Advanced wastewater treatment device

Abstract

The invention discloses an advanced wastewater treatment device which comprises an electrolytic bath, a hollow titanium basket electrode arranged in the electrolytic bath, and a power supply electrically connected with the hollow titanium basket electrode, the device comprises at least one pair of hollow titanium basket electrodes, the hollow titanium basket electrodes are filled with metal particles, the bottom of each hollow titanium basket electrode is provided with an aeration device, and the metal particles in the hollow titanium basket electrodes move and collide under the action of bubbles generated by the aeration device in the hollow titanium basket electrodes of the device, so that the depassivation effect can be achieved; meanwhile, electrolyte mass transfer and exchange are achieved through convex holes in the surface of the hollow titanium basket electrode, electrolytic reaction ion migration is achieved, and the device is simple in structure, easy to operate, convenient to add electrode materials, capable of improving the electric flocculation efficiency, low in cost and high in treatment capacity.

Description

Technical Field

[0001] The present invention relates to a sewage treatment device, and more particularly, to a device for advanced treatment of wastewater. Background Art

[0002] The electrocoagulation technology is an effective technology for treating heavy metal pollution in water bodies. It can treat heavy metals (such as chromium, cadmium, mercury, lead, arsenic, copper, zinc, nickel, iron, manganese, and cobalt, etc.), phosphorus-containing, ammonia nitrogen, and other organic wastewater in water at one time, and the treated water quality can meet the discharge standards. At the same time, the electrocoagulation equipment does not require additional oxidants and flocculants, has low treatment costs, simple and convenient equipment operation, high automation, good controllability, and easy maintenance. However, during the electrocoagulation process in the reaction device using the electrocoagulation technology, a dense oxide (or other compound) film will form on the surface of the anode electrode. As the reaction time progresses, the passivation phenomenon on the electrode becomes more and more serious, resulting in problems such as low current efficiency, high power consumption, and high anode cost investment.

[0003] The invention application CN119191483A discloses an internal aeration type organic wastewater treatment device and method. The device includes: an electrolytic cell having an anode plate and a cathode plate therein; an aeration device disposed close to the anode plate; a DC power supply, the positive and negative poles of which are respectively connected to the anode plate and the cathode plate; an air pump; wherein, the interior of the cathode plate has a cavity connected to the air pump to introduce air into the interior of the cathode plate through the air pump. The pores generated by the aeration device of this device are nanoscale or micron-scale, and its function is to increase the oxygen content in water, thereby promoting the oxidation and decomposition of organic matter. When this device is used for a long time, a passivation film is easily formed on the anode surface, thus isolating the anode substrate from the working environment, resulting in the anode being unable to continue to dissolve and release ions. The existence of the passivation film will slow down the anode dissolution rate, reduce the current efficiency, and additionally increase the operating power consumption. Summary of the Invention

[0004] The present invention provides an advanced wastewater treatment device to solve the problems mentioned in the above background art.

[0005] The technical solution adopted by the present invention is as follows:

[0006] An advanced wastewater treatment device includes: an electrolytic cell, a hollow titanium basket electrode placed in the electrolytic cell, and a power supply electrically connected to the hollow titanium basket electrode; at least one pair of the hollow titanium basket electrodes, which are filled with metal particles inside and provided with an aeration device at the bottom.

[0007] Further, the aeration device includes an air pipe provided with air holes, and the aperture of the air holes is 10 - 25 mm.

[0008] Further, the surface of the hollow titanium basket electrode is provided with convex holes, and the aperture of the convex holes is 2-3 mm.

[0009] Further, the protruding direction of the convex holes is vertically downward.

[0010] Further, a cover plate is arranged at the top of the hollow titanium basket electrode, and a wiring post is arranged on the cover plate. The wiring post is connected to a power supply through a wire.

[0011] Further, vertical small holes with an aperture of 2-3 mm are arranged on the cover plate.

[0012] Further, the metal particles are iron particles or aluminum particles, are hollow inside, and have a diameter of 10-25 mm.

[0013] Further, the filling rate of the metal particles is 60-80%.

[0014] Further, the power supply is an alternating current power supply.

