CN212151933U - Bipolar membrane electrodialysis device and treatment system for high-salinity wastewater - Google Patents
Bipolar membrane electrodialysis device and treatment system for high-salinity wastewater Download PDFInfo
- Publication number
- CN212151933U CN212151933U CN202020578784.7U CN202020578784U CN212151933U CN 212151933 U CN212151933 U CN 212151933U CN 202020578784 U CN202020578784 U CN 202020578784U CN 212151933 U CN212151933 U CN 212151933U
- Authority
- CN
- China
- Prior art keywords
- chamber
- salt
- bipolar membrane
- communicated
- wastewater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Water Treatment By Electricity Or Magnetism (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The utility model relates to the technical field of high-salinity wastewater treatment, in particular to a bipolar membrane electrodialysis device and a treatment system for high-salinity wastewater, wherein the bipolar membrane electrodialysis device comprises a first salt chamber, a bipolar membrane component, a second salt chamber, an acid chamber and an alkali chamber; the first salt chamber is communicated with the bipolar membrane component; the output end of the bipolar membrane component is connected with the acid chamber and the alkali chamber, and the acid chamber and the alkali chamber are connected in parallel; one end of the second salt chamber is communicated with the bipolar membrane assembly, the other end of the second salt chamber is communicated with the first salt chamber, and a control valve is arranged on a passage through which the first salt chamber is communicated with the second salt chamber. The utility model discloses a bipolar membrane electrodialysis device adopts many salt rooms operation to handle, and invariable concentration feeding and multiple treatment can be realized to same batch waste water, and the device can prepare out the acid-base liquid that concentration and purity are higher under the prerequisite of finite bipolar membrane subassembly, realizes the resourceful treatment of high salt waste water.
Description
Technical Field
The utility model relates to a high salt waste water treatment technical field especially relates to a high salt waste water bipolar membrane electrodialysis device and processing system and method.
Background
At present, the domestic coal-fired power plant, coal chemical industry, metallurgy, steel, petrochemical industry and other industries have more and more mature processes with ultralow emission of flue gas and zero emission of wastewater, but a large amount of industrial wastewater is generated in a plurality of water treatment processes in the fields, and most of the wastewater contains salt components with higher concentration. Saline wastewater generally refers to wastewater having a total dissolved solids of greater than 3.5%, and the presence of Na+、Mg2+、Ca2+、Cl-And the like associated with the process for their production. Therefore, in the industrial wastewater treatment process, most of the problems are faced to treat the high-salinity wastewater, and the industrial saline wastewater is relative to other kindsThe wastewater treatment difficulty is higher, and the problems of low yield, high treatment cost and easy generation of waste byproducts in the resource process exist.
The bipolar membrane is a novel ion exchange composite membrane, which is generally formed by compounding a cation exchange layer, an anion exchange layer and a middle interface hydrophilic layer, charged ions migrate to main body solutions at two sides under the condition of reverse applied voltage, hydrogen ions and hydroxide ions are respectively obtained at two sides of the bipolar membrane, and the hydrogen ions and the hydroxide ions are combined with ions in wastewater to realize the resource treatment of the wastewater. Therefore, with the enhancement of environmental protection, the technology is feasible for treating industrial inorganic salt concentrated water, and has better development and application prospects as an environment-friendly economical technology.
However, in the bipolar membrane electrodialysis device in the prior art, due to the defects of the arrangement of the salt chamber and the bipolar membrane module, the salt chamber cannot continuously supply salt-containing wastewater with constant concentration to the bipolar membrane module, and the utilization rate of the bipolar membrane module is low, so that acid-base solution with higher concentration and purity cannot be obtained. Therefore, with the gradual improvement of the environmental protection requirement, it is necessary to develop a bipolar membrane electrodialysis treatment technology for high-salinity wastewater with strong adaptability and low operation cost against the defects of the conventional bipolar membrane electrodialysis device.
SUMMERY OF THE UTILITY MODEL
The first purpose of the utility model is to provide a bipolar membrane electrodialysis device for high-salinity wastewater, which can realize constant concentration feeding and multiple treatments;
a second object of the utility model is to provide a high salt effluent disposal system, aim at reducing the processing degree of difficulty of high salt waste water, realize the utilization as a resource of high salt waste water.
The utility model provides a bipolar membrane electrodialysis device for high-salinity wastewater, which comprises a first salt chamber, a bipolar membrane component, a second salt chamber, an acid chamber and an alkali chamber; the first salt chamber is communicated with the bipolar membrane component; the output end of the bipolar membrane component is connected with the acid chamber and the alkali chamber, and the acid chamber and the alkali chamber are connected in parallel; one end of the second salt chamber is communicated with the bipolar membrane assembly, the other end of the second salt chamber is communicated with the first salt chamber, and a control valve is arranged on a passage through which the first salt chamber is communicated with the second salt chamber.
