Performance of Membrane Bioreactor (MBR) in High Phosphate Wastewater

Authors: Aida Isma M. I., Putri Razreena A. R., Rozita Omar, Azni Idris

Abstract:

This study presents the performance of membrane bioreactor in treating high phosphate wastewater. The laboratory scale MBR was operated at permeate flux of 25 L/m2.h with a hollow fiber membrane (polypropylene, approx. pore size 0.01 - 0.2 μm) at hydraulic retention time (HRT) of 12 hrs. Scanning electron microscopy (SEM) and energy diffusive X-ray (EDX) analyzer were used to characterize the membrane foulants. Results showed that the removal efficiencies of COD, TSS, NH3-N and PO4 3- were 93, 98, 80 and 30% respectively. On average 91% of influent soluble microbial products (SMP) were eliminated, with the eliminations of polysaccharides mostly above 80%. The main fouling resistance was cake resistance. It should be noted that SMP were found in major portions of mixed liquor that played a relatively significant role in membrane fouling. SEM and EDX analyses indicated that the foulants covering the membrane surfaces comprises not only organic substances but also inorganic elements including Mg, Ca, Al, K and P.

Keywords: Membrane bioreactor (MBR), membrane fouling, phosphates, soluble microbial products (SMP).

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1327814

References:

[1] L.L. Blackall, G. Crocetti, A.M. Saunders, P.L. Bond, A review and update of the microbiology of enhanced biological phosphorus removal in wastewater treatment plants, Antonie Van Leeuwenhoek Int. J. Gen. Mol. Microbiol. 81 (2002) 681-691.
[2] G. Akay, B. Keskinler, A. Cakici, U. Danis, Phosphate removal from water by red mud using crossflow microfiltration,Water Res. 32 (1998) 717-726.
[3] E. Oguz, Removal of phosphate from aqueous solution with blast furnace slag, J. Hazard. Mater. 114 (2004) 131-137.
[4] Judd, S., The status of membrane bioreactor technology. Trends in Biotechnology 26(2). (2008), 109-116.
[5] I.-S. Chang, P. Le Clech, B. Jefferson and S. Judd, Membrane fouling in membrane bioreactors for wastewater treatment, J. Envir. Eng., 128 (2002) 1018-1029.
[6] N. Cicek, W. Yang and J. Ilg, Critical review of membrane bioreactors: worldwide research and commercial applications in North America, In: MBR5, Cranfield University, 2005.
[7] S. Rosenberger and M. Kraume, Parameters influencing filterability of activated sludge in membrane bioreactors. Proc. AWWA Membrane Technology, Atlanta, 2003.
[8] APHA, Standard Methods for the Examination of Water and Wastewater, 20th ed., American Public Health Association/American Water Works Association/ Water Environment Federation, Washington, 1998.
[9] M. Dubois, K.A. Gilles, J.K. Hamilton, P.A. Rebers, F. Smith, Colorimetric method for determination of sugars and related substances, Anal. Chem. 28 (1956) 350-356.
[10] E.H. Lowry, N.J. Rosebrough, R.A. Lewis Far, R.J. Randall, Protein measurement with the folin phenol reagent, J. Biol. Chem. 193 (1951) 265-275.
[11] B. Fr├ÿlund, R. Palmgren, K. Keiding, P.H. Nielsen, Extraction of activated sludge biopolymers by a cation exchange resin, Water Res. 30 (1996) 1749-1758.
[12] Meng FG, Zhang HM, Yang FL, Liu LF. Characterization of cake layer in submerged membrane bioreactor. Environ Sci Technol (2007);41:4065-70.
[13] Huang L, Morrissey MT. Fouling of membranes during microfiltration of surimi wash water: roles of pore blocking and surface cake formation. J Membr Sci (1998);144:113-23.
[14] You HS, Huang CP, Pan JR, Chang SC. Behavior of membrane scaling during crossflow filtration in the anaerobic MBR system. Sep Sci Technol (2006);41:1265-78.