In-situ hydrogen peroxide generator for sludge advanced dewatering pretreatment

Abstract

The utility model discloses a kind of sludge deep dewatering pretreatment in-situ hydrogen peroxide generator, including sludge pretreatment pool, the side of sludge pretreatment pool is provided with hydrogen peroxide generator, the liquid outlet end of hydrogen peroxide generator is installed with hydrogen peroxide temporary storage tank, the liquid outlet end of hydrogen peroxide temporary storage tank is connected with reagent conveying pipe by conveying pump, reagent conveying pipe is located in the upper portion of sludge pretreatment pool, and reagent conveying pipe is equipped with the outlet of medicine mouth of equidistance array on being set up.The beneficial effects of the utility model are: by setting hydrogen peroxide generator, hydrogen peroxide can be produced according to actual use demand, effectively avoid the harm generated by the storage of hydrogen peroxide on site, setting reagent conveying pipe is equipped with the outlet of medicine mouth of equidistance array on being set up can be evenly distributed to sludge pretreatment pool inside hydrogen peroxide, guarantee the uniformity of hydrogen peroxide dosing.

Description

Technical Field

[0001] This utility model relates to the field of sludge treatment technology, and in particular to an in-situ hydrogen peroxide generator for deep dewatering pretreatment of sludge. Background Technology

[0002] Vertical sludge deep pressure filter dewatering equipment is a type of mechanical dewatering equipment that has gradually emerged in recent years. Compared with common sludge dewatering machines, it has the advantages of simple system, larger single processing capacity, lower operating cost, and high-pressure mechanical vertical extrusion of sludge. Under the conditions of proper selection and dosage of equipment and precise control, the moisture content of the influent sludge is about 80%, and the average moisture content of the effluent sludge can reach 50%-55%. In the pretreatment of sludge deep dewatering, hydrogen peroxide is often used to improve the dewatering performance of sludge. Adding hydrogen peroxide to sludge destroys the microbial cell structure through oxidation, releasing bound water, thereby reducing the moisture content of sludge. Sludge treated with hydrogen peroxide is easier to remove water through mechanical dewatering equipment, reducing the volume of treated sludge and lowering transportation and treatment costs.

[0003] Hydrogen peroxide used in some existing pretreatment processes before deep sludge dewatering is usually stored on-site. However, high concentrations of hydrogen peroxide are corrosive and can cause leaks that damage the environment. Furthermore, hydrogen peroxide is easily heated and decomposes into oxygen, which can cause pressure rise in storage equipment and lead to explosions, posing certain safety hazards. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing hydrogen peroxide generators used in the pretreatment of sludge deep dewatering, which are usually stored on-site. However, high concentrations of hydrogen peroxide are corrosive and may cause leaks that damage the environment due to corrosion of metals and organic materials. Furthermore, hydrogen peroxide is prone to decomposition of oxygen by heat, which can lead to pressure rise in the storage equipment and cause explosions, posing certain safety hazards. This invention provides an in-situ hydrogen peroxide generator for sludge deep dewatering pretreatment.

[0005] The purpose of this utility model is achieved through the following technical solution: an in-situ hydrogen peroxide generator for deep dewatering pretreatment of sludge, including a sludge pretreatment tank, a hydrogen peroxide generator is installed on one side of the sludge pretreatment tank, a hydrogen peroxide temporary storage tank is installed at the outlet end of the hydrogen peroxide generator, and the outlet end of the hydrogen peroxide temporary storage tank is connected to a reagent delivery pipe through a delivery pump. The reagent delivery pipe is located at the upper part of the sludge pretreatment tank and has equidistant arrays of outlets. By setting up the hydrogen peroxide generator, hydrogen peroxide can be produced according to actual usage needs, effectively avoiding the hazards caused by on-site storage of hydrogen peroxide. The equidistant arrays of outlets on the reagent delivery pipe can evenly distribute hydrogen peroxide into the sludge pretreatment tank, ensuring the uniformity of hydrogen peroxide dosing.

[0006] A motor is installed on the sludge pretreatment tank. The power output end of the motor extends into the sludge pretreatment tank and is equipped with a spiral stirring blade. The spiral stirring blade is located below the chemical outlet. By setting the motor to drive the spiral stirring blade to rotate, the mixing between the upper and lower layers of sludge in the sludge pretreatment tank can be promoted. This ensures that the added hydrogen peroxide is evenly distributed in the sludge in the sludge pretreatment tank, avoiding dead zones in the sludge where no hydrogen peroxide has been added, and ensuring the effectiveness of hydrogen peroxide use.

[0007] A further technical solution is to install a galvanized anti-corrosion layer on the inner wall of the hydrogen peroxide storage tank. By installing the galvanized anti-corrosion layer, the corrosion of the hydrogen peroxide storage tank by hydrogen peroxide can be effectively reduced, thus effectively extending the service life of the hydrogen peroxide storage tank.

