CN106830451A - The deionization integral treatment method and device of a kind of desalination water - Google Patents

The deionization integral treatment method and device of a kind of desalination water Download PDF

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Publication number
CN106830451A
CN106830451A CN201710096428.4A CN201710096428A CN106830451A CN 106830451 A CN106830451 A CN 106830451A CN 201710096428 A CN201710096428 A CN 201710096428A CN 106830451 A CN106830451 A CN 106830451A
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CN
China
Prior art keywords
water
module
deionization
desalination
capacitive deionization
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Pending
Application number
CN201710096428.4A
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Chinese (zh)
Inventor
陈琳
胡勤政
王成燚
朱亮
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Hohai University HHU
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Hohai University HHU
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Priority to CN201710096428.4A priority Critical patent/CN106830451A/en
Publication of CN106830451A publication Critical patent/CN106830451A/en
Pending legal-status Critical Current

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    • 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
    • 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
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
    • C02F1/4691—Capacitive deionisation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/08—Seawater, e.g. for desalination
    • 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

Abstract

The invention discloses a kind of deionization integral treatment method of desalination water, comprise the following steps：Raw water is sequentially passed through into some film filter modules, single filter water is obtained；Above-mentioned single filter water is sequentially passed through into some capacitive deionization modules, cascade filtration water is obtained；Above-mentioned cascade filtration water is obtained water purification through low pressure reverse osmosis module.Water treatment facilities based on the above method, by water pump, after some film filter modules, some capacitive deionization modules and low pressure reverse osmosis resume module that raw water is concatenated successively, is obtained water purification.The present invention combines micro-filtration, ultrafiltration, Multistage Membranes capacitive deionization and low pressure reverse osmosis, suspension, organic matter and the salinity gone respectively in water removal, both overcome the high energy consumption of conventional reverse osmosis technology, the problems such as membrane fouling rate is fast, also improve the treatment effect of saline-water reclamation, its simple structure, easy to operate, equipment maintenance cost are low, with very strong practicality and wide applicability.

