Testing the Applicability of Submerged Membrane and Moving Bed Bioreactor (SMBBR) Technology for Municipal Wastewater Treatment in Iraq

Abstract

In this work, development of the membrane bio.reactor has been investigated by combining a moving-bed biofilm reactor MBBR with a submerged ultrafilter membrane, 0.08 µm pore size, biomass separator. The MBBR technology utilizes the whole reactor volume for biomass growth, without suffering from “dead” spaces or short-circuiting issues and no need for sludge recirculation. This is obtained by having the biomass grow on the surface of specially engineered plastic media (biomedia or biocarriers) in the form of thin biological layers (biofilms) and have a density of around 1 g/cm3. For that reasons, the HRT will be smaller than MBR. Treatment efficiencies were found to be high with the production of a consistent high-quality effluent, irrespective of loading rates on the bioreactor. Membrane performance (fouling) is a function of the membrane flux and varies with loading rates . Stable operation was found to correlate to the fate of the low flux, 15 – 20 L/hr/m2 and HRT between 5 – 6 hr. Denitrification reaction efficiency to remove the TN was found to be optimum at 300% sludge circulation from biomass separator to anoxic tank