A wastewater treatment plant reagent dosing system

Abstract

This utility model relates to the field of wastewater treatment technology, specifically to a wastewater treatment plant reagent dosing system, including a mixing tank, a conveying pipeline, a rotary nozzle, a venturi tube, and a gas supply pipeline. The mixing tank is equipped with a reagent inlet and a water inlet for adding reagents and water. A discharge outlet is located at the bottom of the mixing tank and is connected to the conveying pipeline to transport the reagent solution to the downstream end. A rotary nozzle is located at the end of the conveying pipeline, and a venturi tube is located at the front end of the rotary nozzle. The throat of the venturi tube is connected to the gas supply pipeline. This utility model has a simple structure, is easy to use, and can be applied to the uniform dosing of various types of reagents in a plant, playing a positive role in ensuring reagent dosing efficiency. Furthermore, it has low modification costs and is convenient for practical production use.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a wastewater treatment plant reagent dosing system. Background Technology

[0002] Various agents are required in the wastewater treatment process, such as carbon sources added to biological tanks, sodium hypochlorite added during sludge expansion, PAM and PAC added to high-efficiency sedimentation tanks, and polyferric sulfate used in sludge treatment sections. The stable addition of various agents plays a positive role in ensuring the stable operation of the wastewater treatment system.

[0003] In wastewater treatment, current methods of chemical dosing are mostly direct, such as directly transporting liquid carbon sources to the front end of the anoxic tank. Due to the time required for mass transfer, this can lead to excessively high chemical concentrations in certain areas of the tank. This results in unnecessary chemical consumption, affects dosing efficiency and effectiveness, increases chemical costs, and can even impact the stability of the biological treatment tank. For example, excessively high local concentrations of sodium hypochlorite solution can disinfect not only filamentous bacteria but also beneficial bacteria, affecting the stable operation of the tank. Over time, the resulting increase in chemical costs and the impact on process stability cannot be ignored.

[0004] Therefore, in actual production, it is necessary to add the various agents in the wastewater treatment plant in a stable and uniform manner to improve the dispersion efficiency of the agents in the reaction tank. This is of positive significance for reducing agent consumption, ensuring agent treatment efficiency, and ensuring the stable operation of the wastewater treatment process. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of the existing technology by providing a wastewater treatment plant chemical dosing system to achieve uniform dosing of wastewater treatment plant chemicals.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a wastewater treatment plant reagent dosing system, comprising a mixing tank, wherein the mixing tank is provided with a reagent addition port and a water addition port, and a discharge port is provided at the bottom of the mixing tank, the discharge port being connected to a conveying pipe, the end of the conveying pipe extending to the top of the reaction tank, and a rotating nozzle being provided at the end of the conveying pipe; a venturi tube is provided on the conveying pipe at the front end of the rotating nozzle, and the throat of the venturi tube is connected to a gas conveying pipe.

[0007] Furthermore, the water inlet is connected to the water supply pipe, and a corresponding control valve and flow indicator are installed on the water supply pipe.

[0008] Furthermore, the drug addition port is connected to a drug delivery pipeline, which is connected to a raw material storage tank. A corresponding delivery pump, control valve, and flow indicator are installed on the drug delivery pipeline.

[0009] Furthermore, the conveying pipeline is equipped with a corresponding conveying pump, control valve, and flow indicator, with the venturi tube located at the rear end of the conveying pump.

[0010] Furthermore, the conveying pipeline is equipped with corresponding control valves and flow indicators.

[0011] Furthermore, the gas transmission pipeline is connected to the aeration pipeline in the plant area.

[0012] Furthermore, each of the drug delivery pipelines is equipped with a filter, which is located at the front end of its respective delivery pump.

[0013] The beneficial effects of this utility model are: simple structure, easy to use, applicable to the uniform addition of various types of agents in the factory area, playing a positive role in ensuring the efficiency of agent addition, and low modification cost, making it easy to use in actual production. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall layout of this utility model;

[0015] Figure 2 This is a top view schematic diagram of the rotating nozzle involved in this utility model.

