Oil product depot sewage treatment device based on air flotation method

Abstract

The utility model belongs to the technical field of sewage treatment, and particularly relates to an oil product depot sewage treatment device based on an air floatation method, which comprises an air floatation tank main body, and a dirty oil tank and a sludge tank arranged on two sides of the air floatation tank main body, and is characterized in that a water inlet pipe is arranged on one side of the air floatation tank main body, and a water outlet pipe is arranged on the other side; a plurality of TV-shaped dissolved air releasers and an impeller mounted through a bolt are mounted at the bottom of the air floatation tank main body through bolts, a blast device and an air draft device are arranged at the top of the air floatation tank main body, and the top of a tank wall, connected with a sludge tank, of the top of the air floatation tank main body is an inclined tank wall. The utility model solves the problems that the releaser is blocked in the existing air flotation technology, the design cost of the existing scum scraper is higher, and the problem that scum rises and is accumulated cannot be well solved; after the device is operated, the scum layer enters the sludge tank, and the dirty oil layer is discharged from the oil outlet through overflow and enters the dirty oil tank. And the treated oil depot sewage is discharged through a drainage pipe at the bottom of the pool.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment, in particular to a sewage treatment device for a finished oil depot based on an air flotation method. Background Art

[0002] Finished oil depots are centralized storage and supply centers for petroleum products. As the number of oil depots increases, the amount of wastewater discharged during their production and operation will also increase accordingly. In addition, the composition of oil depot wastewater is becoming more and more complex due to the complexity of oil types. Wastewater treatment facilities may face greater treatment pressure. If they are not upgraded and optimized accordingly, they may not be able to effectively treat a large amount of oil depot wastewater.

[0003] A large amount of oily wastewater is generated during the storage and transportation of finished oil in oil depots. The main component of oil depot wastewater is water containing petroleum hydrocarbons, which may contain pollutants such as organic solvents, grease, heavy metals, as well as some solid impurities, dissolved gases and dissolved salts.

[0004] Finished oil depot wastewater usually requires appropriate pretreatment and biochemical treatment methods to reduce the concentration of organic matter, change the characteristics of organic matter, and provide suitable biochemical conditions.

[0005] Dissolved air flotation (DAF) is a liquid treatment process that introduces sewage (or clean water) and compressed air into a dissolved air tank. Then, under certain pressure conditions, the air is dissolved in water to become dissolved air water, and the dissolved air water reaches a saturated state. Then the dissolved air water is decompressed into the flotation tank. Under normal pressure, the dissolved air escapes from the water to form a water-air-particle three-phase mixed system. Tiny bubbles act as carriers to precipitate pollutants adhering to the water, float on the water surface to form scum, which is scraped off by a scraper, and the water in the system is initially purified.

[0006] However, if the water pollution level is high, the existing flotation technology has the problem that the scraper cannot solve the problem of rising accumulation. The existing technology also has the problem that part of the sewage will be taken away when scraping the foam, and the cost of removing the scum is too high.

[0007] In general, the wastewater from oil depots is characterized by large volume and high pollution. The organic matter characteristics, concentration, microbial adaptability and treatment process of wastewater from oil depots will affect its biodegradability. Through scientific evaluation and reasonable operation, the biodegradability of wastewater from oil depots can be improved, making it easier to be degraded by microorganisms, and indirectly improving the efficiency of wastewater treatment. Summary of the invention

[0008] The utility model aims to provide a finished oil depot sewage treatment device based on air flotation method, so as to solve the current situation that the operation effect of industrialized treatment of oil depot sewage in China is not ideal.

[0009] The purpose of this utility model is achieved through the following technical solutions:

[0010] The utility model discloses a wastewater treatment device for a finished oil depot based on an air flotation method, comprising an air flotation tank body, and a dirty oil tank and a sludge tank arranged on both sides of the air flotation tank body, characterized in that a water inlet hole is provided on one side of the air flotation tank body, and a water inlet pipe is fixed by a flange and is controlled by a valve control switch, a drainage hole is provided on the other side of the air flotation tank body, and a drainage pipe is fixed by a flange and is controlled by a valve control switch, a plurality of TV-type dissolved air releasers and a bolt-mounted impeller are bolted to the bottom of the air flotation tank body, a blast device and an exhaust device are arranged on the top of the air flotation tank body, one side of the blast device is connected to the dirty oil tank, one side of the exhaust device is connected to the sludge tank, and the top of the pool wall where the top of the air flotation tank body is connected to the sludge tank is arranged as an inclined pool wall.

