Pretreatment device for sewage treatment

Abstract

The utility model discloses a pretreatment device for sewage treatment relates to sewage treatment technical field. The utility model discloses a gas floatation tank, one side of gas floatation tank is provided with dissolved air flocculation mechanism, and the gas floatation tank inner chamber is provided with the impurity removal mechanism. The utility model dissolved air flocculation mechanism passes through the turbulence effect of guide vane in flocculation pipe, makes the full mixing of sewage and reagent to form floc, and can high -efficient adsorption emulsified oil and colloidal particle in combination with the micro -bubble that saturated dissolved air water produced by dissolved air tank is released through cyclone release ware, solve the problem of emulsified oil, colloid separation efficiency deficiency, improve the pollutant removal rate of pretreatment stage, through the mode of flocculation and air floatation, need not rely on the slow process of biological degradation, and the response to water quality fluctuation is more rapid, make up the defect of slow response of relying on single path biological degradation, shorten the pretreatment reaction time, and micro -bubble and flocculation package organic matter, and the improvement of the biodegradability after air floatation improves the utilization rate of carbon source.

Description

Technical Field

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

[0002] In wastewater treatment processes, the pretreatment stage has a decisive impact on the efficiency of subsequent biochemical treatment units. Traditional wastewater pretreatment devices mainly undertake the functions of water quality and quantity adjustment, suspended solids filtration and sedimentation, but their ability to degrade organic pollutants is limited. In particular, for wastewater containing large molecular organic matter and recalcitrant substances, traditional pretreatment units cannot effectively decompose such pollutants, leading to increased load and reduced efficiency in subsequent biochemical treatment.

[0003] Chinese patent application CN221565915U discloses a wastewater pretreatment device, including a main body and a partition disposed within the main body. The partition divides the internal space of the circular shell into a relatively independent but interconnected adjustment area and a hydrolysis reaction area. The adjustment area includes a filtration area and a water storage area surrounding the filtration area. The filtration area includes a pre-filtration area and a post-filtration area. An inlet pipe for conveying wastewater is connected to one side of the pre-filtration area. The inlet pipe passes through the water storage area and connects to the pre-filtration area. A pressurization mechanism is provided on the side of the pre-filtration area facing the hydrolysis reaction area. The pressurization mechanism is used to transfer the wastewater adjusted in the adjustment area to the hydrolysis reaction area so that the anaerobic environment of the hydrolysis reaction area can hydrolyze the wastewater.

[0004] Although the patented technology uses multi-stage filters to intercept solid impurities and remove some suspended solids, it is not efficient enough in separating emulsified oils, colloids and dissolved organic matter. This results in low utilization of carbon sources for subsequent biochemical denitrification and slow response due to the reliance on a single biodegradation pathway. In addition, the filters are easily clogged by fibrous impurities, requiring frequent maintenance and affecting the stability of continuous operation.

[0005] To address these issues, we provide a pretreatment device for wastewater treatment. Utility Model Content

[0006] The purpose of this invention is to provide a pretreatment device for wastewater treatment. By combining a dissolved air flocculation mechanism and a filtration mechanism, it solves the problems of low efficiency and poor filtration effect in existing wastewater treatment pretreatment devices.

[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution.

[0008] This utility model relates to a pretreatment device for wastewater treatment, comprising an air flotation tank. A dissolved air flocculation mechanism is installed on one side of the air flotation tank, and a debris removal mechanism is installed inside the tank. The dissolved air flocculation mechanism includes a water pipe located on one side of the air flotation tank. A water pump is fixedly connected to the surface of the water pipe, and a flocculation pipe is fixedly connected to the other side of the water pipe. The surface of the flocculation pipe is fixedly connected to the air flotation tank, and a guide plate is fixedly connected to the inner cavity of the flocculation pipe. The bottom of the flocculation pipe is fixedly connected to the air flotation tank via a fitting. A dissolved air tank is fixedly connected to the bottom of the air flotation tank, and one side of the dissolved air tank is fixed via a fitting. The system is equipped with multiple cyclone releasers, which are fixedly connected to the bottom of the flotation tank. These cyclone releasers are evenly distributed at the bottom of the flotation tank, allowing microbubbles to form a full coverage within the tank. This avoids insufficient floc separation caused by sparse bubbles in local areas, ensuring that wastewater in all areas of the tank can come into contact with a sufficient number of microbubbles, thus improving the overall pollutant flotation efficiency. The guide plate is spiral-shaped, which can enhance the axial propulsion of the water flow while strengthening the radial mixing of the agent and wastewater through centrifugal force. This allows the flocculant to form a three-dimensional diffusion in the wastewater, avoiding uneven concentration in certain areas.

