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体积比对分段进水工艺处理低浓度废水性能的影响

Keywords: 分段进水,脱氮除磷,废水,体积比,碳源有效利用率

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Abstract:

采用改良A2/O四点分段进水工艺处理低浓度、低碳氮比城市生活污水.在HRT为8.7h、SRT为15d、污泥回流比为75%、进水流量分配比为20∶35∶35∶10、好氧段ρ(DO)为1~1.5mg/L条件下,通过调整不同的厌氧/缺氧/好氧体积比,分析体积比对污染物去除性能的影响.结果表明:不同的体积比对COD、氨氮的去除基本无影响,但对TN、TP去除影响较大.当厌氧/缺氧/好氧体积比为4∶8∶10时,对污染物去除效果最佳,出水COD、氨氮、总氮、总磷质量浓度分别为28.12、0.58、9.26、0.43mg/L,进水碳源有效利用率达72.4%.通过逐步减少好氧段体积以提高缺氧段体积的策略,可使进水碳源在各缺氧段或厌氧段被充分利用,同时有利于反硝化除磷菌的富集,DPAOs最高比例为20.9%.

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