CN218290688U

CN218290688U - Electrodialysis desalination device for high-concentration wastewater

Info

Publication number: CN218290688U
Application number: CN202222973092.4U
Authority: CN
Inventors: 万智欣; 肖宏雁; 杨佳; 王小强; 黄冬根
Original assignee: Xinqi'an Polytron Technologies Inc; Nanchang Hangkong University
Current assignee: Xinqi'an Polytron Technologies Inc; Nanchang Hangkong University
Priority date: 2022-11-09
Filing date: 2022-11-09
Publication date: 2023-01-13
Anticipated expiration: 2032-11-09

Abstract

The utility model relates to an electrodialysis desalination device for high concentration wastewater, wherein the bottom of a polar plate in the electrodialysis device is connected with a water distribution pipe, the water distribution pipe is provided with a plurality of liquid inlets, the liquid inlets are tightly attached to the bottom plate surface of the polar plate, and the pipe orifices are upward; the polar plate is over against the liquid inlets, the two inclined plates form a roof structure at the top end of the electrode chamber, and the middle position of the roof structure is connected with a polar liquid return pipe. Compared with the traditional electrodialysis, the device is additionally provided with the water distribution device for the electrode liquid to enter water and the polar plate bubble discharge device, so that the electrode liquid can uniformly scour the polar plates when passing through the cathode and the anode and then is converged into the membrane stack or discharged, thereby not only increasing the contact area of the electrode reaction and timely discharging bubbles on the polar plates, preventing the corrosion of gas generated by the electrolysis reaction on the polar plates, but also timely washing away the generated precipitate and preventing the scaling of the polar plates; the service life of the polar plate is longer, the subsequent operation cost is relatively lower, pollutants which are difficult to treat are not generated in the process of treating the wastewater, and the emission of the pollutants is greatly reduced.

Description

Electrodialysis desalination device for high-concentration wastewater

Technical Field

The utility model relates to a sewage treatment device field especially relates to a high enriched waste water electrodialysis desalination device.

Background

At present, two methods are commonly used for treating high-concentration wastewater, namely a distillation desalting method and a membrane method for treating high-salt wastewater, wherein the distillation desalting method has low requirement on water inlet, but equipment is easy to scale and is easy to corrode. A large amount of heat is consumed for evaporation, and the consumed steam amount is high; the equipment is seriously corroded in the running process, the service life is short, and the running cost of wastewater treatment is high; the mother liquor needs to be further treated after being treated by the system. A method for separating different solutes in a solution by using the permselectivity of a membrane is called dialysis, and when an electric field is applied to two sides of a membrane stack, charged solute particles migrate under the action of the electric field force, which is called electrodialysis; the membrane treatment method has good water quality of produced water, but has high requirement on inlet water, too high salinity and high organic matter content, and greatly reduces the service life of the membrane, so that the salinity and the organic matter content need to be reduced as much as possible in the pretreatment; at present, in the prior art, when the electrodialysis device works, impurities can be adhered to the surface of a membrane, the efficiency of electrodialysis is reduced after long-term operation, the desalting effect is influenced,

after the electrodialysis instrument is electrified, the surface of the electrode plate generates electrochemical reaction, and nascent oxygen [ O ] is arranged at the anode]And H ₂ The polar liquid is acidic and has strong oxidation action, so that the polar plate is corroded, a large number of bubbles are gathered on the polar plate, the bubbles which are washed down along with the circulation of the liquid do not exist, the electrode reaction is influenced, the contact area of the reaction is reduced, the corrosion of the polar plate is caused to a certain extent, and the polar liquid at the cathode is alkaline. When the electrodialysis instrument is used for a long time, ca exists in the water ²⁺ 、Mg ²⁺ And HCO ^3- When present, caCO is produced ₃ And Mg (OH) ₂ The scale deposition of the electrode liquid, whether the electrode liquid is acid-base or the electrode plate is scaled, influences the electrode reaction to a great extent and reduces the service life of an electrodialysis instrument; the membrane technology is used for treating high-concentration wastewater, the equipment is expensive, easy to block and easy to pollute, concentrated solution cannot be treated, and membrane pollution and cleaning are problems which puzzle the membrane technology for many years.

