Chemical feeding device for sewage treatment

Abstract

The utility model discloses a dosing device for sewage treatment and purification, including medicine jar, siphon, dosing pipe, jet circulating pipe, venturi, liquid suction pipe, liquid filling pipe, the liquid level of medicine jar is always higher than the liquid level of sewage treatment pond, the import end of siphon is located below the liquid level of medicine jar, and its export end is connected with the import end of dosing pipe, and the export end of dosing pipe is located below the liquid level of sewage treatment pond, the import end of jet circulating pipe is connected on siphon, and its export end is connected with venturi, and venturi is located in medicine jar and above the liquid level of medicine jar, and the import end of liquid suction pipe is located below the liquid level of medicine jar and is located in the lower part of medicine jar, and its export end is connected on venturi, and the import end of liquid filling pipe is connected on medicine jar, and its export end is connected on siphon. Advantages include: no need to set stirring mechanism, utilize siphon action and venturi effect, realize the internal circulation of medicament without additional power, avoid medicament deposition, no mechanical part wear and tear, and maintenance cost reduction.

Description

Technical Field

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

[0002] Wastewater contains a large amount of suspended particulate matter, colloidal substances, and some dissolved organic pollutants that are difficult to settle or filter naturally. To address these pollutants, flocculants are typically added to the wastewater to transform them into easily separable large flocs through physicochemical processes, which are then removed from the wastewater through sedimentation and filtration.

[0003] For flocculants prone to sedimentation, long-term storage in the tank can easily lead to stratification and uneven dosing concentration, affecting the final effect. While traditional stirring mechanisms (such as paddle or frame stirrers) in the tank can temporarily alleviate sedimentation, they present problems such as high energy consumption, damage to reagent properties, complex maintenance, and pollution risks. For example, stirring requires starting a motor, resulting in high electricity costs over the long term; if the tank contains "inorganic + organic composite flocculants" (such as PAC + PAM), the high shear force of traditional stirring mechanisms can directly damage the long-chain structure of organic polymers, leading to a significant decrease in efficacy; flocculants (especially inorganic metal salts) are often corrosive, and some contain tiny solid particles (such as unpolymerized particles in PAC). Particles can cause rapid wear and tear on the mechanical parts of traditional mixing mechanisms; the mechanical gaps in traditional mixing mechanisms can easily trap chemical residues, creating "pollution dead zones," which may introduce additional impurities, especially for industrial wastewater treatment with high requirements (such as food and electronic wastewater). Utility Model Content

[0004] The purpose of this invention is to provide a dosing device for wastewater treatment and purification, in order to solve problems such as easy sedimentation of chemicals in the tank and "dead corners" of the stirring mechanism.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A wastewater treatment and purification dosing device includes a chemical tank, a siphon pipe, a dosing pipe, a jet circulation pipe, a venturi pipe, a liquid extraction pipe, and a liquid filling pipe.

[0007] The liquid level in the medicine tank is always higher than the liquid level in the sewage treatment tank.

[0008] The inlet end of the siphon pipe is located below the liquid level in the medicine tank, and its outlet end is connected to the inlet end of the dosing pipe, the outlet end of which is located below the liquid level in the wastewater treatment tank.

[0009] The inlet end of the jet circulation pipe is connected to the siphon pipe, and its outlet end is connected to the venturi. The venturi is located inside the medicine container and above the liquid surface.

[0010] The inlet of the extraction pipe is located below the liquid level in the medicine tank and at the bottom of the tank, while its outlet is connected to a venturi.

[0011] The inlet end of the filling tube is connected to the medicine container, and its outlet end is connected to the siphon tube.

[0012] Furthermore, the inlet end of the siphon tube is connected to the lower region of the medicine container, and a first siphon tube valve is provided at its inlet end, while a second siphon tube valve is provided at its outlet end.

