CN106336050B - A kind of process unit and method of demineralized water of high yield - Google Patents
A kind of process unit and method of demineralized water of high yield Download PDFInfo
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Abstract
A kind of process unit and method of demineralized water of high yield, belong to water treatment field.Water tank, pretreatment system, intermediate water tank, counter-infiltration system, electricity expel sub- film device and SDI value on-line control system before the process unit, including ultrafiltration；The process, comprising: (1) the reverse osmosis treatment scale of the device and electricity expel the treatment scale setting of sub- film device；(2) raw water enters pretreatment system；(3) pretreated water carries out reverse osmosis；(4) reverse osmosis concentrated water, which enters electricity and expels sub- film device, carries out desalting processing；(5) electricity drives ionic membrane production water and is detected by SDI value on-line control system, and when SDI≤3, electricity drives ionic membrane and produces the intermediate water tank that water returns to counter-infiltration system front end；The water tank before SDI > 3, the ultrafiltration of electricity drive ionic membrane production water return pretreatment system front end；The reverse osmosis yield of demineralized water can be improved in the technique, has the advantages that high system yield, energy conservation, operating cost be low and system energy long-term safety stable operation.
Description
Technical field
The present invention relates to a kind of water treatment field, the process unit of more specifically a kind of demineralized water of high yield and
Method.
Background technique
Reverse osmosis process has many advantages, such as that easy to operate, producing water water quality is stablized, and prepares market in a demineralized water at present
In occupy leading position.But since there are concentration polarization phenomenons, fouling membrane risk is higher, causes its producing water ratio lower, and general
50%~70% can be reached, cause great lot of water resources waste.Water resources shortage is serious, water-saving and emission-reducing policy pressure increasingly increases
It improves a demineralized water counter-infiltration system yield today added, for saving water resource, increases economic efficiency significant.
Currently, the method for improving a reverse osmosis yield of DW system demineralized water system is usually to use to increase reverse osmosis number of segment mode,
Reverse osmosis leading portion reverse osmosis concentrated water is further concentrated using next section.Yield is higher, and required increased number of segment is more.This
Kind mode will lead to following problem:
The first, as number of segment increases, feed water by reverse osmosis concentration is continuously increased, and the film due to caused by concentration polarization phenomenon is dirty
Dye risk increases rapidly, and number of segment is higher, and fouling membrane risk is bigger；
The second, due to the limitation of fouling membrane risk, increase number of segment and be extremely limited to promote the space of yield, system total recovery
Limiting value can only accomplish 75% or so.
Third, in order to avoid fouling membrane, need to be significantly increased the use of the medicaments such as reverse osmosis antisludging agent, fungicide, not only
Water producing cost is improved, and concentrated water secondary pollution is caused to aggravate.
In order to improve fouling membrane, while water yield is promoted, also had at present using high pressure disc tube reverse osmosis (dt-ro) (DTRO) technique,
Water yield can be improved to 80%-90%, but the process operating pressure is high, equipment investment is too big, and water producing cost is high, no
With promotional value.
Therefore, how low-risk, Low investment, low cost improve a demineralized water counter-infiltration system yield, for save water
Resource realizes that water-saving and emission-reducing is significant.
Summary of the invention
The too low problem of reverse osmosis yield of demineralized water preparation system of needle of the present invention proposes a kind of high yield and once removes
The reverse osmosis yield of demineralized water can be improved in the process unit and method of salt water, the technique, have high system yield, energy conservation,
The advantages of operating cost is low and the long-term safety stable operation of system energy.
A kind of process unit of demineralized water of high yield of the invention, including water tank, pretreatment system, centre before ultrafiltration
Water tank, counter-infiltration system, electricity expel sub- film device and SDI value on-line control system；
The pretreatment system is selected according to water quality；
The counter-infiltration system is one-part form, specifically includes high-pressure pump and RO film unit；High-pressure pump and RO film unit phase
Connection；
Water tank is connected with pretreatment system before ultrafiltration, and pretreatment system passes through the high pressure of intermediate water tank and counter-infiltration system
Pump is connected, and the RO film unit of counter-infiltration system expels sub- film device with electricity and is connected, and electricity expels sub- film device and existed by SDI value
Line control system is connected with water tank, intermediate water tank before ultrafiltration respectively.