Chinese patent application "a high salt waste water resourceful treatment method" (201410659045X), "a high concentration high salt waste water comprehensive treatment technology" (201510480899.6) all carry out preliminary treatment filtration to waste water, adopt quartz sand or active carbon filtration absorption suspended solid and organic matter, but as independent preprocessing device make whole equipment volume increase, do not all propose better solution to the incrustation scale deposit in the prior art simultaneously.

Disclosure of Invention

The utility model provides a high-concentration wastewater electrodialysis desalination device, wherein an electrode chamber is used for feeding water through a water distribution device tightly attached to a polar plate to wash the polar plate, and a polar liquid return pipe is connected to the middle position of a roof-shaped structure at the top end of the electrode chamber, so that bubbles generated by reaction can be gathered together with water flow to be discharged, and the polar plate is protected and the electrodialysis reaction is promoted to be carried out; through simplifying filter equipment into filter sieve screen and arranging in the desalination chamber, can filter to get rid of among most suspended solid and the high enriched waste water simply high-efficiently and can get into among the electrodialysis device after the part organic matter, can not only prevent that the polar plate from corroding and the membrane stack scale deposit, can also prolong the life of device, reduced the occupation of land space of whole set of device, reduce the emission of pollutant, reduce the treatment cost of enterprise, reduce the environmental protection pressure of enterprise.

The utility model provides a high enriched waste water electrodialysis desalination device, includes electrodialysis device, desalination chamber, concentration chamber and utmost point liquid room all form circulation circuit respectively through feed liquor pipe and back flow with the electrodialysis device, the one end of electrodialysis device is the anode chamber, and the other end is the cathode chamber, has arranged the polar plate in anode chamber and the cathode chamber, the bottom of anode chamber and cathode chamber all is provided with utmost point liquid feed liquor pipe, and the top of anode chamber and cathode chamber is provided with utmost point liquid back flow, its characterized in that: the bottom of the polar plate is connected with a water distribution pipe, the water distribution pipe is communicated with a polar liquid inlet pipe, the water distribution pipe is provided with a plurality of liquid inlets, the liquid inlets are tightly attached to the bottom plate surface of the polar plate, and the pipe orifices are upward; two inclined plates are fixed above the polar plates opposite to the liquid inlets, and the two inclined plates form a roof-shaped structure at the top end of the polar chamber.

The polar liquid return pipe is connected to the middle position of a roof shape formed by the two inclined plates.

The bottom outside the desalting chamber is connected with a wastewater inlet pipeline, and the bottom inside the desalting chamber is provided with a filtering and screening net.

The filler of the filtering and screening net is active carbon.

The utility model discloses the device is compared with traditional electrodialysis, the water distribution device (water distributor) and the polar plate gassing device (the roof column structure that two swash plates constitute at the electrode compartment top) that the utmost point liquid intake have been increased, make the utmost point liquid can be even when passing through negative pole positive pole erode the plate electrode, remittance membrane pile in or along with rivers discharge again, the area of contact of electrode reaction has not only been increased like this, in time get rid of the bubble on the polar plate, prevent the gaseous corruption to the polar plate that electrode reaction produced, the deposit that also can be timely will generate washes away, prevent the polar plate scale deposit.

Simultaneously the utility model discloses increased and carried out filterable filter equipment to high enriched waste water: there is the filtration screening net on desalination chamber inlet one side, and the material is active carbon, and inside high concentration waste water got into the electrodialysis membrane stack from the desalination chamber, was blocked outside large-scale particle impurity on the one hand, and on the other hand adsorbs the organic matter in the high concentration salt solution, prevents it from causing corruption or jam to ion exchange membrane, sets up the filtration screening net in the desalination chamber, need not add filter equipment in addition, has reduced the occupation of land space of whole set of device, has reduced investment cost.

Most of the components of the utility model are acrylic plates which can resist the corrosion of high-salt wastewater, and the whole material is not easy to damage and age; compared with the device used by the traditional treatment method, the device has the advantages that the water inlet pretreatment step is simple, the cleaning is easy, the device is more durable, the service life of the electrode is longer due to the addition of the water distribution device and the partition plate, the subsequent operation cost is relatively low, and the occupied area of the device is small; in the process of treating the wastewater, pollutants which are difficult to treat are not additionally generated, and the emission of the pollutants is greatly reduced.

