Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 31105
Effects of Upflow Liquid Velocity on Performance of Expanded Granular Sludge Bed (EGSB) System

Authors: Seni Karnchanawong, Wachara Phajee


The effects of upflow liquid velocity (ULV) on performance of expanded granular sludge bed (EGSB) system were investigated. The EGSB reactor, made from galvanized steel pipe 0.10 m diameter and 5 m height, had been used to treat piggery wastewater, after passing through acidification tank. It consisted of 39.3 l working volume in reaction zone and 122 l working volume in sedimentation zone, at the upper part. The reactor was seeded with anaerobically digested sludge and operated at the ULVs of 4, 8, 12 and 16 m/h, consecutively, corresponding to organic loading rates of 9.6 – 13.0 kg COD/ (m3.d). The average COD concentrations in the influent were 9,601 – 13,050 mg/l. The COD removal was not significantly different, i.e. 93.0% - 94.0%, except at ULV 12 m/h where SS in the influent was exceptionally high so that VSS washout had occurred, leading to low COD removal. The FCOD and VFA concentrations in the effluent of all experiments were not much different, indicating the same range of treatment performance. The biogas production decreased at higher ULV and ULV of 4 m/h is suggested as design criterion for EGSB system.

Keywords: Expanded granular sludge bed system, piggery wastewater, upflow liquid velocity

Digital Object Identifier (DOI):

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 2464


[1] G. Lettinga, A.F.M. Van Velson, S.W. Hobma, W. de Zeeuw and A. Klapwijka, "Use of Upflow Sludge Blanket (UASB) Reactor Concept for Biological Wastewater Treatment Especially of Anaerobic Treatment", Biotechnol. Bioeng., vol. 22, 1980, pp. 699-734.
[2] F.A. McLoed, S.R. Guiot and J.W. Costerton, "Layered Structure of Bacteria Aggregates Produced in an Upflow Anaerobic Sludge Bed and Filter Reactor", Applied & Env. Micro., vol. 56, 1990, pp. 1598-1607.
[3] M.T. Kato, J.A. Field, P. Versteeg and G. Lettinga, "Feasibility of Expanded Granular Sludge Bed Reactors for the Anaerobic Treatment of Low Strength Soluble Wastewater", Biotechnol. Bioeng., vol. 44, 1994, pp. 469-479.
[4] APHA, AWWA and WEF, Standards Methods for the Examination of Water and Wastewater, 20th Ed., Washington D.C. : American Public Health Association, 1998
[5] S. Karnchanawong and K. Teerasoradech, "Laboratory-scale Study of Soft Drink Wastewater Treatment by UASB Process", Proceedings of the 8th International Conference on Anaerobic Digestion, Sendai, 25-29 May 1997, pp. 397-404.
[6] P.L. McCarty, "Anaerobic Waste Treatment Fundamentals, Part I: Chemistry and Microbiology", J. Public Works, vol. 95, 1964, pp. 91- 94.
[7] R.E. Speece and P.L. McCarty, "Nutrient Requirements and Biological Solids Accumulation in Anaerobic Digestion", Proceeding of 1st International Conference Water Pollution Resource, London : Pergamon Press, 1964
[8] R.G. Zoutberg and R. Frankin, "Anaerobic Treatment of Chemical and Brewery Wastewater with a New Type of Anaerobic Reactor : the Biobed EGSB Reactor", Wat. Sci. Tech., vol. 34(5-6), 1996, pp. 375- 381.
[9] K.M. Webb and G.E. Ho, "Struvite (MgNH4PO4.6H2O ) Solubility and its Application to a Piggery Effluent Problem", Wat. Sci. Tech., vol. 26 (9-11),1992, pp. 2229-2232.