Abstract:

The enhanced coagulation experiments have been carried on by combining bleaching agent dicyandiamide 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 0.12mL/L of bleaching agent dicyandiamide and 87.5 mg/L of PAC. At this time， the decoloration rate is up to 74%，COD_Cr removing rate 57%，and UV₂₅₄ removing rate 36%. The experimental results show that the composited coagulant is highly effective.

Key words: bleaching agent dicyandiamide, enhanced coagulation, dyeing wastewater

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%，COD_Cr去除率达57%，UV₂₅₄去除率达36%，该复合混凝剂的处理效果良好。

关键词: 双氰胺脱色剂, 强化混凝, 印染废水

CLC Number: 

• X703