The pretreatment system specifically includes quartz filter, active carbon filtering according to the water quality of a desalted water
Device and cartridge filter；Quartz filter is connected with active carbon filter, and active carbon filter is connected with cartridge filter
It connects.
The process of demineralized water of a kind of high yield of the invention, using above-mentioned process unit, comprising the following steps:
Step 1, the parameter setting of the process unit of demineralized water of high yield
The setting reverse osmosis treatment scale of the process unit of a demineralized water and the electric processing for expelling sub- film device in high yield
Scale；
Step 2, raw water enters pretreatment system by water tank before ultrafiltration, obtained pretreated water, wherein pretreated water
SDI value is less than 3；
Step 3, pretreated water enters the high pressure pump system of counter-infiltration system by intermediate water tank, is carried out by RO film unit
It is reverse osmosis, obtain a demineralized water and reverse osmosis concentrated water；
Step 4, reverse osmosis concentrated water drives the raw water of ionic membrane as electricity, is acted on by reverse osmosis concentrated water pressure into electricity and being expelled
Sub- film device, pressure are 0.15~0.25MPa, and reverse osmosis concentrated water expels sub- film device in electricity and carries out desalting processing, obtain electric drive
Ionic membrane concentrated water and electricity drive ionic membrane and produce water, and electricity drives the discharge of ionic membrane concentrated water；
Step 5, electricity drives ionic membrane production water and is detected by SDI value on-line control system, there is the following two kinds situation:
When SDI≤3, electricity drives ionic membrane and produces the intermediate water tank that water returns to counter-infiltration system front end, carries out reverse osmosis reprocessing,
Obtain a desalted water；
The water tank before SDI > 3, the ultrafiltration of electricity drive ionic membrane production water return pretreatment system front end, progress is reverse osmosis to be located again
Reason, obtains a desalted water.
In the step 1, the parameter setting of the process unit of demineralized water of high yield, the tool of relevant parameter
Body calculation method are as follows:
(1) the reverse osmosis treatment scale calculation method of the process unit of demineralized water of high yield are as follows:
The reverse osmosis receipts of a reverse osmosis treatment scale=time demineralized water yield ÷ of the process unit of a demineralized water in high yield
Rate；
Wherein, reverse osmosis yield is 50~60%, it is therefore an objective to reduce fouling membrane risk；
(2) in high yield in the process unit of a demineralized water, electricity expels the treatment scale calculation method of sub- film device are as follows:
Electricity expels the reverse osmosis treatment scale of the process unit of demineralized water for the treatment of scale=high yield for sub- film device
× (the reverse osmosis yield of 1-)=reverse osmosis concentrated water yield；
Electricity expels sub- film device water yield=(reverse osmosis treatment scale-original of the process unit of a demineralized water in high yield
Water process amount) ÷ electricity expels the treatment scale of sub- film device；
It is 80~90% that the electricity, which expels sub- film device water yield,；
The electricity expels sub- film device salt rejection rate not less than reverse osmosis yield.
In the step 4, described expels sub- film device into electricity by the effect of reverse osmosis concentrated water pressure, can save
Equipment investment and operating cost.
In the step 4, reverse osmosis concentrated water expels the mode that sub- film device carries out desalting processing in electricity, can be effective
Prevent fouling membrane.
In the step 4, reverse osmosis concentrated water expels the concrete mode that sub- film device carries out desalting processing in electricity are as follows:
(1) electricity expels sub- film device setting timing pole, and the frequency of falling pole is 15~60min/ times；
(2) electricity drives ionic membrane concentrated water pH value≤6；
(3) it when reverse osmosis concentrated water calcium ion and sulfate ion concentration product >=20000, then drives in ionic membrane concentrated water and adds to electricity
Enter antisludging agent, the amount of antisludging agent is added with electricity drive ionic membrane concentrated water volume and is calculated as (3-5) mg/L.
