CN215365193U - Treatment system for circulating sewage - Google Patents
Treatment system for circulating sewage Download PDFInfo
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- CN215365193U CN215365193U CN202120038026.0U CN202120038026U CN215365193U CN 215365193 U CN215365193 U CN 215365193U CN 202120038026 U CN202120038026 U CN 202120038026U CN 215365193 U CN215365193 U CN 215365193U
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Abstract
The utility model provides a treatment system for circulating sewage, and belongs to the technical field of sewage treatment. The circulating sewage treatment system comprises a pretreatment unit, an ultrafiltration treatment unit and an RO reverse osmosis unit which are connected in sequence; wherein, the pretreatment unit includes the regulation pond, the regulation pond is connected with the sedimentation tank, sedimentation tank upper portion is provided with charge device, sedimentation tank overflow is produced water and is got into the clear water tank, then gets into ultrafiltration processing unit and RO reverse osmosis unit, the muddy water that the sedimentation tank lower part is depositd gets into the pressure filter, and the filtrate that produces after the pressure filtration gets into the buffer pool, then the feedback to the sedimentation tank. The utility model can reduce the hardness in water to the maximum extent, and creates favorable conditions for subsequent membrane treatment, thereby greatly reducing the production cost of enterprises, and having good practical application value.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment, and particularly relates to a treatment system for circulating sewage.
Background
The information in this background section is only for enhancement of understanding of the general background of the utility model and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The circulating sewage is waste water which is formed by evaporating and concentrating industrial production water such as surface water, underground water and the like through a water cooling tower and has high salt content, larger hardness and complex components. The wastewater not only has high salt content and high hardness, but also contains partial organic matters, algae and microorganisms, and the circulating water is treated by adding medicines, and the wastewater also contains residues of chemical components such as partial bactericides, slime strippers, corrosion and scale inhibitors and the like.
The current environmental protection policy requirements are increasingly strict, and the circulating sewage as a kind of waste water with large water quantity and higher recycling value must realize zero discharge finally to achieve the purpose of grading recycling.
The traditional membrane treatment method available in the market is to add alkali for reaction, treat the mixture by a clarification tank or a sedimentation tank, filter the mixture by a sand filter, filter the mixture by ultrafiltration or microfiltration, and then perform reverse osmosis concentration treatment. The inventors found that the disadvantages of this method are: 1. the magnesium hydroxide crystal is fine, the traditional clarification, precipitation and sand filtration have poor filtering effect, and the residual magnesium hydroxide in the water causes large subsequent acid addition amount and increases the salt content in the water. 2. In order to achieve a better precipitation effect in the precipitation tank, the pH value should be more than 11.5. When the pH value is high, silicon dioxide in quartz sand is dissolved out, so that the normal operation and the service life of reverse osmosis are influenced, and the concentration multiple of the reverse osmosis is reduced. 3. The ultrafiltration membrane has poor tolerance to sewage treated by a sand filter, so that backwashing is frequent, the service life is greatly shortened, continuous operation cannot be realized, and the enterprise investment is greatly increased.
SUMMERY OF THE UTILITY MODEL
Aiming at the outstanding problems of short service life and high cost of an ultrafiltration membrane and a reverse osmosis membrane in common membrane treatment in the prior art, the utility model provides a treatment system for circulating sewage, which can reduce the hardness of water to the maximum extent and create favorable conditions for subsequent membrane treatment, thereby greatly reducing the production cost of enterprises and having good practical application value.
In order to achieve the purpose, the technical scheme of the utility model is as follows:
in a first aspect of the present invention, there is provided a circulating sewage treatment system comprising a pretreatment unit, an ultrafiltration treatment unit and an RO reverse osmosis unit connected in sequence;
wherein, the pretreatment unit includes the regulation pond, the regulation pond is connected with the sedimentation tank, sedimentation tank upper portion is provided with charge device, sedimentation tank overflow is produced water and is got into the clear water tank, then gets into ultrafiltration processing unit and RO reverse osmosis unit, the muddy water that the sedimentation tank lower part is depositd gets into the pressure filter, and the filtrate that produces after the pressure filtration gets into the buffer pool, then the feedback to the sedimentation tank.
The sedimentation tank is an integrated high-speed reaction sedimentation tank which can be made of reinforced concrete or carbon steel plates and is durable.
The filter press is a plate-and-frame filter press, and filter-pressing mud cakes generated by filter pressing are transported outwards.
