中文摘要：

以锯末、零价铁、活性碳为反应介质,研究填装方式、接种量、停留时间等对可渗透反应墙去除硝酸盐的影响。结果表明：锯末和零价铁混合填装PRB中硝酸盐的去除率达到99.39%,高于两者分层填装的PRB;增加反应时间可以提高硝酸盐的去除率,但会增加出水的可溶性有机碳;在一定范围内增加接种量可以提高硝酸盐的去除率;硝酸盐的去除率、出水可溶性有机碳和菌落数随硝酸盐初始浓度的升高而降低,但铵态氮的积累有所升高;活性炭不仅可以促进硝酸盐的去除、降低体系中铵态氮积累,还可以改善出水色度。锯末和零价铁混合填装PRB的出水检测不到亚硝态氮,分层填装PRB的出水检测到亚硝态氮质量浓度最低为0.764 mg/L,最高为1.285 mg/L;此外,各PRB中的出水菌落数在103～106CFU/mL之间变化。

英文摘要：

To investigate the effects of different packing modes,inoculation quantites and hydraulic retention time on nitrate removal,permeable reactive barriers（PRBs） packed with sawdust,zero-valent iron（Fe0） and active carbon were tested in laboratory.The PRB filled with completely mixed sawdust and Fe0 showed higher nitrate removal efficiencies than those filled with sawdust and Fe0 in layer modes.Nitrate removal efficiencies and dissolved organic carbon（DOC） in effluent increased with hydraulic retention time increased.Within limits,increasing the amount of inoculum quantity of PRB could increase nitrate removal rate.Nitrate removal efficiency,DOC concentration and the number of bacterial colonies in effluent decreased with the initial nitrate concentration increasing,whereas the accumulation of ammonium showed an opposite trend.Addition of active carbon not only could promote the reduction of nitrate,decrease ammonium concentration but also could improve outlet water chroma.Furthermore,the nitrite could be nearly detected in the effluent,while the number of bacrteria colonies changed from 103 CFU / mL to 106 CFU / mL.