Closed self-circulation secondary gas floatation system

Abstract

The utility model discloses a closed self -circulation two -stage air floatation system, including the air floatation tank of horizontal structure, is equipped with first air floatation chamber and second air floatation chamber in air floatation tank, and the lateral wall top of first air floatation chamber is connected with the water inlet pipe, and the lateral wall below of second air floatation chamber is equipped with the water outlet, install first jetor on water inlet pipe, and first jetor side portion is connected with first air inlet pipe, and the bottom of first air floatation chamber and the bottom of second air floatation chamber are linked through a plurality of drainage tubes, and all install conveying pump and second jetor on drainage tube, and second jetor side portion is connected with second air inlet pipe, the closed self -circulation two -stage air floatation system provided by the utility model, through the step -by -step processing mode of coarse and fine combination, significantly improve the removal rate of pollutant, ensure the high quality of final effluent, solve the problem that traditional dissolved air system is high in energy consumption, low in efficiency and needs complex external equipment.

Description

Technical Field

[0001] This utility model relates to a closed-loop self-circulating two-stage air flotation system, belonging to the field of wastewater treatment technology. Background Technology

[0002] Air flotation technology is often used to treat tiny suspended solids, oil, and grease in wastewater. This technology involves dissolving a certain amount of gas into the water to produce dissolved air water. The microbubbles formed by the depressurization of the dissolved air water collide and adsorb with the flocs to form a three-phase mixture of gas, water, and oil (suspended solids), which floats to the surface and is thus separated from the water.

[0003] Traditional dissolved air flotation (DAF) processes have limited efficiency in capturing pollutants with densities close to water and small particle sizes (such as colloids and partially emulsified oils). After DAF separation, a large number of fine suspended solids remain in the water, making it difficult for the effluent quality to meet high standards for reuse or discharge. Traditional DAF systems typically require additional air compressors, dissolved air tanks, high-pressure pumps, etc., forming a large dissolved air system, which is energy-intensive and relatively complex to maintain and manage.

[0004] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0005] This invention addresses the shortcomings of the prior art by providing a closed-loop self-circulating two-stage dissolved air flotation system. Through a tiered treatment mode combining coarse and fine treatment, it significantly improves the removal rate of pollutants, ensures high quality of the final effluent, and solves the problems of high energy consumption, low efficiency, and the need for complex external equipment in traditional dissolved air flotation systems.

[0006] To solve the above technical problems, the present invention adopts the following technical solution: A closed-loop self-circulating two-stage air flotation system includes a horizontally oriented air flotation tank. The tank contains a first air flotation chamber and a second air flotation chamber. An inlet pipe is connected to the upper side wall of the first air flotation chamber, and an outlet is located at the lower side wall of the second air flotation chamber. A first ejector is installed on the inlet pipe, and the side of the first ejector is connected to a first air inlet pipe. The bottoms of the first and second air flotation chambers are connected by multiple guide pipes, each of which is equipped with a delivery pump and a second ejector. The side of the second ejector is connected to a second air inlet pipe.

[0007] Furthermore, an inclined buffer plate is installed on the upper part of the inner cavity of the first air flotation chamber, with the buffer plate positioned near the outlet of the inlet pipe.

[0008] Furthermore, a partition is provided between the first air flotation chamber and the second air flotation chamber.

[0009] Furthermore, a first slag collection trough is installed in the inner cavity of the first air flotation chamber, and the first slag collection trough is fixed to the side of the partition plate.

[0010] Furthermore, the bottom of the first slag collection tank is connected to the vertically installed first slag discharge pipe, the bottom end of which extends from the bottom of the flotation tank.

[0011] Furthermore, the second air flotation chamber is equipped with an inclined plate assembly and a second slag collection tank.

[0012] Furthermore, the inclined plate assembly consists of multiple inclined plates stacked together, with the inclined plates tilted toward the position of the second slag collection trough.

[0013] Furthermore, the bottom of the second slag collection tank is connected to the vertically installed second slag discharge pipe, the bottom of which extends out from the bottom of the flotation tank.

[0014] Furthermore, the top of the flotation tank is equipped with multiple manholes.

