CN110980989A - Water-saving treatment system and treatment method for full-membrane-method first-stage reverse osmosis concentrated water - Google Patents
Water-saving treatment system and treatment method for full-membrane-method first-stage reverse osmosis concentrated water Download PDFInfo
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- CN110980989A CN110980989A CN201911278503.4A CN201911278503A CN110980989A CN 110980989 A CN110980989 A CN 110980989A CN 201911278503 A CN201911278503 A CN 201911278503A CN 110980989 A CN110980989 A CN 110980989A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The water-saving treatment system comprises an ultrafiltration water tank provided with an ultrafiltration water inlet pipeline, wherein the ultrafiltration water tank is sequentially connected with a water feed pump, a security filter, a high-pressure pump, a reverse osmosis device, an online conductivity meter and a first-stage reverse osmosis water tank through a reverse osmosis water production pipe, a concentrated water outlet pipe is arranged at the lower part of the reverse osmosis device and comprises a main pipe and two branch pipes communicated with a main pipe, namely a first branch pipe and a second branch pipe, an electric adjusting backflow valve is arranged on the first branch pipe and communicated with the ultrafiltration water tank to form a concentrated water backflow pipeline of the ultrafiltration water tank, an electric discharge valve is arranged on the second branch pipe, and the electric discharge valve is connected with a control system. The invention also discloses a method for water treatment by utilizing the full-membrane method primary reverse osmosis concentrated water-saving treatment system. By utilizing the invention, the recycling of reverse osmosis concentrated water can be realized; energy conservation and emission reduction are realized; the invention has obvious effect on the system water inlet with low salt content.
Description
Technical Field
The invention relates to a boiler makeup water treatment system and a water treatment method, in particular to a full-membrane-method first-stage reverse osmosis concentrated water-saving treatment system and a treatment method.
Background
In recent years, the full-membrane method is favored by a boiler make-up water treatment system of a power plant, and has the advantages of good effluent quality, stable operation, high automation degree, simple operation, high environmental protection benefit, small occupied area, small overhaul and maintenance amount and the like compared with the conventional ion exchange technology, and is particularly obvious in a system with small output. The disadvantages are that: the water recovery rate of the general first-stage reverse osmosis device is 60-80%, and a large amount of concentrated water can be discharged. At present, more and more power plants require energy conservation and emission reduction, even zero emission, which puts higher requirements on drainage. Some of the concentrated water in the power plant is supplemented to a front pool of the circulating cooling tower, some of the concentrated water is used for washing the ground, some of the concentrated water is directly discharged to a wastewater system for continuous treatment, and the concentrated water is evaporated and crystallized after being re-concentrated, so that measures are rarely taken at a concentrated water source of the reverse osmosis device to reduce the discharge of the concentrated water.
CN 201611159234.6 discloses a technical scheme of performing powdered activated carbon adsorption, coagulation and flocculation treatment on reverse osmosis concentrated water, and clear water with a first-level discharge standard can be obtained.
CN 201210383019.X discloses a technical scheme for treating reverse osmosis concentrated water by a subsequent process of a machining pool, a filter, primary electrodialysis and secondary electrodialysis, and the concentrated water can be recycled after the treatment reaches the standard.
CN 201320619004.9 discloses a technical scheme for directly leading out a branch pipe in a reverse osmosis concentrated water main pipe, and reducing the discharge amount of wastewater by adding devices such as a control valve, a pipeline pump, a sand filter, a cartridge filter, an intermediate water tank, etc. In the scheme, the concentrated water is completely reprocessed, but concentrated water recovery control parameters are not explained, the salt content of the water inlet body can be continuously enriched and enters the reverse osmosis device, the service life of the reverse osmosis membrane can be influenced, and higher requirements are provided for subsequent processes.
The technical scheme for treating reverse osmosis concentrated water increases a complex subsequent treatment system, occupies a large area and has high cost.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a full-membrane-method first-stage reverse osmosis concentrated water-saving treatment system and a treatment method which have small occupied area and simple process.
