Apparatus and method for the seawater pre-treatment for desalinating seawater into fresh water

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.