CN210393842U

CN210393842U - Electroplating effluent heavy metal ion enrichment recovery processing device

Info

Publication number: CN210393842U
Application number: CN201921143442.6U
Authority: CN
Inventors: 谢传建
Original assignee: Hangzhou Chuanyi Technology Co ltd
Current assignee: Hangzhou Chuanyi Technology Co ltd
Priority date: 2019-07-20
Filing date: 2019-07-20
Publication date: 2020-04-24
Anticipated expiration: 2029-07-20

Abstract

The utility model provides an electroplating wastewater heavy metal ion enrichment and recovery treatment device, which comprises a direct current power supply, a heavy metal ion enrichment and recovery treatment unit, a regenerated liquid circulation supply unit and an enrichment liquid circulation supply unit; the heavy metal ion enrichment and recovery processing unit comprises an anode chamber, an enrichment chamber and a cathode chamber which are sequentially connected in series, wherein the anode chamber comprises anode plates and a cation film which are positioned on two sides of the anode chamber; the cathode chamber comprises cathode plates and an anion membrane which are positioned at two sides of the cathode chamber; the cation film and the anion film are respectively positioned at two sides of the enrichment chamber; the anode plate and the cathode plate are respectively positioned at two sides of the outer side of the heavy metal ion enrichment and recovery processing unit and are electrically connected with the direct current power supply to form a closed loop; the regeneration liquid circulating supply unit is respectively communicated with the anode chamber and the cathode chamber, and the enrichment liquid circulating supply unit is communicated with the enrichment chamber, so that the device has the advantages of reasonable structure, low energy consumption and less membrane scaling.

Description

Electroplating effluent heavy metal ion enrichment recovery processing device

Technical Field

The utility model belongs to electroplating sewage treatment field, concretely relates to electroplating effluent heavy metal ion enrichment recovery processing device.

Background

In the prior art, the chemical precipitation method is mainly used for removing heavy metal ions in electroplating wastewater, but the chemical precipitation method cannot completely remove the heavy metal ions in the wastewater, because of the competitive effect of salt ions, in order to reduce the heavy metal ions to ppm level, the chemical precipitation primary precipitation method is required to be combined with other enrichment methods, such as adsorption, ion exchange, reverse osmosis, electrochemical method, biochemical method and the like, but the enrichment methods still have many problems, such as regeneration problems of adsorption and ion exchange resin, scaling of membranes and electrodes, high energy consumption, biological toxicity and high stability requirement. In the prior art, the method can not enrich low-concentration heavy metal ions from the wastewater with high efficiency and low energy consumption, and when the electroplating wastewater belongs to high-salinity wastewater, other anions in the wastewater can obviously interfere the removal efficiency of the heavy metals.

In the prior art, the removal of low-concentration heavy metal ions in wastewater is difficult to realize, and low efficiency and secondary pollution are easily caused.

SUMMERY OF THE UTILITY MODEL

The utility model is directed at above-mentioned defect, provide one kind can effectively enrich heavy metal ion and retrieve and recycle to the resin of enrichment heavy metal ion is retrieved in the regeneration, avoids the electroplating effluent heavy metal ion enrichment recovery processing device that the ionic membrane scale deposit blockked up.

The utility model provides a following technical scheme: an electroplating wastewater heavy metal ion enrichment and recovery treatment device comprises a direct current power supply, a heavy metal ion enrichment and recovery treatment unit, a regenerated liquid circulating supply unit and an enrichment liquid circulating supply unit; the heavy metal ion enrichment and recovery processing unit comprises an anode chamber, an enrichment chamber and a cathode chamber which are sequentially connected in series, wherein the anode chamber comprises an anode plate and a cation film which are positioned on two sides of the anode chamber; the cathode chamber comprises cathode plates and an anion membrane which are positioned at two sides of the cathode chamber; the cation membrane and the anion membrane are respectively positioned at two sides of the enrichment chamber; the anode plate and the cathode plate are respectively positioned at two sides of the outer side of the heavy metal ion enrichment and recovery processing unit and are electrically connected with the direct-current power supply to form a closed loop; the regeneration liquid circulating supply unit is respectively communicated with the anode chamber and the cathode chamber, and the enriched liquid circulating supply unit is communicated with the enrichment chamber.