Description

The deionization integral treatment method and device of a kind of desalination water
Technical field
The present invention relates to a kind of seawater (salt water) desalination technology, and in particular to the deionization integral treatment method and dress of a kind of desalination water Put.
Background technology
With developing rapidly for China's economy, population is on the increase, and environmental problem increasingly serious, freshwater resources Shortage turned into the short slab for limiting China socio-economic development.In more than 660 city of current China, the city for having nearly 400 lacks Water, wherein 108 is serious water shortage.The protection and purification of water resource as can be seen here, the protection and improvement of water pollution is extremely urgent.
At present, countries in the world solve local shortage of water resources method mainly has long-range water transfer, underground water intake and builds reservoir Deng.The project of South-to-North water diversion of China is exactly the model of long-range water transfer.But using without restraint for these methods, causes ecological broken The series of malpractice such as bad, land subsidence, land wastage, it is impossible to fundamentally solve the crisis of shortage of water.
The desalination of salt solution, such as desalinization water technology, by the development and perfection of decades, it has also become generally acknowledge in the world Solve one of preferred plan of shortage of water resources.
Salt solution obtains desalination water mainly two class methods, one is taking fresh water in salt solution, mainly have the way of distillation, hyperfiltration, Hydrate, solvent extraction and freezing method.The second is removing the salinity in salt solution, mainly there are electroosmose process and ion exchange Method.Two class methods respectively have advantage and disadvantage, the wherein way of distillation, freezing method, although obvious processing effect, but its power consumption is higher；Ion is handed over Change method, chemical precipitation method, hydrate and extraction and need to use chemical substance, it is relatively costly；The fouling membrane of electroosmose process is asked Topic is notable, and processing cost is high.Reverse osmosis process can be in effectively catching water various inorganic ions, colloidal substance and macromolecular it is molten Matter, so as to obtain water purification.In recent years, because reverse osmosis process is simple, energy consumption is low, is developed rapidly, is progressively applied to Seawater and brackish water desalination, boiler feed water soften and wastewater treatment, and with ion exchange combination high purity water, but its fouling membrane And high energy consumption is the bottleneck problem for restricting its development.Low pressure reverse osmosis technology as reverse osmosis technology one kind, required work Make the 1/3-1/2 of pressure only conventional reverse osmosis device, energy saving can be reached, meet the requirement of low-carbon economy, but low pressure Reverse osmosis membrane is not good for the treatment effect of high concentration brackish water.
Accordingly, it would be desirable to a kind of new technical scheme is solving above-mentioned technical problem.
The content of the invention
To solve the deficiencies in the prior art, it is an object of the invention to provide a kind for the treatment of of deionization integration desalination water Method its device.
A kind of deionization integral treatment method of desalination water, comprises the following steps：
A1, filtering：Raw water is sequentially passed through into some film filter modules, single filter water is obtained；
A2, desalination：Above-mentioned single filter water is sequentially passed through into some capacitive deionization modules, cascade filtration water is obtained；
A3, by above-mentioned cascade filtration water through low pressure reverse osmosis module be obtained water purification.
Filtering module includes micro-filtration module and ultrafiltration module in above-mentioned steps A1, for removing the suspension in raw water and having Machine thing impurity, wherein ultrafiltration module water receiving gas backwash module, and the aqueous vapor backwash module includes the water of mixed high-voltage air.
Capacitive deionization module includes constant voltage capacitive deionization module and constant current capacitive deionization in above-mentioned steps A2 Module, sequentially passes through two grades of desalinations, improves the salt rejection rate of device.
Capacitive deionization module receiving electrode regeneration module in above-mentioned steps A2, the electrode regeneration module is according to measuring electric capacity The conductivity value of deionization module water inlet water outlet, reversal connection electrode supply carries out electrode regeneration.
The processing unit of the deionization integral treatment method based on a kind of above-mentioned desalination water, by water pump, raw water according to After the secondary some film filter modules being concatenated, some capacitive deionization modules and low pressure reverse osmosis resume module, water purification is obtained.
Between above-mentioned film filter module, between film filter module and capacitive deionization module, between capacitive deionization module, Some water tanks are provided between capacitive deionization module and low pressure reverse osmosis module.
Above-mentioned film filter module includes the micro-filtration module and ultrafiltration module that are sequentially connected in series.
Above-mentioned capacitive deionization module includes the constant voltage capacitive deionization module and constant current capacitive deionization mould of series connection Block.
