双氰胺脱色剂强化混凝处理印染废水

摘要

将双氰胺脱色剂与聚合氯化铝进行复配,对某印染厂的二级处理出水进行强化混凝试验,确定了最佳的混凝剂复配比及混凝条件.研究结果表明:混凝剂的最佳复配比为双氰胺脱色剂0.12 mL/L、PAC 87.5 mg/L,此时脱色率达74％,CODcr去除率达57％,UV254去除率达36％,该复合混凝剂的处理效果良好.%The enhanced coagulation experiments have been carried on by combining bleaching agent dicyandi-amide and PAC for treating the secondary effluent water in a printing & dyeing plant. The optimum composited ratio and coagulation conditions are determined. The results show that the best composited ratio of the coagulant is 0.12 mL/L of bleaching agent dicyandiamide and 87.5 mg/L of PAC. At this time, the decoloration rate is up to 74% , CODcr removing rate 57% , and UV254 removing rate 36%. The experimental results show that the composited coagulant is highly effective.