A sewage pretreatment system

Abstract

The utility model discloses a sewage pretreatment system, including water intake system, hydrogen peroxide dosing system, electrocatalysis treatment system and reflux system, the water intake system is including wastewater collection jar and booster pump, hydrogen peroxide dosing system is including hydrogen peroxide dosing pump, hydrogen peroxide storage jar and wastewater mixing box, the electrocatalysis system is including external power supply and electrocatalysis oxidation reactor, the reflux system is including gas -liquid mixer, ozone generator and reflux pump, through electrocatalysis oxidation, ozone oxidation and hydrogen peroxide oxidation multistage synergic treatment, wastewater can be efficiently handled in this system, and the pollutant in wastewater and biological toxicity are effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of wastewater pretreatment technology, and in particular to a wastewater pretreatment system. Background Technology

[0002] With the rapid development of industrialization, the scale of industries such as chemical, pharmaceutical, textile printing and dyeing, coking, and electroplating has expanded rapidly, and the amount of wastewater has increased significantly. This type of wastewater has the following significant characteristics: (1) Complex composition and high toxicity: It contains recalcitrant organic matter (such as benzene series, heterocyclic compounds, polycyclic aromatic hydrocarbons), heavy metals (such as lead, mercury, chromium), high concentration of salt, ammonia nitrogen, etc. These pollutants are often biotoxic, can inhibit microbial activity, and some have "three-way" effects (carcinogenic, teratogenic, and mutagenic), posing a high environmental risk. (2) Poor biodegradability: Its BOD / COD ratio is usually less than 0.3, which means that microorganisms have difficulty in natural degradation. (3) Large fluctuations in water quality and quantity: Intermittent industrial production leads to unstable water quality and quantity of wastewater discharge, which has a strong impact on the treatment system. If the above characteristics are not properly treated, they will cause serious damage to the aquatic ecosystem and threaten human health through bioaccumulation. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a high-efficiency wastewater pretreatment system that addresses the shortcomings of existing technologies. This system achieves efficient treatment of toxic, harmful, and recalcitrant wastewater by setting up a hydrogen peroxide dosing system, an electrocatalytic treatment system, and a reflux system including an ozone generator.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A wastewater pretreatment system includes an influent system, a hydrogen peroxide dosing system, an electrocatalytic treatment system, and a reflux system; the influent system includes a wastewater collection tank and a booster pump; the hydrogen peroxide dosing system includes a hydrogen peroxide dosing pump, a hydrogen peroxide storage tank, and a wastewater mixing tank; the electrocatalytic system includes an external power supply and an electrocatalytic oxidation reactor; and the reflux system includes a gas-liquid mixer, an ozone generator, and a reflux pump.

[0005] Preferably, the wastewater mixing tank is provided with an inlet 1, an inlet 2, an inlet 3, and an outlet.

[0006] Furthermore, the wastewater collection tank has an inlet at the top and an outlet at the bottom; the outlet is connected to the inlet of the wastewater mixing tank via a pipe. The booster pump is installed on the pipe connecting the outlet of the wastewater collection tank and the inlet of the wastewater mixing tank.

[0007] Furthermore, the hydrogen peroxide dosing pump is connected to the inlet of the wastewater mixing tank; the outlet of the gas-liquid mixer is connected to the inlet of the wastewater mixing tank.

[0008] Furthermore, the electrocatalytic oxidation reactor has a reactor inlet at its front end and a reactor outlet and a reflux outlet at its rear end; the outlet of the wastewater mixing tank is connected to the inlet of the electrocatalytic oxidation reactor. A drainage pipe is connected to the outlet of the electrocatalytic oxidation reactor; the reflux outlet of the electrocatalytic oxidation reactor is connected to the inlet of the reflux pump, and the outlet of the reflux pump is connected to the inlet of the gas-liquid mixer.

[0009] Preferably, the ozone generator is connected to the air inlet of the gas-liquid mixer via an ozone delivery pipeline.

