CN111875007A - Anti-scaling electric adsorption system suitable for high-hardness wastewater - Google Patents
Anti-scaling electric adsorption system suitable for high-hardness wastewater Download PDFInfo
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- CN111875007A CN111875007A CN202010896586.XA CN202010896586A CN111875007A CN 111875007 A CN111875007 A CN 111875007A CN 202010896586 A CN202010896586 A CN 202010896586A CN 111875007 A CN111875007 A CN 111875007A
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- C02F1/00—Treatment of water, waste water, or sewage
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
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Abstract
The invention relates to a scaling-resistant electric adsorption system suitable for high-hardness wastewater, which comprises: the first adsorption module and the second adsorption module are used for adsorbing the original wastewater to obtain initial treated water; a raw water tank in which the raw wastewater is stored; the first regeneration water tank and the second regeneration water tank are used for cyclic desorption regeneration of the adsorption module and discharge of concentrated solution; and a fresh water tank, a water pump and a valve. Compared with other membrane concentration and decrement technologies, the water inlet hardness index of the invention has better tolerance. The method does not need to be softened before actual wastewater is treated, and only simple clarification is carried out, so that the problems of hardness scaling, channel fouling and the like on the surface of the electrode can be avoided. Meanwhile, the invention does not produce secondary pollution.
Description
Technical Field
The invention relates to the technical field of electric adsorption, in particular to a scaling-resistant electric adsorption system suitable for high-hardness wastewater.
Background
The electro-adsorption technology is a water treatment desalination technology based on the double electric layer capacitance theory, and has the comparative advantages of low energy consumption, easy maintenance, long relative service life of a desalination module, low investment cost and less secondary pollution. At present, the application fields of the electric adsorption technology are gradually wide, and the electric adsorption technology comprises the aspects of saline water desalination, heavy metal adsorption and enrichment, brackish water desalination, chemical wastewater desalination and recovery, power plant circulating cooling water treatment and the like.
Due to the continuous development and progress of electrode materials, technical principles and equipment structures, indexes such as unit desalination amount, fresh water recovery rate, TDS (total dissolved solids) upper limit of concentrated water and the like of the electro-adsorption technology are continuously improved. Electro-adsorption is increasingly beginning to be tried in the treatment of various types of actual industrial wastewater. Meanwhile, the water quality of the actual industrial wastewater is relatively complex, and various factors have influence on the stable operation of the electro-adsorption treatment process. For example, the hardness components in the wastewater have hardness resistance performance superior to that of the conventional roll-type reverse osmosis technology in principle under the same water quality and treatment requirements; however, the long-term operation still causes scaling on the surface of the electrode in the electro-adsorption equipment, fouling and blocking of the flow channel, and the like, and affects the safe and stable operation and the actual treatment capacity of the equipment, so that the influence of hardness scaling needs to be solved urgently.
At present, the way of inhibiting scaling and ensuring the adsorption efficiency of electrode materials is adopted, and measures are taken to include acid washing in a regeneration stage, for example, an acid liquor is used for cleaning an electro-adsorption module disclosed in a patent with the application of CN201210090212.4 and the name of an electro-adsorption demineralized water treatment method; however, when the electro-adsorption equipment is washed with the medicine, a strand of acidic wastewater containing hardness is generated, and secondary pollution is generated. The prior art also comprises softening pretreatment of the electro-adsorption inlet water, and the addition of a complex chemical dosing softening clarification or ionic resin deep softening process to control the hardness content in the wastewater within a certain range, thereby inhibiting the saturated precipitation and crystallization scaling of insoluble salts in the electro-adsorption inner concentrated water, but the method increases the overall operation cost of the process, and seriously influences the relative advantage of the low operation cost of the electro-adsorption process in the quality comparison of various treatment technologies for treating industrial wastewater by membrane concentration and decrement. How to optimize the electro-adsorption technology and improve the equipment body, better avoid the relevant influence of the hardness of the inlet water, solve the practical puzzlement problem in the application of the electro-adsorption engineering, and urgently await research.
Disclosure of Invention
The invention aims to provide a scaling-resistant electric adsorption system suitable for high-hardness wastewater, which greatly improves the hardness control requirement of inlet water quality of electric adsorption equipment in terms of operation principle, thereby fundamentally and effectively avoiding and solving the adverse effect caused by hardness scaling in the electric adsorption equipment; compared with other membrane concentration and decrement technologies, the method does not need softening pretreatment, and can be used for simply clarifying the inlet water.
