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[Cultivation of aerobic granular sludge for simultaneous nitrification and denitrification in SBR system].

The cultivation of aerobic granular sludge used for nitrogen removal in Sequencing Batch Reactor (SBR) fed with a synthetic municipal wastewater was investigated. The results showed that the aerobic granular sludge with the high activity of simultaneous nitrification and denitrification, could form in the reactor by controlling the addition of carbon source, and the removal rates of COD and NH3-N reached 74.0%-92.8% and 82.3%-98.5%, respectively, in the reactor. The granular formed was averagely 0.5-1.0 mm in diameter, and the Mixed Liquid Suspended Solids (MLSS) and the Sludge Volumetric Index (SVI) in the reactor were above 4.5 g/L and above 32.5, respectively. Compared with the normal aerobic activated sludge process, the system with aerobic granular sludge had a higher concentration of effective biomass and a much stronger ability of nitrogen removal.