CN107321186A - A kind of nanofiltration, the online reverse cleaning method and device of hyperosmosis of reverse osmosis membrane - Google Patents
A kind of nanofiltration, the online reverse cleaning method and device of hyperosmosis of reverse osmosis membrane Download PDFInfo
- Publication number
- CN107321186A CN107321186A CN201710702705.1A CN201710702705A CN107321186A CN 107321186 A CN107321186 A CN 107321186A CN 201710702705 A CN201710702705 A CN 201710702705A CN 107321186 A CN107321186 A CN 107321186A
- Authority
- CN
- China
- Prior art keywords
- water
- pressure
- strong brine
- reverse osmosis
- reverse
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/10—Accessories; Auxiliary operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/025—Reverse osmosis; Hyperfiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/027—Nanofiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/12—Controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- 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
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2311/00—Details relating to membrane separation process operations and control
- B01D2311/14—Pressure control
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Nanotechnology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a kind of nanofiltration, the online reverse cleaning method and device of hyperosmosis of reverse osmosis membrane, with the NF membrane generally used at present, based on reverse osmosis membrane system, the strong brine that is produced by the use of counter-infiltration production process with the addition of the strong brine of electrolyte the hyperosmosis produced in NF membrane or reverse osmosis membrane injected as raw water, pass through the control to strong brine osmotic pressure and the flow of film, production water is reversed " sucking back " to membranous system in the presence of concentrated water osmotic pressure, and discharge membranous system with strong brine, realize reverse cleaning, and disclose reverse cleaning method, the present invention utilizes the strong brine of the generation in reverse osmosis process, realize NF membrane, the explosive filling free operation and explosive filling free cleaning of reverse osmosis membrane, cleaning process does not need high-pressure pump to be stopped, it is short with scavenging period section, the characteristics of without manual intervention, it ensure that NF membrane simultaneously, the safety of the structure of reverse osmosis membrane, reduce the operating cost of film, eliminate medicament expense use, and extend the life-span of film.
Description
Technical field
The invention belongs to technical field of membrane, more particularly to a kind of nanofiltration, the online reverse cleaning of hyperosmosis of reverse osmosis membrane
Method and device.
Background technology
Pellicle is referred to as to the selective film of material of transmission, when the weak solution (such as fresh water) same volume
When being respectively placed in the both sides of pellicle with concentrated solution (such as salt solution), solvent in weak solution will naturally through pellicle and it is spontaneous
Ground flows to concentrated solution side, and this phenomenon is referred to as infiltration.When infiltration reaches balance, the liquid level of concentrated solution side can compare weak solution
Liquid level be higher by certain altitude, that is, formed a pressure difference, this pressure difference is osmotic pressure.The size of osmotic pressure depends on consolidating for solution
Have property, i.e., with the species, concentration and temperature of concentrated solution about and with pellicle property it is unrelated.If applying in concentrated solution side
One be more than osmotic pressure pressure when, the flow direction of solvent will be in opposite direction with original infiltration, start from concentrated solution to dilute
Solution side is flowed, and this process is referred to as counter-infiltration.Counter-infiltration is a kind of reverse travel motion of infiltration, is that one kind is driven in pressure
Under dynamic, the separation method for being separated the solute in solution and solvent by means of the selective retention effect of pellicle, it extensively should
For the purification and concentration of various liquid, wherein most common application example is in water treatment technology, to use reverse osmosis technology
The impurity such as the inorganic ions in raw water, bacterium, virus, organic matter and colloid are removed, to obtain high-quality pure water.
Film can be divided into microfiltration membranes, milipore filter, NF membrane and reverse osmosis membrane by film according to the difference in its aperture.Ultrafiltration is a kind of
Pressure-driven membrane filtration processes, rely primarily on particulate matter and larger molecular organicses in screening mechanism separation water, the hole of milipore filter
Footpath is 0.002 micron~0.1 micron, and dissolving material and the material smaller than ultrafiltration membrane aperture can pass through filter membrane, and than ultrafiltration fenestra
The big material in footpath can not be retained down through milipore filter, be discharged with concentrate.Therefore ion is comprised only and small in production water
Molecular substance, and colloidal substance, particle, bacterium and virus are removed by milipore filter.
Different from milipore filter, the membrane aperture of reverse osmosis membrane is smaller, the diameter of surface micropore it is general 0.5~10 nanometer it
Between.It is operated using principle of reverse osmosis.Reverse osmosis membrane can be by the inorganic ions in raw water, bacterium, virus, organic matter
And the impurity such as colloid is removed, to obtain high-quality pure water.Nanofiltration is that a kind of pressure between counter-infiltration and ultrafiltration drives
Dynamic membrane separating process, the pore diameter range of NF membrane is in several rans.Nanofiltration mainly applies to drinking water and industrial water
In purifying, wastewater purification, process fluid in terms of the concentration of valuable composition.Therefore, reverse osmosis membrane and point of NF membrane
Need pressure-driven to overcome osmotic pressure from process to produce pure water (production water).
Fouling membrane refer to handle material in particulate, colloidal particle and solute transportation due to there is physical chemistry work with film
With or mechanism caused by absorption, deposition are caused in film surface and membrane aperture membrane aperture diminish or block, produce film saturating
The irreversible change phenomenon of inflow-rate of water turbine and separation characteristic.For fouling membrane, once material is contacted with film, fouling membrane is to start.
The pollution type of reverse osmosis membrane can be divided into particle contamination, colloid pollution, chemical contamination and microorganism pollution.It is most normal in membrane contaminant
See for calcium carbonate scale, calcium sulfate scale, metal oxide dirt, silicon deposits and organic or biogenic deposits.It is essentially all of
All contain microorganism in raw water, i.e., virus, bacterium, fungi, algae, thermal source also have other higher organisms.These microorganisms are entering
Enter during reverse osmosis membrane, using permeable membrane as carrier, the flourish by the nutritive salt of reverse osmosis concentrated salt solution section concentration makes production
Water and salt rejection rate decline, and are contaminated product water, and make the lost of life of film.
