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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。
Aiming at seasonal ammonia and organic micro-polluted water sources, the biological sludge in the sedimentation tank is flocculated to the flocculation tank by the biological pretreatment after refluxing, and the conventional biological strengthening treatment is carried out. Pilot experiments of different sludge return ratio conditions show that the sludge return ratio should be selected between 1.5% and 5%, and the reflux ratio should be increased to increase the bioconcentration effect. Compared with the non-return condition of 27.6% The average removal rate of CODMn was 44.5%, 44.1% and 45.5%, respectively, when the sludge recirculation ratio was 1.5%, 3% and 5%. The mean removal rates of CODMn from the sedimentation tank were 44.5%, 44.1% and 45.5% , The sludge reflux ratio was selected from 1.5% to 5%, the dosage of flocculant was reduced by 17 mg / L, and the turbidity of sedimentation tank effluent decreased and the ammonia nitrogen removal rate also increased.