水中颤蚓灭活实验研究

Experimental study on killing tubifex in drinking water

水源污染及水质恶化导致水体中生物群结构发生改变,部分水生物大量繁殖,由于目前不能被有效去除,致使在水厂乃至入户水中时有出现,这是给水处理中出现的一个新问题.本文对水厂中新发现的水生物—颤蚓进行了初步研究,利用次氯酸钠、过氧化氢、高锰酸钾、二氧化氯和臭氧等几种常用氧化剂对其进行了灭活试验,研究了在不同投药量、pH值、接触时间下比较几种药剂的灭活效果.结果表明,臭氧灭活效果最佳,2.5 mg/L投加量下可达100%灭活;次氯酸钠、高锰酸钾、二氧化氯在增大投药量和延长接触时间后也具有较好的效果;过氧化氢在实验条件下对颤蚓无杀灭作用.

The emergence of tubifex in the raw water is a new problem in drinking water treatment. It is easy for tubifex to get through the filter bed and reach the water tank. Sodium hypochlorite （NaClO）, hydrogen peroxide （H2O2）, potassium permanganate （KMnO4）, chlorine dioxide （ClO2）, ozone （O3） were used to inactivate and kill the Tubifex under conditions of different dosages, pH values and contact times. The experimental results indicated that the inactivation effect of ozone was better than other oxidants. The larvae can be completely killed under the conditions of 30min of contact time and 2.5mg · L^-1 of ozone dosage. The better inactivation effects of liquid chlorine （Cl2）, potassium permanganate （KMnO4 ）, chlorine dioxide （ClO2） can be obtained when increasing the chemical dosage and prolonging the contact time. However, hydrogen peroxide （H2O2 ） generally has no effect on killing Tubifex under lab conditions.