In order to achieve the purpose, the invention provides the following scheme:
an electro-adhesion system comprising:
the electric adsorption device is used for adsorbing the original wastewater to obtain initial treated water;
the electric adsorption device comprises n first adsorption units and m second adsorption units; n and m are positive integers greater than or equal to 1; the first adsorption unit is used for adsorbing charged anions in the original wastewater; the second adsorption unit is used for adsorbing charged cations in the original wastewater;
the raw water tank is used for storing the raw wastewater into the raw water tank through a first inlet end of the raw water tank, an outlet end of the raw water tank is connected with an inlet end of the electric adsorption device, and a second inlet end of the raw water tank is connected with a first outlet end of the electric adsorption device;
the detection device is used for detecting the initial treated water, and if the initial treated water does not meet the set standard, the initial treated water circulates to the electric adsorption device through the raw water tank to be subjected to re-adsorption treatment; and if the initial treated water reaches the set standard, discharging fresh water through a second outlet end of the electric adsorption device, wherein the fresh water is the initial treated water reaching the set standard.
Preferably, the first adsorption unit includes: a first anode plate, a first cathode plate, and a monovalent anion selective exchange membrane; the first anode plate and the first cathode plate are oppositely arranged, and the anion membrane is attached to the first cathode plate;
the second adsorption unit includes: a second anode plate, a second cathode plate and a monovalent cation selective exchange membrane; the second anode plate and the second cathode plate are oppositely arranged, and the cation membrane is attached to the second anode plate;
preferably, the first anode plate includes: a first anode, a first anode tab, and a first positive current collector; the first anode tab is connected with the first anode; the first positive current collector is attached to the first anode;
the first cathode plate includes: the first cathode, the first cathode tab and the first negative current collector; the first cathode tab is connected with the first cathode; the first negative current collector is attached to the first cathode, and the anion membrane is attached to the first negative current collector.
Preferably, the second anode plate includes: a second anode, a second anode tab, and a second positive current collector; the second anode tab is connected with the second anode; the second positive current collector is attached to the second anode, and the cationic membrane is attached to the second positive current collector;
the second cathode plate includes: the second cathode, the second cathode tab and the second negative current collector; the second cathode tab is connected with the second cathode; the second negative current collector is attached to the second cathode.
Preferably, the system further comprises:
the first regeneration water tank is connected with each first adsorption unit and is used for carrying out desorption regeneration treatment on each first adsorption unit;
and the second regeneration water tank is connected with each second adsorption unit and is used for carrying out desorption regeneration treatment on each second adsorption unit.
Preferably, the system further comprises:
and the fresh water tank is connected with the second outlet end of the electric adsorption device and is used for storing the fresh water.
Preferably, the system further comprises:
and the first water pump is arranged between the outlet end of the raw water tank and the inlet end of the electric adsorption device and is used for conveying the raw wastewater and/or the initial treated water to the electric adsorption device.
Preferably, the system further comprises:
a second water pump for conveying the regenerated water in the first regenerated water tank to each of the first adsorption units;
and the third water pump is used for conveying the regenerated water in the second regenerated water tank to each second adsorption unit.
Preferably, the system further comprises: a first flange hole and a second flange hole;
the first flange hole and the second flange hole are arranged on the electric adsorption device and used for sampling the initial treatment water so as to detect through the detection device.
Preferably, the industrial wastewater is sequentially subjected to precipitation, flocculation, clarification and filtration to form the original wastewater, and the original wastewater is stored in the raw water tank.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention relates to a scaling-resistant electric adsorption system suitable for high-hardness wastewater, which comprises: the electric adsorption device is used for adsorbing the original wastewater to obtain initial treated water; a raw water tank in which the raw wastewater is stored; the detection device is used for detecting the initial treated water, and if the initial treated water does not meet the set standard, the initial treated water circulates to the electric adsorption device through the raw water tank to be subjected to re-adsorption treatment; and if the initial treated water reaches the set standard, discharging the initial treated water through a second outlet end of the electric adsorption device. Compared with other membrane concentration and decrement technologies, the method has the advantages that softening pretreatment is not needed for water inlet, and only simple clarification treatment is performed; meanwhile, the invention does not produce secondary pollution, and solves the problems of scaling on the surface of the electrode, dirt blockage of a flow passage and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a block diagram of a scale resistant electro-adsorption system suitable for high hardness wastewater in accordance with the present invention;
FIG. 2 is a view showing the construction of a first adsorption unit of the present invention;
FIG. 3 is a structural view of a second adsorption unit of the present invention.