The ultrafiltration treatment unit comprises a ceramic membrane filter, and the wastewater in the clean water tank enters the ceramic membrane filter for treatment, then is sent into the product water tank, and then enters the RO reverse osmosis unit.
The ceramic membrane filter adopts a tubular ceramic membrane, and has the advantages of high mechanical strength, long service life and the like.
The ceramic membrane used by the ceramic membrane filter can be made of aluminum oxide, zirconium oxide or titanium oxide by sintering, and the performance of the ceramic membrane filter is better. The filtering precision of the ceramic membrane is 0.01-1 mu m, and preferably 0.1 mu m.
And a water production pH rough adjustment acid adding device is arranged between the ceramic membrane filter and the water production tank and is used for further adjusting the pH of the wastewater entering the water production tank, so that the adverse effects of working conditions such as wastewater acid and alkali on the device are reduced.
The ceramic membrane filter is also connected with the cleaning pump and the cleaning and dosing device, so that the ceramic membrane filter is conveniently cleaned, and the service life of the ceramic membrane filter is prolonged.
The RO reverse osmosis unit comprises an RO reverse osmosis filter, and wastewater in the water production tank enters an RO recycling water tank and an RO concentrated water tank after entering the RO reverse osmosis filter for treatment.
The RO reverse osmosis desalination recovery rate is between 75 and 85 percent, and is further controlled to be between 80 and 85 percent.
Produce and be provided with RO into water pH fine tuning and add sour device between water tank and the RO reverse osmosis filter for the pH of the waste water that further accurate adjustment got into RO reverse osmosis filter reduces adverse effect that operating mode such as waste water acid-base produced the device.
The RO reverse osmosis filter is also connected with an RO cleaning device and an RO scale inhibitor feeding device, so that the RO reverse osmosis filter is conveniently cleaned, and the service life of the RO reverse osmosis filter is prolonged.
The reverse osmosis membrane of the RO reverse osmosis filter is selected from one of a roll type, a tube type or a hollow fiber type, and the reverse osmosis membrane is made of any one of polyamide and cellulose acetate.
In a second aspect of the present invention, there is provided a method for treating a circulating sewage, which comprises treating based on the above-mentioned circulating sewage system.
In a third aspect of the present invention, there is provided use of the above-mentioned circulating sewage treatment system and/or circulating sewage treatment method in any one or more of:
1) treating the circulating sewage;
2) recycling the sewage;
3) recycling the salt (such as NaCl) in the sewage.
The beneficial effects of one or more of the above technical solutions are as follows:
(1) after the treatment by the treatment system, the water treated by the membrane is recycled, the process of recycling sodium chloride in the concentrated water to brine is realized, water and salt can be recycled, the pollution of the membrane is reduced to the maximum extent, and the investment and the operating cost of ceramic membrane equipment are reduced.
(2) The process of combining the double alkali and the ceramic membrane filtration is adopted to remove the hardness in the circulating water, so that the impurities such as COD and the like are reduced to a certain extent, the service life of the reverse osmosis membrane is greatly prolonged, and the equipment investment is saved.
(3) Because the ceramic membrane has the characteristics of strong tolerance, stable property, long service life and stable water production, the defect that other separation technologies are influenced by working conditions such as temperature, acid and alkali is effectively overcome, the high operation cost caused by frequent replacement of the ultrafiltration membrane and fouling and blocking of the reverse osmosis membrane due to attenuation of the ultrafiltration membrane is avoided, and the operation cost is greatly reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model.
FIG. 1 is a schematic view of a circulating sewage treatment system in an embodiment of the present invention.
In the figure: 1. the system comprises a regulating water tank, a 2 integrated high-speed reaction sedimentation tank, a 3 clean water tank, a 4 buffer water tank, a 5 plate-and-frame filter press, a 6 ceramic membrane filter, a 7 product water tank, a 8 RO reverse osmosis filter, a 9 RO recycling water tank, and a 10 RO concentrated water tank.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only terms of relationships determined for convenience of describing structural relationships of the parts or elements of the present invention, and are not intended to refer to any parts or elements of the present invention, and are not to be construed as limiting the present invention.
