An observation on sludge granulation in an enhanced biological phosphorus removal process

Ong, Y.H.; Chua, A.S.; Lee, B.P.; Ngoh, G.C.; Hashim, M.A. (2012) An observation on sludge granulation in an enhanced biological phosphorus removal process. Water Environment Research, 84 (1). pp. 3-8.

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A sequencing batch reactor (SBR) seeded with flocculated sludge and fed with synthetic wastewater was operated for an enhanced biological phosphorus removal (EBPR) process. Eight weeks after reactor startup, sludge granules were observed. The granules had a diameter of 0.5 to 3.0 mm and were brownish in color and spherical or ellipsoidal in shape. No significant change was observed in sludge granule size when operational pH was changed from 7 to 8. The 208-day continuous operation of the SBR showed that sludge granules were stably maintained with a sludge volume index (SVI) between 30 to 55 mL/g while securing a removal efficiency of 83% for carbon and 97% for phosphorus. Fluorescent in situ hybridization (FISH) confirmed the enrichment of polyphosphate accumulating organisms (PAOs) in the SBR. The observations of sludge granulation in this study encourage further studies in the development of granules-based EBPR process.

Item Type: Article
  1. Ong, Y.H.
  2. Chua, A.S.
  3. Lee, B.P.
  4. Ngoh, G.C.
  5. Hashim, M.A.
Journal or Publication Title: Water Environment Research
Additional Information: Department of Chemical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia
Uncontrolled Keywords: Sequencing Batch Reactor (SBR)
Subjects: R Medicine
Divisions: Faculty of Engineering
Depositing User: Mr. Faizal Hamzah
Date Deposited: 20 Mar 2012 09:12
Last Modified: 16 Dec 2014 12:40

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