Apparatus for improving efficiency of a reverse osmosis system

A reverse osmosis water purification system comprising

• a source of water to be purified;
• a reverse running pump turbine (153) for providing energy recovery;
• a feed pump (101) being operatively connected to the turbine (153) to supply a source of high pressure water to be purified;
• a first purification membrane chamber (104) having an inlet operatively connected to the feed pump (101) for receiving a supply of high pressure unpurified water from the feed pump (101), the first purification membrane chamber (104) having an outlet for discharging water purified in the first purification membrane chamber (104), the first purification membrane chamber (104) having a discharge opening for discharging high pressure unpurified water from the first purification membrane chamber (104);
• a hydraulic turbocharger (108) having a turbine end T and a pump end P, the pump end P having an inlet for receiving the high pressure unpurified water from the first purification membrane chamber (104), and an outlet which discharges the high pressure unpurified water;
• a second purification membrane member chamber (112) having an inlet operatively connected to the outlet of the pump end P of the hydraulic turbocharger (108) for receiving the high pressure unpurified water from the pump end P of the turbocharger (108), the second purification membrane chamber (112) having an outlet for discharging water purified in the second purification membrane chamber (112), the second purification membrane chamber (112) having a discharge opening for discharging high pressure unpurified water from the second purification membrane chamber (112), the discharge opening being operatively connected to the turbine end T of the hydraulic turbocharger (108) and the turbine (153),
• whereby the high pressure unpurified water from the second purification membrane chamber (112) can be used to drive the turbine end T of the hydraulic turbocharger (108) and/or the turbine (153) to increase the pressure of the water to be purified that is supplied to the first (104) or the second (112) purification membrane chambers;
• wherein the turbine (153) is operatively connected in a series configuration with an impulse turbine inlet needle valve (122) and the feed pump (101).

A reverse osmosis water purification system comprising:

• a source of water to be purified;
• an impulse turbine (224) for providing energy recovery;
• a feed pump (201) operatively connected to the impulse turbine to supply a source of high pressure water to be purified;
• a hydraulic turbocharger (208) having a power recovery pump turbine T and a pump end P, the pump end P having an inlet for receiving a supply of unpurified water from the feed pump (201) and an outlet which discharges the high pressure unpurified water;
• a purification membrane chamber (212) having an inlet operatively connected to the pump end P of the hydraulic turbocharger (208) for receiving a supply of high pressure unpurified water, the purification membrane chamber (212) having an outlet for discharging water purified in the first membrane chamber (212), the purification membrane chamber (212) having a discharge opening for discharging high pressure unpurified water discharged from the purification membrane chamber (212), the discharge opening being operatively connected to the turbine end T of the hydraulic turbocharger (208) and the impulse turbine (224),
• whereby the high pressure unpurified water from the purification membrane chamber (212) can be used to drive the turbine end T of the hydraulic turbocharger (208) to increase the pressure of water to be purified that is supplied to the purification membrane chamber (212) and/or to drive the impulse turbine (224) to provide a portion of the energy needed to drive the feed pump (201).