氯胺/亚氯酸盐对模拟给水管网硝化作用的控制

采用生物膜培养反应器(RAB)模拟给水管网系统,比较了氯胺和亚氯酸盐对氨氧化菌(AOB)和异养菌的灭活效果.结果表明,亚氯酸盐对水中和生物膜中AOB的灭活效率均高于氯胺,1.5mg/L氯胺对水中和生物膜中AOB的灭活速率分别为5.7×10-2log/h和4.8×10-2 log/h;而0.6mg/L的亚氯酸盐对水中和生物膜中AOB的灭活速率分别为7.2×10-2 log/h和6.4×10-2 log/h,远高于氯胺的灭活效果;亚氯酸盐与氯胺联用对AOB的灭活效果与单独亚氯酸盐作用效果相当;亚氯酸盐对悬浮态和附着态的异养菌均没有灭活作用,氯胺对水中和生物膜中异养菌的灭活速率分别为8.3×10-2 log/h和5.5×10-2 log/h;采用亚氯酸盐和氯胺联合作用可有效控制硝化作用.

Controlling Effect of Chloramines,and Chlorite on Nitrification in Simulated Drinking Water Distribution System

The inactivation effect of chloramine,chlorite for ammonia-oxidizing bacteria and heterotrophic bacteria was compared by using rotating annular bioreactors(RAB),which were applied to simulate the drinking water distribution system.The experiment results showed that 1.5 mg/L chloramine had a higher inactivate rate to AOB in bulk water(5.7×10~-2 log/h) than in the biofilm(4.8×10~-2log/h) during 24 h.Compared with chloramine,0.6 mg/L chlorite had a much higher inactivation rate to AOB in the biofilm(6.4×10~-2 log/h) and bulk water(7.2×10~-2 log/h).Chlorite and hybrid of chlorite and chloramine disinfection had almost the same inactivation efficiency,and chlorite had no inactivation effect on heterotrophic in the biofilm and bulk water.The inactivation rate of chloramine on heterotrophic bacteria was 8.3×10~-2 log/h and 5.5×10~-2 log/h respectively.Based on chlorite inactivation effect on AOB and chloramine on heterotrophic bacteria,the hybrid disinfection of chloramine and chlorite on the controlling of nitrification was put forward.