The utility model discloses a bipolar membrane electrodialysis device, including bipolar membrane subassembly, first salt room, second salt room, sour room and alkali room, wherein, first salt room, bipolar membrane subassembly and second salt room communicate in proper order, and second salt room and first salt room intercommunication are provided with a control valve on the route of its intercommunication, and sour room, alkali room all communicate with bipolar membrane subassembly. When the device is used for treating high-salinity wastewater, firstly, the control valve is closed, the wastewater in the first salt chamber is conveyed to the bipolar membrane component, the wastewater is continuously supplied to the bipolar membrane component by the first salt chamber at a constant salt concentration, and high-concentration acid-alkali liquor can be obtained after the wastewater is treated by the bipolar membrane component, so that the defect that the salt chamber of the conventional bipolar membrane electrodialysis device cannot continuously supply the wastewater with the salt at the constant concentration to the bipolar membrane component is effectively overcome, the acid-alkali liquor with higher concentration cannot be obtained, the acid-alkali liquor obtained after the treatment of the bipolar membrane component respectively enters the acid chamber and the alkali chamber for storage, and the wastewater treated by the bipolar membrane component is conveyed to the second salt chamber to complete the treatment of a first batch; and then opening a control valve between the first salt chamber and the second salt chamber, pumping all the wastewater in the second salt chamber into the first salt chamber, closing the control valve, simultaneously taking out acid-base liquid in the acid chamber and the alkali chamber, and replacing the acid-base liquid with fresh water initial liquid with the same volume as the wastewater in the first salt chamber, and at the moment, continuously supplying wastewater with constant concentration from the first salt chamber into the bipolar membrane module, and performing second batch treatment by using the bipolar membrane module. According to the process, the wastewater is repeatedly treated for multiple times, and finally the residual wastewater after treatment is discharged from the second salt chamber, so that the first salt chamber can continuously supply the salt-containing wastewater with constant concentration to the bipolar membrane assembly during each treatment, the utilization rate of the bipolar membrane assembly is improved, the acid-alkali liquor with higher concentration and purity is obtained, and the resource utilization of the high-salt wastewater is greatly improved.
Further, the volumes of the acid chamber, the alkali chamber, the first salt chamber and the second salt chamber are the same, and liquid level meters are arranged inside the acid chamber, the alkali chamber, the first salt chamber and the second salt chamber;
and the acid chamber and the alkali chamber are both provided with conductivity meters.
The utility model provides an acid chamber, the volume of alkali chamber and first salt room and second salt room is the same, and inside is provided with the level gauge, before using this device to handle high salt waste water, there is the initial liquid of fresh water with the same volume of first salt room waste water in acid chamber and the alkali chamber, when bipolar membrane subassembly processing waste water, supply waste water to bipolar membrane subassembly by first salt room, supply the initial liquid of fresh water to bipolar membrane subassembly by acid chamber and alkali chamber, from this, bipolar membrane subassembly dissociates and obtains hydrogen ion and hydroxyl ion, through with the combination of cation and anion in the waste water, realize the resourceful treatment of waste water. The conductivity meters arranged on the acid chamber and the alkali chamber can monitor the conductivity of the acid-alkali liquor in real time, and further judge whether the wastewater needs to be treated continuously according to the conductivity of the acid-alkali liquor, so that the wastewater utilization rate is improved, and the wastewater treatment cost is reduced.
Further, the control valve is a one-way valve.
The control valve between the first salt chamber and the second salt chamber is a one-way valve, namely, the wastewater in the second salt chamber can only be conveyed to the first salt chamber, and the wastewater in the first salt chamber cannot flow back to the second salt chamber. Thereby ensuring that the wastewater in the second salt chamber is completely conveyed to the first salt chamber, and the wastewater with constant concentration is continuously supplied to the bipolar membrane assembly from the first salt chamber.
The utility model also discloses a high-salinity wastewater treatment system, which comprises a pretreatment mechanism, a concentration mechanism, a water storage tank and the bipolar membrane electrodialysis device;
the pretreatment mechanism, the concentration mechanism, the water storage tank and the bipolar membrane electrodialysis device are communicated in sequence;
the water storage tank is communicated with the first salt chamber, and a first ball valve is arranged on a communicated passage; the second salt chamber is communicated with the concentration mechanism in the reverse direction, and a second ball valve is arranged on a communicated passage.
