Electrolytic dephosphorization device and sewage treatment system

Abstract

The application relates to the technical field of sewage treatment equipment, and provides an electrolytic dephosphorization device and a sewage treatment system.The device comprises an electrolytic dephosphorization box body, a water inlet is arranged at the upper portion of the electrolytic dephosphorization box body, and a water outlet is arranged at the lower portion of the electrolytic dephosphorization box body; an electrode assembly comprises a plurality of polar plates, the plurality of polar plates are inserted into the electrolytic dephosphorization box body from top to bottom, and the plurality of polar plates are sequentially and parallelly arranged at intervals; an ultrasonic wave assembly comprises a shell and a plurality of ultrasonic transducers arranged in the shell; wherein the shell is arranged in the electrolytic dephosphorization box body and is arranged on one side or both sides of the plurality of polar plates and parallel to the polar plates; the emitting area of the ultrasonic wave assembly is greater than or equal to the side area of the polar plate; a uniform distribution mechanism is arranged at the upper portion of the electrolytic dephosphorization box body, and the water flow of the water inlet is uniformly distributed and dispersed to the area around each polar plate in the electrolytic dephosphorization box body through the uniform distribution mechanism. The device has compact structure and high integration, can effectively solve the problem of polar plate passivation, ensures stable release of iron ions and full utilization of the iron ions, and ensures the sewage dephosphorization treatment effect.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of sewage treatment equipment, and particularly relates to an electrolytic dephosphorization device and a sewage treatment system. BACKGROUND

[0002] The principle of electrolytic dephosphorization is that an electric field is applied between the electrode plates, and divalent iron ions are generated by iron electrolysis, which react with PO4 3+ In the sewage to generate stable iron phosphate and iron hydroxide precipitates, and the precipitates are removed through solid-liquid separation, so that the purpose of dephosphorization is achieved. Generally, the greater the voltage and current, the more iron ions are released, and the better the dephosphorization effect.

[0003] Among them, the electrode reaction formula is: anode, Fe-2e-=Fe 2+ ; cathode, 2H + +2e-=H2↑.

[0004] The chemical equation of the dephosphorization reaction is: 3Fe 2+ +2PO4 3- +H2O=Fe3(PO4)2·H2O; Fe3(PO4)2·H2O +1 / 2H2O +3 / 4O2=2FePO4+Fe(OH)3.

[0005] In the process of sewage dephosphorization treatment, an electrolytic dephosphorization device is usually used for electrolytic dephosphorization. In the use process of the existing electrolytic dephosphorization device, a thin protective layer, i.e. passivation film, is often formed on the surface of the electrode plate, which hinders electrolysis, affects the release of iron ions, and thus affects the dephosphorization reaction and the sewage treatment effect. In addition, the existing electrolytic dephosphorization device usually has problems such as complex structure, redundant and dispersed components, and inconvenient installation and operation. SUMMARY

[0006] In view of the above problems in the prior art, the application provides an electrolytic dephosphorization device and a sewage treatment system. The device has a compact structure and high integration, can effectively solve the problem of passivation of the electrode plate, ensure stable release of iron ions and full utilization of the iron ions, and ensure the sewage dephosphorization treatment effect.

[0007] The technical scheme adopted by the application is as follows:

[0008] An electrolytic dephosphorization device comprises:

[0009] An electrolytic dephosphorization box body, which is provided with a water inlet at the upper portion and a water outlet at the lower portion;

[0010] An electrode assembly, which comprises a plurality of electrode plates, the plurality of electrode plates are inserted into the electrolytic dephosphorization box body from top to bottom, and the plurality of electrode plates are arranged in parallel and at intervals in sequence;

[0011] An ultrasonic wave assembly, which comprises a shell and a plurality of ultrasonic transducers located in the shell;

[0012] wherein,

[0013] The shell is arranged in the electrolytic dephosphorization tank and located on one side or both sides of the plurality of plates in parallel with the plates; the emitting area of the ultrasonic wave assembly is greater than or equal to the side area of the plate;

[0014] The electrolytic dephosphorization tank is provided with a uniform distribution mechanism on the upper portion, and the water flow of the water inlet is uniformly distributed and dispersed through the area around each plate in the electrolytic dephosphorization tank through the uniform distribution mechanism.

[0015] In an embodiment of the present application, the uniform distribution mechanism comprises a homogenizing cavity arranged on one side of the upper portion of the electrolytic dephosphorization tank.

[0016] The water inlet is arranged on the homogenizing cavity.

