CN105923704A - Forward osmosis draw fluid recycling method, wastewater treatment method and treatment device - Google Patents
Forward osmosis draw fluid recycling method, wastewater treatment method and treatment device Download PDFInfo
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- CN105923704A CN105923704A CN201610284589.1A CN201610284589A CN105923704A CN 105923704 A CN105923704 A CN 105923704A CN 201610284589 A CN201610284589 A CN 201610284589A CN 105923704 A CN105923704 A CN 105923704A
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- ion exchange
- exchange membrane
- liquid
- forward osmosis
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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
-
- 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
- C02F1/445—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by forward osmosis
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5209—Regulation methods for flocculation or precipitation
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F2001/5218—Crystallization
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention provides a recycling method of a forward osmosis draw fluid. According to the invention, diluted draw fluid produced during a forward osmosis process is subjected to a concentration treatment with an ion exchange membrane; and the concentrated draw fluid is recycled and reused in the forward osmosis process. The invention also provides a wastewater treatment method and a wastewater treatment device. According to the recycling method, the wastewater treatment method and the treatment device provided by the invention, a combination of forward osmosis and ion exchange membrane concentration is adopted. No additional pressure or small additional pressure is needed during the forward osmosis process and the ion exchange membrane concentration process. The method is simple and feasible, and has the advantages of easy operation and low energy consumption. Also, membrane pollution of the forward osmosis process and the ion exchange membrane concentration process is low, and continuous stable operation times of the two processes are prolonged. With the method, a large amount of pure product water can be obtained, and wastewater recycling rate is improved to a maximal extent. The methods and the device bring important environmental benefit.
Description
Technical field
The present invention relates to field of industrial waste water treatment, be specifically related to a kind of circulating and recovering just permeating and drawing liquid
Method and a kind of method of wastewater treatment and processing means.
Background technology
Just permeating (FO) is that a kind of membrane separating process relying on osmotic pressure to drive, i.e. water are by selectivity half
It is (high that permeable membrane is spontaneously diffused into relatively low water chemistry gesture region from higher water chemistry gesture region (Hyposmolality side)
Osmotic pressure side) process.The driving force of positive process of osmosis is to draw oozing of liquid (driving liquid) and material liquid
Pressure reduction thoroughly, it is not necessary to impressed pressure is as driving force.Compare with reverse osmosis process, just permeating have as follows
Advantage: fouling membrane is lighter, it is not necessary to impressed pressure, energy consumption is low, and the response rate is high, and concentrated water drainage is high-volume few, dirty
Contaminate little.
That positive process of osmosis realizes it is crucial that need what a kind of high flux can be recycled to draw liquid, just permeate
During, along with the spontaneous diffusion of water, draw liquid and progressively diluted, in order to recycle, need to be to drawing
Liquid processes, and this is the key factor of positive osmosis system energy stable operation, is also water technology personnel
One of emphasis direction of research and development.Mostly existing liquid processing mode of drawing is to utilize the mode of rectification will draw liquid essence
Evaporate rear resynthesis, thus realize Reusability, due to rectification need high-temperature steam etc. as thermal source, simultaneously
The shortcomings such as rectifier unit operating flexibility is little make whole positive osmosis system operation operating reliability be substantially reduced.
High salt high-COD waste water refers to that high concentration dissolubility inorganic salt is in more than 5000mg/L, COD value
At the waste water of more than 800mg/L, the waste water of main representative such as pharmaceutical intermediate wastewater, textile industry are raw
Produce printing and dyeing reuse concentrated solution waste water, the fermentation of food-processing industry discharge and cleanout fluid, the oil field discharged to give up
Water, paper waste, shale gas waste water, coal chemical industrial waste water, oil refining waste water etc..Current process should
The various methods of class waste water have complex treatment process, treatment effect poor controllability, processing cost are high lacks
Point.
