摘要
针对受硝酸盐污染的水源水,以琼脂为反硝化细菌的碳源和微生物载体,通过生物反硝化作用脱除水源水中的硝酸盐,并利用曝气生物滤池(BAF)去除琼脂反应器出水中残留的少量CODMn和NO2--N等污染物。实验结果表明,水源水自然接种的条件下,可以顺利启动琼脂反应器;在温度为25℃左右,琼脂反应器在进水NO3--N约25 mg/L、水力停留时间1.5 h时,能获得70%的硝酸盐氮去除率;曝气生物滤池在水力停留时间0.5 h、气水比2.8时,可控制最终出水的CODMn和NO2--N分别在5.0 mg/L和0.10 mg/L以下;琼脂反应器的脱氮效果与温度、进水NO3--N浓度及水力停留时间等有关。研究指出,琼脂反应器与曝气生物滤池构成的组合系统能较好地脱除水源水中的硝酸盐并且能控制最终出水水质,不会导致二次污染,从而获得合格的饮用水源水。
Aimed at the nitrate-polluted source water,the biological denitrification reactor with agar as the carbon source of denitrifying bacteria and the growth carrier of microbes was used to remove nitrate in source water,and the biological aerated filter（BAF） was adopted to remove the pollutants such as the residual CODMn and NO-2-N in the outflow of the agar reactor.The experimental results showed that the agar reactor started up successfully when source water was employed to inoculate the reactor.The NO-3-N removal efficiency of the agar reactor could attain 70% when the temperature was about 25℃,the HRT was 1.5 h,and the inflow NO-3-N was about 25 mg/L.The BAF could reduce CODMn and NO-2-N below 5.0 mg/L and 0.10 mg/L,respectively,when the HRT was 0.5 h and the gas-to-water flow ratio was 2.8.The performances of the agar reactor were concerned with temperature,inflow NO-3-N concentration and HRT,etc.This research indicated that the combined system of the agar reactor and the BAF could effectively remove the nitrate in source water and the ultimate outflow water quality of the system could be controlled,and the secondary pollution would not be caused.Consequently,the qualified source for drinking water could be obtained.
出处
《环境工程学报》
CAS
CSCD
北大核心
2010年第11期2527-2531,共5页
Chinese Journal of Environmental Engineering
基金
江苏省普通高校研究生科研创新计划资助项目(CX08S_020Z)
南京林业大学人才基金资助项目(G2005-06)
江苏省"青蓝工程"资助项目(苏教师(2007)2号)
关键词
琼脂
碳源
水源水
反硝化
硝酸盐
反硝化速率
agar
carbon source
source water
denitrification
nitrate
denitrifying rate
