An electrolytic treatment device and method for electroplating sewage

Abstract

The present invention relates to industrial wastewater treatment technology, and particularly to an electrolytic treatment device and method for electroplating sewage. An electrolytic treatment device for electroplating sewage includes a reaction water tank, on which a liquid inlet and a liquid outlet are provided. The liquid inlet is connected with a liquid inlet pipe, and the liquid outlet is connected with a liquid outlet pipe. It further includes: a flow rate mechanism: including a turbine, the turbine is respectively rotatably connected inside the liquid inlet pipe and the liquid outlet pipe, and the rotation axes of the turbine are respectively perpendicular to the central axes of the liquid inlet pipe and the liquid outlet pipe; a linkage mechanism: the linkage mechanism is arranged between the liquid inlet pipe and the liquid outlet pipe; the linkage mechanism includes a coaxial upper turntable and a lower turntable. An electrolytic treatment method for electroplating sewage includes the following steps: S1: The electroplating sewage enters the reaction water tank from the liquid inlet pipe; S2: Relevant reagents that react with the electroplating sewage are added into the reaction water tank. The problem that the liquid inlet rate and the liquid outlet rate do not match in the treatment of electroplating sewage is solved.

Description

Technical Field

[0001] The invention relates to industrial wastewater treatment technology, and in particular to an electrolytic treatment device and method for electroplating wastewater. Background Art

[0002] In the process of industrial electroplating, a large amount of electroplating wastewater is often generated. Electroplating wastewater is mainly composed of plated parts cleaning water, waste electroplating solution, equipment cooling water and bath solution leaked from the plating tank. Electroplating wastewater often contains different concentrations of metal ions such as zinc, nickel, iron, chromium, lead, and copper. If it is discharged directly without treatment, it will not only lead to the waste and loss of some precious non-ferrous metal resources, but also cause a certain degree of pollution to the environment, and even seriously threaten human health.

[0003] In the treatment of chromium in electroplating wastewater, the invention patent with application number 201810907464.9 provides a method for treating trivalent chromium plating wastewater, which utilizes the synergistic effect of ferrous ions and calcium ions, uses ferrous ions and calcium ions to precipitate carboxyl-containing organic acid complexing agents in wastewater, and releases trivalent chromium from the complex to generate chromium hydroxide precipitation, thereby effectively removing trivalent chromium. Sodium hypochlorite solution is used as an oxidant to control the ORP value and oxidation time, ensuring that the progress of the oxidation reaction can effectively destroy the organic additives in the wastewater and reduce its COD. All indicators meet the wastewater discharge standards, protect the environment, reduce wastewater treatment costs, and improve economic benefits.

[0004] The above technology chemically reacts the reaction reagent with trivalent chromium electroplating wastewater to achieve the purpose of removing trivalent chromium. However, when the chemical reaction is carried out in the reactor or the reaction water tank, the rates of liquid inlet and liquid outlet do not match, which will make the ratio of the reaction reagent to the reaction solution difficult to control, and will cause some wastewater that does not have time to react to be discharged, resulting in the treated wastewater failing to achieve the predetermined treatment effect. Therefore, a technology is needed that can synchronize the rates of liquid inlet and liquid outlet during wastewater treatment. Summary of the invention

[0005] The present invention provides an electrolytic treatment device and method for electroplating wastewater, which can solve the problem of mismatch between liquid inlet rate and liquid outlet rate in electroplating wastewater treatment.

[0006] In order to solve the above technical problems, the present application provides the following technical solutions: an electrolytic treatment device for electroplating wastewater, comprising a reaction water tank, the reaction water tank having a liquid inlet and a liquid outlet, the liquid inlet being connected to a liquid inlet pipe, the liquid outlet being connected to a liquid outlet pipe, and further comprising:

[0007] Flow rate mechanism: comprising a turbine, the turbine is rotatably connected to the liquid inlet pipe and the liquid outlet pipe respectively, and the rotation axis of the turbine is perpendicular to the central axis of the liquid inlet pipe and the liquid outlet pipe respectively;

[0008] Linkage mechanism: The linkage mechanism is arranged between the liquid inlet pipe and the liquid outlet pipe; the linkage mechanism includes a coaxial upper turntable and a lower turntable, and the upper turntable and the lower turntable are respectively coaxially fixedly connected with the rotating shafts of the two turbines; a isotropic rod is fixedly provided at the eccentric part of the end face of the upper turntable facing the lower turntable, and an arc groove is coaxially opened on the end face of the lower turntable facing the upper turntable, and the end of the isotropic rod is slidably connected to the arc groove.

