不同水力停留时间下两级A/O-PBG/MBBR污水脱氮性能及生物膜活性变化研究  

Study on nitrogen removal performance and biofilm activity of two-stage A/O-PBG/MBBR wastewater under different hydraulic retention time

作　　者：王博 刘永红[1] 王宁[1] 王全红 WANG Bo;LIU Yong-hong;WANG Ning;WANG Quan-hong(College of Environment and Chemical Engineering,Xi'an Polytechnic University,Xi'an 710048,China)

机构地区：[1]西安工程大学环境与化学工程系,陕西西安710048

出　　处：《化学工程师》2022年第3期37-41,共5页Chemical Engineer

基　　金：国家自然科学基金青年科学基金项目(22008188);陕西省水利厅科技计划项目(2017slkj-9);柯桥纺织产业创新研究院产学研协同创新项目(19KQZD06)。

摘　　要：本文采用两级A/O-PBG/MBBR工艺研究不同水力停留时间(HRT)条件下对模拟生活污水的脱氮过程,并对两级好氧系统中PBG填料的微生物附着量、类别及脱氢酶活性(DHA)变化进行了测定分析。结果表明,(1)在HRT为12.5h时,该系统获得最大去除能力NH_(4)^(+)-N(97.1%)、TN(90.7%)和COD(92.0%);(2)PBG填料生物附着量随HRT减小而降低(O-Ⅰ:11478.78、11071.03和10259.39mg·L^(-1)_(PBG);O-Ⅱ:12292.63、9640.49和5436.71 mg·L^(-1)_(PBG)),其中O-Ⅱ中生物膜脱落量远大于O-Ⅰ;(3)两级好氧系统中,填料生物膜脱氢酶活性随HRT减小呈现不同变化(O-Ⅰ:30.49、64.65和96.82 mg·(g·h)^(-1);O-Ⅱ:27.55、18.34和11.38 mg·(g·h)^(-1));(4)PBG填料表面和内部均附着大量丝状菌、球菌等微生物,并出现轮虫、钟虫等较长食物链,有效提高了系统内微生物总量及多样性。The two-stage A/O-PBG/MBBR process is used to study the denitrification process of simulated domestic sewage under different hydraulic retention time(HRT)conditions,and the changes of microbial attachment,category and dehydrogenase activity(DHA)of PBG filler in the two-stage aerobic system are measured and analyzed.The results show that:(1)when HRT is 12.5 h,the system obtain the maximum removal capacity of NH_(4)^(+)-N(97.1%),TN(90.7%)and COD(92.0%);(2)The bioadhesion of PBG filler decrease with the decrease of HRT(O-I:11478.78,11071.03 and 10259.39 mg·L^(-1)_(PBG);O-Ⅱ:12292.63,9640.49 and 5436.71 mg·L^(-1)_(PBG)),in which the amount of biofilm shedding in O-Ⅱ is much larger than that in O-Ⅰ;(3)In the two-stage aerobic system,the dehydrogenase activity of filler biofilm varied with the decrease of HRT(O-Ⅰ:30.49,64.65 and 96.82 mg·(g·h)^(-1);O-Ⅱ:27.55,18.34 and 11.38 mg·(g·h)^(-1);(4)A large number of filamentous bacteria,cocci and other microorganisms are attached on the surface and inside of PBG filler,and long food chains such as rotifers and bellworms appeared,which effectively improved the total amount and diversity of microorganisms in the system.

关 键 词：两级A/O MBBR工艺 HRT 脱氮 PBG填料 脱氢酶活性 

分 类 号：X703.1[环境科学与工程—环境工程]