氯、二氧化氯对氯胺消毒管网硝化作用控制效果对比

摘要

采用2台串联BAR模拟给水管网系统,通过对余氯、NH4+-N、N02-N、NO3--N、DO、HPC及AOB等指标检测,评价氯和二氧化氯2种消毒剂对氯胺消毒管网中硝化作用的控制效果.研究结果表明:二氧化氯比等量氯更易提高管网中余氯质量浓度和DO质量浓度;氯消毒阶段NH4+-N降解,NO2--N和NO3--N积累,而投加二氧化氯后可有效控制硝化作用;与投加氯消毒相比,投加等质量浓度(0.6 mg/L)二氧化氯时,第1台BAR中悬浮和生物膜中HPC分别降低了2.54 log和1.63 log,悬浮及生物膜中AOB降低约1 log;二氧化氯能对AOB起到控制灭活效果而等量氯对其几乎没有灭活效果,在控制供水管网硝化作用方面,二氧化氯与氯胺联用的消毒效果优于氯与氯胺.%Two biofilm annular reactors (BAR) in series were adopted in the study,and the effects of chlorine and chlorine dioxide disinfection on nitrification were compared by analyzing residue chlorine,NH4+-N,NO2--N,NO3--N,DO,HPC and AOB.The results showed that chlorine dioxide was more effective than chlorine in enhancing the effluent concentration of residue chlorine and DO.The concentration of NH4+-N was droped while NO2--N and NO3--N were increased during the stage of chlorine,but not happening during the stage of chlorine dioxide.Compared with equivalent chorine(0.6mg/L),the chlorine dioxide was more effective in removing suspended and boifilm HPC with 2.54 log and 1.63 log reductions,respectively,and both suspended and biofilm AOB with 1 log reduction.Chlorine was ineffective in controlling AOB.Therefore,the effect of chorine dioxide combined with chloramine was better than chorine combined with chloramine in mitigating nitrification in distribution systems.