[0009] The basic principle and beneficial effects of this scheme are as follows: electroplating wastewater is transported to the reaction water tank through the liquid inlet pipe, reaction reagents are added for chemical reaction, and the solution after the reaction is discharged from the liquid outlet pipe. The flow rate mechanism inside the liquid inlet pipe and the liquid outlet pipe is used to regulate the flow rate of the liquid inlet pipe and the liquid outlet pipe. The turbine located in the liquid inlet pipe and the liquid outlet pipe is adjusted by the linkage mechanism. The upper turntable and the lower turntable are respectively connected to the two turbines, and the isobar fixed on the upper turntable matches the arc groove excavated on the lower turntable. The isobar can slide in the arc groove, that is, when the speed of the turbine connected to the upper turntable is faster than the speed of the turbine connected to the lower turntable, the force on the upper turntable is greater than the force on the lower turntable. When the isobar moves to the extreme position in the arc groove, it will drive the lower turntable to move synchronously to complete the synchronization of the two turntables.

[0010] In this solution, the liquid inlet pipe, reaction water tank and liquid outlet pipe are integrated, ensuring convenience in large-scale sewage treatment processes.

[0011] This scheme uses the linkage mechanism and the flow rate mechanism in coordination. When the liquid inlet speed is greater than the liquid outlet speed, the force exerted on the liquid inlet turbine is greater than the force exerted on the liquid outlet turbine. The isotropic rod reaches the limit position of the groove under the push of the turbine, so that the liquid inlet turbine and the liquid outlet turbine operate synchronously, thereby making the liquid inlet rate consistent with the liquid outlet rate. Moreover, at the synchronous speed, since the power for accelerating the liquid outlet turbine comes from the liquid inlet turbine, the speed synchronization of the liquid inlet and the liquid outlet is achieved, and at the same time, the liquid inlet rate is reversely regulated to slow down the liquid inlet rate to prevent excessively fast liquid inlet and insufficient reaction.

[0012] Furthermore, it also includes a plurality of support seats, and the support seats are fixedly connected to the reaction water tank.

[0013] Beneficial effects: The fixation of the reaction water tank is ensured, and a stable place is provided for the chemical reaction in the reaction water tank.

[0014] Furthermore, the arc-shaped groove is a superior arc-shaped groove.

[0015] Beneficial effect: It makes the tolerance of synchronous liquid inlet and outlet speed greater.

[0016] Furthermore, the arc-shaped groove is a inferior arc-shaped groove.

[0017] Beneficial effect: The synchronization speed of liquid inlet and liquid outlet is faster.

[0018] Furthermore, an observation port is provided on the box body of the reaction water tank, and the observation port is sealed with a transparent material.

[0019] Beneficial effect: It is convenient for the operator to observe the reaction situation in the reaction water tank.

[0020] Furthermore, a plurality of liquid inlets are also provided on the box body of the reaction water tank.

[0021] Beneficial effect: It is convenient to add reaction reagents through the liquid inlets.

[0022] Furthermore, a filter screen is fixedly provided above the liquid outlet inside the box body of the reaction water tank.

[0023] Beneficial effect: Prevent the generated precipitate from flowing out of the reaction water tank through the water outlet pipe.

[0024] Furthermore, a stirring mechanism is also provided inside the reaction water tank. The stirring mechanism includes a stirring motor and stirring blades. The stirring blades are coaxially and fixedly connected to the output shaft of the stirring motor, and the end of the stirring motor far from the output shaft is fixedly connected to the upper wall surface of the reaction water tank.

