▎ 摘　　要

NOVELTY - Physicochemical hardening of groundwater with high hardness based on composite modified macroporous resin, comprises hardening removal system consisting of a soft water pump, and a softener, removing hardening of reverse osmosis (RO) concentrated water with a calcium ion (Ca2+) concentration greater than or equal to 114 mg/l and magnesium ion (Mg2+) concentration greater than or equal to 68 mg/l using resin trap. In the above system: the softener can remove the divalent cations in the RO concentrated water through the composite modified macroporous resin arranged in the softener, so that the Ca2+ concentration in the water flowing out of the hardening system is less than or equal to 0.5 mg/l. USE - The method is useful for physicochemical hardening of groundwater with high hardness based on composite modified macroporous resin. ADVANTAGE - The method avoids the electrodialysis system formed by calcium sulfate fouling risk.