COD、NO_3^--N与后置曝气对A_2SBR反硝化除磷的影响

Effect of COD,NO_3^--N and post-aeration on A_2SBR denitrifying dephosphorization process

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.

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.