摘要
Two biological nitrogen removal processes are compared in the aspect of nitrogen removal, process operation and energy saving. Results show that when the returned sludge ratio is 50% of the inflow rate, the step-feeding process achieves over 80% total nitrogen （TN） removal efficiency, but the TN removal efficiency of the A/O process is only 40%. Moreover, filamentous sludge bulking can be well restrained in the step-feeding process. Given the conditions of a returned sludge ratio of 100% and a nitrifying liquor recycle ratio of 200%, the TN removal efficiency is 78.32% in the A/O process, but the sludge volume index （SVI） value increases to 143 mL/g. In the step-feeding process, the SVI is only 94.4 mL/g when the TN removal efficiency reaches 81. 1%. The step-feeding process has distinct advantages over the A/O process in the aspects of practicability, nitrogen removal and operating stability.
从脱氮率、工艺运行以及节能角度对A/O工艺与分段进水2种生物脱氮工艺进行比较.结果表明,当污泥回流比为50%的条件下,分段进水工艺能达到高于80%的总氮去除率,但是A/O工艺只能达到40%.在污泥回流比为100%、硝化液回流比为200%的条件下,A/O工艺能够达到78.32%的总氮去除率,但是SVI值将达到143mL/g.而达到同样甚至更高的总氮去除率(81.1%),分段进水工艺的SVI值只有94.4mL/g.分段进水工艺中污泥膨胀得到很好的控制.分段进水工艺在适用性、脱氮率、运行稳定性方面优于A/O工艺.
基金
The Project of Scientific Research Base and Scientific Innovation Platform of Beijing Municipal Education Commission (No.PXM2008-014204-050843)
the Project of Beijing Science and Technology Committee (No.D07050601500000)
the Knowledge Innovation Program of the Chinese Academy of Sciences (No.RCEES-QN-200706)
the Special Funds for Young Scholars of RCEES,CAS.
