不同生物脱氮路径下氧气、碳源等需求理论分析

Theoretical Analysis of Oxygen and Carbon Source Demand under Different Biological Nitrogen Removal Pathways

生物脱氮是一种节约资源能源、环保安全的脱氮途径,但其反应复杂、路径众多,在不同的条件下找到合适的途径进行高效生物脱氮就成了必须要解决的问题。借助生物脱氮方程式进行理论分析,全面介绍了全程硝化+全程反硝化、短程硝化+短程反硝化、短程硝化+厌氧氨氧化和全程硝化+部分反硝化+厌氧氨氧化等四种常用的生物脱氮路径的特点,并计算了不同脱氮路径中理论的氧气、碳源、碱度的消耗量和活性污泥的产生量。研究分析发现,以CANON工艺为代表的短程硝化+厌氧氨氧化路径相比全程硝化+全程反硝化路径,可节约56%的氧气、100%的BOD5、44%的碱度,少产生81%的污泥;全程硝化+部分反硝化+厌氧氨氧化路径相比全程硝化+全程反硝化路径,可节约42%的氧气、77%的BOD5,少产生63%的污泥。

Biological nitrogen removal is an energy-efficient,resource-saving,and eco-friendly process for nitrogen removal.However,pathways involved in biological nitrogen removal are numerous and complex,which means that finding the right pathway to fulfill biological nitrogen removal under different conditions has become a key issue.In this paper,a theoretical analysis regarding the specific feature of each pathway is conducted based on chemical/biochemical equation,including complete nitrification+complete denitrification,short-cut nitrification+short-cut denitrification,short-cut nitrification+anaerobic ammonium oxidation,and complete nitrification+partial denitrification+anaerobic ammonium oxidation.The theoretical consumption of oxygen demand,carbon source,and alkalinity as well as sludge production of each pathway were calculated and evaluated.Compared with the complete nitrification+complete denitrification pathway,the short-cut nitrification+anaerobic ammonium oxidation pathway(CANON)can save 56%O2,100%BOD5,and 44%alkalinity,and reduce 81%excess sludge production;42%O2,77%BOD5 were saved and 63%excess sludge production was reduced by the complete nitrification+partial denitrification+anaerobic oxidation pathway.