Investigation of The Effect of Pore Sizes on DM Formation Time, and Cleaning Frequency
Keywords:Dynamic membrane, membrane flux, physical cleaning, membrane resistance
Dynamic membrane (DM) technology was applied for treatment of synthetic dairy wastewater. The study consisted of two step. In first step of the study, changes in DM formation time and solid removal efficiency were investigated at different operational conditions using support materials having different pore sizes (20 and 40 μm) in an external filtration unit being situated at the outlet of up flow sludge blanket reactor. During the operation, three runs were done for each studied pore sizes and physical cleaning was done two times for each pore sizes. DM formation time became shorter as the pore sizes of support layer decreased for the initial stages of the support layer usage. On the other hand, after DM formation, support layer lost its original properties and its filtration characteristics became independent of pore size. Solid removal at different pore sizes was followed with turbidity measurements. The turbidity removal efficiency was more than 92 % for all pore sizes. The initial flux was 97 and 95 L/m2h for 20 and 40 μm pore size, respectively. The flux after DM formation during operation with 20 μm pore size was slightly higher than 40 μm pore size. The cake layer resistance effect on total membrane resistance was evaluated for 40 μm pore size. It was calculated for run-3 as 2.34x 109 1/m corresponding 99.5 % of total resistance. According to these results, cake layer resistance composed most of the total resistance. Among the pore sizes tried, 20 μm was found to be optimum pore size considering DM formation time, flux, trans membrane pressure and treatment performance.
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