核桃壳-陶粒填料曝气生物滤池去除氨氮的研究

Study on removal of ammonia nitrogen in wastewater by biological aerated filter with walnut shell and ceramic packing

对核桃壳-陶粒填料曝气生物滤池(BAF)的挂膜启动和处理效果进行了研究,同时考察不同的水力负荷、气水比、填料层高度对污染物去除效果的影响。结果表明:微生物在核桃壳-陶粒填料上成功挂膜仅需21d,运行稳定后核桃壳-陶粒填料BAF的COD、氨氮去除率分别稳定在92.0%、88.3%左右;在水力负荷为0.06~0.08m3/(m2·h)、气水比为9∶1(体积比)的条件下,核桃壳-陶粒填料BAF处理效果较好且较稳定,氨氮和COD去除率可达70%以上;填料层0~15cm段为核桃壳-陶粒填料BAF去除COD的高效段,15~30cm段为去除氨氮的高效段。

The start-up and nitrogen removal performance of the self-made biological aerated filter（BAF）with walnut shell and ceramic packing were studied.The effects of hydraulic load,gas water ratio and packing height on the pollutants removal efficiencies were investigated.The results showed that it took just 21 days for the biofilm formation of the BAF with walnut shell and ceramic packing,and the removal efficiencies of ammonia nitrogen and COD could reach stable and stayed around 92.0% and 88.3%,respectively.The optimal hydraulic load of the BAF with walnutshell and ceramic packing was 0.06-0.08 m^3/（m^2·h）,the optimal gas water ratio was 9∶1,and the corresponding removal efficiencies of COD and ammonia nitrogen were both above 70%.COD and ammonia nitrogen were mainly removed at the packing height of 0-15,15-30 cm,respectively.