WATER TREATMENT APPARATUS FOR TREATING MIXED-WATER INCLUDING SURFACE WATER AND SEAWATER MIXED WITH EACH OTHER AND WATER TREATMENT METHOD USING SAME

A water treatment apparatus according to the present invention comprises: a mixture flow passage (P0) through which mixed-water (C) obtained by mixing surface water (A) and seawater (B) is delivered; a first water purification unit (L1) for treating the mixed-water (C) which is delivered through a first flow passage (P1), using a receiving well (10), a mixing/coagulation tank (20), a settling tank (30), and a filtering tank (40); a second water purification unit (L2) for treating the mixed-water (C) which is delivered through a second flow passage (P2), using a filter tank (100) and a reverse osmosis membrane tank (200); and a disinfecting tank (50) for treating the mixed-water (C) having been treated in the first water purification unit (L1) and the second water purification unit (L2). When the water treatment apparatus of the present invention is used, the water treatment apparatus can be operated using an existing general water purification facility, and thus it is possible to minimize an initial construction cost. In addition, since a water treatment process can be controlled according to the turbidity of mixed-water or brackish water which includes surface water and seawater mixed with each other, and the concentration of a total dissolved solid (TDS), reasonable and economical water treatment is possible. Especially, since the water treatment method uses mixed-water or brackish water with which seawater is mixed, the water treatment method is effective for coastal areas lacking fresh water. Un appareil de traitement d'eau selon la présente invention comprend : un passage d'écoulement de mélange (P0) à travers lequel l'eau mélangée (C) obtenue par mélange d'eau de surface (A) et d'eau de mer (B) est acheminée ; une première unité de purification d'eau (L1) pour traiter l'eau mélangée (C) qui est acheminée à travers un premier passage d'écoulement (P1), en utilisant un puits de réception (10), un réservoir de mélange/coagulation (20), un réservoir de décantation (30) et un réservoir de filtrage (40) ; une seconde unité de purification d'eau (L2) pour traiter l'eau mélangée (C) qui est acheminée à travers un second passage d'écoulement (P2), en utilisant un réservoir de filtre (100) et un réservoir à membrane à osmose inverse (200) ; et un réservoir de désinfection (50) pour traiter l'eau mélangée (C) ayant été traitée dans la première unité de purification d'eau (L1) et la seconde unité de purification d'eau (L2). Lorsque l'appareil de traitement d'eau