乳液聚丙烯酰胺生产废水预处理技术研究

Study on Pretreatment Technology in Production Wastewater of Emulsion Polyacrylamide

采用连续混凝沉淀-铁碳微电解氧化工艺对乳液聚丙烯酰胺生产中的废水进行预处理。比较了FeCl和聚合硫酸铁(SPFS)对浊度及COD的去除效果,考察了pH值变化对FeCl混凝效果的影响,分析了混凝沉淀反应模型;对比了铁碳微电解和芬顿(Fenton)氧化工艺对混凝沉淀后的上清液COD的去除率和B/C的变化。运行结果表明,FeCl对乳液型聚丙烯酰胺生产废水的混凝效果明显好于SPFS,最佳pH值为7,此时浊度去除率99%;铁碳微电解氧化工艺对COD的去除率优于Fenton氧化工艺,最佳pH值为3,此时COD去除率为93.3%,B/C由0.27提高到0.60。

The production wastewater of emulsion polyacrylamide was pretreated by continuous coagulation-sedimentation and iron carbon micro-electrolysis oxidation process.Turbidity and COD removal efficiency by FeCland poly-ferric sulfate(SPFS) were compared.Influence of pH value on coagulation effect of FeClwas investigated,coagulation sedimentation reaction model was analyzed.The COD removal rate and B/C of the supernatant after coagulation and precipitation by iron-carbon micro-electrolysis and Fenton oxidation process were compared.The operation results showed that coagulation effect of FeClis better than that of SPFS,optimum pH value is 7,the removal rate of turbidity is 99%.The COD removal rate of iron-carbon micro-electrolysis oxidation process is better than that of Fenton oxidation process,optimum pH value is 3,the COD removal rate is 93.3%,and the B/C increases from 0.27 to 0.60.