Showing papers on "Forward osmosis published in 1990"

Reverse osmosis water purification systems

Abstract: A reverse osmosis water purification system has a feed water line and outlets for reject and product water. Instead of wasting the reject water by allowing it to flow to a drain, the reject water is returned to the water feed line downstream of the reverse osmosis system so that is can be used for other purposes. A section of the water feed line has a flow restrictor which estabishes a dynamic pressure drop. Feed water for the reverse osmosis system is taken off the feed line upstream of the restrictor and reject water is returned downstream of the restrictor, thereby reducing the water wastage due to the reverse osmosis process.

Method and apparatus for treating salt-containing water

Abstract: PURPOSE: To reduce energy consumption and to carry out efficient treatment by passing salt-containing water through reverse osmosis membrane modules of two or more stages to separate the same into desalted water of a drinking water level and highly conc. water with a specific range of salt concn. CONSTITUTION: Salt-containing water is supplied to the high pressure reverse osmosis membrane module of the first stage and the water from said module 10 meets with the desalted water from the low pressure reverse osmosis membrane module 12 of the second stage to obtain desalted water of a drinking water level. Conc. water is supplied to the low pressure reverse osmosis membrane module 12 having the characteristics of low operation pressure and a low salt exclusion rate. The desalted water of the low pressure reverse osmosis membrane module 12 is returned to the supply part of the high pressure reverse osmosis membrane module 10 and allowed to meet with salt-containing water to be treated. By this method, since salt-containing water is treated to be capable of being separated into desalted water of a drinking water level and highly conc. water with salt concn. of 80,000-120,000ppm, energy consumption can be reduced. COPYRIGHT: (C)1992,JPO&Japio

Process for degassing purified water obtained by reverse osmosis and reverse osmosis system for carrying out said method

Abstract: To improve purified water quality and to increase the yield of a reverse osmosis system, in particular of a reverse osmosis system for production of purified water for medicinal purposes, said reverse osmosis system is provided on the purified water side with a degassing device (306) and on the raw water side with a heating device (210). The degassing device is provided with an underpressure pump (320) and an air separator (330). A heat exchanger (230) is provided upstream of the heating device (210), the secondary circuit (201) of which heat exchanger is connected to the return pipe (402) of the dialysis apparatus (not depicted) and to the retentate pipe (305) of the reverse osmosis system.