Trickle bed type wastewater degradation device and method

Abstract

The invention discloses a trickle bed type wastewater degradation device and a trickle bed type wastewater degradation method, and relates to the technical field of wastewater treatment equipment.The electrode distribution and the reactor structure are improved, so that uncharged or positively charged substances in wastewater are in full contact with an anode electrode, and the reaction degradation effect is effectively improved; according to the scheme, the trickle bed type wastewater degradation device comprises an electrolytic bath body and a bath cover arranged on the electrolytic bath body, at least one electrolysis chamber and a water storage chamber are arranged in the electrolytic bath body, and wastewater treated by the electrolysis chamber overflows to the water storage chamber after being fully stored; the tank cover comprises a tank cover cavity, a first electrode mounting hole group is formed in the tank cover cavity, cathode electrodes and anode electrodes are sequentially and alternately arranged in the first electrode mounting hole group, and the cathode electrodes and the anode electrodes penetrate through the electrode mounting holes to extend into the electrolysis chamber; and a dripping hole is also formed in the mounting hole of the anode electrode.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment equipment, and in particular to a trickling bed type wastewater degradation device. Background Art

[0002] With the rapid growth of industries such as petrochemicals, pharmaceuticals, pesticide synthesis and dye manufacturing, the types of difficult-to-biodegrade organic compounds appearing in domestic wastewater, industrial wastewater or landfill leachate continue to surge, and their negative impact on ecosystems and human health is also expanding, becoming an environmental problem that needs to be solved urgently.

[0003] Research shows that electrochemical catalytic oxidation, one of the advanced oxidation technologies that has been gradually applied in recent years, has the advantages of low catalyst usage, easy scale and intelligent production, simple operation, and no secondary pollution. It is called an environmentally friendly technology and can achieve the triple goals of energy saving, carbon reduction, and production capacity. However, due to the limitations of electrolysis device design technology, some uncharged or positively charged substances cannot reach the anode, and the treatment efficiency of organic wastewater is not high, which affects the wastewater treatment effect. Summary of the invention

[0004] 1. Technical Problems Solved

[0005] In view of the deficiencies in the prior art, the present invention proposes a trickle bed wastewater degradation device and method, which enables uncharged or positively charged substances in the wastewater to fully contact the anode electrode by improving the electrode distribution, the reactor structure and the degradation method, thereby improving the reaction efficiency of the anode.

[0006] 2. Specific technical solutions

[0007] A trickle bed type wastewater degradation device comprises an electrolytic cell body and a cell cover arranged on the electrolytic cell body, wherein at least one electrolytic chamber and a water storage chamber are arranged in the electrolytic cell body, and wastewater treated in the electrolytic chamber overflows into the water storage chamber after being full; the cell cover comprises a cell cover cavity, in which a first electrode mounting hole group is arranged, in which cathode electrodes and anode electrodes are alternately arranged in sequence, and both the cathode electrodes and the anode electrodes extend into the electrolytic chamber through the electrode mounting holes; a trickle hole is also arranged at the mounting hole of the anode electrode.

[0008] Implementation principle and working principle:

[0009] The implementation principle of this scheme is to first install the cathode electrode and the anode electrode alternately in the first electrode installation hole group in sequence, and then introduce the wastewater to be treated into the tank cover cavity, and the wastewater will flow from the anode electrode into the electrolysis chamber through the drip hole at the anode electrode in the tank cover cavity, wherein the anode electrode and the cathode are energized in the electrolysis chamber to perform wastewater degradation electrolysis; wherein, since the wastewater enters the electrolysis chamber directly from the anode electrode, the uncharged or negatively charged substances in the wastewater can fully participate in the reaction at the anode electrode, and the remaining or reacted positively charged substances can fully contact the anode electrode, so that the electrical properties of the anode are enhanced and the reaction efficiency is higher; after the treated wastewater in the electrolysis chamber is full, it will overflow into the water storage chamber for water storage; compared with the conventional existing technology, the positively charged substances can participate in the reaction at the anode without the need for an external electric field, and the cost is lower.

