Method and apparatus for desalinating sea water
AssigneeKobelco Eco-Solutions Co., Ltd.
InventorsYutaka Ito, Masanobu Noshita, Kazutaka Takata, Mitsushige Shimada, Noboru Miyaoka, Kenji Takesaka
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Abstract
An object is to provide a fresh water generating method that is capable of efficiently producing purified water, such as fresh water, from unpurified water, such as sea water. Provided is a fresh water generating method for generating fresh water by way of reverse osmosis membrane filtration, which includes mixing sea water with low salt concentration water having a salt concentration lower than sea water to produce mixed water, and subjecting the mixed water prepared by the mixing to reverse osmosis membrane filtration, thereby generating fresh water.
Claims6
A sea water desalinating method for desalinating sea water by way of filtration using a reverse osmosis membrane device, comprising carrying out a wastewater treatment step of subjecting inorganic wastewater to precipitation and separation to produce sedimentation treated water, filtering the sedimentation treated water by using a clarifier that has at least one of a sand filtration means, a microfiltration membrane and an ultrafiltration membrane to produce permeate, and filtering the permeate using a first reverse osmosis membrane device to produce permeate that is purified water and concentrated water, a mixing step of mixing, as diluent water, the concentrated water into sea water to produce mixed water, and a mixed water treatment step of feeding the mixed water produced by the mixing step to a second reverse osmosis membrane device, at which the mixed water is filtered, thereby desalinating sea water.
A sea water desalinating apparatus for desalinating sea water by way of filtration using a reverse osmosis membrane device, comprising a sedimentation treatment part that subjects inorganic wastewater to precipitation and separation to produce sedimentation treated water, filters the sedimentation treated water by using a clarifier that has at least one of a sand filtration means, a microfiltration membrane and an ultrafiltration membrane to produce permeate, and filters the permeate using a first reverse osmosis membrane device to produce permeate that is purified water and concentrated water, a mixed water treatment part that mixes, as diluent water, the concentrated water into sea water to produce mixed water, and feeds the mixed water produced by the mixing to a second reverse osmosis membrane device, at which the mixed water is filtered.
Dependencies are inferred from the claim text.