分段进水多级A/O生物脱氮工艺设计研究

介绍分段进水多级A/O生物脱氮工艺的基本原理及工艺特性,并结合国外研究现状和工程应用实例,对该工艺运行操作和设计的几个重要影响因素进行了探讨。分段进水多级A/O生物脱氮工艺取消了混合液内回流,反应器段数越多,脱氮效率越高,但是工艺设计与运行也会随之变复杂,工程实际应用中多采用2~4段。各级缺氧段与好氧段的比值可采用1∶1.5。污泥回流比为50%的分段进水多级A/O三段工艺的脱氮率为78%。

RESEARCH ON DESIGN OF MULTISTAGE A/O STEP FEED BIOLOGICAL NITROGEN REMOVAL PROCESS

This paper reviews the principle and characteristics of step-feed multistage A/O biological nitrogen removal process, meanwhile, consulted with the current status of research in abroad and the project application examples, some important factors regarding the operation and design of the process are discussed. The step-feed multistage A/O biological nitrogen removal process does not apply internal mixed liquid return, the more reactors, the higher nitrogen removal rate, but the design and operation of the process will be complex as well. The quantities of reactor in project application are usually 2～4. The volume ratio of the anoxic section to the oxic section is 1∶1.5. As for three-step-feed multistage A/O biological nitrogen removal process, when the nitrogen removal at the rate of 78%, sludge return only at the rate of 50%.