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Water Science & Technology—WST Vol 59 No 6 pp 1077–1083 © IWA Publishing 2009 doi:10.2166/wst.2009.093 Control of scum accumulation in a double stage biogas collection (DSBC) UASB reactor treating domestic wastewaterJ. O. Pereira, J. S. S. Celani and C. A. L. ChernicharoDepartment of Sanitary and Environmental Engineering, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil E-mail: calemos@desa.ufmg.brABSTRACT This paper presents an innovative reactor concept which is based on a double-stage biogas collection (DSBC) device aimed at controlling scum formation and accumulation in UASB reactors treating municipal wastewater. Scum production inside a control reactor and a DSBC-UASB reactor was compared and much lower scum yield coefficients were observed for the DSBC-UASB reactor. However, the mass balance indicated that the dominant control mechanism was scum disaggregation and exit to settler zone rather than scum degradation. Keywords: double-stage biogas collection; scum control; UASB reactor; wastewater treatment eProduct: Buy this article for £24.00 (IWA MEMBER PRICE: £18.00) All prices include VAT. For customers where VAT should not be applied, the VAT amount will be removed upon payment |
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