[0013] Furthermore, the siphon tube is equipped with a siphon tube exhaust valve, and the section between the inlet end of the siphon tube and the siphon tube exhaust valve is an inclined section that slopes upward from the inlet end of the siphon tube toward the siphon tube exhaust valve.

[0014] Furthermore, the jet circulation pipe includes, in sequence along the flow direction, a first inclined section, a second inclined section, and an arc-shaped section. The inlet end of the first inclined section is connected to the middle section of the siphon tube. The first inclined section slopes upward from the siphon tube toward the bottom of the medicine container. The second inclined section penetrates into the inside of the medicine container and slopes upward from the bottom of the medicine container toward the side wall of the medicine container.

[0015] The first inclined section is equipped with a jet circulation pipe shut-off valve and a jet circulation pipe check valve in sequence along the flow direction.

[0016] Furthermore, the venturi includes a contraction section, a throat, and an expansion section. The contraction section is connected to the outlet end of the arc-shaped segment. The inner diameter of the connection end of the contraction section is equal to the inner diameter of the outlet end of the arc-shaped segment. The inner diameter of the throat is smaller than the inner diameter of the connection end of the contraction section. The inner diameter of the outlet end of the expansion section is larger than the inner diameter of the throat. The jet direction of the expansion section is inclined downward and does not directly hit the inner sidewall of the tank closest to it.

[0017] Furthermore, the outlet end of the suction tube is connected to the throat of the venturi.

[0018] Furthermore, the filling pipe includes a horizontal section and an inclined section along the flow direction. The inlet end of the horizontal section is connected to the lower part of the medicine tank, and the inclined section slopes upward along the flow direction. The outlet end of the inclined section is connected to the siphon position corresponding to the siphon exhaust valve. A filling pump, a filling pipe stop valve, a filling pipe check valve, and a filling pipe pressure gauge are sequentially provided on the filling pipe along the flow direction.

[0019] Furthermore, the dosing pipe is equipped with a dosing pipe pressure gauge, a dosing pipe vent valve, and a dosing pipe shut-off valve along the flow direction.

[0020] Furthermore, a sewage pipe is connected to the dosing pipe, and a sewage pipe shut-off valve is provided on the sewage pipe. The angle between the flow direction of the sewage pipe and the flow direction of the dosing pipe is an acute angle.

[0021] Furthermore, the medicine container is shaped like an inverted frustum.

[0022] The advantages of this invention are: it eliminates the need for a stirring mechanism, thus reducing energy consumption. By utilizing the natural negative pressure of the siphon effect and the enhanced suction of the Venturi effect, it achieves internal circulation of the drug without additional power, thereby avoiding drug precipitation and eliminating wear on mechanical parts, significantly reducing maintenance costs. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, do not constitute an undue limitation of the present invention. In the drawings:

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the installation structure of the siphon tube, jet circulation tube, and filling tube;

[0026] Figure 3 This is a top-view schematic diagram of the Venturi jet direction.

[0027] Medicine tank 1, siphon pipe 2, first siphon pipe valve 21, second siphon pipe valve 22, siphon pipe vent valve 23, dosing pipe 3, dosing pipe vent valve 31, dosing pipe shut-off valve 32, jet circulation pipe 4, first inclined section 41, second inclined section 42, arc-shaped section 43, jet circulation pipe shut-off valve 44, jet circulation pipe check valve 45, venturi 5, contraction section 51, throat 52, expansion section 53, liquid extraction pipe 6, filling pipe 7, filling pipe horizontal section 71, filling pipe inclined section 72, filling pump 73, filling pipe shut-off valve 74, filling pipe check valve 75, sewage treatment tank 8, sewage pipe 9, sewage pipe shut-off valve 91. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0029] like Figure 1-3 As shown, a wastewater treatment and purification dosing device includes a chemical tank 1, a siphon pipe 2, a dosing pipe 3, a jet circulation pipe 4, a venturi pipe 5, a suction pipe 6, and a filling pipe 7.