[0010] Preferably, it also includes a circulating water pump, the water inlet end of the circulating water pump is connected to the bottom of the water storage chamber through a pipe, and the water outlet end of the circulating water pump is connected to the tank cover cavity through a pipe; the beneficial effect of this preferred embodiment is that the wastewater in the water storage chamber can be continuously guided back to the tank cover for circulation treatment through the circulating water pump, and the degradation effect is better.

[0011] Preferably, a cover plate is provided on the upper portion of the tank cover cavity, a pipe installation hole is provided on the cover plate, and a pipe connected to the water outlet of the circulating water pump extends into the tank cover cavity through the pipe installation hole.

[0012] Preferably, a water baffle is provided in the tank cover cavity, and there are multiple water baffles, which are arranged around the electrode mounting hole. The beneficial effect of this preferred embodiment is that the water baffle is provided to prevent waste water from infiltrating into the electrolysis chamber from the electrode mounting hole, thereby reducing the contact between uncharged or positively charged substances and the anode electrolysis, which affects the reaction effect.

[0013] Preferably, the electrolytic cell body includes two groups of oppositely arranged side plates, and a first partition plate and a second partition plate are arranged between any group of oppositely arranged side plates; the electrolytic chamber includes a first electrolytic chamber and a second electrolytic chamber, the first electrolytic chamber is formed by connecting the first partition plate and the side plate, and the second electrolytic chamber is formed by connecting the first partition plate and the second partition plate to the side plate respectively, wherein the upper end height of the second partition plate is lower than that of the first partition plate; the beneficial effect of this preferred embodiment is that the first electrolytic chamber, the second electrolytic chamber and the water storage chamber can be isolated by setting the side plates and the first partition plate and the second partition plate, and the structure is simple; the setting of the upper end height of the second partition plate and the upper end height of the first partition plate can avoid the backflow of treated wastewater and affect the treatment effect.

[0014] Preferably: a second electrode mounting hole group is also provided on the tank cover, the first electrode mounting hole group corresponds to the first electrolysis chamber, and the second electrode mounting hole group corresponds to the second electrolysis chamber; the beneficial effect of this preferred embodiment is that the electrodes arranged by the first electrode mounting hole group and the second electrode mounting hole group can well treat the sewage in the first electrolysis chamber and the second electrolysis chamber in turn, and the treatment effect is better.

[0015] Preferably, a water retaining plate is also provided around the outer side of each electrode mounting hole of the second electrode mounting hole group, and the cathode electrodes and anode electrodes alternately arranged in the second electrode mounting hole group extend into the second electrolysis chamber.

[0016] Preferably, the anode electrode of the first electrode mounting hole group has multiple drip holes, and a guide groove is also opened in the bottom plate of the groove cover, and the guide groove is located directly below the drip hole, which is used to guide the wastewater to the anode electrode; the beneficial effect of this preferred embodiment is that when the drip hole drips wastewater, it will preferably drip into the guide groove, and under the action of the guide groove, the wastewater will be fully guided to the anode electrode, avoiding splashing of wastewater in the electrolysis chamber during dripping.

[0017] Preferably, an overflow tube is also provided on the tank cover, and the overflow channel in the overflow tube is connected to the water storage chamber. The beneficial effect of this preferred embodiment is that when the wastewater level in the tank cover cavity is too high, the wastewater will flow back to the water storage chamber through the overflow channel of the overflow tube.

[0018] The beneficial effects of the device in the present invention are:

[0019] The structural arrangement of the tank cover and the structural arrangement of the electrolytic tank body of the present scheme can allow the wastewater to drip from the drip hole onto the anode electrode, so that during degradation, the negatively charged or neutral substances in the wastewater are directly reflected on the anode electrode, and the reaction speed is better, and the positively charged substances left behind can enhance the effect of the anode; at the same time, the treatment is carried out in a dripping manner, and the wastewater flows downward continuously in the form of a thin liquid film. The liquid layer formed by this dripping manner is very thin, the total liquid layer mass transfer resistance is small, and the reaction area is large, so that the neutral or positively charged difficult-to-degrade organic compounds in the wastewater can be more fully in contact with the anode electrode, thereby enhancing the effect of the anode electrode and improving the degradation efficiency.

