天津市和平区医院污水氯化消毒效果调查

Effect of Sewage Chloridizing Disinfection in Hospitals

目的了解天津市和平区医院排放污水的氯化消毒效果。方法采集2003、2004、2005年和平区14家医院排放的污水。每季度监测1次，采用碘量法测定医院排放污水中余氯的含量，采用多管发酵法测定废水中的粪大肠菌群数。结果和平区14家医院排放污水中余氯含量为3．1～86．9mg／L，平均为13．1mg／L；污水中粪大肠菌群数〈20个／L，符合《污水综合排放标准》（GB8978—1996）。结论和平区14家医院排放的医院污水中余氯含量偏高，对水环境造成的二次污染应引起重视。

[Objective]To understand the effect of swage chloridizing disinfection in the hospitals of Heping District of Tianjin. [Methods] Sewage samples discharged from 14 hospitals were collected and monitored quarterly from 2003 to 2005. The contents of residual chlorine in the sewage samples were determined with iodometric titration method and the fecal coliform counts of the sewage were determined using multi-tubes fermentation method. [Results]The contents of residual chlorine in the sewage of 14 hospitals were 3.1 -86.9 mg/L with an average level of 13.1 mg/L; the fecal coliform counts in the treated sewage were less than 20 cfu/L, which accorded with the National Standard for Sewage Discharge （GB 8918 - 1996）. [ Conclusion]The contents of residual chlorine in the sewage discharged from 14 hospitals in Heping district Tianjin were rather high, which might cause secondary water pollution; great emphasis should be put on the solution to this problem.