乙二胺接枝型絮凝剂处理有机工业废水的研究

Study on treating organic-industrial wastewater by ethylenediamine-grafted flocculant

以聚丙烯酰胺、甲醛、乙二胺为原料,按照曼尼奇反应机理合成一种新型阳离子絮凝剂——乙二胺接枝型絮凝剂,实验表明,制备接枝型絮凝剂的最佳的条件为:聚丙烯酰胺∶甲醛∶乙二胺反应物质的量比=1∶1.40∶0.67,pH=10,温度=45℃,时间=4 h。实验证实接枝型絮凝剂处理模拟有机工业废水得到良好的效果:对于含苯废水COD为450.326 mg/L,经处理后剩余COD为66.502 mg/L,去除率达到了88.44%;对于含烃废水为695.060 mg/L,处理后剩余COD为65.990 mg/L,去除率达到了90.19%,均达到了国家规定的一级工业废水排放标准(COD≤100 mg/L)。

A new type of cationic flocculant——ethylenediamine-grafted flocculant was synthesized based on Mannich reactions from polyacrylamide,formaldehyde,ethylenediamine.The optimum conditions of the grafted flocculant was determined as follows：the molar ratio of polyacrylamide,formaldehyde and dimethylamine was 1∶1.40∶0.67,pH was 10,the temperature of reaction was 45 ℃ and the time of reaction was 4 h.Ethylenediamine-grafted flocculant＇s treatment of simulated industrial wastewater were showed to obtain remarkable efficiency：COD of contained benzene waste water was 450.326 mg/L,after processing the residual of COD was 66.502 mg/L.The elimination rate was 88.44%.COD of contained hydrocarbon wastewater was 695.060 mg/L with the grafted flocculant residual COD was 65.990 mg/L,removal efficiency reached 90.19%,which meets the Grade-I of national industrial wastewater emission standard.