[0011] A dirty oil outlet and a scum outlet are arranged on the upper part of the main body of the air flotation tank. The dirty oil outlet is connected to the dirty oil tank, and the scum outlet is connected to the sludge tank.

[0012] The main body diameter of the flotation tank is D, the body diameters of the waste oil tank and the sludge tank are both 1 / 6D, the aperture d of the water inlet pipe is 20 mm, and the aperture d of the drainage pipe is 40 mm.

[0013] The inclination angle of the inclined pool wall is 30° to 35° with respect to the horizontal.

[0014] The blowing device is a blower or a blowing fan.

[0015] The exhaust device is an exhaust fan or an exhaust fan.

[0016] Advantages of the utility model:

[0017] The utility model of the finished oil depot wastewater treatment device based on the flotation method solves the problem of blockage of the releaser in the existing flotation technology and the problem that the current scraper has a high design cost and cannot solve the problem of rising and accumulating scum; after the device is operated, the scum layer enters the sludge pool, and the dirty oil layer is discharged into the dirty oil pool through the oil outlet through overflow. The treated oil depot wastewater is discharged through the drain pipe at the bottom of the pool. From a technical perspective, the present invention can realize the separation and recovery of petroleum hydrocarbons and solid impurities in water, reduce the pollution level of water bodies, reduce the burden of subsequent treatment processes, and reduce energy costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model.

[0019] Figure 2 For this utility model Figure 1 Top view of the .

[0020] Figure 3 It is a partial detailed view of the inclined pool wall part of the utility model.

[0021] In the figure: 1 water inlet pipe, 2 TV type dissolved air releaser, 3 impeller, 4 air blowing equipment, 5 waste oil pool, 6 scum layer, 7 inclined pool wall, 8 exhaust equipment, 9 drain pipe, 10 sludge pool. DETAILED DESCRIPTION

[0022] The specific implementation of the present utility model is further described below in conjunction with the accompanying drawings.

[0023] like Figure 1 , 2 As shown in Figure 3, the utility model of the finished oil depot sewage treatment device based on the flotation method includes a flotation tank body, a dirty oil tank 5 and a sludge tank 10 arranged on both sides of the flotation tank body, characterized in that a water inlet hole is opened on one side of the flotation tank body and a water inlet pipe 1 is fixed with a flange and controlled by a valve control switch, a drainage hole is opened on the other side of the flotation tank body and a drainage pipe 9 is fixed with a flange and controlled by a valve control switch, a plurality of TV-type dissolved air releasers 2 and a bolt-mounted impeller 3 are bolted to the bottom of the flotation tank body, a blast device 4 and an exhaust device 8 are arranged on the top of the flotation tank body, one side of the blast device 4 is connected to the dirty oil tank 5, one side of the exhaust device 8 is connected to the sludge tank 10, and the top of the pool wall where the top of the flotation tank body is connected to the sludge tank is arranged as an inclined pool wall 7.

[0024] A waste oil outlet and a scum outlet are arranged on the upper part of the main body of the flotation tank. The waste oil outlet is connected to the waste oil tank 5 , and the scum outlet is connected to the sludge tank 10 .

[0025] The main body diameter of the flotation tank is D, the body diameters of the waste oil tank 5 and the sludge tank 10 are both 1 / 6D, the aperture d of the water inlet pipe 1 is 20 mm, and the aperture d of the drainage pipe 9 is 40 mm.

[0026] The inclined pool wall 7 has an angle of inclination of 30° to 35° with respect to the horizontal.

[0027] The blowing device 4 is a blower or a blowing fan.

[0028] The exhaust device 8 is an exhaust fan or an exhaust fan.

[0029] The method for treating wastewater in a finished oil depot of the utility model comprises the following steps:

[0030] S1. The oil depot sewage enters the main part of the flotation tank through the water inlet pipe 1, and the reagent is added therein. The pressure dissolved air water rapidly dissipates energy in the TV-type dissolved air releaser 2 at the bottom of the tank due to the sudden change in flow state, so that the dissolved air water instantly and fully releases tiny bubbles under the condition of reduced pressure. The impeller 3 at the bottom of the tank rotates to stir the oil depot sewage and fully mix the tiny bubbles. During the flow process, the tiny bubbles combine with the solid components and oil droplets in the oil depot sewage and float to the top of the tank under the action of gravity and the centrifugal force generated by the impeller. The settled sludge continues to mix with the tiny bubbles under the action of the rotation of the impeller 3 at the bottom of the tank and fully floats.

