A slow-release material reaction device with adjustable release rate for sewage treatment

Abstract

The invention discloses a slow-release material reaction device with adjustable release rate for sewage treatment, which is composed of a shell, an air lift center tube, a top baffle, a slow-release material, a mesh plate, an air baffle, a bottom aerator, an air lift air duct, a No. 1 valve and a No. 2 valve; the invention uses air to achieve three different strengths of slow-release material release rates: 1) conventional immersion natural slow-release mode; 2) a circulating water flow contact slow-release mode with variable water flow rate flushing; 3) an air-water enhanced slow-release mode with air-water mixed flushing. The invention can adjust the release rate of the slow-release material according to the fluctuation of sewage water quality, which not only ensures the impact resistance of the slow-release material, but also avoids the waste of the slow-release material.

Description

Technical Field

[0001] The invention relates to a slow-release material reaction device with adjustable release rate for sewage treatment, belonging to the technical field of sewage treatment. Background Art

[0002] In the process of sewage treatment, in order to effectively remove pollutants in sewage, various agents need to be added to remove target pollutants, such as carbon sources, phosphorus removal agents, specific microorganisms, etc. In large-scale sewage treatment plants, due to the large amount of agents used, a dosing system is generally set up, and the agents are added to the sewage treatment system in the form of liquid to remove pollutants. For large-scale sewage treatment plants with sufficient operating personnel, this agent addition method is simple and effective.

[0003] For small and medium-sized sewage treatment systems, due to limited operating personnel, the use of large-scale sewage treatment plant reagent dosing method will greatly increase the labor operation cost of the sewage treatment system. Therefore, in recent years, a variety of slow-release reagent materials have appeared on the market for small and medium-sized sewage treatment systems, such as slow-release carbon sources, slow-release phosphorus removal agents, slow-release bacterial agents, etc. These slow-release materials are easy to use and only need to be placed in the sewage treatment system. The reagents will be slowly released into the sewage to remove pollutants.

[0004] Although the various slow-release materials mentioned above are simple and convenient to use, they only need to be placed in a designated location to release slowly. However, due to their slow release rate, slow-release materials cannot cope with the fluctuation of the water quality of the influent sewage. When the pollutant concentration is high, the release rate of the agent is insufficient, and when the pollutant concentration is low, the release rate of the agent is excessive, resulting in the slow-release material being either insufficient in effect or consumed too quickly. The slow-release material achieves the purpose of convenient operation and management, but does not have sufficient water quality impact resistance. Summary of the invention

[0005] Most slow-release materials have problems of insufficient release or excessive consumption when used in sewage treatment systems, which limits the application of slow-release materials. Slow-release materials must be able to self-regulate the release rate of the agent according to changes in sewage quality to ensure the effective application of slow-release materials.

[0006] The purpose of the present invention is to provide a slow-release material reaction device with adjustable release rate to address the problems existing in the existing slow-release materials in small and medium-sized sewage treatment; the present invention has three working modes, which can solve the reaction efficiency problem of the slow-release material.

[0007] To achieve the above technical objectives, the technical solution adopted by the present invention is as follows: a slow-release material reaction device with adjustable release rate for sewage treatment, the device is suspended in the sewage to be treated, and consists of a shell, an air lift center pipe, a top baffle, a slow-release material, a mesh plate, an air baffle, a bottom aerator, an air lift air duct, a No. 1 valve and a No. 2 valve;

[0008] The shell is a hollow column structure, the mesh plate is horizontally fixed in the shell, and a through hole is opened in the middle of the mesh plate, and the gas lift center tube passes through the through hole and is vertically arranged in the shell; the slow-release material is arranged on the mesh plate and arranged in a ring along the space between the shell and the gas lift center tube; the top baffle is fixedly arranged just above the gas lift center tube;

[0009] The air baffle is horizontally arranged directly below the air lift center tube; one end of the air lift air duct is arranged between the air lift center tube and the air baffle, and the other end is connected to the air source; a No. 1 valve is installed on the air lift air duct; the bottom aerator is arranged in the shell and is located below the air baffle; the bottom aerator is connected to the air source through the air duct, and a No. 2 valve is installed on the air duct.

