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DOI : ,    Vol.19, No.1, 19 ~ 26, 2011
Title
Configuration of Bioreactor for High-rate Sludge Granulation
현길수 Kil Soo Hyun , 이형옥 Hyeong Ok Lee
Abstract
This study was performed to investigate an optimum configuration of bioreactor for high-rate sludge granulation using synthetic wastewater. Seed sludge for forming granules was taken from the aeration tank in existing treatment plant. As a result, the reductions of COD were >70% at DO <2mg/L and >80% at DO >3mg/L, respectively. This indicates that DO concentration of >3mg/L is appropriate for efficient organic reduction. Sludge volume index (SVI) decreased from 100 mL/g to 40 mL/g, while settling time of the reactor increased 10m/h to 30m/h. This is due to that granules size increased 0.4mm to >1.2mm. The fraction of granules decreased non-linearly for settling time and linearly for discharge time, while it increased with the increase of exchange ratio. Therefore, the results indicate that a greater height/diameter (H/D) ratio of the bioreactor is needed to form a good granules and enhance substrate reduction.
Key Words
Bioreactor, DO, SVI, settling time, granule size, height/diameter ratio
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