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循环速率及低温环境对复合生态床修复北方景观水体的影响

Keywords: 循环速率,生态床,景观水体,低温

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Abstract:

以天然矿物质沸石及煤渣为基质构建新型复合生态滤床,分层布设并采用下向流-上向流联合运行方式,修复北方微污染景观水体.通过出水循环方式下的动态实验,考察循环速率、低温环境对污染物去除过程的影响,深入分析水体氮、磷在系统内的转换过程及修复机理.结果表明,加快循环速率提高了NH_4~+-N及TN的去除率,且使得硝化作用进行得更加迅速和彻底,补充了氮从系统中去除的好氧反硝化途径.温度下降过程中,动态运行24h及48h的去除率无明显变化,TP去除率明显降低,分别由15~25℃时的72%、77.4%降低到0~5℃的42.4%及60.2%;温度是TP去除的主要影响因索,对NH_4~+-N影响不大.

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