rate was 15%-30%.Conclusion]The removal rate of Immobilized microorganisms was higher and better.so the PRB with immobilized microorganisms as reaction media had potential applications for the treatment of nitrate polluted groundwater.