System for recovering energy during water preparation comprising osmosis extension stage assigned to reverse osmosis unit and connected to pressure exchange system via outlet line with pressure elevator

摘要

A system for recovering energy during water preparation comprises: (1) a reverse osmosis unit (2) to which high pressure water stream is fed and separated into pure water (permeate) and a concentrate, which is used to recover energy and (2) an osmosis extension stage (3) assigned to the reverse osmosis unit and connected to a pressure exchange system (4) via an outlet line (12) with a pressure elevator (13).