高浓度乳化液废水处理工艺及机制

Techniques and principles of high-strength oil-in-emulsions by polyelectrolytes

依托实际废水处理工程,对COD平均为32424mg/L,浊度为3500NTU的集中收集的多种高浓度乳化液废水的处理工艺和机制进行深入研究.通过确定适宜的破乳剂组合,实现混凝法高效破乳,浊度去除率达到90%以上;同时,针对破乳后出水COD过高的特点,开展了两级混凝沉淀的试验研究,在确定PAC和PAM复配比例的基础上,确定了适宜的pH值及搅拌时间.研究表明:两级混凝使废水的COD由21400mg/L降到8418mg/L,废水可生化性BOD5/COD提高到0 45,为后续的生物处理提供了保障.

Based on the practice of wastewater treating engineering, techniques and principles in the breaking of COD of 32424 mg/L and turbidity of 3500 NTU emulsions are studied. By developing suited demulsified reagent compounding-form, efficient demulsification using coagulation is finished and turbidity removal could be treated above 90%. According to COD of high value after demulsification, the ratio of PAM, PAC and the right pH and churning up time for coagulation are confirmed. The study shows that the COD removal could be treated from 21400 mg/L to 8418 mg/L, BOD5/COD was increased to 0.45, which is benifit for later biologic treating.