Further, above-mentioned ultrafiltration module water receiving gas backwash module, the aqueous vapor backwash module includes being filled by control Put the water valve and High-pressure air valve in parallel of driving；The water valve connects clean water tank, and the ultrafiltration module connects concentrated water groove.
Further, above-mentioned capacitive deionization module receiving electrode regeneration module, including the use being connected with control device respectively Enter the conductivity meter and the electrode converter of electrode connection of water and discharge water in survey capacitive deionization module；The electric capacity goes Ion module connects clean water tank and concentrated water groove.
The present invention is advantageous in that：
The deionization integral treatment method and device of a kind of desalination water of the invention, by membrane capacitance deionization technology and counter-infiltration Technology is combined, and had both been overcome the high energy consumption of conventional reverse osmosis technology, the problems such as membrane fouling rate is fast, has been also improved saline-water reclamation Treatment effect.
What the membrane capacitance module first order was used in the present invention is constant voltage（1.0-1.2 V）, realize forward osmosis membrane water outlet Quick desalination；In the second level by the way of constant current（Current density 0.2-3.5 mA/cm2, while voltage is not more than 1.2 V）, it is ensured that the stability of water outlet.
The deionization integral treatment method and device of desalination water of the invention, simple structure, easy to operate, manufacture are safeguarded Expense is low, with very strong practicality and wide applicability.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the deionization integrated treatment unit of desalination water of the invention.
The implication marked in accompanying drawing is as follows：1st, raw water box, 2, micro-filtration module, 3, one-level water tank, 4, ultrafiltration module, 5, two grades Water tank, 6, constant voltage capacitive deionization module, 7, three-level water tank, 8, constant current capacitive deionization module, 9, level Four water tank, 10, Low pressure reverse osmosis module, 11, clear water tanks, 12, clean water tank, 13, concentrated water groove, 14, control device.
Specific embodiment
Make specific introduction to the present invention below in conjunction with the drawings and specific embodiments.
A kind of deionization integrated treatment unit of desalination water as shown in Figure 1, the raw water of raw water box 1 through water pump drive according to The secondary micro-filtration module 2 being concatenated and ultrafiltration module 4, constant voltage capacitive deionization module 6 and constant current capacitive deionization module 8, And after low pressure reverse osmosis module 10 is processed, prepared water purification is stored up into clear water tanks 11.
One-level water tank 3, two grades of water tanks 5, three-level water tanks 7, level Four with water pump are sequentially provided between above-mentioned water treating module Water tank 9.
The conductivity meter being connected with control device 14 is respectively equipped with two grades of water tanks 5, three-level water tank 7, level Four water tank 9.
The electrode of constant voltage capacitive deionization module 6 and constant current capacitive deionization module 8 passes through electrode converter respectively It is connected with control device 14.
The rinse mouth of constant voltage capacitive deionization module 6 and constant current capacitive deionization module 8 connects clean water tank 12 respectively, row Dirty mouth connects concentrated water groove 13 respectively.
The water receiving gas of ultrafiltration module 4 backwashes module, including water valve and High-pressure air valve in parallel；The water valve connects clean water tank 12, the sewage draining exit of ultrafiltration module 4 connects concentrated water groove 13.
Water pump, water valve, High-pressure air valve are all driven by control device 14.
When specifically used：
With reference to a kind of deionization integral treatment method of desalination water：
A1, membrane filtration：Water pump is opened, the raw water in raw water box 1 micro-filtration module 2 and ultrafiltration module 4 is passed through, in removal raw water Suspension and organic matter, and the water after treatment is stored in one-level water tank 3 and two grades of water tanks 5 respectively, complete first step pretreatment.
Control device 14 closes the intake pump 205 of ultrafiltration module 4 per 30min, opens High-pressure air valve 207 and connection clean water tank 12 water valve 206, gas-vapor mix rinses 30 s；After flushing is finished, High-pressure air valve 207 and water valve 206 are closed, sewage enters dense Tank 13；The intake pump 205 of ultrafiltration module 4 is opened, is circulated according to this.
A2, desalination：Water pump is opened, the water in two grades of water tanks 5 is passed through constant voltage（1.0-1.2 V）Capacitive deionization mould Block, then it is passed through constant current capacitive deionization module 8（Current density 0.2-3.5 mA/cm2, voltage is not more than 1.2V）, complete 70% Desalination above, and the water after treatment is stored in three-level water tank 7 and level Four water tank 9 respectively, complete second step pretreatment.
When the numerical value of conductivity meter 102 is the 97% of the numerical value of conductivity meter 101, the i.e. electricity of constant voltage capacitive deionization module 6 During very close to adsorption saturation, 201 are switched off the pump, the water in clean water tank 12 is passed through in constant voltage capacitive deionization module 6, reversal connection Electrode supply, control voltage carries out electrode regeneration for 1.2 V, opens water pump 202 and regenerated liquid is entered into concentrated water groove 13.