Chinese patent CN 104803448 A relates to the just infiltration of high salinity height organic concentration waste water and processes
Method, the method for employing is that one is just permeating coupling multiple-effect evaporation.Chinese patent CN 104803451 A relates to
And it is logical just to permeate the process for desalinating seawater and device combined with reverse osmosis technology, the method and device
Cross and reverse osmosis concentrated draining is drawn liquid as positive process of osmosis, efficiently solve the place of reverse osmosis concentrated draining
Reason problem.Chinese patent CN 104591457 A relates to just permeating coupled film distillation and processes the device of waste water
And method, the method and device are by drawing liquid, effectively using the dense water of Membrane Materials as positive process of osmosis
Solve the process problem of the dense water of Membrane Materials.Chinese patent CN 104624052 A relates to one and just permeates
Drawing the circulation reuse method of liquid, the liquid that draws being diluted because of positive process of osmosis passes through freezing and crystallizing, receives
Filter regenerates after concentrating, and the positive process of osmosis of liquid return of drawing after regeneration is circulated utilization.Above-mentioned specially
Profit is all to use just to permeate at coupling reverse osmosis, multiple-effect evaporation, film distillation technology, freezing and crystallizing technology
Reason waste water or solution, in these technology, exists and draws that liquid kind is limited, processing safety is poor, power consumption is high
Etc. defect.
Summary of the invention
For overcoming, existing positive osmosis process draws the defect that liquid process exists, it is an object of the invention to
There is provided a kind of and just permeating the circulation reuse method drawing liquid.
It is a further object of the present invention to provide a kind of method of wastewater treatment and a kind of waste water processes dress
Put.
What the present invention provided just permeate draws the circulation reuse method of liquid and is: will produce in positive process of osmosis
Draw liquid after raw dilution and carry out concentration by ion exchange membrane, after concentration, draw liquid
Circulating and recovering is to described positive process of osmosis.
Ion exchange membrane just has in desalination field as far back as eighties of last century be widely applied very much the seventies,
Product water water quality is good, salt rejection rate high (more than 90%), Water Sproading rate high, energy consumption is low, processes at water
Field, typically directly utilize the desalination characteristic of ion exchange membrane to remove salts substances therein, but
The most gradually replaced by reverse osmosis membrane, NF membrane etc..Along with the development of positive infiltration technology, draw liquid
Carrying out having vital effect for positive process of osmosis, the inventors discovered that, ion exchanges
The high desalination characteristic of film is applicable to draw the concentration of liquid, can make to draw liquid and obtain good following
Loopback use, thus ensure that the stable operation and water treatment efficiency just permeated.
What the present invention provided just permeate draws the circulation reuse method of liquid and is applicable to existing any kind
Just permeating and drawing liquid, drawing liquid and can include such as chloride, sulfate, carbonate, bicarbonate etc.
Solution, includes but not limited to corresponding sodium salt, potassium salt, magnesium salt, calcium salt, ammonium salt etc., the suitableeest
For the sulfate such as magnesium sulfate, calcium sulfate.
The method of wastewater treatment that the present invention provides, comprises the following steps:
(1) pending waste water is processed by just infiltration, just oozing for the liquid that draws just permeated
It is diluted during Tou；
(2) draw liquid after dilution step (1) obtained to be concentrated to give by ion exchange membrane
Product water after process, the liquid that draws after concentration returns step (1) recycling.
In processing method of the present invention, also included pending is given up before positive process of osmosis
Water carries out pretreatment.The step of pretreatment or mode can be adjusted according to waste water quality difference, bag
Include but be not limited to the one or multi-step in deoiling step, oil removal step.
In processing method of the present invention, after just infiltration processes, the dense water of gained can use existing
Method processes or recycles, and includes but not limited to enter just permeating the dense water of just infiltration obtained
Row crystallization treatment.
In processing method of the present invention, described pending waste water can be various industry or life
The waste water that life birth is raw, especially industry high-salt wastewater, processing method of the present invention is applicable to many
Planting the waste water of water quality characteristic, if the pH value of waste water can be 3～10, useless electrical conductivity of water can be
20000～65000 μ s/cm, the CODcr of waste water can be 100～50000mg/L.
In processing method of the present invention, in described step (2), after concentration, draw liquid conductance
Rate is 200,000～280,000 μ s/cm.