Drawings

Figure 1 is a schematic structural diagram of the present invention,

FIG. 2 is a schematic diagram of the structure of an anode (cathode) chamber,

FIG. 3 is a partial structural view of the top of the anode (cathode) chamber,

figure 4 is a schematic view of a roof structure of a polar room,

the various reference numbers in the figures are listed below:

1-an electrodialysis device, 2-a desalting chamber, 3-a concentration chamber, 4-an electrode liquid chamber, 11-a cathode chamber, 12-an anode chamber, 13-an electrode plate, 14-an electrode liquid inlet pipe, 15-an electrode liquid return pipe, 16-an inclined plate, 17-a liquid inlet, 21-a filtering and screening net, 22-a wastewater inlet pipe, 23-a fresh water outlet pipe, 31-a pure water pipe and 32-a concentrated water outlet pipe.

The arrows in the figure are the pipes or the flow direction.

Detailed Description

As shown in fig. 1-4, the utility model discloses a high enriched waste water electrodialysis desalination device, including electrodialysis device 1, desalination chamber 2, concentration chamber 3 and polar liquid chamber 4, electrodialysis device 1 is used for desalting high enriched waste water, desalination chamber 2 is used for storing desalination liquid, and the intercommunication has waste water inlet pipe 22 and fresh water outlet pipe 23, concentration chamber 3 is used for receiving the concentrate and is connected with pure water pipeline 31 and concentrated water outlet pipe 32, and is used for storing polar liquid chamber 4 of polar liquid, and in this embodiment, polar liquid chamber 4 is equipped with a negative pole and positive pole, communicates with cathode chamber 11 and anode chamber 12 of electrodialysis device respectively; the desalting chamber 2, the concentration chamber 3 and the polar liquid chamber 4 and the electrodialysis device 1 form circulation loops respectively through a liquid inlet pipe and a return pipe to respectively form a desalting liquid circulation system, a concentrated liquid circulation system, an anolyte circulation system and a catholyte circulation system; wherein anolyte and catholyte circulation system are connected with the anolyte chamber 4, the concentrated solution circulation system is connected with the concentration chamber 3, the desalination solution circulation system is connected with the desalination chamber 2, and the high-concentration wastewater is clarified and desalted through the electrodialysis device 1.

The one end of electrodialysis device 1 is anode chamber 12, and the other end is cathode chamber 11, and

anode chamber

12 and 11 indoor polar plates 13 that have arranged of negative pole, the bottom of anode chamber 12 and cathode chamber 11 all is provided with utmost point liquid feed liquor pipe 14, and the top of anode chamber 12 and cathode chamber 11 is provided with utmost point liquid back flow 15, its characterized in that: the bottom of the polar plate 13 is connected with a water distribution pipe (not shown), the water distribution pipe is communicated with a polar liquid inlet pipe 14, a plurality of liquid inlets 17 are formed in the water distribution pipe, the liquid inlets 17 are tightly attached to the bottom plate surface of the polar plate 13, and pipe orifices are upward; the top of the polar plate 13, which is opposite to the liquid inlets 17, is a roof-shaped structure of the top end of an electrode chamber formed by two inclined plates 16. Disperse into a plurality of inlet 17 that are close to the polar plate with utmost point liquid feed liquor pipe 14 by the water distributor pipe for utmost point liquid can be even when passing through negative pole positive pole erodees plate electrode 13, converge in the membrane stack again or discharge, make the difficult deposit of incrustation scale like this, bubble attached to on the polar plate is also washed away, the area of contact of electrode reaction has been increased, and simultaneously, the roof column structure on electrode compartment top that two swash plates 16 constitute makes the rivers formation on inlet 14 block, the dynamics of erodeing increases, incrustation scale and bubble are along with rivers come-up, discharge by utmost point liquid back flow 15.

Preferably: the polar liquid return pipe 15 is connected to the middle position of the tops of the two inclined plates. The sewage flushed by the water flow and the bubbles generated by the reaction on the polar plate are enclosed below the inclined plate and float upwards to the polar liquid return pipe 15 to be discharged, so that the corrosion of the gas generated by the electrolytic reaction on the polar plate is prevented, the generated precipitate can be flushed away in time, and the scaling of the polar plate is prevented. See fig. 4.

