Liquid purification or separation – Flow – fluid pressure or material level – responsive – Maintaining stream pressure or flow
Reexamination Certificate
2001-02-01
2002-12-10
Drodge, Joseph W. (Department: 1723)
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Maintaining stream pressure or flow
C210S321650, C210S321660, C210S416100, C417S225000, C417S313000, C417S393000, C417S404000
Reexamination Certificate
active
06491813
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to equipment for desalination of water by reverse osmosis which allows energy recovery through various solutions and related variants.
BACKGROUND OF THE INVENTION
It is known that the filtration of a liquid by reverse osmosis requires the use of high pressures and that the conventional equipment used therefore, producing high pressures by means of a high pressure pump and a throttle valve, has low energy efficiency.
OBJECT OF THE INVENTION
The main object of the present invention is to provide equipment for desalination of water by reverse osmosis whereby an energy saving is achieved.
SUMMARY OF THE INVENTION
In a first solution, the high pressure needed for the reverse osmosis process is achieved through a device able to hydraulically amplify the pressure provided by low pressure pumps.
Therefore, this equipment doesn't need the high pressure pumps of a conventional reverse osmosis system, but can make use of low pressure pumps, suitably connected to a pressure amplifier (described hereinbelow) as well as to the reverse osmosis membranes.
The energy saving is thus achieved through the considerable reduction of the system feeding pressure, which is amplified by a passive amplifying device.
In a second solution, the high pressure needed for the reverse osmosis pressure is achieved through a conventional high pressure pump.
However, the flow rate of this pump is not equal to the total flow rate of the water to be treated, as in the conventional systems, but is only equal to the flow rate of fresh water produced by the system.
This is achieved through a hydraulic device (described hereinbelow) which forms a closed circuit between the inlet and the outlet of the reverse osmosis membrane, allowing a fresh water production equal to the flow rate provided by the high pressure pump.
The energy saving is thus achieved through the considerable reduction of the flow rate of the high pressure pump for feeding the system.
The present invention also involves various switching systems or the cycle reversal valve as well as arrangements for further increasing the working flexibility of the system.
REFERENCES:
patent: 3825122 (1974-07-01), Taylor
patent: 4367140 (1983-01-01), Wilson
patent: 4592768 (1986-06-01), Cutler et al.
patent: 5462414 (1995-10-01), Permar
patent: 5628198 (1997-05-01), Permar
patent: 6017200 (2000-01-01), Childs et al.
patent: 6203696 (2001-03-01), Pearson
Dubno Herbert
Schenker Italia S.R.L.
LandOfFree
Equipment for desalination of water by reverse osmosis with... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Equipment for desalination of water by reverse osmosis with..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Equipment for desalination of water by reverse osmosis with... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2997708