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低溶解氧丝状菌污泥微膨胀在A/O中的启动与维持

Keywords: 低溶解氧,丝状菌污泥微膨胀,状态可控性,曝气能耗

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Abstract:

采用实际生活污水,研究了低溶解氧丝状菌污泥微膨胀在A/O系统中的启动、维持及其调控,并考察了微膨胀过程中系统对污染物的去除效果.试验结果表明:较低的有机负荷条件(F/M为0.14kg/(kgMLSS.d))下,大幅度降低溶解氧并不一定会诱发污泥膨胀,而在正常有机负荷(F/M为0.24kg/(kgMLSS.d))下,维持溶解氧质量浓度在0.3~0.4mg/L时,系统的污泥容积指数(SVI)能稳定在150~300mL/g,发生丝状菌微膨胀;丝状菌污泥微膨胀状态可长期稳定维持,并具有高度的可控性;与高溶解氧条件相比,在低溶解氧污泥微膨胀期间,COD和TN的平均去除率有所升高,分别为85%和69%,氨氮基本能完全硝化;同时,由于丝状菌的网捕作用,出水水质中的悬浮物(SS)明显减少,且随着SVI的升高而降低;A/O系统实现并维持低溶解氧丝状菌微膨胀期间,节约曝气量约42%,有效地节约了能耗.

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