The invention adopts the technical scheme that the water-saving treatment system for the primary reverse osmosis concentrated water by the full-membrane method comprises an ultrafiltration water tank provided with an ultrafiltration water inlet pipeline, wherein the ultrafiltration water tank is sequentially connected with a water feed pump, a security filter, a high-pressure pump, a reverse osmosis device, an online conductivity meter and a primary reverse osmosis water tank through a reverse osmosis water production pipe, a concentrated water outlet pipe is arranged at the lower part of the reverse osmosis device and comprises a main pipeline and two branch pipes communicated with the main pipeline, namely a first branch pipe and a second branch pipe, an electric adjusting backflow valve is arranged on the first branch pipe and is communicated with the ultrafiltration water tank to form a concentrated water backflow pipeline of the ultrafiltration water tank, and an electric discharge valve is arranged on the second branch pipe. The electric discharge valve is connected with the control system, the data of the on-line conductivity meter can be transmitted to the control system in real time, and the control system feeds back signals to the electric discharge valve to control the opening and closing of the electric discharge valve.
Two water inlet pipelines are arranged at the top of the ultrafiltration water tank, the first water inlet pipeline is a water production pipeline of the ultrafiltration device, and the second water inlet pipeline is a primary reverse osmosis concentrated water pipe.
A method for treating water by using the full-membrane method first-stage reverse osmosis concentrated water-saving treatment system, which comprises the following steps,
(1) ultrafiltration water with large particle impurities in the inlet water of the system removed by the ultrafiltration device is stored in an ultrafiltration water tank through a first water inlet pipeline, qualified reverse osmosis concentrated water treated by the reverse osmosis device flows back to the ultrafiltration water tank through a second water inlet pipeline, and water in the two water inlet pipelines is uniformly mixed in the ultrafiltration water tank;
(2) the mixed water uniformly mixed in the ultrafiltration water tank is sent into a first-stage reverse osmosis cartridge filter through a feed pump;
(3) when the filtered water passes through, the pressure is increased to 1.4MPa-1.6MPa by the high-pressure pump, and the operating pressure of the reverse osmosis device is reached.
(4) And (4) the filtered produced water after pressure boosting enters a reverse osmosis device for desalting.
(5) The pre-desalted water produced by the reverse osmosis device is conveyed to a first-stage reverse osmosis water tank through a reverse osmosis water producing pipe; reading the pre-desalted produced water of the reverse osmosis device by an on-line conductivity meter, and starting an electric reflux valve by a concentrated water pipe to directly recycle the pre-desalted produced water to an ultrafiltration water tank when the conductivity is less than 100 mu S/cm; when the conductance is more than or equal to 100 mu S/cm, the concentrated water pipe starts the electric discharge valve to discharge to a wastewater system.
Furthermore, the filtering precision of the first-stage reverse osmosis cartridge filter is less than or equal to 100 mu m.
Furthermore, the desalination rate of the reverse osmosis device is 96-97%, and the recovery rate is 60-80%.
The invention has the following positive effects:
(1) in the mature full-membrane water treatment system of the existing power plant, a concentrated water pipe branch pipe of a primary reverse osmosis device, an online conductivity meter and two electric valves (an electric discharge valve and an electric regulation reflux valve) are added to realize the recycling of reverse osmosis concentrated water, the system is simple, the cost is low, the floor area is not increased, and the investment in the water treatment process can be reduced;
(2) the reverse osmosis device of the full-membrane method is utilized to carry out retreatment on qualified concentrated water, the discharge of concentrated water is reduced, simultaneously, the water inflow of the full-membrane method system is also reduced, the effects of saving energy and reducing emission are achieved, and especially the power plant which requires energy saving and emission reduction or zero emission is realized.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a water-saving treatment system of a first-stage reverse osmosis concentrated water by an all-membrane method.
