Abstract:In this study, actual domestic sewage with low C/N ratios was taken as substrate, aerobic granular sludge (AGS) was cultivated in a sequence batch reactor (SBR) without adding extra carbon source. The results showed that AGS was successfully cultivated within 30 d. The MLSS and SVI of mature AGS were about 4.5 g·L?1 and 50 mL·g?1, respectively, and its average size was 608.3 μm. The SBR was continuously operated for longer than 180 d. During the running period, the average removal rates of COD, TN and TP were 87.5%, 78.5%, and higher than 70% when the substrate of actual domestic sewage with the C/N ratio of 2~6, respectively. The nitrogen and phosphorus removal experiments for AGS along the typical cycle showed that the simultaneous and high efficient nitrogen and phosphorus removals could be achieved. Nitrogen removal was mainly attributed to the simultaneous nitrification and denitrification. The unique layered structure of AGS could ensure the progress of the denitrification process inside the granular sludge with a high external dissolved oxygen environment. Key words:actual domestic sewage/ aerobic granular sludge/ low C/N ratio/ nitrogen and phosphorus removal.
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1.College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China 2.Beijing Enterprises Water Group (China) Investment Limited, Beijing 100102, China Received Date: 2019-12-17 Accepted Date: 2020-03-01 Available Online: 2020-11-11 Keywords:actual domestic sewage/ aerobic granular sludge/ low C/N ratio/ nitrogen and phosphorus removal Abstract:In this study, actual domestic sewage with low C/N ratios was taken as substrate, aerobic granular sludge (AGS) was cultivated in a sequence batch reactor (SBR) without adding extra carbon source. The results showed that AGS was successfully cultivated within 30 d. The MLSS and SVI of mature AGS were about 4.5 g·L?1 and 50 mL·g?1, respectively, and its average size was 608.3 μm. The SBR was continuously operated for longer than 180 d. During the running period, the average removal rates of COD, TN and TP were 87.5%, 78.5%, and higher than 70% when the substrate of actual domestic sewage with the C/N ratio of 2~6, respectively. The nitrogen and phosphorus removal experiments for AGS along the typical cycle showed that the simultaneous and high efficient nitrogen and phosphorus removals could be achieved. Nitrogen removal was mainly attributed to the simultaneous nitrification and denitrification. The unique layered structure of AGS could ensure the progress of the denitrification process inside the granular sludge with a high external dissolved oxygen environment.