环境温度下短程硝化的低氧启动与维持  

Oxygen-limited Start-up and Maintenance of Short-cut Nitrification in SBR at Ambient Temperature

作　　者：周德钧[1] 周少奇[1] 梅丹[1] 

机构地区：[1]华南理工大学环境科学与工程学院,广东广州510006

出　　处：《中国给水排水》2012年第3期28-31,共4页China Water & Wastewater

基　　金："十一五"国家科技支撑项目(2008BAE64B05);广州市重大科技项目(2008DLB2080500)

摘　　要：采用序批式反应器(SBR)处理模拟氨氮废水,通过控制溶解氧浓度在中温下实现了短程硝化,并在较低温度下维持稳定的短程硝化。以全程硝化污泥为种泥,当溶解氧浓度从3.5～4.5 mg/L降低至0.8～1.3 mg/L时,可迅速实现NO 2--N的积累,持续运行中NO 2--N的积累率稳定在80%以上。利用随季节变化温度逐渐降低的特点,在中温下实现NO2--N的积累和氨氧化菌(AOB)的优势生长,然后随着气温的逐渐下降使AOB逐渐适应低温环境,当水温为13℃时NO 2--N的比积累速率为0.119 g/(gMLVSS.d)。单周期运行情况表明,游离氨(FA)对亚硝酸盐氧化菌(NOB)的抑制作用主要在反应前期,而游离亚硝酸(FNA)、pH值的抑制作用主要在后期。Through oxygen-limited control, short-cut nitrification was carried out in a lab-scale SBR at medium temperature and maintained stably even at low temperature. Using fully nitrified sludge as seeding sludge, NO2 - N was rapidly accumulated when DO decreased from 3.5 - 4.5 mg/L to 0.8 - 1.3 mg/L, and NO2- - N accumulation rate was maintained stably at above 80% in the subsequent operation. As the temperature decreased gradually, firstly NO2 - N accumulation and the selective enrichment of AOB were obtained at medium temperature, and then the AOB were slowly adapted to low temperature while the specific NO2 -N accumulation rate was 0. 119 g/（gMLVSS d） at 13 ℃. The single-cycle operation showed that the inhibition of NOB by FA taken place mainly in the early stage, and that by FNA and pH mainly occurred in the later stage.

关 键 词：环境温度 溶解氧 短程硝化 亚硝酸盐积累 

分 类 号：X703[环境科学与工程—环境工程]