Sewage treatment tank based on air floatation treatment

Abstract

The application discloses a sewage treatment tank based on air floatation treatment, which comprises an air floatation tank, a dissolving gas pipe, a drainage tank, a water collecting pipe, an oxidant pipe and a drainage pipe. The dissolving gas pipe is arranged in the air floatation tank. The drainage tank is arranged on the side of the air floatation tank. The water collecting pipe is arranged between the drainage tank and the air floatation tank. The oxidant pipe is connected with the drainage tank. The drainage pipe is connected with the drainage tank. The activated carbon filter is connected with the drainage pipe. The dissolving gas water enters the air floatation tank through the dissolving gas pipe, and the sewage in the air floatation tank is treated by air floatation. After the treatment by the air floatation unit, the turbidity of the effluent is reduced to below 3-5 NTU, and the algae removal rate reaches 85%-95%. The oxidant solution can kill the precipitates and pathogenic microorganisms in the sewage, oxidatively degrade organic pollutants such as algal toxins, and the activated carbon adsorption unit can adsorb and remove residual oxidants and trace organic matters. After the treatment, the indexes of the water quality can reach the national standard of the sanitary standard for drinking water.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and in particular to a wastewater treatment tank based on air flotation. Background Technology

[0002] Approximately 25% of my country's drinking water sources are from lakes or river reservoirs. Wastewater from water treatment plants contains large amounts of organic matter, micro-pollutants, and mineral deposits, which are difficult to treat effectively using traditional methods. In particular, the traditional chlorination process often produces byproducts such as trihalomethanes, which can endanger human health.

[0003] Furthermore, existing wastewater treatment facilities and technologies are ineffective in addressing water pollution.

[0004] Therefore, it is necessary to propose a wastewater treatment pond based on air flotation to effectively solve water pollution, which has become an important technical problem that urgently needs to be solved. Utility Model Content

[0005] This application provides a wastewater treatment tank based on air flotation, which aims to solve the problem that existing wastewater treatment facilities and technologies cannot effectively solve water pollution.

[0006] To achieve the above objectives, this application proposes a wastewater treatment tank based on dissolved air flotation (DAF), comprising: a DAF tank; a dissolved air pipe installed inside the DAF tank; a drainage tank located on the side of the DAF tank; a water collection pipe connecting the drainage tank and the DAF tank; an oxidant pipe connected to the drainage tank; a drainage pipe connected to the drainage tank; and an activated carbon filter connected to the activated carbon filter.

[0007] In some embodiments, the system further includes: an intermediate flange, wherein the water collection pipe is provided with an intermediate flange; a connecting flange, wherein the connecting flange is connected to the intermediate flange; and a filter cartridge, wherein the filter cartridge is connected to the connecting flange, and a section of the water collection pipe is provided with water permeable holes.

[0008] In some embodiments, the system further includes a seal, wherein the seal is disposed between the intermediate flange and the connecting flange.

[0009] In some embodiments, the system further includes an inlet pipe disposed in the flotation tank.

[0010] In some embodiments, the system further includes: a sedimentation zone, wherein a sedimentation zone is provided within the flotation tank; and a sludge discharge pipe, wherein the sludge discharge pipe is provided in the flotation tank and is located in the sedimentation zone.

[0011] In some embodiments, the system further includes: a gas dissolving tank connected to a gas dissolving pipe; and a gas dissolving pump, one end of which is connected to the gas dissolving tank and the other end of which is connected to a drainage tank.

[0012] This application proposes a wastewater treatment tank based on dissolved air flotation (DAF), comprising: a DAF tank; a dissolved air pipe installed inside the DAF tank; a drainage tank located on the side of the DAF tank; a collection pipe connecting the drainage tank and the DAF tank; an oxidant pipe connected to the drainage tank; a drainage pipe connected to the drainage tank; and an activated carbon filter connected to the activated carbon filter. Dissolved air water enters the DAF tank through the dissolved air pipe to treat the wastewater within the tank using DAF. After treatment by the DAF unit, the turbidity of the effluent is reduced to below 3–5 NTU, and the algae removal rate reaches 85%–95%. An oxidant solution prepared by a hydroxyl radical generator is injected into the drainage tank through the oxidant pipe to rapidly kill sediments and pathogenic microorganisms in the wastewater, oxidize and degrade organic pollutants such as algal toxins, and purify the water. The remaining ·OH radicals decompose into O2 and H2O. The treated water can be used as non-potable drinking water. The activated carbon adsorption unit adsorbs and removes residual oxidants and trace organic matter, and the treated water meets the national "Standards for Drinking Water Quality". Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a front view of a wastewater treatment tank based on air flotation in one embodiment of this application; Figure 2 for Figure 1 Enlarged view of a section in the middle C; Figure 3 for Figure 1 A magnified view of a section in part D; Figure 4 for Figure 1 Cross-sectional view of the middle AA section; Figure 5 for Figure 1 Cross-sectional structural diagram of the middle BB section.

