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Study on Environment Controlling of Aerobic Granular Sludge Formation and Its Stabilization

Author: LiHao
Tutor: YuanLinJiang
School: Xi'an University of Architecture and Technology
Course: Environmental Engineering
Keywords: aerobic granular sludge Sequencing Batch Reactor Simultaneous Nitrification and Denitrification (SND)
CLC: X703
Type: Master's thesis
Year: 2008
Downloads: 48
Quote: 0
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Abstract


Aerobic granular sludge is granular cultivated in aerobic waste water treating system via microbial aggregated themselves.Compared with conventional activated sludge system,aerobic granular is stronger and densed in structure,more stabile and easily separated from water.Used aerobic granular sludge process,reactor can be maintained with the large amount of biomass.The system can leave out the second settling tank and returned sludge device and greatly reduced area.Compared with anaerobic granular sludge,the aerobic granular sludge is more stable when used to treat the organic wastewater of low concentration and the start-up period is much shorter than that of the anaerobic granular sludge.Based on the latest research findings on cultivating of aerobic granular sludge in both domestic and aboard,the research changed the traditional idea and adopted with small ratio of height to diameter SBR reactor under pure aerobic condition by synthetic wastewater,the aerobic granular sludge was cultivated.Morphologies and biological characteristics as well as effects of operation parameters on them were investigated during the formation of aerobic granular sludge in this experiment.Basic property and formation mechanism were discussed too.The removal of COD and NH3-N was studied in the formation process of aerobic granular sludge.Granules were used in the primer research on simultaneous nitrification and denitrification.The sludge bulking and stability of aerobic granular sludge was studied finally.Aerobic granular sludge was formed after 60 days in the SBR reactor with small ratio of height to diameter with pure aerobic condition.The color of aerobic granular sludge appeared yellow with compact structure and the mature granular was smooth and approximate roundness or ellipse with the diameter of about 1mm.The Sludge Volumetric Index（SVI）and the Mixed Liquid Suspended Solids（MLSS）of granular sludge system were 44mL/g and 5.1 g/L respectively.The average removal of COD and NH3-N reached nearly 87%and 89%respectively.The differences of granular morphology were investigated in different settling time such as 15min and 5min in the experiment. This showed that granules were more compact and regular in 5min settling time.The differences removal of COD and NH3-N in one reaction cycle at different air flow 2L/min and 1L/min were investigated.It was found that the removal of COD after one hour in one cycle was 85%when air flow was 2L/min.It was similar with air flow of 1L/min,the removal of COD after one hour in one cycle was 77%under this condition. But to the removal of NH3-N,the air flow of 2L/min was better than 1L/min.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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