Preventing the method for fouling membrane at present is, 1) each series bactericidal agent is added in pretreatment to prevent the growth of microorganism,
2) antisludging agent is added to alleviate the fouling of all kinds of inorganic matters, 3) when membrane flux is reduced, removed and be attached to the cleaning method of film
Film surface is difficult to cleaning deposit and microorganism.The cleaning method of wherein film has two kinds of physical method and chemical method, wherein thing
Reason method such as hydraulics cleaning method is only applicable to microfiltration membranes and loose milipore filter, in most cases still needs to Chemical cleaning,
Film was used after certain time, need to add various chemical agents and the dirt in film is cleaned.After cleaning, although in short-term
The interior recovery to membrane flux has certain effect, but also brings secondary pollution simultaneously, and film is caused to a certain degree in itself
Infringement, cause the final cleaning frequency shorter and shorter, directly shorten the service life of film.Therefore, the service life of film is general
It it is only at most 5 years, the economy of film constrains the large-scale use of film and its performance of premium properties.While bactericide, scale inhibition
Agent, cleaning agent, a large amount of use of bronsted lowry acids and bases bronsted lowry also further increase operating cost.By taking desalinization as an example, current common process
Need to add the operation that ten several chemical agents carry out diaphragm.
Reverse osmosis membrane, NF membrane have different structure types, including hollow fiber form, rolling, plate and frame and tubular type.At present
Hollow fiber form is most ripe structure type, is also what is be most widely used.Hollow fiber form reverse osmosis membrane, NF membrane are from film
It is due to be limited by asymmetric membrane structure although outside can withstand up to 4MPa-8MPa operating pressure to film inner side
System, back pressure phenomenon can cause diaphragm by physical damnification.For current all commercial hollow fiber form reverse osmosis membranes, NF membrane
Specification is required to production water side (on the inside of film) pressure must not be higher than feedwater side (on the outside of film) pressure 0.05Mpa.Therefore, currently without
Any research for reversely washing technology on milipore filter, reverse osmosis membrane.
For example, Chinese patent CN201521116300 reports a kind of offline cleaning of the addition chemical agent of automation
Method, substantially belongs to offline cleaning.Chinese patent CN201210295481.4. reports a kind of on-line cleaning membrane separation assemblies
Electroplating wastewater system and its technique, the technique is only applicable to immersion separating film module, with nanofiltration involved in the present invention, anti-
Permeable membrane is not a kind of membrane module of structure type.The self-cleaning film process that Chinese patent CN103265095A is used for water process is filled
Put, this method is cleaned using back pressure technology is counter to milipore filter.It is not suitable for hollow fiber form nanofiltration, reverse osmosis membrane.
The content of the invention
In order to overcome the shortcoming of above-mentioned prior art, it is an object of the invention to provide a kind of nanofiltration, the height of reverse osmosis membrane
The online reverse cleaning method and device of osmotic pressure, for serious, the traditional Chemical cleaning of the fouling membrane in application of membrane separation technology
There are problems that secondary pollution and cleaning, according to penetration theory, when membranous system is run, by the osmotic pressure for changing raw water
With the operating pressure of film so that production water (penetrating fluid) is reversed " sucking back " to membranous system in the presence of concentrated water osmotic pressure, and with
Strong brine discharges membranous system together, realizes and carries out reverse cleaning to film.During the reverse cleaning of the present invention, high-pressure pump does not have
It is stopped, reverse osmosis membrane is still operated in barotropic state, will not occurs " back pressure ".The present invention has reduction film surface scale speed
Rate and fouling adhesive force, kill film surface bacteria, the effect for preventing colloidal solid from depositing, so that the speed of fouling membrane is reduced, it is real
The explosive filling free operation and explosive filling free cleaning of film are showed.
To achieve these goals, the technical solution adopted by the present invention is：
A kind of nanofiltration, the online reverse cleaning method of hyperosmosis of reverse osmosis membrane, comprise the following steps：
A) startup of online reverse cleaning：Run within continuous 24 hours such as counter-infiltration system, start once clean daily；As instead
Osmosis system discontinuous operation, is cleaned before each shutdown；
B) preparation of online reverse cleaning：In counter-infiltration system production process, the strong brine that counter-infiltration is produced is carried out
It is collected into strong brine tank, its volume is the strong brine volume produced by counter-infiltration is normally produced 30 minutes；Meanwhile, by counter-infiltration
The production water of production is collected into reverse cleaning water pot, and its volume should be greater than the production produced by counter-infiltration system is normally produced 15 minutes
Water volume.The height of reverse cleaning water pot should be more than 1 meter on nanofiltration, reverse osmosis membrane pressure vessel top.
C) startup of online reverse cleaning：High-pressure pump operating pressure is reduced to by the pressure P1 under counter-infiltration operating mode anti-clear
Pressure P4 is washed, stable in constant pressure, the slow counterbalance valve for opening brine outlet is to full-gear, by the strong brine in strong brine tank
Send into film, simultaneously close off raw water water inlet and production water water outlet, in the case where strong brine osmotic pressure must drive, the production water of reverse cleaning water pot
Opposite direction flows to the outside of film, is discharged in the lump from film with strong brine；
D) online reverse cleaning：Maintain pressure constant state constant, until the strong brine water level collected enters low liquid level.As occurred
When producing water water level into low liquid level state, reverse cleaning process should be interrupted immediately；
E) raw water is cleaned：Raw water water intaking valve and production water outlet valve are opened, until strong brine side electrical conductivity and influent side conductance
Rate is consistent；
F) cleaning terminates：Adjusting high-pressure pump flow of inlet water, makes it consistent with normal counter-infiltration working condition flow, slowly
Close the counterbalance valve of brine outlet.Stop when lateral pressure of intaking is equal to counter-infiltration operating pressure, system returns to counter-infiltration
Operating mode, normally produces water.
