Water treatment method and apparatus

摘要

An apparatus and a method for water treatment is disclosed where a dealkalization treatment cycle is used in conjunction with a pH adjustment cycle or with a regeneration cycle or with both. The treatment cycle involves contacting untreated water with weak acid cation exchange resin, optionally followed by pH adjustment. The regeneration cycle includes contacting partially exhausted weak acid cation exchange resin with weak acid regenerants, in particular carbonic acid; use of weak acid regenerants avoids introduction of excessive deposits of inorganic salts into the environment. The water treatment system can also be arranged to permit concurrent treatment and regeneration cycles and is useful for providing treated water on demand for both home and beverage service use.