The present invention relates to a recovering method of an ammonia bicarbonate solution used as an osmosis solution in a water treatment apparatus using the forward osmosis, which comprises a step of introducing some of a mixed solution of separated water by the forward osmosis at a forward osmosis unit, and an ammonia bicarbonate solution used as an osmosis solution into an evaporator, and heating to separate carbon dioxide and ammonia; a step of introducing the rest of the mixed solution into at least one absorbing unit, and absorbing carbon dioxide and ammonia evaporated from the evaporator; a step of introducing the ammonia bicarbonate solution in which carbon dioxide and ammonia have been absorbed at the absorbing unit into at least one concentrating unit to concentrate; and a step of cooling the ammonia bicarbonate solution concentrated at the concentrating unit, and recovering and supplying at least some as an osmosis solution for the forward osmosis unit. According to the recovering method of an ammonia bicarbonate solution of the present invention, a tower shaped evaporator, absorbing units and concentrating units which can separate and concentrate an ammonia bicarbonate used as an osmosis solution are installed so that salts are prevented from precipitating during the process, and the ammonia bicarbonate solution used as an osmosis solution can be continuously recovered.;COPYRIGHT KIPO 2015
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