The utility model discloses a pretreatment mechanism, concentration mechanism, water storage tank and bipolar membrane electrodialysis device communicate in proper order among high salt effluent disposal system. Therefore, according to the inflow water quality of the wastewater, the pretreatment mechanism carries out treatment such as wastewater hardness reduction, heavy metal ion content reduction, suspended matter removal, pH adjustment and the like on the high-salinity wastewater, so that the pH of the pretreated high-salinity wastewater is adjusted to 7-8, the calcium and magnesium ion content is reduced to be lower than 5ppm, the turbidity is lower than 1NUT, and the follow-up inflow requirement is further met. The concentration mechanism is mainly used for concentrating the high-salinity wastewater so as to further improve the concentration of salt components in the wastewater, so that the concentration of the high-salinity wastewater is higher and the water quality meets the requirements of the bipolar membrane component. The water storage tank is used for storing the wastewater meeting the water inlet requirement of the bipolar membrane electrodialysis device, such as the wastewater meeting the concentration and water quality requirements of high-salt industrial wastewater, and can be directly discharged into the water storage tank without being treated by the pretreatment mechanism and the concentration mechanism. The water storage tank is communicated with the first salt chamber, a first ball valve is arranged on a communicated passage, the second salt chamber is reversely communicated with the concentration mechanism, and a second ball valve is arranged on the communicated passage. When the water storage tank injects water into the first salt chamber, the first ball valve is opened, and after water storage is finished, the first ball valve is closed, so that the concentration of the wastewater in the first salt chamber can be ensured to be constant; the second salt room and the reverse intercommunication of concentrated mechanism, and be provided with the second ball valve on the route of intercommunication, need only open the second ball valve from this after need not to continue to carry out the retreatment to waste water, directly arrange waste water to concentrated mechanism, further concentrated the back to waste water by concentrated mechanism, the above-mentioned processing procedure of repetition again can. The utility model discloses a high salt effluent disposal system, through pretreatment mechanism, concentrated mechanism, cistern and bipolar membrane electrodialysis device's combination, can be with waste water with invariable salt concentration to bipolar membrane electrodialysis device supply waste water, effectively improved the acid-base conversion rate of high salt effluent to improve the treatment system utilization ratio, reduced the treatment cost of high salt effluent.
Further, the device also comprises a buffer pool, wherein the buffer pool is arranged on a passage between the second ball valve and the concentration mechanism;
the alkali chamber is communicated with the buffer tank, and a third ball valve is arranged on a communicated passage.
The utility model discloses a high salt effluent disposal system still includes the buffer pool, and the buffer pool setting is on the route between second ball valve and concentrated mechanism to alkali chamber and buffer pool intercommunication. The wastewater after being treated by the bipolar membrane component for many times is acidic, so that a buffer pool is arranged between the second salt chamber and the concentration mechanism and used for adjusting the pH value of the wastewater, the buffer pool is communicated with the alkali chamber, alkali liquor recovered from the alkali chamber can be directly used for the buffer pool, and when the pH value of the wastewater in the buffer pool is stabilized at 7-8, the wastewater in the buffer pool is pumped into the concentration mechanism to be further concentrated and the steps are repeated.
Further, the pretreatment mechanism comprises a reaction tank, an ultrafiltration device and ion exchange resin;
the reaction tank, the ultrafiltration device and the ion exchange resin are communicated in sequence;
the ion exchange resin is in communication with the concentration mechanism.
The reaction tank, the ultrafiltration device and the ion exchange resin in the pretreatment mechanism are sequentially communicated, and an alkaline reagent, a heavy metal chelating agent and a flocculating agent are sequentially added into the reaction tank to respectively adjust the pH value of the wastewater, remove heavy metal ions and reduce solid suspended matters in the wastewater; the ultrafiltration membrane in the ultrafiltration device only allows the solvent (such as water molecules), inorganic salt and small molecular organic matters in the solution to permeate, but intercepts the suspended substances, colloid, protein, microorganisms and other macromolecular substances in the solution, thereby achieving the purposes of purification and separation; the ion exchange resin can further reduce the hardness of the wastewater and the content of heavy metal impurities. The high-salinity wastewater is sequentially treated by the reaction tank, the ultrafiltration device and the ion exchange resin in the pretreatment mechanism, so that the utilization rate of the pretreatment mechanism can be improved, and the water quality of the wastewater can meet the water inlet requirement of the subsequent process.
Further, the concentration mechanism is any one of a reverse osmosis device, a homogeneous membrane electrodialysis device or a membrane distillation device.
The utility model discloses a concentrated mechanism can use reverse osmosis unit, homogeneous phase membrane electrodialysis device or membrane distillation plant, specifically can select concentrated setting according to the concentration of required acid-base product.