[0030] The liquid level in the medicine tank 1 is always higher than the liquid level in the sewage treatment tank 8.

[0031] The inlet end of the siphon pipe 2 is below the liquid surface of the medicine tank 1, and its outlet end is connected to the inlet end of the dosing pipe 3. The outlet end of the dosing pipe 3 is below the liquid surface of the sewage treatment tank 8.

[0032] The inlet end of the jet circulation pipe 4 is connected to the siphon pipe 2, and its outlet end is connected to the venturi 5. The venturi 5 is located inside the medicine tank 1 and above the liquid surface in the medicine tank 1.

[0033] The inlet end of the liquid extraction pipe 6 is located below the liquid surface of the medicine tank 1 and at the bottom of the medicine tank 1, and its outlet end is connected to the Venturi 5.

[0034] The inlet end of the filling tube 7 is connected to the medicine tank 1, and its outlet end is connected to the siphon tube 2.

[0035] The inlet end of the siphon tube 2 is connected to the lower area of ​​the medicine tank 1, and a first siphon tube valve 21 is provided at its inlet end, while a second siphon tube valve 22 is provided at its outlet end.

[0036] The siphon pipe 2 is equipped with a siphon pipe exhaust valve 23. The pipe section between the inlet end of the siphon pipe 2 and the siphon pipe exhaust valve 23 is an inclined pipe section, which is inclined upward from the inlet end of the siphon pipe 2 towards the siphon pipe exhaust valve 23.

[0037] The jet circulation pipe 4 includes, in sequence along the flow direction, a first inclined section 41, a second inclined section 42, and an arc-shaped section 43. The inlet end of the first inclined section 41 is connected to the middle section of the siphon pipe 2. The first inclined section 41 slopes upward from the siphon pipe 2 toward the bottom of the medicine container 1. The second inclined section 42 penetrates into the inside of the medicine container 1 and slopes upward from the bottom of the medicine container 1 toward the side wall of the medicine container 1.

[0038] The first inclined section 41 is provided with a jet circulation pipe shut-off valve 44 and a jet circulation pipe check valve 45 in sequence along the flow direction.

[0039] The venturi 5 includes a contraction section 51, a throat 52, and an expansion section 53. The contraction section 51 is connected to the outlet end of the arc-shaped segment 43, and the inner diameter of the connecting end of the contraction section 51 is equal to the inner diameter of the outlet end of the arc-shaped segment 43. The inner diameter of the throat 52 is smaller than the inner diameter of the connecting end of the contraction section 51, and the inner diameter of the outlet end of the expansion section 53 is larger than the inner diameter of the throat 52. The jet direction of the expansion section 53 is inclined downward and does not directly hit the nearest inner wall of the tank, ensuring that the agent can flow downward along the inclined tank wall. Non-vertical impact to the tank wall avoids turbulence caused by impact rebound.

[0040] The outlet end of the extraction tube 6 is connected to the throat 52 of the venturi 5.

[0041] The filling pipe 7 includes a horizontal section 71 and an inclined section 72 along the flow direction. The inlet end of the horizontal section 71 is connected to the lower part of the medicine tank 1. The inclined section 72 is inclined upward along the flow direction. The outlet end of the inclined section 72 is connected to the siphon pipe 2 position corresponding to the siphon pipe exhaust valve 23. The filling pipe 7 is equipped with a filling pump 73, a filling pipe stop valve 74, a filling pipe check valve 75, and a filling pipe pressure gauge along the flow direction.

[0042] The dosing pipe 3 is equipped with a dosing pipe pressure gauge, a dosing pipe exhaust valve 31, and a dosing pipe shut-off valve 32 along the flow direction.

[0043] The dosing pipe 3 is connected to a sewage pipe 9, and the sewage pipe 9 is equipped with a sewage pipe shut-off valve 91. The angle between the flow direction of the sewage pipe 9 and the flow direction of the dosing pipe 3 is an acute angle.

[0044] The medicine container 1 is shaped like an inverted frustum.