[0010] Preferably, the device has three working modes:

[0011] 1) Immersed natural slow-release mode: In this mode, valves 1 and 2 are both closed, the device is immersed in water, and the agent is slowly released through contact with sewage at its bottom;

[0012] 2) Circulating water contact slow-release mode: In this mode, only valve No. 1 is opened, and water is sucked from the bottom of the device to the gas lift center tube and rises to the top baffle. It is blocked by the top baffle and flows back to the slow-release material. After contacting the slow-release material, it is released from the bottom of the device into the sewage system. The contact mode between the slow-release material and the liquid is changed from immersion contact to water flow flushing contact, which increases the release rate of the slow-release material.

[0013] 3) Air-water enhanced slow-release mode: In this mode, only valve No. 2 is opened. Air is released from the bottom aerator to all slow-release material areas in the device except the middle air lift center tube. Water flows up from the bottom of the device with the air and overflows from the outer circle at the top of the device to the sewage system. Air and water flush the slow-release material at the same time, forming a process of external circulation of water flow.

[0014] Preferably, it is characterized in that the top of the shell is higher than the top of the air lift center tube and the water surface, ensuring that no overflow occurs during the air lift process of the air lift center tube, but in the third working mode when the No. 2 valve is opened, overflow water can flow to the sewage system; the position of the lower edge of the shell is lower than the bottom aerator, ensuring that the air of the bottom aerator is not released outside the device.

[0015] Preferably, the feature is that the top baffle is in the shape of a hollow cone, with the end with a larger diameter facing downward, and the diameter below the top baffle is larger than the diameter of the gas lift center tube.

[0016] Preferably, it is characterized in that the initial position of the device when placed in sewage is such that the top surface of the slow-release material is flush with the sewage surface.

[0017] Preferably, both valve No. 1 and valve No. 2 are automatic regulating valves.

[0018] The present invention has the following advantages:

[0019] 1. The present invention utilizes two gas lift methods to increase the release rate of the sustained-release material, and combined with the conventional immersion contact method, realizes three operation modes, thus ensuring the effective utilization of the sustained-release material;

[0020] 2. The present invention can realize the control of the release rate of the sustained-release material by only connecting to an air source, and the device is simple and easy to use;

[0021] 3. The sustained-release material of the present invention is highly easy to observe and convenient to replenish the sustained-release material. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional schematic diagram of the present invention;

[0023] Figure 2 It is a top schematic diagram of the present invention. Implementation

[0024] The specific embodiments of the present invention are further described below in conjunction with examples. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each embodiment of the present invention described below can be combined with each other as long as they do not conflict with each other. If the specific technology, connection relationship or conditions are not indicated in the embodiments, the technology, connection relationship, conditions described in the literature in this field or the product specifications are carried out. If the materials, instruments or equipment used do not indicate the manufacturer, they are all conventional products that can be purchased.

[0025] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "setting" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention are understood according to specific circumstances.

[0026] like Figure 1 and Figure 2As shown, the present invention provides a slow-release material reaction device with adjustable release rate for sewage treatment, the device is suspended in the sewage to be treated, and is composed of a shell 1, an air lift center tube 2, a top baffle 3, a slow-release material 4, a mesh plate 5, an air baffle 6, a bottom aerator 7, an air lift air duct 8, a first valve 9 and a second valve 10; the suspension method of the present invention can be to hang the device around with an iron chain or to set a detachable truncated cone cover on the top to hang the device, and to open holes around the top of the device to ensure that water overflows out of the device in the third operating mode, so as to facilitate observation and replacement of the slow-release material;

[0027] The shell 1 is a hollow cylindrical structure, the mesh plate 5 is horizontally fixed in the shell 1, and a through hole is opened in the middle of the mesh plate 5. The gas lift center tube 2 passes through the through hole and is vertically arranged in the shell 1. The connection between the gas lift center tube 2 and the mesh plate 5 is fixed to fix the gas lift center tube 2; the slow-release material 4 is arranged on the mesh plate 5 and arranged in a ring along the space between the shell 1 and the gas lift center tube 2; the top baffle 3 is fixedly arranged directly above the gas lift center tube 2, specifically: the top baffle 3 can be connected to the gas lift center tube 2 through a connecting rod, or connected to the shell 1 through a connecting rod; in the present invention, the diameter of the gas lift center tube 2 can be determined according to the corresponding sewage treatment volume and sewage water quality. The larger the required gas lift volume, the larger the diameter of the gas lift center tube 2; the initial position of the present invention in the sewage is that the top surface of the slow-release material is flush with the sewage water surface (that is, the slow-release material is just submerged by the water surface);