[0017] The homogenizing cavity is in communication with the electrolytic dephosphorization tank through a plurality of water distribution holes, and the plurality of water distribution holes are arranged at intervals between the plurality of plates.

[0018] In an embodiment of the present application, the electrode assembly further comprises:

[0019] An equal number of insulating handles as the number of plates, the lower side of the insulating handle is provided with a plug-in slot matched with the upper end of the plate;

[0020] A copper bar arranged in the plug-in slot and in contact with the plate for conduction;

[0021] A waterproof plug arranged at one end of the insulating handle and connected with the copper bar through a conductive wire.

[0022] In an embodiment of the present application, the lower portion of the insulating handle is provided with a first limiting portion, and the upper portion of the electrolytic dephosphorization tank is provided with a matched second limiting portion, and the insulating handle can be detachably limited and installed on the electrolytic dephosphorization tank through cooperation of the first limiting portion and the second limiting portion.

[0023] In an embodiment of the present application, the electrode assembly has at least one of the following characteristics:

[0024] The plate comprises 2-6 plates;

[0025] The spacing between adjacent plates is 20-30 mm;

[0026] The thickness of the plate is 4-6 mm, the width is 170-200 mm, and the height is 600-700 mm.

[0027] In an embodiment of the present application, a direct current power supply of 0-200V is further included, and the positive and negative electrodes of the direct current power supply are switched through a relay, and the switching time is 10-30s.

[0028] In an embodiment of the present application, the operating frequency of the ultrasonic vibrator is 28-36 kHz.

[0029] And / or, the start-stop time interval of the ultrasonic vibrator is 1-5 minutes of operation and 30-60 minutes of shutdown.

[0030] In an embodiment of the present application, the ultrasonic assembly further comprises a power lead elbow extending upward from the shell.

[0031] The upper part of the power lead elbow is bent downward to communicate with the inside of the shell, and the power cord passes through the power lead elbow to connect the external power supply and the ultrasonic vibrator inside the shell.

[0032] In an embodiment of the present application, a sloping plate is arranged at the lower part of the electrolytic dephosphorization tank, and the water outlet is located on the upper side of the lower end of the sloping plate.

[0033] A sewage treatment system comprising the electrolytic dephosphorization device of any one of the above.

[0034] Further comprising an anoxic tank, an aerobic tank and a sedimentation tank / filter tank arranged in sequence.

[0035] The water outlet of the electrolytic dephosphorization device is connected to the aerobic tank or between the anoxic tank and the aerobic tank, and the water inlet of the electrolytic dephosphorization device is connected to the sedimentation tank or filter tank through a water pump to pump the supernatant of the sedimentation tank or the filtered liquid of the filter tank to the electrolytic dephosphorization device.

[0036] Compared with the prior art, the present application has the following advantages:

[0037] The electrolytic dephosphorization device of the present application is provided with an ultrasonic assembly on the side of each plate, and the ultrasonic emission area completely covers the plate. The adherents and passivation on the plate can be effectively removed by ultrasonic waves to prevent the passivation of the plate. At the same time, the low-frequency vibration of the ultrasonic waves can effectively avoid the capture of the iron ions released by electrolysis in water by the passivation, improve the utilization rate of the iron ions, and ensure the continuous and stable phosphorus removal effect. The water flows into the water inlet at the upper part and flows out of the water outlet at the lower part, and the water flow is uniformly distributed and dispersed around each plate to uniformly disperse the iron ions released by electrolysis into the water body, avoid the accumulation of iron ions between the plates, form a concentration difference polarization, and affect the stable progress of the phosphorus removal reaction. The device integrates each component through the electrolytic dephosphorization tank, has a compact structure, a small volume, is easy to install and maintain, and has high practicality. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative effort.

[0039] Figure 1 It is a perspective structural schematic diagram of the electrolytic dephosphorization device in the present application.

[0040] Figure 2 It is a sectional structural schematic diagram of the electrolytic dephosphorization device in the present application.

[0041] Figure 3 It is a top view structural schematic diagram of the electrolytic dephosphorization device in the present application.

[0042] Figure 4 It is a structural schematic diagram of the electrode assembly in the present application.

[0043] Figure 5 It is a perspective structural schematic diagram of the ultrasonic wave assembly in the present application.

[0044] Figure 6 It is a sectional structural schematic diagram of the ultrasonic wave assembly in the present application.

[0045] Figure 7 It is a structural schematic diagram of the sewage treatment system in the present application.