In processing method of the present invention, in the concentration process of described step (2): ion exchanges
The pH value of film feeding liquid side is 6.5～8.5, and temperature is 20～40 DEG C, and crossflow velocity is 5～5～8
cm/s。
In processing method of the present invention, the operating condition of positive process of osmosis is: feeding liquid side,
PH value of waste water is 6.5～8.5, and wastewater temperature is 20～40 DEG C, and both sides crossflow velocity is 0.1～0.5
m/s。
In processing method of the present invention, the dense water conductivity scope that just infiltration is obtaining after processing can
Reach 180,000～250,000 μ s/cm.
In processing method of the present invention, positive process of osmosis is drawn liquid and is constantly diluted, dilution
Setting concentration can be 2～4 times of pending conductivity of waste water.
The wastewater treatment equipment that the present invention provides, including following processing unit:
Positive permeation unit, is provided with one or more groups forward osmosis membrane assembly, for giving up pending
Water carries out just infiltration and processes；And
Ion exchange membrane unit, is provided with one or more groups ion exchange membrane assembly, for will just ooze
Thoroughly draw liquid after the produced dilution of unit to carry out concentrating and make its circulating and recovering just permeating list to described
Unit.
In the wastewater treatment equipment that the present invention provides, the membrane material of described forward osmosis membrane assembly can be selected for
Existing any kind, includes but not limited to the acid of PTFE, PS, CA/CAT, perfluor sulphur (carboxylic)
Etc..The membrane material of ion exchange membrane assembly also can be selected for existing any kind, including but do not limit
In styrene-divinylbenzene copolymer membrane etc..
In the wastewater treatment equipment that the present invention provides, described ion exchange membrane kit form can be existing
Some arbitrary forms, include but not limited to plate and frame etc..Described forward osmosis membrane kit form also may be used
Select existing arbitrary form, include but not limited to plate and frame, rolling, hollow fiber form, tubular type
Etc..
In the wastewater treatment equipment that the present invention provides, when described forward osmosis membrane assembly or described ion are handed over
When changing membrane module for organizing, multi-grade module can be to be arranged in parallel, it is also possible to for being arranged in series more.
In the wastewater treatment equipment that the present invention provides, described wastewater treatment equipment can also include pre-place
Reason unit, it is connected with the water inlet end of described positive permeation unit.Pretreatment unit is for by pending
Waste water carry out pretreatment.
In the wastewater treatment equipment that the present invention provides, described pretreatment unit can be according to waste water quality
It is configured, includes but not limited to oil removing unit, oil removal unit etc..
In the wastewater treatment equipment that the present invention provides, described wastewater treatment equipment can also include crystallization
Unit, it is connected with the dense water water side of described positive permeation unit.Crystalline element just oozes for processing
The dense water of gained thoroughly, to remove wherein salt.
The present invention possesses advantages below:
1, ion exchange membrane is concentrated and is used for just permeating the circulating and recovering drawing liquid, for just permeating by the present invention
Process waste water, recycle-water resource provides stability and reliability.Ion exchange membrane is applicable to various species
Draw liquid, including in water treatment technology produce containing the dense water of carnallite, provide new application for carnallite resource,
Be used for carnallite just permeating draws liquid, decreases operating cost, has reused again resource.Ion is handed over
Change film and carry out desalination and concentration by ion migration, compared with the condensing mode of rectification and Membrane Materials, it is possible to be steady
Surely higher enrichment is reached, can further investment reduction and operating cost.Additionally, due to draw liquid
Highly enriched degree, moreover it is possible to significantly improve the dense water enrichment just permeated, thus can improve and just permeate process effect
Rate, reduces dense water treating capacity.Relative to the existing liquid processing method that draws, the method running cost of the present invention
With low, applied widely, enrichment is high, water utilization rate is high, material require low.
2, the method for wastewater treatment of the present invention and device use and just permeate+the combination that concentrates of ion exchange membrane,
Positive process of osmosis and ion exchange membrane concentration process all need not impressed pressure or only need less external pressure pressure
Power, simple, easily operate, energy consumption is extremely low；And, positive process of osmosis and ion exchange membrane concentrate
The fouling membrane of process is the lightest, extends the continuous and steady operation time of two processes, reduce further
Cost of water treatment, it is possible to obtain lot of pure produces water, improves the response rate of waste water to greatest extent, has
Important environmental benefit.
