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• W106549510 abstract "Application of air flow is a promising hydrodynamic technique for membrane fouling control in submerged membrane separation systems. This thesis investigates the effect of operating conditions and hydrodynamic parameters on membrane fouling during submerged membrane microfiltration. The experiments were conducted under different operating conditions such as the application of various air flow rates, permeate flux rates, the addition of external materials (granular activated carbon: GAC, ferric chloride: FeCl3) and with different feed properties (varying viscosity) for model feed suspension (kaolin clay). Membrane fouling was examined with the different geometries of air diffuser plates that generate different sizes of air bubbles. Additionally, this study reports on the effect of adsorbents on the removal of organic matter during the microfiltration of synthetic wastewater.Membrane fouling was evaluated with a popular hydrodynamic approach: the application of air flow in submerged flat sheet membrane microfiltration. The investigation focused on the measurement of transmembrane pressure (TMP), particle deposition (fouling) and particle size distribution to assess membrane fouling under a variety of filtration conditions. The experimental results show that an increase in air flow rate reduces TMP as well as particle deposition for all the operating conditions studied. Conversely, an increase in permeate flux causes higher TMP development. The linear relationship between the TMP and particle deposition has been established for different air flow and permeate flow rates. Based on experiments, a particle deposition mathematical model was developed for a high concentration of kaolin clay in suspension. In the case of a higher viscosity of feed, elevated TMP indicated higher fouling; however, TMP was reduced by increasing the flow of air bubbles (higher air scour).The high energy requirement for air flow systems is a challenging issue in submerged membranes, and this study therefore suggests alternative techniques for optimising the air flow rate and limiting fouling. The addition of external material (support medium) in the kaolin suspension caused a further reduction in membrane fouling that was the result of air scour only. Almost the same reduction in TMP was obtained by adding a support medium instead of doubling the air flow rate. Therefore, the addition of a support medium with low air flow could offer a good alternative for the control of fouling in a submerged membrane microfiltration system. Furthermore, different geometries of air diffuser plates had a significant influence on the performance of the submerged membrane microfiltration. Improved reductions in TMP and particle deposition were observed with the circular aerator (small bubbles) rather than the square aerator (large air bubbles). The results in this study highlight that the effectiveness of the air flow depends on the geometry of the aerator plates and the consequent production of different sizes of air bubbles. The optimisation of the combined…" @default.
• W106549510 created "2016-06-24" @default.
• W106549510 creator A5028497695 @default.
• W106549510 date "2012-01-01" @default.
• W106549510 modified "2023-09-27" @default.
• W106549510 title "Hydrodynamic Study on Fouling Control in Submerged Membrane Microfiltration" @default.
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