同步硝化反硝化(SND)影响因素的试验研究

Study on the affecting factors of simultaneous nitrification and denitrification(SND)

在序批式活性污泥反应器（SBR）内，以模拟的城市污水为处理对象，研究碳源种类、DO及MLSS等因素对同步硝化反硝化（SND）脱氮效率的影响．研究表明，在试验条件下，啤酒＋淀粉的混合物较乙酸钠、葡萄糖等易降解的有机物更适合作为SND的碳源；将DO控制在0、5—1．5mg·L^-1的范围内时，体系内均能较好地实现SND生物脱氮，并且其效率随系统内DO浓度的升高而降低，在DO浓度为0．5mg·L^-1时，TN去除率达到93．74％；得出SND适宜的MLSS为5000mg·L^-1．并结合理论分析，对SND机理进行了探讨。

The effect of carbon source＇ s type, DO concentration and MLSS on the nitrogen removal efficiency of SND is studied in sequencing batch reactor （SBR） treating synthetic municipal wastewater. Results show that the mixture of beer and starchy, compared with sodium acetate and glucose, is more appropriate to be used as carbon source of SND. Controlling DO concentration at 0.5 - 1.5 mg · L^- 1, good SND can be attained in the system, and the nitrogen removal efficiency decreased with the increased of DO concentration, when DO concentration is at 0.5 mg · L^- 1, TN removal efficiency can be 93.74%. Meanwhile it concludes that the appropriate MLSS is 5000mg · L^-1 for SND. Combination the theory, this paper studies the mechanism of SND.