[0009] The present invention is further configured such that the impurity removal mechanism includes a first motor, one side of which is fixedly connected to the flotation tank. The output end of the first motor passes through one side of the flotation tank and is fixedly connected to a drive sprocket. A chain is meshed on the surface of the drive sprocket, and a driven sprocket is meshed on the other side of the inner cavity of the chain. One side of the driven sprocket is rotatably connected to the flotation tank. A scraper is fixedly connected to one side of the chain. A spiral blade is provided at the bottom of the scraper. A second motor is fixedly connected to one side of the spiral blade. One side of the second motor is fixedly connected to the flotation tank. The scraper is multiple and made of corrosion-resistant stainless steel, which can simultaneously cover different areas of the flotation tank surface, avoiding the problem of scum residue caused by the limited coverage of a single scraper, and avoiding the problem of long-term corrosion of the scraper by acidic and alkaline substances, chloride ions and organic matter in the sewage, which can easily cause deformation. A plastic scraper is provided at the bottom, which can closely adhere to the water surface without damaging the scum layer.

[0010] The present invention is further configured such that a dosing pipe is provided on one side of the water pipe, and the bottom of the dosing pipe is fixedly connected to the flocculation pipe. The dosing pipe allows the agent to be injected synchronously in the initial stage of the sewage entering the flocculation pipe, ensuring that the agent and the sewage come into rapid contact before entering the mixing area of ​​the spiral guide plate, and avoiding the agent from being retained in the water pipe in advance, resulting in excessively high local concentration or ineffectiveness.

[0011] The present invention is further configured such that air inlet pipes are provided on both sides of the bottom of the flotation tank, one side of which is fixedly connected to the dissolved air tank, and the dissolved air tank is connected to the air compressor and the water source respectively through the air inlet pipes on both sides, so as to facilitate the adjustment of the air intake and the water volume according to the dissolved air requirements.

[0012] The present invention is further configured such that a housing is provided on the surface of the second motor, one side of which is fixedly connected to the air flotation tank, and the housing can provide a certain degree of protection for the second motor.

[0013] The present invention is further configured such that a collection box is provided on one side of the scraper, and one side of the collection box is fixedly connected to the flotation tank. The collection box is used to collect the impurities scraped off by the scraper.

[0014] The present invention is further configured such that a movable door is hinged to the other side of the collection box, and a handle is fixedly connected to one side of the movable door, so that the staff can handle the impurities in the collection box by opening the movable door.

[0015] The present invention is further provided that an inclined plate is provided at the bottom of the other side of the movable door, and one side of the inclined plate is fixedly connected to the collection box. The inclined plate guides the impurities to flow in a directional manner by means of gravity, which can prevent impurities from forming dead corners in the collection box and ensure that all impurities in the collection box can converge towards the movable door.

[0016] The present invention has the following beneficial effects.