[0046] Reference signs:

[0047] 1, electrolytic dephosphorization tank; 11, water inlet; 12, water outlet; 13, homogenizing cavity; 131, water distribution hole; 14, second limiting part; 15, inclined plate;

[0048] 2, electrode assembly; 21, electrode plate; 22, insulating handle; 221, plug-in slot; 23, copper bar; 24, waterproof plug; 25, conductive wire; 26, first limiting part;

[0049] 3, ultrasonic wave assembly; 31, shell; 32, ultrasonic vibrator; 33, power lead elbow. DETAILED DESCRIPTION

[0050] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and description are considered to be exemplary in nature rather than limiting.

[0051] In the description of the application, it needs to be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the application is used, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0052] In the description of the application, "a plurality of" means two or more, unless otherwise explicitly specified and limited.

[0053] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection, or communication; it can be directly connected, or indirectly connected through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] In the present application, unless otherwise explicitly specified and limited, "on" or "under" the first feature of the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "above" of the first feature of the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0055] The following disclosure provides many different embodiments or examples for implementing different structures of the application. In order to simplify the disclosure of the application, the components and arrangements of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the application.

[0056] The embodiments of the application will be described in detail below with reference to the accompanying drawings.

[0057] As Figure 1 , Figure 2 and Figure 3As shown, the embodiment of the present application provides an electrolytic dephosphorization device, which comprises an electrolytic dephosphorization tank 1, an electrode assembly 2 and an ultrasonic assembly 3 installed on the electrolytic dephosphorization tank 1.

[0058] The electrolytic dephosphorization tank 1 has an upper opening, and a water inlet 11 and a water outlet 12 are arranged on the upper opening. The water inlet 11 is arranged at the upper part of the electrolytic dephosphorization tank 1, and the water outlet 12 is arranged at the lower part. The water flows into the electrolytic dephosphorization tank 1 from the upper part and flows out from the lower part, so that the water is subjected to electrolytic dephosphorization treatment.

[0059] The electrode assembly 2 comprises a plurality of electrode plates 21. The plurality of electrode plates 21 are inserted into the electrolytic dephosphorization tank 1 from the upper opening and are arranged in parallel and spaced apart in sequence, and the lower parts of the plurality of electrode plates 21 are suspended.

[0060] The ultrasonic assembly 3 comprises a sealed shell 31 and a plurality of ultrasonic transducers 32 arranged in the shell 31.

[0061] The shell 31 of the ultrasonic assembly 3 is arranged in the electrolytic dephosphorization tank 1 and is arranged on one side or both sides of the plurality of electrode plates 21 (i.e. one or two ultrasonic assemblies 3 are arranged). The shell 31 is arranged in parallel with the electrode plates 21, and the ultrasonic transducers 32 arranged in the shell 31 are uniformly distributed, so that the ultrasonic emission area of the ultrasonic assembly 3 is greater than or equal to the side area of the electrode plates 21, i.e. the ultrasonic waves emitted by the ultrasonic transducers 32 completely cover the area where the electrode plates 21 are arranged. Preferably, the shell 31 is made of 316L stainless steel or titanium alloy.

[0062] The electrolytic dephosphorization tank 1 further comprises a uniform distribution mechanism arranged at the upper part. The uniform distribution mechanism uniformly disperses the water flow of the water inlet 11 into the electrolytic dephosphorization tank 1 and uniformly flows through the area around each electrode plate 21. That is, the water flow is dispersed by the uniform distribution mechanism, and the water flow uniformly flows through the space around all the electrode plates 21 from the upper part.

[0063] In summary, the electrolytic dephosphorization device is provided with the ultrasonic assembly 3 on the side of the plurality of electrode plates 21, and the ultrasonic emission area completely covers the electrode plates 21. The adhering substances and passivation substances on the electrode plates 21 can be effectively removed by the ultrasonic waves, the passivation of the electrode plates 21 is prevented, the low-frequency vibration of the ultrasonic waves can effectively avoid the iron ions released by electrolysis from being captured by the passivation substances in the water, the utilization rate of the iron ions is improved, the dephosphorization effect is ensured to be continuous and stable, the water flow uniformly disperses and flows through the area around each electrode plate 21 by the upper inlet and lower outlet mode, the iron ions released by electrolysis are uniformly dispersed into the water body, the accumulation of the iron ions between the electrode plates 21 is avoided, the concentration difference polarization is avoided, the stable dephosphorization reaction is ensured, the components are integrated and assembled by the electrolytic dephosphorization tank 1, the structure is compact, the volume is small, the device is easy to install and maintain, and the practicality is high.

