Partitioning of calcium and magnesium (total divalent cations) during membrane filtration of milk

摘要

Partitioning of total divalent cations (TDVC) during reverse osmosis (RO), nanofiltration (NF) and ultrafiltration (UF) has been investigated. During RO, there was an increase in TDVC and Ca2+, and a reduction in the ethanol stability of RO retentates. During UP of milk at its normal pH, there was an increase in total divalent cations, but only a slight increase in Ca2+ in the retentate. There was some loss of micellar calcium during UF. However, the ratio of amounts of soluble to total divalent cations in the retentate decreased as concentration factor increased. During NF, a small amount of TDVC was found in the permeate and TDVC rejection was estimated to be about 0.83.