3种运行模式下CAST工艺脱氮性能  

Nitrogen removal performance of CAST process with three operation modes

作　　者：刘媛[1,2] 王少坡[1] 刘艳辉 孟健 于静洁[1] 孙艾萱[1] 孙力平[1] 李玉友[2] 

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]东北大学大学院环境科学研究科 [3]中煤邯郸工程有限公司,邯郸056032

出　　处：《环境工程学报》2014年第4期1278-1284,共7页Chinese Journal of Environmental Engineering

基　　金：国家"水体污染控制与治理"科技重大专项(2012ZX07308-002);天津市自然科学基金资助项目(10JCYBJC05300)

摘　　要：以模拟城市污水为处理对象,采用循环式活性污泥法(CAST)反应器,对3种运行模式(M1:常规模式,M2:缺氧好氧模式、M3:缺氧好氧交替模式)下系统的脱氮性能进行了研究,比较了各模式下CAST反应器的氨氮和总氮的去除效率,并对各模式下典型周期内氮基质浓度变化进行了考察,以确定系统的脱氮模式。结果表明,在氨氮去除不成为限制条件(去除率>90%)的条件下,3种运行模式下系统总氮的平均去除率分别为67.3%、70.6%和82.4%,以缺氧好氧交替模式下的最高;M1、M2和M3均可实现亚硝酸型硝化,但随着温度的升高,亚硝酸型硝化逐渐消失。静态实验分析表明,3种模式下系统的氨氧化速率大小次序为:vN:M1>vN:M2>vN:M3,反硝化速率大小次序为:vDN,M2>vDN,M3>vDN,M1。Fed with simulated domestic sewage, three reactors were operated under three operational modes （ M1 ： conventional mode, M2 ： anoxic-aerobic mode, M3 ： alternant anoxic-aerobie mode） in order to evaluate the nitrogen removal performance of cyclic activated sludge technology （CAST） system. The removal efficiencies of total nitrogen in three operational modes were analyzed. In addition, in order to investigate the nitrogen removal pathway, nitrogen concentrations of a typical cycle under three operation modes were analyzed. Results showed that when NH4＋ -N removal efficiencies were above 90% , the average removal effieiencies of total nitrogen under three operational modes were 67.3% , 70.6% , 82.4% , respectively. Furthermore, nitrification via nitrite was a- chieved under all operation modes. However, along with the rising of temperature, nitrification via nitrite disap- peared. The static tests demonstrated that the ammonia oxidation rates under three operation modes were ：vN：M1〉vN：M2〉vN：M3 and denitrifieation rates were：vDN,M2〉vDN,M3〉vDN,M1

关 键 词：循环式活性污泥法 生物脱氮 亚硝酸型硝化 硝化速率 反硝化速率 

分 类 号：X703.1[环境科学与工程—环境工程]