METHOD AND APPARATUS FOR REALIZING HETEROTROPHIC AND AUTOTROPHIC COUPLING ADVANCED NITROGEN REMOVAL AND SIMULTANEOUS SLUDGE REDUCTION AOA-SBR

摘要

A method for realizing heterotrophic and autotrophic coupling advanced nitrogen removal and simultaneous sludge reduction in an anaerobic-aerobic-anoxic sequencing batch reactor (AOA-SBR) is disclosed. Municipal sewage and sludge fermentation mixture is allowed to simultaneously enter into the AOA-SBR; in the anaerobic stage, the organic matter in the sewage and sludge fermentation mixture is converted into polyhydroxyalkanoates (PHA) and stored in the body; in the aerobic stage, the dissolved oxygen (DO) at 0.5˜1 mg/L is maintained by a real-time control, the aeration time is set for 1˜3 h, and when the mass concentration ratio of NO₂⁻—N to NH₄⁺—N is in a range from 1.5 to 2.0, the aeration is stopped, that is, ammonia-nitrogen is partially converted into nitrite-nitrogen through short-cut nitrification; in the anoxic stage, the remaining ammonia-nitrogen and nitrite-nitrogen undergo anaerobic ammonia oxidation (anammox), and meanwhile the remaining nitrite-nitrogen and nitrate-nitrogen generated by anammox is reduced by denitrifying bacteria to nitrogen to achieve advanced nitrogen removal. A related apparatus is also provided, which simultaneously realizes advanced nitrogen removal of sewage and reduction of sludge.