Recovery of water utilized in food industry by integrated membrane systems

In this study, the feasibility of electrodialysis (ED) and electrodeionization (EDI) methods in the recovery of brine of reverse osmosis treatment of raw well water in fruit juice enterprises has been investigated. For this purpose, studies were carried out with raw well water and reverse osmosis brine samples taken from the fruit juice factory which located in Izmir. The laboratory-scale cross-flow flat-sheet SEPA CF II GE-Osmonics membrane test system was used to produce brines in laboratory with raw well water and by using 2 different nanofiltration (NF-90 and NF-270) and 2 different reverse osmosis membranes (BW30 and AK-BWRO). Concentrated components from the membrane test system were used as feed solution in the ED system. TS-1-10 model Electrodialysis device of Tokuyama Company was used in the experiments. The diluated solution formed in ED experiments with 10 V electrical potential, was used as a feed solution in the EDI system which was the optimum condition of ED system. When it comes to studies conducted by reverse osmosis brine, the brine used as feed solution directly ED system. In these studies, diluated solution formed in ED experiments with 10 V electrical potential, which is the optimum condition, was collected and then used as feed solution in EDI system. As a result of the EDI experiments, 50% of the water is recovered and this water produced is high quality water with low conductivity. Keywords: Concentration management, electrodeionization (EDI), electrodialysis (ED), food industry, nanofiltration (NF), reverse osmosis (RO), water reuse