[0010] Preferably, the electrocatalytic oxidation reactor includes a housing and positive and negative electrode plates disposed within the housing. Both the positive and negative electrode plates are connected to an external power source.

[0011] Compared with the prior art, this utility model has the following advantages: First, the wastewater pretreatment system of this utility model integrates ozone oxidation into the electrocatalytic oxidation system, which significantly improves the treatment efficiency compared to the electrocatalytic oxidation process.

[0012] Secondly, the wastewater pretreatment system of this utility model adds a hydrogen peroxide dosing device to the reflux of the electrocatalytic oxidation system. In the electrocatalytic oxidation reaction tank, hydrogen peroxide can form ·OH through electrolysis, which greatly increases the system's treatment capacity.

[0013] Third, the wastewater pretreatment system of this utility model utilizes a gas-liquid mixer to fully mix ozone with the reflux liquid, increasing the utilization rate of ozone and improving treatment efficiency; the reflux liquid containing ozone is mixed with hydrogen peroxide in a mixing tank to construct a hydrogen peroxide-ozone (H2O2 / O3) advanced oxidation system, which can effectively decompose substances that are difficult to degrade and cannot be treated by electrocatalytic oxidation systems.

[0014] Fourth, the wastewater pretreatment system of this utility model couples multiple advanced oxidation technologies, which greatly improves the treatment efficiency and effect of difficult-to-treat wastewater. Attached Figure Description

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, and the advantages of the present invention in the above and / or other aspects will become clearer.

[0016] Figure 1 This is a schematic diagram of the wastewater pretreatment system of this utility model.

[0017] The reference numerals in the attached figures represent: 1. Inlet; 2. Wastewater collection tank; 3. Booster pump; 4. Hydrogen peroxide dosing pump; 5. Hydrogen peroxide storage tank; 6. Gas-liquid mixer; 7. Ozone generator; 8. Wastewater mixing tank; 9. Inlet of electrocatalytic oxidation reactor; 10. Positive and negative electrode plates; 11. Reflux pump; 12. External power supply; 13. Electrocatalytic oxidation reactor; 14. Drainage pipe; 15. Ozone delivery pipe. Detailed Implementation

[0018] The present invention will be further described below with reference to the following embodiments. It should be understood that the following embodiments are only for illustrating the present invention and are not intended to limit the present invention.

[0019] The structures, proportions, and sizes shown in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, terms such as "upper," "lower," "front," "rear," and "middle" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0020] Reference Figure 1 , Figure 1 A schematic diagram of a wastewater pretreatment system according to an embodiment of the present invention is shown. The wastewater pretreatment system provided in this embodiment includes an influent system, a hydrogen peroxide dosing system, an electrocatalytic treatment system, and a reflux system. The influent system includes a wastewater collection tank 2 and a booster pump 3. The hydrogen peroxide dosing system includes a hydrogen peroxide dosing pump 4, a hydrogen peroxide storage tank 5, and a wastewater mixing tank 8. The electrocatalytic system includes an external power supply 12 and an electrocatalytic oxidation reactor 13. The reflux system includes a gas-liquid mixer 6, an ozone generator 7, and a reflux pump 11. The wastewater is industrial wastewater from industries such as chemical, pharmaceutical, textile printing and dyeing, coking, and electroplating.

[0021] In one embodiment, the wastewater mixing tank 8 is provided with an inlet 1, an inlet 2, an inlet 3 and an outlet.

[0022] Furthermore, the wastewater collection tank 2 is provided with an inlet 1 at the top and an outlet at the bottom; the outlet is connected to the inlet of the wastewater mixing tank 8 through a pipe; the booster pump 3 is installed on the pipe connecting the outlet of the wastewater collection tank and the inlet of the wastewater mixing tank 8.

[0023] Furthermore, the hydrogen peroxide dosing pump 4 is connected to the inlet of the wastewater mixing tank 8; the outlet of the gas-liquid mixer 6 is connected to the inlet of the wastewater mixing tank 8.

