Efficient sludge reduction device for municipal sewage treatment plant

Abstract

The utility model discloses an efficient sludge reduction device for a municipal sewage treatment plant, which belongs to the technical field of sludge treatment and comprises a sludge preheater, a dosing stirrer and a sludge-water separator, an outlet of the sludge preheater is connected with an inlet of the dosing stirrer, and an outlet of the dosing stirrer is connected with an inlet of the sludge-water separator. According to the utility model, the wall breaking efficiency of the sludge and the mass transfer efficiency of the flocculation reaction are remarkably enhanced by implementing the pre-treatment technologies of preheating, ultrasonication and chemical agent reaction in stages, so that the dosage of chemical agents is effectively reduced, the compression performance of the sludge is improved, and the energy consumption is reduced. According to the efficient reduction device for the sludge, the water content of the sludge subjected to synergistic quenching and tempering treatment through ultrasound and chemical agents is remarkably reduced under the filter pressing action of the sludge-water separator, and then the purpose of efficient reduction of the sludge is achieved. And the overall efficiency of sludge treatment is further improved.

Description

Technical Field

[0001] This utility model relates to the technical field of sludge treatment, and in particular to a high-efficiency sludge reduction device for urban sewage treatment plants. Background Technology

[0002] Against the backdrop of rapid urbanization, urban wastewater treatment plants, as a core component of urban infrastructure, bear the dual responsibility of wastewater treatment and environmental protection. However, with the continuous growth of the urban population and the constant improvement of residents' living standards, wastewater treatment plants are facing increasingly severe challenges, especially the generation and treatment of sludge, which has become a major constraint on their development.

[0003] Sludge, an unavoidable byproduct of wastewater treatment, has a complex and diverse composition, including organic residues, bacterial cells, inorganic particles, and colloids, exhibiting significant heterogeneous characteristics. Its high water content and abundant organic matter make sludge highly susceptible to putrefaction and emit foul odors, posing significant challenges to subsequent treatment processes at wastewater treatment plants and creating a potential threat of secondary pollution to the surrounding environment.

[0004] Currently, urban wastewater treatment plants commonly employ sludge thickening and dewatering technologies to reduce sludge volume. Chinese Patent CN 211620338 U discloses a sludge solid-liquid separation device, which includes a rotatable separation cylinder with a filter screen structure, capable of improving sludge solid-liquid separation efficiency to some extent. However, simply using physical methods for sludge thickening and dewatering is insufficient to significantly reduce the water content, resulting in low treatment efficiency. In sludge treatment processes, large amounts of chemical agents are typically introduced to enhance flocculation and dewatering efficiency. However, temperature significantly regulates the effectiveness of these chemical agents; lower sludge temperatures may reduce agent activity, thus affecting dewatering. This not only increases treatment costs but may also lead to a reverse increase in sludge volume, severely weakening the volume reduction effect. Faced with this challenge, how to effectively reduce energy consumption and chemical usage while ensuring sludge treatment efficiency, achieving efficient and environmentally friendly sludge volume reduction, has become a pressing technical problem in the wastewater treatment field. In response to this challenge, the development of new sludge reduction equipment is particularly crucial and urgent. Summary of the Invention

[0005] The purpose of this invention is to provide a device for efficient reduction of sludge in urban sewage treatment plants.

[0006] To achieve the objective of this utility model, the technical solution is as follows:

[0007] A high-efficiency sludge reduction device for urban wastewater treatment plants includes a sludge preheater, a dosing mixer, and a sludge-water separator.

[0008] The dosing mixer includes a dosing port, a discharge port, a feed port, a drive motor, a drive column, stirring blades, and an ultrasonic transmitter. The drive motor is located at the top of the dosing mixer, and one end of the output shaft of the drive motor extends into the interior of the dosing mixer. The bottom of the output shaft of the drive motor is fixedly connected to the drive column, and the drive column is fixedly connected to the stirring blades. The ultrasonic transmitter is fixedly connected to the drive column and connected to the drive motor.

[0009] The outlet of the sludge preheater is connected to the inlet of the dosing agitator, and the outlet of the dosing agitator is connected to the inlet of the sludge-water separator.

[0010] Furthermore, a guide plate is fixedly connected below the drive column of the dosing agitator and inside the dosing agitator; the guide plate has several filter holes with filter screens installed on them; inside the dosing agitator, below the guide plate is a wastewater storage chamber, and a wastewater discharge port is provided on the side wall of the wastewater storage chamber.

[0011] Furthermore, the discharge port is located above the guide plate.

[0012] Furthermore, the dosing port of the dosing agitator is connected to the dosing control pump.

[0013] Furthermore, the ultrasonic transmitter is fixedly connected to the connection between the drive column and the stirring blade, and an ultrasonic transmitter is provided at the connection between the drive column and each stirring blade.