As the utility model discloses a further inject, the indoor still including being located of positive pole the cation resin obturator in the middle of positive pole plate and the cation film, the cathode chamber is still including being located the anion resin obturator in the middle of negative pole plate and the anion film, the indoor enrichment liquid backward flow board that is provided with of enrichment.

As the utility model discloses a further inject, the anode plate with the negative plate evenly is provided with the rivet all around, the cation resin obturator the anion obturator with all be provided with on the enrichment liquid backward flow board with rivet complex perforate, through the rivet with it cooperatees with to perforate anode plate, cation resin obturator, enrichment liquid backward flow board, anion resin obturator and negative plate mutual fixed connection in proper order.

As the utility model discloses a further inject, the cation resin obturator anion resin obturator with enrichment liquid backward flow board is middle hollow out construction.

As a further limitation of the present invention, the middle hollow structure is a hollow structure of quadrilateral hollow, serpentine hollow, S-shaped hollow, U-shaped hollow, X-shaped hollow or cross-shaped hollow.

As a further limitation of the present invention, the cation resin packing body is filled with a macroporous weakly acidic cation exchange resin, and the anion resin packing body is filled with a weakly basic anion exchange resin.

As a further limitation of the present invention, the cationic resin filling rate and the anionic resin filling rate are 30 to 70%.

As a further limitation of the present invention, the regenerated liquid circulation supply unit includes an acid circulation supply unit having an acid anode chamber communicating valve and an acid cathode chamber communicating valve, and an alkali circulation supply unit having an alkali anode chamber communicating valve and an alkali cathode chamber communicating valve.

As a further limitation of the present invention, the anode plate and the cathode plate are capacitance type active carbon electrode plates, the capacitance type active carbon electrode plates are embedded with titanium alloy meshes, and the titanium alloy meshes are coated with capacitance type active carbon-acetylene black-polytetrafluoroethylene copolymer.

As the utility model discloses a further inject, processing apparatus's direct current power supply operating environment is 0.05 ~ 0.25V voltage, 2.5 ~ 5.0mA electric current.

The utility model has the advantages that:

1) the capacitance type active carbon electrode plate coated with the titanium alloy mesh and the active carbon can effectively improve the electronic adsorption capacity of the anode and the cathode to heavy metal ions, further reduce the number of stacked layers of the ion exchange membrane, effectively improve the heavy metal ion treatment capacity and reduce the stacking cost of the ion exchange membrane.

2) The utility model discloses a regeneration liquid circulation unit is connected with enrichment liquid circulation unit and heavy metal ion enrichment recovery processing unit, through continuous letting in of acid, alkali regeneration liquid to anode chamber and cathode chamber, can effectively carry out desorption to cation exchange resin and anion exchange resin and electrode, avoided ion exchange resin to reach the defect that can not continue to catch the adsorption ion after certain saturated condition, the while operation is simple and easy, need not to take out cation resin obturator and anion resin obturator and can carry out the desorption of ion exchange resin; by exchanging the acid and alkali passed into the anode and cathode compartments and the potentials applied to the anode and cathode plates, the anode and cathode electrodes can be effectively desorbed further.

3) The regeneration liquid such as acid liquor, alkali liquor and the like used in desorption can be effectively recycled through simple and easy ion exchange resin desorption and electrode desorption, the service life of the ion exchange resin and the efficiency of heavy metal ion treatment in electroplating wastewater are ensured, the removal rate of heavy metal ions is improved, the enrichment chamber and the enrichment liquid circulating supply unit 4 communicated with the enrichment chamber are used for enriching and recycling the high-concentration heavy metal enrichment liquid generated by the treated electroplating wastewater, the heavy metal ion removal rate of the electroplating wastewater is improved, secondary pollution to the environment is avoided, and the heavy metal ions are effectively utilized.

4) Through the utility model provides a processing apparatus can effectively avoid the scale deposit condition of ion exchange film in the use, leads to handling and can not go on, perhaps leads to needing the emergence of the condition that higher voltage and electric current just can continue to handle electroplating effluent, has saved the energy consumption of handling electroplating effluent, has improved the life and the required stack thickness of ion exchange membrane, has reduced the required cost of handling electroplating effluent.