[0015] Further, the hollow titanium basket electrodes are arranged in sequence, and adjacent porous titanium basket electrodes are respectively connected to the positive and negative electrodes of the power supply through wires, and the adjacent spacing is 10-50 mm.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] Under the action of the bubbles generated by the aeration device inside the hollow titanium basket electrode of the device of the present invention, the metal particles in the hollow titanium basket electrode move and collide to achieve the de-passivation effect. At the same time, the electrolyte mass transfer and exchange are realized through the convex holes on the surface of the hollow titanium basket electrode, and the ion migration of the electrolytic reaction is realized. The structure of the device is simple and easy to operate, convenient for adding electrode materials, improving the electrocoagulation efficiency, with low cost and strong treatment capacity. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of a wastewater advanced treatment device;

[0019] Figure 2 It is a schematic structural diagram of the hollow titanium basket electrode;

[0020] Figure 3 It is a schematic vertical cross-sectional structural diagram of the hollow titanium basket electrode;

[0021] Figure 4 It is a schematic diagram of the bubbles generated by the aeration device and the solution mass transfer;

[0022] Figure 5 It is a schematic diagram of the comparison result of the phosphorus removal effect with and without aeration when the device is used for treating phosphorus-containing wastewater;

[0023] Wherein: 1. Cover plate; 2. Electrolytic cell; 3. Aeration pipe; 4. Power supply; 5. Terminal; 6. Convex hole; 7. Hollow titanium basket electrode; 8. Aeration device. Detailed implementation mode

[0024] To clearly illustrate the technical features of this solution, the present invention will be elaborated in detail below through specific implementation modes and in conjunction with its accompanying drawings. In the following description, many specific details are set forth in order to fully understand this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited by the specific embodiments disclosed below. Additionally, in the description of this application, it should be understood that terms such as "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of this application. Furthermore, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, the meaning of "a plurality" is two or more, unless otherwise specifically defined. In this application, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. In this application, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may be the direct contact between the first and second features, or the indirect contact between the first and second features through an intermediate medium. In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0025] Example 1

[0026] Please refer to Figures 1 to 5 , an embodiment provided by the present invention:

[0027] A device for advanced treatment of wastewater, comprising: an electrolytic cell 2, a hollow titanium basket electrode 7 placed in the electrolytic cell 2, and a power supply 4 electrically connected to the hollow titanium basket electrode 7; the hollow titanium basket electrode 7 is provided in multiple pairs, filled with metal particles inside, and provided with an aeration device 8 at the bottom.

[0028] The aeration device 8 is located below the inside of the hollow titanium basket electrode 7, and includes an air pipe 3. The air pipe 3 is provided with air holes, the aperture of the air holes is 10 mm, the surface of the hollow titanium basket electrode 7 is evenly covered with convex holes, the protruding direction of the convex holes 6 is vertically downward, the aperture is 2 mm, the top of the hollow titanium basket electrode is provided with a cover plate 1, the cover plate 1 is covered with vertical small holes, the aperture is 2 mm, and the cover plate 1 is provided with a terminal 5. The terminal 5 is connected to the power supply 4 through a wire.

[0029] The hollow titanium basket electrodes 7 are arranged in sequence, and adjacent porous titanium basket electrodes 7 are respectively connected to the positive and negative electrodes of the power supply 4 through wires. The adjacent spacing is 10 mm. Multiple pairs of anodes and cathodes are alternately arranged, which can form multiple electrolysis units. Each unit can independently carry out electrolysis reactions, which helps to increase the electrolysis area, thereby improving the electrolysis efficiency and treatment speed. At the same time, the alternately arranged anodes and cathodes can be maintained and replaced separately without stopping the entire treatment system.

