组合工艺处理宣纸废水的实验研究

采用絮凝-酸析-电解-活性污泥工艺对宣纸废水进行处理,结果表明:絮凝段,pH值为9.8、聚合硫酸铝絮凝剂的最佳用量为50mg/L;酸析段,对絮凝处理出水进行处理,最佳pH值为4.0;电解段,处理酸析处理出水,电解质KMnO_4最佳用量200mg/L、电解80min时,色度去除率达到82.4%,处理出水色度为32倍,但出水COD_(Cr)仍很高,废水的可生化性大大提高;活性污泥段,电解出水稀释3.1倍时,处理后出水COD_(Cr)为178.4mg/L。

Study on Treatment of Black Liquor from Xuan Paper Production with Combined Process

In this experiment,flocculation - acid precipitation - electrolytsis - activated sludge process is used to treat the black liquor from Xuan Paper Production.The result shows:1)in flocculation stage,the optimal pH is 9.8,the dosage of polymeric aluminum floculant sulphate is 50mg/L;2)in acid precipitation stage,the effluent from the flocculation stage is treated,the suitable pH is 4.0;3)the effluent from acid precipitation stage is continuously treated in electrolysis stage,the electrolyte is potassium permanganate and its dosage is 200 mg/L,the time of electrolysis is 80 rain,the removal rate of chroma is 82.35 %,the chroma in the effluent is 32 times.Although the concentration of COD_(Cr)is still high,the biodegradability of the treated wastewater is improved;4) in the stage of activated sludge process,when the influent is diluted by water with the ratio of 3 to 1,the concentration of COD_(Cr)in effluent is 178.36mg/L.The chroma in final discharged water meets the requirement of A level of"The integrated wastewater discharge standard",COD_(Cr)meets the B level of it.