[0025] Beneficial effect: It is used to stir the solution in the reaction water tank and accelerate the reaction rate.

[0026] Furthermore, the central axes of the liquid inlet pipe and the liquid outlet pipe are located in the same vertical plane.

[0027] Beneficial effect: Reduce space occupation and at the same time facilitate the laying of the linkage mechanism and the flow rate mechanism.

[0028] An electroplating sewage electrolysis treatment method includes the following steps:

[0029] S1: The electroplating sewage enters the reaction water tank from the liquid inlet pipe;

[0030] S2: Relevant reagents for reacting with the electroplating sewage are added into the reaction water tank;

[0031] S3: Stir the mixed solvent in the reaction water tank;

[0032] S4: The solution after the reaction is discharged through the liquid outlet pipe;

[0033] S5: Synchronize the flow rates of the liquids in the liquid inlet pipe and the liquid outlet pipe. Description of the Drawings

[0034] Figure 1 It is a perspective view of the first embodiment of an electroplating sewage electrolysis treatment device;

[0035] Figure 2 It is a front view of the first embodiment of an electroplating sewage electrolysis treatment device (the inlet and outlet water pipes, etc. are not shown).

[0036] Figure 3 is Figure 2 a sectional view taken along A-A in;

[0037] Figure 4 is Figure 3 an enlarged view at position B in;

[0038] Figure 5 is Figure 3 a perspective view of the upper turntable and the lower turntable;

[0039] Figure 6 is a perspective view of the spiral impeller in Embodiment 1 of an electroplating sewage electrolysis treatment device;

[0040] Figure 7 is a schematic diagram of the osmotic treatment tank in Embodiment 2;

[0041] Figure 8 is a schematic diagram of the reaction tank in Embodiment 2. Detailed implementation manners

[0042] The following is a further detailed description through specific implementation manners:

[0043] The markings in the attached drawings of the specification include: reaction water tank 1, support base 11, liquid inlet 21, liquid outlet 22, first liquid inlet 23, second liquid inlet 24, observation port 25, liquid inlet pipe 3, liquid inlet flow box 31, liquid outlet pipe 4, liquid outlet flow box 41, protective shell 5, lower turntable 61, upper turntable 62, arc groove 63, lower rotating shaft 641, upper rotating shaft 642, bearing 643, coaxial rod 65, spiral impeller 7, spiral blade 71, filter screen 8, stirring motor 9, stirring blade 91, osmotic treatment tank 100, anode 101, cathode 102, DC power supply 103, bipolar membrane 104, anion exchange membrane 105, cation exchange membrane 106, alkali discharge port 1071, acid discharge port 1072, return port 1073.

[0044] In Embodiment 1, as shown in the attached Figure 1 and the attached Figure 3 figures,

[0045] an electroplating sewage electrolysis treatment device includes a reaction water tank. The reaction water tank is provided with a liquid inlet 21 and a liquid outlet 22. The liquid inlet 21 is connected to a liquid inlet pipe 3, and the liquid outlet 22 is connected to a liquid outlet pipe 4. The liquid inlet 21 is opened on the left side of the reaction water tank as shown in Figure 3 the figure, and the water outlet is opened below the reaction water tank. It further includes:

[0046] Flow rate mechanism: As shown in the attached Figure 3 and the attached Figure 6As shown, it includes a turbine, which is rotatably connected in the liquid inlet pipe 3 and the liquid outlet pipe 4, respectively, and the rotation axis of the turbine is perpendicular to the central axis of the liquid inlet pipe 3 and the liquid outlet pipe 4, respectively; the central axes of the liquid inlet pipe 3 and the liquid outlet pipe 4 are located in the same vertical plane. The turbine is installed at the liquid inlet flow box 31 at the liquid inlet pipe 3, and a square through hole with a side length consistent with the diameter of the liquid inlet pipe 3 is opened inside the liquid inlet flow box 31. The liquid inlet pipe 3 is connected to both sides of the through hole, so that the electroplating wastewater can enter the reaction water tank through the liquid inlet pipe 3, the liquid inlet flow box 31, and the liquid inlet pipe 3. The diameter of the turbine size is consistent with the diameter of the liquid inlet pipe 3, and the diameters of the liquid inlet pipe 3 and the liquid outlet pipe 4 are consistent. The height of the turbine is consistent with the diameter of the liquid outlet pipe 4. The liquid outlet flow box 41 is arranged on the liquid outlet pipe 4, and its size is consistent with the liquid inlet flow box 31.

