NO^3-和NO2^-作为电子受体时的反硝化除磷实时控制  

Real-time Process Control of Denitrifying Phosphorus and Nitrogen Removal Systems with NO_3^- and NO_2^- as Electron Acceptors

作　　者：高大文[1,2] 李强[1] 梁红[1] 王文斌[2] 袁向娟[1] 

机构地区：[1]东北林业大学环境科学系,哈尔滨150040 [2]哈尔滨工业大学城市水资源与水环境国家重点实验室,哈尔滨150090

出　　处：《环境科学》2009年第4期1073-1078,共6页Environmental Science

基　　金：全国优秀博士学位论文作者专项研究基金项目(2005044);教育部新世纪优秀人才计划项目(NCET-05-0330)

摘　　要：采用SBR厌氧/缺氧运行方式,研究了NO3-和NO2-作为电子受体时的反硝化除磷效能及ORP与pH作为反硝化除磷过程控制参数的可行性.结果表明,反硝化除磷过程中COD、磷酸盐、电子受体浓度与体系pH和ORP的变化具有较强的相关性.在厌氧阶段,当释磷结束时,pH值平台的出现指示了释磷的结束;在缺氧阶段,吸磷结束后,ORP出现拐点,标志着缺氧吸磷的完成.另外,考察了2种电子受体(NO3-和NO2-)反硝化除磷的效能.在以NO3-为电子受体的反应中,在缺氧初期30 min反应中,平均摄磷速率为32.68 mg/(L.h),每吸收1 mg PO43--P约消耗1.14 mg NO3--N.在以NO2-为电子受体的反应中,在缺氧初期30 min反应中,平均摄磷速率为17.66 mg/(L.h),每吸收1 mg PO43--P约消耗1.57 mg NO2--N.综上,提出pH和ORP可以作为2种电子受体(NO3-和NO2-)反硝化除磷的实时控制参数,并且,以NO3-为电子受体系统在摄磷方面优于NO2-电子受体系统.The simultaneous phosphorus and nitrogen removal using denitrifying phosphate-accumulating organisms with NO3 and NO2 as electron aeceptors was investigated in an anaerobie/anoxic process. The results showed that the concentrations of COD, PO4^3 - and electron aceeptors （NO3^- and NO2^- ） have a correlation with the variation of pH and ORP during anaerobic/anoxic process. In anaerobic phase, the occurrence of pH fiat indicates the end of phosphorus release. In anoxie process, an inflexion was observed in ORP profile when the phosphorus uptake was finished. In addition, the phosphorus uptake rate was investigated in the process with different electron aeeeptors （NO3^- and NO2 ）. The average anoxic phosphate uptake rate was 32.68 mg/（L·h） in the early 30 min during anoxic phase when NO3 was as electron acceptor, and every 1 mg PO3^- -P uptake would consume 1.14 mg NO3 -N. In the process with NO2- as electron acceptor, the average anoxic phosphate uptake rate was 17.66 mg/（L＇h） in the early 30 rain, and every 1 mg PO4^3- -P uptake would consume 1.57 mg NO2^- -N. In conclusion, ORP and pH can be used as control parameters for simultaneous phosphorus and nitrogen removal in an anaerobie/anoxic process, and the system with NO3 as electron aeceptor is superior to the system with NO2^- as electron aeeeptor.

关 键 词：硝酸盐 亚硝酸盐 反硝化除磷 实时控制 ORP pH 

分 类 号：X703.1[环境科学与工程—环境工程]