阴离子聚丙烯酰胺处理医院污水的研究

摘要

研究自制的阴离子聚丙烯酰胺（APAM）对医院污水（色度125倍、悬浮物含量1241 mg/L、COD 2351 mg/L）的絮凝特性，并探讨聚合氯化铝（PAC）对APAM的助凝作用，考察了APAM的投加量、分子量对絮凝效果的影响。结果表明：加入PAC 66.0 mg/L、APAM 1.2 mg/L，对原水的絮凝效果最佳，色度降低率61.60%，悬浮物含量（SS）降低率67.61%，COD降低率20.88%。色度、SS、COD降低率均优于市购的APAM（Mw＞1000×104、Mw＞2000×104）。%The flocculability of anionic polyacrylamide (APAM) to treat hospital sewage was studied, which has the chromaticity of 125, SS of 1244 mg/L and COD of 2336 mg/L. The polymeric aluminium was chosen as the coagulant to enhance the flocculability of APAM. The effect of concentration and molecular weight of APAM was studied in this research. The result showed that under the optimum condition (PAC 66 mg/L, APAM 1.2 mg/L) , the decrease ratio of chromaticity, SS and COD are 61.60%, 67.61% and 20.88% respectively. Meanwhile, the decrease ratio of chromaticity, SS and COD were better than commercial APAM with the molecular weight of Mw>1000×104 and Mw>2000×104.