Abstract
Novel tri-bore hollow fiber membranes have been developed from polyvinylidene fluoride (PVDF) for the control the dissolved oxygen (DO) in aquaculture denitrification process. The fabricated hollow fibers are characterized in terms of morphology, porosity, hydrophobicity and mechanical strength. Two membrane modules, each including 200 pieces of hollow fibers, are connected in series or parallel in order to determine the optimum operation mode. The deoxygenation test is firstly conducted for DI water and then for aquaculture water. Various methods including water flushing, air blowing or chemical cleaning have been applied to assure the cleaning efficiency after membrane fouling. A mathematical model has been developed by using the resistance-in-series concept by taking into account boundary layer and membrane characteristics. Overall mass transfer coefficient, radial and axial concentration profiles, and molar flux of oxygen at different water flow rates are calculated. This work has demonstrated that the developed tri-bore hollow fiber membranes are applicable for the control of dissolved oxygen in aquaculture water. The observations have provided solid evidence for the development of membrane-based denitrification system for recirculating aquaculture system (RAS).
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