[0024] Furthermore, the electrocatalytic oxidation reactor 13 is provided with a reactor inlet at its front end and a reactor outlet and a reflux outlet at its rear end; the outlet of the wastewater mixing tank 8 is connected to the inlet of the electrocatalytic oxidation reactor 13. The outlet of the electrocatalytic oxidation reactor 13 is connected to a drainage pipe 14; the reflux outlet of the electrocatalytic oxidation reactor 13 is connected to the inlet of the reflux pump 11, and the outlet of the reflux pump 11 is connected to the inlet of the gas-liquid mixer 6.

[0025] In one embodiment, the ozone generator 7 is connected to the air inlet of the gas-liquid mixer 6 via an ozone delivery pipe 15.

[0026] In one embodiment, the electrocatalytic oxidation reactor 13 includes a housing and positive and negative electrode plates 10 disposed within the housing, both of which are connected to an external power supply 12.

[0027] The inlet 1 of the wastewater collection tank 2 is connected to the sewage discharge pipe of the production wastewater, and the outlet of the wastewater collection tank 2 is connected to the inlet 1 of the wastewater mixing tank 8 through a pipe. A booster pump 3 is installed on the pipe to control the inlet flow rate, and the sewage is pumped into the wastewater mixing tank 8 through the booster pump 3. The hydrogen peroxide dosing pump 4 delivers hydrogen peroxide from the hydrogen peroxide storage tank 5 to the wastewater mixing tank 8. The outlet of the wastewater mixing tank 8 is connected to the inlet 9 of the electrocatalytic oxidation reactor 13. The electrocatalytic oxidation reactor 13 is equipped with a drainage pipe 14 and a reflux system. The electrocatalytic oxidation reactor 13 is equipped with positive and negative electrode plates 10 and an external power supply 12. The reflux system includes a reflux pipe and a reflux pump 11 installed on the reflux pipe. One end of the reflux pipe is connected to the reflux port at the lower end of the electrocatalytic oxidation reactor 13, and the other end is connected to the inlet of the gas-liquid mixer 6. After the wastewater is treated by the electrocatalytic oxidation reactor 13, part of the water (compliant water) is discharged in compliance with standards, and the other part of the water (reflux water) is returned to the gas-liquid mixer 6 through the reflux pipe. The gas-liquid mixer 6 is connected to the ozone generator 7 through the ozone delivery pipe 15.

[0028] The electrocatalytic oxidation reactor 13 includes a housing and an electrode device located inside the housing. The electrode device includes positive and negative electrode plates 10 and an external power supply 12.

[0029] The wastewater pretreatment system operates as follows: Under continuous influent conditions, wastewater flows into wastewater collection tank 2 through a discharge pipe. The wastewater stored in collection tank 2 is then pumped into wastewater mixing tank 8 by a booster pump 3, which controls the influent flow rate. The wastewater in the mixing tank mainly consists of influent, hydrogen peroxide, and ozone-containing return water. Ozone and return water are thoroughly mixed in a gas-liquid mixer before entering the mixing tank. The main functions of the mixing tank are dilution, thoroughly mixing the return water and influent to reduce the concentration entering the reactor, and mixing hydrogen peroxide and ozone with the wastewater to enhance the treatment efficiency of the electrocatalytic oxidation reactor. After thorough mixing in the mixing tank, the wastewater enters the electrocatalytic oxidation reactor for efficient treatment. A portion of the treated wastewater is returned to the front end to mix and react again with ozone and hydrogen peroxide, further increasing treatment efficiency. Most of the treated wastewater is discharged from the system after meeting treatment standards. Specifically, the reflux system returns a portion of the wastewater already treated by the electrocatalytic oxidation reactor 13 to the gas-liquid mixer 6. Ozone is introduced into the gas-liquid mixer 6 via the ozone generator 7. At this point, the wastewater, reflux liquid, and ozone are mixed in the gas-liquid mixer 6. The ozone further treats the pollutants in the reflux liquid that were not removed by the electrocatalytic oxidation, and then the mixture enters the wastewater mixing tank 8. Simultaneously, the wastewater mixing tank is connected to a hydrogen peroxide dosing system. Hydrogen peroxide from the hydrogen peroxide storage tank 5 is pumped to the wastewater mixing tank 8 via the hydrogen peroxide dosing pump 4. Combined with the ozone in the reflux liquid, a hydrogen peroxide-ozone (H2O2 / O3) advanced oxidation system is formed, which can pre-treat the influent and reflux liquid in the wastewater mixing tank, reducing the pollutant content. The treated wastewater still contains ozone and hydrogen peroxide and enters the electrocatalytic oxidation reactor 13 for efficient treatment. Under the action of the electrodes in the electrocatalytic oxidation reactor 13, water, hydrogen peroxide and ozone can all form ·OH free radicals, which can effectively treat various pollutants in wastewater, and the treated wastewater can meet the design discharge standards.