[0030] As Figure 4 shown, under the action of the bubbles generated by the aeration device 8, the metal particles are scoured by the bubbles in the hollow titanium basket electrode 7. At the same time, the bubbles are subjected to an upward buoyancy force. The metal particles move and collide in the hollow titanium basket electrode 7 under the action of the bubbles, achieving the effect of timely removing the passivation layer on the surface of the metal particles. The convex holes 6 on the surface of the hollow titanium basket electrode 7 play a role in electrolyte mass transfer during the electrolysis process. The electrolyte solution enters the inside of the hollow titanium basket electrode through the convex holes 6. During the upward movement of the bubbles generated by the aeration device 8, since vertical small holes are provided at the top of the hollow titanium basket electrode 7, and the movement trajectory of the bubbles through the convex holes 6 needs to go through a tortuous process from top to bottom and then upwards, the relative resistance is large. Therefore, most of the bubbles move upward inside the hollow titanium basket electrode 7 to disturb the electrode metal particles; part of the gas passes through the convex holes 6 on the surface of the hollow titanium basket electrode 7 to realize the transfer and exchange of electrolytes. Therefore, under the action of the bubbles generated by the aeration device inside the hollow titanium basket electrode 7 of the device of the present invention, the movement and collision of the metal particle electrodes can achieve the passivation removal effect, and at the same time, the electrolyte transfer and exchange are realized through the convex holes 6 on the surface of the hollow titanium basket electrode 7, realizing the ion migration of the electrolysis reaction.

[0031] Add the phosphorus-containing wastewater with a total phosphorus concentration of 5 mg / L to the upper edge of the hollow titanium basket electrode 7 in the electrolytic cell. After connection, comparative tests are carried out with aeration and without aeration respectively. It is found that the phosphorus removal rate under the aeration condition is significantly better than that under the non-aeration condition. The phosphorus removal rate under the aeration condition reaches more than 99%, as Figure 5 shown. Aeration can not only provide sufficient dissolved oxygen to the solution, but also stir the solution. In particular, bubbles can blow up metal particles for collision, effectively removing the passivation layer, accelerating the migration of anode Fe(II) ions in the solution, and more quickly combining with hydroxide and phosphate ions to form precipitates, which is conducive to the adsorption and removal of phosphates. In the case of non-aeration, the migration rate of Fe(II) generated at the anode in the solution is slow, and it is easily oxidized by dissolved oxygen to form Fe(III), reducing the removal efficiency of phosphates; especially in the later stage, the passivation phenomenon is very obvious, and the phosphorus removal rate decreases more significantly compared with the initial stage of the reaction. When a wastewater advanced treatment device of this embodiment is used for phosphorus removal, the above-mentioned better removal effect is achieved. Aeration can not only increase dissolved oxygen to effectively improve phosphorus removal, but more importantly, effectively improve electrode passivation, achieving the technical effect of both energy saving and improving the phosphorus removal rate.

[0032] Example 2

[0033] Please refer to Figures 1 to 4 , an embodiment provided by the present invention:

[0034] A wastewater advanced treatment device, comprising: an electrolytic cell 2, a hollow titanium basket electrode 7 placed in the electrolytic cell 2, and a power supply 4 electrically connected to the hollow titanium basket electrode 7; the hollow titanium basket electrode 7 is provided in multiple pairs, filled with metal particles inside, and provided with an aeration device 8 at the bottom.

[0035] The aeration device 8 is located below the inside of the hollow titanium basket electrode 7 and includes an air pipe 3. The air pipe 3 is provided with air holes, the aperture of the air holes is 25 mm, the surface of the hollow titanium basket electrode 7 is evenly covered with convex holes 6, the protruding direction of the convex holes 6 is vertically downward, the aperture is 3 mm, a cover plate 1 is provided at the top of the hollow titanium basket electrode 7, the cover plate 1 is covered with vertical small holes, the aperture is 3 mm, and a terminal 5 is provided on the cover plate 1. The terminal 5 is connected to the power supply 4 through a wire.

[0036] The hollow titanium basket electrodes 7 are arranged in sequence. Adjacent porous titanium basket electrodes 7 are respectively connected to the positive and negative poles of the power supply 4 through wires, and the adjacent spacing is 50 mm. Multiple pairs of anodes and cathodes are alternately arranged to form multiple electrolysis units. Each unit can independently carry out electrolysis reactions, which helps to increase the electrolysis area, thereby improving the electrolysis efficiency and treatment speed. At the same time, the alternately arranged anodes and cathodes can be maintained and replaced separately without stopping the entire treatment system.