The utility model also discloses a high salt waste water's processing method, including following step:
s1, adjusting the pH value of the high-salinity wastewater to 7-8, reducing the content of calcium and magnesium in the wastewater to be less than 5ppm and reducing the turbidity to be less than 1 NUT;
s2, concentrating the high-salinity wastewater until the mass concentration of salt components is 7-20%;
s3, conveying the concentrated wastewater to a bipolar membrane assembly from a first salt chamber, respectively allowing acid liquor and alkali liquor obtained by treatment of the bipolar membrane assembly to enter the acid chamber and the alkali chamber, and pumping the wastewater treated by the bipolar membrane assembly into a second salt chamber to finish first batch treatment;
s4, opening the control valve, pumping the wastewater in the second salt chamber into the first salt chamber, closing the control valve, conveying the wastewater from the first salt chamber to the bipolar membrane module, and repeating the step S3;
s5, when the concentration of the acid liquor in the acid chamber or the alkali liquor in the alkali chamber is less than or equal to 2.5%, closing the control valve, concentrating the wastewater in the second salt chamber, and repeating the steps S2, S3, S4 and S5.
The utility model discloses a high salt waste water treatment method, including following steps, firstly, adjust the pH of high salt waste water to 7-8, and reduce calcium magnesium content in the waste water to below 5ppm, the turbidity falls to below 1NUT, the process of preliminary treatment can be adjusted the quality of water of high salt waste water to satisfy the requirement of intaking of bipolar membrane electrodialysis device, and then improve the efficiency that bipolar membrane electrodialysis device handled the waste water; then, the high-salinity wastewater is concentrated until the mass concentration of the salt components is 7-20%, and researches show that when the mass concentration of the salt components in the wastewater is 7-20%, the bipolar membrane electrodialysis device has high dissociation rate, and the concentration of the generated acid and alkali liquor is high, so that the resource utilization rate of the wastewater can be improved; performing bipolar membrane electrodialysis on the concentrated wastewater, namely firstly, continuously conveying the concentrated wastewater with constant salt concentration to a bipolar membrane assembly from a first salt chamber, respectively feeding acid liquor and alkali liquor obtained by treatment of the bipolar membrane assembly into an acid chamber and an alkali chamber, and pumping the wastewater treated by the bipolar membrane assembly into a second salt chamber to finish first batch treatment; then, the wastewater in the second salt chamber is pumped into the first salt chamber, and the wastewater with constant salt concentration is continuously delivered to the bipolar membrane assembly from the first salt chamber, and the treatment process is repeated. And finally, when the concentration of the acid liquor in the acid chamber or the alkali liquor in the alkali chamber is less than or equal to 2.5 percent, if the bipolar membrane component is continuously used for treating, the dissociation rate is reduced, the equipment utilization rate is reduced, and the treatment cost is increased, so that the steps are carried out after the wastewater in the second salt chamber is concentrated. To sum up, the utility model discloses a high salt waste water treatment method strong adaptability, running cost are low, can realize the resourceful treatment of high salt waste water.
Further, step S3 includes, after the acid solution and the alkali solution obtained by the bipolar membrane module processing respectively enter the acid chamber and the alkali chamber, taking out the acid solution in the acid chamber and the alkali solution in the alkali chamber, and replacing the acid solution and the alkali solution with fresh water initial solution, thereby completing the first batch processing.
The utility model discloses a step S3 still includes, treat that acidizing fluid and alkali lye that obtains through bipolar membrane module processing get into acid chamber and alkali chamber respectively after, take out acidizing fluid and alkali lye in the acid chamber to change the fresh water initial solution with first salt room waste water voluminous, use next time acid chamber and alkali chamber to provide the fresh water of required dissociation for bipolar membrane module, realize bipolar membrane module processing process' S circulation.
Further, step S5 specifically includes: and when the concentration of the acid liquor in the acid chamber or the alkali liquor in the alkali chamber is less than or equal to 2.5%, closing the control valve, discharging the wastewater in the second salt chamber into the buffer pool, adjusting the pH of the wastewater to 7-8, and then repeating the steps S2, S3, S4 and S5.
Research shows that when the concentration of the acid liquid in the acid chamber or the alkali liquid in the alkali chamber is less than or equal to 2.5 percent, namely the conductivity of the acid liquid in the acid chamber is less than 250ms/cm or the conductivity of the alkali liquid in the alkali chamber is less than 130ms/cm, the utilization rate of salt components of the wastewater is reduced, and the use cost of equipment is only increased by continuously using the bipolar membrane module for treatment, so that the wastewater in the second salt chamber can be discharged to a buffer pool at the moment, the pH of the wastewater is adjusted to 7-8 by the buffer pool, and then the steps S2, S3, S4 and S5 are repeated.
