WO2009104214A1 - Reverse osmosis, water purification or desalinisation apparatus with energy recuperation and purified water dosage - Google Patents

Reverse osmosis, water purification or desalinisation apparatus with energy recuperation and purified water dosage Download PDF

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Publication number
WO2009104214A1
WO2009104214A1 PCT/IT2009/000012 IT2009000012W WO2009104214A1 WO 2009104214 A1 WO2009104214 A1 WO 2009104214A1 IT 2009000012 W IT2009000012 W IT 2009000012W WO 2009104214 A1 WO2009104214 A1 WO 2009104214A1
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WO
WIPO (PCT)
Prior art keywords
hydraulic
pump
motor
purification apparatus
hydraulic gear
Prior art date
Application number
PCT/IT2009/000012
Other languages
French (fr)
Other versions
WO2009104214A9 (en
Inventor
Diego Sodo
Luciano Longhi
Original Assignee
Iniziativa Centro Sud S.R.L.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Iniziativa Centro Sud S.R.L. filed Critical Iniziativa Centro Sud S.R.L.
Publication of WO2009104214A1 publication Critical patent/WO2009104214A1/en
Publication of WO2009104214A9 publication Critical patent/WO2009104214A9/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/131—Reverse-osmosis

Definitions

  • This invention relates to a reverse osmosis, water purification or desalinisation apparatus with energy recuperation and purified water dosage.
  • Background Art United States patent application US 2006/0065597 published on March 30, 2006 discloses a reverse osmosis water desalinisation system comprising a reverse osmosis cell, a hydraulic pump and a motor coupled to drive the pump, and a conduit array fluidly coupling the hydraulic pump to a source of water and fluidly coupling the hydraulic pump to the cell for pumping water from the source through the cell, and an energy recuperation assembly including a fixed positive-displacement hydraulic motor that is fluidly coupled to receive brine output from the cell, and an adjustable ratio increaser assembly that is mechanically coupled between the output of the hydraulic motor and an input of the hydraulic pump.
  • the dosage i.e. the purified water flow rate
  • the dosage is performed by different speeds of the pump and the hydraulic motor and independently of the displacements of both the hydraulic pump and the hydraulic motor.
  • the system construction is rather complex and does not make easy a component integration in order to achieve simple and compact configurations for the purification apparatus. Disclosure of invention
  • An object of the present invention is to overcome the complexity of the purification apparatus above described although said apparatus performs its functions of dosing a flow rate of the water amount passing through the cell membrane with respect to a total water flow rate, recuperating a water energy before the water being released in the external environment and delivering water without any interruption.
  • the present invention provides a reverse osmosis, water purification or desalinisation apparatus with energy recuperation and purified water dosage, comprising a positive-displacement rotary pump that is driven by a driving motor and generates a flow rate of salt water that is delivered to flow along at least an osmotic membrane and then toward a positive- displacement rotary hydraulic motor that is compelled by the water pressure to rotate in the same direction of the hydraulic pump, the hydraulic pump and the hydraulic motor having at least a shaft, apparatus wherein at least a shaft of the hydraulic pump and at least a shaft of the hydraulic motor are rigidly coupled to each other to rotate like an integral unit, the displacement of the pump being greater than the displacement of the hydraulic motor.
  • Rg. 1 is an exemplifying partially cross-sectioned perspective view of a first operating diagram of the present invention
  • Fig. 2 is an exemplifying partially cross-sectioned perspective view of a second operating diagram of the present invention
  • Fig. 3 is a cross-sectioned axonometric view of a first embodiment of the purification apparatus according to the present invention
  • Fig. 4 is a cross-sectioned axonometric view of a second embodiment of the purification apparatus according to the present invention.
  • FIG. 1 there is shown an exemplifying partially cross- sectioned perspective view of a first operating diagram of a purification and desalinisation apparatus according to the present invention.
  • an external gear pump is indicated as 2, which has toothed wheels 14 and 16 and a delivering chamber 18, and is driven by a driving motor 1 through its shaft 11.
