CN102442715B - Pressure delay osmosis/reverse osmosis combined desalination method - Google Patents
Pressure delay osmosis/reverse osmosis combined desalination method Download PDFInfo
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- CN102442715B CN102442715B CN2011103460592A CN201110346059A CN102442715B CN 102442715 B CN102442715 B CN 102442715B CN 2011103460592 A CN2011103460592 A CN 2011103460592A CN 201110346059 A CN201110346059 A CN 201110346059A CN 102442715 B CN102442715 B CN 102442715B
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- 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
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- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Abstract
The invention discloses a pressure delay osmosis/reverse osmosis combined desalination method, which comprises the following steps of: pressurizing pretreated sewage flow U, successively inputting into first and second pressure delay osmosis devices; pressurizing pretreated seawater flow A, entering into the first pressure delay osmosis device, outputting three flows D, E and F, inputting the flow D into a first energy recovery device for energy absorption, inputting into a first booster pump for supercharging, inputting the flow E into a second booster pump for supercharging, inputting the flow F into a second energy recovery device for energy absorption, inputting into a third booster pump for supercharging, merging the three flows, inputting into a high-pressure membrane module, outputting a strong brine flow P from the membrane module, inputting the flow P into the second energy recovery device to release energy, inputting into a fourth booster pump for supercharging, inputting into the second pressure delay osmosis device, inputting into the first energy recovery device to release energy, outputting product water out from the membrane module, and processing the product water for usage. The method provided by the invention is used to raise energy utilization rate, decrease energy consumption, save desalination cost and reduce discharge load of the strong brine.
Description
Technical field
The invention belongs to the desalination field, relate to particularly a kind of pressure delay osmosis/reverse osmosis combined desalination method.
Background technology
Growing water demand, gradually the climate arid of normality and the critical shortage that the water surrounding that continues to worsen has caused Freshwater resources are developed unconventional water source, just are placed on critical role by countries in the world and study and be put to practice.Along with developing rapidly of China's economic society, the utilization at unconventional water source has been subject to the extensive concern of various circles of society.For coastal cities and Island, the development and use at unconventional water source mainly comprise sea water desaltination, reusing sewage and rainwater utilization three aspects:.Because climate ANOMALOUS VARIATIONS has in various degree all appearred in a lot of areas, the world in recent years, causes local quantity of precipitation significantly to descend, rainwater utilization is restricted, and thus, sea water desaltination and reusing sewage become the most feasible, also are the most reliable sustainable water increment methods.
The area of earth surface 70.8% is awash, and wherein 97.5% water resources is the seawater that can't directly drink, and therefore obtaining Freshwater resources by the method that desalinizes seawater is a kind of strategic choices.At present, sea water desaltination worldwide is applied widely, and large quantities of Seawater Desalination Projects have all been built in a lot of maritime nations and area in succession.Recent statistics according to international desalination association (IDA): whole world desalination installed capacity in the past in 5 years with every year on average 12% speed increment, whole world desalination in the end of the year 2010 is produced the water scale and has been reached 65 * 10
6m
3/ d analyzes based on various countries' official statistics and water supply/demand, produces water to whole world desalination in 2015 and will reach 98 * 10
6m
3/ d.
Method for desalting seawater has a variety of, business-likely now mainly contains following three kinds of desalination technologies: reverse osmosis, multi-effect distilling and multistage flash evaporation.Although sea water desaltination has different technique available, but sea water desaltination is a kind of " energy intensive commercial run " in essence, the desalination process need consumes mass energy, and the Seawater Desalination Project that has moved is confined to the area that the energy is relatively cheap or reserves are more abundant more.Therefore, in order to promote the Sustainable development of sea water desaltination, need to find out the solution of further reduction sea water desaltination energy consumption and cost.In addition, desalting process can produce a large amount of strong brines, the direct discharge into sea of strong brine not only can be caused disadvantageous effect to ocean environment, also can cause the waste of resource, how weaken or eliminate strong brine to the impact of environment and it is rationally utilized also is one of direction of paying close attention to from now on of sea water desaltination in addition.