[0017] 1. This utility model's dissolved air flocculation mechanism utilizes the turbulence effect of the guide plate inside the flocculation tube to ensure thorough mixing of wastewater and chemicals, forming flocs. Combined with the microbubbles released by the saturated dissolved air water generated by the dissolved air tank via the cyclone releaser, it can efficiently adsorb emulsified oil and colloidal particles, solving the problem of insufficient separation efficiency for emulsified oil and colloids, and improving the pollutant removal rate in the pretreatment stage. Furthermore, by using flocculation combined with air flotation, it does not rely on the slow process of biodegradation, and responds more rapidly to water quality fluctuations, making up for the slow response of relying on the single biodegradation path, shortening the pretreatment reaction time. Moreover, the synergistic effect of microbubbles and flocculation can encapsulate some dissolved organic matter in the flocs. After air flotation separation, the proportion of biodegradable organic matter in the remaining wastewater is increased. At the same time, it avoids interference from oily substances on the subsequent biological system, solving the problem of low carbon source utilization rate in subsequent biological denitrification.

[0018] 2. The impurity removal mechanism of this utility model forms a two-dimensional impurity removal system of top scraping and bottom conveying through a scraper driven by a sprocket and chain and a shaftless spiral blade. The scraper, driven by the first motor, moves in a circular motion with the chain and can specifically scrape off the scum on the surface of the flotation tank, avoiding the accumulation of impurities at the top that affects the flotation separation efficiency. The shaftless spiral blade, driven by the second motor, is specifically used to convey the heavy solid impurities deposited at the bottom of the tank, solving the problem that traditional single filtration methods cannot handle impurities in different states at the top and bottom at the same time, and realizing the all-round removal of impurities in the pretreatment stage. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0020] Figure 1 This is a three-dimensional view of a pretreatment device for wastewater treatment.

[0021] Figure 2 This is a three-dimensional diagram of the dissolved air flocculation mechanism in a pretreatment device for wastewater treatment.

[0022] Figure 3 This is a three-dimensional view of the impurity removal mechanism in a pretreatment device for wastewater treatment.

[0023] Figure 4 This is a diagram of a collection box in a pretreatment device for wastewater treatment.

[0024] In the attached diagram: 1. Flotation tank; 2. Dissolved air flocculation mechanism; 201. Water pipe; 202. Water pump; 203. Flocculation pipe; 204. Guide plate; 205. Dissolved air tank; 206. Cyclone release device; 3. Impurity removal mechanism; 301. First motor; 302. Drive sprocket; 303. Chain; 304. Driven sprocket; 305. Scraper; 306. Spiral blade; 307. Second motor; 4. Dosing pipe; 5. Air inlet pipe; 6. Shell; 7. Collection box; 8. Movable door; 9. Handle; 10. Inclined plate. Detailed Implementation

[0025] The technical solutions of the present utility model will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] Example 1

[0027] Please see Figure 1-4 This utility model is a pretreatment device for sewage treatment, including an air flotation tank 1. A dissolved air flocculation mechanism 2 is provided on one side of the air flotation tank 1, and a dirt removal mechanism 3 is provided in the inner cavity of the air flotation tank 1. The dissolved air flocculation mechanism 2 includes a water pipe 201, which is located on one side of the air flotation tank 1. A water pump 202 is fixedly connected to the surface of the water pipe 201. A flocculation pipe 203 is fixedly connected to the other side of the water pipe 201. The surface of the flocculation pipe 203 is fixedly connected to the air flotation tank 1. A guide plate 204 is fixedly connected to the inner cavity of the flocculation pipe 203. The bottom of the flocculation pipe 203 is fixedly connected to the air flotation tank 1 through a pipe fitting. A dissolved air tank 205 is fixedly connected to the bottom of the air flotation tank 1. A cyclone releaser 206 is fixedly connected to one side of the dissolved air tank 205 through a pipe fitting. The bottom of the cyclone releaser 206 is fixedly connected to the air flotation tank 1.

[0028] Specifically: The number of cyclone releasers 206 is multiple and evenly distributed at the bottom of the inner cavity of the flotation tank 1, which can make microbubbles form a full coverage in the flotation tank 1, avoiding the problem of insufficient floc separation caused by sparse bubbles in local areas, ensuring that the sewage in each area of ​​the tank can contact with a sufficient amount of microbubbles, and improving the overall pollutant flotation efficiency. The guide plate 204 is spiral-shaped, which can enhance the axial propulsion force of the water flow and strengthen the radial mixing of the agent and sewage through centrifugal force, so that the flocculant forms a three-dimensional diffusion in the sewage, avoiding uneven local concentration.