[0020] A trickling bed wastewater degradation method, using the above-mentioned trickling bed wastewater degradation device to degrade wastewater, comprises the following steps:

[0021] S1, assembling the wastewater degradation device, wherein the spacing between the cathode electrode and the anode electrode in each group of electrode mounting holes is set to 1-3 cm; and configuring the supply current and supply voltage of the electrodes, wherein the DC current passed is 0.02-2A, and the DC voltage is 10V-30V;

[0022] S2. A sufficient amount of wastewater to be degraded is introduced into the electrolytic cell cover cavity, wherein the liquid level of the degraded wastewater does not exceed the height of the overflow tube; the wastewater to be degraded is a chemical derivative that is electrically neutral or has a cationic group in the aqueous solution, and the chemical derivative includes acetaminophen, 2-(methylamino)benzoic acid, and methyl anthranilate;

[0023] S3, the wastewater to be degraded will enter the guide groove from the drip hole under the action of water pressure and gravity, and under the action of the guide groove and the drip hole, the wastewater to be degraded will enter the electrolysis chamber along the anode electrode in the form of a thin film liquid for electrolytic degradation;

[0024] S4. When the wastewater treated in the electrolysis chamber exceeds the height of the electrolysis chamber, it will overflow into the water storage chamber. When the wastewater in the water storage chamber reaches the set value, the treated wastewater is circulated multiple times by the circulating water pump and passed into the tank cover cavity.

[0025] The beneficial effects of this method are:

[0026] In step S1, the spacing between the positive and negative electrodes is set to 1-3 cm. If this spacing is set too small, there is a risk of short circuit between the electrodes, and if the spacing is too large, the electrolysis efficiency will be reduced. Therefore, the setting of this spacing parameter can maximize the electrolysis efficiency while ensuring the safety of electrolysis; under the action of the electrode current and voltage of this value, it is more conducive to the treatment of chemical derivatives that are electrically neutral or have cationic groups in step S2. In step S4, the waste in the waste can be degraded to a great extent through multiple cycles. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a side cross-sectional schematic diagram of a single electrolytic chamber of the trickle bed wastewater degradation device of this scheme.

[0028] Figure 2 This is a side cross-sectional diagram of the double electrolysis chamber of the trickle bed wastewater degradation device of this scheme.

[0029] Figure 3 This is the axonometric view of the tank cover of the trickling bed wastewater degradation device of this scheme.

[0030] Figure 4 This is an axonometric schematic diagram of the electrolytic cell body of the trickle bed wastewater degradation device of this scheme.

[0031] Figure 5 This is a top view of the tank cover of the trickle bed wastewater degradation device of this scheme.

[0032] Figure 6 This is a diagram showing the optimal implementation effect of treating acetaminophen chemical wastewater in specific embodiment 1.

[0033] Figure 7This is a diagram showing the optimal implementation effect of treating 2-(methylamino)benzoic acid wastewater in specific embodiment 2.

[0034] Figure 8 This is a diagram showing the optimal implementation effect of treating methyl anthranilate wastewater in specific embodiment 3.

[0035] Description of reference numerals:

[0036] Electrolytic cell body 100, electrolytic chamber 101, water storage chamber 102, circulating water pump 103, first partition 104, second partition 105, first electrolytic chamber 106, second electrolytic chamber 107, side plate 108, tank cover 200, tank cover cavity 201, first electrode mounting hole group 202, cathode electrode 203, anode electrode 204, drip hole 205, cover plate 206, pipeline mounting hole 207, water retaining plate 208, second electrode mounting hole group 209, bottom plate 210, guide groove 211, overflow cylinder 212. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more explicit definition of the protection scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Examples, such as Figure 1-Figure 5 As shown:

[0039] When implementing, Figure 1 and 2 As shown, a trickle bed type wastewater degradation device includes an electrolytic cell body 100 and a cell cover 200 installed on the electrolytic cell body 100. An electrolytic chamber 101 and a water storage chamber 102 are arranged on the left side of the electrolytic cell body 100. When the electrolytic cell body 100 is used, the wastewater treated in the electrolytic chamber 101 will overflow from the right side of the electrolytic chamber 101 to the water storage chamber 102 after being filled. Specifically, the cell cover 200 includes a cell cover cavity 201, such as Figure 5 , a first electrode mounting hole group 202 is provided in the slot cover cavity 201; Figure 3 , cathode electrodes 203 and anode electrodes 204 are alternately arranged in the first electrode mounting hole group 202. In this solution, the cathode electrodes 203 and the anode electrodes 204 are fixed in the first electrode mounting hole group 202 by means of a clamping connection. Specifically, the cathode electrodes 203 and the anode electrodes 204 are extended into the electrolysis chamber 201 through the electrode mounting holes 202 and the bottom plate 210 of the tank cover; Figure 4 and Figure 5 A plurality of drip holes 205 are provided on both sides of the mounting hole of the anode electrode 204 , and a guide groove 211 is provided at the bottom of the drip hole 205 .

[0040] The structural arrangement of the tank cover 200 and the structural arrangement of the electrolytic tank body 100 of the present scheme can allow the wastewater to drip from the drip hole 205 to the guide groove 211 and then be guided to the anode electrode 204, so that the uncharged or positively charged substances in the wastewater can fully contact the anode electrode 204, and the treatment effect is better; at the same time, the treatment is carried out in a dripping manner, and the wastewater flows downward continuously in the form of a thin liquid film. The liquid layer formed by this dripping method is very thin, the total liquid layer mass transfer resistance is small, and the reaction area is large, so that the neutral or positively charged difficult-to-degrade organic compounds in the wastewater can more fully contact the anode electrode 204, thereby enhancing the effect of the anode electrode 204 and improving the degradation efficiency.

[0041] like Figure 1 In the specific implementation, in order to further improve the degradation effect, the trickle bed wastewater degradation device also includes a circulating water pump 103, which can be installed in the electrolytic cell body 100 or outside it, wherein the water inlet end of the circulating water pump 103 is connected to the bottom of the water storage chamber 102 through a pipeline, and the water outlet end of the circulating water pump 103 is connected to the tank cover cavity 201 through a pipeline, wherein Figure 2 In order to facilitate the installation of pipelines, a pipeline installation hole 207 is opened on the cover plate 206 on the upper part of the tank cover cavity 201. The pipeline connected to the water outlet end of the circulating water pump 103 extends into the tank cover cavity 201 through the pipeline installation hole 207. The setting of the circulating water pump can allow the wastewater to be electrolyzed multiple times, with better results.

[0042] When implementing, Figure 2 A water baffle 208 is integrally formed in the tank cover cavity 201. There are multiple water baffles 208, and the water baffles 208 are installed around each mounting hole of the first electrode mounting hole group 202. The setting of the water baffles 208 effectively prevents waste water from infiltrating into the electrolysis chamber 101 from the electrode mounting hole 202, reducing the contact between uncharged or positively charged substances and the anode electrolysis, which affects the reaction effect.

[0043] During implementation, in order to further improve the wastewater treatment effect, such as Figure 2 and Figure 4, a first electrolysis chamber 106 and a second electrolysis chamber 107 are arranged in the electrolysis cell body 101, and the wastewater is subjected to secondary electrolysis through the two electrolysis chambers respectively, so that the treatment efficiency is higher; specifically, the electrolysis cell body 101 includes two sets of side plates 108 arranged opposite to each other to form a cubic cell body, and a first partition plate 104 and a second partition plate 105 are integrally formed between any set of side plates 108 arranged opposite to each other; wherein, the first electrolysis chamber 106 is formed by connecting the first partition plate 104 and the side plate 108, and the second electrolysis chamber 1 07 is formed by connecting the first partition 104 and the second partition 105 with the side plate 108 respectively, wherein the upper end height of the second partition 105 is lower than the upper end height of the first partition 104; the first electrolytic chamber 106, the second electrolytic chamber 107 and the water storage chamber 102 can be isolated by setting the side plate and the first partition 104 and the second partition 105, and the structure is simple; the upper end height of the second partition 105 is the same as the upper end height of the first partition 104, and this setting can avoid the backflow of treated wastewater and affect the treatment effect.

[0044] During implementation, in order to correspond to the second electrolytic chamber 107, a second electrode mounting hole group 209 is provided at a corresponding position on the tank cover 200, the first electrode mounting hole group 202 corresponds to the first electrolytic chamber 106, and the second electrode mounting hole group 202 corresponds to the second electrolytic chamber 107, wherein the second electrode mounting hole group 209 does not need to be provided with a drip hole, and the corresponding second electrolytic chamber 107 is used to treat the wastewater overflowed from the first electrolytic chamber 106, and the electrodes provided by the first electrode mounting hole group 202 and the second electrode mounting hole group 209 can well treat the sewage in the first electrolytic chamber 106 and the second electrolytic chamber 107 in sequence, and the treatment effect is better. Specifically, the spacing between the cathode electrode 203 and the anode electrode 204 is 1cm-1.5cm. If this spacing is set too small, there is a risk of short circuit between the electrodes, and too large a spacing will reduce the electrolysis efficiency. Therefore, the setting of this spacing parameter can maximize the electrolysis efficiency while ensuring the safety of electrolysis.

[0045] A water retaining plate 208 is also arranged around the outer side of each electrode mounting hole of the second electrode mounting hole group 209 , and the cathode electrodes 203 and the anode electrodes 204 alternately arranged in the second electrode mounting hole group 209 extend into the second electrolytic chamber 107 .

[0046] When implementing, if attached Figure 2 As shown, an overflow tube 212 is integrally formed on the tank cover 200, and an overflow channel is opened in the middle of the overflow tube. The overflow channel connects the water storage chamber 102 and the tank cover cavity 201. When the wastewater level in the tank cover cavity 201 is too high, the wastewater will flow back to the water storage chamber 102 through the overflow channel of the overflow tube 212.

[0047] This scheme also provides a trickle bed wastewater degradation method, which uses a trickle bed wastewater degradation device to degrade wastewater, including the following steps:

[0048] S1, assembling the wastewater degradation device, wherein the spacing between the cathode electrode 203 and the anode electrode 204 in each group of electrode mounting holes is set to 1-3 cm, preferably 1.5 cm in this scheme; and configuring the supply current and supply voltage of the electrode, wherein the DC current passed is 0.02-2A, and the DC voltage is 10V-30V;

[0049] S2, introducing a sufficient amount of wastewater to be degraded into the tank cover cavity 201, wherein the liquid level of the degraded wastewater does not exceed the height of the overflow tube 201; the introduced wastewater to be degraded is a chemical derivative that is electrically neutral or has a cationic group in the aqueous solution, and the chemical derivative includes acetaminophen, 2-(methylamino)benzoic acid, and methyl anthranilate;

[0050] S3, the introduced wastewater to be degraded will enter the guide groove 211 from the drip hole under the action of water pressure and gravity, and under the action of the guide groove 211 and the drip hole 205, the wastewater to be degraded will enter the electrolysis chamber 101 in the form of a thin film liquid along the anode electrode 204 for electrolytic degradation, wherein the flow rate of the wastewater on the anode electrode 204 is preferably 0.5-0.7mL / s, and the flow rate setting can cover the anode electrode 204 and form a continuous and uninterrupted water flow, thereby ensuring the continuity of the waste liquid reaction on the anode electrode, and can also ensure sufficient reaction time while increasing the wastewater circulation speed;

[0051] S4, when the wastewater treated in the electrolysis chamber 101 exceeds the height of the electrolysis chamber 101, it will overflow into the water storage chamber. When the wastewater in the water storage chamber reaches the set value, the treated wastewater is circulated multiple times by the circulating water pump 103 and passed into the tank cover cavity 201;

[0052] When step S4 is implemented, a controller and a liquid level sensor may also be provided, wherein there are two groups of liquid level sensors, which are respectively provided in the water storage chamber 102 and the tank cover cavity 201, and the controller is electrically connected to the liquid level sensor and the circulating water pump, respectively. The controller controls the operation of the circulating water pump according to the liquid level signal, and controls the circulating water pump so that the liquid level in the tank cover cavity 201 is maintained within a set range, thereby being able to control the dripping speed of the wastewater in the drip hole 205, so that the flow speed of the wastewater on the anode electrode is always within the optimal reaction range.

[0053] The beneficial effects of this method are:

[0054] In step S1, the spacing between the cathode electrode 203 and the anode electrode 204 is set to 1-3 cm. If this spacing is set too small, there will be a risk of short circuit between the electrodes, while too large a spacing will reduce the electrolysis efficiency. Therefore, the setting of this spacing parameter can maximize the electrolysis efficiency while ensuring the safety of electrolysis; under the action of the electrode current and voltage in this numerical range, it is more conducive to the treatment of chemical derivatives that are electrically neutral or have cationic groups in step S2. In step S4, the waste in the waste can be degraded to a great extent through multiple cycles. Specific embodiment 1:

[0056] The trickle bed wastewater degradation device of the present scheme is used to treat acetaminophen chemical wastewater, wherein the anode is a tin-loaded titanium mesh (150×50×1 mm) and the cathode is a pure titanium mesh (150×50×1 mm).

[0057] The specific steps are as follows:

[0058] First, 2L of acetaminophen wastewater with different concentrations is taken and passed into the tank cover cavity 201. The wastewater will enter the electrolysis chamber 101 from the drip hole 205 of the anode electrode 204, and the flow rate of the wastewater on the anode electrode is controlled to be 0.1-0.7mL / s. Different electrolysis currents and voltages are set before the wastewater is passed, and the power is turned on for 20 hours, and then tested;

[0059] Among them, the best group is as follows Figure 6 As shown, the current is preferably 1A, the voltage is preferably 20V, the optimal concentration is 18mg / L, the flow rate of the wastewater on the anode electrode is 0.6mL / s, and the COD value of the simulated wastewater is greatly reduced when treated for 18h, wherein the COD degradation rate is 95.1%, which can effectively treat the precursor chemical wastewater. COD degradation rate (%) = (COD0-CODt) / COD0·100, wherein COD0 is the initial COD concentration of the acetaminophen solution, and CODt is the COD concentration of the acetaminophen solution after being treated for t time. Specific embodiment 2:

[0061] Different from the specific embodiment 1, the present scheme uses 2-(methylamino)benzoic acid wastewater, and the optimal combination is obtained after multiple tests. Figure 7 As shown, the optimal flow rate is still 0.6 mL / s, the optimal voltage is 30 V, the optimal current is 1 A, the optimal electrolysis time is 14 h, and the optimal concentration is 100 mg / L.

[0062] The degradation rate of COD after 14h treatment is 95.5%, which can effectively treat the chemical wastewater. Specific embodiment 3

[0064] Different from the specific examples 1 and 2, the wastewater used in this example is methyl anthranilate. Figure 7 As shown, the optimal flow rate is still 0.6mL / s, the optimal voltage is 30V, the optimal current is 1A, the optimal electrolysis time is 10h, and the optimal concentration is 100mg / L

[0065] As attached Figure 3 As shown, 10 hours of treatment is the best time, at which the COD value of the simulated wastewater is greatly reduced, and the COD degradation rate is 60%.

[0066] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims.

Claims

1. A trickle bed wastewater degradation device, comprising an electrolytic cell body (100) and a cell cover (200) arranged on the upper part of the electrolytic cell body (100), characterized in that: At least one electrolysis chamber (101) and a water storage chamber (102) are provided in the electrolysis cell body (100), and wastewater treated in the electrolysis chamber (101) overflows into the water storage chamber (102) when the wastewater is full; the cell cover (200) comprises a cell cover cavity (201), a first electrode mounting hole group (202) is provided in the cell cover cavity (201), cathode electrodes (203) and anode electrodes (204) are alternately provided in the first electrode mounting hole group (202), and the cathode electrodes (203) and anode electrodes (204) are both extended into the electrolysis chamber (201) through the electrode mounting holes (202); a drip hole (205) is also provided at the mounting hole of the anode electrode (204), and the drip hole (205) is used to guide the wastewater to be degraded to the anode electrode (204).