In the step 4 (1), the timing pole passes through the positive and negative anodes for changing the electrode that electricity expels sub- film device
Property is controlled.
In the step 4 (2), when electricity drives ionic membrane concentrated water pH value > 6, addition hydrochloric acid is adjusted；
In the step 4 (3), the antisludging agent be high molecular polymer, specially polyacrylic acid, poly or
The copolymer of polyacrylic acid and poly, molecular weight are 15000~20000 dalton.
Demineralized water process unit of a kind of high yield of the invention and method, compared with the prior art, its advantages
It is:
The first, it can effectively improve the reverse osmosis yield of DW system demineralized water system, system yield can achieve 90~95%, have
Effect saves water resource；
The second, it can effectively reduce the reverse osmosis and electric fouling membrane risk for expelling sub- film device, safeguards system long-term safety is steady
Fixed operation；
It is embodied in:
1. appropriate to reduce that counter-infiltration system yield, improving electricity, to expel sub- film process scale reverse osmosis to reduce according to water quality
The fouling membrane risk of sub- film device is expelled with electricity；
2. electricity expels sub- film device, by timing, pole and the control of concentrated water pH value prevent fouling membrane；
3. driving in ionic membrane concentrated water to electricity and adding antisludging agent, fouling membrane caused by calcium sulfate scaling is prevented；
Third, system operation cost are cheap, and expel sub- film device using increased electricity and take off to reverse osmosis concentrated water
Salt recovery processing has the characteristics that raising system handles yield, energy conservation and environmental protection；
4th, it can use reverse osmosis concentrated water pressure, recover energy, reduce water producing cost, ensure that the stability of system
And energy saving.
Detailed description of the invention
Fig. 1 is the process flow chart of demineralized water of high yield of the invention；
Wherein, water tank, 2- pretreatment system, 3- intermediate water tank, 4- counter-infiltration system, 4a- high-pressure pump, 4b- before 1- ultrafiltration
RO film unit, 5- electricity expel sub- film device, 6-SDI value on-line control system；
A- raw water, demineralized water of B-, C- reverse osmosis concentrated water, D- electricity drive ionic membrane concentrated water.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention is made below with reference to example
It is further described, but example is not as a limitation of the invention.
The process flow chart of a following embodiment demineralized water of high yield is shown in Fig. 1.
Embodiment 1
Situation explanation:
Certain steel comprehensive wastewater Recycling Project treatment scale is 1000m3/ h, processing target are to be prepared into waste water once to remove
Salt water supplies enterprise's production, it is desirable that improves a demineralized water yield as far as possible.According to water analysis, determine that a demineralized water yield is
90%, then a demineralized water yield is 900m3/h。
It is practical in conjunction with generating, a kind of process unit of demineralized water of high yield is present embodiments provided, including before ultrafiltration
Water tank 1, pretreatment system 2, intermediate water tank 3, counter-infiltration system 4, electricity expel sub- film device 5 and SDI value on-line control system 6；
The pretreatment system 2 specifically includes quartz filter, active carbon filtering according to the water quality of a desalted water
Device and cartridge filter；Quartz filter is connected with active carbon filter, and active carbon filter is connected with cartridge filter
It connects.
The counter-infiltration system 4 is one-part form, specifically includes high-pressure pump 4a and RO film unit 4b；High-pressure pump 4a and RO film
Unit 4b is connected；
Water tank 1 is connected with pretreatment system 2 before ultrafiltration, and pretreatment system 2 passes through intermediate water tank 3 and counter-infiltration system 4
High-pressure pump 4a be connected, the RO film unit 4b of counter-infiltration system 4 expels sub- film device 5 with electricity and is connected, electricity drive ionic membrane set
Standby 5 are connected with water tank 1, intermediate water tank 3 before ultrafiltration respectively by SDI value on-line control system 6.