[0029] Example 2

[0030] Please see Figure 1-4 Based on Embodiment 1, the impurity removal mechanism 3 includes a first motor 301. One side of the first motor 301 is fixedly connected to the flotation tank 1. The output end of the first motor 301 passes through one side of the flotation tank 1 and is fixedly connected to a drive sprocket 302. A chain 303 is meshed on the surface of the drive sprocket 302. A driven sprocket 304 is meshed on the other side of the inner cavity of the chain 303. One side of the driven sprocket 304 is rotatably connected to the flotation tank 1. A scraper 305 is fixedly connected to one side of the chain 303. A spiral blade 306 is provided at the bottom of the scraper 305. A second motor 307 is fixedly connected to one side of the spiral blade 306. One side of the second motor 307 is connected to the flotation tank 1. The flotation tank 1 is fixedly connected. A dosing pipe 4 is provided on one side of the water pipe 201. The bottom of the dosing pipe 4 is fixedly connected to the flocculation pipe 203. Air inlet pipes 5 are provided on both sides of the bottom of the flotation tank 1. One side of the air inlet pipe 5 is fixedly connected to the dissolved air tank 205. A housing 6 is provided on the surface of the second motor 307. One side of the housing 6 is fixedly connected to the flotation tank 1. A collection box 7 is provided on one side of the scraper 305. One side of the collection box 7 is fixedly connected to the flotation tank 1. A movable door 8 is hinged to the other side of the collection box 7. A handle 9 is fixedly connected to one side of the movable door 8. An inclined plate 10 is provided at the bottom of the other side of the movable door 8. One side of the inclined plate 10 is fixedly connected to the collection box 7.

[0031] Specifically: Multiple scrapers 305 are made of corrosion-resistant stainless steel, allowing them to simultaneously cover different areas of the flotation tank 1 surface. This avoids the problem of scum residue caused by the limited coverage of a single scraper 305, and prevents long-term corrosion of the scrapers 305 by acids, alkalis, chloride ions, and organic matter in the wastewater, which could lead to deformation. Plastic scrapers are installed at the bottom to ensure close contact with the water surface without damaging the scum layer. The dosing pipe 4 allows for simultaneous injection of chemicals at the initial stage of wastewater entering the flocculation pipe 203, ensuring rapid contact between the chemicals and wastewater before they enter the mixing area of ​​the spiral guide plate 204. To prevent the reagent from prematurely stagnating in the water pipe 201, resulting in excessively high local concentrations or ineffectiveness, the dissolved air tank 205 is connected to the air compressor and the purified water source respectively through the air inlet pipes 5 on both sides, making it easy to adjust the air intake and purified water volume according to the dissolved air requirements. The shell 6 can provide certain protection for the second motor 307. The collection box 7 is used to collect the impurities scraped off by the scraper 305. The staff can process the impurities in the collection box 7 by opening the movable door 8. The inclined plate 10 guides the impurities to flow in a directional manner by gravity, which can prevent impurities from forming dead corners in the collection box 7 and ensure that all impurities in the collection box 7 can converge towards the movable door 8.

[0032] The working principle of this utility model is as follows: During use, the water pipe 201 is connected to the sewage source. The sewage is pumped into the flocculation pipe 203 by the water pump 202. Then, the agent is added into the flocculation pipe 203 through the dosing pipe 4. Under the action of the guide plate 204, the agent and sewage are fully mixed and enter the flotation tank 1 through the pipe fittings. The dissolved air tank 205 is then connected to the air compressor and the purified water source respectively through the air inlet pipes 5 on both sides. The compressed air and purified water are fully mixed in the dissolved air tank 205, forcibly dissolving the air in the water to form high-pressure saturated dissolved air water, which serves as a reserve air source for subsequent bubble release. After the saturated dissolved air water enters the vortex release device 206 through the pipe fittings, it generates a high-speed vortex along the internal flow channel. Due to centrifugal force and a sudden drop in pressure... Under the action of the air, the dissolved air is rapidly released, forming fine and uniform microbubbles, which are evenly diffused into the flotation tank 1. The microbubbles lift up the fine suspended matter or attach to it, increasing its volume and eventually causing it to float to the surface. However, the microbubbles cannot affect larger particles, which settle to the bottom of the flotation tank. At this time, the first motor 301 starts and drives the drive sprocket 302 to rotate. The drive sprocket 302 drives the chain 303 to rotate, and the chain 303 drives the driven sprocket 304 and the scraper 305 to rotate. The scraper 305 scrapes away the impurities on the surface of the flotation tank 1. The second motor 307 starts and drives the spiral blade 306 to transport the impurities at the bottom out of the flotation tank 1.