During pressure condition：
A) under normal counter-infiltration operating mode, the osmotic pressure P2 of raw water, high-pressure pump operating pressure is P1, production water (penetrating fluid) pressure
Power is P5, and the osmotic pressure of penetrating fluid is very low, ignores.Now on the inside of film (penetrating fluid) between outside pressure difference Λ p1=P1-
P2–P5；
B) under online reverse cleaning operating mode, high-pressure pump operating pressure is P4, and the flow of inlet water of film is to enter under counter-infiltration operating mode
2 times of water-carrying capacity, due to counterbalance valve standard-sized sheet, now P4 is less than P1 and the osmotic pressure P3 of strong brine；
C) under online reverse condition, penetrating fluid (production water) pressure is P6 on the inside of film, now (penetrating fluid) and outside on the inside of film
Pressure difference Λ p2=P3+P6-P4, wherein Λ p2 direction is opposite with Λ p1.Λ p2 are less than the 60% of Λ p1, and more than 1Mpa.
According to penetration theory, penetrating fluid (production water) flows out of film on the outside of lateral film, is discharged with strong brine from film.
If the osmotic pressure of the strong brine produced in reverse osmosis process is insufficient for the pressure condition, clear every time
Before washing, sodium chloride is delivered in strong brine, makes its osmotic pressure to meet requirement.
, wherein it is desired to it is to be noted that：
1st, in the design process, Λ p2 theoretical values are carefully calculated.Λ p2 hypertonia can cause to produce water-carrying capacity mistake
Greatly, reverse osmosis membrane is damaged.Λ p2 are too low, and the production water-carrying capacity that can be is too low, does not reach cleaning performance.Particularly in water inlet water temperature
In the big system of change, the rate of recovery of water temperature meeting significant impact film, thus bring the change of the osmotic pressure of strong brine.
2nd, during the regulation of valve and high-pressure pump, governing speed answers the specification of reference membrane, it is to avoid media variations and
The impact that high pressure pump pressure acute variation is caused to film.
3rd, under normal counter-infiltration operating mode, under cleaning operating mode and in the handoff procedure of operating mode, it is ensured that penetrating fluid is full of film
Inner side.
Present invention also offers a kind of online reverse cleaning device of the hyperosmosis of nanofiltration, reverse osmosis membrane, including：
Strong brine stocking system, including strong brine tank 5, water inlet and nanofiltration, the reverse osmosis membrane pressure vessel of strong brine tank 5
13 strong brine outlet pipe 15 connects and strong brine pressure reducing orifice 12 is provided with connecting line and strong brine tank water intaking valve 11,
The delivery port of strong brine tank 5 connects reverse osmosis high-pressure intake pump 10 and strong brine tank outlet valve 4, pressure is provided with connecting line
Power meter 7, conductivity sensor 38 and feed water flow gauge 9；
Reverse cleaning water stocking system, including reverse cleaning water pot 18, reverse cleaning water pot 18 are connected in parallel on nanofiltration, counter-infiltration
In the water production pipeline 21 of membrane pressure vessel 13, the bottom position of reverse cleaning water pot 18 is higher than nanofiltration, reverse osmosis membrane pressure vessel 13
Production water water intaking valve 17 is set in more than 1 meter of top, the water influent pipeline of reverse cleaning water pot 18, and drain pipe sets check valve on road
19, when the pressure of water production pipeline 21 is less than 18 minimum liquid level pressure of reverse cleaning water pot, check valve 19 is beaten under gravity
Open；
Back pressure adjusting system, including it is arranged on nanofiltration, the electricity on the strong brine outlet pipe 15 of reverse osmosis membrane pressure vessel 13
Conductivity sensor 1 and counterbalance valve 16, conductivity sensor 1 and counterbalance valve 16 are arranged on after the water inlet of strong brine tank 5
Side.
Conductivity sensor 2 26 is provided with the strong brine tank 5, strong brine tank 5 is connected with band sodium chloride dosing valve 6
Chemical feed pipe.
In the nanofiltration, the raw water inlet pipeline of reverse osmosis membrane pressure vessel 13, between water intaking valve 3 and water inlet, according to
It is secondary to be provided with pressure gauge 7, conductivity sensor 38, feed water flow gauge 9 and reverse osmosis high-pressure intake pump 10, strong brine tank water outlet
Valve 4 is connected in parallel between water intaking valve 3 and pressure gauge 7, and the delivery port of reverse osmosis high-pressure intake pump 10 is connected in parallel to strong brine tank 5
Water inlet, and it is provided with connecting line pressure gauge 2 23 and flowmeter 2 24.
The volume of the strong brine tank 5 is 30 minutes strong brine yield of system, and the volume of reverse cleaning water pot 18 is more than instead
Permeate the operating mode production aquatic products amount of lower 15 minutes.
In water production pipeline 21, positioned at the rear of check valve 19, production taps valve 20 is provided with.
Compared with prior art, the beneficial effects of the invention are as follows：
1st, byproduct-strong brine that this method is produced using nanofiltration, reverse osmosis process carries out physical cleaning, without addition
Chemicals, saves a large amount of medicament expenses, administration fee, labour cost.The aging and damage for avoiding medicine cleaning from carrying out film strips, greatly
Extend the life-span of film.The invention is a kind of low-carbon, environmental protection, the method for energy-conservation.
2nd, conventional chemical CIP on-line cleanings, cleaning water (flow) direction is consistent with normal counter-infiltration production process current direction, nothing
Method removes more close, the firm impurity adhered on film.The present invention uses reverse cleaning, and production water is in the case where osmotic pressure must be acted on
From the flowing of film Inside To Outside, it is effective remove the inorganic ions being clipped in the middle of reverse osmosis membrane, bacterium, virus, organic matter and
The impurity such as colloid.