[0008] A further technical solution involves installing a level sensor on the hydrogen peroxide storage tank. The level sensor is located at the top of the hydrogen peroxide storage tank and is an ultrasonic level sensor. By using an ultrasonic level sensor, the amount of hydrogen peroxide in the storage tank can be effectively measured. When the amount of hydrogen peroxide reaches the set level, the hydrogen peroxide generator can be controlled to stop producing hydrogen peroxide, thus avoiding waste due to excessive hydrogen peroxide. The ultrasonic level sensor can also avoid direct contact with hydrogen peroxide to prevent corrosion, thereby improving the service life of the level sensor.

[0009] A further technical solution is that the hydrogen peroxide generator is connected to a water inlet pipe and an oxygen inlet pipe respectively. The hydrogen peroxide generator is a gas diffusion electrode reactor. Setting the hydrogen peroxide generator as a gas diffusion electrode reactor can enable oxygen in the cathode electrolyte to fully contact the gas diffusion electrode on the membrane electrode, greatly improving the reaction rate and thus rapidly generating hydrogen peroxide to meet the actual use requirements of the group.

[0010] A further technical solution is to install a negative pressure fan on the sludge pretreatment tank. The outlet of the negative pressure fan is connected to an external gas treatment device. By connecting the outlet of the negative pressure fan to the external gas treatment device, a large amount of toxic and harmful gases generated by the motor and spiral mixing blades in the sludge can be recovered and treated, preventing the toxic and harmful gases from spreading to the outside and causing pollution.

[0011] This invention has the following advantages: By setting up a hydrogen peroxide generator, it can produce hydrogen peroxide according to actual usage needs, effectively avoiding the hazards caused by on-site storage of hydrogen peroxide. The agent delivery pipe has an evenly spaced array of outlets, which can evenly distribute hydrogen peroxide into the sludge pretreatment tank, ensuring the uniformity of hydrogen peroxide addition. By setting up a motor to drive the spiral stirring blades to rotate, it can promote the mixing between the upper and lower layers of sludge in the sludge pretreatment tank, thereby making the added hydrogen peroxide evenly distributed in the sludge in the sludge pretreatment tank, avoiding the existence of dead zones in the sludge without added hydrogen peroxide, and ensuring the effectiveness of hydrogen peroxide use. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 2 This is a cross-sectional view of the hydrogen peroxide storage tank of this utility model.

[0014] In the diagram, 1. Sludge pretreatment tank; 2. Hydrogen peroxide generator; 3. Hydrogen peroxide temporary storage tank; 4. Transfer pump; 5. Chemical delivery pipe; 6. Chemical outlet; 7. Motor; 8. Spiral agitator blades; 9. Negative pressure fan; 10. Liquid level sensor; 11. Galvanized anti-corrosion layer. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0017] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0018] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] like Figures 1-2 As shown, an in-situ hydrogen peroxide generator for deep dewatering pretreatment of sludge includes a sludge pretreatment tank 1. A hydrogen peroxide generator 2 is installed on one side of the sludge pretreatment tank 1. A hydrogen peroxide temporary storage tank 3 is installed at the outlet end of the hydrogen peroxide generator 2. The outlet end of the hydrogen peroxide temporary storage tank 3 is connected to a reagent delivery pipe 5 through a delivery pump 4. The reagent delivery pipe 5 is located at the upper part of the sludge pretreatment tank 1. The reagent delivery pipe 5 has equidistant arrays of outlets 6. By setting up the hydrogen peroxide generator 2, hydrogen peroxide can be produced according to actual usage needs, effectively avoiding the hazards caused by on-site storage of hydrogen peroxide. The equidistant arrays of outlets 6 on the reagent delivery pipe 5 can evenly distribute hydrogen peroxide into the sludge pretreatment tank 1, ensuring the uniformity of hydrogen peroxide dosing.

[0022] A motor 7 is installed on the sludge pretreatment tank 1. The power output end of the motor 7 extends into the sludge pretreatment tank 1 and is equipped with a spiral stirring blade 8. The spiral stirring blade 8 is located below the chemical outlet 6. By setting the motor 7 to drive the spiral stirring blade 8 to rotate, the mixing between the upper and lower layers of sludge in the sludge pretreatment tank 1 can be promoted, so that the added hydrogen peroxide is evenly distributed in the sludge in the sludge pretreatment tank 1, avoiding the existence of dead zones in the sludge where no hydrogen peroxide has been added, and ensuring the effectiveness of hydrogen peroxide use.

[0023] The inner wall of the hydrogen peroxide storage tank 3 is provided with a galvanized anti-corrosion layer 11. By providing the galvanized anti-corrosion layer 11, the corrosion of the hydrogen peroxide storage tank 3 by hydrogen peroxide can be effectively reduced, and the service life of the hydrogen peroxide storage tank 3 can be effectively extended.

