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厌氧-局部循环供氧生物膜技术处理农村污水

Keywords: 模拟农村污水,间歇排放,水解酸化,局部循环供氧,生物膜,脱氮除磷

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Abstract:

通过模拟农村生活污水水质和间歇进水特点,利用"厌氧-局部循环供氧生物膜"技术,研究该工艺对有机物、氮、磷的去除效果。厌氧池和局部循环供氧池有效容积比为1:1.6,曝气装置位于局部循环供氧池中间底部,环形导流板将局部循环供氧池分隔成中间好氧区和四周缺氧区,斜管沉淀池前置到厌氧池与局部循环供氧池之间,出水端设置循环水池。装置连续稳定运行12个月,平均进水量为140L/d,生物反应区HRT为1.3d。监测结果表明,出水COD、BOD、NH3-N、TN和TP平均浓度分别在40.31、3.38、2.69、11.98和0.75mg/L,达到了国家城镇污水处理厂污染物排放指标(GB-18918-2002)中的一级排放标准。研究表明,厌氧-局部循环供氧技术是一种适合农村分散污水处理的新工艺,可有效减轻农业面源污染。

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