3rd, because production water is very pure, the solubility to difficulty soluble salt is far above the solubility of raw water, and therefore, reverse cleaning can
Effectively to dissolve difficulty soluble salt, higher film surface velocity is added, difficulty soluble salt can rapidly dissolve and discharge membranous system.
4th, according to the specification requirement of current NF membrane and reverse osmosis membrane, membranous system is started to normally from dead halt state
Production status needs 30 minutes to 1 hours to make to be completely filled with liquid inside film.Likewise, from normal production to dead halt
The 30 minutes time to 1 hour is needed to empty the strong brine inside film.Therefore, primary chemical cleaning is carried out or offline clear
The time of several days need to be taken hours by washing.And in this patent, reverse cleaning operating mode is transferred to from counter-infiltration production status, until clear
Wash the whole cleaning process film surface for terminating to resume production has liquid to flow through all the time, and high-pressure pump does not interrupt, membranous system one
It is straight in running order, complete operating mode by automatically controlling and switch, exit reverse cleaning process from entering and only need 20 minutes
Left and right.Therefore this patent greatly extends the effective time of counter-infiltration system, and economic benefit is clearly.
5th, because chemical CIP cleanings are time-consuming long, it is typically only capable to cleaning some months once.The reverse cleaning that the present invention is used
Speed it is fast, automaticity is high, can clean daily once.Film surface long term can be made to keep cleaning, can be removed from raw water
In add antisludging agent, improve the flux of film, reduce the operating pressure of film, realize NF membrane, the explosive filling free fortune of reverse osmosis membrane
OK.
6th, the reproduction speed of microorganism exceedes any biology, and general bacterium can divide once (generation) in about every 20 minutes, press
This speed is calculated, and a cell can breed about 2,000,000 through 7h.Microbial cell living environment is by by temperature, osmotic pressure
Etc. the influence of extraneous factor.And the microorganism of film surface attachment can be good at adapting to the hyperosmosis environment of raw water.Produce water
Osmotic pressure is far below the osmotic pressure of raw water, and shrinkage or swelling, rupture can occur immediately in Hyposmolality for bacterial cell.Therefore,
It is much better than chemical CIP cleanings to the inhibition of microorganism pollution for the present invention.
7th, by the conductivity variations to the strong brine produced by reverse cleaning, with reference to the film in reverse osmosis process after cleaning
Inside and outside side pressure difference is analyzed, and situation and cleaning performance are blocked up in the dirt that can effectively assess film.Appraisal procedure is simple, side
Just, and it can record automatically.Further, by the chemical composition of the interlude strong brine to being discharged during reverse cleaning with it is dense
The chemical composition comparative analysis of strong brine in brine tank, can carry out rationally effective comment to type, the order of severity of fouling membrane
Estimate.
Brief description of the drawings
Fig. 1 is cleaning device structural representation of the present invention.
Fig. 2 is pressure condition schematic diagram of the present invention.
Embodiment
Describe embodiments of the present invention in detail with reference to the accompanying drawings and examples.
As shown in figure 1, present invention also offers a kind of online reverse cleaning device of the hyperosmosis of nanofiltration, reverse osmosis membrane,
Including：
Strong brine stocking system, including strong brine tank 5, water inlet and nanofiltration, the reverse osmosis membrane pressure vessel of strong brine tank 5
13 strong brine outlet pipe 15 connects and strong brine pressure reducing orifice 12 is provided with connecting line and strong brine tank water intaking valve 11,
The delivery port of strong brine tank 5 is connected to pressure gauge 7, conductivity sensor 38, feed water flow gauge 9 and reverse osmosis high-pressure intake pump
Strong brine tank outlet valve 4 is provided with before 10, and on connecting line；
Reverse cleaning water stocking system, including reverse cleaning water pot 18, produce the height of water storage tank 18 in nanofiltration, reverse osmosis membrane
More than 1 meter of 13 top of pressure vessel.Reverse cleaning water pot 18 is connected in parallel on nanofiltration, the water production pipeline 21 of reverse osmosis membrane pressure vessel 13
On, set in the water influent pipeline of reverse cleaning water pot 18 and check valve 19 is set on production water water intaking valve 17, drain pipe road；
Back pressure adjusting system, including it is arranged on nanofiltration, the electricity on the strong brine outlet pipe 15 of reverse osmosis membrane pressure vessel 13
Conductivity sensor 1 and counterbalance valve 16, conductivity sensor 14 and counterbalance valve 15 are arranged on the rear of the water inlet of strong brine tank 5.
The osmotic pressure of the strong brine produced such as counter-infiltration system, then can be in institute it is impossible to meet the requirement of reverse cleaning
State and conductivity sensor 2 26 is added with strong brine tank 5, strong brine tank 5 is connected with the chemical feed pipe with sodium chloride dosing valve 6.
In nanofiltration, the raw water inlet pipeline of reverse osmosis membrane pressure vessel 13, between water intaking valve 3 and water inlet, set successively
It is equipped with pressure gauge 7, conductivity sensor 38, feed water flow gauge 9 and reverse osmosis high-pressure intake pump 10, high-pressure water inlet pump 10 goes out
The mouth of a river is connected in parallel to the water inlet of strong brine tank 5, and is provided with connecting line pressure gauge 2 23 and flowmeter 2 24.
Strong brine tank volume is the strong brine yield of generation in 30 minutes in normal reverse osmosis process.Reverse cleaning water pot 18 holds
Product should be greater than the counter-infiltration operating mode production water aquatic products water of lower 15 minutes.The height of reverse cleaning water pot 18 is in nanofiltration, reverse osmosis membrane
More than 1 meter of 13 top of pressure vessel.
In water production pipeline 21, positioned at the rear of check valve 19, production taps valve 20 is provided with.
