氯化法处理医院废水的研究

介绍了次氯酸钠法和液氯法2种目前常用的处理医院废水的方法.对2家医院的废水处理过程进行了测试及实验研究.结果表明,这2家医院的废水处理后细菌总数和余氯量未达到国家规定的排放标准.主要原因是加氯量不精确,加氯后的停留时间不足,不能有效杀死废水中的病菌.对加氯量和停留时间的实验研究表明,每吨医院废水中次氯酸钠和液氯的最佳投入量分别为90 g和9 g,加氯后的停留时间不少于60min.

A STUDY ON CHLORINE IN TREATING HOSPITAL SEWAGE

Due to its particular trade property and the various harmful compositions in the wastewater, it is quite typical and specific to treat hospital sewage. In the present paper two ways to disinfect hospital sewage for the time being. They are to use liquid chlorine and sodium chloroacetate. Each of them has their own advantages and disadvantages. The paper aims to analyze some commonly encountered problems with the above-mentioned ways and then puts a suggestion on their improvement by using pH, COD, the fecal coliform, the total germs and the remnant chlorine, which constitute some important indexes for evaluating the hospital sewage purification extent. The test was made before and after the treatment in the two hospitals in a county town. The results show that the total germs and remnant chlorine in the sewage fail to reach the national standard value. The mainly reason is that come up with the hospital sewage treatment, one being the short of enough chlorine for the purpose and the other-lack of enough time for adding chlorine. Thus, the final result of experiment proves that the best quantity putting the sodium chloroacetate into each one-ton sewage amount to 90 grams and the liquid chlorine amount to 9 grams. The remaining time should be longer than 60 minutes so that the grimes can be fully eliminated. Hence, the results prove satisfactory.