In one embodiment of the present invention, there is provided a circulating sewage treatment system comprising a pretreatment unit, an ultrafiltration treatment unit and an RO reverse osmosis unit connected in sequence;
the pretreatment unit includes the regulation pond, the regulation pond is connected with the sedimentation tank, sedimentation tank upper portion is provided with charge device, the sedimentation tank overflow is produced water and is got into the clear water tank, then gets into ultrafiltration processing unit and RO reverse osmosis unit, the muddy water that the sedimentation tank lower part is depositd gets into the pressure filter, and the filtrate that produces after the filter-pressing gets into the buffer pool, then the feedback to the sedimentation tank.
In another embodiment of the present invention, the sedimentation tank is an integrated high-speed reaction sedimentation tank, which may be made of reinforced concrete or carbon steel plate, and is durable.
In another embodiment of the utility model, the filter press is a plate-and-frame filter press, and filter-press mud cakes generated by filter pressing are transported outwards.
In another embodiment of the present invention, the ultrafiltration treatment unit comprises a ceramic membrane filter, and the wastewater in the clean water tank enters the ceramic membrane filter for treatment, then enters the product water tank, and then enters the RO reverse osmosis unit.
In another embodiment of the present invention, the ceramic membrane filter is a tubular ceramic membrane, which has the advantages of high mechanical strength, long service life, etc.
In another embodiment of the present invention, the ceramic membrane used in the ceramic membrane filter may be made of sintered alumina, zirconia, or titania, which has better performance. The filtering precision of the ceramic membrane is 0.01-1 mu m, and preferably 0.1 mu m.
In another specific embodiment of the utility model, a water production pH rough adjustment and acid addition device is arranged between the ceramic membrane filter and the water production tank and is used for further adjusting the pH of the wastewater entering the water production tank, so that adverse effects of working conditions such as wastewater acid and alkali on the device are reduced.
In another embodiment of the present invention, the ceramic membrane filter is further connected to a cleaning pump and a cleaning and dosing device, so as to facilitate cleaning of the ceramic membrane filter and prolong the service life of the ceramic membrane filter.
In another embodiment of the present invention, the RO reverse osmosis unit comprises an RO reverse osmosis filter, and the wastewater in the production water tank enters the RO reverse osmosis filter for treatment and then enters the RO reuse water tank and the RO concentrate tank.
In yet another embodiment of the present invention, the RO reverse osmosis desalination recovery rate is between 75-85%, and further controlled to be 80-85%.
In another embodiment of the utility model, an RO influent pH fine adjustment acidification device is arranged between the water production tank and the RO reverse osmosis filter, and is used for further and precisely adjusting the pH of wastewater entering the RO reverse osmosis filter, so as to reduce adverse effects of working conditions such as wastewater acid and alkali on the device.
In another embodiment of the present invention, the RO reverse osmosis filter is further connected to an RO cleaning device and an RO scale inhibitor dosing device, respectively, so as to facilitate cleaning of the RO reverse osmosis filter and prolong the service life thereof.
In still another embodiment of the present invention, the reverse osmosis membrane of the RO reverse osmosis filter is one of a roll type, a tube type and a hollow fiber type, and the reverse osmosis membrane is made of any one of polyamide and cellulose acetate.
In still another embodiment of the present invention, there is provided a method for treating circulating sewage, which comprises treating based on the above-described circulating sewage system.
In still another embodiment of the present invention, there is provided a use of the above-mentioned circulating sewage treatment system and/or circulating sewage treatment method in any one or more of:
1) treating the circulating sewage;
2) recycling the sewage;
3) recycling the salt (such as NaCl) in the sewage.
The present invention is further illustrated by reference to specific examples, which are intended to be illustrative only and not limiting.
Example 1
A circulating sewage treatment system comprises a pretreatment unit, an ultrafiltration treatment unit and an RO reverse osmosis unit which are connected in sequence;
the pretreatment unit comprises an adjusting water tank 1, the adjusting water tank 1 is connected with an integrated high-speed reaction sedimentation tank 2, a dosing device is arranged at the upper part of the integrated high-speed reaction sedimentation tank 2, sodium carbonate and sodium hydroxide are loaded in the dosing device, overflow produced water of the integrated high-speed reaction sedimentation tank 2 enters a clear water tank 3 and then enters an ultrafiltration treatment unit and an RO reverse osmosis unit, muddy water precipitated at the lower part of the integrated high-speed reaction sedimentation tank 2 enters a plate-and-frame filter press 4, and filtrate generated after filter pressing enters a buffer water tank 5 and then is returned to the integrated high-speed reaction sedimentation tank 2; and (5) transporting the filter-pressing mud cakes generated by filter pressing outwards.