Reusing sewage refers to the treated facility deep purifying of municipal effluent and processes, and reaches the process of recycling after the specific water water quality standard.Reusing sewage divides to be drunk the reuse of type water and non-ly drinks two kinds of type water reuses.Non-ly drink the reuse of type water and be widely accepted at present, drink the reuse of type water also in the approval that progressively obtains the public, and can be more widely used in foreseeable future.
In the membrane separation technique field, reverse osmosis, just permeate and pressure retarded osmosis all is based on the membrane process that semi-permeable membranes is selected the perviousness principle.Water molecules sees through the high side of film water partial potential from selectivity and is diffused into the low side of water chemistry gesture in the positive process of osmosis; Reverse osmosis process, utilizes selectivity to see through film solvent is separated with other component in the solution as impellent with the pressure that is higher than osmotic pressure; It is the pilot process that is just permeating with reverse osmosis that pressure delays to permeate, Water Pressure is in the opposite direction of osmotic pressure gradient, because there is the salt concn gradient in the film both sides, the net flux of water remains to the concentrated solution direction, can permeate the considerable energy that current carry by turbine power generation or other approach utilization.
Both at home and abroad to being started in the sixties in last century, because reverse osmosis technology has without phase transformation, modularization, flow process is simple, easy to operate, floor space is little, reduced investment, low power consumption and other advantages, develop very rapid the research of reverse osmosis.At present, reverse osmosis desalination technology has been obtained a large amount of engineerings application.Yet still there are many obstacles in the continuation progress of reverse osmosis desalination technology, and the reverse osmosis system energy consumption is still waiting to reduce, and the system water rate of recovery also has much room for improvement, and this is that it makes the major cause that the water cost remains high for a long time.
Research to pressure retarded osmosis in the world wide is started in the seventies in last century, the main research application direction of pressure retarded osmosis is the infiltration generating, in the pressure retarded osmosis process, fresh water is along a side flow of film, pressurization one side that is penetrated into film under the effect of osmotic pressure is mixed with salt water, the salt water that is diluted is divided into two fluid streams, and a part produces electric energy by driving turbine, and another part is by the salt water pressurization of pressure exchanger for flowing into.
Summary of the invention
The objective of the invention is to propose a kind of pressure delay osmosis/reverse osmosis combined desalination method.
Technical scheme of the present invention is summarized as follows:
A kind of pressure delay osmosis/reverse osmosis combined desalination method comprises the steps:
To after 14 pressurizations of sewage working shaft, be divided into W, two strands of current of X through sewage pretreater 13 pretreated sewage current U; After current W inputted the first pressure retarded osmosis device 3 and carries out process operation, concentrated solution was discharged system as current Y; After current X inputted the second pressure retarded osmosis device 11 and carries out process operation, concentrated solution was discharged system as current Z; Add through seawater working shaft 2 through sea water preprocessing device 1 pretreated seawater current A and to be pressed into current B, carry out process operation through described the first pressure retarded osmosis device 3 again after, output D, E, three strands of current of F; Current D inputs first the first energy recycle device 4 and absorbs energy, inputs 5 superchargings of the first topping-up pump again and becomes High-Pressure Water H; Current E inputs 6 superchargings of the second topping-up pump and becomes High-Pressure Water J; Current F inputs first the second energy recycle device 7 and absorbs energy, inputs 8 superchargings of the 3rd topping-up pump again and becomes High-Pressure Water L; Input high-pressure membrane assembly 9 carried out membrane sepn after three strands of current of H, J and L merged into current M; The high-pressure thick brine stream P of described high-pressure membrane assembly 9 outputs inputs described the second energy recycle device 7 and releases energy, and inputs 10 superchargings of the 4th topping-up pump again and becomes current R; After described current R inputs described the second pressure retarded osmosis device 11 and carries out process operation, input described the first energy recycle device 4 again and release energy, lean liquor is discharged system as current T; The product current N of described high-pressure membrane assembly output after preprocessor 12 is processed for.