A kind of process of demineralized water of high yield, using above-mentioned process unit, comprising the following steps:
Step 1, the parameter setting of the process unit of demineralized water of high yield
The process unit of a demineralized water in high yield, the circular of relevant parameter are as follows:
(1) the reverse osmosis treatment scale calculation method of the process unit of demineralized water of high yield are as follows:
The reverse osmosis receipts of a reverse osmosis treatment scale=time demineralized water yield ÷ of the process unit of a demineralized water in high yield
Rate；
Wherein, a demineralized water yield=900m3/h；Reverse osmosis yield is 60%；
By calculating, the reverse osmosis treatment scale of the process unit of a demineralized water is 1500m in high yield3/h；
(2) in high yield in the process unit of a demineralized water, electricity expels the treatment scale calculation method of sub- film device are as follows:
Electricity expels the reverse osmosis treatment scale of the process unit of demineralized water for the treatment of scale=high yield for sub- film device
× (the reverse osmosis yield of 1-)=reverse osmosis concentrated water yield；
Specially electric treatment scale=1500 × (the 1-60%)=600m for expelling sub- film device3/h；
Electricity expels sub- film device water yield=(reverse osmosis treatment scale-original of the process unit of a demineralized water in high yield
Water process amount) ÷ electricity expels the treatment scale of sub- film device；
Specially electricity expels sub- film device water yield=(1500-1000) ÷ 600=83.3, meets electricity and expels sub- film device
Water yield is 80~90% requirements；
The electricity expels sub- film device salt rejection rate greater than 60%；
Step 2, raw water A enters pretreatment system 2, obtained pretreated water by water tank 1 before ultrafiltration, wherein pretreatment
The SDI value of water is less than 3；
Step 3, pretreated water enters the high pressure pump system 4a of counter-infiltration system 4 by intermediate water tank 3, passes through RO film unit
4b progress is reverse osmosis, obtains demineralized water B and reverse osmosis concentrated water C；
Step 4, reverse osmosis concentrated water C drives the raw water of ionic membrane as electricity, is acted on by reverse osmosis concentrated water pressure and enters electric drive
Ion film device 5, pressure 0.25MPa, reverse osmosis concentrated water expel sub- film device 5 in electricity and carry out desalting processing, obtain 100m3/h
Electricity drives ionic membrane concentrated water D and 500m3/ h electricity drives ionic membrane and produces water, 100m3/ h electricity drives ionic membrane concentrated water D discharge；
Reverse osmosis concentrated water expels the concrete mode that sub- film device carries out desalting processing in electricity are as follows:
(1) electricity expels the positive-negative polarity that sub- film device expels the electrode of sub- film device by changing electricity, and timing pole is arranged,
The frequency of falling pole is 15min/ times；
(2) it is 5.5 that electricity, which drives ionic membrane concentrated water pH value,；
(3) reverse osmosis concentrated water calcium ion and sulfate ion concentration product are 15000；
Step 5, electricity drives ionic membrane production water and is detected by SDI value on-line control system, and SDI 3, electricity drives ionic membrane
The intermediate water tank 3 that water returns to 4 front end of counter-infiltration system is produced, reverse osmosis reprocessing is carried out, obtains a desalted water.
The system realizes a demineralized water yield 90%, and operating cost only has 2.2 yuan/ton of water, according to once removing
6 yuan of salt water price calculating, in year 2900 Yu Wanyuan of economic benefit, system payback periods only have 2 years or so.
Embodiment 2
Situation explanation:
Certain steel comprehensive wastewater Recycling Project treatment scale is 1000m3/ h, processing target are to be prepared into waste water once to remove
Salt water supplies enterprise's production, it is desirable that improves a demineralized water yield as far as possible.According to water analysis, determine that a demineralized water yield is
90%, then a demineralized water yield is 900m3/h。
Actually in conjunction with generation, a kind of process unit of demineralized water of high yield provided in this embodiment is the same as embodiment 1.