[0014] Furthermore, the sludge preheater is a serpentine sleeve, with the inner tube of the serpentine sleeve serving as a sludge conveying pipeline; a heating medium flows between the inner and outer tubes of the serpentine sleeve.

[0015] Furthermore, the mud-water separator can be selected from a vacuum filter, a plate and frame filter press, or a belt filter press.

[0016] This invention employs a serpentine sleeve for preheating sludge to maximize its flocculation efficiency when chemical agents are added in subsequent stages. Ultrasonic technology is integrated into the dosing system to enhance the sludge's cell wall breaking efficiency and mass transfer efficiency of the flocculation reaction, thereby effectively reducing the amount of chemical agents used and improving the sludge's compressibility. After synergistic conditioning with ultrasound and chemical agents, the sludge undergoes a significant reduction in moisture content under the mechanical filtration of the sludge-water separator, achieving the goal of efficient sludge reduction. This efficient sludge reduction device, by integrating ultrasonic technology into the dosing system, not only significantly reduces the equipment's footprint but also further improves the overall efficiency of sludge treatment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2This is a schematic diagram of the structure of the dosing mixer of this utility model.

[0019] Among them, 1 is the sludge preheater, 2 is the dosing agitator, 3 is the sludge-water separator, 20 is the drive motor, 21 is the dosing port, 22 is the drive column, 23 is the agitator blade, 24 is the ultrasonic transmitter, 25 is the discharge port, 26 is the sewage discharge port, 27 is the feed port, 28 is the guide plate, 281 is the filter hole, and 29 is the sewage storage bin. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art through creative effort are within the scope of protection of the present application.

[0021] In the description of the embodiments of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application 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 the embodiments of this application.

[0022] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 the embodiments of this application based on the specific circumstances.

[0023] like Figure 1 As shown, a high-efficiency sludge reduction device for urban wastewater treatment plants includes a sludge preheater 1, a chemical dosing agitator 2, and a sludge-water separator 3. The outlet of the sludge preheater 1 is connected to the inlet of the chemical dosing agitator 2, and the outlet of the chemical dosing agitator 2 is connected to the inlet of the sludge-water separator 3. Furthermore, a sludge-water containing water is transported to the sludge preheater 1 by a sludge transfer pump.

[0024] In this embodiment, as Figure 1As shown, the sludge preheater 1 is a serpentine sleeve, with the inner tube of the serpentine sleeve serving as a sludge conveying pipeline; a heating medium, such as hot water, flows between the inner and outer tubes of the serpentine sleeve. The sludge is preheated using hot water.

[0025] like Figure 2 As shown, the dosing mixer 2 includes a dosing port 21, a discharge port 25, a feed port 27, a drive motor 20, a drive column 22, stirring blades 23, a wastewater storage bin 29, and a wastewater discharge port 26. Further, the outlet of the sludge preheater 1 is connected to the feed port 27 of the dosing mixer 2, and the discharge port 25 of the dosing mixer 2 is connected to the inlet of the sludge-water separator 3. The drive motor 20 is located at the top of the dosing mixer 2, with one end of its output shaft extending into the interior of the dosing mixer 2. The bottom of the output shaft of the drive motor 20 is fixedly connected to the drive column 22, and the stirring blades 23 are fixedly connected to the drive column 22. Below the drive column 22, a guide plate 28 is fixedly connected inside the dosing mixer 2. The guide plate 28 has several filter holes 281, and filter screens are provided on the filter holes 281. The discharge port 25 is located above the guide plate 28 to facilitate sludge discharge. The dosing port 21 of the dosing agitator 2 is located at the top of the dosing agitator 2, with an opening leading into the interior of the dosing agitator 2. The dosing port 21 is connected to the dosing control pump to control the amount of chemical added. Below the guide plate 28 is the wastewater storage chamber 29 of the dosing agitator 2, and the wastewater storage chamber 29 has a wastewater discharge port 26 on its side wall.

[0026] Furthermore, the dosing agitator 2 is also equipped with an ultrasonic transmitter 24, which is fixedly connected to the junction of the drive column 22 and the stirring blade 23. The ultrasonic transmitter 24 is connected to the drive motor 20 via a circuit on the drive column 22, enabling its switching on and off. An ultrasonic transmitter 24 can be installed at the junction of the drive column 22 and each stirring blade 23. Ultrasonic waves, acting as mechanical waves on sludge, can generate mechanical shear forces in the propagation medium, causing damage to the sludge floc structure and significant changes in moisture distribution. The input of ultrasonic energy generates microbubbles in the liquid phase. These bubbles absorb energy and contract and rupture within a short time, i.e., cavitation. The localized high temperature and pressure caused by cavitation can generate a large number of hydroxyl radicals in nearby water molecules, which can quickly damage the cell walls of microorganisms in the sludge, releasing intracellular organic matter into the liquid phase. The number and distribution of ultrasonic transmitters 24 directly affect dewatering performance. If the ultrasonic transmitters 24 are placed on the side wall or the guide plate 28 of the dosing agitator 2, the generated mechanical shear forces will be uneven. By placing the ultrasonic transmitter 24 at the junction of the drive column 22 and the stirring blade 23, when the ultrasonic transmitter 24 is working, coupled with low-speed rotation and stirring, the ultrasonic waves can act more evenly on the sludge.