Drawings

The present invention will be described in more detail hereinafter based on embodiments and with reference to the accompanying drawings. Wherein:

FIG. 1 is a schematic structural view of an electroplating wastewater heavy metal ion enrichment and recovery treatment device provided by the utility model;

fig. 2 is a decomposition structure diagram of the heavy metal ion enrichment and recovery processing unit in example 1 of the processing apparatus provided by the present invention;

fig. 3 is a decomposition structure diagram of the heavy metal ion enrichment and recovery processing unit in example 2 of the processing apparatus provided by the present invention;

fig. 4 is a decomposition structure diagram of the heavy metal ion enrichment and recovery processing unit in embodiment 3 of the processing apparatus provided by the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. 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.

Example 1

As shown in the attached drawings 1-2, the device for enriching, recovering and treating heavy metal ions in electroplating wastewater provided by the utility model comprises a direct current power supply 1, a heavy metal ion enriching, recovering and treating unit 2, a regeneration liquid circulating and supplying unit 3 and an enrichment liquid circulating and supplying unit 4, wherein the working environment of the direct current power supply 1 is 0.05V voltage and 2.5mA current;

the heavy metal ion enrichment and recovery processing unit 2 comprises an anode chamber 2-1, an enrichment chamber 2-2 and a cathode chamber 2-3 which are sequentially connected in series, the anode chamber 2-1 comprises an anode plate 2-11 and a cation film 2-12 which are positioned on two sides of the anode chamber 2-1, and a cation resin filling body 2-13 which is positioned between the anode plate 2-11 and the cation film 2-12, the cation resin filling body 2-13 is a quadrilateral hollow, 31% of macroporous weak acid cation exchange resin 2-131 is filled in the hollow cation resin filling body 2-13, and the macroporous weak acid cation exchange resin 2-131 is used for capturing and adsorbing heavy metal cations in electroplating wastewater.

The cathode chamber 2-3 comprises cathode plates 2-31 positioned at two sides of the cathode chamber 2-3, anion thin films 2-32 and anion resin filling bodies 2-33 positioned between the cathode plates 2-31 and the anion thin films 2-32, the anion resin filling bodies 2-33 are quadrilateral hollows, 31% of macroporous weak-base anion exchange resin 2-331 is filled in the hollow anion resin filling bodies 2-33, and the macroporous weak-base anion exchange resin 2-331 is used for capturing and adsorbing anions in electroplating wastewater.

An enrichment liquid reflux plate 2-21 is arranged in the enrichment chamber 2-2, a cation film 2-12 and an anion film 2-32 are respectively positioned at two sides of the enrichment chamber 2-2, two sides of the enrichment chamber 2-2 are isolated, an enrichment liquid circulating supply unit 4 is communicated with the enrichment chamber 2-2, heavy metal cations at the side of the cation film 2-12 of the enrichment chamber 2-2 can enter the enrichment chamber 2-2 through the cation film 2-12, anions in electroplating wastewater at the side of the anion film 2-32 can enter the enrichment chamber 2-2 through the anion film, heavy metal ion solution is enriched in the enrichment chamber 2-2, and then the heavy metal ion solution is discharged and circulated through the enrichment liquid circulating supply unit 4.

The anode plate 2-11 and the cathode plate 2-31 are electrode plates embedded with a titanium alloy net 2-111 and a titanium alloy net 2-311 respectively, the titanium alloy net 2-111 and the titanium alloy net 2-311 are coated with a capacitance type activated carbon-acetylene black-polytetrafluoroethylene copolymer, the anode plate 2-11 and the cathode plate 2-31 are respectively positioned at two sides of the outer side of the heavy metal ion enrichment and recovery processing unit 2 and are electrically connected with the direct current power supply 1 to form a closed loop, and the adsorption efficiency of the electrodes on heavy metal ions can be increased by utilizing the titanium alloy and the coated copolymer through the guidance of the electrodes through current;

evenly be provided with rivet 5 around anode plate 2-11 and cathode plate 2-31, all be provided with on anode plate 2-11, cathode plate 2-31, cation resin obturator 2-13, anion obturator 2-33 and the enrichment liquid backward flow board 2-21 with rivet complex perforation 5-1, through rivet 5 with perforation 5-1 cooperatees will anode plate 2-11, cation resin obturator 2-13, enrichment liquid backward flow board 2-21, anion resin obturator 2-33 and cathode plate 2-31 are mutual fixed connection in proper order, and then establish ties anode chamber, enrichment room and cathode chamber intercommunication together, carry out enrichment treatment regeneration to electroplating effluent.

