强化预处理乙醇废水协同除磷试验研究

酿造行业废水具有高有机物浓度、高浊、高磷等特点,对后续生物处理的十分不利。采用混凝沉淀强化处理,能够有效提高化学需氧量（COD）、悬浮物（SS）的去除率,同时降低磷浓度,对后续生物处理具有促进作用。探讨了不同混凝剂、混凝剂的投加量对混凝沉降速度和COD、浊度、磷去除效果的影响。研究表明,三氯化铁为预处理乙醇废水最佳混凝剂,在p H值为7-8时,投加量为80mg/L,沉降速度较快,COD的去除率可达59%,磷的去除率〉90%。继续投加助凝剂聚丙烯酰胺（PAM）可以提高废水的处理效果,但是不显著。

Experimental Study on Pretreatment of Ethanol Wastewater by Using Coagulation Precipitation and Dephosphorization Coupled Method

Ethanol wastewater has high concentration of organic matter, high turbidity, high phosphorus and other characteristics,which is very bad for subsequent biological treatment. Enhanced flocculation and sedimentation method can effectively improveremoval rates of COD and SS, and can decrease phosphorus concentration, which is be beneficial to subsequent biological treatment.In this paper, effects of coagulant types, coagulant dosage and pH on coagulation sedimentation rate and COD, turbidity, andphosphorus removal efficiencies were investigated. The results show that, when ferric chloride is used as coagulant for brewingwastewater pretreatment, its dosage is 80 mg/1, pH value is 7-8, the sedimentation rate is fast, COD removal rate can reach to 59% andphosphorus removal rate is above 90%. Adding coagulant aid 1 mg/L PAM can improve the treatment effect of wastewater, but theeffect is not outstanding.