The utility model discloses a bipolar membrane electrodialysis device of high salt waste water compares with prior art, has following technological effect:
the utility model discloses a bipolar membrane electrodialysis device includes bipolar membrane subassembly, first salt room, the second salt room, sour room and alkali chamber, waste water in the first salt room provides the raw materials to bipolar membrane subassembly with invariable concentration, waste water produces acidizing fluid and alkali lye under bipolar membrane subassembly's effect, acidizing fluid and alkali lye are carried respectively to sour room and alkali chamber and are stored, and the waste water pump after bipolar membrane subassembly is handled goes into the second salt room, through the regulating control valve, carry the waste water in the second salt room to first salt room, then close the control valve, continue to provide the waste water of invariable concentration to bipolar membrane subassembly by first salt room, repeated above-mentioned processing. The utility model discloses a bipolar membrane electrodialysis device adopts many salt rooms operation to handle, and invariable concentration feeding and multiple treatment can be realized to same batch waste water, under the prerequisite of limited bipolar membrane subassembly, can prepare out the acid-base liquid that concentration and purity are higher, realizes the resourceful treatment of high salt waste water.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a bipolar membrane electrodialysis device for high-salinity wastewater of the present invention;
FIG. 2 is a schematic view of the high salinity wastewater treatment system of the present invention;
fig. 3 is a schematic view of the pretreatment mechanism of the present invention.
Description of reference numerals:
1: a first salt compartment; 2: a bipolar membrane module; 3: a second salt chamber; 4: an acid chamber; 5: an alkali chamber; 6: a liquid level meter; 7: a conductivity meter; 8: a one-way valve; 9: a pretreatment mechanism; 10: a concentration mechanism; 11: a water storage tank; 12: a first ball valve; 13: a second ball valve; 14: a buffer pool; 15: a third ball valve; 16: a reaction tank; 17: an ultrafiltration device; 18: ion exchange resins.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the bipolar membrane electrodialysis device for high-salinity wastewater of the present invention comprises a first salt chamber 1, a bipolar membrane module 2, a second salt chamber 3, an acid chamber 4 and an alkali chamber 5; the first salt chamber 1 is communicated with the bipolar membrane module 2; the output end of the bipolar membrane module 2 is connected with the acid chamber 4 and the alkali chamber 5, and the acid chamber 4 and the alkali chamber 5 are connected in parallel; one end of the second salt chamber 3 is communicated with the bipolar membrane assembly 2, the other end of the second salt chamber is communicated with the first salt chamber 1, and a control valve is arranged on a passage through which the first salt chamber 1 is communicated with the second salt chamber 3.
The utility model discloses an among the bipolar membrane electrodialysis device of high salt waste water, first salt room 1, bipolar membrane subassembly 2 and second salt room 3 communicate in proper order, waste water in first salt room 1 can invariable salt concentration provide waste water raw materials to bipolar membrane subassembly 2, acidizing fluid and alkali lye that produce after bipolar membrane subassembly 2 handles get into acid chamber 4 and alkali chamber 5 respectively, and waste water after bipolar membrane subassembly 2 handles is carried to second salt room 3, second salt room 3 and first salt room 1 intercommunication, and be provided with a control valve on the route of intercommunication, the back is opened to the control valve, the waste water of second salt room 3 can be gone into first salt room 1 by the pump, so that the waste water after will handling is again provided the waste water raw materials to bipolar membrane subassembly 2 with invariable salt concentration by first salt room 1, the device can be to high salt waste water cyclic processing many times in proper order, finally realize the utilization of high salt waste water as a resource. In addition, the acid chamber 4 and the alkali chamber 5 are both communicated with the bipolar membrane component 2, so that acid-alkali liquid generated by dissociation of the bipolar membrane component 2 respectively enters the acid chamber 4 and the alkali chamber 5, before next cycle treatment, the acid-alkali liquid in the acid chamber 4 and the alkali chamber 5 needs to be taken out and replaced by fresh water initial liquid with the same volume as the wastewater in the first salt chamber 1, the acid chamber 4 and the alkali chamber 5 provide fresh water initial liquid for the bipolar membrane component 2 at the initial wastewater treatment stage of the bipolar membrane component 2, the fresh water initial liquid is dissociated into hydrogen ions and hydroxyl ions, and the hydrogen ions and the hydroxyl ions are combined with cations and anions in the high-salt wastewater to obtain the acid liquid and the alkali liquid.
On the basis of the technical scheme, the volumes of the acid chamber 4, the alkali chamber 5, the first salt chamber 1 and the second salt chamber 3 are the same, and liquid level meters 6 are arranged inside the acid chamber, the alkali chamber, the first salt chamber and the second salt chamber; and the acid chamber 4 and the alkali chamber 5 are both provided with a conductivity meter 7.
