# US 9,517,951 B2 · Apparatus and method for the seawater pre-treatment for desalinating seawater into fresh water > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,517,951 B2 - Document ID: US9517951B2 - Status: Granted - Kind: B2 - Application number: 14/820,052 - Filed: 2015-08-06 - Published: 2016-03-10 - Granted: 2016-12-13 - Earliest claimed: 2014-09-05 - Applicants: Un Young Lim; Jeong Seo Lim - Inventors: Un Young Lim; Jeong Seo Lim - Web page: https://patentgrep.com/patent/US9517951B2 ## CPC - C02F 1/441: {by reverse osmosis} - B01D 61/025: {Reverse osmosis; Hyperfiltration} - B01D 61/08: Apparatus therefor - B01D 65/02: Membrane cleaning or sterilisation {; Membrane regeneration} - C02F 1/001: {Processes for the treatment of water whereby the filtration technique is of importance (C02F1/44 takes precedence; construction of filters in general B01D24/00 - B01D41/00)} - C02F 2103/08: Seawater, e.g. for desalination - C02F 2303/16: Regeneration of sorbents, filters - Y02A 20/131: Reverse-osmosis - C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes) - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE ## Abstract Disclosed are an apparatus and method for the seawater pre-treatment to remove salt from seawater. The seawater pre-treatment apparatus for desalinating seawater into fresh water comprises: a seawater pre-treatment unit, located at a predetermined depth of a sea floor, for obtaining a pre-treated water by removing impurities from the seawater; a pre-treatment water tank, located on the ground, for accommodating the pre-treatment water tank produced by the pre-treatment unit; and a connection flow channel for connecting the pre-treatment unit and the pre-treatment water tank such that the pre-treated water can be transported. The seawater pre-treatment apparatus and method are capable of simplifying the configuration of the entire apparatus while reducing the consumption of energy during the pre-treatment process for the seawater desalination. ## Claims ### Claim 1 A pre-treatment apparatus comprising: an underwater seawater pre-treatment assembly configured to obtain a pre-treated water by removing impurities from a seawater; a pre-treatment water tank, located on land, configured to accommodate the pre-treated water produced by the pre-treatment assembly; and a connection flow channel configured to connect the pre-treatment assembly and the pre-treatment water tank, wherein the pre-treatment assembly comprises: a plurality of water collection pipes which are supported by a support part, each water collection pipe having a plurality of openings formed on a side portion; a plurality of filtration filters spacedly arranged from each other in a longitudinal direction of each of the plurality of water collection pipes, each filtration filter surrounding a water collection pipe, among the plurality of water collection pipes, the filter being in the form of a hollow cylinder, wherein each filtration filter comprises meshes, a size of the meshes being configured such that the filter does not allow impurities contained in the seawater to pass through, but allows salt to pass through, and each filtration filter has a vertical side portion parallel to a vertical side portion of the water collection pipe, wherein the vertical side portion of the filtration filter directly contacts the seawater to be pre-treated; a water collection tank which is in fluid communication with the water collection pipe and configured to accommodate the pre-treated water that has passed through the filtration filter and the water collection pipe; a water conveying pump configured to suck the pre-treated water from an inner part of the water collection tank and transfer the pre-treated water collected within the water collection tank through a connection flow channel, and a strainer in the form of a ring which is inserted into the outside of the respective filtration filters; a connecting plate which connects a plurality of the strainers with each other; and a water pump which is installed into the connecting plate to raise or lower the entire connection plate by the driving force by jetting seawater, wherein impurities attached to the surface of the filtration filter can be removed by raising or lowering the strainer along the filtration filter, wherein one end of the water collection pipe is closed and the other end of the water collection pipe is in fluid communication with the water collection tank, and the seawater passes through the filtration filter by a difference in pressure between an inside and an outside of the filtration filter and then is collected by the water collection tank via the water collection pipe. ### Claim 2 (depends on 1) The pre-treatment apparatus of claim 1, further comprising a weight body which is connected to the water collection tank to prevent movement of the pre-treatment assembly on a sea floor. ### Claim 3 (depends on 2) The pre-treatment apparatus of claim 2, wherein the respective plurality of water collection pipes are spaced apart in a state of being erected in a longitudinal direction, the support part comprises an upper support part configured to support an upper end of the water collection pipe and a lower support part configured to support a lower end of the water collection pipe, and the lower support part is in fluid communication with the water collection tank. ### Claim 4 (depends on 3) The pre-treatment apparatus of claim 3, further comprising a plurality of connecting rings which are fitted to an external portion of the respective water collection pipe, adjacent filtration filters being connected to each other via the plurality of connecting rings in a state in which the plurality of filtration filters are inserted into the external portion of the water collection pipe.