[0047] Linkage mechanism: as attached Figure 4 and attached Figure 5 As shown, the linkage mechanism is arranged between the liquid inlet pipe 3 and the liquid outlet pipe 4; the linkage mechanism comprises a coaxial upper turntable 62 and a lower turntable 61, and the upper turntable 62 and the lower turntable 61 are coaxially fixedly connected with the rotating shafts of the two turbines respectively; an eccentric portion of the end surface of the upper turntable 62 facing the lower turntable 61 is fixedly provided with an isotropic rod 65, and an arc groove 63 is coaxially opened on the end surface of the lower turntable 61 facing the upper turntable 62, and the end of the isotropic rod 65 is slidably connected to the arc groove 63. The arc groove 63 is a superior arc groove. The upper rotating shaft 642 is coaxially fixedly connected with the rotating shaft of the turbine in the liquid inlet pipe 3, the lower rotating shaft 641 is coaxially fixedly connected with the rotating shaft of the turbine in the liquid outlet pipe 4, the other end of the upper rotating shaft 642 is coaxially fixedly connected with the upper turntable 62, and the other end of the lower rotating shaft 641 is coaxially fixedly connected with the lower turntable 61. The upper rotating shaft 642 is coaxial with the lower rotating shaft 641 and is perpendicular to the center lines of the liquid inlet pipe 3 and the liquid outlet pipe 4 respectively.

[0048] As attached Figure 2 As shown, four support bases 11 are also included, and the support bases 11 are fixedly connected to the reaction water tank.

[0049] As attached Figure 1 As shown, the reaction water tank has an observation port 25 on its body, and the observation port 25 is sealed with a transparent material. The observation port 25 is sealed with glass.

[0050] The reaction water tank is also provided with a plurality of liquid inlets 21 for adding reaction reagents. The reagents are synergistic effects of ferrous ions and calcium ions, and the ferrous ions and calcium ions are used to precipitate the carboxyl-containing organic acid complexing agent in the wastewater.

[0051] A filter screen 8 is also fixedly provided above the liquid outlet 22 inside the reaction water tank, and the filter screen 8 blocks the sediment to prevent it from flowing out and affecting the sewage treatment effect.

[0052] As attached Figure 3As shown, a stirring mechanism is further provided inside the reaction water tank. The stirring mechanism includes a stirring motor 9 and stirring blades 91. The stirring blades 91 are coaxially and fixedly connected to the output shaft of the stirring motor 9. One end of the stirring motor 9 away from the output shaft is fixedly connected to the upper wall surface of the reaction water tank. A stirrer with a suitable size is selected for the stirring mechanism.

[0053] An electroplating sewage electrolysis treatment method includes the following steps:

[0054] S1: The electroplating sewage enters the reaction water tank from the liquid inlet pipe 3;

[0055] S2: Relevant reagents for reacting with the electroplating sewage are added into the reaction water tank;

[0056] S3: Stir the mixed solvent in the reaction water tank;

[0057] S4: The solution after the reaction is discharged through the liquid outlet pipe 4;

[0058] S5: Synchronize the flow rates of the liquids in the liquid inlet pipe 3 and the liquid outlet pipe 4.