The utility model discloses an acid chamber 4, alkali chamber 5, first salt room 1 and second salt room 3's volume is the same to inside is provided with level gauge 6, before the device handled waste water, acid-alkali chamber 5 and first salt room 1 had the initial liquid of fresh water and the high salt waste water of the same volume respectively, during the processing, high salt waste water and the initial liquid of fresh water all were carried to bipolar membrane module 2, but the liquid volume of level gauge 6 real-time supervision acid chamber 4, alkali chamber 5, first salt room 1 and second salt room 3. In addition, the acid chamber 4 and the alkali chamber 5 are both provided with a conductivity meter 7, a probe of the conductivity meter 7 is submerged in liquid, a control panel of the conductivity meter can be arranged on the outer wall of the acid-alkali chamber 5, the concentration value of the acid-alkali liquid can be monitored in real time through the arrangement of the conductivity, and then whether the wastewater needs to be repeatedly treated is judged.
On the basis of the above technical solution, preferably, the control valve is a check valve 8.
The control valve between the first salt chamber 1 and the second salt chamber 3 is a one-way valve 8, i.e. the waste water of the second salt chamber 3 can only be transported to the first salt chamber 1, while the waste water of the first salt chamber 1 cannot overflow to the second salt chamber 3.
As shown in fig. 2-3, the high-salinity wastewater treatment system of the present invention comprises a pretreatment mechanism 9, a concentration mechanism 10, a water storage tank 11 and the bipolar membrane electrodialysis device; the pretreatment mechanism 9, the concentration mechanism 10, the water storage tank 11 and the bipolar membrane electrodialysis device are communicated in sequence; wherein the water storage tank 11 is communicated with the first salt chamber 1, and a first ball valve 12 is arranged on a communicated passage; the second salt chamber 3 is reversely communicated with the concentration mechanism 10, and a second ball valve 13 is arranged on a communicated passage.
The utility model also discloses a high-salinity wastewater treatment system, which comprises a pretreatment mechanism 9, a concentration mechanism 10, a water storage tank 11 and the bipolar membrane electrodialysis device, wherein the pretreatment mechanism 9 can preliminarily reduce the hardness of wastewater, reduce the content of heavy metal ions and remove solid suspended matters in the wastewater so as to meet the subsequent water inlet requirement; the concentration mechanism 10 can further improve the concentration of salt components in the wastewater so as to meet the water inlet requirement of the bipolar membrane electrodialysis device; the water storage tank 11 is used for storing the wastewater treated by the pretreatment mechanism 9 and the concentration mechanism 10, such as industrial high-salinity wastewater with high concentration and water quality meeting the treatment requirements of the bipolar membrane electrodialysis device, and can be used without pretreatment and concentration. The water storage tank 11 is communicated with the first salt chamber 1 and used for supplying wastewater to be treated to the first salt chamber 1, and the second salt chamber 3 is reversely communicated with the concentration mechanism 10 and used for further concentrating the low-concentration saline wastewater treated by the bipolar membrane component 2.
On the basis of the technical scheme, the water storage tank 11 is further provided with an online pH monitor and a conductivity meter 7. The conductivity meter 7 is arranged to monitor the concentration of the salt component of the high-salinity wastewater in the water storage tank 11 in real time.
On the basis of the above technical solution, the apparatus further comprises a buffer tank 14, wherein the buffer tank 14 is arranged on a passage between the second ball valve 13 and the concentration mechanism 10; the alkali chamber 5 is communicated with the buffer tank 14, and a third ball valve 15 is arranged on a communicated passage.
In order to monitor the pH value of the wastewater in real time, a dosing component and a pH on-line monitor are arranged on the buffer tank 14.
On the basis of the above technical solution, preferably, the pretreatment mechanism 9 comprises a reaction tank 16, an ultrafiltration device 17 and an ion exchange resin 18; the reaction tank 16, the ultrafiltration device 17 and the ion exchange resin 18 are communicated in sequence; the ion exchange resin 18 is in communication with the concentration mechanism 10.
In order to adjust the quality of the wastewater, the pretreatment mechanism 9 comprises a reaction tank 16, an ultrafiltration device 17 and ion exchange resin 18, after the high-salinity wastewater is sequentially treated by the reaction tank 16, the ultrafiltration device 17 and the ion exchange resin 18, the pH value of the wastewater can be adjusted to 7-8, the content of calcium and magnesium ions is reduced to 5ppm, the turbidity is less than 1NUT, and the wastewater with the quality can meet the treatment requirements of a bipolar membrane electrodialysis device, so that the wastewater treatment efficiency is improved.
Based on the above preferred technical solution, more preferably, the concentration device 10 is any one of a reverse osmosis device, a homogeneous membrane electrodialysis device, or a membrane distillation device.
Any one of a reverse osmosis device, a homogeneous membrane electrodialysis device or a membrane distillation device can be selected according to the concentration requirement of the subsequent acid-base product.