[0016] The names corresponding to each mark in the diagram:

[0017] 1. Raw material storage tank; 11. First feed inlet; 12. First discharge outlet; 2. First conveying pipeline; 21. First conveying pump; 22. First control valve; 23. First filter; 24. First flow indicator; 3. Mixing tank; 31. Mixing motor; 32. Second feed inlet; 33. Third feed inlet; 34. Second discharge outlet; 4. Second conveying pipeline; 41. Second control valve; 42. Second flow indicator; 5. Third conveying pipeline; 51. Second conveying pump; 52. Third control valve; 53. Second filter; 54. Third flow indicator; 55. Venturi tube; 6. Fourth conveying pipeline; 61. Fourth control valve; 62. Fourth flow indicator; 7. Rotary nozzle. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0019] Embodiments of this utility model:

[0020] like Figure 1-2 As shown, in this embodiment, a mixing tank 3 is provided, and a stirring motor 31 is provided on the mixing tank 3. The stirring motor 31 is connected to the stirring paddle in the tank. A second feed inlet 32 ​​and a third feed inlet 33 are respectively provided on the top of the mixing tank 3. The second feed inlet 32 ​​is connected to the first conveying pipe 2, and the third feed inlet 33 is connected to the second conveying pipe 4. A second discharge outlet 34 is provided at the bottom of the mixing tank 3, and the second discharge outlet 34 is connected to the third conveying pipe 5. In this embodiment, the first conveying pipe 2 is used for conveying the drug solution, the second conveying pipe 4 is used for conveying water, and the third conveying pipe 5 conveys the mixed drug solution to the rear end.

[0021] In this embodiment, a rotary nozzle 7 (commercially available, so it will not be described in detail) is provided at the end of the third delivery pipe 5. A second delivery pump 51, a third control valve 52, and a second filter 53 (such as a Y-type filter) are provided on the third delivery pipe 5. A venturi tube 55 is provided on the third delivery pipe 5 at the rear end of the second delivery pump 51. The throat of the venturi tube 55 is connected to the fourth delivery pipe 6. In this embodiment, the fourth delivery pipe 6 is used for air delivery.

[0022] In one embodiment of this utility model, a first flow indicator 24 is provided on the first conveying pipe 2, and a second flow indicator 42 is provided on the second conveying pipe 4 for metering and adding the drug solution and water, so that the resulting mixed drug solution reaches the concentration required for use; a second control valve 41 is provided on the second conveying pipe 4.

[0023] In one embodiment of this utility model, a third flow indicator 54 is provided on the third conveying pipe 5 for metering and adding the mixed reagent solution; a fourth flow indicator 62 and a fourth control valve 61 are provided on the fourth conveying pipe 6 for regulating the mixing ratio of air and the mixed reagent solution, such as 1L / m 3 The fourth conveying pipeline 6 is connected to the aeration pipeline of the aeration blower in the plant area.

[0024] In one embodiment of this utility model, a raw material storage tank 1 is provided at the front end of the mixing tank 3, a first feed inlet 11 is provided above the raw material storage tank 1, a first discharge outlet 12 is provided below the raw material storage tank 1, the first discharge outlet 12 is connected to the first conveying pipe 2, a first conveying pump 21 is provided on the first conveying pipe 2, and a first control valve 22 and a first filter 23 (Y-type filter, etc.) are provided on the first conveying pipe 2.

[0025] The principle of this utility model is as follows:

[0026] This invention can be used for the addition of various agents in wastewater treatment processes, such as carbon sources, PAM, PAC, polyferric sulfate, and sodium hypochlorite solution; it can achieve uniform addition of various agents, which plays a positive role in improving the uniformity of agent addition and ensuring agent addition efficiency.

[0027] In this invention, the agent is added to the mixing tank 3. It should be noted that the embodiments in the accompanying drawings only show the case where the agent is in liquid form. When the raw agent is in liquid form, the high-concentration raw agent is stored in the raw material storage tank 1. When used, it is transported to the mixing tank 3 at the rear end for further dilution with water before use. When the raw agent is in solid form, the raw material storage tank 1 can be omitted (or the raw material storage tank 1 is a solid storage tank). A certain amount of water is added to the mixing tank 3 first, and then the solid raw material is metered and transported to the mixing tank 3 through a screw conveyor or other means (a solid agent addition port is opened on the mixing tank 3). After being fully dissolved and stirred evenly, it is transported to the rear end.

