单级活性污泥同步硝化—反硝化工艺基础研究

Granular sludge which is of high activity and rapid settling ability was cultivated in an SBR reactor under aerobic conditions. Simultaneous nitrification and denitrification were obtained with the sludge. Continus experiment with synthetic substrates similar to municipal wastewater showed that the process was stable and effective. COD, NH3-N and total nitrogen removal efficiencies could reach 95%, 97% and 60-70%, respectively，even though organic and nitrogen loading rates were operated as high as 2.4 kgCOD/m3.d and 0.24 kgNH3-N/m3.d. The effluent water quality could meet the requirement of State Comprehensive Discharging Standard (GB8978-1996). Batch tests showed that carbonaceous activity and nitrification rate were as high as 0.16 kg COD/kg SS.h and 4.6 g NH3-N/kg SS.h. SVI of the sludge was less than 100 ml/g. The results certified the proposed theory, that is, simultaneous nitrification-denitrification of municipal wastewater can be carried out in a single activated sludge process.

研究曝气条件下同步硝化—反硝化活性污泥颗粒的增大条件和机制；活性污泥颗粒尺度与同步脱氮效率之间的相关关系；入流中碳源基质在曝气池中的反硝化利用效率；硝化菌和反硝化菌在污泥颗粒上的分布，为单级活性污泥的高效同步硝化—反硝化提供科学依据和理论基础。