【摘 要】
：
Effective cultivation of stable aerobic granular sludge(AGS)is a crucial step in the successful application of this technology,and the formation of AGS could be facilitated by some envi-ronmental stress conditions.Four identical sequencing batch reactors(
【机 构】
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Department of Environmental Science and Engineering,Fudan University,Shanghai 200438,China;College o
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Effective cultivation of stable aerobic granular sludge(AGS)is a crucial step in the successful application of this technology,and the formation of AGS could be facilitated by some envi-ronmental stress conditions.Four identical sequencing batch reactors(SBRs)were estab-lished to investigate the aerobic granulation process under the same alternating ammonia nitrogen feeding strategy superimposed with different environmental conditions(inorganic carbon source,temperature,N/COD).Although various superimposed conditions induced a significant difference in the size,settling velocity,mechanic strength of AGS,mature aer-obic granules could be successfully obtained in all four reactors after 70 days\'operation,indicating the alternating ammonia nitrogen feeding strategy was the most critical factor for AGS formation.Based on the results of redundancy analysis,the presence of an inor-ganic carbon source could facilitate the cultivation of AGS with nitrification function,while the moderate temperature and fluctuant N/COD might benefit the cultivation of more sta-ble AGS.In addition,superimposed stress conditions could result in the difference in the microbial population between four reactors,but the population diversity and abundance of microorganisms were not the determinants of AGS formation.This study provided an ef-fective method for the cultivation of AGS by using alternating ammonia nitrogen feeding strategy.
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