[0014] In the diagram: 1. Flotation tank; 2. Dissolved air pipe; 3. Water collection pipe; 4. Filter cartridge; 5. Sedimentation zone; 6. Sludge discharge pipe; 7. Fifth solenoid valve; 8. Dissolved air tank; 9. Drainage tank; 10. Oxidant pipe; 11. Third solenoid valve; 12. Dissolved air pump; 13. Sixth solenoid valve; 14. Seventh solenoid valve; 15. Inlet pipe; 16. Intermediate flange; 18. Seal; 19. Connecting flange; 20. Drainage pipe; 21. Activated carbon filter; 22. Second solenoid valve; 23. First solenoid valve. Detailed Implementation

[0015] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0016] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0017] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0018] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0019] See Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, this application proposes a wastewater treatment tank based on air flotation, comprising: an air flotation tank 1; a dissolved air pipe 2, which is installed inside the air flotation tank 1; a drainage tank 9, which is located on the side of the air flotation tank 1; a water collection pipe 3, which connects the drainage tank 9 and the air flotation tank 1; an oxidant pipe 10, which connects to the drainage tank 9; a drainage pipe 20, which connects to the drainage tank 9; and an activated carbon filter 21, which connects to the activated carbon filter 21.

[0020] The dissolved air flotation (DAF) tank 1 is the structural foundation of a wastewater treatment tank based on DAF treatment. All other structures in the wastewater treatment tank based on DAF treatment are directly or indirectly installed on the DAF tank 1. Dissolved air water, containing a large number of microbubbles, enters the DAF tank 1 through the dissolved air pipe 2. The microbubbles slowly rise and adhere to impurity particles, forming floats with a density less than water. These float to the surface, forming scum, which is then removed by a scum scraper. Clean water is discharged through the collection pipe 3, thus completing the DAF process. The scum scraper is a mature existing technology, and its specific structure is not specified here.

[0021] In this embodiment, multiple water collection pipes 3 are provided, and each water collection pipe 3 is equipped with a first solenoid valve 23 at its end located in the drainage pool 9. The discharge of clean water can be adjusted by the first solenoid valve 23.

[0022] The oxidant pipe 10 is used to introduce an oxidant solution containing hydroxyl radicals into the drainage tank 9. The oxidant solution rapidly kills sediments and pathogenic microorganisms in the sewage on a large scale, oxidizes and degrades organic pollutants such as algal toxins, and purifies the water. The remaining ·OH decomposes into O2 and H2O, which can be used as non-potable domestic water. The activated carbon filter 21 adsorbs and removes residual oxidant solution and trace organic matter, and the water quality indicators after treatment meet the national "Standards for Drinking Water Quality" (GB5749-2006).

[0023] Specifically, dissolved air water enters the flotation tank 1 through dissolved air pipe 2, treating the wastewater in the flotation tank 1 with flotation. After treatment by the flotation unit, the turbidity of the effluent is reduced to below 3-5 NTU, and the algae removal rate reaches 85%-95%. The oxidant solution prepared by the hydroxyl radical generator is injected into the drainage tank 9 through the oxidant pipe 10 to rapidly kill sediments and pathogenic microorganisms in the wastewater, oxidize and degrade organic pollutants such as algal toxins, and purify the water. The remaining ·OH is decomposed into O2 and H2O. This water can be used as non-potable drinking water. The activated carbon adsorption unit adsorbs and removes residual oxidant and trace organic matter, ensuring that all indicators of the treated water meet the national "Standards for Drinking Water Quality".

[0024] Both the dissolved air flotation tank 1 and the drainage tank 9 are constructed of reinforced concrete, which possesses excellent mechanical properties and corrosion resistance. The dissolved air pipe 2 is pre-embedded in the dissolved air flotation tank 1, and the water collection pipe 3 is pre-embedded in the dissolved air flotation tank 1, with a portion located within the drainage tank 9. The drainage pipe 20 is pre-embedded in the drainage tank 9.

[0025] The drain pipe 20 is equipped with a second solenoid valve 22 to control the discharge of clean water. The oxidant pipe 10 is equipped with a third solenoid valve 11 to control the discharge of the oxidant solution.

[0026] See Figure 1 and Figure 2 As shown, in some embodiments, the system further includes: an intermediate flange 16, with the water collection pipe 3 equipped with an intermediate flange 16; the intermediate flange 16 is located inside the flotation tank 1, and a connecting flange 19 is connected to the intermediate flange 16; both the connecting flange 19 and the intermediate flange 16 have corresponding connecting holes, and the connection between the connecting flange 19 and the intermediate flange 16 is achieved by bolts and lock nuts. A filter cartridge 4 is connected to the connecting flange 19 and welded to it. A section of the water collection pipe 3 has permeable holes; the water collection pipe 3 has permeable holes on one side of the intermediate flange 16, but not on the other side. The filter cartridge 4 is installed on the outer side of the section of the water collection pipe 3 with permeable holes. The filter cartridge 4 mechanically filters the wastewater, reducing the turbidity to 1 NTU. When the filter cartridge 4 becomes clogged, it can be disassembled for cleaning, improving its usability.