[0045] The working process of this utility model is as follows:

[0046] Before startup, air is present in siphon tube 2, which needs to be expelled to fill it with liquid. Close the first siphon tube valve 21, the second siphon tube valve 22, the dosing pipe shut-off valve 32, and the jet circulation pipe shut-off valve 44. Open the siphon tube vent valve 23, the dosing pipe vent valve 31, and the filling pipe shut-off valve 74. Start the filling pump 73. The medicine in the medicine tank 1 gradually enters the filling siphon tube 2 through the filling pipe 7, while simultaneously expelling the air in siphon tube 2 through the siphon tube vent valve 23, filling siphon tube 2 with medicine. At the same time, sewage flows from the sewage pipe 9 into the dosing pipe 3, and the air in the dosing pipe 3 is expelled through the dosing pipe vent valve 31, filling the dosing pipe 3 with sewage. When there are no more air bubbles in the siphon tube vent valve 23 and the dosing pipe vent valve 31, and the medicine flows out steadily, the pre-filling is complete. Next, close the siphon tube vent valve 23 and the dosing tube vent valve 31, and continue to inject the agent into the pipeline to raise the pressure of the filling tube 7 and the dosing tube 3 to 0.05-0.1 MPa, and maintain this pressure for 3-5 minutes.

[0047] Then, shut off the filling pump 73, the filling pipe shut-off valve 74, and the sewage pipe shut-off valve 91, and open the first siphon valve 21, the second siphon valve 22, the dosing pipe shut-off valve 32, and the jet circulation pipe shut-off valve 44. At this time, due to the liquid level difference between the liquid in the medicine tank 1 and the liquid in the sewage treatment tank 8, and because the siphon pipe 2 and the dosing pipe 3 are completely filled with liquid and sealed without leakage, the agent in the high-level medicine tank 1 flows to the low-level sewage treatment tank 8 under the action of atmospheric pressure and gravity, and the liquid flow velocity in the siphon pipe 2 gradually increases. During the liquid flow, a negative pressure environment (pressure lower than the external atmospheric pressure) is formed in the siphon pipe 2. The external atmospheric pressure will "push" the agent in the medicine tank 1 to continuously replenish the siphon pipe 2, forming a "self-driven" siphon flow that runs continuously without additional power.

[0048] During this process, after opening the sewage pipe shut-off valve 91, most of the agent enters the dosing pipe 3 from the siphon pipe 2 and mixes with the sewage before entering the sewage treatment tank 8. A small portion of the agent is diverted into the jet circulation pipe 4. When this small portion of the agent passes through the throat 52 of the venturi 5, the flow velocity increases sharply, creating a local negative pressure and exerting a strong suction effect. This "draws" the high-concentration agent from the lower part of the tank 1 into the venturi 5, where it mixes with the agent from the jet circulation pipe 4. After the pressure is restored in the expansion section 53, the agent is then tilted downwards and obliquely sprayed onto the inner wall of the tank 1. The agent flows naturally along the inclined side wall towards the bottom center and is guided by gravity and the wall surface to form a "film-like flow along the wall," covering most of the tank wall area. There is no direct spraying to the bottom of the tank or splashing, avoiding the local agent accumulation caused by traditional "direct spraying." Directly spraying towards the center of the tank may create a vortex dead zone. As the agent naturally converges towards the center of the tank bottom, it gradually mixes with the original agent inside, resulting in a wider diffusion range than direct injection. This creates a "bottom → top → sinking" convection cycle with the original agent, which, combined with the suction from the extraction pipe 6, forms a spiral flow field within the tank (simulating a stirring effect). This ensures the agent remains in a flowing state, preventing particle sedimentation and achieving internal circulation mixing of the upper and lower layers of agent within the tank without additional power, thus avoiding any impact on the agent concentration.