The high-salinity wastewater treatment system in the preferable technical scheme is used for treating the saline wastewater of a certain factory, the salt content in the wastewater is about 4 percent, and the method comprises the following specific steps:
s1, adding 3% alkali liquor into the salt-containing wastewater to adjust the pH of the wastewater to about 8, introducing the salt-containing wastewater into sodium ion exchange resin 18 to reduce the calcium and magnesium content to 3ppm, and further introducing the wastewater into adsorption chelate resin to perform deep softening and heavy ion content reduction treatment, wherein the filler of the adsorption chelate resin is CH-90, the filler expansion rate is 30-35%, and the flow rate is controlled at 7-10 m/h.
S2, pumping the pretreated salt-containing wastewater into a vacuum membrane distillation device, wherein the membrane module uses a polyvinylidene fluoride hollow fiber membrane, the inlet water temperature is 60-70 ℃, the vacuum degree is-0.09 atm, the desalination rate is 99.5%, and the membrane flux is 8-13L/(m3H), the mass concentration of the salt component in the treated wastewater is 15%.
S3, closing the first ball valve 12, and pumping the salt-containing wastewater subjected to vacuum membrane distillation treatment into a water storage tank 11, wherein the volume of the water storage tank 11 used in the embodiment is 30m3The state of the saline wastewater is monitored by a pH on-line monitor and a conductivity meter 7 in the water storage tank 11, so that the pH and the conductivity of the saline wastewater are respectively stabilized at 7-9 and 150-190 ms/cm. The first ball valve 12 is opened, the salt-containing wastewater in the water storage tank 11 is pumped into the first salt chamber 1, and the volume of the first salt chamber 1 and the volume of the second salt chamber 3 are both 10m3And after the first salt chamber 1 is filled with the wastewater, the first ball valve 12 is closed. The salt-containing wastewater in the first salt chamber 1 is pumped into the bipolar membrane component 2 by a magnetic pump to prepare acid-base liquid. The bipolar membrane component 2 is a novel ion exchange membrane, and the flow entering the bipolar membrane component 2 is 7m3The initial liquid volumes of the acid chamber 4 and the alkali chamber 5 are respectively set to be 10m in initial operation3The electrode solution is 3% sodium hydroxide solution.
S4, after the wastewater in the first salt chamber 1 is treated, opening the one-way valve 8, pumping the wastewater in the second salt chamber 3 after reaction into the first salt chamber 1, closing the one-way valve 8 after the reaction is filled, and continuously providing the saline wastewater to the bipolar membrane assembly 2 from the first salt chamber 1 to carry out bipolar membrane electrodialysis treatment. Before the first salt chamber 1 supplies water to the bipolar membrane component 2, the acid-base liquid in the acid-base chamber 5 is taken out and stored in a polytetrafluoroethylene container tank for later use, and is replaced by fresh water initial liquid.
S5, after the salt-containing wastewater is treated for 6-9 times by the method, the batch wastewater treatment is stopped until the conductivity of the acid liquor in the acid chamber 4 is 235 ms/cm. Discharging the residual weak brine which is subjected to multi-batch treatment by the bipolar membrane electrodialysis device into a second brine chamber 3, closing a one-way valve 8, opening a second ball valve 13, pumping the wastewater in the second brine chamber 3 into a buffer tank 14, opening a third ball valve 15, adjusting the pH value of the wastewater in the buffer tank 14 to 8 by using alkali liquor generated by the bipolar membrane electrodialysis device as a medicament, and pumping the wastewater into a concentration mechanism 10 for reuse.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (9)
1. The bipolar membrane electrodialysis device for the high-salinity wastewater is characterized by comprising a first salt chamber (1), a bipolar membrane assembly (2), a second salt chamber (3), an acid chamber (4) and an alkali chamber (5);
the first salt chamber (1) is communicated with the bipolar membrane component (2); the output end of the bipolar membrane module (2) is connected with the acid chamber (4) and the alkali chamber (5), and the acid chamber (4) and the alkali chamber (5) are connected in parallel;
one end of the second salt chamber (3) is communicated with the bipolar membrane component (2), the other end of the second salt chamber is communicated with the first salt chamber (1), and a control valve is arranged on a passage for communicating the first salt chamber (1) with the second salt chamber (3).
2. The bipolar membrane electrodialysis device according to claim 1, wherein the volumes of the acid compartment (4), the base compartment (5), the first salt compartment (1) and the second salt compartment (3) are the same, and a liquid level meter (6) is disposed inside;
and the acid chamber (4) and the alkali chamber (5) are both provided with a conductivity meter (7).
3. The bipolar membrane electrodialysis device according to claim 1, wherein the control valve is a one-way valve (8).
4. A high-salinity wastewater treatment system, characterized by comprising a pretreatment mechanism (9), a concentration mechanism (10), a water storage tank (11) and the bipolar membrane electrodialysis device according to any one of claims 1 to 3;
the pretreatment mechanism (9), the concentration mechanism (10), the water storage tank (11) and the bipolar membrane electrodialysis device are communicated in sequence;
wherein the water storage tank (11) is communicated with the first salt chamber (1), and a first ball valve (12) is arranged on a communicated passage; the second salt chamber (3) is reversely communicated with the concentration mechanism (10), and a second ball valve (13) is arranged on a communicated passage.
