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SBR工艺低溶解氧丝状菌污泥膨胀成因及控制方法

Keywords: 序批式活性污泥法(SBR),有机负荷(F/M),低氧污泥膨胀,H.hydrossis丝状菌,荧光原位杂交(FISH)

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Abstract:

采用序批式活性污泥(sequencingbatchreactor,SBR)工艺处理低碳氮比实际生活污水,研究了低溶解氧丝状菌污泥膨胀的成因及不同运行模式对低溶解氧污泥膨胀控制效果.试验结果表明,缺氧/好氧(anoxic/oxic,A/O)工艺当溶解氧(dissolvedoxygen,DO)的质量浓度ρ(DO)控制在0.5mg/L时,发生以H.hydrossis为优势菌的丝状菌污泥膨胀.当采用SBR工艺A/O运行模式,改变有机负荷(F/M)为0.83kg/(kg·d),ρ(DO)控制在2.0mg/L左右时,污泥膨胀并不能有效控制,污泥体积指数(sludgevolumeindex,SVI)一直保持在300mL/g以上.经荧光原位杂交(fluorescenceinsituhybridization,FISH)方法鉴定,优势菌种依然为H.hydrossis丝状菌,在此阶段系统总氮(totalnitrogen,TN)平均去除率为31.17%,COD平均去除率为65.04%.当采用全程好氧运行模式,改变F/M为0.37kg/(kg·d),ρ(DO)控制在2.0mg/L左右时,能有效控制污泥膨胀,SVI下降到150mL/g以下.在此阶段,NH+4-N去除率接近100%,出水ρ(NH+4-N)几乎为0,TN和COD的平均去除率分别上升为70.7%和73.9%.此阶段出水ρ(TN)和ρ(COD)平均值分别为18.4和46.9mg/L,接近国家一级A排放标准.

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