[0015] Compared with the prior art, the present invention, by adopting the above technical solution, has the following advantages: The system employs a two-stage series air flotation process. The first stage is coarse treatment, which removes most of the larger, easily floating suspended solids and grease in the first air flotation chamber, completing the primary purification. The second stage is fine treatment, where the water treated in the first stage is sent to the second air flotation chamber, where the microbubbles generated again specifically capture the remaining, more difficult-to-remove fine pollutants. Through this tiered treatment mode combining coarse and fine treatment, the overall pollutant removal rate is significantly improved, ensuring the high quality of the final effluent.

[0016] Both stages use jet injectors as the core dissolved air components. The jet injectors utilize fluid kinetic energy to self-absorb air, eliminating the need for expensive air compressors and reducing energy consumption. The jet injectors can generate intense water-air mixing and shearing action, forming dissolved air water with high dissolved air efficiency and fine and uniform bubbles. This eliminates the need for complex external components such as dissolved air tanks and air compressors, making the system simpler and reducing the number of failure points.

[0017] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of this utility model.

[0019] In the diagram, 1-flotation tank, 2-baffle plate, 3-first flotation chamber, 4-second flotation chamber, 5-water inlet pipe, 6-first jet injector, 7-first air inlet pipe, 8-buffer plate, 9-first slag collection trough, 10-first slag discharge pipe, 11-drainage pipe, 12-transfer pump, 13-second jet injector, 14-second air inlet pipe, 15-inclined plate assembly, 16-second slag collection trough, 17-second slag discharge pipe, 18-manhole, 19-water outlet. Detailed Implementation

[0020] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.

[0021] like Figure 1 and Figure 2 As shown in the figure, this utility model provides a closed-loop self-circulating two-stage air flotation system, including a horizontal air flotation tank 1. The air flotation tank 1 is provided with a first air flotation chamber 3 and a second air flotation chamber 4 inside. A partition 2 is provided between the first air flotation chamber 3 and the second air flotation chamber 4. An inlet pipe 5 is connected to the upper side wall of the first air flotation chamber 3, and an outlet 19 is provided at the lower side wall of the second air flotation chamber 4.

[0022] A first jet injector 6 is installed on the water inlet pipe 5. The side of the first jet injector 6 is connected to the first air inlet pipe 7. The first jet injector 6 converts the kinetic energy of the fluid into a high-speed jet, causing wastewater or air to be mixed and sprayed into the first air flotation chamber 3, generating numerous fine bubbles with high oxygenation efficiency. By introducing a large number of microbubbles into the water, they adhere to the suspended solids in the wastewater and quickly float to the surface, forming scum.

[0023] An inclined buffer plate 8 is installed in the upper part of the inner cavity of the first air flotation chamber 3, and the buffer plate 8 is located near the outlet of the water inlet pipe 5.

[0024] The first flotation chamber 3 is equipped with a first slag collection trough 9, which is fixed to the side of the partition 2. The bottom of the first slag collection trough 9 is connected to the vertically arranged first slag discharge pipe 10, and the bottom end of the first slag discharge pipe 10 extends out from the bottom of the flotation tank 1.

[0025] The bottom of the first air flotation chamber 3 and the bottom of the second air flotation chamber 4 are connected by multiple drainage pipes 11. Each drainage pipe 11 is equipped with a delivery pump 12 and a second jet injector 13. The side of the second jet injector 13 is connected to the second air inlet pipe 14.

[0026] The wastewater after primary treatment enters the second flotation chamber 4 through the diversion pipe 11 for repeated flotation, further removing residual fine pollutants and obtaining high-quality effluent.

[0027] The second flotation chamber 4 is equipped with an inclined plate assembly 15 and a second slag collection tank 16. The inclined plate assembly 15 is composed of multiple inclined plates stacked together. The inclined plates are inclined towards the second slag collection tank 16, so that the separated slag can slide upward along the bottom of the plate to the second slag collection tank 16.

[0028] The bottom of the second slag collection tank 16 is connected to the vertically arranged second slag discharge pipe 17, the bottom end of which extends from the bottom of the flotation tank 1.

[0029] The top of the flotation tank 1 is equipped with multiple manholes 18.

