含重金属高浓度乳化液废水的处理工艺

Treatment process of highly concentrated emulsion wastewater containing heavy metals

针对高浓度的含石油类乳化油及铜、锌等重金属离子的钢丝帘线废水,采用电絮凝—生物接触氧化—混凝沉淀的工艺进行处理。结果表明,电絮凝系统运行时,控制电流在30 A,进水p H在5.0~6.0,停留时间在30 min时处理效果最佳;生物接触氧化池污泥负荷以0.05 kg/(m3·d)为宜;混凝沉淀系统PAC、PAM加药量分别控制在70、4 mg/L时效果最佳。处理后的出水满足《污水综合排放标准》(GB 8978—1996)二类污染物三级标准要求。

The electro-coagulation-bio-contact oxidation-coagulation sedimentation process has been used for treat-ing the meridian tire steel cord wastewater containing highly concentrated emulsified oil and copper,zinc and otherheavy metal ions. The results show that the best effects can be obtained,when the electro-coagulation system is run-ning,the optimal operating parameters are as follows：the controlled current is 30 A,influent p H 5.0-6.0 and HRT30 min,the suitable sludge loads of bio-contact oxidation pond are about 0.05 kg/（m3·d）,and the dosages of PACand PAM systems are controlled at 70 mg/L and 4 mg/L,respectively. The treated effluent can meet the 3 rd standardrequirements of the 2 nd kind pollutants specified in the Integrated Wastewater Discharge Standard（GB 8978—1996）.