[0059] Embodiment 2

[0060] Embodiment 2 is a further improvement of Embodiment 1. The same parts will not be described again. The differences are as follows: It further includes:

[0061] Osmotic treatment tank 100: As shown in the appendix Figure 7 As shown, the osmotic treatment tank 100 is divided into an anode 101 chamber, a first reaction tank, a second reaction tank, and a metal ion chamber by the sequentially arranged anode 101, anion exchange membrane 105, bipolar membrane 104, cation exchange membrane 106, anion exchange membrane 105, and cathode 102. The anode 101 and the cathode 102 are respectively electrically connected to the positive and negative electrodes of a DC power supply 103. The bipolar membrane 104 is composed of a composite of an anion exchange layer and a cation exchange layer. An alkali discharge port 1071 is opened in the first reaction tank, and an acid discharge port 1072 is opened in the second reaction tank;

[0062] Reaction tank: As shown in the appendix Figure 8As shown, three holes are provided at the left and right ends of the reaction tank, and two of them are respectively communicated with the alkali discharge port 1071 and the acid discharge port 1072; a number of exhaust holes are also provided above the reaction tank; the reflux port 1073 on the reaction tank is connected to the inlet of the liquid inlet pipe 3, and the outlet of the liquid outlet pipe 4 is communicated with the reflux port 1073 on the first reaction tank and the second reaction tank (not shown in the figure). That is, the solutions in the first reaction tank and the second reaction tank respectively enter the reaction tank from the alkali discharge port 1071 and the acid discharge port 1072, then enter the liquid inlet pipe 3 through the reflux port 1073 on the reaction tank, and then flow to the reaction water tank, and then flow back to the reflux port 1073 above the first reaction tank and the second reaction tank through the liquid outlet pipe 4, and re-enter the first reaction tank and the second reaction tank, forming a cycle. Reaction reagents can be added to the reaction water tank to treat the characteristics of the solution from the reaction tank. The linkage of the spiral impellers 7 of the liquid inlet pipe 3 and the liquid outlet pipe 4 ensures that the liquid velocity flowing out of the first reaction tank and the second reaction tank is consistent with the liquid velocity flowing back to the first reaction tank and the second reaction tank, that is, the total amount of the solution in the first reaction tank and the second reaction tank tends to be in a dynamically balanced state, ensuring the stable operation.

[0063] When treating electrolytic sewage, if the electroplating sewage contains a large amount of carbonate ions and metal ions, the H2O between the anion and cation membrane composite layers of the bipolar membrane 104 in the osmotic treatment tank 100 dissociates into H + and OH - and respectively pass through the anion membrane and the cation membrane, as H + and OH -In the ion source, hydrogen ions enter the second reaction pool through the cation exchange membrane layer of the bipolar membrane 104. Under the action of an electric field, metal ions enter the metal ion chamber. Initially, sewage is discharged into the first reaction pool and the second reaction pool. At the beginning, the pH value of the second reaction pool is adjusted so that carbonate ions can only react with hydrogen ions to form bicarbonate ions. Then, the compound formed by bicarbonate ions is introduced into the reaction box through the acid discharge port 1072. Hydroxide ions pass through the anion exchange membrane of the bipolar membrane 104 and enter the first reaction pool. Under the action of an electric field, metal ions enter the anode 101 chamber, completing the separation of metal ions. The solution in the first reaction pool is alkaline. The liquid in the first reaction pool is connected to the reaction box through the alkali discharge port 1071. The liquid in the first reaction pool reacts fully with the liquid in the second reaction pool, generating carbon dioxide which is discharged, completing the removal of carbonate ions. The solution flows back into the first reaction pool and the second reaction pool through the holes on the reaction box. At this time, the solution is alkaline and returns to the second reaction pool again to further consume the newly generated hydrogen ions, preventing carbon dioxide from being generated in the second reaction pool and causing the bipolar membrane 104 to be burned. Moreover, there is no need to add new alkaline substances to adjust the pH value in the second reaction pool, reducing the use of alkaline substances. The osmotic treatment pool 100 and the reaction box are used to remove carbonate ions from sewage, and at the same time complete the separation of metal ions and non-metal ions in the sewage. After multiple cycles of treatment, metal ions in the first reaction pool and the second reaction pool are continuously stripped into the anode 101 chamber and the metal ion chamber. The composition of the solution in the liquid outlet pipe 4 is detected by a test paper or a detection instrument specialized for detecting the content of metal ions. If the content of metal ions is within the qualified standard, the solutions in the metal ion chamber (including the anode chamber) and the liquid outlet pipe 4 (including the cathode chamber) are collected respectively to complete this treatment, and sewage is added again to the first reaction pool and the second reaction pool, and the operation is repeated.