The regenerated liquid circulation supply unit 3 comprises an acid circulation supply unit 3-1 and an alkali circulation supply unit (3-2), the regenerated liquid circulation supply unit 3 is respectively communicated with the anode chamber 2-1 and the cathode chamber 2-3, an acid anode chamber communication valve 3-11 and an acid cathode chamber communication valve 3-12 are arranged on the acid circulation supply unit 3-1, and an alkali anode chamber communication valve 3-21 and an alkali cathode chamber communication valve 3-22 are arranged on the alkali circulation supply unit 3-2.

Example 2

As shown in the attached drawings 1 and 3, in order to provide the device for enriching, recovering and treating the heavy metal ions in the electroplating wastewater of the present invention, the difference between the present embodiment and the embodiment 1 is only that the working environment of the dc power supply is 0.15V voltage and 3.3mA current; the cation resin filling bodies 2-13 and the anion resin filling bodies 2-33 are both snakelike hollow out bodies, 50% of macroporous weak-acid cation exchange resin 2-131 is filled in the hollow-out cation resin filling bodies 2-13, and 50% of macroporous weak-base anion exchange resin 2-331 is filled in the hollow-out anion resin filling bodies 2-33.

Example 3

As shown in the attached drawings 1 and 4, in order to provide the device for enriching, recovering and treating the heavy metal ions in the electroplating wastewater of the present invention, the difference between the present embodiment and the embodiment 1 and the embodiment 2 is only that the working environment of the dc power supply is 0.25V voltage and 2.50mA current; the cation resin filling bodies 2-13 and the anion resin filling bodies 2-33 are both U-shaped hollow parts, 69% of macroporous weak-acid cation exchange resin 2-131 is filled in the hollow cation resin filling bodies 2-13, and 69% of macroporous weak-base anion exchange resin 2-331 is filled in the hollow anion resin filling bodies 2-33.

The working principle is as follows:

when the electroplating wastewater is treated, the electroplating wastewater is respectively led into the anode chamber 2-1 and the cathode chamber 2-3, the direct current power supply 1 is switched on, anions in the electroplating wastewater are adsorbed by the anode plate 2-11 and heavy metal cations are adsorbed by the cathode plate 2-31 under the guidance of current, so that the heavy metal cations in the anode chamber 2-1 want to pass through the macroporous weakly acidic cation exchange resin 2-131 in the cation resin filler 2-13 and the cation film 2-12 to reach the cathode plate 2-31 and then be adsorbed by the cathode plate 2-31, during the passing process, part of the heavy metal cations are captured and adsorbed by the macroporous weakly acidic cation exchange resin 2-131, part of the heavy metal cations pass through the cation film 2-12 and then enter the enrichment chamber 2-2, and part of the heavy metal cations reach the cathode plate 2-31 and are adsorbed by the cathode plate 2-, most of the heavy metal cations in the cathode chamber 2-3 are adsorbed by the cathode plate 2-31; similarly, the anions in the cathode chamber 2-3 pass through the macroporous weak base anion exchange resin 2-331 in the anion resin filler 2-33 and the anion membrane 2-32, reach the anode plate 2-11 and are further adsorbed by the anode plate 2-11, during the passing process, part of the anions are captured and adsorbed by the macroporous weak base anion exchange resin 2-331, part of the anions pass through the anion membrane 2-32 and then enter the enrichment chamber 2-2, part of the anions reach the anode plate 2-11 and are adsorbed by the anode plate 2-11, and most of the anions in the anode chamber 2-1 are adsorbed by the anode plate 2-11;

