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| Enhancing aerobic granulation by seeding dewatered sludge |
| WANG Liang-jie, ZHAN Han-hui, SUN Can |
| School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China |
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Abstract Physical granular sludge formed by dewatering as seed sludge, significantly enhanced aerobic granulation. On day 20, there was 90% of sludge larger than 0.2mm in R2 seeded with physical granular sludge,and only 26.7% was in R1 seeded with flocculent sludge. The SVI of R2 maintained below 80mL/g meaning better settleability.Compared with 3200mg/L of MLSS in R1, R2 had a much higher MLSS at 6300 mg/L on day 25.In the whole process, COD removal rate of both reactor exceeded 90%, suggesting sludge activity was not obviously decreased by dewatering, but TN removal rate was about 70% in R2 superior than the 55% in R1on account of the lager particles size in R2. Experienced 5 days shearing, 39.8% of physical granular sludge were still larger than 0.2 mm providing plentiful cores for aerobic granulation, and nutrition transmission channel was formed inside physical granular sludge by endogenous digestion of EPS and gas escaping of denitrification.
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Received: 07 March 2016
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