絮凝-膜法处理甲壳素生产废水的试验

A Test of Flocculation-Membrane Method for Treatment of Waste Water from Chitin Production

采用絮凝-膜法处理ρ(CODCr)为8500mg/L左右的甲壳素生产废水,实验考察了pH值、絮凝剂、助凝剂对废水的絮凝处理效果。结果表明:当废水的pH值为5～9,聚铁、聚铝、聚丙烯酰胺的质量浓度分别为100mg/L,75mg/L和20mg/L时,絮凝处理的效果较好,废水的ρ(CODCr)能降至5000mg/L左右。经絮凝处理后的废水再经截留相对分子质量为6000～10000的中空聚砜膜超滤和聚酰胺复合纳滤膜处理,废水的ρ(CODCr)分别降至3910mg/L和170mg/L左右。

A flocculation-membrane process was used for the treatment of wastewater from chitin production, the ρ(CODCr) of which was around 8 500 mg/L. The effects of pH value, flocculating agent and coagulant aids on the coagulation treatment of the waste water in the test were studied. The results showed that when the pH value of the waste water was 5 ~ 9, the mass concentrations of PFS, PAC and PAM were 100 mg/L, 75 mg/L and 20 mg/L respectively, the result of the flocculation treatment was better and the ρ(CODCr) of the effluent water reduced to about 5 000 mg/L. After the flocculation treatment, the waste water was further treated by UF using hollow polysulfone film, whose relative molecular mass was 6 000~10 000, and NF using polyamide compound nanofiltration film, so that the ρ(CODCr) of the waste water reduced to 3 910 mg/L and 170 mg/L respectively.