In device, the process of normal reverse osmosis produced water and current reverse osmosis process process indifference, the water inlet of strong brine tank
Valve 11, production water water intaking valve 17 are remained turned-off, and production taps valve 20 keeps standard-sized sheet, the regulation strong brine of counterbalance valve 16 side back pressure, it is ensured that
Required back pressure and system rate of recovery during reverse osmosis membrane normal work.Run within continuous 24 hours such as counter-infiltration system, the program should be every
24 hours once.Such as counter-infiltration system discontinuous operation, it should be cleaned before each shutdown.The cleaning that this law invention is provided
Method specifically includes following steps：
A) preparation of online reverse cleaning：In counter-infiltration system production process, strong brine tank water intaking valve 11 is opened, will be anti-
The strong brine that infiltration is produced is collected into strong brine tank 5.After strong brine tank 5 is filled, strong brine tank water intaking valve 11 is closed.Together
When, production water water intaking valve 17 is opened, the production water that counter-infiltration is produced is collected into reverse cleaning water pot 18, reverse cleaning water pot 18 is filled
Man Hou, closes production water water intaking valve 17.Now preparation is finished.
B) startup of online reverse cleaning：Pressure P1 of the reverse osmosis high-pressure intake pump 10 under counter-infiltration operating mode is reduced to
Anti- cleaning pressure P4 set in advance, makes reverse osmosis high-pressure intake pump 10 be operated in pressure constant state.The now pressure of high-pressure pump 10
P4 is much smaller than and raw water osmotic pressure P2, therefore production water produces process and tapered off as the pressure of pressure high-pressure pump 10 declines, and produces water
The pressure P5 of side (water production pipeline 22) is gradually reduced naturally.When static pressures of the pressure P5 less than the production water in reverse cleaning water pot 18
When, check valve 19 is opened, and production water is outwards flowed by reverse cleaning water pot 18.It is slow to open the back of the body after after the pressure stability of high-pressure pump 10
Pressure valve 16 arrives full-gear, simultaneously closes off production taps valve 20.With the opening of counterbalance valve, resistance to water-flow is dropped rapidly on the outside of putamina
Low, raw water flow rapidly rises to 2 times of counter-infiltration operating mode.Slow strong brine tank outlet valve 4 of opening arrives standard-sized sheet again, simultaneously closes off
The water intaking valve 3 of Yuan Shui sides.The now water inlet of reverse osmosis membrane by raw water be switched to osmotic pressure on the outside of strong brine, corresponding film also by
P2 originally increases to P3, and now the pressure of high-pressure water inlet pump 10 then maintains that P4 is constant, and system enters online reverse cleaning shape
State.According to osmosis principle, the side (inner side) that producing the production water of water side (water production pipeline 22) can force down from infiltration is reverse flowed to
Strong brine side (outside) flowing of the high side form of osmotic pressure, and strong brine flow out together.
C) online reverse cleaning：Maintain reverse osmosis high-pressure 10 default constant pressure P4 states of intake pump constant, until strong brine
The water level of tank 5 enters low liquid level.
D) source water is cleaned：Water intaking valve 3 and production taps valve 20 are opened, until the conductivity sensor 1 of strong brine side is surveyed
Terminate after the electrical conductivity of amount is consistent with the electrical conductivity that the conductivity sensor 38 of influent side is measured.
E) cleaning terminates：Open production taps valve 20.The flow of regulation reverse osmosis high-pressure intake pump 10 is to counter-infiltration afterwards
The flow of working condition, it is then slow to adjust counterbalance valve 16.Stop adjusting when lateral pressure of intaking is equal to counter-infiltration operating pressure P1
The aperture of counterbalance valve 16 is saved, system returns to counter-infiltration operating mode.
Wherein, reference picture 2, the pressure difference of film inner and outer should meet following condition：
A) under normal counter-infiltration operating mode, during reverse osmosis produced water, the osmotic pressure P2 of source water, reverse osmosis high-pressure intake pump
10 operating pressures are P1, and infiltration hydraulic coupling is P5.Now (penetrating fluid) pressure difference Λ p1=P1-P2-P5 between outside on the inside of film.
B) under backwash operating mode, the operating pressure of reverse osmosis high-pressure intake pump 10 is that P4 should be guaranteed that the flow of inlet water of film is anti-
Permeate flow of inlet water under operating mode 2 times.Because the strong brine counterbalance valve of now reverse osmosis membrane is standard-sized sheet, so P4 values should be less than P1
Value and P2 values.
C) under backwash operating mode, the operating pressure of reverse osmosis high-pressure intake pump 10 is P4, and infiltration hydraulic coupling is P6.Now in film
Side and the pressure difference Λ p2=P3+P6-P4 in outside.Wherein Λ p2 should be less than the 60% of Λ p1, and more than 1Mpa.
If the osmotic pressure of the strong brine d) produced in reverse osmosis process is insufficient for the condition of above calculating, Ke Yi
Before each backwash, sodium chloride is delivered in strong brine tank, its osmotic pressure is met design requirement.
, wherein it is desired to it is specifically intended that：
1st, in the design process, Λ p2 theoretical values are carefully calculated.Driving pressure Λ p2 are too high to be caused to produce current
Amount is excessive, damages reverse osmosis membrane.Driving pressure Λ p2 are too low, can make it that production water reverse cleaning flow is too low, not reach cleaning effect
Really.Change especially for water inlet water temperature in system greatly, the rate of recovery of the change meeting significant impact film of water temperature, thus bring
The change of the osmotic pressure and driving pressure Λ p2 of strong brine.
2nd, during the regulation of valve and high-pressure pump, governing speed answers the specification of reference membrane, it is to avoid media variations and
The impact that high pressure pump pressure acute variation is caused to film.
3rd, whenever, it is necessary to ensure the production water side (water production pipeline 22) of film full of production water.
The following is the concrete application example of the present invention.