Described high-pressure membrane assembly is reverse osmosis membrane assembly or nanofiltration membrane component.
Advantage of the present invention:
The present invention has considered the water rate of recovery, energy consumption, cost, water quality, environmental influence and working service etc. and has used key element, by two pressure retarded osmosis devices, utilize on the one hand the first pressure retarded osmosis device to purify, reclaim sewage, seawater is diluted, and this newly-increased water yield carried out supercharging, improved impervious desalination system the water rate of recovery, reduced system energy consumption, ensured desalination water water quality; Flow R and freshet X with reverse osmosis concentrated salt solution and sewage as salt water respectively on the other hand, utilize the osmotic energy of the second pressure retarded osmosis device, and by the first energy recycle device direct weighting reverse osmosis feedwater, improved energy utilization efficiency, reduced system energy consumption, saved desalinating cost, cut down the strong brine discharge load.In addition, the desalting method that the present invention relates to also has the advantages such as modularization, easily amplification, flexible operation and floor space are little.
Description of drawings
Fig. 1 is a kind of pressure delay osmosis/reverse osmosis combined desalination method schematic diagram of the present invention.
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing.
A kind of pressure delay osmosis/reverse osmosis combined desalination method comprises the steps:
To after 14 pressurizations of sewage working shaft, be divided into W, two strands of current of X through the sewage current U that the pollutents such as suspended substance, microorganism and colloidal solid are wherein removed in 13 pre-treatment of sewage pretreater; After current W inputs the first pressure retarded osmosis device 3 and carries out process operation, sewage dependence osmosis enters the seawater side through forward osmosis membrane seawater is diluted, and utilize the osmotic pressure between seawater and sewage to finish seeing through the pressurization of liquid, sewage concentration liquid is discharged system as current Y, and this step can reduce the saltiness of reverse osmosis feedwater and system to water consumption; After current X inputs the second pressure retarded osmosis device 11 and carries out process operation, sewage relies on osmosis to see through forward osmosis membrane and enters the strong brine side, and utilize the osmotic pressure between strong brine and sewage to finish seeing through the pressurization of liquid, sewage concentration liquid is discharged system as current Z, and this step can make the second pressure retarded osmosis device 11 salt water exit end discharge the current that carry large energy; To add through seawater working shaft 2 through the seawater current A of the sea water preprocessing device 1 pre-treatment removal impurity such as suspended substance, algae and organism wherein and be pressed into current B, after carrying out process operation through the first pressure retarded osmosis device 3 again, output D, E, three strands of current of F; Current D inputs first the first energy recycle device 4 and absorbs energy and finish preliminary supercharging, inputs the first topping-up pump 5 again and carries out secondary booster and become High-Pressure Water H to reach the requirement of high-pressure membrane assembly intake pressure; Current E inputs 6 superchargings of the second topping-up pump and becomes High-Pressure Water J to reach the requirement of high-pressure membrane assembly intake pressure; Current F inputs first the second energy recycle device 7 and absorbs energy and finish preliminary supercharging, inputs the 3rd topping-up pump 8 again and carries out secondary booster and become High-Pressure Water L to reach the requirement of high-pressure membrane assembly intake pressure; Input high-pressure membrane assembly 9 carried out membrane sepn after three strands of current of H, J and L merged into current M; The high-pressure thick brine stream P of high-pressure membrane assembly 9 outputs inputs the second energy recycle device 7 as high-pressure thick water and releases energy transmission ofenergy feedwater flow F, and the low-press thick salt solution that the second energy recycle device 7 is discharged becomes current R through 10 superchargings of the 4th topping-up pump; Current R inputs first the second pressure retarded osmosis device 11 and carries out process operation, inputs the first energy recycle device 4 again and releases energy transmission ofenergy feedwater flow D, and lean liquor is discharged system as current T; The product current N of high-pressure membrane assembly output after preprocessor 12 aftertreatments for.