heavy metal cations and anions entering the enrichment chamber 2-2 are mutually combined and enriched into a heavy metal cation solution, and then are discharged and circulated by the enrichment solution circulating supply unit 4 through the diversion of the enrichment solution return plate 2-21, so that the outside can continuously obtain and derive the required high-concentration heavy metal enrichment solution from the enrichment solution circulating supply unit 4;

after the macroporous weakly acidic cation exchange resin 2-131 and the macroporous weakly basic anion exchange resin 2-331 are used for a period of time, the adsorption and capture capacity of ions is reduced, and the ions adsorbed by the anode plate 2-11 and the cathode plate 2-31 reach a saturation state after reaching a certain degree, at this time, the acid anode chamber communication valve 3-11 and the alkali cathode chamber communication valve 3-22 are opened, acid is respectively introduced into the anode chamber 2-1 and alkali is introduced into the cathode chamber 2-3, H + in the acid can pass through the cation thin film 2-12, OH-is left and is adsorbed by the anode plate 2-11, oxygen is further generated, the anion ions adsorbed on the anode plate 2-11 are desorbed, and similarly, OH-in the cathode chamber 2-3 passes through the anion thin film 2-32, h + is left to be adsorbed by the cathode plate 2-31, and then the cathode plate 2-31 is desorbed; the acid introduced into the anode chamber is used and then recycled to the acid recycling and supplying means 3-1 by adding a small amount of the same acid, and the alkali introduced into the cathode chamber is used and then recycled to the alkali producing recycling and supplying means 3-2 by adding a small amount of the same alkali. After the steps, the cation exchange resins 2-131 and the anion exchange resins 2-331 can be effectively regenerated, the regenerated liquid can be simply and effectively recycled, and more high-concentration heavy metal enriched liquid can be further enriched in the enrichment chamber 2-2 to the enriched liquid recycling supply unit 4.

Then, an alkali anode chamber communicating valve 3-21 communicated with the anode chamber 2-1 and an acid cathode chamber communicating valve 3-12 communicated with the cathode chamber 2-3 are opened, alkali is introduced into the anode chamber and acid is introduced into the cathode chamber respectively, the connection between the anode plate 2-11 and the cathode plate 2-31 and the positive and negative poles of the direct current power supply is changed, the anode plate 2-11 is endowed with negative potential, the cathode plate 2-31 is endowed with positive potential, the anode plate 2-11 endowed with negative potential adsorbs heavy metal cations in the electroplating wastewater due to the change of the current direction, the cathode plate 2-31 endowed with positive potential adsorbs anions, further the anions on the anode plate 2-11 are desorbed, the cations on the cathode plate 2-31 are desorbed, and the alkali introduced into the anode chamber 2-1 is neutralized with the acid introduced in the previous step, recovering weak acidity of cation exchange resin 2-131, introducing acid in cathode chamber 2-3 to neutralize with alkali in the last step, and recovering weak alkalinity of anion exchange resin 2-331. In this step, the alkali introduced into the anode chamber 2-1 is used and then recycled to the alkali circulation supply unit 3-2 by adding a small amount of alkali, and the acid introduced into the cathode chamber 2-3 is used and then recycled to the acid circulation supply unit 3-1 by adding a small amount of acid. After this step, the anode plates 2 to 11 and the cathode plates 2 to 31 can completely desorb the adsorbed anions and cations, respectively; meanwhile, the cation membrane 2-12 and the anion membrane 2-32 can be cleaned, so that the scaling of the ion exchange membrane is avoided; and more high-concentration heavy metal enriched liquid can be enriched in the enrichment chamber 2-2 again to the enriched liquid circulating supply unit 4.