By taking 50 ton day reverse osmosis seawater desalting counter-infiltration systems as an example, flow of inlet water is 4.62 ton hours, and the rate of recovery is
When 45%, used medium is Copenhagen water, and source water penetration pressure about P2 is 2.4Mpa, strong brine osmotic pressure P3=4.6Mpa, reverse osmosis
High-pressure pump operating pressure P1=5.5Mpa under saturating operating mode, infiltration hydraulic coupling P5=0.003MPa.
Under reverse cleaning operating mode, high-pressure pump operating pressure P4=3.2Mpa, penetrating fluid flow by gravity produce static pressure be
P6=0.001Mpa.Therefore ,-the 0.003=3.097Mpa of Λ p1=P1-P2-P5=5.5-2.4
Λ p2=P3+P6-P4=4.6+0.001-3.2=1.401MPa
Λ p2 are less than the 60% of P1 and more than 1MPa.
In the winter time, if causing the system rate of recovery to be reduced to 30% because raw water water temperature is reduced, now produced strong brine
Osmotic pressure P3=2.7Mpa, now：
Λ p2=P3+P6-P4=2.7+0.001-2.5=0.2001Mpa, now because the osmotic pressure of strong brine is to omit
Higher than high-pressure pump operating pressure P3, the driving pressure Λ p2 of production water only have 0.2001MPa<1MPa.Driving pressure Λ p2 deficiency meetings
Cause production water reverse cleaning flow too low, do not reach cleaning performance.The method that can now select is added into strong brine tank
Sodium chloride electrolysis matter, improves the osmotic pressure of strong brine, carries the flow velocity of high yield water reverse cleaning.
Claims (9)
1. a kind of nanofiltration, the online reverse cleaning method of the hyperosmosis of reverse osmosis membrane, it is characterised in that produced using counter-infiltration
Concentrated water has the characteristic of hyperosmosis, and the production water on the inside of film is reversely sucked back into strong brine side i.e. on the outside of film, and discharges membranous system,
The online reverse cleaning of complete pair of films, comprises the following steps：
A) startup of online reverse cleaning：Run within continuous 24 hours such as counter-infiltration system, start once clean daily；Such as counter-infiltration
System discontinuous operation, is cleaned before each shutdown；
B) preparation of online reverse cleaning：In counter-infiltration system production process, the strong brine that counter-infiltration is produced is stored in dense salt
In water pot, strong brine tank volume is the strong brine yield of generation in 30 minutes in normal reverse osmosis process；Meanwhile, counter-infiltration is produced
Production water collect in reverse cleaning water pot, reverse cleaning water pot storage the counter-infiltration operating mode aquifer yield of lower 15 minutes；It is reversely clear
Wash water pot bottom position is higher than nanofiltration, reverse osmosis membrane pressure vessel top more than 1 meter, and is connected by check valve with water production pipeline
Connect, in counter-infiltration production process, closed check valve, when water production pipeline pressure is less than reverse cleaning water pot minimum liquid level pressure
When, check valve is opened；
C) startup of online reverse cleaning：The high-pressure pump operating pressure of counter-infiltration system is dropped by the pressure P1 under counter-infiltration operating mode
It is low to arrive anti-cleaning pressure P4, and maintain constant pressure, the slow counterbalance valve for opening brine outlet to full-gear, now strong brine
Flow velocity is more than 2 times of normal counter-infiltration raw water flow velocity, and the strong brine of collection is sent into membranous system；Simultaneously close off raw water water inlet and
Production water in production water water outlet, reverse cleaning water pot is reversed in the presence of concentrated water osmotic pressure is sucked back into membranous system, and with dense salt
Water discharges membranous system together, it is achieved thereby that the online direction cleaning of NF membrane, reverse osmosis membrane；
D) online reverse cleaning：Maintain pressure constant state constant, until the strong brine water level collected enters low liquid level；
E) raw water is cleaned：Strong brine tank and reverse cleaning water pot outlet valve are closed, and opens raw water water inlet and production water water outlet simultaneously
Valve, until strong brine side electrical conductivity is consistent with influent side electrical conductivity；
F) reverse cleaning terminates：Flow of inlet water is consistent with counter-infiltration working condition flow, and high-pressure pump enters constant current state, slowly
The counterbalance valve of brine outlet is closed, is stopped when lateral pressure of intaking is equal to counter-infiltration operating pressure, system recovers counter-infiltration work
Condition.
2. nanofiltration, the online reverse cleaning method of hyperosmosis of reverse osmosis membrane according to claim 1, it is characterised in that film
The condition of inner and outer pressure differential：
A) under normal counter-infiltration operating mode, during reverse osmosis produced water, the osmotic pressure P2 of raw water, high-pressure pump operating pressure is P1,
Production water pressure is P5 on the inside of film, and by adjusting counterbalance valve, raw water overcomes osmotic pressure P2 in the presence of high pressure pump pressure P1, raw
Output produces water, now pressure difference Λ p1=P1-P2-P5 between film outside and film inner side；
B) under reverse cleaning operating mode, the strong brine counterbalance valve of reverse osmosis membrane is opened completely, and the flow of inlet water of film is counter-infiltration work
More than 2 times of flow of inlet water under condition, high-pressure pump operating pressure be P4, now high-pressure pump be mainly used in maintain film flow of inlet water with
Increase the flow velocity on film surface, therefore, P4 is less than P1；
C) under reverse cleaning operating mode, production water pressure is P6 on the inside of film, and production water penetration pressure in production water side is almost 0, is ignored, this
When film on the inside of and film on the outside of between pressure difference Λ p2=P3+P6-P4, wherein Λ p2 are less than the 60% of Λ p1, and more than 1Mpa.
3. nanofiltration, the online reverse cleaning method of hyperosmosis of reverse osmosis membrane according to claim 2, it is characterised in that such as
The osmotic pressure of the strong brine produced in fruit reverse osmosis process is insufficient for the pressure condition, then before each cleaning,
Sodium chloride is delivered in strong brine, makes its osmotic pressure to meet requirement.
