生物预处理后给水沉淀池生物污泥回流净水效果的研究
Study on water purification effect of biological sludge return of water supplying` sedimentation tank following bio-pretreatment
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摘要: 针对季节性氨氮和有机微污染水源，通过回流生物预处理后沉淀池生物污泥至絮凝池，进行常规生物强化处理。不同污泥回流比工况的中试实验表明，污泥回流比宜在1.5%～5%之间选取，回流比再加大，生物强化效应不会增加；相比不回流工况27.6%的CODMn平均去除率，在污泥回流比为1.5%、3%和5%的运行工况下，沉淀池出水相对于预处理出水CODMn的平均去除率分别为44.5%、44.1%和45.5%；同时，在1.5%～5%之间选取污泥回流比，絮凝剂投加量减少了17 mg/L，并且沉淀池出水浊度降低，氨氮去除率也有提高。Abstract: For seasonal ammonia and organic micro-polluted raw water， biological sludge in sedimentation tank following bio-pretreatment was returned to flocculation tank， to enhance conventional process. Different sludge return ratio experiments showed that the sludge return ratio should be chosen between 1.5% and 5%， if it increased， the biological enhancing effect will not change better. Under 1.5%， 3%， 5% sludge return ratio， the average removal rate of CODMn in the effluent of sedimentation tank was 44.1%， 44.1%， 45.5%， respectively， comparing to 27.6% average removal rate of CODMn under no sludge return. Meanwhile， choosing sludge return ratio between 1.5% and 5%， the dosage of coagulant was reduced by 17 mg/L， and NTU of sedimentation was reduced， the removal rate of NH3-N was aslo improved.
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