IJE TRANSACTIONS B: Applications Vol. 19, No. 1 (December 2006) 1-9   

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A. A. L. Zinatizadeh

Water and Environment Division, Water and Power Industry Institute for Applied and Scientific Higher Education
Kermanshah, Iran, aliazinatiz@yahoo.com

A. R. Mohamed, M. D. Mashitah and A. Z. Abdullah

School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia
Malaysia, chrahman@eng.usm.my – chzuhairi@eng.usm.my – chmashitah@eng.usm.my

G. D. Najafpour*

Department of Chemical Engineering, Engineering Faculty, University of Mazandaran
Babol, Iran, najafpour@nit.ac.ir - najafpour8@yahoo.com

*Corresponding Author

( Received: January 25, 2005 – Accepted in Revised Form: November 02, 2006 )

Abstract    An up-flow anaerobic sludge fixed film (UASFF) bioreactor was used to treat the pretreated palm oil mill effluent (POME). In physical pretreatment, POME was pre-settled for 2 h and the supernatant was fed into the reactor. In chemical pretreatment, optimum dosages of cationic and anionic polymers were used. Experiments of pretreated POME digestion were conducted based on a central composite face-centered design (CCFD) with two independent operating variables, feed flow rate (QF) and up-flow velocity (Vup). The operating variables were varied to cover a wide range of organic loading rate (OLR) from 3.8 to 29 g COD/l.d. A stable TCOD removal efficiency of 83.5% was achieved at the highest QF (3.31 l/d, corresponding to OLR of 26 g COD/l.d) for pre-settled POME whereas only 62.2% TCOD removal was achieved with chemically pretreated POME at QF of 7.63 l/d (corresponding to OLR of 29 g COD/l.d) and that too was coupled with process instability. At comparable OLRs i.e. 16.95 g COD/l.d (QF=2.16 l/d) for pre-settled POME and 16.42 g COD/l.d (QF=4.32 l/d) for chemically pretreated POME, the VFA concentrations for the two cases were also similar.


Keywords    Pome, Pretreatment, UASFF Reactor, Central Composite Face-Centered Design (CCFD)



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