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反硝化生物滤池深度脱氮机理

Keywords: 生物滤池,深度处理,生物膜,反硝化作用,生物脱氮

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Abstract:

研究了反硝化生物滤池对污水中硝酸盐氮的脱氮机制及其影响因素。结果表明,在实验室小试条件下,反硝化生物滤池启动14d后出水基本达到稳定,NO-3-N和TN的去除率分别为80%~88%和76%~80%,COD的去除率达到80%以上。稳定运行期,在室温20~29℃、水力负荷为1.5~2m3/(m2·h)、COD/TN为3.7~4.5的条件下,反应器对NO-3-N和TN的去除率分别为70%~85%和47%~64%,且在运行过程中出现了少量NO-2-N的积累。分析反硝化生物滤池沿水流方向有机物浓度及氮形态分布发现,沿水流方向NH+4-N浓度基本保持不变;NO-2-N浓度在滤层底部至40cm高处积累较为明显,其后浓度基本不变。

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