[0030] This utility model provides a concept and method for a wastewater pretreatment system. Many methods and approaches exist for implementing this technical solution; the above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. All components not explicitly stated in this embodiment can be implemented using existing technology.

Claims

1. A wastewater pretreatment system, characterized in that, This includes an inlet system, a hydrogen peroxide dosing system, an electrocatalytic treatment system, and a reflux system; The water inlet system includes a wastewater collection tank (2) and a booster pump (3); The hydrogen peroxide dosing system includes a hydrogen peroxide dosing pump (4), a hydrogen peroxide storage tank (5), and a wastewater mixing tank (8). The electrocatalytic treatment system includes an external power source (12) and an electrocatalytic oxidation reactor (13). The reflux system includes a gas-liquid mixer (6), an ozone generator (7), and a reflux pump (11).

2. The wastewater pretreatment system according to claim 1, characterized in that, The wastewater mixing tank (8) is equipped with inlet 1, inlet 2, inlet 3 and outlet.

3. The wastewater pretreatment system according to claim 2, characterized in that, The wastewater collection tank (2) is provided with an inlet (1) at the top and an outlet at the bottom; the outlet is connected to the inlet of the wastewater mixing tank (8) through a pipe.

4. The wastewater pretreatment system according to claim 3, characterized in that, The booster pump (3) is installed on the pipeline between the outlet of the wastewater collection tank and the inlet of the wastewater mixing tank (8).

5. The wastewater pretreatment system according to claim 2, characterized in that, The hydrogen peroxide dosing pump (4) is connected to the inlet of the wastewater mixing tank (8) in two ways; the outlet of the gas-liquid mixer (6) is connected to the inlet of the wastewater mixing tank (8) in three ways.

6. The wastewater pretreatment system according to claim 2, characterized in that, The electrocatalytic oxidation reactor (13) is provided with a reactor inlet at the front end and a reactor outlet and a reflux outlet at the rear end; the outlet of the wastewater mixing tank (8) is connected to the inlet of the electrocatalytic oxidation reactor (13).

7. The wastewater pretreatment system according to claim 6, characterized in that, The outlet of the electrocatalytic oxidation reactor (13) is connected to a drainage pipe (14); the reflux port of the electrocatalytic oxidation reactor (13) is connected to the inlet of the reflux pump (11), and the outlet of the reflux pump (11) is connected to the inlet of the gas-liquid mixer (6).

8. The wastewater pretreatment system according to claim 1, characterized in that, The ozone generator (7) is connected to the air inlet of the gas-liquid mixer (6) through an ozone delivery pipe (15).

9. The wastewater pretreatment system according to claim 1, characterized in that, The electrocatalytic oxidation reactor (13) includes a housing and positive and negative electrode plates disposed within the housing.

10. The wastewater pretreatment system according to claim 9, characterized in that, Both the positive electrode plate and the negative electrode plate are connected to an external power supply (12).

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