高浓度冷轧硅钢片乳化液废水絮凝实验研究

Research on the Flocculation Experiment of High Concentration Cold Rolled Silicon Steel Emulsion Wastewater

某硅钢厂排放高浊度高浓度乳化液废水(COD 37 g/L、p H=6.5~8.5),调试现场拟采用单独投加聚合氯化铝(PAC)与混合投加(PAC+聚丙烯酰胺(PAM))两种絮凝方法对乳化液废水进行处理。通过单因素实验和正交实验确定了最佳絮凝条件为PAC投加量3500 mg/L、PAM投加量15 mg/L、p H值7.5左右,此时乳化液废水COD降至654 mg/L,COD去除率高达98.3%;该乳化液废水的破乳条件为PAC投加量≥2250mg/L、p H≥7.0;对比单独投加PAC与混合投加(PAC+PAM)的处理效果,结果表明,尽管COD去除率变化不大,但由于PAM助凝效果明显,故建议在实际工程中采用混合投加(PAC+PAM)。

A silicon steel plant discharges high-turbidity high-concentration emulsion wastewater （COD 37 g/L, pH=6.5-8.5）. The commissioning site intends to adopt two kinds of flocculation methods to treat the emulsion wastewater, separately addition poly aluminum chloride （PAC） and mixing addition PAC ＋ polyacrylamide （PAM）. Through single factor experiments and orthogonal experiments, the optimal flocculation conditions were as follows： PAC dosage 3500 mg/L, PAM dosage 15 mg/L pH value 7.5, the COD of emulsion wastewater decreased to 654 mg/L, the removal rate of COD was 98.3 %; the emulsion demulsification wastewater conditions PAC dosage ≥2250 mg/L pH ≥7.0; Compared with PAC ＋ PAM alone, the results showed that although the effect of PAC coagulation is obvious, it is suggested that PAC＋PAM）.