Preferably: the outer bottom of the desalting chamber 2 is connected with a wastewater inlet pipeline 22, and the inner bottom of the desalting chamber 2 is provided with a filtering and screening net 21.

The filler of the filtering and screening net 21 is activated carbon. The filler of the filtering screen can be replaced by multiple layers of fine gauze or other materials with adsorption filtration.

The utility model provides a filter sieve screen blocks large-scale particle impurity outside on the one hand, and on the other hand adsorbs the organic matter in the high concentration brine, prevents that it from causing the jam to ion exchange membrane, increases filter sieve screen at the desalination room simultaneously, does not need to add equipment in addition, does not need to enlarge the occupation of land space of equipment.

The utility model discloses device operation process:

1. the pure water pipeline 31 is used for feeding water, so that the water feeding and discharging of the electrodialysis device 1 are balanced, the high-concentration wastewater is desalted after large-scale particle impurities and organic matters are filtered by the filtering and screening net 21 in the desalting chamber 2, the polar liquid enters the electrodialysis device 1 through the liquid inlet 17 of the water distribution pipe and flows out of the polar liquid chamber 4 for circulation;

2. the high-concentration wastewater enters an electrodialysis device 1, the electrodialysis operation voltage is set to be 10V, the operation current is 6.3A, and the operation temperature is 30 ℃; under the action of an electric field, chloride ions in the high-concentration wastewater such as ammonium chloride migrate to a concentrated water side through an anion exchange membrane, ammonium ions migrate to an adjacent concentrated water side through a cation exchange membrane, and because concentrated water compartments are communicated with each other, the ammonium ions and the chloride ions migrate to a concentration chamber 3 to be recombined to form ammonium chloride, and a solution containing the ammonium chloride is obtained at the concentrated water side by electrodialysis; thereby gradually reducing the ammonium chloride content in the high-concentration wastewater to obtain desalted liquid, and feeding the desalted liquid into the desalting chamber 2.

The high-concentration wastewater generated by the concentration chamber 3 is relatively clear and can be led out through a concentrated water outlet pipeline 32, and further refined ammonium chloride solid is obtained through concentration, separation and drying; the desalted solution after desalination is led out through a fresh water outlet pipeline 23, and is purified through a biological method after simple pretreatment, so that the discharge of pollutants is reduced.

The utility model discloses a device pretreatment step of intaking is simple, easy clearance, and more durable, the interpolation of water distributor and the improvement of electrode chamber top structure make the life of electrode longer, and follow-up running cost is lower relatively, and the in-process of handling waste water can not produce the pollutant of intractable and has reduced the emission of pollutant by a wide margin.

Claims

1. The utility model provides a high enriched waste water electrodialysis desalination device, includes electrodialysis device, desalination chamber, concentration chamber and utmost point liquid room all form circulation circuit respectively through feed liquor pipe and back flow with the electrodialysis device, the one end of electrodialysis device is the anode chamber, and the other end is the cathode chamber, has arranged the polar plate in anode chamber and the cathode chamber, the bottom of anode chamber and cathode chamber all is provided with utmost point liquid feed liquor pipe, and the top of anode chamber and cathode chamber is provided with utmost point liquid back flow, its characterized in that: the bottom of the polar plate is connected with a water distribution pipe, the water distribution pipe is communicated with a polar liquid inlet pipe, a plurality of liquid inlets are formed in the water distribution pipe, the liquid inlets are tightly attached to the bottom plate surface of the polar plate, and pipe orifices are upward; two inclined plates are fixed above the polar plates opposite to the liquid inlets, and the two inclined plates form a roof-shaped structure at the top end of the polar chamber.

2. Electrodialysis electrode compartment arrangement according to claim 1, characterized in that: the polar liquid return pipe is connected to the middle position of a roof shape formed by the two inclined plates.

3. Electrodialysis electrode compartment device according to claim 1, characterized in that: the bottom outside the desalting chamber is connected with a wastewater inlet pipeline, and the bottom inside the desalting chamber is provided with a filtering and screening net.

4. Electrodialysis electrode compartment arrangement according to claim 3, characterized in that: the filler of the filter screen is active carbon.