[0049] The technical solutions provided by the embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the embodiments of this utility model. The description of the above embodiments is only for helping to understand the principles of the embodiments of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the embodiments of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A dosing device for wastewater treatment and purification, comprising a chemical tank, characterized in that, It also includes siphon tubes, dosing tubes, jet circulation tubes, venturi tubes, suction tubes, and filling tubes. The liquid level in the medicine tank is always higher than the liquid level in the sewage treatment tank. The inlet end of the siphon pipe is located below the liquid level in the medicine tank, and its outlet end is connected to the inlet end of the dosing pipe, the outlet end of which is located below the liquid level in the wastewater treatment tank. The inlet end of the jet circulation pipe is connected to the siphon pipe, and its outlet end is connected to the venturi. The venturi is located inside the medicine container and above the liquid surface. The inlet of the extraction pipe is located below the liquid level in the medicine tank and at the bottom of the tank, while its outlet is connected to a venturi. The inlet end of the filling tube is connected to the medicine container, and its outlet end is connected to the siphon tube.

2. The wastewater treatment and purification dosing device according to claim 1, characterized in that, The inlet end of the siphon tube is connected to the lower area of ​​the medicine container, and a first siphon tube valve is provided at its inlet end, while a second siphon tube valve is provided at its outlet end.

3. The wastewater treatment and purification dosing device according to claim 2, characterized in that, The siphon tube is equipped with a siphon tube exhaust valve. The section between the inlet end of the siphon tube and the siphon tube exhaust valve is an inclined section that slopes upward from the inlet end of the siphon tube toward the siphon tube exhaust valve.

4. The wastewater treatment and purification dosing device according to claim 3, characterized in that, The jet circulation pipe includes, in sequence along the flow direction, a first inclined section, a second inclined section, and an arc-shaped section. The inlet end of the first inclined section is connected to the middle section of the siphon tube. The first inclined section slopes upward from the siphon tube toward the bottom of the medicine container. The second inclined section penetrates into the inside of the medicine container and slopes upward from the bottom of the medicine container toward the side wall of the medicine container. The first inclined section is equipped with a jet circulation pipe shut-off valve and a jet circulation pipe check valve in sequence along the flow direction.

5. The wastewater treatment and purification dosing device according to claim 4, characterized in that, The venturi includes a contraction section, a throat, and an expansion section. The contraction section is connected to the outlet end of the arc-shaped segment. The inner diameter of the connection end of the contraction section is equal to the inner diameter of the outlet end of the arc-shaped segment. The inner diameter of the throat is smaller than the inner diameter of the connection end of the contraction section. The inner diameter of the outlet end of the expansion section is larger than the inner diameter of the throat. The jet direction of the expansion section is inclined downward and does not directly hit the inner sidewall of the tank closest to it.

6. The wastewater treatment and purification dosing device according to claim 5, characterized in that, The outlet end of the suction tube is connected to the throat of the venturi.

7. The wastewater treatment and purification dosing device according to claim 3, characterized in that, The filling pipe includes a horizontal section and an inclined section along the flow direction. The inlet end of the horizontal section is connected to the lower part of the medicine tank. The inclined section slopes upward along the flow direction. The outlet end of the inclined section is connected to the siphon position corresponding to the siphon exhaust valve. A filling pump, a filling pipe stop valve, a filling pipe check valve, and a filling pipe pressure gauge are installed along the flow direction on the filling pipe in sequence.

8. The wastewater treatment and purification dosing device according to claim 1, characterized in that, The dosing pipe is equipped with a dosing pipe pressure gauge, a dosing pipe vent valve, and a dosing pipe shut-off valve along the flow direction.

9. The wastewater treatment and purification dosing device according to claim 8, characterized in that, The dosing pipe is connected to a sewage pipe, which is equipped with a sewage pipe shut-off valve. The angle between the flow direction of the sewage pipe and the flow direction of the dosing pipe is an acute angle.

10. The wastewater treatment and purification dosing device according to claim 1, characterized in that, The medicine container is shaped like an inverted frustum.

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