5. The treatment system according to claim 4, further comprising a buffer tank (14), said buffer tank (14) being provided on a passage between said second ball valve (13) and said thickening means (10);
the alkali chamber (5) is communicated with the buffer pool (14), and a third ball valve (15) is arranged on a communicated passage.
6. The treatment system according to claim 4, wherein the pre-treatment means (9) comprises a reaction tank (16), an ultrafiltration device (17) and an ion exchange resin (18);
the reaction tank (16), the ultrafiltration device (17) and the ion exchange resin (18) are communicated in sequence;
the ion exchange resin (18) is in communication with the concentration mechanism (10).
7. The treatment system according to claim 4, wherein the concentration means (10) is any one of a reverse osmosis unit, a homogeneous membrane electrodialysis unit or a membrane distillation unit.
8. Treatment system according to claim 4, characterized in that the water reservoir (11) is provided with an on-line pH monitor and a conductivity meter (7).
9. The treatment system according to claim 5, wherein the buffer tank (14) is provided with an administration component and an on-line pH monitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020578784.7U CN212151933U (en) | 2020-04-17 | 2020-04-17 | Bipolar membrane electrodialysis device and treatment system for high-salinity wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020578784.7U CN212151933U (en) | 2020-04-17 | 2020-04-17 | Bipolar membrane electrodialysis device and treatment system for high-salinity wastewater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212151933U true CN212151933U (en) | 2020-12-15 |
Family
ID=73720412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020578784.7U Active CN212151933U (en) | 2020-04-17 | 2020-04-17 | Bipolar membrane electrodialysis device and treatment system for high-salinity wastewater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212151933U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111410344A (en) * | 2020-04-17 | 2020-07-14 | 大唐环境产业集团股份有限公司 | High-salinity wastewater bipolar membrane electrodialysis device, treatment system and treatment method |
-
2020
- 2020-04-17 CN CN202020578784.7U patent/CN212151933U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111410344A (en) * | 2020-04-17 | 2020-07-14 | 大唐环境产业集团股份有限公司 | High-salinity wastewater bipolar membrane electrodialysis device, treatment system and treatment method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104445755B (en) | A kind of method for ammonium chloride waste-water recycling treatment | |
| CN111410344A (en) | High-salinity wastewater bipolar membrane electrodialysis device, treatment system and treatment method | |
| CN105565569A (en) | Intensified deep concentration system for high-salt-content industrial wastewater and technology thereof | |
| CN104291416A (en) | Low energy system and method of desalinating seawater | |
| CN212403781U (en) | But resource recovery's desulfurization effluent disposal system | |
| JPH0579397B2 (en) | ||
| CN111268834A (en) | Desulfurization wastewater treatment system and method capable of recycling resources | |
| CN111954568B (en) | Saline water recovery system based on bipolar membrane | |
| CN101007663A (en) | Electrodeionization water-purifying device and method for recovering cation and anion without scaling | |
| CN109248565B (en) | Saline water recovery system based on bipolar membrane | |
| CN105198133A (en) | Ultra-pure water preparation system and method capable of preventing electrodeionization device from scaling | |
| CN205603386U (en) | Strong brine zero release membrane concentrator | |
| CN101694007B (en) | Treatment method of electroplating rinsewater | |
| CN106365274A (en) | Technological device and technological method for carrying out desalting treatment on underground water by using electrically-driven ionic membrane | |
| CN106966536A (en) | Strong brine zero-emission film concentration technology and equipment | |
| CN110902898B (en) | Device and method for removing nitrogen and phosphorus in sewage by magnesium anode electrodialysis method | |
| CN212151933U (en) | Bipolar membrane electrodialysis device and treatment system for high-salinity wastewater | |
| CN201021439Y (en) | An antiscaling electric ion removal and cleaning device and recycling negative ion and positive ion | |
| CN110304695A (en) | A kind of reclaiming system and method for the high fluorine waste water of high phosphorus | |
| CN114014415A (en) | Continuous regeneration deionization cation exchanger and anion exchanger system by using direct-current power supply | |
| JP3952127B2 (en) | Electrodeionization treatment method | |
| CN115124118B (en) | Thiadiazole production wastewater treatment method | |
| CN113522373B (en) | Method for removing inorganic salt in mannose mother liquor by using ionic resin | |
| CN216614124U (en) | Continuous regeneration deionization cation exchanger and anion exchanger system by using direct-current power supply | |
| CN210122533U (en) | Processing system who contains salt waste water |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |