Simulation of Low Rejection and the High Rejection RO Membranes in Concentration of Clarified Apple Juice

摘要

In order to produce highly concentrated apple juice, two stage concentration system which consisted of a low rejection RO membrane and a high rejection RO membrane is developed. We studied the simulation method of the permeate flux and the rejection of clarified apple juice on the low rejection RO membrane and the high rejection RO membrane. In case of RO concentration of clarified apple juice, the permeate flux is lower than the sucrose and glucose solution and the rejection is higher than the sucrose and glucose solution because of fouling of the RO membrane. The influence of the fouling was considered on the simulation of RO concentration of clarified apple juice.In the case of the low rejection RO membrane, the permeate flux value and the observed rejection were satisfacorily simulated using the parameters (reflection coefficient, solute permeability and pure water permeability) which were calculated for one experimental condition based on concentration polarization equations and transport equations.In the case of the high rejection RO membrane, the permeate flux value is satisfactorily simulated using the correction coefficient of pure water permeability which was calculated for one experimental condition.