In the figure: 1-an ultrafiltration water tank, 2-a water feeding pump, 3-a cartridge filter, 4-a high-pressure pump, 5-a reverse osmosis device, 6-an electric discharge valve, 7-an electric adjusting reflux valve, 8-an online conductivity meter, 9-a first-stage reverse osmosis water tank, A-a first water inlet pipeline, B-a second water inlet pipeline and C-a water production pipe.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The embodiment of the invention relates to a one-stage reverse osmosis concentrated water saving system adopting a full membrane method
Referring to fig. 1, this embodiment includes ultrafiltration water tank 1 that is equipped with the ultrafiltration water inlet channel, ultrafiltration water tank passes through reverse osmosis water production pipe and connects gradually feed pump 2, safety filter 3, high-pressure pump 4, reverse osmosis unit 5, online conductivity meter 8 and one-level reverse osmosis water tank 9, and reverse osmosis unit 5 lower part is equipped with the dense water outlet pipe, the dense water outlet pipe includes trunk line and two spinal branch pipes that communicate with the person in charge, first branch pipe and second branch pipe promptly, be equipped with electronic regulation backward flow valve 7 on the first branch pipe to communicate with ultrafiltration water tank 1, constitute the dense water return line of ultrafiltration water tank 1, be equipped with electronic discharge valve 6 on the second branch pipe, and connect to drainage system. The electric discharge valve 6 is connected with a control system (not shown in the figure), the data of the on-line conductivity meter 8 can be transmitted to the control system in real time, and the control system feeds back signals to the electric discharge valve 6 to control the opening and closing of the electric discharge valve 6.
Two water inlet pipelines are arranged at the top of the ultrafiltration water tank 1, the first water inlet pipeline A is an ultrafiltration water inlet pipeline, and the second water inlet pipeline B is a concentrated water return pipeline.
The high-pressure pump 4 boosts the pressure of the filtered water and sends the boosted filtered water into the reverse osmosis device 5, so that the operation requirement of the reverse osmosis device 5 is met.
Application method embodiment of first-stage reverse osmosis concentrated water saving system using whole membrane method
The embodiment comprises the following steps:
(1) after being treated by an ultrafiltration device to remove large granular substances such as organic matters, suspended matters and the like in the concentrated water, the concentrated water enters an ultrafiltration water tank 1 through a first water inlet pipeline A, qualified reverse osmosis concentrated water flows back to the ultrafiltration water tank 1 through a second water inlet pipeline B, and water in two pipelines is uniformly mixed;
(2) the mixed water uniformly mixed in the ultrafiltration water tank is sent into a first-stage reverse osmosis cartridge filter 3 through a water feeding pump 2, the filtering precision is 100 mu m, and a reverse osmosis membrane is protected from being blocked by dirt;
(3) when the filtered produced water passes through, the high-pressure pump 4 raises the pressure to 1.5MPa to reach the operating pressure of the reverse osmosis device 5;
(4) the filtered produced water after pressure boosting enters a reverse osmosis device 5 for desalting, the desalting rate is 96 percent, and the recovery rate is 70 percent;
(5) part of the filtered water produced in the reverse osmosis device 5 is conveyed to a first-stage reverse osmosis water tank 9 through a reverse osmosis water production pipe and is discharged through a water production pipe C for use in the subsequent process; when the reading of an on-line conductivity meter 8 on a water production pipe of the primary reverse osmosis device 5 is less than 100 mu S/cm, an electric adjusting reflux valve 7 is automatically opened, and concentrated water flows back to the top of the ultrafiltration water tank 1 through a first branch pipe, so that the concentrated water and water in the ultrafiltration water tank are fully mixed for use in subsequent processes; when the reading of the on-line conductivity meter 8 is more than or equal to 100 mu S/cm, the electric adjusting reflux valve 7 is closed, the electric discharge valve 6 is automatically started, and the concentrated water is directly discharged to a wastewater system through the second branch pipe.
The electric adjusting return valve 7 can automatically adjust the opening of the valve to realize the adjustment of the water quantity of the concentrated water, and finally, the state of the basic balance of the water quantity is achieved.
The first-stage reverse osmosis water production in the whole membrane method of the boiler feedwater treatment system of a certain power plant is 75t/h, the water recovery rate is 75%, the desalination rate is 96%, and the salt content and water saving amount of inlet water are shown in the following table:
| serial number | Salt content (ppm) | Recovery water volume of concentrated water (t/h) |
| 1 | 100 | 23.8 |
| 2 | 200 | 21.4 |
| 3 | 300 | 18.8 |
| 4 | 400 | 16.1 |
| 5 | 500 | 13.2 |
| 6 | 600 | 10.1 |
| 7 | 700 | 6.8 |
The invention has obvious effect on the system water inlet with low salt content.
Various modifications and variations of the present invention may be made by those skilled in the art, and they are still within the scope of the present patent invention provided they are within the scope of the claims and their equivalents.
What is not described in detail in the specification is prior art that is well known to those skilled in the art.
