异养硝化型生物滤池处理高盐废水的脱氮性能及途径  

Performance and pathway of nitrogen removal from high salinity wastewater by heterotrophic nitrification biofilter

作　　者：吴雨莲 林丽媛 段金明[2,3] WU Yulian;LIN Liyuan;DUAN Jinming(School of Food and Biological Engineering,Jimei University,Xiamen 361021,China;School of Harbour and Environmental Engineering,Jimei University,Xiamen 361021,China;Municipal Key Laboratory of Pollution Control and Ecological Construction of Coastal City,Jimei University,Xiamen 361021,China)

机构地区：[1]集美大学食品与生物工程学院,厦门361021 [2]集美大学港口与环境工程学院,厦门361021 [3]集美大学,厦门市滨海城市污染控制与生态建设重点实验室,厦门361021

出　　处：《环境工程学报》2021年第7期2522-2530,共9页Chinese Journal of Environmental Engineering

基　　金：福建省科技计划引导性(重点)项目(2020Y0040);福建省自然科学基金资助项目(2016J01737);中国科学院城市污染物转化重点实验室开放基金资助项目(KLUPC20160001);鳗鲡现代产业技术教育部工程研究中心开放基金资助项目(RE201602)。

摘　　要：为了解决高盐废水生物脱氮效能低的问题,利用异养硝化型曝气生物滤池(heterotrophic nitrification biological aerationfilter,HNBAF)处理不同氮源模拟高盐废水,研究了HNBAF系统的脱氮性能,并采用^(15)N同位素示踪法测定了反应过程中产生的气态产物(N_(2)O、N_(2)),以揭示HNBAF系统的脱氮途径。结果表明:当NH4Cl作为唯一氮源时,NH_(4)^(+)-N的去除率最高可达到99.77%,NH_(2)OH-N,NO_(3)^(-)-N积累量较低,未检测到明显NO_(2)^(-)N的积累;外加中间产物NH_(2)OH-N可对NH_(4)^(+)-N去除产生抑制,而加入NO_(2)^(-)N和NO_(3)^(-)N等中间产物基本不影响NH_(4)^(+)-N的正常降解;当以KNO_(3)为唯一氮源时,NO_(3)^(-)-N的去除率最高可达到96.76%,NH_(4)^(+)-N、NO_(2)^(-)-N和NH_(2)OHN等产物积累量较低。当分别以^(15)NO_(2)^(-)、^(15)NO_(3)^(-)为氮源时,均可同时检测到^(15)N_(2)O和^(15)N_(2)。该HNBAF系统对NH_(4)^(+)-N、NO_(2)^(-)-N、NO_(3)^(-)-N和NH_(2)OH-N的去除主要包括硝化、好氧反硝化和同化等作用,主要脱氮途径为NH_(4)^(+)-N→NH_(2)OH-N→NO_(3)^(-)-N→NO_(2)^(-)-N→N_(2)O/N_(2),与此同时,NH_(2)OH-N和NH_(4)^(+)-N之间以及NO_(3)^(-)-N和NO_(2)^(-)N之间均可以相互转化。In order to solve the problem that the efficiency of biological nitrogen removal from high salinity wastewater is poor,a biological aeration filter system capable of heterotrophic nitrification(HNBAF)was used to treat simulated high salinity wastewater with different nitrogen source.Nitrogen removal performance of the HNBAF system was studied,and the corresponding gaseous products(N_(2)O、N_(2))were determined by the^(15)N isotope tracer method to reveal the denitrification pathway of the HNBAF system.The results showed when NH4 Cl served as the sole N-resource,the highest removal rate of NH_(4)^(+)-N reached 99.77%,while the accumulation of NH2 OH-N and NO_(3)^(-)-N was low,and no significant accumulation of NO_(2)^(-)-N was detected.NH_(4)^(+)-N removal was inhibited by the addition of intermediate product NH2 OH-N,while the addition of intermediate product such as NO_(2)^(-)-N and NO_(3)^(-)-N had little effect on the normal removal of NH_(4)^(+)-N.When KNO_(3)served as the sole N-resource,the highest removal rate of NO_(3)^(-)-N reached 96.76%,and the accumulations of NH_(4)^(+)-N,NH2 OH-N and NO_(2)^(-)-N were all low.Both^(15)N_(2)O and^(15)N_(2)were detected when^(15)NO_(2)^(-)and^(15)NO_(3)^(-)served as the N-resource,respectively.The removal of NH_(4)^(+)-N、NO_(2)^(-)-N,NO_(3)^(-)-N and NH2 OH-N by the HNBAF system mainly included nitrification,aerobic denitrification and assimilation,and the main pathway of nitrogen removal was NH_(4)^(+)-N→NH2 OH-N→NO_(3)^(-)-N→NO_(2)^(-)-N→N_(2)O/N_(2).Meanwhile,both the conversions between NH2 OH-N and NH_(4)^(+)-N,and between NO_(3)^(-)N and NO_(2)^(-)-N occurred.

关 键 词：异养硝化 好氧反硝化 脱氮性能 脱氮途径 高盐废水 曝气生物滤池 

分 类 号：X703[环境科学与工程—环境工程]