COD、NO₃^--N与后置曝气对A₂SBR反硝化除磷的影响

张兰河,刘强,贾艳萍,马军

1.哈尔滨工业大学市政环境工程学院;2.城市水资源开发利用(北方)国家工程研究中心;3.东北电力大学化学工程学院



摘要:

为考察COD、硝态氮及后置曝气对反硝化除磷系统的影响,采用A2SBR工艺进行长期实验室研究.结果表明:在进水COD质量浓度为200～250 mg/L和磷酸盐质量浓度为4～6 mg/L时,厌氧段出水COD去除率达80%,缺氧段磷酸盐去除率达92%;在缺氧段,硝态氮进水质量浓度为35 mg/L时,磷酸盐出水质量浓度最低为0.34 mg/L,NO3--N去除率达98.4%.后置曝气能够有效去除水中残余磷酸盐,使磷酸盐的去除率高达99%,并且能够明显改善污泥的沉降性能.

关键词:  反硝化除磷  COD  硝态氮  后置曝气

DOI：10.11918/j.issn.0367-6234.2011.06.011

分类号:X703.1

基金项目:城市水资源与水环境国家重点实验室开放基金项目(QA201013);吉林省科技发展计划应用基础研究项目(20090599)



Effect of COD,NO₃^--N and post-aeration on A₂SBR denitrifying dephosphorization process



1.School of Municipal and Environmental Engineering,Harbin Institute of Technology,150090 Harbin,China;2.National Engineering Research Center of Urban Water Resources,150090 Harbin,China);3.School of Chemical Engineering,Northeast Dianli University,132012 Jilin,Jilin, China;4.National Engineering Research Center of Urban Water Resources,150090 Harbin,China

Abstract:

To investigate the effect of COD,NO3--N and post-aerobic on denitrifying dephosphorization process,a lab experiment was carried out by using an anaerobic/anoxic sequencing batch reactor(A2SBR) for a long time.The results show that when the influent COD is between 200 to 250 mg/L and PO43--P is between 4 mg/L to 6 mg/L,the removal efficiency of anaerobic COD,anoxic PO43--P is 80% and 92%,respectively,and when the influent of NO3--N is 35 mg/L,the effluent PO43--P concentration is lowest(0.34 mg/L) and the removal efficiency of PO43--P is 98.4%.Post-aeration can effectively remove the residual phosphate and the removal efficiency of PO43--P is up to 99%,meanwhile,post-aeration can significantly improve the sludge settling characteristics.

Key words:  denitrifying dephosphorization  COD  NO3--N  post-aeration