[0064] As shown in the drawings, Figure 1As shown, in an embodiment, the uniform distribution mechanism specifically comprises an open homogenizing cavity 13 arranged on one side of the upper portion of the electrolytic dephosphorization tank 1; the water inlet 11 is arranged on the homogenizing cavity 13, and the homogenizing cavity 13 is communicated with the electrolytic dephosphorization tank 1 through a plurality of water distribution holes 131. The plurality of water distribution holes 131 are arranged horizontally and are arranged in turn and spaced apart from the plurality of polar plates 21. That is, at least one water distribution hole 131 is arranged adjacent to both sides of any polar plate 21 to ensure that the water flow is dispersed to flow through each region space separated by all the polar plates 21. The arrangement of the homogenizing cavity 13 and the water distribution hole 131 can stabilize the flow and uniformly distribute the incoming water flow, avoid the water flow of the water inlet 11 directly entering the polar plate 21 to cause impact, improve the stability of the water flow in the electrolytic dephosphorization tank 1, and ensure the electrolytic dephosphorization effect. While stabilizing the flow, the homogenizing cavity 13 can discharge air bubbles in the water flow to a certain extent, reduce the influence of air bubbles on the voltage in the electrolytic dephosphorization process (air bubbles are easy to cause irregular voltage fluctuations), and make the voltage control of the equipment more stable.

[0065] As shown in Figures 1 to 4 , the electrode assembly 2 further comprises an insulating handle 22, a copper bar 23, a waterproof plug 24, and the like.

[0066] The number of the insulating handle 22 is equal to that of the polar plate 21, and each polar plate 21 is provided with one insulating handle 22. Specifically, the insulating handle 22 can be injection molded by plastic, has an anti-slip gripping portion at the upper portion, and is provided with a plug-in slot 221 at the lower portion, which is adapted to the upper end of the polar plate 21 for plug-in installation of the polar plate 21.

[0067] The copper bar 23 is arranged on the inner wall of the plug-in slot 221, and when the polar plate 21 is plug-in installed with the insulating handle 22, the copper bar 23 can be in contact with the polar plate 21 for conduction.

[0068] The waterproof plug 24 is arranged on one end side of the insulating handle 22 and is connected with the copper bar 23 through a conductive wire 25. The waterproof plug 24 is used for connection with an external power supply, and the power supply path is in sequence as follows: power supply-waterproof plug 24-conductive wire 25-copper bar 23-polar plate 21.

[0069] The arrangement of the plug-in slot 221, the copper bar 23, and the like facilitates the installation and replacement operation of the polar plate 21, and the conductive wire does not need to be frequently connected to the polar plate 21 every time the polar plate 21 is replaced, which greatly simplifies the installation operation and makes the use more safe.

[0070] Further, as shown in Figure 1 and Figure 4As shown, the lower part of the insulating handle 22 is provided with a first limiting part 26, and the upper part of the electrolytic dephosphorization tank 1 is provided with a second limiting part 14 matched with the first limiting part 26. The insulating handle 22 is detachably and limitingly installed at the notch of the electrolytic dephosphorization tank 1 through the cooperation of the first limiting part 26 and the second limiting part 14. The first limiting part 26 and the second limiting part 14 can be a matched tooth and groove structure. The first limiting part 26 and the second limiting part 14 are arranged to facilitate the positioning and installation of the electrode plate 21, so that the daily maintenance operation is more simple and convenient.

[0071] Preferably, the electrode plate 21 includes 2-6 pieces, for example, 2, 4 or 6 pieces. When the number of electrode plates 21 is greater than 2, the leftmost and rightmost electrode plates 21 are electrode plates, and the intermediate electrode plates are reaction electrode plates.

[0072] Preferably, the spacing between adjacent electrode plates 21 is 20-30 mm.

[0073] Preferably, the thickness of the electrode plate 21 is controlled to be 4-6 mm, the width is 170-200 mm, and the height is 600-700 mm.

[0074] In one real-time mode, the electrolytic dephosphorization device further includes a direct current power supply with a voltage of 0-200 V, and the positive and negative electrodes of the direct current power supply are switched through a relay with a switching time of 10-30 s, i.e., the positive and negative electrode directions of the current are switched once every 10-30 s.