4. nanofiltration, the online reverse cleaning method of hyperosmosis of reverse osmosis membrane according to claim 1, it is characterised in that
Under normal counter-infiltration operating mode, under cleaning operating mode and in the handoff procedure of operating mode, it is ensured that penetrating fluid is full of the inside of film.
5. a kind of nanofiltration, the online reverse cleaning device of the hyperosmosis of reverse osmosis membrane, it is characterised in that including：
Strong brine stocking system, including strong brine tank (5), water inlet and nanofiltration, the reverse osmosis membrane pressure vessel of strong brine tank (5)
(13) strong brine outlet pipe (15) connection and strong brine pressure reducing orifice (12) is provided with connecting line and strong brine tank enters
Water valve (11), the delivery port of strong brine tank (5) connects reverse osmosis high-pressure intake pump (10) and dense salt is provided with connecting line
Water pot outlet valve (4), pressure gauge (7), conductivity sensor three (8) and feed water flow gauge (9)；
Reverse cleaning water stocking system, including reverse cleaning water pot (18), reverse cleaning water pot (18) are connected in parallel on nanofiltration, counter-infiltration
In the water production pipeline (21) of membrane pressure vessel (13), reverse cleaning water pot (18) bottom position is higher than nanofiltration, reverse osmosis membrane pressure
Set in more than 1 meter of container (13) top, the water influent pipeline of reverse cleaning water pot (18) on production water water intaking valve (17), drain pipe road
Check valve (19) is set, when water production pipeline (21) pressure is less than reverse cleaning water pot (18) minimum liquid level pressure, check valve
(19) open under gravity；
Back pressure adjusting system, including it is arranged on nanofiltration, the electricity on the strong brine outlet pipe (15) of reverse osmosis membrane pressure vessel (13)
Conductivity sensor one (14) and counterbalance valve (16), conductivity sensor one (14) and counterbalance valve (16) are arranged on strong brine tank (5)
The rear of water inlet.
6. nanofiltration, the online reverse cleaning device of hyperosmosis of reverse osmosis membrane according to claim 5, it is characterised in that institute
State and conductivity sensor two (26) is provided with strong brine tank (5), strong brine tank (5) is connected with sodium chloride dosing valve (6)
Chemical feed pipe.
7. nanofiltration, the online reverse cleaning device of hyperosmosis of reverse osmosis membrane according to claim 5, it is characterised in that institute
State nanofiltration, on the raw water inlet pipeline of reverse osmosis membrane pressure vessel (13), in water intaking valve (3) between water inlet, set gradually
There are pressure gauge (7), conductivity sensor three (8), feed water flow gauge (9) and reverse osmosis high-pressure intake pump (10), strong brine tank goes out
Water valve (4) is connected in parallel between water intaking valve (3) and pressure gauge (7), and the delivery port of reverse osmosis high-pressure intake pump (10) is connected in parallel to
The water inlet of strong brine tank (5), and it is provided with connecting line pressure gauge two (23) and flowmeter two (24).
8. nanofiltration, the online reverse cleaning device of hyperosmosis of reverse osmosis membrane according to claim 5, it is characterised in that institute
The volume for stating strong brine tank (5) is 30 minutes strong brine yield of system, and the volume of reverse cleaning water pot (18) is more than counter-infiltration work
The condition production aquatic products amount of lower 15 minutes.
9. nanofiltration, the online reverse cleaning device of hyperosmosis of reverse osmosis membrane according to claim 5, it is characterised in that
In water production pipeline (21), the rear positioned at check valve (19) is provided with production taps valve (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710702705.1A CN107321186B (en) | 2017-08-16 | 2017-08-16 | A kind of nanofiltration, the online reverse cleaning method and device of the hyperosmosis of reverse osmosis membrane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710702705.1A CN107321186B (en) | 2017-08-16 | 2017-08-16 | A kind of nanofiltration, the online reverse cleaning method and device of the hyperosmosis of reverse osmosis membrane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107321186A true CN107321186A (en) | 2017-11-07 |
| CN107321186B CN107321186B (en) | 2018-04-13 |
Family
ID=60201028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710702705.1A Active CN107321186B (en) | 2017-08-16 | 2017-08-16 | A kind of nanofiltration, the online reverse cleaning method and device of the hyperosmosis of reverse osmosis membrane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107321186B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108117134A (en) * | 2018-01-11 | 2018-06-05 | 北京鑫佰利科技发展有限公司 | A kind of membrane processing method of strong brine continuous concentration decrement |
| CN108722195A (en) * | 2018-06-05 | 2018-11-02 | 北京海川新源环保科技有限公司 | A kind of the explosive filling free on-line cleaning method and device of counter-infiltration system |
| CN108786475A (en) * | 2018-06-28 | 2018-11-13 | 北京海川新源环保科技有限公司 | A kind of ultrasonic wave of NF membrane reverse osmosis membrane is just permeating on-line cleaning method and device |
| CN110102188A (en) * | 2018-04-27 | 2019-08-09 | 轻工业环境保护研究所 | Concentrated water electrocatalytic oxidation permeates cleaning reverse osmosis/nanofiltration membrane method and device online |
| CN110102187A (en) * | 2018-04-27 | 2019-08-09 | 轻工业环境保护研究所 | The method and device of concentrated water catalytic ozonation on-line cleaning reverse osmosis/nanofiltration membrane |
| CN110975633A (en) * | 2019-12-23 | 2020-04-10 | 中国科学院青岛生物能源与过程研究所 | Osmotic membrane cleaning system based on osmotic pressure difference |