When the numerical value of conductivity meter 103 is the 97% of the numerical value of conductivity meter 102, the i.e. electrode of constant current capacitive deionization module 8 When adsorption saturation, 208 are switched off the pump, the water in clean water tank 12 is passed through in constant current capacitive deionization module 8, reversal connection electricity Pole power supply, control voltage carries out electrode regeneration for 1.2 V, opens water pump 203 and backwash water is entered into concentrated water groove 13.
After electrode regeneration terminates, 202 or 203 are switched off the pump, reopen water pump 201 and water pump 208.
A3, unlatching water pump, are obtained water purification after the water of level Four water tank 9 is processed through low pressure reverse osmosis module 10, store up into water purification Case 11.
The basic principles, principal features and advantages of the present invention have been shown and described above.The technical staff of the industry should Understand, the invention is not limited in any way for above-described embodiment, it is all to be obtained by the way of equivalent or equivalent transformation Technical scheme, all falls within protection scope of the present invention.
Embodiment 1
Using from water distribution, its main water quality index is TOC=6-8 mg/L, and main organic components are humic acid, inorganic for water inlet Thing composition is sodium chloride, and electrical conductivity is 32.5 mS/cm, and water temperature is 20 DEG C.
Processing unit is made up of micro-filtration membrane module, hyperfiltration membrane assembly and membrane capacitance deionization.
Micro-filtration membrane module uses Pvdf Microporous Hollow Fiber Membrane in experiment, and membrane aperture is 0.2 μm, crosses film pressure and is less than 50 kPa, hyperfiltration membrane assembly uses polyether sulphone hollow fibre film, and retaining molecular weight is 67 kDa, and film silk effective area is 5 m2, external-compression type filtering, intake pressure 0.1MPa, using cleaning is automatically controlled, often filtering carries out air water connection in 1 hour to hyperfiltration membrane assembly Cleaning is closed, gas stamping press is 0.3 MPa, and the time is 30 s, and washing time is 30 s, and recoil time adds up to 1 min.Ultrafiltration Membrane module delivery turbidity is less than 0.2 NTU, and TOC is less than 0.5 mg/L, and electrical conductivity is less than 31.8 mS/cm.
Hyperfiltration membrane assembly water outlet passes sequentially through membrane capacitance deionization I and membrane capacitance group deionization II, each film Capacitive deionization component contains 100 groups of electrodes, and it is electrode to use active carbon fiber felt, is 10 × 10 cm per plate electrode area2, Graphite flake is collector, installs cloudy in electrode surface（Sun）Amberplex, I is under the conditions of constant voltage for membrane capacitance deionization Operation, voltage is controlled to 1.2 V, and membrane capacitance deionization II runs under galvanostatic conditions, and current control is in 1.2 mA/ cm2, water outlet conductivity is less than 10 mS/cm, and the water outlet of membrane capacitance deionization II enters low pressure reverse osmosis membrane module, reverse osmosis Permeable membrane component uses CAM, and operating pressure is 0.7-1.5 MPa, and water outlet is less than 1.2 mS/cm.
Whole set process salt rejection rate reaches 96.5%.
Embodiment 2
Using from water distribution, its main water quality index is TOC=4 mg/L for water inlet, and main organic components are humic acid, inorganic matter Composition is magnesium chloride, and electrical conductivity is 23 mS/cm, and water temperature is 20 DEG C.
Processing unit is made up of micro-filtration membrane module, hyperfiltration membrane assembly and membrane capacitance deionization.
Micro-filtration membrane module uses Pvdf Microporous Hollow Fiber Membrane in experiment, and membrane aperture is 0.2 μm, crosses film pressure and is less than 50 kPa, hyperfiltration membrane assembly uses polyether sulphone hollow fibre film, and retaining molecular weight is 67 kDa, and film silk effective area is 5 m2, external-compression type filtering, intake pressure 0.1MPa, using cleaning is automatically controlled, often filtering carries out air water connection in 1 hour to hyperfiltration membrane assembly Cleaning is closed, gas stamping press is 0.3 MPa, and the time is 30 s, and washing time is 30 s, and recoil time adds up to 1 min.
Hyperfiltration membrane assembly delivery turbidity is less than 0.2 NTU, and TOC is less than 0.5 mg/L, and electrical conductivity is less than 22.5 mS/cm. Hyperfiltration membrane assembly water outlet passes sequentially through membrane capacitance deionization I and membrane capacitance group deionization II, each membrane capacitance go from Sub-component contains 100 groups of electrodes, and it is electrode to use active carbon fiber felt, is 10 × 10 cm per plate electrode area2, graphite flake is Collector, installs cloudy in electrode surface（Sun）Amberplex, membrane capacitance deionization I runs under the conditions of constant voltage, electricity Voltage-controlled to be made as 1.2 V, membrane capacitance deionization II runs under galvanostatic conditions, and current control is in 0.7 mA/cm2, and electricity Pressure value is less than 1.2 V, and water outlet conductivity is less than 7.0 mS/cm, and the water outlet of membrane capacitance deionization II enters low pressure reverse osmosis Membrane module, reverse osmosis membrane assembly uses CAM, and operating pressure is 0.6-1.5 MPa, and water outlet is less than 0.8 mS/cm.
Whole set process salt rejection rate reaches 97.8%.

