室内模拟BPRB修复阿特拉津污染地下水

设计了新型生物可渗透反应墙(BPRB)用于处理被污染的地下水。以阿特拉津为污染物,装填固定有阿特拉津降解菌(Pseudomonas W4)的磷酸化聚乙烯醇(PPVA)生物活性材料介质,前半部分以草炭土-PPVA/砂子为填料,以长期稳定地释放C、P;后半部分以珍珠岩-PPVA/砂子为填料,消耗草炭土-PPVA释放的C、P。选择V(PPVA生物活性材料)∶V(砂子)=1∶1的比例安装BPRB。在BPRB内设置曝气井,供氧方式为连续空气曝气,整个BPRB内DO质量浓度大于3 mg/L。BPRB模拟槽共运行140 d,累计进水1 213.6 L,共去除阿特拉津(19.35±1.00)g,出水中始终未检出阿特拉津。试验结果表明,在不额外添加碳源、磷源的条件下,BPRB能够长期稳定修复阿特拉津污染地下水。

Indoor simulation of BPRB remediating atrazine contaminated groundwater

The study designed an innovative bio permeable reactive barrier（BPRB）,filled with PPVA bioactive materials which immobilized atrazine degradation bacteria（Pseudomonas W4）,consisting of two parts.The former was filled with peat-PPVA and sand（V/V=1∶1）,constantly releasing C,P;the latter was filled with perlite-PPVA and sand（V/V= 1∶1）,consuming C,P released from peat.The oxygen supply was continuous air aeration in wells installed within BPRB and the DO concentration in BPRB was more than 3 mg/L.BPRB simulated slot had been running for 140 days,total inflow was 1 213.6 L,total removal of atrazine was 19.35±1.00 g,and there was no atrazine detected in effluent.With the absence of auxiliary C,P source,BPRB can stably remediate atrazine contaminated groundwater for a long term.