Example 2
A circulating sewage treatment system comprises a pretreatment unit, an ultrafiltration treatment unit and an RO reverse osmosis unit which are connected in sequence;
the pretreatment unit comprises an adjusting water tank 1, the adjusting water tank 1 is connected with an integrated high-speed reaction sedimentation tank 2, a dosing device is arranged at the upper part of the integrated high-speed reaction sedimentation tank 2, sodium carbonate and sodium hydroxide are loaded in the dosing device, overflow produced water of the integrated high-speed reaction sedimentation tank 2 enters a clear water tank 3 and then enters an ultrafiltration treatment unit and an RO reverse osmosis unit, muddy water precipitated at the lower part of the integrated high-speed reaction sedimentation tank 2 enters a plate-and-frame filter press 4, and filtrate generated after filter pressing enters a buffer water tank 5 and then is returned to the integrated high-speed reaction sedimentation tank 2; and (5) transporting the filter-pressing mud cakes generated by filter pressing outwards.
The ultrafiltration treatment unit comprises a ceramic membrane filter 6, and the wastewater in the clean water tank 3 enters the ceramic membrane filter 6 for treatment, then is sent to a production water tank 7, and then enters the RO reverse osmosis unit.
The RO reverse osmosis unit comprises an RO reverse osmosis filter 8, and the wastewater in the water production tank 7 enters an RO reuse water tank 9 and an RO concentrated water tank 10 after being treated by the RO reverse osmosis filter 8.
The operation method of the circulating sewage treatment system comprises the following steps:
the circulating sewage waste water firstly flows to a regulating water tank 1 through a pipeline for homogenization, then enters an integrated high-speed reaction sedimentation tank 2 through a lifting water pump, the total hardness in the sewage is reduced to be below 100mg/L along with the addition of sodium carbonate and sodium hydroxide in a dosing device, the overflow produced water of the integrated high-speed reaction sedimentation tank 2 enters a clear water tank 3, the muddy water precipitated at the lower part enters a plate-and-frame filter press 4 for filter pressing, the filtrate enters a buffer water tank 5 and then is conveyed back to the integrated high-speed reaction sedimentation tank 2, and filter-pressed mud cakes are transported outside.
The water in the clean water tank 3 is sent into a ceramic membrane filter 6 through a pipeline and a pump, the turbidity of the produced water is reduced to less than 1NTU through the filtration of the ceramic membrane, the produced water enters a produced water tank 7 and then is sent to an RO reverse osmosis filter 8 through the pump. The water production index is controlled in the recycling condition by the filtration of the RO reverse osmosis membrane, the conductivity is less than 800 mus/cm, and the chloride ion is less than 300 mg/L. The produced water enters an RO recycling water tank 9, the concentrated water enters an RO concentrated water tank 10 and is respectively delivered to the production area through a water pump and a pipeline.
Through the treatment to the circulation blowdown waste water, the product water has reached the retrieval and utilization condition of industrial raw water, and dense water satisfies the inlet water condition of ionic membrane caustic soda salt brine process and acetylene generation process device to reach the zero release and the retrieval and utilization of 100% of circulation blowdown water, very big improvement the water utilization ratio, and reduced the manufacturing cost of enterprise.
Example 3
A circulating sewage treatment system comprises a pretreatment unit, an ultrafiltration treatment unit and an RO reverse osmosis unit which are connected in sequence;
the pretreatment unit comprises an adjusting water tank 1, the adjusting water tank 1 is connected with an integrated high-speed reaction sedimentation tank 2, a dosing device is arranged at the upper part of the integrated high-speed reaction sedimentation tank 2, sodium carbonate and sodium hydroxide are loaded in the dosing device, overflow produced water of the integrated high-speed reaction sedimentation tank 2 enters a clear water tank 3 and then enters an ultrafiltration treatment unit and an RO reverse osmosis unit, muddy water precipitated at the lower part of the integrated high-speed reaction sedimentation tank 2 enters a plate-and-frame filter press 4, and filtrate generated after filter pressing enters a buffer water tank 5 and then is returned to the integrated high-speed reaction sedimentation tank 2; and (5) transporting the filter-pressing mud cakes generated by filter pressing outwards.
The ultrafiltration treatment unit comprises a ceramic membrane filter 6, and the wastewater in the clean water tank 3 enters the ceramic membrane filter 6 for treatment, then is sent to a production water tank 7, and then enters the RO reverse osmosis unit.