[0064] The above are only embodiments of the present invention. The present invention is not limited to the fields involved in this embodiment. Common general knowledge such as specific structures and characteristics known in the art are not described in detail here. Those of ordinary skill in the art know all the common general knowledge in the technical field to which the invention belongs before the filing date or the priority date, can know all the prior art in this field, and have the ability to apply conventional experimental means before this date. Those of ordinary skill in the art can, under the inspiration given in this application, combine their own abilities to improve and implement this solution. Some typical well-known structures or well-known methods should not become obstacles for those of ordinary skill in the art to implement this application. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, and these should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. An electrolytic treatment device for electroplating wastewater, comprising a reaction water tank, the reaction water tank having a liquid inlet and a liquid outlet, the liquid inlet being connected to a liquid inlet pipe, the liquid outlet being connected to a liquid outlet pipe, It is characterized in that It also includes: a flow rate mechanism: including a turbine, the turbine is rotatably connected to the liquid inlet pipe and the liquid outlet pipe respectively, and the rotation axis of the turbine is perpendicular to the central axis of the liquid inlet pipe and the liquid outlet pipe respectively; Linkage mechanism: The linkage mechanism is arranged between the liquid inlet pipe and the liquid outlet pipe; the linkage mechanism includes a coaxial upper turntable and a lower turntable, and the upper turntable and the lower turntable are respectively coaxially fixedly connected with the rotating shafts of the two turbines; a isotropic rod is fixedly provided at the eccentric part of the end face of the upper turntable facing the lower turntable, and an arc groove is coaxially opened on the end face of the lower turntable facing the upper turntable, and the end of the isotropic rod is slidably connected to the arc groove.

2. The electrolytic treatment equipment for electroplating wastewater according to claim 1, Features: It also includes a plurality of support seats, which are fixedly connected to the reaction water tank.

3. The electrolytic treatment equipment for electroplating wastewater according to claim 1, Features: The arc-shaped groove is a superior arc-shaped groove.

4. The electrolytic treatment equipment for electroplating wastewater according to claim 1, Features: The arc-shaped groove is a poor arc-shaped groove.

5. The electrolytic treatment equipment for electroplating wastewater according to claim 1, Features: An observation port is provided on the box body of the reaction water box, and the observation port is sealed with a transparent material.

6. The electrolytic treatment equipment for electroplating wastewater according to claim 1, Features: The reaction water tank is also provided with a plurality of liquid inlets on its body.

7. The electrolytic treatment equipment for electroplating wastewater according to claim 1, Features: A filter screen is also fixedly arranged above the liquid outlet in the box body of the reaction water box.

8. The electrolytic treatment equipment for electroplating wastewater according to claim 1, Features: A stirring mechanism is also provided inside the reaction water tank, and the stirring mechanism includes a stirring motor and a stirring blade, the stirring blade is coaxially fixedly connected to the output shaft of the stirring motor, and one end of the stirring motor away from the output shaft is fixedly connected to the upper wall of the reaction water tank.

9. The electrolytic treatment equipment for electroplating wastewater according to claim 1, Features: The central axes of the liquid inlet pipe and the liquid outlet pipe are located in the same vertical plane.

10. A method for electrolytic treatment of electroplating wastewater, It is characterized in that Using the device according to any one of claims 1 to 9, The following steps are involved: S1: Electroplating wastewater enters the reaction water tank from the liquid inlet pipe; S2: Add relevant reagents that react with electroplating wastewater into the reaction water tank; S3: stirring the mixed solvent in the reaction water tank; S4: After the reaction is completed, the solution is discharged through the liquid outlet pipe; S5: Synchronize the flow rate of the liquid in the liquid inlet pipe and the liquid outlet pipe.

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