THE EFFECTS OF AIR SPARGING ON TUBULAR MICROFILTRATION IN TREATING PRIMARY SEWAGEKATAYON SAED, MEGAT JOHARI MEGAT MOHD NOOR, AZNI IDRIS, ABDUL GHANI LIEW ABDULLH EAKHRUI RAZI AHMADUN AND SULEYMAN A. MUYIBP
This study represented the effects of air sparging on flux enhancement in microfiltration membranes for treating primary sewage samples with and without coagulation process. The experimental results demonstrated that air sparging was able to increase steady state flux about 10-12 times for raw sample and 1.5-3 times for coagulated sample. Moreover, it was noticed that the higher the flow rate of air sparging, the higher was the flux enhancement, as for both raw and coagulated samples the highest steady state flux was recorded for highest flow rate of sparged air applied (15 L/min). Comparison between the results obtained with air sparging on raw and coagulated sample in microfiltration membranes showed that flux was increased only in the case of highest flow rate of sparged air (15 L/min), while the steady state fluxes for coagulated sample under lower flow rates (5 and 10 L/min) were found less than those without coagulation. Moreover, coagulation was found to be effective in terms of turbidity removal in which turbidity removal percentage for coagulated samples were found to be 1.3 to 2 times greater than those obtained for samples without coagulation. The highest turbidity removals (95-97%) were recorded when air was not sparged during the microfiltration, compared to those under air sparging (42-85%).
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