The ceramic membrane filter 6 is a tubular ceramic membrane, and has the advantages of high mechanical strength, long service life and the like. The ceramic membrane material used by the ceramic membrane filter 6 can be made of alumina, zirconia or titanium oxide by sintering, and the performance is better. The filtering precision of the ceramic membrane is 0.01-1 mu m, and preferably 0.1 mu m.
And a water production pH rough adjustment acid adding device is arranged between the ceramic membrane filter 6 and the water production tank 7 and is used for further adjusting the pH of the wastewater entering the water production tank, so that the adverse effects of working conditions such as wastewater acid and alkali on the device are reduced.
The ceramic membrane filter 6 is also respectively connected with the cleaning pump and the cleaning and dosing device, so that the ceramic membrane filter is conveniently cleaned, and the service life of the ceramic membrane filter is prolonged.
The RO reverse osmosis unit comprises an RO reverse osmosis filter 8, and the wastewater in the water production tank 7 enters an RO reuse water tank 9 and an RO concentrated water tank 10 after being treated by the RO reverse osmosis filter 8.
Produce and be provided with RO into water pH fine tuning and add sour device between water tank 7 and the RO reverse osmosis filter 8 for the pH of the waste water that further accurate adjustment got into RO reverse osmosis filter reduces the adverse effect that operating modes such as waste water acid-base produced the device.
The RO reverse osmosis filter 8 is also connected with the RO cleaning device and the RO scale inhibitor feeding device respectively, thereby being convenient to clean the RO reverse osmosis filter and prolonging the service life of the RO reverse osmosis filter.
The reverse osmosis membrane of the RO reverse osmosis filter 8 is selected from one of a roll type, a tube type or a hollow fiber type, and the reverse osmosis membrane is made of any one of polyamide and cellulose acetate.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A circulating sewage treatment system is characterized by comprising a pretreatment unit, an ultrafiltration treatment unit and an RO reverse osmosis unit which are connected in sequence;
wherein, the pretreatment unit includes the regulation pond, the regulation pond is connected with the sedimentation tank, sedimentation tank upper portion is provided with charge device, sedimentation tank overflow is produced water and is got into the clear water tank, then gets into ultrafiltration processing unit and RO reverse osmosis unit, the muddy water that the sedimentation tank lower part is depositd gets into the pressure filter, and the filtrate that produces after the pressure filtration gets into the buffer pool, then the feedback to the sedimentation tank.
2. The circulating sewage treatment system of claim 1 wherein the settling tank is an integrated high-speed reaction settling tank.
3. The circulating sewer treatment system of claim 1, wherein said filter press is a plate and frame filter press.
4. The circulating sewage treatment system of claim 1 wherein the ultrafiltration treatment unit comprises a ceramic membrane filter, and wastewater in the clean water tank enters the ceramic membrane filter for treatment, then is sent to the product water tank, and then enters the RO reverse osmosis unit.
5. The circulating waste water treatment system as claimed in claim 4, wherein the ceramic membrane filter is a tubular ceramic membrane.
6. The circulating sewage treatment system of claim 4 wherein a water production pH rough adjustment and acid addition device is arranged between the ceramic membrane filter and the water production tank.
7. The circulating blowdown water treatment system of claim 4, wherein the ceramic membrane filter is further connected to a cleaning pump and a cleaning and dosing device.
8. The circulating sewage treatment system of claim 4 wherein the RO reverse osmosis unit comprises an RO reverse osmosis filter, and wastewater in the production tank is treated by the RO reverse osmosis filter and then enters an RO reuse tank and an RO concentrate tank.
9. The circulating sewage treatment system of claim 8 wherein an RO feed water pH fine adjustment acidification device is arranged between the water production tank and the RO reverse osmosis filter.
10. The circulating sewage treatment system of claim 8 wherein the RO reverse osmosis filter is further connected to an RO cleaning device and an RO scale inhibitor dosing device, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120038026.0U CN215365193U (en) | 2021-01-07 | 2021-01-07 | Treatment system for circulating sewage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120038026.0U CN215365193U (en) | 2021-01-07 | 2021-01-07 | Treatment system for circulating sewage |
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| CN215365193U true CN215365193U (en) | 2021-12-31 |
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| CN202120038026.0U Active CN215365193U (en) | 2021-01-07 | 2021-01-07 | Treatment system for circulating sewage |
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- 2021-01-07 CN CN202120038026.0U patent/CN215365193U/en active Active
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