The high-pressure membrane assembly is reverse osmosis membrane assembly or nanofiltration membrane component.
One aspect of the present invention is utilized the pressure retarded osmosis device to purify, is reclaimed sewage, seawater is diluted, and this newly-increased water yield is carried out supercharging; On the other hand respectively with reverse osmosis concentrated salt solution and sewage as salt water source and freshwater source, utilize the osmotic energy of pressure retarded osmosis process, and by energy recycle device direct weighting reverse osmosis feedwater, thereby the rate of recovery and the energy utilization efficiency of impervious desalination system have been improved, reduced system energy consumption, saved desalinating cost, cut down the strong brine discharge load, ensured desalination water water quality.
Claims (1)
1. a pressure delay osmosis/reverse osmosis combined desalination method is characterized in that comprising the steps:
To after sewage working shaft (14) pressurization, be divided into W, two strands of current of X through the pretreated sewage current of sewage pretreater (13) U; After current W inputted the first pressure retarded osmosis device (3) and carries out process operation, concentrated solution was discharged system as current Y; After current X inputted the second pressure retarded osmosis device (11) and carries out process operation, concentrated solution was discharged system as current Z; Add through seawater working shaft (2) through sea water preprocessing device (1) pretreated seawater current A and to be pressed into current B, after passing through again described the first pressure retarded osmosis device (3) and carrying out process operation, output D, E, three strands of current of F; Current D inputs first the first energy recycle device (4) and absorbs energy, inputs the first topping-up pump (5) supercharging again and becomes High-Pressure Water H; Current E inputs the second topping-up pump (6) supercharging and becomes High-Pressure Water J; Current F inputs first the second energy recycle device (7) and absorbs energy, inputs the 3rd topping-up pump (8) supercharging again and becomes High-Pressure Water L; Three strands of current of H, J and L merge into to be inputted reverse osmosis membrane assembly (9) behind the current M and carries out membrane sepn; The high-pressure thick brine stream P of described reverse osmosis membrane assembly (9) output inputs described the second energy recycle device (7) and releases energy, and inputs the 4th topping-up pump (10) supercharging again and becomes current R; After described current R inputs described the second pressure retarded osmosis device (11) and carries out process operation, input described the first energy recycle device (4) again and release energy, lean liquor is discharged system as current T; The product current N of described reverse osmosis membrane assembly output after preprocessor (12) is processed for.
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| KR101489855B1 (en) * | 2013-02-22 | 2015-02-06 | 지에스건설 주식회사 | Desalination system capable of recovering osmotic energy and method thereof |
| RU2614287C2 (en) * | 2015-09-02 | 2017-03-24 | Закрытое Акционерное Общество "Аквафор Продакшн" (Зао "Аквафор Продакшн") | Fluid cleaning system |
| CN113600014A (en) * | 2016-06-06 | 2021-11-05 | 巴特尔纪念研究所 | Purification system |
| CN106082397B (en) * | 2016-06-12 | 2021-04-20 | 东华大学 | System and method for synchronous sewage regeneration and seawater desalination |
| CN106379961A (en) * | 2016-10-26 | 2017-02-08 | 陈志强 | Multi-section reverse-osmosis seawater desalination and saline water potential difference energy power generation coupling system |
| CN109095561A (en) * | 2017-06-21 | 2018-12-28 | 北京天诚同创电气有限公司 | Reverse osmosis seawater desalting method and system |
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| NO20016012L (en) * | 2001-12-07 | 2003-06-10 | Statkraft Sf | Hydrophilic semipermeable membrane |
| CN2677366Y (en) * | 2003-12-12 | 2005-02-09 | 国家海洋局天津海水淡化与综合利用研究所 | Medium and small size integrated reverse asmosis sea water desalination device |
| JP2009510301A (en) * | 2005-09-20 | 2009-03-12 | アクアポリン エーピーエス | Biomimetic aqueous membrane with aquaporins used in the generation of salinity differential power |
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