[0033] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific implementation methods described. The present specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present utility model, so that those skilled in the art can better understand and utilize the present utility model.

Claims

1. A pretreatment device for wastewater treatment, comprising an air flotation tank (1), characterized in that: A dissolved air flocculation mechanism (2) is provided on one side of the air flotation tank (1), and a dirt removal mechanism (3) is provided inside the air flotation tank (1). The dissolved air flocculation mechanism (2) includes a water pipe (201), which is located on one side of the flotation tank (1). A water pump (202) is fixedly connected to the surface of the water pipe (201), and a flocculation pipe (203) is fixedly connected to the other side of the water pipe (201). The surface of the flocculation pipe (203) is fixedly connected to the flotation tank (1), and a guide plate (204) is fixedly connected to the inner cavity of the flocculation pipe (203). The bottom of the flocculation pipe (203) is fixedly connected to the flotation tank (1) through a pipe fitting. A dissolved air tank (205) is fixedly connected to the bottom of the flotation tank (1). A vortex release device (206) is fixedly connected to one side of the dissolved air tank (205) through a pipe fitting. The bottom of the vortex release device (206) is fixedly connected to the flotation tank (1).

2. The pretreatment device for wastewater treatment according to claim 1, characterized in that: The impurity removal mechanism (3) includes a first motor (301), one side of which is fixedly connected to the flotation tank (1). The output end of the first motor (301) passes through one side of the flotation tank (1) and is fixedly connected to a drive sprocket (302). A chain (303) is meshed on the surface of the drive sprocket (302). A driven sprocket (304) is meshed on the other side of the inner cavity of the chain (303). One side of the driven sprocket (304) is rotatably connected to the flotation tank (1). A scraper (305) is fixedly connected to one side of the chain (303). A spiral blade (306) is provided at the bottom of the scraper (305). A second motor (307) is fixedly connected to one side of the spiral blade (306). One side of the second motor (307) is fixedly connected to the flotation tank (1).

3. The pretreatment device for wastewater treatment according to claim 1, characterized in that: A dosing pipe (4) is provided on one side of the water pipe (201), and the bottom of the dosing pipe (4) is fixedly connected to the flocculation pipe (203).

4. The pretreatment device for wastewater treatment according to claim 1, characterized in that: The air flotation tank (1) is equipped with air inlet pipes (5) on both sides of the bottom, and one side of the air inlet pipe (5) is fixedly connected to the dissolved air tank (205).

5. The pretreatment device for wastewater treatment according to claim 2, characterized in that: The second motor (307) has a housing (6) on its surface, and one side of the housing (6) is fixedly connected to the flotation tank (1).

6. The pretreatment device for wastewater treatment according to claim 2, characterized in that: A collection box (7) is provided on one side of the scraper (305), and one side of the collection box (7) is fixedly connected to the flotation tank (1).

7. The pretreatment device for wastewater treatment according to claim 6, characterized in that: The collection box (7) is hinged to a movable door (8) on the other side, and a handle (9) is fixedly connected to one side of the movable door (8).

8. The pretreatment device for wastewater treatment according to claim 7, characterized in that: An inclined plate (10) is provided at the bottom of the other side of the movable door (8), and one side of the inclined plate (10) is fixedly connected to the collection box (7).

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