Description of the symbols: 1-an electro-adsorption device, 2-a raw water tank, 3-a fresh water tank, 4-a first regenerated water tank, 5-a second regenerated water tank, 11-a first adsorption module, 12-a second adsorption module, 61-a first water pump, 62-a second water pump, 63-a third water pump, 71-a first check valve, 72-a second check valve, 73-a third check valve, 81-a first valve, 82-a second valve, 83-a third valve, 84-a fourth valve, 85-a fifth valve, 86-a sixth valve, 87-a seventh valve, 88-an eighth valve, 91-a first flange hole, 92-a second flange hole, 111-a first anode plate, 112-a first cathode plate, 113-a monovalent anion selective exchange membrane, 121-a second anode plate, 122-second cathode plate, 123-monovalent cation selective exchange membrane.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a scaling-resistant electric adsorption system suitable for high-hardness wastewater, which greatly improves the hardness control requirement of inlet water quality of electric adsorption equipment in terms of operation principle, thereby fundamentally and effectively avoiding and solving the adverse effect caused by hardness scaling in the electric adsorption equipment; compared with other membrane concentration and decrement technologies, the method does not need softening pretreatment, and can be used for simply clarifying the inlet water.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a structural view of an electric adsorption system of the present invention, and as shown in fig. 1, the present invention provides an electric adsorption system including: the device comprises an electric adsorption device 1, a raw water tank 2, a fresh water tank 3 and a detection device.
The electric adsorption device 1 is used for adsorbing original wastewater to obtain initial treated water.
Specifically, the electro-adsorption device 1 includes n first adsorption units and m second adsorption units; the first adsorption unit is used for adsorbing cations and monovalent anions in the original wastewater; the second adsorption unit is used for adsorbing monovalent cations and anions in the original wastewater. n and m are positive integers greater than or equal to 1; the specific number is selected according to actual requirements. In this embodiment, the first adsorption units are connected in parallel to form a first adsorption module 11, and the second adsorption units are connected in parallel to form a second adsorption module 12; the first adsorption module 11 and the second adsorption module 12 are connected in series through a first valve 81 to form the electro-adsorption device 1.
The raw waste water is stored in the raw water tank 2 through a first inlet end of the raw water tank 2; the outlet end of the raw water tank 2 is connected with the first inlet end of the first adsorption module 11 sequentially through a first water pump 61 and a first check valve 71, and the first outlet end of the second adsorption module 12 is connected with the second inlet end of the raw water tank 2 sequentially through a second valve 82 and a third valve 83. The first water pump 61 is used to deliver the raw wastewater and/or the initial treated water to the first adsorption module 11.
The detection device is used for detecting the initial treated water, and if the initial treated water does not meet the set standard, the initial treated water circulates to the electric adsorption device 1 through the raw water tank 2 to be subjected to re-adsorption treatment; if the initial treated water reaches a set standard, fresh water is discharged into the fresh water tank 3 through the first outlet end of the second adsorption module 12, the second valve 82 and the fourth valve 84 in sequence, and the fresh water tank 3 stores the fresh water. The fresh water is the initial treated water which reaches a set standard.
As shown in fig. 2 and 3, the first adsorption unit of the present invention includes: a first anode plate 111, a first cathode plate 112, and an anion membrane 113.
The first anode plate 111 and the first cathode plate 112 are disposed opposite to each other, and the monovalent anion selective exchange membrane 113 is attached to the first cathode plate 112.
The second adsorption unit includes: a second anode plate 121, a second cathode plate 122, and a monovalent cation selective exchange membrane 123.
The second anode plate 121 and the second cathode plate 122 are oppositely arranged, and the monovalent cation selective exchange membrane 123 is attached to the second anode plate 121.
Specifically, the first anode plate 111 includes: a first anode, a first anode tab, and a first anode current collector.
The first anode tab is connected with the first anode; the first anode current collector is attached to the first anode.
The first cathode plate 112 includes: a first cathode, a first cathode tab, and a first cathode current collector.
The first cathode tab is connected with the first cathode; the first cathodic current collector is attached to the first cathode, and the anionic monovalent ion membrane 113 is attached to the first cathodic current collector.
Further, the second anode plate 121 includes: a second anode, a second anode tab, and a second anode current collector.