[0024] A level sensor 10 is installed on the hydrogen peroxide storage tank 3. The level sensor 10 is located at the top of the hydrogen peroxide storage tank 3. The level sensor 10 is an ultrasonic level sensor. By setting the level sensor 10 to be an ultrasonic level sensor, the hydrogen peroxide in the hydrogen peroxide storage tank 3 can be effectively quantified. When the amount of hydrogen peroxide reaches the set amount, the hydrogen peroxide generator 2 can be controlled to stop producing hydrogen peroxide, avoiding waste due to excessive hydrogen peroxide. The ultrasonic level sensor can avoid direct contact with hydrogen peroxide to prevent corrosion, thus improving the service life of the level sensor 10.

[0025] The hydrogen peroxide generator 2 is connected to a water inlet pipe and an oxygen inlet pipe. The hydrogen peroxide generator 2 is a gas diffusion electrode reactor. Setting the hydrogen peroxide generator 2 as a gas diffusion electrode reactor can enable oxygen in the cathode electrolyte to fully contact the gas diffusion electrode on the membrane electrode, which greatly improves the reaction rate and thus quickly generates hydrogen peroxide to meet the actual use requirements of the group.

[0026] A negative pressure fan 9 is installed on the sludge pretreatment tank 1. The outlet of the negative pressure fan 9 is connected to an external gas treatment device. By connecting the outlet of the negative pressure fan 9 to the external gas treatment device, a large amount of toxic and harmful gases generated by the motor 7 and the spiral stirring blades 8 in stirring the sludge can be recovered and treated, thus preventing the toxic and harmful gases from spreading to the outside and causing pollution.

[0027] The working process of this utility model is as follows: When using this device, firstly, the concentration and volume of hydrogen peroxide to be added are set by the external controller, and the hydrogen peroxide generator 2 is turned on to produce hydrogen peroxide of the required concentration. The hydrogen peroxide flows into the hydrogen peroxide storage tank 3 for temporary storage. When the liquid level sensor 10 detects that the required volume of hydrogen peroxide has reached the requirement, it sends a signal to the external controller. The external controller controls the hydrogen peroxide generator 2 to turn off. Then, the external controller controls the delivery pump 4 to start and discharge the hydrogen peroxide temporarily stored in the hydrogen peroxide storage tank 3 into the sludge in the sludge pretreatment tank 1 through the agent delivery pipe 5 and the agent outlet 6. At the same time, the motor 7 drives the spiral stirring blades 8 to stir, ensuring that the hydrogen peroxide is evenly distributed. The negative pressure fan 9 collects the generated odor to the external gas treatment equipment for harmless treatment.

[0028] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sludge deep dewatering pretreatment in-situ hydrogen peroxide generator comprising a sludge pretreatment tank (1), characterized in that: The sludge pretreatment tank (1) is provided with a hydrogen peroxide generator (2) on one side, the liquid outlet end of the hydrogen peroxide generator (2) is provided with a hydrogen peroxide temporary storage tank (3), the liquid outlet end of the hydrogen peroxide temporary storage tank (3) is connected with a medicament conveying pipe (5) through a conveying pump (4), the medicament conveying pipe (5) is located at the upper part of the sludge pretreatment tank (1), and a plurality of medicine outlet ports (6) are arranged on the medicament conveying pipe (5) in an equidistant array. A motor (7) is installed on the sludge pretreatment tank (1), the power output end of the motor (7) extends into the sludge pretreatment tank (1) and is provided with a spiral stirring blade (8), and the spiral stirring blade (8) is located below the medicine outlet port (6).

2. The in-situ hydrogen peroxide generator for sludge deep dewatering pretreatment according to claim 1, characterized in that: A zinc-plated anticorrosive layer (11) is arranged on the inner side wall of the hydrogen peroxide temporary storage tank (3).

3. The in-situ hydrogen peroxide generator for sludge deep dewatering pretreatment according to claim 1 or 2, characterized in that: A liquid level sensor (10) is installed on the hydrogen peroxide temporary storage tank (3), the liquid level sensor (10) is arranged at the upper part of the hydrogen peroxide temporary storage tank (3), and the liquid level sensor (10) is an ultrasonic liquid level sensor.

4. The in-situ hydrogen peroxide generator for sludge deep dewatering pretreatment according to claim 1, characterized in that: The hydrogen peroxide generator (2) is connected with a water inlet pipe and an oxygen inlet pipe, respectively, and the hydrogen peroxide generator (2) is a gas diffusion electrode reactor.

5. The in-situ hydrogen peroxide generator for sludge deep dewatering pretreatment according to claim 1, characterized in that: A negative pressure fan (9) is installed on the sludge pretreatment tank (1), and the gas outlet end of the negative pressure fan (9) is connected with an external gas treatment device.

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