The present invention relates to an energy recovery system in seawater desalination plant using a reverse osmosis membrane method for removing salt from seawater.
Energy recovery system, to be supplied to the reverse osmosis membrane cartridge pressurized high-pressure water and the raw water in the high pressure pump (5) (8), positive-displacement energy recovery apparatus concentrated water discharged from the reverse osmosis membrane cartridge (21) supplied by recovering pressure energy of concentrated water, to merge some of the raw water supplied to the positive-displacement energy recovery apparatus is pressurized, the pressurized water of the raw water to the high-pressure water pressurized by the high pressure pump. Energy recovery system utilizes a booster pump (44) for boosting the concentrated water discharged from the reverse osmosis membrane cartridge, the pressure difference between the high-pressure water discharged from the pressurized water and the high-pressure pump of the raw water by volume type energy recovery apparatus having the energy recovery turbine (14) for energy recovery by.