Energy recovery system

An energy recovery system for processing raw water, comprising:

• a high-pressure pump, whereby part of the raw water is supplied to the high-pressure pump, the high-pressure pump being configured to pressurize the part of the raw water to become high-pressure raw water that is discharged from the high-pressure pump;
• a reverse-osmosis membrane cartridge configured to process the high-pressure raw water discharged from the high-pressure pump by a reverse-osmosis membrane to produce processed water and concentrated water that are discharged from the reverse-osmosis membrane cartridge;
• an isobaric energy recovery device configured to recover pressure energy of the concentrated water discharged from the reverse-osmosis membrane cartridge, whereby another part of the raw water is supplied to the isobaric energy recovery device and is pressurized by the isobaric energy recovery device to become pressurized raw water, which is discharged from the isobaric energy recovery device and merges into the high-pressure raw water discharged by the high-pressure pump;
• a booster pump provided between the reverse-osmosis membrane cartridge and the isobaric energy recovery device and configured to boost a pressure of the concentrated water discharged from the reverse-osmosis membrane cartridge;
• and
• an energy recovery turbine configured to recover energy by using the pressure head difference between the pressurized raw water from the isobaric energy recovery device and the high-pressure raw water discharged from the high-pressure pump.