3, the present invention provides method of wastewater treatment and processing means are particularly suited in prior art being difficult to
The high-salt wastewater processed, the product water power after process leads≤500 μ s/cm, CODcr < 10mg/L, Water Sproading
Rate is higher than 90%, even more than 95%, and the degree that dense water concentrates is high, processes load big.
4, the present invention provides processing method and processing means are possible not only to process high-salt wastewater, it is also possible to
Process river as required, bitter, sea water, surface water, municipal wastewater, petrochemical wastewater, rubbish ooze
The solution of filtrate waste water, drug containing, saccharide or protein etc., shale gas waste water, coal chemical industrial waste water, with
And the reverse osmosis concentrated water in waste water recycling etc. polytype waste water.
Accompanying drawing explanation
Fig. 1 is the wastewater treatment equipment schematic diagram of the present invention；
In figure: 1, positive permeation unit；101, former pond is just being permeated；102, raw water pump is just being permeated；103、
Just permeating and drawing liquid pool；104, just permeating and drawing liquid pump；2, ion exchange membrane unit；201, ion
The former pond of exchange membrane；202, ion exchange membrane raw water pump；203, the dense water pump of ion exchange membrane；3, pre-
Processing unit；4, crystalline element；
A, waste water；Waste water after B, pretreatment；C, pure water；D, draw liquid；E, just permeate dense water；
Liquid is drawn after F, dilution；Liquid is drawn after G, concentration；H, ion exchange membrane produce water.
Detailed description of the invention
Below, in conjunction with the accompanying drawings and embodiments, invention is further described.
As it is shown in figure 1, the wastewater treatment equipment of the present invention includes positive permeation unit 1 and ion exchange membrane
Unit 2, positive permeation unit 1 processes for pending waste water carries out just infiltration, is provided with one
Group or many group forward osmosis membrane assemblies, ion exchange membrane unit 2 is for by dilute produced by positive permeation unit 1
Draw liquid after releasing to carry out concentrating and make its circulating and recovering to positive permeation unit 1, be provided with one group or many
Group ion exchange membrane assembly.
In one embodiment, the wastewater treatment equipment of the present invention can also include just permeating former pond
101, just permeating raw water pump 102, just permeating and draw liquid pool 103 and just permeating and draw liquid pump 104.
In one embodiment, the wastewater treatment equipment of the present invention also includes the former pond of ion exchange membrane
201, ion exchange membrane raw water pump 202 and the dense water pump of ion exchange membrane 203.
In one embodiment, the wastewater treatment equipment of the present invention can also include pretreatment unit 3,
Pretreatment unit 3 can need to be set to oil removing and/or oil removal unit according to pretreatment, including but not
It is limited to oil removal flotation tank, suspension sedimentation tank etc..
In one embodiment, the wastewater treatment equipment of the present invention can also include for just permeating dense water
Processing unit, can be such as crystalline element 4, be used for aligning the dense water of infiltration and carry out crystallization treatment, with
Process or reclaim material contained therein.
During as it is shown in figure 1, the wastewater treatment equipment of the present invention runs, pending waste water A initially enters
Pretreatment unit 3 carries out pretreatment, and after obtaining pretreatment, waste water B enters and just permeating former pond 101, when
Pending waste water A water quality meets when just permeating inflow requirement, it is possible to the most preprocessed being directly entered just is oozed
In saturating former pond 101.The waste water just permeated in former pond 101 just pumps into by just permeating raw water pump 102
In permeation unit 1.Meanwhile, draw liquid D to draw liquid pump 104 and draw liquid pool by just permeating by just permeating
Positive permeation unit 1 is pumped in 103, the forward osmosis membrane assembly arranged by positive permeation unit 1, water inlet point
From becoming pure water C and just permeating dense water E, pure water C dilution is drawn after liquid D is diluted and is drawn liquid F,
It is discharged into the former pond of ion exchange membrane 201, pumps into ion through ion exchange membrane raw water pump 202 the most again and hand over
Changing film unit 2, will draw liquid F by ion exchange membrane assembly and concentrate, ion exchange membrane produces water H
Recycling, draw liquid G and pump into just to permeate and draw circulating and recovering in liquid pool 103 after concentration, ion exchanges
The dense water pump of film 203 circulates into dense water material.Just permeate dense water E and carry out crystallization treatment by crystalline element 4,
Thus complete waste water to process.