  • the gear pump 2 sucks salt water from the environment 4 and makes it to flow along an osmotic membrane 7 through a conduit 6. Then the water flows in a conduit 9 that is connected to a hydraulic external gear motor 3 having toothed wheels 15, 17.
  • the toothed wheels 15, 17 are positioned in the same way with respect to the couple of toothed wheels of the hydraulic pump and to an entrance chamber 19, so that the toothed wheels 15, 17 are rotated in the same direction of those of the pump 2.
  • At the end brine exiting the hydraulic motor 3 is discharged to the environment 4 through a conduit 10.
  • Arrows are used in Fig. 1 to indicate the direction of gear rotation and of the water being treated.
  • the pump 2 has a displacement greater than the hydraulic motor 3.
  • the toothed wheel 14 of the pump 2 is rigidly connected to the toothed wheel 15 of the hydraulic motor 3 by means of a shaft 12.
  • the pump 2 outputs a flow rate equal to its displacement during each rotation thereof, and the hydraulic motor 3 is able to receive only a flow rate equal to its displacement that is lower than the pump 2.
  • the flow rate of water that is refused by the hydraulic motor 3 passes across the osmotic membrane 7.
  • the purified water reaches a collecting space 8 and at last the user 20.
  • the dosing function is performed: what passes across the membrane 7 is the flow rate differential between the pump 2 and the hydraulic motor 3.
  • the membrane 7 opposes the water passage with a loss of pressure equal to its osmotic pressure that affects all the circuit, i.e. from the delivering chamber 18 of the pump 2 to the conduits 6 and 9, to the entrance chamber 19 of the hydraulic motor 3.
  • the output that the driving motor 1 has to supply for driving the pump 2 depends on the pump flow rate at a determined pressure.
  • the input for the hydraulic motor 3 depends on the flow rate that it receives at the same pressure. Therefore the driving motor 1, whose speed is preferably adjustable, supplies a power that is a function of both the pressure and the difference between the flow rate delivered by the pump 2 and the flow rate received by the hydraulic motor 3, i.e. the output delivered by the driving motor 1 is proportional, besides to the pressure, only to the flow rate of the purified water. Thereby the energy recuperation is performed.
  • the toothed wheel 14 of the pump 2 and the toothed wheel 15 of the hydraulic motor 3 are equal and, although this is not a necessary condition, the teeth are aligned as if the two toothed wheels were made from one wheel in which the shaft 12 is formed.
  • the toothed wheels of the pump 2 and the hydraulic motor 3 differ in a thickness that determines the displacement difference between the pump 2 and the hydraulic motor 3.
  • the toothed wheels of the pump 2 are of a thickness greater than the toothed wheels of the hydraulic motor 3.
  • the shaft 13 serves to decrease the contact forces among the teeth.
  • the forces on the toothed wheels 16 and 17 due to the pressure in the delivering chamber 18 and the entrance chamber 19 are balanced as they are applied on one block, thereby the forces that the teeth mutually exercise decrease considerably.
  • the pump and the hydraulic motor in the purification apparatus according to the invention are received in one block, the toothed wheels 14 and 16 of the pump and those of the hydraulic motor (of which only the wheel 17 can be seen), being divided by a separation wall 20 one side of which pertains to the pump and the other side pertains to the hydraulic motor.
  • the driving motor 1 is an electrical motor. Such a motor can be directly powered.
  • the motor output can be also optimised to an allowable power both manually and automatically, with the assistance of known electronic means.
  • FIG. 4 A second construction is depicted in Fig. 4 in which an integration between a motor and pump assembly and the osmotic membrane is made.
  • a housing 22 containing the osmotic membrane 7 is of a cylindrical shape, where the whole motor and pump assembly as shown in Fig. 3 is housed.
  • Such an assembly is made integral with a sealing cover
  • the salt water after a previous priming, is sucked through the conduit 5 and fills a recipient 24. Next the salt water is sucked by the pump
  • the membrane 7 allows an amount of purified water to pass and be collected in the chamber 8 ready to be used.
  • the pressured water, flowing along the membrane 7 without passing through it, is then delivered to the hydraulic motor 3, which recovers power, and at last is discharged outside through the conduit 10.
  • the driving motor 1, that is a submersible electric motor, transmits its heat directly to the salt water that fills the recipient 24.
  • An entrance cable 21 of the driving motor 1 passes through the sealing cover

