Abstract: An object is to provide a fresh water generating apparatus that is capable of efficiently and stably producing fresh water. Provided is a fresh water generating apparatus equipped with a seawater-treating reverse osmosis membrane device that produces fresh water from seawater by a reverse osmosis membrane, including a mixing section that mixes wastewater as dilution water with seawater to produce mixed water, and a first seawater-treating reverse osmosis membrane device that acts as the seawater-treating reverse osmosis membrane device to filter the mixed water, in which the apparatus is configured so that used water that is wastewater resulting from the use of the produced fresh water as service water is mixed as dilution water with seawater at the mixing section.

Abstract: An object of the present invention is to provide a fresh water generating apparatus that is capable of efficiently producing fresh water according to an intended use, while utilizing wastewater. Provided is a fresh water generating apparatus equipped with a seawater-treating reverse osmosis membrane device that produces fresh water from seawater by a reverse osmosis membrane, which includes: a mixing section that mixes wastewater as dilution water with a portion of seawater to be subjected to membrane treatment to produce mixed water; a first seawater-treating reverse osmosis membrane device that acts as the seawater-treating reverse osmosis membrane device to filter the mixed water; and a second seawater-treating reverse osmosis membrane device that acts as the seawater-treating reverse osmosis membrane device to filter the remaining portion of the seawater to be subjected to membrane treatment, in an unmixed state with the dilution water.