Embodiment 1
The water quality characteristic of pending high-salt wastewater (the oil field fracturing fluid waste water of certain high-salt sewage) is: useless
Water pH8.35, electrical conductivity 20000 μ about s/cm, CODcr 8350mg/L, Cl-43500mg/L,
Oil-containing: 80mg/L, float: 1000mg/L.
Forward osmosis membrane assembly used is cellulose acetate plate and frame module；Ion exchange membrane be styrene-
Divinylbenzene copolymer membrane plate and frame module, membrane aperture is 0.2 μm.
Pre-treatment step includes that efficient oil removal flotation tank removes oils, efficient suspension sedimentation tank is removed and suspended
Thing.
Drawing liquid is Adlerika, in wastewater treatment equipment running, and the operation bar of positive process of osmosis
Under part: feeding liquid side, wastewater pH 8.35, wastewater temperature 25 DEG C, crossflow velocity 0.5m/s, just permeates
Membrane flux is maintained at 6L/m2About h；Under the operating condition of ion exchange membrane process: feeding liquid side, pure
Water pH 8.5, pure water temperature 30 DEG C, crossflow velocity 7cm/s.
It is 450 μ s/cm that product water power after treatment is led, CODcr < 10mg/L, Water Sproading rate 95.6%,
Just permeate dense water concentration and stably reach about 20%.
It is the water treatment system drawing liquid endless form relative to Membrane Materials, rectification, operating cost as little as
Half (ton water consumption about 10 yuan, Membrane Materials and energy consumption of rectification about 20 yuan), cycle of operation significantly increases
Long (cycle of operation can reach 1 year, and Membrane Materials, rectification need soda acid to clean to half a year in three months).
Embodiment 2
The water quality characteristic of pending high-salt wastewater (sewage treatment plant's reverse osmosis concentrated water): wastewater pH 8, electricity
Conductance 20000 μ about s/cm, CODcr 15000mg/L, Ca2+About 30mg/L, Mg2+20mg/L
Left and right, molten silicon about 50mg/L, NH3-N about 1000mg/L.This water is pretreated rubbish
Percolate water.
Forward osmosis membrane assembly used is cellulose acetate plate and frame module；Ionic membrane assembly used is benzene second
Alkene-divinylbenzene copolymer membrane plate and frame module, membrane aperture is 0.2 μm.
The pre-treatment step sedimentation tank that includes efficiently suspending removes oil removal.
Drawing liquid is Adlerika, in wastewater treatment equipment running, and the operation bar of positive process of osmosis
Under part: feeding liquid side, wastewater pH 8, wastewater temperature 25 DEG C, crossflow velocity 0.5m/s, forward osmosis membrane
Flux is maintained at 8L/m2About h；Under the operating condition of ion exchange membrane process: feeding liquid side, pure water
PH 7.8, pure water temperature 30 DEG C, crossflow velocity 7cm/s.
It is 390 μ s/cm that product water power after treatment is led, CODcr < 10mg/L, Water Sproading rate 95%,
Just permeate dense water concentration and stably reach about 20%.
It is the water treatment system drawing liquid endless form relative to Membrane Materials, rectification, operating cost as little as
Half (ton water consumption about 10 yuan, Membrane Materials and energy consumption of rectification about 20 yuan), cycle of operation significantly increases
Long (cycle of operation can reach 1 year, and Membrane Materials, rectification need soda acid to clean to half a year in three months).
Embodiment 3
Pending high-salt wastewater belongs to the reverse osmosis concentrated water of Coal Chemical Industry, water quality characteristic: pH 8.0, TDS
23935mg/L, CODcr 300mg/L, Cl-13812mg/L, Na+8749mg/L, HCO3 -882
Mg/L, Ca2+399mg/L。
Forward osmosis membrane assembly used is cellulose acetate plate and frame module；Ionic membrane assembly used is benzene second
Alkene-divinylbenzene copolymer membrane plate and frame module, membrane aperture is 0.2 μm.
Pre-treatment step includes that efficient sedimentation tank removes oil removal.