[0037] Further, the metal particles are iron balls, which are hollow inside, with a diameter of 10 - 25 mm. The filling rate of the metal particles is set to 60 - 80%, and in this embodiment, it is set to 60%. By setting the metal particles to be hollow, the mass of the electrode ions is reduced, thereby increasing the disturbance effect during aeration and increasing the collision probability of the iron balls.

[0038] As Figure 4 shown, under the action of the bubbles generated by the aeration device 8, the metal particles are scoured by the bubbles in the hollow titanium basket electrode 7. At the same time, the bubbles are subjected to an upward buoyancy force. The metal particles move and collide continuously in the hollow titanium basket electrode 7 under the action of the bubbles, achieving the effect of timely removing the passivation layer on the surface of the iron balls. The convex holes 6 on the surface of the hollow titanium basket electrode play a role in electrolyte mass transfer during electrolysis. The electrolyte solution enters the inside of the hollow titanium basket electrode 7 through the convex holes 6. During the upward movement of the bubbles generated by the aeration device 8, since vertical small holes are provided at the top of the hollow titanium basket electrode 7, and the movement trajectory of the bubbles through the convex holes 6 needs to go through a tortuous process from top to bottom and then upward, with relatively large resistance, most of the bubbles move upward inside the hollow titanium basket electrode 7 to disturb the electrode metal particles; part of the gas passes through the convex holes 6 on the surface of the hollow titanium basket electrode 7 to achieve the transfer and exchange of electrolytes. Therefore, under the action of the bubbles generated by the aeration device in the hollow titanium basket electrode 7 of the device of the present invention, the movement and collision of the metal particle electrodes can achieve the passivation removal effect, and at the same time, the electrolyte transfer and exchange are realized through the convex holes 6 on the surface of the hollow titanium basket electrode 7, realizing the ion migration of the electrolysis reaction.

[0039] Example 3

[0040] Please refer to Figures 1 to 4 , an embodiment provided by the present invention:

[0041] A wastewater advanced treatment device includes: an electrolytic cell 2, a hollow titanium basket electrode 7 placed inside the electrolytic cell 2, and a power supply 4 electrically connected to the hollow titanium basket electrode 7; the hollow titanium basket electrode 7 is provided in multiple pairs, filled with metal particles inside, and an aeration device 8 is provided at the bottom.

[0042] The aeration device 8 is located below the inside of the hollow titanium basket electrode 7 and includes an air diffuser pipe 3. The air diffuser pipe 3 is provided with air diffuser holes with a pore diameter of 20 mm. The surface of the hollow titanium basket electrode 7 is evenly covered with convex holes 6, and the protruding direction of the convex holes 6 is vertically downward with a pore diameter of 2.5 mm. The top of the hollow titanium basket electrode 7 is provided with a cover plate 1, and the cover plate 1 is covered with vertical small holes with a pore diameter of 2.5 mm. A terminal 5 is provided on the cover plate 1, and the terminal 5 is connected to the power supply 4 through a wire.

[0043] The hollow titanium basket electrodes 7 are arranged in sequence. Adjacent porous titanium basket electrodes 7 are respectively connected to the positive and negative electrodes of the power supply 4 through wires, and the adjacent spacing is 30 mm. Multiple pairs of anodes and cathodes are alternately arranged to form multiple electrolysis units. Each unit can independently carry out electrolysis reactions, which helps to increase the electrolysis area, thereby improving the electrolysis efficiency and treatment speed. At the same time, the alternately arranged anodes and cathodes can be maintained and replaced separately without stopping the entire treatment system.

[0044] The metal particles are aluminum balls, which are hollow inside, with a diameter of 10 - 25 mm. The filling rate of the metal particles is set to 60 - 80%, and in this embodiment, it is set to 80%. By setting the metal particles to be hollow, the mass of the electrode ions is reduced, thereby increasing the disturbance effect during aeration and increasing the collision probability of the metal particles.