The electroplating sewage treated by the utility model can reach the three types of electroplating sewage discharge standards of the national GB21900-2008 'electroplating pollutant discharge standard'.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present invention is not limited to the particular embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. The device for enriching, recovering and treating the heavy metal ions in the electroplating wastewater is characterized by comprising a direct-current power supply (1), a heavy metal ion enriching, recovering and treating unit (2), a regenerated liquid circulating and supplying unit (3) and an enriched liquid circulating and supplying unit (4); the heavy metal ion enrichment and recovery processing unit (2) comprises an anode chamber (2-1), an enrichment chamber (2-2) and a cathode chamber (2-3) which are sequentially connected in series, wherein the anode chamber (2-1) comprises anode plates (2-11) and cation membranes (2-12) which are positioned on two sides of the anode chamber; the cathode chamber (2-3) comprises cathode plates (2-31) and anion membranes (2-32) which are positioned at two sides of the cathode chamber; the cation membrane (2-12) and the anion membrane (2-32) are respectively positioned at two sides of the enrichment chamber (2-2); the anode plates (2-11) and the cathode plates (2-31) are respectively positioned at two sides of the outer side of the heavy metal ion enrichment and recovery processing unit (2) and are electrically connected with the direct current power supply (1) to form a closed loop; the regeneration liquid circulating supply unit (3) is respectively communicated with the anode chamber (2-1) and the cathode chamber (2-3), and the enrichment liquid circulating supply unit (4) is communicated with the enrichment chamber (2-2).

2. The enrichment recovery processing device of the electroplating wastewater heavy metal ions as claimed in claim 1, characterized in that the anode chamber (2-1) further comprises a cation resin filling body (2-13) positioned between the anode plate (2-11) and the cation membrane (2-12), the cathode chamber (2-3) further comprises an anion resin filling body (2-33) positioned between the cathode plate (2-31) and the anion membrane (2-32), and the enrichment chamber (2-2) is internally provided with an enrichment liquid reflux plate (2-21).

3. The enrichment, recovery and treatment device for heavy metal ions in electroplating wastewater according to claim 2, it is characterized in that rivets (5) are uniformly arranged on the periphery of the anode plates (2-11) and the cathode plates (2-31), the anode plates (2-11), the cathode plates (2-31), the cation resin filling bodies (2-13), the anion resin filling bodies (2-33) and the concentrated solution reflux plates (2-21) are all provided with through holes (5-1) matched with rivets, the anode plates (2-11), the cationic resin filling bodies (2-13), the concentrated liquid reflux plates (2-21), the anionic resin filling bodies (2-33) and the cathode plates (2-31) are sequentially and fixedly connected with one another through the matching of the rivets (5) and the through holes (5-1).

4. The enrichment, recovery and treatment device for heavy metal ions in electroplating wastewater according to claim 2, wherein the cationic resin filler (2-13), the anionic resin filler (2-33) and the enrichment liquid reflux plate (2-21) are hollow structures.

5. The device for enriching, recovering and treating heavy metal ions in electroplating wastewater according to claim 4, wherein the middle hollow structure is one of a quadrilateral hollow, a serpentine hollow, an S-shaped hollow, a U-shaped hollow, an X-shaped hollow or a cross hollow.

6. The electroplating wastewater heavy metal ion enrichment and recovery processing device as claimed in claim 2, wherein the cation resin filling body (2-13) is filled with macroporous weak acid cation exchange resin (2-131), and the anion resin filling body (2-33) is filled with weak base anion exchange resin (2-331).

7. The electroplating wastewater heavy metal ion enrichment and recovery treatment device according to claim 6, wherein the cationic resin filling rate and the anionic resin filling rate are 30-70%.

8. The enrichment recovery processing device of the electroplating wastewater heavy metal ions as claimed in claim 1, wherein the regeneration liquid circulation supply unit (3) comprises an acid circulation supply unit (3-1) and an alkali circulation supply unit (3-2), the acid circulation supply unit (3-1) is provided with an acid anode chamber communication valve (3-11) and an acid cathode chamber communication valve (3-12), and the alkali circulation supply unit (3-2) is provided with an alkali anode chamber communication valve (3-21) and an alkali cathode chamber communication valve (3-22).

9. The electroplating wastewater heavy metal ion enrichment, recovery and treatment device according to claim 1, wherein the anode plates (2-11) and the cathode plates (2-31) are capacitance type activated carbon electrode plates, the capacitance type activated carbon electrode plates are embedded with titanium alloy nets (6), and capacitance type activated carbon-acetylene black-polytetrafluoroethylene copolymers are coated on the titanium alloy nets (6).

10. The electroplating wastewater heavy metal ion enrichment and recovery processing device according to any one of claims 1 to 9, wherein the working environment of the direct current power supply (1) of the processing device is 0.05-0.25V voltage and 2.5-5.0 mA current.