Abstract

A reverse osmosis purification apparatus comprises a hydraulic gear pump (2) that is driven by a driving motor (1) and generates a flow rate of salt water that is delivered to flow along at least an osmotic membrane (7) and then toward a hydraulic gear motor (3). The hydraulic pump (2) and the hydraulic motor (3) are coupled to each other by a shaft (12), and the displacement of the hydraulic pump (2) is greater than the displacement of the hydraulic motor (3).

Description

Reverse osmosis, water purification or desalinisation apparatus with energy recuperation and purified water dosage
DESCRIPTION Technical Field
This invention relates to a reverse osmosis, water purification or desalinisation apparatus with energy recuperation and purified water dosage. Background Art United States patent application US 2006/0065597 published on March 30, 2006 discloses a reverse osmosis water desalinisation system comprising a reverse osmosis cell, a hydraulic pump and a motor coupled to drive the pump, and a conduit array fluidly coupling the hydraulic pump to a source of water and fluidly coupling the hydraulic pump to the cell for pumping water from the source through the cell, and an energy recuperation assembly including a fixed positive-displacement hydraulic motor that is fluidly coupled to receive brine output from the cell, and an adjustable ratio increaser assembly that is mechanically coupled between the output of the hydraulic motor and an input of the hydraulic pump. In the above mentioned patent application the dosage, i.e. the purified water flow rate, is performed by different speeds of the pump and the hydraulic motor and independently of the displacements of both the hydraulic pump and the hydraulic motor. The system construction is rather complex and does not make easy a component integration in order to achieve simple and compact configurations for the purification apparatus. Disclosure of invention
An object of the present invention is to overcome the complexity of the purification apparatus above described although said apparatus performs its functions of dosing a flow rate of the water amount passing through the cell membrane with respect to a total water flow rate, recuperating a water energy before the water being released in the external environment and delivering water without any interruption.
Therefore, the present invention provides a reverse osmosis, water purification or desalinisation apparatus with energy recuperation and purified water dosage, comprising a positive-displacement rotary pump that is driven by a driving motor and generates a flow rate of salt water that is delivered to flow along at least an osmotic membrane and then toward a positive- displacement rotary hydraulic motor that is compelled by the water pressure to rotate in the same direction of the hydraulic pump, the hydraulic pump and the hydraulic motor having at least a shaft, apparatus wherein at least a shaft of the hydraulic pump and at least a shaft of the hydraulic motor are rigidly coupled to each other to rotate like an integral unit, the displacement of the pump being greater than the displacement of the hydraulic motor. Brief description of drawings Features and advantages of the invention will be better understood by the following description taken in connection with the enclosed drawings, in which:
Rg. 1 is an exemplifying partially cross-sectioned perspective view of a first operating diagram of the present invention; Fig. 2 is an exemplifying partially cross-sectioned perspective view of a second operating diagram of the present invention;
Fig. 3 is a cross-sectioned axonometric view of a first embodiment of the purification apparatus according to the present invention; and Fig. 4 is a cross-sectioned axonometric view of a second embodiment of the purification apparatus according to the present invention. Preferred embodiments of the invention
With reference to Fig. 1, there is shown an exemplifying partially cross- sectioned perspective view of a first operating diagram of a purification and desalinisation apparatus according to the present invention. Therein an external gear pump is indicated as 2, which has toothed wheels 14 and 16 and a delivering chamber 18, and is driven by a driving motor 1 through its shaft 11. The gear pump 2 sucks salt water from the environment 4 and makes it to flow along an osmotic membrane 7 through a conduit 6. Then the water flows in a conduit 9 that is connected to a hydraulic external gear motor 3 having toothed wheels 15, 17. The toothed wheels 15, 17 are positioned in the same way with respect to the couple of toothed wheels of the hydraulic pump and to an entrance chamber 19, so that the toothed wheels 15, 17 are rotated in the same direction of those of the pump 2. At the end brine exiting the hydraulic motor 3 is discharged to the environment 4 through a conduit 10. Arrows are used in Fig. 1 to indicate the direction of gear rotation and of the water being treated. The pump 2 has a displacement greater than the hydraulic motor 3. The toothed wheel 14 of the pump 2 is rigidly connected to the toothed wheel 15 of the hydraulic motor 3 by means of a shaft 12. In this way, the pump 2 outputs a flow rate equal to its displacement during each rotation thereof, and the hydraulic motor 3 is able to receive only a flow rate equal to its displacement that is lower than the pump 2. The flow rate