Drawing liquid is calcium sulphate soln, wastewater treatment equipment in running, the operation of positive process of osmosis
Under the conditions of: feeding liquid side, wastewater pH 8, wastewater temperature 25 DEG C, crossflow velocity 0.5m/s, just permeate
Membrane flux is maintained at 5L/m2About h；Under the operating condition of ionic membrane process: feeding liquid side, pure water
PH7.9, pure water temperature 22 DEG C, crossflow velocity 6cm/s.
Product water power after treatment leads≤500 μ s/cm, CODcr < 10mg/L, and Water Sproading rate is higher than
90%, just permeate dense water concentration and stably reach about 20%.
It is the water treatment system drawing liquid endless form relative to Membrane Materials, rectification, operating cost as little as
Half (ton water consumption about 10 yuan, Membrane Materials and energy consumption of rectification about 20 yuan), cycle of operation significantly increases
Long (cycle of operation can reach 1 year, and Membrane Materials, rectification need soda acid to clean to half a year in three months).
Embodiment 4
Pending high-salt wastewater belongs to refuse leachate waste water, water quality characteristic: wastewater pH 7.8, TDS
15000mg/L, CODcr 10000mg/L, Cl-13812mg/L, NH3-N 1200mg/L, SS:
1000mg/L。
Forward osmosis membrane assembly used is cellulose acetate plate and frame module；Ionic membrane assembly used is benzene second
Alkene-divinylbenzene copolymer membrane plate and frame module, membrane aperture is 0.2 μm.
Pre-treatment step includes that first passing through flotation tank removes oils, hangs through the removal of efficient suspension sedimentation tank
Float.
Drawing liquid is metabisulfite solution, wastewater treatment equipment in running, the operation of positive process of osmosis
Under the conditions of: feeding liquid side, wastewater pH 8, wastewater temperature 25 DEG C, crossflow velocity 0.5m/s, just permeate
Membrane flux is maintained at 8L/m2About h；Under the operating condition of ionic membrane process: feeding liquid side, pure water
PH7.9, pure water temperature 22 DEG C, crossflow velocity 7cm/s.
It is 480 μ s/cm that product water power after treatment is led, CODcr < 10mg/L, Water Sproading rate 93%,
Dense water concentration stably reaches about 20%.
It is the water treatment system drawing liquid endless form relative to Membrane Materials, rectification, operating cost as little as
Half (ton water consumption about 10 yuan, Membrane Materials and energy consumption of rectification about 20 yuan), cycle of operation significantly increases
Long (cycle of operation can reach 1 year, and Membrane Materials, rectification need soda acid to clean to half a year in three months).
Embodiment 5
Pending high-salt wastewater belongs to dye intermediate wastewater, water quality characteristic: wastewater pH 1.7, TDS
23935mg/L, CODcr 36000mg/L, BOD 506mg/L, Cl-13663mg/L, Na+8749
Mg/L, HCO3 -882mg/L, Ca2+5825mg/L, SS:606mg/L, colourity: 3750 degree,
NH4-N 1000mg/L。
Forward osmosis membrane assembly used is cellulose acetate plate and frame module；Ionic membrane assembly used is benzene second
Alkene-divinylbenzene copolymer membrane plate and frame module, membrane aperture is 0.2 μm.
Pre-treatment step includes the hardness part colourity float in sedimentation tank removal waste water that efficiently suspends.
Drawing liquid is Adlerika, wastewater treatment equipment in running, the operation of positive process of osmosis
Under the conditions of: feeding liquid side, wastewater pH 8, wastewater temperature 25 DEG C, crossflow velocity 0.5m/s, just permeate
Membrane flux is maintained at 10L/m2About h；Under the operating condition of ionic membrane process: feeding liquid side, pure water
PH7.9, pure water temperature 22 DEG C, crossflow velocity 7cm/s.
It is 350 μ s/cm that product water power after treatment is led, CODcr < 10mg/L, Water Sproading rate 93%,
Dense water concentration stably reaches about 20%.
It is the water treatment system drawing liquid endless form relative to Membrane Materials, rectification, operating cost as little as
Half (ton water consumption about 10 yuan, Membrane Materials and energy consumption of rectification about 20 yuan), cycle of operation significantly increases
Long (cycle of operation can reach 1 year, and Membrane Materials, rectification need soda acid to clean to half a year in three months).
