Acid whey is a by-product of greek yogurt, soft cheese or quark production. Due to the high acidic properties with pH ranging from 4.7–5.3 caused by a high number of organic ions (lactate and citrate) and a large mineral content of approximately 9–11% ODB, considered typical for natural acid whey, with total solids 5.5-6.5% (TS) make it difficult for further processing. It can’t be evaporated without using special techniques with high operational costs and due to very low sensory attributes it can’t be reused internally either.
Electrodialysis is an elegant solution for all these issues. It goes hand in hand with the removal of minerals and especially of organic ions (acids). MEGA electrodialysis units can achieve pH values according to the customer’s needs by removing the organic ions (acids) and integrated pH correction. The results of the demineralization process of acid whey make the final product suitable for food grade products.
MEGA electrodialysis units can process natural acid whey or whey concentrated up to 22% TS - 18 - 22% TS by reverse osmosis (RO) or nanofiltration (NF), which is preferred due to the partial removal of monovalent ions and organic ions. Thanks to the higher conductivity of the feed after the concentration, MEGA ED units can work at the maximum efficiency to achieve high demineralization rates like D90 (1% Ash ODB) without using ion exchange even for acid whey.