[0075] Further, preferably, the control voltage is in the range of 90-200 V, and the spacing between adjacent electrode plates 21 is 25-30 mm. This can better avoid the polarization of the concentration difference between the electrode plates 21 hindering the diffusion and transfer performance of each ion, and ensure the dephosphorization effect.

[0076] The working frequency of the ultrasonic vibrator 32 in the ultrasonic assembly 3 is controlled to be between 28 KHz and 36 KHz. The start-stop time interval of the ultrasonic vibrator 32 is controlled to be 1-5 min for working and 30-60 min for stopping; that is, when running, the ultrasonic wave is emitted for 1-5 min, and then stopped for 30-60 min; for example, the ultrasonic wave is emitted for 3 min and stopped for 30 min, then the ultrasonic wave is emitted for 3 min again, and then stopped, and the cycle is repeated. The ultrasonic vibrator 32 emits ultrasonic waves intermittently to remove the passivation of the electrode plate 21, while avoiding the capture of iron ions by the detached passivation.

[0077] As shown in FIG. 1, the electrolytic dephosphorization device includes an electrolytic dephosphorization tank 1, an ultrasonic assembly 3, a power supply assembly 4, and a control assembly 5. Figure 2 , Figure 5 and Figure 6As shown, the ultrasonic assembly 3 is also provided with a power lead elbow 33 extending upward from the shell 31, the lower part is sealingly connected with the shell 31, and the upper part is bent downward to communicate with the inside of the shell 31, for the power line to pass through to connect the external power supply and the ultrasonic vibrator 32 inside the shell 31. The setting of the power lead elbow 33 can effectively prevent rainwater from entering the shell 31, improve the safety performance, and make the installation and use of the ultrasonic assembly 3 adapt to the installation of the outdoor electrolytic dephosphorization device.

[0078] As shown in Figure 2 The electrolytic dephosphorization tank 1 is provided with an inclined plate 15 at the lower part, and the water outlet 12 is located on the upper side of the lower end of the inclined plate 15. The setting of the inclined plate 15 cooperates with the water outlet 12 to effectively prevent impurities from accumulating in the electrolytic dephosphorization tank 1, and to ensure efficient and continuous electrolytic dephosphorization.

[0079] In another embodiment, as shown in Figure 7 The present application also provides a sewage treatment system, which comprises the above-mentioned electrolytic dephosphorization device; further comprises an anoxic tank, an aerobic tank and a sedimentation tank arranged in sequence; or an anoxic tank, an aerobic tank and a filter tank arranged in sequence.

[0080] The electrolytic dephosphorization device is arranged in the aerobic tank or between the anoxic tank and the aerobic tank, such as at the outlet of the anoxic tank or at the inlet of the aerobic tank, so that the water outlet 12 of the electrolytic dephosphorization device is connected to the aerobic tank or between the anoxic tank and the aerobic tank, and the water flow discharged from the electrolytic dephosphorization device enters the aerobic tank in sequence for aeration mixing. The water inlet 11 of the electrolytic dephosphorization device is connected with the sedimentation tank or the filter tank through a water pump, for pumping the supernatant of the sedimentation tank or the filtered liquid of the filter tank to the electrolytic dephosphorization device as an electrolytic medium. When water is taken from the sedimentation tank, the water pump is preferably located at a depth of 200-300 mm below the liquid level of the sedimentation tank.

[0081] The electrolytic dephosphorization device of the sewage treatment system pumps the supernatant of the sedimentation tank or the filtered liquid of the filter tank (the supernatant or filtered liquid contains <0.5 mg / L of phosphorus and <20 mg / L of suspended solids) to form an internal circulation water flow as an electrolytic reaction medium, and the electrolytic iron ions are fully mixed into the water flow to avoid being captured by passivation products or accumulating with pollutants, so that the utilization rate of iron ions is high; the electrolytic dephosphorization device is arranged in the aerobic tank or between the anoxic tank and the aerobic tank, and the iron ions and water flow discharged from the water outlet thereof enter the aerobic tank, and in the aerobic tank, the iron ions and sulfate ions are fully reacted to generate iron sulfate or iron hydroxide precipitate through aeration stirring and mixing, so that a better dephosphorization effect is achieved.

[0082] In summary, the electrolysis reaction of the system is carried out in an independent space, and clean water is used as the medium. The iron ions generated by electrolysis flow into the aerobic tank with water to carry out the phosphorus removal reaction. The electrolysis reaction is not affected by aeration and sludge. The release of iron ions is stable, the utilization rate is high, and the phosphorus removal reaction is sufficient and efficient. When running, the total phosphorus of 8 mg / L and below can be treated to below 0.5 mg / L.