of water that is refused by the hydraulic motor 3 passes across the osmotic membrane 7. Then the purified water reaches a collecting space 8 and at last the user 20. Thereby the dosing function is performed: what passes across the membrane 7 is the flow rate differential between the pump 2 and the hydraulic motor 3. The membrane 7 opposes the water passage with a loss of pressure equal to its osmotic pressure that affects all the circuit, i.e. from the delivering chamber 18 of the pump 2 to the conduits 6 and 9, to the entrance chamber 19 of the hydraulic motor 3. The output that the driving motor 1 has to supply for driving the pump 2 depends on the pump flow rate at a determined pressure. The input for the hydraulic motor 3 depends on the flow rate that it receives at the same pressure. Therefore the driving motor 1, whose speed is preferably adjustable, supplies a power that is a function of both the pressure and the difference between the flow rate delivered by the pump 2 and the flow rate received by the hydraulic motor 3, i.e. the output delivered by the driving motor 1 is proportional, besides to the pressure, only to the flow rate of the purified water. Thereby the energy recuperation is performed.
In a preferred embodiment shown in Hg. 2 where equal or similar components are designated with the same reference numerals, the toothed wheel 14 of the pump 2 and the toothed wheel 15 of the hydraulic motor 3 are equal and, although this is not a necessary condition, the teeth are aligned as if the two toothed wheels were made from one wheel in which the shaft 12 is formed.
The same thing is valid also for the toothed wheels 16 and 17. Further, according to the preferred embodiment, the wheels engaging each other are equal, but it is not a necessary condition.
These features permit all the toothed wheels to freely rotate also when the toothed wheels 16 and 17 are made integral through a shaft 13. The toothed wheels of the pump 2 and the hydraulic motor 3 differ in a thickness that determines the displacement difference between the pump 2 and the hydraulic motor 3. In particular, the toothed wheels of the pump 2 are of a thickness greater than the toothed wheels of the hydraulic motor 3. Differently from the first operation diagram shown in Fig. 1, where the teeth of the toothed wheel 16 are pushed by the water pressure with a force that is dependent on the surface on which the pressure is applied, against the teeth of the toothed wheel 14 and, in the same way, the teeth of the toothed wheel 17 against those of the toothed wheel 15, in the second operation diagram shown in Fig. 2 the shaft 13 serves to decrease the contact forces among the teeth. In fact, in the second operation diagram, the forces on the toothed wheels 16 and 17 due to the pressure in the delivering chamber 18 and the entrance chamber 19 are balanced as they are applied on one block, thereby the forces that the teeth mutually exercise decrease considerably. In an axonometric view of a first construction shown in Fig. 3, the pump and the hydraulic motor in the purification apparatus according to the invention are received in one block, the toothed wheels 14 and 16 of the pump and those of the hydraulic motor (of which only the wheel 17 can be seen), being divided by a separation wall 20 one side of which pertains to the pump and the other side pertains to the hydraulic motor.
The construction as shown in Fig. 3 has advantages for its size, and is most sealed against internal leakage. Further, according to this embodiment the driving motor 1 is an electrical motor. Such a motor can be directly powered. The motor output can be also optimised to an allowable power both manually and automatically, with the assistance of known electronic means.
A second construction is depicted in Fig. 4 in which an integration between a motor and pump assembly and the osmotic membrane is made. According to this second construction, a housing 22 containing the osmotic membrane 7 is of a cylindrical shape, where the whole motor and pump assembly as shown in Fig. 3 is housed. Such an assembly is made integral with a sealing cover
23 acting also as a manifold by conduits formed inside it and seals the housing so that a continuity in the hydraulic circuit as made by the apparatus is assured.
In particular the salt water, after a previous priming, is sucked through the conduit 5 and fills a recipient 24. Next the salt water is sucked by the pump
2 through a conduit 25. The pressured water flows along the membrane 7. The membrane 7 allows an amount of purified water to pass and be collected in the chamber 8 ready to be used.
The pressured water, flowing along the membrane 7 without passing through it, is then delivered to the hydraulic motor 3, which recovers power, and at last is discharged outside through the conduit 10. The driving motor 1, that is a submersible electric motor, transmits its heat directly to the salt water that fills the recipient 24.
An entrance cable 21 of the driving motor 1 passes through the sealing cover
23.
It should be clear that in the above description fittings such as check valves, bleeding valves and safety valves have been omitted. These fittings whose importance for a satisfying operation of the apparatus is known by the skilled in the art must be considered as necessary additions with which the invention does not depart from the scope of the enclosed claims.