A kind of process of demineralized water of high yield, using above-mentioned process unit, comprising the following steps:
Step 1, the parameter setting of the process unit of demineralized water of high yield
The process unit of a demineralized water in high yield, the circular of relevant parameter are as follows:
(1) the reverse osmosis treatment scale calculation method of the process unit of demineralized water of high yield are as follows:
The reverse osmosis receipts of a reverse osmosis treatment scale=time demineralized water yield ÷ of the process unit of a demineralized water in high yield
Rate；
Wherein, a demineralized water yield=900m3/h；Reverse osmosis yield is 50%；
By calculating, the reverse osmosis treatment scale of the process unit of a demineralized water is 1800m in high yield3/h；
(2) in high yield in the process unit of a demineralized water, electricity expels the treatment scale calculation method of sub- film device are as follows:
Electricity expels the reverse osmosis treatment scale of the process unit of demineralized water for the treatment of scale=high yield for sub- film device
× (the reverse osmosis yield of 1-)=reverse osmosis concentrated water yield；
Specially electric treatment scale=1800 × (the 1-50%)=900m for expelling sub- film device3/h；
Electricity expels sub- film device water yield=(reverse osmosis treatment scale-original of the process unit of a demineralized water in high yield
Water process amount) ÷ electricity expels the treatment scale of sub- film device；
Specially electricity expels sub- film device water yield=(1800-1000) ÷ 900=88.9, meets electricity and expels sub- film device
Water yield is 80~90% requirements；
The electricity expels sub- film device salt rejection rate greater than 50%；
Step 2, raw water A enters pretreatment system 2, obtained pretreated water by water tank 1 before ultrafiltration, wherein pretreatment
The SDI value of water is less than 3；
Step 3, pretreated water enters the high pressure pump system 4a of counter-infiltration system 4 by intermediate water tank 3, passes through RO film unit
4b progress is reverse osmosis, obtains demineralized water B and reverse osmosis concentrated water C；
Step 4, reverse osmosis concentrated water C drives the raw water of ionic membrane as electricity, is acted on by reverse osmosis concentrated water pressure and enters electric drive
Ion film device 5, pressure 0.25MPa, reverse osmosis concentrated water expel sub- film device 5 in electricity and carry out desalting processing, obtain 100m3/h
Electricity drives ionic membrane concentrated water D and 500m3/ h electricity drives ionic membrane and produces water, 100m3/ h electricity drives ionic membrane concentrated water D discharge；
Reverse osmosis concentrated water expels the concrete mode that sub- film device carries out desalting processing in electricity are as follows:
(1) electricity expels the positive-negative polarity that sub- film device expels the electrode of sub- film device by changing electricity, and timing pole is arranged,
The frequency of falling pole is 60min/ times；
(2) it is 6 that electricity, which drives ionic membrane concentrated water pH value,；
(3) reverse osmosis concentrated water calcium ion and sulfate ion concentration product are 20000, drive to electricity and resistance is added in ionic membrane concentrated water
Dirty agent is added the amount of antisludging agent with electricity drive ionic membrane concentrated water volume and is calculated as 3mg/L；
Antisludging agent is polyacrylic acid, and molecular weight is 15000 dalton.
Step 5, electricity drives ionic membrane production water and is detected by SDI value on-line control system, and SDI 3.5, electricity expels son
Water tank 1 before the ultrafiltration of film production water return 2 front end of pretreatment system, carries out reverse osmosis reprocessing, obtains a desalted water.
Embodiment 3
Situation explanation:
Certain steel comprehensive wastewater Recycling Project treatment scale is 1000m3/ h, processing target are to be prepared into waste water once to remove
Salt water supplies enterprise's production, it is desirable that improves a demineralized water yield as far as possible.According to water analysis, determine that a demineralized water yield is
90%, then a demineralized water yield is 900m3/h。
Actually in conjunction with generation, a kind of process unit of demineralized water of high yield provided in this embodiment is the same as embodiment 1.