Claims (10)

1. the deionization integral treatment method of a kind of desalination water, it is characterised in that comprise the following steps：
A1, filtering：Raw water is sequentially passed through into some film filter modules, single filter water is obtained；
A2, desalination：Above-mentioned single filter water is sequentially passed through into some capacitive deionization modules, cascade filtration water is obtained；
A3, by above-mentioned cascade filtration water through low pressure reverse osmosis module be obtained water purification.
2. a kind of deionization integral treatment method of desalination water according to claim 1, it is characterised in that the step Filtering module includes micro-filtration module and ultrafiltration module, ultrafiltration module water receiving gas backwash module in A1.
3. a kind of deionization integral treatment method of desalination water according to claim 1, it is characterised in that the step Capacitive deionization module includes constant voltage capacitive deionization module and constant current capacitive deionization module in A2.
4. a kind of deionization integral treatment method of desalination water according to claim 1, it is characterised in that the step Capacitive deionization module receiving electrode regeneration module in A2, the electrode regeneration module is intake out according to capacitive deionization module is measured The conductivity value of water, reversal connection electrode supply carries out electrode regeneration.
5. the processing unit of the deionization integral treatment method based on a kind of any described desalination waters of claim 1-4, its It is characterised by, by water pump, some film filter modules, some capacitive deionization modules and the low pressure that raw water is concatenated successively are anti- After osmosis module treatment, water purification is obtained.
6. a kind of deionization integrated treatment unit of desalination water according to claim 5, it is characterised in that the film mistake Filter module between, between film filter module and capacitive deionization module, between capacitive deionization module, capacitive deionization module with Some water tanks are provided between low pressure reverse osmosis module.
7. a kind of deionization integrated treatment unit of desalination water according to claim 5, it is characterised in that the film mistake Filter module includes the micro-filtration module and ultrafiltration module that are sequentially connected in series.
8. a kind of deionization integrated treatment unit of desalination water according to claim 5, it is characterised in that the electric capacity Deionization module includes the constant voltage capacitive deionization module and constant current capacitive deionization module of series connection.
9. a kind of deionization integrated treatment unit of desalination water according to claim 7, it is characterised in that the ultrafiltration Module water receiving gas backwashes module, and the aqueous vapor backwash module includes the water valve in parallel and the high pressure gas that are driven by control device Valve；The water valve connects clean water tank, and the ultrafiltration module connects concentrated water groove.
10. a kind of deionization integrated treatment unit of desalination water according to claim 5, it is characterised in that the electricity Hold deionization module receiving electrode regeneration module, the electrode regeneration module with control device including being connected for surveying electric capacity respectively Deionization module enters the conductivity meter and the electrode converter of electrode connection of water and discharge water；The capacitive deionization module Connect clean water tank and concentrated water groove.
CN201710096428.4A 2017-02-22 2017-02-22 The deionization integral treatment method and device of a kind of desalination water Pending CN106830451A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107445259A (en) * 2017-09-20 2017-12-08 江苏科技大学 A kind of small-sized household capacitive deionization water purifier
CN110508027A (en) * 2019-09-06 2019-11-29 江苏美淼环保科技有限公司 The high-purity medicine for having membrane capacitance Electro Sorb process plants extract preparation process

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60132604A (en) * 1983-12-19 1985-07-15 Toray Eng Co Ltd Method for concentrating and recovering organic valuables
CN102786174A (en) * 2012-03-29 2012-11-21 波鹰(厦门)科技有限公司 Seawater desalination device and method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60132604A (en) * 1983-12-19 1985-07-15 Toray Eng Co Ltd Method for concentrating and recovering organic valuables
CN102786174A (en) * 2012-03-29 2012-11-21 波鹰(厦门)科技有限公司 Seawater desalination device and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107445259A (en) * 2017-09-20 2017-12-08 江苏科技大学 A kind of small-sized household capacitive deionization water purifier
CN110508027A (en) * 2019-09-06 2019-11-29 江苏美淼环保科技有限公司 The high-purity medicine for having membrane capacitance Electro Sorb process plants extract preparation process

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Application publication date: 20170613