造纸废水的混凝处理研究

THE RESEARCH ON COAGULATION IN WASTEWATER TREATMENT OF A PAPER MILL

研究了分别使用聚合氯化铝、精制硫酸铝、三氯化铝、硫酸亚铁、聚丙烯酰胺(PAM)和用聚合氯化铝与PAM联合混凝处理广西某造纸厂生产的终端废水的效果。根据处理效果出水CODCr、出水浊度和处理成本以及经济效果综合考虑 ,以使用聚合氯化铝最为合适 ,废水pH值不用调节 ,最佳聚合氯化铝投加量为 4 0mg/L ,处理水出水水质可达国家污水排放标准 (CODCr<10 0mg/L)。

The terminal wastewater from a paper mill in Guangxi was coagulated with polyaluminium chloride, refined aluminum sulphate, aluminum chloride, ferrous sulphate and polyacrylic amide (PAM), respectively. The wastewater was also treated by the combined coagulation of polyaluminium chloride and PAM. The results have shown that polyaluminium chloride was the best coagulant according to the coagulating results,i.e.removal of COD Cr and turbidity and costs.The optimum value if throwing polyaluminum chloride was 40 mg/L. The treated water was suitable to meet the requirement of national wastewater discharge standard (ρ(COD Cr )<100 mg/L).