[0027] See Figure 1 and Figure 2 As shown, in some embodiments, a sealing element 18 is further included, which is disposed between the intermediate flange 16 and the connecting flange 19. The sealing element 18 is a sealing ring, which improves the sealing performance between the intermediate flange 16 and the connecting flange 19, preventing sewage from entering the drainage tank 9 without mechanical filtration.

[0028] See Figure 1 , Figure 4 and Figure 5 As shown, in some embodiments, it further includes: an inlet pipe 15, which is disposed in the flotation tank 1. The inlet pipe 15 is used to continuously discharge sewage, and a seventh solenoid valve 14 is disposed on the inlet pipe 15 to control the discharge of sewage.

[0029] See Figure 1 , Figure 4 and Figure 5 As shown, in some embodiments, the system further includes: a sedimentation zone 5, which is provided within the flotation tank 1; the cross-sectional area of ​​the sedimentation zone 5 gradually decreases with increasing depth, allowing some pollutants to settle to the bottom of the flotation tank 1 and enter the sedimentation zone 5; and a sludge discharge pipe 6, which is located within the flotation tank 1 and situated in the sedimentation zone 5. The pollutants settled in the sedimentation zone 5 are discharged through the sludge discharge pipe 6, facilitating subsequent utilization of the pollutants.

[0030] In this embodiment, a fifth solenoid valve 7 is installed on the sludge discharge pipe 6 to control the discharge of pollutant sediment. The sludge discharge pipe 6 is pre-embedded in the flotation tank 1.

[0031] See Figure 1 , Figure 4 and Figure 5As shown, in some embodiments, the system further includes: a dissolved air tank 8 connected to a dissolved air pipe 2; and a dissolved air pump 12, one end of which is connected to the dissolved air tank 8, and the other end of which is connected to a drainage tank 9. The dissolved air pump 12 is a vortex pump or a gas-liquid multiphase pump. At the inlet of the dissolved air pump 12, backflow water and air enter the housing of the pump 12 together. The high-speed rotating impeller cuts the intake air into small bubbles multiple times. These small bubbles rapidly dissolve in the water under the high-pressure environment inside the pump 12 housing, forming dissolved air water, which is then stored in the dissolved air tank 8 and enters the flotation tank 1 through the dissolved air pipe 2 to complete the flotation process. The bubble diameter generated by the dissolved air pump 12 is generally 20–40 μm, the maximum solubility of the intake air reaches 100%, and the maximum gas content in the dissolved air water reaches 30%. A sixth solenoid valve 13 is installed between the dissolved air tank 8 and the dissolved air pipe 2 to control the discharge of the dissolved air water.

[0032] The above description is only a part or preferred embodiment of this application. Neither the text nor the drawings should limit the scope of protection of this application. All equivalent structural transformations made using the content of this application's specification and drawings under the overall concept of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. A wastewater treatment tank based on air flotation, characterized in that, include: Air flotation tank (1); Dissolved air pipe (2), the dissolved air pipe (2) is installed in the air flotation tank (1); A drainage pool (9) is provided on the side of the flotation tank (1); The drainage tank (9) and the flotation tank (1) are connected by the water collection pipe (3); Oxidizing agent pipe (10), which is connected to the drainage pool (9); Drainage pipe (20), the drainage pipe (20) is connected to the drainage pool (9); Activated carbon filter (21), the drain pipe (20) is connected to the activated carbon filter (21); Also includes: Gas dissolving tank (8), the gas dissolving tank (8) is connected to the gas dissolving pipe (2); Dissolved gas pump (12), one end of which is connected to the dissolved gas tank (8), and the other end of which is connected to the drainage pool (9). Also includes: Intermediate flange (16), the water collection pipe (3) is provided with the intermediate flange (16); Connecting flange (19), which is connected to the intermediate flange (16). The filter cartridge (4) is connected to the connecting flange (19), and a section of the water collection pipe (3) is provided with water-permeable holes.

2. A wastewater treatment tank based on air flotation according to claim 1, characterized in that, Also includes: A seal (18) is provided between the intermediate flange (16) and the connecting flange (19).

3. A wastewater treatment tank based on air flotation according to claim 1, characterized in that, Also includes: Water inlet pipe (15) is installed in the flotation tank (1).

4. A wastewater treatment tank based on air flotation according to claim 1, characterized in that, Also includes: Sedimentation zone (5), the sedimentation zone (5) is set in the flotation tank (1); Sludge discharge pipe (6) is installed in the flotation tank (1) and is located in the sedimentation zone (5).

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