Claims (4)
1. The utility model provides a dense water-saving treatment system of full membrane method one-level reverse osmosis, includes the ultrafiltration water tank that is equipped with ultrafiltration water inlet channel, characterized in that: the utility model discloses a water supply device, including ultrafiltration water tank, main pipe, electric control valve, control system, electric discharge valve connection control system, the ultrafiltration water tank passes through reverse osmosis water production pipe and connects gradually feed-water pump, safety filter, high-pressure pump, reverse osmosis unit, online conductivity meter and one-level reverse osmosis water tank, the reverse osmosis unit lower part is equipped with the dense water outlet pipe, the dense water outlet pipe include the trunk line and with be responsible for two spinal branch pipes of intercommunication, first branch pipe and second branch pipe promptly, be equipped with the electrical control return valve on the first branch pipe to communicate with the ultrafiltration water tank, constitute the dense water return line of ultrafiltration water tank, be equipped with electronic blow-off valve on the second branch pipe, electronic blow-off valve connection control system, but.
2. A method for water treatment by using the full-membrane method first-stage reverse osmosis concentrated water-saving treatment system of claim 1, comprising the following steps,
(1) ultrafiltration water with large particle impurities in the inlet water of the system removed by the ultrafiltration device is stored in an ultrafiltration water tank through a first water inlet pipeline, qualified reverse osmosis concentrated water treated by the reverse osmosis device flows back to the ultrafiltration water tank through a second water inlet pipeline, and water in the two water inlet pipelines is uniformly mixed in the ultrafiltration water tank;
(2) the mixed water uniformly mixed in the ultrafiltration water tank is sent into a primary reverse osmosis cartridge filter through a primary reverse osmosis feed pump;
(3) when the filtered water passes, the pressure is increased to 1.4MPa-1.6MPa by the high-pressure pump to reach the operating pressure of the reverse osmosis device;
(4) the filtered produced water after pressure boosting enters a reverse osmosis device for desalting;
(5) the pre-desalted water produced by the reverse osmosis device is conveyed to a first-stage reverse osmosis water tank through a reverse osmosis water producing pipe; the online conductivity meter reads the filtered produced water in the reverse osmosis device, and when the conductivity is less than 100 mu S/cm, the concentrated water pipe starts the electric reflux valve to directly recycle the water to the ultrafiltration water tank; when the conductance is more than or equal to 100 mu S/cm, the concentrated water pipe starts the electric discharge valve to discharge to a wastewater system.
3. The method for water treatment by using the full-membrane one-stage reverse osmosis concentrated water-saving treatment system according to claim 2, wherein the filtration precision of the one-stage reverse osmosis cartridge filter is less than or equal to 100 μm.
4. The method for water treatment by using the full-membrane-method one-stage reverse osmosis concentrated water-saving treatment system as claimed in claim 3, wherein the salt rejection rate of the reverse osmosis device is 96-97%, and the recovery rate is 60-80%.
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| CN201911278503.4A CN110980989A (en) | 2019-12-12 | 2019-12-12 | Water-saving treatment system and treatment method for full-membrane-method first-stage reverse osmosis concentrated water |
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| CN201911278503.4A CN110980989A (en) | 2019-12-12 | 2019-12-12 | Water-saving treatment system and treatment method for full-membrane-method first-stage reverse osmosis concentrated water |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113461204A (en) * | 2021-06-30 | 2021-10-01 | 国核电力规划设计研究院有限公司 | Heat supply network supplementing water treatment device and method |
| CN113830858A (en) * | 2021-04-16 | 2021-12-24 | 国能朗新明南京环保科技有限公司 | System and method for recycling strong brine through ultrafiltration and reverse osmosis |
| CN114314752A (en) * | 2021-12-17 | 2022-04-12 | 南京中电环保水务有限公司 | Closed circulation reverse osmosis system and process |
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2019
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113830858A (en) * | 2021-04-16 | 2021-12-24 | 国能朗新明南京环保科技有限公司 | System and method for recycling strong brine through ultrafiltration and reverse osmosis |
| CN113461204A (en) * | 2021-06-30 | 2021-10-01 | 国核电力规划设计研究院有限公司 | Heat supply network supplementing water treatment device and method |
| CN114314752A (en) * | 2021-12-17 | 2022-04-12 | 南京中电环保水务有限公司 | Closed circulation reverse osmosis system and process |
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Application publication date: 20200410 |