初沉池改造为回流污泥反硝化池最佳进水比例研究

Optimum Feed Ratio of Primary Settling Tank Transformed as Denitrification Tank of Recycle Sludge

为强化脱氮除磷,需要对由初沉池改造的回流污泥反硝化池的进水比例进行优化。该文结合污水厂改造模拟试验,通过对比烧杯试验研究了不同进水比例下混合液的反硝化速率。结果表明:在污水厂出水总氮量达到国标一级A标准时,通过回流污泥3.2 h的内源反硝化,回流污泥反硝化池出水中NO3-的质量浓度不超过1.5 mg/L,由初沉池改造的回流污泥反硝化池的最佳进水比例为0%。

In order to remove nitrogen and phosphorus enhancedly,the feed ratio of denitrification tank of recycle sludge transformed from primary settling tank should be optimized.Combining a simulation experiment about the transforming of wastewater treatment plant,the denitrification rate of mixed solution made up of recycle sludge and different ratio feed is studied based on comparative jar tests in this study.The result shows that：when the total nitrogen in effluent of wastewater treatment plant arrives Grade A of national discharge standard,by endogenous denitrification of recycle sludge with 3.2h,the mass concentration of NO-3 in denitrification tank of recycle sludge is no more than 1.5 mg/L,and 0% is an optimum feed ratio of denitrification tank of recycle sludge transformed from primary settling tank.