[0028] The air baffle 6 is horizontally arranged directly below the air lift central tube 2, and is arranged at a certain distance from the air lift central tube 2. The area of ​​the air baffle 6 is greater than or equal to the cross-sectional area of ​​the air lift central tube 2. The air baffle 6 can be connected to the air lift central tube 2 through a connecting rod, or connected to the shell 1 through a connecting rod. When the bottom aerator 7 is turned on, the air baffle 6 can block air from entering the air lift central tube 2. When the air lift duct is turned on, water can enter the air lift central tube 2 from the bottom. The top of the air lift central tube 2 is higher than the water surface, but lower than the height of the top of the shell 1, and does not overflow from the device during the air lift process. One end of the air lift duct 8 is arranged between the air lift central tube 2 and the air baffle 6, and the other end is connected to the air source; a valve No. 1 9 is installed on the air lift duct 8; the bottom aerator 7 is arranged in the shell 1 and is located below the air baffle 6; there are multiple bottom aerators 7; the bottom aerator 7 is connected to the air source through an air duct, and a valve No. 2 10 is installed on the air duct; the air duct is a hard pipe fitting, and the bottom aerator 7 can be fixed below the air baffle 6; valve No. 1 9 and valve No. 2 10 are both automatic regulating valves, and are linked with water quality indicators to effectively respond to changes in water quality.

[0029] Specifically, the device of the present invention has three working modes:

[0030] 1) Immersed natural slow-release mode: In this mode, valve No. 1 9 and valve No. 2 10 are all closed, and the device is equivalent to being immersed in water, and the agent is slowly released through its bottom contacting with sewage;

[0031] 2) Circulating water contact slow-release mode: In this mode, only valve No. 1 9 is opened, and water is sucked from the bottom of the device to the gas lift center pipe 2 and rises to the top baffle 3. It is blocked by the top baffle 3 and flows back to the slow-release material. After contacting the slow-release material, it is released from the bottom of the device into the sewage system. The contact mode between the slow-release material and the liquid is changed from immersion contact to water flow flushing contact, which increases the release rate of the slow-release material;

[0032] 3) Air-water enhanced slow-release mode: In this mode, only valve No. 2 10 is opened, and air is released from the bottom aerator 7 to all slow-release material areas in the device except the middle air lift center tube. Water flows from the bottom of the device with the air and overflows from the outer ring of the top of the device to the sewage system. Air and water flush the slow-release material at the same time, and form a process of water flow external circulation. The release rate of the slow-release material can reach the maximum; when the second and third working modes are adopted, the air lift flow rate can be adjusted by adjusting the opening degree of the valve, and the contact rate between sewage and materials and the contact rate between air and water and materials can be controlled according to actual needs. This device is specially set up for direct contact between air and slow-release materials to ensure that some air-sensitive slow-release materials can quickly release the agent under the flushing action of air to complete the pollutant reaction.

[0033] A further optimized solution is that the top of the shell 1 is higher than the top of the air lift central tube 2 and the water surface, ensuring that no overflow will occur during the air lift process of the air lift central tube 2, but in the third working mode when the No. 2 valve 10 is opened, overflow water can flow to the sewage system; the position of the lower edge of the shell 1 is lower than the bottom aerator 7, ensuring that the air of the bottom aerator 7 is not released outside the device; the top baffle 3 is a hollow cone shape, with the end with a larger diameter facing downward, and the diameter below the top baffle 3 is larger than the diameter of the air lift central tube 2; the opening on the top of the top baffle 3 is used to release air for air lift, and other areas are used to block the air lift water flow, so that the water flow can flow back evenly to the slow-release material area in the device.

[0034] The present invention can adjust the release rate of the slow-release material accordingly according to the fluctuation of sewage quality, thereby ensuring the impact resistance of the slow-release material and avoiding the waste of the slow-release material, so that the slow-release material can be better used in practice. Example

[0035] This example is applied to 5m 3 / d integrated rural sewage device case, the device shell diameter in this case is 400mm, the internal air lift pipe diameter is 32mm, the bottom aerator uses a DN300 disc aerator, the slow-release material is a slow-release carbon source, the particle size is 3-6cm, and the bottom uses a 5mm mesh plate to block the slow-release carbon source. The device is placed in the anoxic tank of the sewage device. The release rate of the slow-release carbon source is moderate, and the carbon source in the influent is sufficient. Therefore, the first operation mode is used during normal operation, and the second operation mode is used when the total nitrogen concentration in the sewage is high. Example