The second anode tab is connected with the second anode; the second anode current collector is attached to the second anode, and the monovalent cation selective exchange membrane 123 is attached to the second anode current collector.
The second cathode plate 122 includes: a second cathode, a second cathode tab, and a second cathode current collector.
The second cathode tab is connected with the second cathode; the second cathodic current collector is attached to the second cathode.
In the process of adsorbing the original wastewater by the electro-adsorption device 1, monovalent anions in the original wastewater permeate the monovalent anion selective exchange membrane 113 to be adsorbed on the first cathode plate 112, and monovalent cations in the original wastewater permeate the monovalent cation selective exchange membrane 123 to be adsorbed on the second anode plate 121, so that the first regeneration water tank 4 is arranged to perform desorption and regeneration treatment on the first adsorption module 11, and the second regeneration water tank 5 is arranged to perform desorption and regeneration treatment on the second adsorption module 12.
Specifically, the outlet end of the first regenerated water tank 4 is connected to the second inlet end of the first adsorption module 11 sequentially through the second water pump 62 and the second check valve 72, and the outlet end of the first adsorption module 11 is connected to the inlet end of the first regenerated water tank 4 through the fifth valve 85. The outlet end of the second regeneration water tank 5 is connected with the inlet end of the second adsorption module 12 sequentially through a third water pump 63 and a third check valve 73, and the second outlet end of the second adsorption module 12 is connected with the inlet end of the second regeneration water tank 5 through a sixth valve 86.
The second water pump 62 is used for conveying the regenerated water in the first regenerated water tank 4 to the first adsorption module 11; the third water pump 63 is configured to deliver the regenerated water in the second regenerated water tank 5 to the second adsorption module 12.
When the regenerated water in the first regenerated water tank 4 simultaneously satisfies the following two conditions, the regenerated water in the first regenerated water tank 4 is discharged through the outlet end of the first regenerated water tank 4, the second water pump 62, and the seventh valve 87 in this order.
1) The total amount of soluble solids exceeds a first set point.
2) The conductivity exceeds a second set value.
3) The instantaneous fresh water quality of the first adsorption unit exceeds a third design value.
Similarly, when the regenerated water in the second regenerated water tank 5 simultaneously satisfies the following two conditions, the regenerated water in the second regenerated water tank 5 is discharged through the outlet end of the second regenerated water tank 5, the third water pump 63, and the eighth valve 88 in this order.
1) The total amount of soluble solids exceeds a first set point.
2) The conductivity exceeds a second set value.
3) The instantaneous fresh water quality of the second adsorption unit exceeds a third design value.
In order to change the flow direction of the flow channel of the electric adsorption device 1 and simultaneously facilitate the upgrade and change of the desorption regeneration mode, the system of the invention further comprises: a first flange hole 91 and a second flange hole 92.
The first flange hole 91 is disposed near a first inlet of the first adsorption module 11, and the second flange hole 92 is disposed near a first outlet of the second adsorption module 12.
The first flange hole 91 and the second flange hole 92 are also used for sampling the initial treated water to be detected by the detection device.
As an alternative embodiment, the raw wastewater of the present invention is formed by sequentially performing precipitation, flocculation, clarification and filtration on industrial wastewater.
The invention has the following specific beneficial effects:
1) the tolerance of the electric adsorption equipment to the hardness of the inlet water is improved.
2) When the industrial wastewater with higher hardness is treated, the softening pretreatment process is omitted at the front end of the electro-adsorption process, so that the equipment investment cost and the operation cost of adding the softening agent can be reduced.
3) Thereby avoiding the generation of secondary pollution.
4) The electro-adsorption with different structural forms, such as horizontal CDI (catalytic dissociation), flow-through CDI, MCDI (membrane active dissociation), part of FCDI (flow catalytic dissociation) and the like, can be modified according to the idea of the invention to improve the tolerance hardness and avoid the precipitation and scaling of insoluble salt.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to assist understanding of the system and its core concepts; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A fouling resistant electro-adsorption system suitable for high hardness wastewater, comprising:
the electric adsorption device is used for adsorbing the original wastewater to obtain initial treated water;
the electric adsorption device comprises n first adsorption units and m second adsorption units; n and m are positive integers greater than or equal to 1; the first adsorption unit is used for adsorbing cations and monovalent anions in the original wastewater; the second adsorption unit is used for adsorbing monovalent cations and anions in the original wastewater;
the raw water tank is used for storing the raw wastewater into the raw water tank through a first inlet end of the raw water tank, an outlet end of the raw water tank is connected with an inlet end of the electric adsorption device, and a second inlet end of the raw water tank is connected with a first outlet end of the electric adsorption device;
the detection device is used for detecting the initial treated water, and if the initial treated water does not meet the set standard, the initial treated water circulates to the electric adsorption device through the raw water tank to be subjected to re-adsorption treatment; and if the initial treated water reaches the set standard, discharging fresh water through a second outlet end of the electric adsorption device, wherein the fresh water is the initial treated water reaching the set standard.