A kind of process of demineralized water of high yield, using above-mentioned process unit, comprising the following steps:
Step 1, the parameter setting of the process unit of demineralized water of high yield
The process unit of a demineralized water in high yield, the circular of relevant parameter are as follows:
(1) the reverse osmosis treatment scale calculation method of the process unit of demineralized water of high yield are as follows:
The reverse osmosis receipts of a reverse osmosis treatment scale=time demineralized water yield ÷ of the process unit of a demineralized water in high yield
Rate；
Wherein, a demineralized water yield=900m3/h；Reverse osmosis yield is 60%；
By calculating, the reverse osmosis treatment scale of the process unit of a demineralized water is 1500m in high yield3/h；
(2) in high yield in the process unit of a demineralized water, electricity expels the treatment scale calculation method of sub- film device are as follows:
Electricity expels the reverse osmosis treatment scale of the process unit of demineralized water for the treatment of scale=high yield for sub- film device
× (the reverse osmosis yield of 1-)=reverse osmosis concentrated water yield；
Specially electric treatment scale=1500 × (the 1-60%)=600m for expelling sub- film device3/h；
Electricity expels sub- film device water yield=(one original of reverse osmosis treatment scale of the process unit of a demineralized water in high yield
Water process amount) ÷ electricity expels the treatment scale of sub- film device；
Specially electricity expels sub- film device water yield=(1500-1000) ÷ 600=83.3, meets electricity and expels sub- film device
Water yield is 80~90% requirements；
The electricity expels sub- film device salt rejection rate greater than 60%；
Step 2, raw water A enters pretreatment system 2, obtained pretreated water by water tank 1 before ultrafiltration, wherein pretreatment
The SDI value of water is less than 3；
Step 3, pretreated water enters the high pressure pump system 4a of counter-infiltration system 4 by intermediate water tank 3, passes through RO film unit
4b progress is reverse osmosis, obtains demineralized water B and reverse osmosis concentrated water C；
Step 4, reverse osmosis concentrated water C drives the raw water of ionic membrane as electricity, is acted on by reverse osmosis concentrated water pressure and enters electric drive
Ion film device 5, pressure 0.15MPa, reverse osmosis concentrated water expel sub- film device 5 in electricity and carry out desalting processing, obtain 100m3/h
Electricity drives ionic membrane concentrated water D and 500m3/ h electricity drives ionic membrane and produces water, 100m3/ h electricity drives ionic membrane concentrated water D discharge；
Reverse osmosis concentrated water expels the concrete mode that sub- film device carries out desalting processing in electricity are as follows:
(1) electricity expels the positive-negative polarity that sub- film device expels the electrode of sub- film device by changing electricity, and timing pole is arranged,
The frequency of falling pole is 30min/ times；
(2) it is 6.5 that electricity, which drives ionic membrane concentrated water pH value, after hydrochloric acid is added, pH value 5.8；
(3) reverse osmosis concentrated water calcium ion and sulfate ion concentration product are 20000, drive to electricity and resistance is added in ionic membrane concentrated water
Dirty agent is added the amount of antisludging agent with electricity drive ionic membrane concentrated water volume and is calculated as 5mg/L；
Antisludging agent is the copolymer of polyacrylic acid and polymaleic anhydride, and molecular weight is 20000 dalton.
Step 5, electricity drives ionic membrane production water and is detected by SDI value on-line control system, and SDI 3.5, electricity expels son
Water tank 1 before the ultrafiltration of film production water return 2 front end of pretreatment system, carries out reverse osmosis reprocessing, obtains a desalted water.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (4)
1. a kind of process of demineralized water of high yield, the process unit of use include water tank before ultrafiltration, pretreatment system,
Intermediate water tank, counter-infiltration system, electricity expel sub- film device and SDI value on-line control system；
The counter-infiltration system is one-part form, specifically includes high-pressure pump and RO film unit；High-pressure pump is connected with RO film unit；
Water tank is connected with pretreatment system before ultrafiltration, and pretreatment system passes through the high-pressure pump phase of intermediate water tank and counter-infiltration system
Connection, the RO film unit of counter-infiltration system expel sub- film device with electricity and are connected, and electricity expels sub- film device by SDI value in line traffic control
System processed is connected with water tank, intermediate water tank before ultrafiltration respectively；