[0036] This example is applied to 5m 3 / d integrated rural sewage device case, the device shell diameter in this case is 300mm, the internal air lift pipe diameter is 25mm, the bottom aerator uses a DN200 disc aerator, the slow-release material is a slow-release phosphorus remover, the phosphorus remover is a 2-5cm disc type, and a 5mm mesh plate is used at the bottom to block the slow-release phosphorus remover, and the device is placed in the outlet pool. The release rate of the slow-release phosphorus remover is low, so the second operation mode needs to be used during normal operation. When the total phosphorus concentration in the sewage is high, the third operation mode is used.

[0037] It is understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effects; as long as the use requirements are met, they are within the protection scope of the present invention.

Claims

1. A slow-release material reaction device with adjustable release rate for sewage treatment, characterized in that: The device is suspended in the sewage to be treated, and comprises a shell (1), an air lift central tube (2), a top baffle (3), a slow-release material (4), a mesh plate (5), an air baffle (6), a bottom aerator (7), an air lift duct (8), a first valve (9), and a second valve (10); The shell (1) is a hollow column structure, the mesh plate (5) is horizontally fixed in the shell (1), and a through hole is opened in the middle of the mesh plate (5), and the gas lift central tube (2) passes through the through hole and is vertically arranged in the shell (1); the slow-release material (4) is arranged on the mesh plate (5) and arranged in a ring shape along the space between the shell (1) and the gas lift central tube (2); the top baffle (3) is fixedly arranged directly above the gas lift central tube (2); The air baffle (6) is horizontally arranged directly below the air lift central tube (2); one end of the air lift air duct (8) is arranged between the air lift central tube (2) and the air baffle (6), and the other end is connected to the air source; a No. 1 valve (9) is installed on the air lift air duct (8); the bottom aerator (7) is arranged in the housing (1) and is located below the air baffle (6); the bottom aerator (7) is connected to the air source via an air duct, and a No. 2 valve (10) is installed on the air duct; The device has three working modes: 1) Immersed natural slow-release mode: In this mode, valve No. 1 (9) and valve No. 2 (10) are both closed, the device is immersed in water, and the agent is slowly released through contact between its bottom and sewage; 2) Circulating water contact slow-release mode: In this mode, only valve No. 1 (9) is opened, and water is sucked from the bottom of the device to the gas lift center tube (2) and rises to the top baffle (3). It is blocked by the top baffle (3) and flows back to the slow-release material. After contacting the slow-release material, it is released from the bottom of the device into the sewage system. The contact mode between the slow-release material and the liquid is changed from immersion contact to water flow flushing contact, thereby increasing the release rate of the slow-release material; 3) Air-water enhanced slow-release mode: In this mode, only valve No. 2 (10) is opened, and air is released from the bottom aerator (7) to all slow-release material areas in the device except the middle air lift center tube. Water flows from the bottom of the device up with the air and overflows from the outer ring of the top of the device to the sewage system. The air and water simultaneously flush the slow-release material and form a process of water flow external circulation.

2. The slow-release material reaction device with adjustable release rate for sewage treatment according to claim 1, characterized in that: The top of the shell (1) is higher than the top of the air lift center tube (2) and the water surface, ensuring that no overflow occurs during the air lift process of the air lift center tube (2). However, in the third working mode when the No. 2 valve (10) is opened, overflow water can flow to the sewage system; the position of the bottom edge of the shell (1) is lower than the bottom aerator (7), ensuring that the air in the bottom aerator (7) is not released outside the device.

3. The slow-release material reaction device with adjustable release rate for sewage treatment according to claim 1, characterized in that: The top baffle (3) is in the shape of a hollow cone, with the end with a larger diameter facing downward, and the diameter below the top baffle (3) is larger than the diameter of the gas lift center tube (2).

4. The slow-release material reaction device with adjustable release rate for sewage treatment according to claim 1, characterized in that: The initial position of the device when placed in sewage is that the top surface of the slow-release material is flush with the sewage surface.

5. The slow-release material reaction device with adjustable release rate for sewage treatment according to claim 1, characterized in that: Both valve No. 1 (9) and valve No. 2 (10) are automatic regulating valves.

Images