Claims

1. A reverse osmosis, water purification or desalinisation apparatus with energy recuperation and purified water dosage, comprising a positive- displacement rotary pump that is driven by a driving motor (1) and generates a flow rate of salt water that is delivered to flow along at least an osmotic membrane (7) and then toward a positive-displacement rotary hydraulic motor that is compelled by the water pressure to rotate in the same direction of the hydraulic pump, the hydraulic pump and the hydraulic motor having at least an own shaft, characterised in that at least a shaft of the hydraulic pump and at least a shaft of the hydraulic motor are rigidly coupled to each other to rotate like an integral unit, the displacement of the pump being greater than the displacement of the hydraulic motor.
2. The purification apparatus according to claim 1 characterised in that both the positive-displacement rotary hydraulic pump and the positive- displacement rotary hydraulic motor are of a type provided with external gears, the hydraulic gear pump having a couple of hydraulic pump toothed wheels (14, 16) and the hydraulic gear motor having a couple of hydraulic motor toothed wheels (15, 17) that are positioned in the same way with respect to the couple of hydraulic pump toothed wheels.
3. The purification apparatus according to claim 2 characterised in that a first toothed wheel (14) of the hydraulic gear pump (2) is connected on one side to the driving motor (1) and on the other side to a first toothed wheel (15) of the hydraulic gear motor (3) by means of a shaft (12) so that the toothed wheels (14, 15) being connected to each other rotate like an integral unit.
4. The purification apparatus according to claim 3 characterised in that the toothed wheel (14) of the hydraulic gear pump (2) has a toothing equal to the toothed wheel (15) of the hydraulic gear motor (3).
5. The purification apparatus according to claim 2 characterised in that the second toothed wheel (16) of the hydraulic gear pump (2) has a toothing equal to the second toothed wheel (17) of the hydraulic gear motor (3).
6. The purification apparatus according to claim 2 characterised in that the toothed wheel (16) of the hydraulic gear pump (2) is connected by means of a shaft (13) to the toothed wheel (17) of the hydraulic gear motor (3) so that the toothed wheels (16, 17) are integral to each other.
7. The purification apparatus according to claim 2 characterised in that a thickness of the toothed wheels (14, 16) of the hydraulic gear pump (2) is greater than the thickness of the toothed wheels (15, 17) of the hydraulic gear motor (3).
8. The purification apparatus according to claim 2 characterised in that the hydraulic gear pump (2) and the hydraulic gear motor (3) are joined in an assembly, the toothed wheels (14, 16) of the hydraulic gear pump (2) and the toothed wheels (15, 17) of the hydraulic gear motor (3) being divided by a separation wall (20) one side of which pertains to the hydraulic pump (2) and the other side pertains to the hydraulic motor (3).
9. The purification apparatus according to claim 1 characterised in that the driving motor (1) is a power adjustable electric motor.
10. The purification apparatus according to claim 1 characterised in that the osmotic membrane (7) is contained in a cylindrical housing (22), and the positive-displacement rotary pump, the driving motor (1) thereof, and the positive-displacement rotary hydraulic motor form an assembly being sustained by a housing sealing cover (23), comprising conduits that are formed inside the housing sealing cover (23) for hydraulic connections that are made so that the hydraulic pump sucks the salt water from outside through a conduit (5) to a recipient (24) and through a conduit (25) to flow along the osmotic membrane (7) that allows an amount of purified water to pass, and brine is delivered to the hydraulic motor which recovers power, and at last it is discharged outside through a conduit (10).
PCT/IT2009/000012 2008-02-18 2009-01-15 Reverse osmosis, water purification or desalinisation apparatus with energy recuperation and purified water dosage WO2009104214A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000086A ITRM20080086A1 (en) 2008-02-18 2008-02-18 PURIFICATION OR DESALINIZING GROUP WITH REVERSE OSMOSIS WITH ENERGY RECOVERY AND DEFACED WATER DOSAGE
ITRM2008A000086 2008-02-18

