University of the Punjab Conference Portal, 2nd International Conference on Engineering Sciences

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Optimal clarification of apple juice using crossflow microfiltration without enzymatic pre-treatment under different operation modes
fawad khan

Last modified: 2015-11-20

Abstract


In the present study, the clarification process appropriate operating values were identified by investigating the influence of temperature, transmembrane pressure (TMP) and feed flow rate on the crossflow microfiltration (CFM) process without enzymatic pre-treatment. Multichannel ceramic membrane with active filtration area 0.08494m2and nominal pore diameter of 2µm was used in lab-scale microfiltration unit to attain clarified apple juice. The experiments were performed using two modes (total recirculation mode and concentration mode). In total recirculation, the performance of flux with time was observed at feed flowrate 11 L.min-1 and at TMP of 3 and 4 bar respectively. A reduction in permeate flux was observed with time. The results showed in contrast to 3 bar run, the flux values at 4 bar was  higher but the decay in flux of permeate with time at 4 bar was more rapid. In concentration mode, the flux behavior was almost the same as in total recycle mode but the values of flux are much lower in concentration mode. The CFM has noticeable impact on physico-chemical properties of apple juice as reduction of viscosity, turbidity and soluble solids was observed. However no change in pH of apple juice was noticed. The study showed that CFM process is suitable for clarification of apple juice. The product obtained can be applied further to concentration process.