[0030] The specific working principle of this utility model is as follows: Primary air flotation treatment (coarse treatment): The wastewater to be treated flows in through the inlet pipe 5. Before entering the air flotation tank 1, the water flows through the first ejector 6. Utilizing the negative pressure generated by the high-speed water flow, air is automatically drawn in through the first air inlet pipe 7. The air and wastewater are violently mixed and sheared within the ejector, forming dissolved air water containing a large number of microbubbles. The dissolved air water is sprayed into the first air flotation chamber 3, where the pressure drops sharply, and the air dissolved in the water is released in the form of extremely fine bubbles. These bubbles adhere to suspended particles, grease, and other pollutants in the wastewater, float to the first sludge collection tank 9, and are finally discharged through the first sludge discharge pipe 10.

[0031] Secondary air flotation treatment (fine treatment): The pre-purified water at the bottom of the first air flotation chamber 3 is pumped to the second air flotation chamber 4 by the transfer pump 12. During the pumping process, the second ejector 13 draws in air again and generates dissolved air water. As the water flows upward, the air bubbles adhere again to the finer and more difficult-to-remove pollutants remaining after the first treatment and are guided by the inclined plate to the second slag collection tank 16, and finally discharged through the second slag discharge pipe 17.

[0032] Effluent: After two stages of deep air flotation treatment, the pollutant content in the water is extremely low. Clean water flows out from the outlet 19 below the side wall of the second air flotation chamber, completing the entire treatment process.

[0033] The above description provides examples of the preferred embodiments of this utility model. Any aspects not detailed herein are common knowledge to those skilled in the art. The scope of protection of this utility model is determined by the claims. Any equivalent modifications based on the technical teachings of this utility model are also within the scope of protection of this utility model.

Claims

1. A closed-loop self-circulating two-stage air flotation system, characterized in that: The system includes a horizontally oriented flotation tank (1), which has a first flotation chamber (3) and a second flotation chamber (4) inside. The first flotation chamber (3) is connected to an inlet pipe (5) on the upper side wall, and the second flotation chamber (4) is connected to an outlet (19) on the lower side wall. A first jet ejector (6) is installed on the inlet pipe (5), and the side of the first jet ejector (6) is connected to a first air inlet pipe (7). The bottom of the first flotation chamber (3) and the bottom of the second flotation chamber (4) are connected by multiple drainage pipes (11). Each drainage pipe (11) is equipped with a delivery pump (12) and a second jet ejector (13), and the side of the second jet ejector (13) is connected to a second air inlet pipe (14).

2. The closed-loop self-circulating two-stage air flotation system as described in claim 1, characterized in that: The first air flotation chamber (3) has an inclined buffer plate (8) installed on the upper part of the inner cavity, and the buffer plate (8) is located near the outlet of the water inlet pipe (5).

3. The closed-loop self-circulating two-stage air flotation system as described in claim 1, characterized in that: A partition (2) is provided between the first air flotation chamber (3) and the second air flotation chamber (4).

4. The closed-loop self-circulating two-stage air flotation system as described in claim 1, characterized in that: The first flotation chamber (3) has a first slag collection trough (9) installed in its inner cavity, and the first slag collection trough (9) is fixed to the side of the partition plate (2).

5. The closed-loop self-circulating two-stage air flotation system as described in claim 4, characterized in that: The bottom of the first slag collection tank (9) is connected to the vertically set first slag discharge pipe (10), and the bottom end of the first slag discharge pipe (10) extends out from the bottom of the flotation tank (1).

6. The closed-loop self-circulating two-stage air flotation system as described in claim 1, characterized in that: The second air flotation chamber (4) is equipped with an inclined plate assembly (15) and a second slag collection tank (16).

7. The closed-loop self-circulating two-stage air flotation system as described in claim 6, characterized in that: The inclined plate assembly (15) consists of multiple inclined plates stacked together, with the inclined plates tilted toward the position of the second slag collection trough (16).

8. The closed-loop self-circulating two-stage air flotation system as described in claim 6, characterized in that: The bottom of the second slag collection tank (16) is connected to the vertically arranged second slag discharge pipe (17), and the bottom end of the second slag discharge pipe (17) extends out from the bottom of the flotation tank (1).

9. The closed-loop self-circulating two-stage air flotation system as described in claim 1, characterized in that: The air flotation tank (1) has multiple manholes (18) on its top.

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