[0028] Since the amount of each agent added during wastewater treatment is generally small, a certain amount of gas is introduced during the agent delivery process in this invention to ensure stable rotation of the rotary nozzle 7 at the rear end. This ensures stable rotation of the rotary nozzle 7 and, through the Venturi tube 55, fills the agent solution with air bubbles, which is more conducive to agent dispersion. It should be noted that although some agents, such as PAM, cannot be exposed to oxygen for extended periods during wastewater treatment, in this invention, the contact time between the agent and air is very short. Placing the Venturi tube 55 a short distance above the rotary nozzle 7 does not affect actual production use.

[0029] When adding biological agents such as carbon sources, the fourth conveying pipe 6 in this invention can be connected to the aeration pipe, allowing for modification of the existing aeration pipes in the plant area, greatly saving equipment and operating costs. When adding agents such as PAC, if it needs to be added to the high-efficiency sedimentation tank, although the high-efficiency sedimentation tank has an aeration blower, it is basically only used during inclined tube backwashing. The aeration blower has a large power and is not suitable for continuous operation in this invention. Therefore, a small air compressor can be used separately and connected to the fourth conveying pipe 6. This setting can be used for other situations where it is inconvenient to connect to the existing aeration pipes in the plant area. It should be noted that if the amount of agent added is large and sufficient to support the stable rotation of the rotary nozzle 7 during the addition process, such as the addition of sodium hypochlorite when sludge bulking occurs in the biological tank, the fourth aeration pipe can also be directly connected to the air during the process. The air can be drawn in by the venturi tube 55, further ensuring the stable rotation of the rotary nozzle 7 and the uniformity of agent dispersion.

[0030] In this invention, the reagent mixed with air is evenly sprayed into the reaction tank under the action of the rotating nozzle 7, thus enabling faster dispersion and playing a positive role in ensuring the dosing efficiency of the reagent. In order to ensure the stability of the system, for corrosive reagents, appropriate corrosion-resistant pipes must be used. At the same time, a certain degree of redundancy design is necessary, such as setting up backup for each delivery pump, valve and filter.

Claims

1. A sewage treatment plant reagent dosing system comprising a stirred tank, characterised in that: The stirring tank is provided with a medicament adding port and a water adding port, the bottom of the stirring tank is provided with a discharge port, the discharge port is connected with a conveying pipeline, the conveying pipeline extends to the upper side of the reaction tank, and a rotary nozzle is arranged at the end of the conveying pipeline; a Venturi tube is arranged on the conveying pipeline in front of the rotary nozzle, and the throat of the Venturi tube is connected with a gas conveying pipeline.

2. The reagent dosing system for wastewater treatment plant according to claim 1, characterized in that: The water adding port is connected with a water supply pipeline, and a corresponding control valve and a flow indicating instrument are arranged on the water supply pipeline.

3. The reagent dosing system for wastewater treatment plant according to claim 1, characterized in that: The medicament adding port is connected with a medicament conveying pipeline, the medicament conveying pipeline is connected with a raw material storage tank, and a corresponding conveying pump, control valve and flow indicating instrument are arranged on the medicament conveying pipeline.

4. The reagent dosing system for wastewater treatment plant according to claim 3, characterized in that: A corresponding conveying pump, control valve and flow indicating instrument are arranged on the conveying pipeline, and the Venturi tube is located at the rear end of the conveying pump.

5. The reagent dosing system for wastewater treatment plant according to claim 1, characterized in that: A corresponding control valve and flow indicating instrument are arranged on the conveying pipeline.

6. The reagent dosing system for wastewater treatment plant according to claim 5, characterized in that: The gas conveying pipeline is connected with an aeration pipeline in the factory area.

7. The reagent dosing system for wastewater treatment plant according to any one of claims 3-4, characterized in that: A filter is arranged on the medicament conveying pipeline and the conveying pipeline, and the filter is located at the front end of the respective conveying pump.

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