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WO2009104214A1 true WO2009104214A1 (en) 2009-08-27
WO2009104214A9 WO2009104214A9 (en) 2010-07-15

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102671543A (en) * 2012-06-01 2012-09-19 浙江沁园水处理科技有限公司 Reverse-osmosis flow timing automatic mechanical flushing valve device
WO2016022954A1 (en) * 2014-08-08 2016-02-11 Porifera, Inc. Systems and methods for offshore desalination and/or oil recovery
US11541352B2 (en) 2016-12-23 2023-01-03 Porifera, Inc. Removing components of alcoholic solutions via forward osmosis and related systems
US11571660B2 (en) 2015-06-24 2023-02-07 Porifera, Inc. Methods of dewatering of alcoholic solutions via forward osmosis and related systems
US11759751B2 (en) 2012-12-21 2023-09-19 Porifera, Inc. Separation systems, elements, and methods for separation utilizing stacked membranes and spacers

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EP0190741A1 (en) * 1985-02-06 1986-08-13 Ebara Corporation Pump-water wheel system
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US20040178145A1 (en) * 1999-05-25 2004-09-16 Miox Corporation Dual head pump driven filtration system
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102671543A (en) * 2012-06-01 2012-09-19 浙江沁园水处理科技有限公司 Reverse-osmosis flow timing automatic mechanical flushing valve device
US11759751B2 (en) 2012-12-21 2023-09-19 Porifera, Inc. Separation systems, elements, and methods for separation utilizing stacked membranes and spacers
WO2016022954A1 (en) * 2014-08-08 2016-02-11 Porifera, Inc. Systems and methods for offshore desalination and/or oil recovery
US11571660B2 (en) 2015-06-24 2023-02-07 Porifera, Inc. Methods of dewatering of alcoholic solutions via forward osmosis and related systems
US11541352B2 (en) 2016-12-23 2023-01-03 Porifera, Inc. Removing components of alcoholic solutions via forward osmosis and related systems

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