2. The system of claim 1, wherein the first adsorption unit comprises: a first anode plate, a first cathode plate, and a monovalent anion selective exchange membrane; the first anode plate and the first cathode plate are oppositely arranged, and the monovalent anion selective exchange membrane is attached to the first cathode plate;
the second adsorption unit includes: a second anode plate, a second cathode plate and a monovalent cation selective exchange membrane; the second anode plate and the second cathode plate are oppositely arranged, and the monovalent cation selective exchange membrane is attached to the second anode plate.
3. The system of claim 2, wherein the first anode plate comprises: a first anode, a first anode tab and a first anode current collector; the first anode tab is connected with the first anode; the first anode current collector is attached to the first anode;
the first cathode plate includes: a first cathode, a first cathode tab and a first cathode current collector; the first cathode tab is connected with the first cathode; the first cathodic current collector is attached to the first cathode, and the monovalent anion selective exchange membrane is attached to the first cathodic current collector.
4. The system of claim 2, wherein the second anode plate comprises: a second anode, a second anode tab and a second anode current collector; the second anode tab is connected with the second anode; the second anode current collector is attached to the second anode, and the monovalent cation selective exchange membrane is attached to the second anode current collector;
the second cathode plate includes: the second cathode, the second cathode tab and the second cathode current collector; the second cathode tab is connected with the second cathode; the second cathodic current collector is attached to the second cathode.
5. The system of claim 1, further comprising:
the first regeneration water tank is connected with each first adsorption unit and is used for carrying out desorption regeneration treatment on each first adsorption unit;
and the second regeneration water tank is connected with each second adsorption unit and is used for carrying out desorption regeneration treatment on each second adsorption unit.
6. The system of claim 1, further comprising:
and the fresh water tank is connected with the second outlet end of the electric adsorption device and is used for storing the fresh water.
7. The system of claim 1, further comprising:
and the first water pump is arranged between the outlet end of the raw water tank and the inlet end of the electric adsorption device and is used for conveying the raw wastewater and/or the initial treated water to the electric adsorption device.
8. The system of claim 4, further comprising:
a second water pump for circularly conveying the regeneration water in the first regeneration water tank to each of the first adsorption units and also for discharging the regeneration water in the first regeneration water tank;
and the third water pump is used for circularly conveying the regenerated water in the second regenerated water tank to each second adsorption unit and also used for discharging the regenerated water in the second regenerated water tank.
9. The system of claim 1, further comprising: a first flange hole and a second flange hole;
the first flange hole and the second flange hole are arranged on the electric adsorption device and used for sampling the initial treatment water so as to detect through the detection device.
10. The system of claim 1, wherein the raw wastewater is formed from industrial wastewater that is flocculated, clarified and filtered in sequence and stored in the raw water tank.
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| CN202010896586.XA CN111875007A (en) | 2020-08-31 | 2020-08-31 | Anti-scaling electric adsorption system suitable for high-hardness wastewater |
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| CN202010896586.XA CN111875007A (en) | 2020-08-31 | 2020-08-31 | Anti-scaling electric adsorption system suitable for high-hardness wastewater |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113023846A (en) * | 2021-03-01 | 2021-06-25 | 哈尔滨工业大学 | Small-sized electric adsorption system for drinking underground water treatment and use method thereof |
| CN113149158A (en) * | 2021-03-29 | 2021-07-23 | 河海大学 | System for desalinating brackish water by using pure capacitance deionization technology and method for desalinating brackish water by using system |
-
2020
- 2020-08-31 CN CN202010896586.XA patent/CN111875007A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113023846A (en) * | 2021-03-01 | 2021-06-25 | 哈尔滨工业大学 | Small-sized electric adsorption system for drinking underground water treatment and use method thereof |
| CN113149158A (en) * | 2021-03-29 | 2021-07-23 | 河海大学 | System for desalinating brackish water by using pure capacitance deionization technology and method for desalinating brackish water by using system |
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