The pretreatment system includes quartz filter, active carbon filter and cartridge filter；Quartz filter and
Active carbon filter is connected, and active carbon filter is connected with cartridge filter；
It is characterized in that, the process of demineralized water of high yield, comprising the following steps:
Step 1, the parameter setting of the process unit of demineralized water of high yield
The reverse osmosis treatment scale and electricity of the process unit of a setting demineralized water of high yield expel the treatment scale of sub- film device；
The parameter setting of the process unit of demineralized water of high yield, circular are as follows:
(1) the reverse osmosis treatment scale calculation method of the process unit of demineralized water of high yield are as follows:
The reverse osmosis yield of a reverse osmosis treatment scale=time demineralized water yield ÷ of the process unit of a demineralized water in high yield；
Wherein, reverse osmosis yield is 50 ~ 60%；
(2) in high yield in the process unit of a demineralized water, electricity expels the treatment scale calculation method of sub- film device are as follows:
Electricity expels reverse osmosis treatment scale × (1- of the process unit of demineralized water for the treatment of scale=high yield for sub- film device
Reverse osmosis yield)=reverse osmosis concentrated water yield；
Electricity expel sub- film device water yield=(in high yield a demineralized water process unit reverse osmosis treatment scale-raw water at
Reason amount) ÷ electricity expels the treatment scale of sub- film device；
It is 80 ~ 90% that the electricity, which expels sub- film device water yield,；
The electricity expels sub- film device salt rejection rate not less than reverse osmosis yield；
Step 2, raw water enters pretreatment system by water tank before ultrafiltration, obtained pretreated water, wherein the SDI of pretreated water
Value is less than 3；
Step 3, pretreated water enters the high pressure pump system of counter-infiltration system by intermediate water tank, carries out reverse osmosis by RO film unit
Thoroughly, a demineralized water and reverse osmosis concentrated water are obtained；
Step 4, reverse osmosis concentrated water drives the raw water of ionic membrane as electricity, is acted on by reverse osmosis concentrated water pressure into electricity and drives ionic membrane
Equipment, pressure are 0.15 ~ 0.25MPa, and reverse osmosis concentrated water expels sub- film device in electricity and carries out desalting processing, obtain electricity and drive ionic membrane
Concentrated water and electricity drive ionic membrane and produce water, and electricity drives the discharge of ionic membrane concentrated water；
Step 5, electricity drives ionic membrane production water and is detected by SDI value on-line control system, there is the following two kinds situation:
When SDI≤3, electricity drives ionic membrane and produces the intermediate water tank that water returns to counter-infiltration system front end, carries out reverse osmosis reprocessing, obtains
Desalted water；
Work as SDI > 3, water tank before the ultrafiltration of electricity drive ionic membrane production water return pretreatment system front end carries out reverse osmosis reprocessing, obtains
To a desalted water.
2. the process of a demineralized water in high yield as described in claim 1, which is characterized in that in the step 4, instead
Infiltration concentrated water expels the concrete mode that sub- film device carries out desalting processing in electricity are as follows:
(1) electricity expels sub- film device setting timing pole, and the frequency of falling pole is 15 ~ 60min/ times；
(2) electricity drives ionic membrane concentrated water pH value≤6；
(3) it when reverse osmosis concentrated water calcium ion and sulfate ion concentration product >=20000, is then driven to electricity and resistance is added in ionic membrane concentrated water
Dirty agent is added the amount of antisludging agent with electricity drive ionic membrane concentrated water volume and is calculated as (3-5) mg/L.
3. the process of a demineralized water in high yield as claimed in claim 2, which is characterized in that the step 4 (2)
In, when electricity drives ionic membrane concentrated water pH value > 6, addition hydrochloric acid is adjusted.
4. the process of a demineralized water in high yield as claimed in claim 2, which is characterized in that the step 4 (3)
In, the antisludging agent is the copolymer of polyacrylic acid, poly or polyacrylic acid and poly, and molecular weight is
15000 ~ 20000 dalton.
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| CN103058421A (en) * | 2013-01-25 | 2013-04-24 | 河北省电力建设调整试验所 | Treatment method for recycling circulating sewage in power plant |
| CN203360220U (en) * | 2013-05-29 | 2013-12-25 | 天壕节能科技股份有限公司 | Wastewater treatment system for cleaning petroleum coke glass kiln waste heat boiler |
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