| CN112473374A (en) * | 2020-11-06 | 2021-03-12 | 张梅 | Semipermeable membrane desalination device and method with bidirectional forward osmosis online cleaning function |
| CN113149132A (en) * | 2021-03-25 | 2021-07-23 | 东北农业大学 | High-pressure reverse osmosis membrane filtration system capable of backwashing |
| CN113480106A (en) * | 2021-07-31 | 2021-10-08 | 浙江新睿环保科技有限公司 | Emulsion and workshop cleaning sewage treatment process and treatment equipment thereof |
| CN115999376A (en) * | 2023-03-20 | 2023-04-25 | 金科环境股份有限公司 | Reverse osmosis membrane cleaning method and device, electronic equipment and storage medium |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103265095B (en) * | 2013-05-16 | 2014-10-08 | 淮南矿业(集团)有限责任公司 | Self-cleaning membrane treatment device for water treatment |
| JP6305368B2 (en) * | 2015-03-31 | 2018-04-04 | 栗田工業株式会社 | Water treatment method and apparatus |
| CN105347440A (en) * | 2015-11-11 | 2016-02-24 | 天津市瑞德赛恩水业有限公司 | Backwashing system and process for filter membrane cleaning |
| CN105597549A (en) * | 2016-02-14 | 2016-05-25 | 大唐内蒙古多伦煤化工有限责任公司 | Device and method for cleaning nanofiltration membrane |
| CN105903355A (en) * | 2016-06-06 | 2016-08-31 | 上海知勉环境技术有限公司 | Method for preventing and treating pollution through reverse osmosis membrane or nano filter membrane system |
-
2017
- 2017-08-16 CN CN201710702705.1A patent/CN107321186B/en active Active
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108117134A (en) * | 2018-01-11 | 2018-06-05 | 北京鑫佰利科技发展有限公司 | A kind of membrane processing method of strong brine continuous concentration decrement |
| CN110102188A (en) * | 2018-04-27 | 2019-08-09 | 轻工业环境保护研究所 | Concentrated water electrocatalytic oxidation permeates cleaning reverse osmosis/nanofiltration membrane method and device online |
| CN110102187A (en) * | 2018-04-27 | 2019-08-09 | 轻工业环境保护研究所 | The method and device of concentrated water catalytic ozonation on-line cleaning reverse osmosis/nanofiltration membrane |
| CN108722195A (en) * | 2018-06-05 | 2018-11-02 | 北京海川新源环保科技有限公司 | A kind of the explosive filling free on-line cleaning method and device of counter-infiltration system |
| CN108786475A (en) * | 2018-06-28 | 2018-11-13 | 北京海川新源环保科技有限公司 | A kind of ultrasonic wave of NF membrane reverse osmosis membrane is just permeating on-line cleaning method and device |
| CN110975633A (en) * | 2019-12-23 | 2020-04-10 | 中国科学院青岛生物能源与过程研究所 | Osmotic membrane cleaning system based on osmotic pressure difference |
| CN110975633B (en) * | 2019-12-23 | 2022-12-30 | 中国科学院青岛生物能源与过程研究所 | Osmotic membrane cleaning system based on osmotic pressure difference |
| CN112473374A (en) * | 2020-11-06 | 2021-03-12 | 张梅 | Semipermeable membrane desalination device and method with bidirectional forward osmosis online cleaning function |
| CN113149132A (en) * | 2021-03-25 | 2021-07-23 | 东北农业大学 | High-pressure reverse osmosis membrane filtration system capable of backwashing |
| CN113480106A (en) * | 2021-07-31 | 2021-10-08 | 浙江新睿环保科技有限公司 | Emulsion and workshop cleaning sewage treatment process and treatment equipment thereof |
| CN115999376A (en) * | 2023-03-20 | 2023-04-25 | 金科环境股份有限公司 | Reverse osmosis membrane cleaning method and device, electronic equipment and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107321186B (en) | 2018-04-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107321186B (en) | A kind of nanofiltration, the online reverse cleaning method and device of the hyperosmosis of reverse osmosis membrane | |
| CN101786768B (en) | Forward osmosis membrane bioreactor | |
| CN1804618A (en) | Apparatus and method for testing and evaluating performance of medicament for water treatment with reverse osmosis membrane | |
| CN107486018B (en) | Nanofiltration-forward osmosis combined system adopting commercial nanofiltration membrane and forward osmosis membrane and application thereof | |
| CN103073133A (en) | Low-microbial-contamination wastewater deep recycling process | |
| CN102491564A (en) | Comprehensive recycling technology for mine water with high suspended matter content and high mineralization degree | |
| CN105903355A (en) | Method for preventing and treating pollution through reverse osmosis membrane or nano filter membrane system | |
| CN108722195A (en) | A kind of the explosive filling free on-line cleaning method and device of counter-infiltration system | |
| CN202430070U (en) | Heavy metal wastewater treatment and recycling equipment using two-membrane process | |
| CN205222857U (en) | Reverse osmosis container formula sea water desalination device | |
| CN210030227U (en) | Concentration treatment device for chemical nickel plating rinsing wastewater | |
| CN208104086U (en) | Liquid sofening treatment system is concentrated in landfill leachate | |
| CN112028270A (en) | Concentration treatment device and treatment method for chemical nickel plating rinsing wastewater | |
| CN203999057U (en) | The automatic back-washing device of ultra-filtration equipment in a kind of freight container seawater desalination system | |
| CN201245518Y (en) | Mobile integrated sewage dual membrane process sewage treating apparatus | |
| CN207130054U (en) | A kind of seawater filtering system | |
| CN206886868U (en) | Desalting water treatment device for surface water | |
| CN207002478U (en) | A kind of new DW system demineralized water system after improvement | |
| CN115159739A (en) | Reverse osmosis seawater desalination system | |
| CN211734053U (en) | Be used for iron oxide red waste water treatment to use device | |
| CN214243999U (en) | Rural drinking water nanofiltration water purification device | |
| CN205773684U (en) | A kind of ships sea water desalinating unit | |
| CN201506738U (en) | Efficient water-saving type film processing system | |
| CN204952681U (en) | Improved generation rubbish is washed and is swept automobile -used membrane separation device | |
| CN204981398U (en) | Integrated equipment that technology drainage of running water water factory was retrieved |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |