Two-phase catalytic oxidation sewage treatment process and reaction device

Abstract

The application discloses a two-phase catalytic oxidation wastewater treatment process and a reaction device, and particularly relates to the field of wastewater treatment. The wastewater is pumped from a sewage pipe into a reaction tower body under the operation of a sewage pump, and is degraded and treated under the cooperation of catalysts in first and second catalytic filter cartridges. The used catalysts are moved into a feeding cartridge for replacement by the cooperation of a material replacement mechanism connected to the two ends of the first and second catalytic filter cartridges, and the catalytic reaction is continuously carried out, so that the efficiency of wastewater treatment is ensured. The used catalysts in the feeding cartridge are cleaned by a cleaning assembly, so as to be reused. In the whole process, no acidic reagent needs to be added, so that the reagent addition cost is reduced, the catalysts can be automatically replaced, the automation level is improved, the replaced catalysts can be automatically cleaned, so that the catalysts can be reused, and the cost of wastewater treatment is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the sewage treatment technical field, more particularly, the present application relates to a two-phase catalytic oxidation sewage treatment process and reaction device. BACKGROUND

[0002] Organic wastewater sources are quite extensive, and the wastewater discharged by the printing and dyeing industry, pharmaceutical industry and the like is mostly high-concentration organic wastewater, which can cause a series of water pollution and threaten human health, and in particular, high-concentration and hard-to-degrade organic wastewater has great harm to the environment. The organic matter contained in such wastewater has a high concentration, and the COD is generally above 2000 mg / L, and some even reaches tens of thousands of mg / L or even hundreds of thousands of mg / L. Relatively speaking, the BOD is low, and the ratio of BOD to COD in many wastewaters is less than 0.3. In addition, the composition of such wastewater is complex, and often contains aromatic compounds and heterocyclic compounds, and also contains sulfides, nitrides, heavy metals and toxic organic matter, which are difficult to be directly biologically treated.

[0003] The utility model patent with patent application publication number CN214218293U discloses a three-phase catalytic oxidation sewage treatment device, which comprises a catalytic oxidation tower, a grid plate is fixed in the catalytic oxidation tower, a gravel layer and a solid catalyst layer are sequentially laid on the grid plate from bottom to top, an aeration pipe is arranged below the grid plate in the catalytic oxidation tower, the aeration pipe penetrates through the catalytic oxidation tower and is connected with a blowing device, a water inlet is formed in the upper part of one side of the catalytic oxidation tower and is connected with a sewage inlet pipe, a mixer is installed outside the catalytic oxidation tower and connected with the sewage inlet pipe, the mixer is connected with a hydrogen peroxide pipe, and a water outlet is formed in the lower part of the other side of the catalytic oxidation tower and is connected with a water outlet pipe. The utility model can decompose the organic matter in wastewater, thereby greatly reducing the COD value in wastewater, basically fading the color, improving the BOD / COD ratio, reducing the toxicity of wastewater, and improving the biodegradability of wastewater, thereby creating conditions for subsequent biological treatment. Compared with the Fenton catalytic oxidation process, the utility model has the advantages of advancement and simpler operation.

[0004] However, the device needs to add a large amount of medicament during actual use, thereby increasing the cost of sewage treatment. In addition, the device needs to be stopped for cleaning the catalyst during the cleaning process of the catalyst, thereby stopping the sewage treatment and reducing the sewage treatment efficiency. Therefore, the present application provides a two-phase catalytic oxidation sewage treatment process and reaction device. SUMMARY

[0005] In order to overcome the above-mentioned defects of the prior art, the present application provides a two-phase catalytic oxidation sewage treatment process and reaction device to solve the problems in the above background.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a two-phase catalytic oxidation sewage treatment process, comprising the following steps:

[0007] S1: placing a composite heterogeneous transition metal catalyst and a solid zero-valent composite metal catalyst in a reaction tower for catalytic reaction on the incoming sewage;

[0008] S2: introducing sewage into the reaction tower and aerating the bottom of the reaction tower;

[0009] S3: while the sewage is being introduced, hydrogen peroxide is injected into the sewage in the reaction tower at normal temperature and pressure, and the sewage is treated under the reaction of the two catalysts;

[0010] S4: during the sewage treatment process, when the effect of the catalysts is not good after use, the catalysts can be automatically replaced to ensure the efficiency of the sewage treatment, and the replaced catalysts can be cleaned and recycled for reuse.

[0011] Preferably, when the sewage is introduced into the reaction tower, hydrogen peroxide is simultaneously introduced into the reaction tower, and the mixed liquid at the bottom of the reaction tower is continuously aerated.

[0012] Preferably, the composite heterogeneous transition metal catalyst and the solid zero-valent composite metal catalyst are provided in two portions respectively, and each two portions are used alternately.

[0013] By taking two portions of the composite heterogeneous transition metal catalyst and the solid zero-valent composite metal catalyst respectively and placing them in the corresponding feeding cylinders between the first and second stop discs in each feeding cylinder, when sewage treatment is performed, the catalysts in the two feeding cylinders on the same side are respectively pushed into the first and second catalytic filter cartridges under the action of the corresponding material replacement mechanisms, the sewage pump operates to pump and deliver water from the sewage pipe into the reaction tower body aerated by the air blower, and the hydrogen peroxide pipe delivers hydrogen peroxide, so that the organic components in the sewage are degraded and treated under the catalysis of the two catalysts.

[0014] Preferably, a reaction device for a two-phase catalytic oxidation sewage treatment process includes a reaction tower body, a sewage pump connected to the bottom end of one side of the reaction tower body, a sewage pipe connected to the sewage pump, a hydrogen peroxide pipe connected to the bottom end of the reaction tower body, an air blower arranged at the bottom end of one side of the reaction tower body, a cleaning assembly connected to the bottom end of one side of the reaction tower body, a first catalytic filter cartridge and a second catalytic filter cartridge installed in parallel inside the reaction tower body, a feeding cylinder welded to the reaction tower body on both sides of the first and second catalytic filter cartridges, a material replacement mechanism installed in each feeding cylinder, and a water outlet pipe connected to the top end of one side of the reaction tower body.

[0015] By sewage pump under the operation of sewage from the sewage pipe to the reaction tower body, synchronous operation of the air blower, the pipe to the reaction tower body to the hydrogen peroxide, in the first catalytic filter cartridge and the second catalytic filter cartridge in the catalyst of the cooperation of sewage degradation treatment, on the surface of the catalyst covered by the dirt, resulting in the contact surface of the sewage, resulting in the catalytic efficiency is low, by the first catalytic filter cartridge and the second catalytic filter cartridge two end connection cooperation of the material replacement mechanism cooperation operation, the used catalyst moves to the loading cylinder, another group of unused catalyst from another loading cylinder to the corresponding filter, continuous catalytic reaction, so as to guarantee the efficiency of sewage treatment, through the cleaning assembly to the used catalyst in the loading cylinder, in order to reuse, in the whole process, no need to add acid reagent, so as to reduce the cost of reagent, can automatically replace the catalyst, improve the automation level, and the replaced catalyst can be automatically cleaned, so as to be reused, thereby reducing the cost of sewage treatment.

[0016] Preferably, the air blower is connected with a vent pipe, the vent pipe is inserted into the bottom end of the reaction tower body, and a plurality of aeration heads are installed on the vent pipe.

[0017] Preferably, the loading cylinder is connected with a cleaning pipe, the cleaning pipe is connected with the cleaning assembly, the bottom end of the loading cylinder is connected with a drainage pipe, the drainage pipe is connected with a backflow pipe, the backflow pipe is connected with the sewage pump, and the cleaning pipe and the drainage pipe are both installed with valves.

[0018] Preferably, the material replacement mechanism comprises a hydraulic pump, and the hydraulic pump is installed at one end of the loading cylinder.

[0019] The hydraulic rod is connected with the hydraulic pump at one end.

[0020] The first plug disc is installed at the other end of the hydraulic rod.

[0021] The connecting rod is connected with the first plug disc at one end.

[0022] The second plug disc is installed at the other end of the connecting rod.

[0023] When the catalyst is replaced, the hydraulic pump is operated to extend the hydraulic rod, so that the first plug disc and the second plug disc connected with the connecting rod are moved into the corresponding filter synchronously, and in the moving process, the catalyst in the first plug disc and the second plug disc is pushed into the corresponding filter, and when another group of material replacement mechanisms operates synchronously, the hydraulic rod is retracted to drag the used catalyst back to another loading cylinder, so as to realize automatic replacement of the catalyst and guarantee continuous catalysis without shutdown, thereby improving the efficiency of sewage treatment and the automation level of the reaction device.

[0024] Preferably, the first and second stop discs are in sliding fit with the feeding cylinder, and a catalyst is arranged between the first and second stop discs.

[0025] Preferably, the cleaning assembly comprises a clean water pump, which is arranged at one side of the reaction tower body.

[0026] The clean water pipe is connected with the water pumping end of the clean water pump.

[0027] The water inlet pipe is connected with the water inlet end at one end and connected with the cleaning pipe at the other end.

[0028] Technical effects and advantages of the present application:

[0029] Compared with the prior art, the composite heterogeneous transition metal catalyst and the solid zero-valent composite metal catalyst are used as the catalyst, the efficient catalytic oxidation secondary reaction of industrial wastewater treatment is realized, the required PH adaptive condition of the reaction is wider, and no acid needs to be added, so that the use of alkali is reduced, and the operation cost and the operation danger are greatly reduced.

[0030] Compared with the prior art, the catalyst in the catalytic filter cartridge can be automatically replaced by the material replacement mechanism in the feeding cylinder, so that the surface of the catalyst is not covered, the catalytic efficiency of the catalyst is ensured, the sewage treatment efficiency is improved, and the catalyst can be automatically replaced, so that the automation level is improved.

[0031] Compared with the prior art, the recovered catalyst can be washed, so that the catalyst can be repeatedly used, the sewage after cleaning can be automatically discharged into the reactor, waste is avoided, automatic treatment can be performed, and the automation level is improved. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0033] Figure 2 It is a schematic diagram of the rear perspective structure of the present application.

[0034] Figure 3 It is a schematic diagram of the cooperation structure of the first and second catalytic filter cartridges of the present application.

[0035] Figure 4 It is a schematic diagram of the material replacement mechanism of the present application.

[0036] The reference signs are: 1, reaction tower body; 2, sewage pump; 3, sewage pipe; 4, backflow pipe; 5, feeding cylinder; 6, material replacing mechanism; 601, hydraulic pump; 602, hydraulic rod; 603, first plug disc; 604, connecting rod; 605, second plug disc; 7, air blower; 8, hydrogen peroxide pipe; 9, cleaning assembly; 901, clean water pump; 902, clean water pipe; 903, water inlet pipe; 10, water outlet pipe; 11, first catalytic filter cylinder; 12, second catalytic filter cylinder. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] A two-phase catalytic oxidation sewage treatment process, comprising the following steps:

[0039] S1: placing composite heterogeneous transition metal catalyst and solid zero-valent composite metal catalyst in the reaction tower for catalytic reaction on the incoming sewage;

[0040] S2: introducing sewage into the reaction tower and aerating the bottom of the reaction tower;

[0041] S3: while introducing sewage, hydrogen peroxide is injected into the sewage in the reaction tower at normal temperature and pressure, and the sewage is treated under the reaction of the two catalysts;

[0042] S4: during the sewage treatment process, when the effect of the catalyst after use is poor, the catalyst can be automatically replaced to ensure the sewage treatment efficiency, and the replaced catalyst can be cleaned and recycled for reuse.

[0043] When sewage is introduced into the reaction tower, hydrogen peroxide is introduced into the reaction tower at the same time, and the bottom end of the mixed liquid in the reaction tower is continuously aerated.

[0044] The composite heterogeneous transition metal catalyst and the solid zero-valent composite metal catalyst are respectively provided with two parts, and each two parts are used alternately.

[0045] By taking two copies of the composite heterogeneous transition metal catalyst and solid zero-valent composite metal catalyst respectively, and placing them in the corresponding feeding cylinder 5 between the first and second stop discs 603 and 605 in each feeding cylinder 5, when sewage treatment is performed, the catalysts in the two feeding cylinders 5 on the same side are respectively pushed into the first and second catalytic filter cartridges 11 and 12 under the action of the corresponding material changing mechanism 6, the sewage pump 2 operates to pump water from the sewage pipe 3 into the reaction tower body 1 aerated by the air blower 7, and the hydrogen peroxide pipe 8 delivers hydrogen peroxide, and under the catalysis of the two groups of catalysts respectively, the organic components in the sewage are degraded and treated.

[0046] As shown in the accompanying drawings Figures 1-4 , a two-phase catalytic oxidation sewage treatment process reaction device, comprising a reaction tower body 1, one side of the reaction tower body 1 is connected with a sewage pump 2, the sewage pump 2 is connected with a sewage pipe 3, the bottom end of the reaction tower body 1 is connected with a hydrogen peroxide pipe 8, one side of the bottom end of the reaction tower body 1 is provided with an air blower 7, one side of the bottom end of the reaction tower body 1 is connected with a cleaning assembly 9, the first and second catalytic filter cartridges 11 and 12 are installed in parallel inside the reaction tower body 1, the reaction tower body 1 on both sides of the first and second catalytic filter cartridges 11 and 12 is welded with a feeding cylinder 5, the feeding cylinder 5 is installed with a material changing mechanism 6, one side of the top end of the reaction tower body 1 is connected with a water outlet pipe 10, one end of the air blower 7 is connected with an air pipe, the air pipe is inserted into the bottom end of the reaction tower body 1, and a plurality of aeration heads are installed on the air pipe.

[0047] As shown in the accompanying drawings Figure 2 , one side of the feeding cylinder 5 is connected with a cleaning pipe, the cleaning pipe is connected with the cleaning assembly 9, the bottom end of the feeding cylinder 5 is connected with a drainage pipe, the drainage pipe is connected with a return pipe 4, the return pipe 4 is connected with the sewage pump 2, the cleaning pipe and the drainage pipe are both installed with valves, clean water is delivered from the cleaning pipe into the feeding cylinder 5 through the cleaning assembly 9 to flush the catalyst in the feeding cylinder 5, the flushed sewage is discharged again through the return pipe 4, and the sewage pump 2 is operated to automatically pump into the reaction tower for treatment, avoiding water waste and pollution to the surrounding environment.

[0048] As shown in the accompanying drawings Figure 3 and Figure 4 , the material changing mechanism 6 comprises a hydraulic pump 601, and the hydraulic pump 601 is installed at one end of the feeding cylinder 5.

[0049] A hydraulic rod 602, one end of the hydraulic rod 602 is connected with the hydraulic pump 601.

[0050] A first stop disc 603, the first stop disc 603 is installed at the other end of the hydraulic rod 602.

[0051] A connecting rod 604, one end of the connecting rod 604 is connected with the first stop disc 603.

[0052] The second plug disc 605 is installed at the other end of the connecting rod 604.

[0053] The first plug disc 603 and the second plug disc 605 are in sliding fit with the feeding cylinder 5, and catalysts are placed between the first plug disc 603 and the second plug disc 605.

[0054] When the catalysts are replaced, the hydraulic pump 601 is operated to make the hydraulic rod 602 extend, so that the first plug disc 603 and the second plug disc 605 connected by the connecting rod 604 are synchronously moved into the corresponding filter cylinder, and in the process of moving, the catalysts in the first plug disc 603 and the second plug disc 605 are pushed into the corresponding filter cylinder. When the other group of the catalyst replacement mechanism 6 is operated synchronously, the hydraulic rod 602 is retracted to pull the used catalysts back to the other feeding cylinder 5, so that the catalysts are automatically replaced, the continuous catalysis is ensured, and the sewage treatment efficiency is improved, and the automation level of the reaction device is improved.

[0055] As shown in the accompanying drawings, the cleaning assembly 9 comprises a clean water pump 901. Figure 2 The clean water pump 901 is arranged on one side of the reaction tower body 1.

[0056] The clean water pipe 902 is connected with the water pumping end of the clean water pump 901.

[0057] The water inlet pipe 903 is connected with the water inlet end at one end and connected with the cleaning pipe at the other end.

[0058] Through the operation of the clean water pump 901, water is pumped from the clean water pipe 902, discharged into the corresponding cleaning pipe through the water inlet pipe 903, and then enters the corresponding feeding cylinder 5 to clean the internal catalysts.

[0059] Through sewage pump 2 under the operation of sewage from the sewage pipe 3 to the reaction tower body 1, synchronous air blower 7 operation, hydrogen peroxide pipe 8 to the reaction tower body 1 delivery hydrogen peroxide, in the first catalytic filter cartridge 11 and the second catalytic filter cartridge 12 in the catalyst of the cooperation of sewage degradation treatment, covered by the dirt on the surface of the catalyst, resulting in the contact surface of sewage, thus resulting in the catalytic efficiency is low, through the first catalytic filter cartridge 11 and the second catalytic filter cartridge 12 both ends of the connection and cooperation of the material mechanism 6 cooperation operation, the used catalyst is moved to the loading cylinder 5, another group of unused catalyst from another loading cylinder 5 is transported to the corresponding filter, the catalytic reaction is continued, so as to guarantee the efficiency of sewage treatment, through the cleaning assembly 9 to the used catalyst in the loading cylinder 5 is cleaned, in order to be reused, in the whole process, the addition of acid reagent is not needed, so as to reduce the cost of reagent addition, can automatically replace the catalyst, improve the automation level, and the replaced catalyst can be automatically cleaned, so as to be reused, thus reducing the cost of sewage treatment.

Claims

1. A two-phase catalytic oxidation wastewater treatment process characterized by: The method comprises the following steps: S1: composite heterogeneous transition metal catalyst and solid zero-valent composite metal catalyst are respectively placed in the first catalytic filter cartridge (11) and the second catalytic filter cartridge (12) installed on the reaction tower body (1), and the two catalysts are configured in two copies and are used alternately; S2: sewage is transported from the sewage pipe (3) to the reaction tower body (1) by the sewage pump (2), and hydrogen peroxide is separately transported to the reaction tower body (1) by the hydrogen peroxide pipe (8), and the air blower (7) is started at the same time, and the tower is aerated by the air pipe and the aeration head at the bottom end of the reaction tower body (1); S3: under the condition of normal temperature and pressure without adding acidic reagents, the composite heterogeneous transition metal catalyst and the solid zero-valent composite metal catalyst are used to treat the sewage; S4: when the catalyst causes poor treatment effect after use, the catalyst is automatically replaced by the material changing mechanism (6): the material changing mechanism (6) comprises a hydraulic pump (601), a hydraulic rod (602), a first plug disc (603), a connecting rod (604) and a second plug disc (605), the hydraulic pump (601) is installed at one end of the feeding cylinder (5), one end of the hydraulic rod (602) is connected with the hydraulic pump (601), the first plug disc (603) is installed at the other end of the hydraulic rod (602), one end of the connecting rod (604) is connected with the first plug disc (603), the second plug disc (605) is installed at the other end of the connecting rod (604), the first plug disc (603) and the second plug disc (605) are in sliding fit with the feeding cylinder (5), and the catalyst is placed between the first plug disc (603) and the second plug disc (605); when the catalyst is replaced, the hydraulic pump (601) is operated to make the hydraulic rod (602) extend, so that the second plug disc (605) connected with the first plug disc (603) and the connecting rod (604) moves into the corresponding filter cartridge synchronously, and in the moving process, the catalyst in the first plug disc (603) and the second plug disc (605) is pushed into the corresponding filter cartridge, and when the other group of material changing mechanisms (6) operates synchronously, the hydraulic rod (602) retracts, and the used catalyst is dragged back to the other feeding cylinder (5), so that the catalyst is automatically replaced; S5: the catalyst in the feeding cylinder (5) is cleaned and recovered: the cleaning assembly (9) is started, the cleaning assembly (9) comprises a clean water pump (901), a clean water pipe (902) connected with the water pumping end of the clean water pump (901), and a water inlet pipe (903) connected with the water inlet end of the clean water pump (901), the water inlet pipe (903) is in communication with the cleaning pipe on one side of the feeding cylinder (5), and the clean water enters the feeding cylinder (5) through the cleaning pipe to flush the deactivated catalyst; the sewage after the flushing is discharged through the drainage pipe at the bottom end of the feeding cylinder (5) and enters the backflow pipe (4), and is transported to the inlet of the sewage pump (2) by the backflow pipe (4) and reenters the reaction tower body (1) for treatment, and the catalyst after cleaning recovers activity and is recycled.

2. The reaction device of the two-phase catalytic oxidation wastewater treatment process according to claim 1, characterized in that: The utility model provides a sewage treatment device, including the reaction tower body (1), one side bottom of reaction tower body (1) is connected with sewage pump (2), sewage pump (2) is connected with sewage pipe (3), the bottom of reaction tower body (1) is connected with hydrogen peroxide pipe (8), one side bottom of reaction tower body (1) is provided with air blower (7), the bottom of reaction tower body (1) one side is connected with cleaning assembly (9), the inside parallel installation of reaction tower body (1) has first catalytic filter cylinder (11) and second catalytic filter cylinder (12), the both sides of first catalytic filter cylinder (11) and second catalytic filter cylinder (12) are all welded with feeding cylinder (5) on reaction tower body (1), each feeding cylinder (5) is installed with the exchange mechanism (6) in, the top of reaction tower body (1) one side is connected with water outlet pipe (10).

3. The reaction apparatus of claim 2, wherein: One end of the air blower (7) is connected with an air pipe, which is inserted into the bottom of the reaction tower body (1), and a plurality of aeration heads are installed on the air pipe.

4. The reaction apparatus of claim 2, wherein: One side of the feeding cylinder (5) is connected with a cleaning pipe, which is connected with the cleaning assembly (9). The bottom of the feeding cylinder (5) is connected with a drainage pipe, which is connected with a return pipe (4). The return pipe (4) is connected with the sewage pump (2). Valves are installed on the cleaning pipe and the drainage pipe.

5. The reaction apparatus of claim 2, wherein: The exchange mechanism (6) includes a hydraulic pump (601) installed at one end of the feeding cylinder (5). A hydraulic rod (602) is connected with the hydraulic pump (601) at one end. A first plug disc (603) is installed at the other end of the hydraulic rod (602). A connecting rod (604) is connected with the first plug disc (603) at one end. A second plug disc (605) is installed at the other end of the connecting rod (604).

6. The reactor of claim 2, wherein: The first plug disc (603) and the second plug disc (605) are both in sliding fit with the feeding cylinder (5), and a catalyst is placed between the first plug disc (603) and the second plug disc (605).

7. The reactor of claim 2 wherein: The cleaning assembly (9) includes a clean water pump (901) arranged on one side of the reaction tower body (1). A clean water pipe (902) is connected with the water pumping end of the clean water pump (901). An inlet pipe (903) is connected with the water inlet end at one end and the cleaning pipe at the other end.

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