To provide a method and an apparatus for removing ammonia nitrogen in the water to be treated, by each of which ammonia nitrogen can be removed selectively even from the water which is to be treated and contains not only a high-concentration alkali metal ion and/or a high-concentration alkaline-earth metal ion but also ammonia nitrogen.
When ammonia nitrogen is removed by using a metal chelate resin from the water which is to be treated and contains not only the alkali metal ion and/or the alkaline-earth metal ion but also ammonia nitrogen, if the pH of the water to be treated is adjusted adequately, only ammonia can be adsorbed selectively on the metal chelate resin without adsorbing the alkali metal ion and/or the alkaline-earth metal ion on the metal chelate resin. If the metal chelate resin on which only ammonia is adsorbed selectively is regenerated, the regenerated metal chelate resin can be utilized again for removing ammonia nitrogen in the water to be treated. The ammonia recovered in the recovered regenerating liquid is separated by adding an alkali to the regenerating liquid which is used for regenerating the metal chelate resin and recovered and stripping the alkali-added recovered regenerating liquid by steam or the like.
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SATO KAZUNORI
TANIGUCHI YUKIHISA
TAKEBE NORIYUKI