2. The trickle bed wastewater degradation device according to claim 1, characterized in that: It also includes a circulating water pump (103), wherein the water inlet end of the circulating water pump (103) is connected to the bottom of the water storage chamber (102) through a pipeline, and the water outlet end of the circulating water pump (103) is connected to the tank cover cavity (201) through a pipeline.

3. The trickle bed wastewater degradation device according to claim 2, characterized in that: A cover plate (206) is provided on the upper part of the tank cover cavity (201), and a pipe installation hole (207) is provided on the cover plate (206). A pipe connected to the water outlet of the circulating water pump (103) extends into the tank cover cavity (201) through the pipe installation hole (207).

4. The trickle bed wastewater degradation device according to claim 1, characterized in that: A water baffle (208) is also provided in the tank cover cavity (201), and there are a plurality of water baffles (208). The water baffles (208) are arranged around the first electrode mounting hole group (202).

5. The trickle bed wastewater degradation device according to claim 1, characterized in that: The electrolytic cell body (101) includes two groups of side plates (108) arranged opposite to each other, and a first partition plate (104) and a second partition plate (105) are arranged between any group of side plates (108) arranged opposite to each other; the electrolytic chamber (101) includes a first electrolytic chamber (106) and a second electrolytic chamber (107), the first electrolytic chamber (106) is formed by connecting the first partition plate and the side plate (108), and the second electrolytic chamber (107) is formed by connecting the first partition plate (104), the second partition plate (105) and the side plate (108) respectively, wherein the upper end height of the second partition plate (105) is lower than that of the first partition plate (104).

6. The trickle bed wastewater degradation device according to claim 5, characterized in that: The tank cover (200) is also provided with a second electrode mounting hole group (209); the first electrode mounting hole group (202) corresponds to the first electrolytic chamber (106), and the second electrode mounting hole group (202) corresponds to the second electrolytic chamber (107); a water retaining plate (208) is also provided around the outer side of each electrode mounting hole of the second electrode mounting hole group (209); the cathode electrodes (203) and the anode electrodes (204) alternately provided in the second electrode mounting hole group (209) extend into the second electrolytic chamber (107).

7. The trickle bed wastewater degradation device according to claim 1, characterized in that: The first electrode installation hole group (202) has a plurality of drip holes (205) on the anode electrode (204), and a guide groove (211) is provided in the bottom plate (210) of the tank cover (200). The guide groove (211) is located directly below the drip holes (205) and is used to guide wastewater to the anode electrode (204).

8. The trickle bed wastewater degradation device according to claim 1, characterized in that: An overflow tube (212) is also provided on the tank cover (200), and an overflow channel in the overflow tube (212) is communicated with the water storage chamber (102).

9. A trickle bed wastewater degradation method, characterized in that: The trickle bed wastewater degradation device according to claims 1 to 8 is used to degrade wastewater, comprising the following steps: S1, assembling the wastewater degradation device, wherein the spacing between the cathode electrode (203) and the anode electrode (204) in each group of electrode mounting holes is set to 1-3 cm; and configuring the supply current and supply voltage of the electrodes, wherein the DC current passed is 0.02-2A, and the DC voltage is 10V-30V; S2, introducing a sufficient amount of wastewater to be degraded into the electrolytic cell cover cavity (201), wherein the liquid level of the wastewater to be degraded is lower than the height of the overflow tube (212); S3, the introduced wastewater to be degraded will enter the guide groove (211) from the drip hole (205) under the action of water pressure and gravity, and under the action of the guide groove (211) and the drip hole (205), the wastewater to be degraded will flow into the electrolysis chamber (101) along the anode electrode in the form of a thin film liquid for electrolytic degradation; S4. When the wastewater treated in the electrolysis chamber (101) exceeds the height of the electrolysis chamber (101), it will overflow into the water storage chamber (102). When the wastewater in the water storage chamber (102) reaches a set value, the treated wastewater is circulated multiple times by a circulating water pump and passed into the tank cover cavity (201).

10. The trickle bed wastewater degradation method according to claim 9, characterized in that: In step S2, the introduced wastewater to be degraded is a chemical derivative that is electrically neutral or has cationic groups in an aqueous solution, and the chemical derivative includes acetaminophen, 2-(methylamino)benzoic acid, and methyl anthranilate.

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