Claims

1. An electrolytic phosphorus removal device, characterized in that, include: The electrolytic phosphorus dissolving tank (1) has an upper opening with an inlet (11) at the top and an outlet (12) at the bottom. The electrode assembly (2) includes multiple electrode plates (21), which are inserted into the electrolytic phosphorus dissolving box (1) from top to bottom, and the multiple electrode plates (21) are arranged in parallel intervals in sequence. The ultrasonic component (3) includes a housing (31) and a plurality of ultrasonic transducers (32) located within the housing (31). in, The housing (31) is located inside the electrolytic phosphorus dissolution box (1), on one or both sides of the multiple electrode plates (21), and parallel to the electrode plates (21); the emission area of ​​the ultrasonic component (3) is greater than or equal to the side area of ​​the electrode plate (21), and the ultrasonic waves emitted by the ultrasonic transducer completely cover the area where the electrode plate is located. The upper part of the electrolytic dephosphorization tank (1) is provided with a uniform distribution mechanism. The water from the inlet (11) flows through the uniform distribution mechanism and is evenly distributed and dispersed through the area around each electrode plate (21) in the electrolytic dephosphorization tank (1). The uniform distribution mechanism includes a homogenization chamber located on one side of the upper part of the electrolytic phosphate dissolving tank; the water inlet is located on the homogenization chamber; the homogenization chamber is connected to the electrolytic phosphate dissolving tank through multiple water distribution holes, and the multiple water distribution holes are spaced apart from multiple electrode plates. The lower part of the electrolytic phosphorus dissolving tank is provided with an inclined plate, and the water outlet is located on the upper side of the lower end of the inclined plate. The electrode assembly further includes: an insulating handle equal in number to the electrode plates, with a plug groove on the lower side of the insulating handle that is adapted to the upper end of the electrode plate; a copper busbar, which is disposed in the plug groove and conducts electricity in contact with the electrode plate; a waterproof plug, which is disposed at one end of the insulating handle and connected to the copper busbar via a conductive wire; and the insulating handle is detachably and limitly installed at the groove of the electrolytic phosphorus dissolution box.

2. The electrolytic phosphorus removal device according to claim 1, characterized in that, The insulating handle (22) is provided with a first limiting part (26) at the lower part, and the electrolytic dephosphorization box (1) is provided with a matching second limiting part (14) at the upper part. The insulating handle (22) is detachably limited and installed on the electrolytic dephosphorization box (1) through the cooperation of the first limiting part (26) and the second limiting part (14).

3. The electrolytic phosphorus removal device according to claim 1, characterized in that, The electrode assembly (2) has at least one of the following characteristics: The electrode plate (21) comprises 2-6 pieces; The spacing between adjacent electrode plates (21) is 20-30 mm; The electrode plate (21) has a thickness of 4-6 mm, a width of 170-200 mm, and a height of 600-700 mm.

4. The electrolytic phosphorus removal apparatus according to claim 1 or 3, characterized in that, It also includes a 0-200V DC power supply, the positive and negative terminals of which are switched by a relay, with a switching time of 10-30 seconds.

5. The electrolytic phosphorus removal device according to claim 1, characterized in that, The ultrasonic transducer (32) operates at a frequency of 28KHz-36KHz; And / or, the start-stop time interval of the ultrasonic transducer (32) is: 1-5 min for operation and 30-60 min for shutdown.

6. The electrolytic phosphorus removal apparatus according to claim 1 or 5, characterized in that, The ultrasonic component (3) also includes a power lead-out bend (33) extending upward from the housing (31). The upper part of the power lead-out bend (33) bends downward and connects to the inside of the housing (31), allowing the power line to pass through the ultrasonic transducer (32) that connects the external power source and the inside of the housing (31).

7. A wastewater treatment system, characterized in that, Includes the electrolytic dephosphorization apparatus as described in any one of claims 1 to 6; It also includes an anoxic tank, an aerobic tank, and a sedimentation / filter tank arranged in sequence; The outlet (12) of the electrolytic phosphorus removal device is connected to the aerobic tank or between the anoxic tank and the aerobic tank. The inlet (11) of the electrolytic phosphorus removal device is connected to the sedimentation tank or filter tank via a water pump, and the supernatant of the sedimentation tank or the filtrate of the filter tank is pumped to the electrolytic phosphorus removal device.

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