Unless limited otherwise, term used herein is the implication that those skilled in the art are generally understood that.
Embodiment described in the invention is merely for exemplary purpose, and is not used to limit the present invention
Protection domain, those skilled in the art can be made within the scope of the invention various other replace,
Changes and improvements, thus, the invention is not restricted to above-mentioned embodiment, and be only defined by the claims.
Claims (9)
1. one kind is just being permeated the circulation reuse method drawing liquid, it is characterised in that by positive process of osmosis
Draw liquid and carry out concentration by ion exchange membrane after the dilution produced, after concentration, draw liquid
Circulating and recovering is to described positive process of osmosis.
Circulation reuse method the most according to claim 1, it is characterised in that described in draw liquid bag
Include the solution of one or more of following salt apoplexy due to endogenous wind: sodium, potassium, magnesium, calcium, the chloride of ammonium, sulphuric acid
Salt, carbonate or bicarbonate.
3. a method of wastewater treatment, it is characterised in that comprise the following steps:
(1) pending waste water is processed by just infiltration, just oozing for the liquid that draws just permeated
It is diluted during Tou；
(2) draw liquid after dilution step (1) obtained to be concentrated to give by ion exchange membrane
Product water after process, the liquid that draws after concentration returns step (1) recycling.
Processing method the most according to claim 3, it is characterised in that described processing method is just
Also include before process of osmosis pending waste water is carried out pretreatment；Described pretreatment includes that oil removing walks
Suddenly, the one or multi-step in oil removal step.
Processing method the most according to claim 3, it is characterised in that described processing method is also wrapped
Include the dense water of just infiltration step (1) obtained and carry out crystallization treatment.
6. according to the processing method described in any one of claim 3-5, it is characterised in that described in wait to locate
The waste water of reason is high-salt wastewater, and its water quality characteristic meets following the most one or more: pH value is 3～10,
Electrical conductivity be 20000～65000 μ s/cm or CODcr be 100～50000mg/L.
7. a wastewater treatment equipment, it is characterised in that include following processing unit:
Positive permeation unit, is provided with one or more groups forward osmosis membrane assembly, for pending waste water
Carry out just infiltration to process；And
Ion exchange membrane unit, is provided with one or more groups ion exchange membrane assembly, for will just permeate
Draw liquid after the produced dilution of unit to carry out concentrating and make its circulating and recovering to described positive permeation unit.
Processing means the most according to claim 7, it is characterised in that described forward osmosis membrane assembly
Material selected from PTFE or CA/CAT, form is plate and frame.
Processing means the most according to claim 7, it is characterised in that described ion exchange membrane group
The membrane material of part is selected from styrene-divinylbenzene copolymer.
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| CN107098530A (en) * | 2017-05-02 | 2017-08-29 | 山东博润工业技术股份有限公司 | A kind of positive osmosis treatment system of chloro alcali wastewater and handling process |
| CN108083857A (en) * | 2017-12-21 | 2018-05-29 | 常州大学 | A kind of method that feces of livestock and poultry biogas slurry integrated treatment prepares liquid organic fertilizer |
| CN109646743A (en) * | 2019-01-07 | 2019-04-19 | 哈尔滨工业大学（威海） | A kind of method of haemodialysis waste water recycling |
| CN109734236A (en) * | 2019-03-05 | 2019-05-10 | 上海缘脉环境科技有限公司 | A kind of positive osmosis concentration technique of landfill leachate |
| CN109850996A (en) * | 2019-02-25 | 2019-06-07 | 上海缘脉环境科技有限公司 | A kind of processing method of power plant desulfurization wastewater |
| CN112209547A (en) * | 2019-07-10 | 2021-01-12 | 苏州诺津环保科技有限公司 | Concentration and reduction method for high-salinity high-organic matter aqueous solution |
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| CN114249466A (en) * | 2021-12-07 | 2022-03-29 | 哈尔滨工业大学 | Electrocatalytic oxidation combined forward osmosis treatment method for reverse osmosis concentrated water in coal chemical industry |
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