[0027] The working process of the dosing agitator 2 is as follows: After the preheated sludge enters through the feed inlet 27, the drive motor 20 is turned on and the ultrasonic transmitter 24 is activated. By using a low speed, the ultrasonic waves, for example, for a duration of 2 to 35 seconds, destroy the cell walls of the microorganisms in the sludge. Then, a certain amount of chemical agent is added through the dosing port 21. The speed of the drive column is increased to ensure that the chemical agent and the sludge are fully mixed and stirred. The ultrasonic waves can improve the mass transfer efficiency between the sludge and the chemical agent, thereby increasing the dewatering rate. Water continuously flows out of the sludge and into the wastewater storage chamber 29 through the filter holes 281. After a certain period of time, the discharge port 25 is opened to discharge the sludge with reduced water content.

[0028] The sludge-water separator 3 primarily uses mechanical dewatering, such as vacuum filters, plate and frame filter presses, or belt filter presses. This mechanical dewatering further reduces the water content in the sludge, achieving sludge volume reduction and facilitating subsequent sludge resource utilization and transportation.

[0029] A high-efficiency sludge reduction device for urban wastewater treatment plants employs a serpentine sleeve for sludge preheating, ensuring enhanced mass transfer efficiency and maximizing flocculation effectiveness when adding chemical agents in subsequent stages. Simultaneously, the serpentine sleeve increases the heating area, effectively reducing energy consumption. In the dosing system, the sludge first undergoes ultrasonic treatment to enhance cell wall disruption, followed by flocculation through chemical agents, causing small particles to aggregate and free water and some interstitial water to precipitate, thereby improving the sludge's compressibility. Finally, the sludge, after synergistic conditioning with ultrasound and chemical agents, undergoes mechanical filtration in a sludge-water separator, resulting in a significant reduction in moisture content and achieving the goal of high-efficiency sludge reduction. This high-efficiency sludge reduction device, by integrating ultrasonic technology into the dosing system, not only significantly reduces the equipment's footprint but also further improves the overall efficiency of sludge treatment.

Claims

1. A device for efficient reduction of sludge in a municipal wastewater treatment plant, characterized by: The sludge high-efficiency reduction device comprises a sludge preheater (1), a dosing stirrer (2) and a sludge-water separator (3). The dosing stirrer (2) comprises a dosing opening (21), a discharge opening (25), a feeding opening (27), a driving motor (20), a driving column (22), stirring blades (23) and an ultrasonic transmitter (24). The driving motor (20) is located at the top of the dosing stirrer (2), the output shaft of the driving motor (20) extends into the dosing stirrer (2), and the bottom of the output shaft of the driving motor (20) is fixedly connected with the driving column (22), and the driving column (22) is fixedly connected with the stirring blades (23). The ultrasonic transmitter (24) is fixedly connected with the driving column (22) and connected with the driving motor (20). The outlet of the sludge preheater (1) is connected with the feeding opening (27) of the dosing stirrer (2), and the discharge opening (25) of the dosing stirrer (2) is connected with the inlet of the sludge-water separator (3).

2. The sludge efficient reduction device according to claim 1, characterized by: A guide plate (28) is fixedly connected below the driving column (22) of the dosing stirrer (2). A plurality of filter holes (281) are formed in the guide plate (28), and a filter screen is arranged on the filter holes (281). A sewage storage bin (29) is arranged below the guide plate (28) in the dosing stirrer (2), and a sewage discharge outlet (26) is formed in the side wall of the sewage storage bin (29).

3. The sludge efficient reduction device according to claim 2, characterized by: The discharge opening (25) is arranged above the guide plate (28).

4. The sludge efficient reduction device according to claim 2, characterized by: The dosing opening (21) of the dosing stirrer (2) is connected with a dosing control pump.

5. The sludge efficient reduction device according to claim 2, characterized by: The ultrasonic transmitter (24) is fixedly connected with the junction of the driving column (22) and the stirring blades (23), and the junction of the driving column (22) and each stirring blade (23) is provided with an ultrasonic transmitter (24).

6. The sludge efficient reduction device according to claim 1, characterized in that: The sludge preheater (1) is a serpentine sleeve, the inner tube of the serpentine sleeve is a sludge conveying pipeline, and a heating medium flows between the inner tube and the outer tube of the serpentine sleeve.

7. The sludge efficient reduction device according to claim 1, characterized in that: The sludge-water separator (3) is selected from a vacuum filter, a plate-and-frame filter press or a belt filter press.

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