常温条件下CAST工艺亚硝酸型硝化的实现及特性  

Realization and performance of nitrification via nitrite in CAST process at normal temperature

作　　者：刘艳辉[1,2] 孙力平[1,2] 王少坡[1,2,3] 刘媛[1,2] 于静洁[1,2] 李玉友[1,2,4] 

机构地区：[1]天津城市建设学院环境与市政工程系,天津300384 [2]天津市水质科学与技术重点实验室,天津300384 [3]北京工业大学环境与能源工程学院,北京100124 [4]日本东北大学

出　　处：《环境工程学报》2011年第7期1454-1458,共5页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(50808128);国家"水体污染控制与治理"科技重大专项(2008ZX07209-006);中国博士后科学基金资助项目(20090460182)

摘　　要：采用循环式活性污泥法(CAST)处理模拟生活污水,通过控制曝气量,使反应器中DO在0.13～0.74 mg/L之间,在常温下快速实现亚硝酸型硝化,然后增大曝气量使反应器内DO在0.7～3.36 mg/L之间,控制曝气时间1.5 h,考察系统内亚硝酸型硝化的维持情况。结果表明,14℃条件下,通过先控制低溶解氧浓度再控制曝气时间的方式可以实现稳定的亚硝酸型硝化;运行一个污泥龄后,系统硝化反应结束时出水的NO2-N的累积率稳定在90%以上,系统TN去除率为68%,实验期间系统的SVI在105左右,污泥沉降性能良好,未发生污泥膨胀;对亚硝酸型硝化和常规模式下的全程硝化的硝化速率进行对比,结果表明,实现短程硝化后NH4-N的氧化速率从8 mg NH4-N/g MLSS.h降低到6 mg NH4-N/g MLSS.h,若曝气时间或曝气强度控制不当,在已经形成的稳定的亚硝酸型硝化的系统内,硝化模式易由短程硝化向全程硝化转化。Simulated domestic sewage was treated through the cyclic activated sludge technology（CAST）,results showed that through aeration duration control,partial nitrification was carried out in a lab-scale SBR at normal temperature,when DO concentration ranged from 0.13 mg/L to 0.74 mg/L,and partial nitrification was maintained for a long time when DO concentration rised to 0.7~3.36 mg/L.Accumulation rate of nitrite was steadily kept over 90%,average total nitrogen removal rate of effluent was 68% after a sludge retention time,though accumulation rate of nitrite was low and fluctuated at the initial experimental stage.The SVI of the system was about 105,during the experiment the sludge was in good settlement,no sludge bulking.At the same time,according to the comparion of nitrification rate of nitrous nitrification and complete nitrification,ammonia oxidation rate dropped from 8 mg NH4-N/g MLSS·h to 6 mg NH4-N/g MLSS·h.In addition,partial nitrification could be transformed into complete nitrification even through accumulation rate of nitrite was steadily kept,if aeration time and the DO concentration were unreasonably controlled.

关 键 词：短程硝化 常温 低溶解氧 硝化速率 

分 类 号：X703.1[环境科学与工程—环境工程]