[0045] Furthermore, the power supply 4 is one of an AC power supply, a pulsed AC power supply, and a pulsed DC power supply, with a frequency of 10 - 80 Hz. Inside the hollow titanium basket electrode 7, the metal particles are under the action of an alternating electric field, and both electrodes on both sides are alternating anodes and cathodes. When the positive half - cycle of a sine wave is input, one electrode is the anode, and the other is the cathode. When the negative half - cycle of the sine wave is input, the polarities of the corresponding electrodes change, the original anode becomes the cathode, and the cathode becomes the anode. Under the action of the alternating current, the metal particles are electrochemically dissolved in the hollow titanium basket electrode 7. As the electrolysis time extends, the ion concentration in the solution rises, the conductivity is improved, and the current also gradually increases. The alternating current realizes the alternating change of the anode and cathode, that is, the current realizes periodic commutation, and the polarities of the electrodes constantly change, reducing the concentration polarization and effectively alleviating the passivation on the electrode surface. However, as time goes by, a passivation layer still appears.

[0046] Such as Figure 4As shown, under the action of the bubbles generated by the aeration device 8, the metal particles are scoured by the bubbles in the hollow titanium basket electrode 7. At the same time, the bubbles are subjected to an upward buoyancy force. Under the action of the bubbles, the metal particles move and collide continuously in the hollow titanium basket electrode 7, achieving the effect of timely removing the passivation layer on the surface of the metal particles. The convex holes 6 on the surface of the hollow titanium basket electrode 7 play a role in electrolyte mass transfer during the electrolysis process. The electrolyte solution enters the inside of the hollow titanium basket electrode 7 through the convex holes 6. During the upward movement of the bubbles generated by the aeration device 8, since vertical small holes are provided at the top of the hollow titanium basket electrode 7, and the movement trajectory of the bubbles through the convex holes 6 needs to go through a tortuous process from top to bottom and then upward, the relative resistance is relatively large. Therefore, most of the bubbles move upward inside the hollow titanium basket electrode 7 to disturb the electrode metal particles; part of the gas passes through the convex holes 6 on the surface of the hollow titanium basket electrode 7 to achieve the transfer and exchange of the electrolyte. Therefore, under the action of the bubbles generated by the aeration device in the hollow titanium basket electrode 7 of the device of the present invention, the movement and collision of the metal particle electrodes can achieve the passivation removal effect, and at the same time, the electrolyte transfer and exchange are realized through the convex holes 6 on the surface of the hollow titanium basket electrode 7, realizing the ion migration of the electrolysis reaction.

[0047] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly explaining the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A device for advanced treatment of wastewater, characterized in that: It includes an electrolytic cell, a hollow titanium basket electrode placed inside the electrolytic cell, and a power supply electrically connected to the hollow titanium basket electrode; there are at least a pair of the hollow titanium basket electrodes, which are filled with metal particles inside and are provided with an aeration device at the bottom.

2. The advanced wastewater treatment device according to claim 1, characterized in that: The aeration device includes an aeration pipe, and the aeration pipe is provided with aeration holes, and the aperture of the aeration holes is 10-25 mm.

3. The advanced wastewater treatment device according to claim 1, characterized in that: The surface of the hollow titanium basket electrode is provided with convex holes, and the aperture is 2-3 mm.

4. An advanced wastewater treatment device according to claim 3, characterized in that: The protruding direction of the convex holes is vertically downward.

5. A wastewater advanced treatment device according to claim 1, characterized in that: The top of the hollow titanium basket electrode is provided with a cover plate, and the cover plate is provided with connection terminals, and the connection terminals are connected to the power supply through wires.

6. The deep wastewater treatment device according to claim 5, characterized in that: The cover plate is provided with vertical small holes, and the aperture is 2-3 mm.

7. An advanced wastewater treatment device according to claim 1, characterized in that: The metal particles are iron particles or aluminum particles, are hollow inside, and have a diameter of 10-25 mm.

8. A wastewater advanced treatment device according to claim 1, characterized in that: The filling rate of the metal particles is 60-80%.

9. The advanced wastewater treatment device according to claim 1, wherein: The power supply is one of an alternating current power supply, a pulsed alternating current power supply, and a pulsed direct current power supply.

10. A wastewater advanced treatment device according to claim 1, characterized in that: The hollow titanium basket electrodes are arranged in sequence, and adjacent porous titanium basket electrodes are respectively connected to the positive and negative poles of the power supply through wires, and the adjacent spacing is 10-50 mm.

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