EXPERIMENTS ON BIOMASS TRANSPORT INSIDE UPFLOW SLUDGE BLANKET REACTORS INTERMITTENTLY FED
Main Article Content
Abstract
This work describes the experimental activities developed to study the biomass transport
phenomena occurring in upflow anaerobic reactor influencing the biomass washout. The
experimental investigations have been carried outon pilot UASB fed with the aim to determine the
height to which washout is affected by: daily flow distribution; upflow velocity; concentration and
sedimentation properties of the biomass. The experiments had shown a considerable influence on
the biomass behavior of the time interval between two successive feeds of the reactor. It was found
that, if this period is more than 1 hr larger losses of the biomass into the effluent were obtained,
independent of the upflow velocity. Shorter time periods give rise to a regular sludge expansion of
the interface even with very high upflow velocities (up to 4 m/hr), and accordingly exhibit limited
sludge washout.
Article Details
Section
How to Cite
References
BARBER WP and STUCKEY DC (1999) The use of anaerobic baffled reactor (ABR) for wastewater treatment Water Res. 33 (7)1559-1578.
GARUTI G, DOHANYOS M and TILCHE A (1992) Anaerobic-aerobic wastewater treatment system suitable for variable population in coastal areas Water Sci. & Technol. 25 (12) 185-195.
GROBICKY A and STUCKEY DC (1991) Performance of the Anaerobic Baffled Reactor under steady-state and shock loading conditionsBiotech. Bioeng. 37 344-355.
LETTINGA G, VAN HELSEN AFM, HOBMA SW, DE ZEEUW W and KLAPWIJK A (1980) Use of the upflow sludge blanket (USB) reactor concept for biological wastewater treatmentBiotech. Bioeng.22 699-734.
LETTINGA G and HULSHOFF POL LW (1991) "UASB-Process design for various types of wastewaters". Water Sci. Technol. 24 (8) 87-107.
MAZZOLANI G, PIROZZI F and D’ANTONIO G (1998) "A generalized settling approach in the numerical modeling of sedimentation tanks". Water Sci Tech. 31 (3) 95-102.
NACHAIYASIT S and STUCKEY DC (1997) " The effect of shock loads on the performance of an Anaerobic Baffled Reactor (ABR). 1 – Step changes in feed concentration at constant retention time". Water Res. 31 (11) 2737-2746.
OROZCO A (1997) "Pilot full-scale anaerobic treatment of low-strength wastewater at suboptimal temperature (15°C) with a hybrid plug flow reactor". Water Res. 28 (15) 267-276
STANDARD METHODS (1989) " Standard Methods for the Examination of Water and Wastewater" (17th edn.). Edited by Clesceri LS, Greenberg AE and Trussel RR. APHA, AWWA, WPCF.