[0031] S2. The oil droplets floating to the surface of the pool in step S1 gather into a dirty oil layer under the action of shallow sedimentation, and the solid components and bubbles are mixed into a scum layer 6. Under the joint action of the blowing device 4 and the exhaust device 8, the scum layer 6 jumps over the inclined pool wall 7 at a speed higher than the dirty oil layer and enters the sludge pool 10. The dirty oil layer is discharged into the dirty oil pool 5 through the oil outlet, and the treated oil depot sewage is discharged through the drain pipe 9 at the bottom of the pool.

[0032] The water pressure of the TV-type dissolved air releaser 2 arranged at the bottom of the main body of the flotation tank is controlled between 0.30MPa and 0.35MPa.

[0033] The hydraulic retention time in the main body of the flotation tank is controlled to be more than 20 minutes, and the water pressure is 0.4MPa~0.45MPa.

[0034] Example: See Figure 1 to Figure 3 A finished oil depot sewage treatment device based on flotation method includes: a flotation tank body, a waste oil tank 5, and a sludge tank 10. The flotation tank body is provided with a water inlet hole on one side of the tank and a water inlet pipe 1 is fixed by a flange and controlled by a valve control switch connected by a flange, and a drainage hole is provided on the other side and a drainage pipe 9 is fixed by a flange and controlled by a valve control switch connected by a flange. A plurality of TV-type dissolved air releasers 2 and an impeller 3 are installed at the bottom of the tank, and a blast device 4 and an exhaust device 8 are arranged on the top of the flotation tank, and one side of the blast device 4 is connected to the oil storage tank 5, and one side of the exhaust device 8 is connected to the sludge tank 10, and the top of the tank wall connected to the sludge tank is arranged as an inclined tank wall 7.

[0035] Specifically, sewage is introduced into the main body of the flotation tank through the water inlet pipe 1, and the TV-type dissolved air releaser 2 releases tiny bubbles, which bring the oil droplets and solid components in the sewage to the top of the main body of the flotation tank through the action of the tiny bubbles. Under the joint action of the blasting device 4 and the exhaust device 8, the scum layer 6 jumps over the inclined tank wall 7 at a higher speed than the dirty oil layer and enters the sludge tank 10, and the dirty oil layer is discharged from the oil outlet through overflow into the dirty oil tank 5. The treated oil depot sewage is discharged through the drain pipe 9 at the bottom of the tank.

[0036] Furthermore, the running speed of the impeller 3 at the bottom of the main body of the flotation tank is controlled, and the function of the impeller 3 is changed from mixing tiny bubbles with sewage in the early stage of treatment to allowing the settled sludge to re-enter the middle of the flotation tank and combine with tiny bubbles in the later stage of treatment, thereby reducing the external environmental pressure of the dissolved air releaser.

[0037] Furthermore, the treated sewage flows out through the drain pipe 9 and enters the subsequent treatment link for soluble organic matter, which greatly reduces the treatment pressure of the subsequent links.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A finished oil depot wastewater treatment device based on air flotation method, comprising an air flotation tank body, a waste oil tank and a sludge tank arranged on both sides of the air flotation tank body, characterized in that: A water inlet hole is provided on one side of the main body of the flotation tank and a water inlet pipe is fixed by a flange and controlled by a valve control switch. A drain hole is provided on the other side of the main body of the flotation tank and a drain pipe is fixed by a flange and controlled by a valve control switch. A plurality of TV-type dissolved air releasers and a bolt-mounted impeller are bolted to the bottom of the main body of the flotation tank. A blast device and an exhaust device are provided on the top of the main body of the flotation tank. One side of the blast device is connected to the dirty oil pool, and one side of the exhaust device is connected to the sludge pool. The top of the pool wall where the top of the main body of the flotation tank is connected to the sludge pool is set as an inclined pool wall.

2. The finished oil depot wastewater treatment device based on flotation method according to claim 1 is characterized in that: A dirty oil outlet and a scum outlet are arranged on the upper part of the main body of the air flotation tank. The dirty oil outlet is connected to the dirty oil tank, and the scum outlet is connected to the sludge tank.

3. The finished oil depot wastewater treatment device based on air flotation method according to claim 1 is characterized in that: The main body diameter of the flotation tank is D, the body diameters of the waste oil tank and the sludge tank are both 1 / 6D, the aperture d of the water inlet pipe is 20 mm, and the aperture d of the drainage pipe is 40 mm.

4. The finished oil depot wastewater treatment device based on air flotation method according to claim 1 is characterized in that: The inclination angle of the inclined pool wall is 30° to 35° with respect to the horizontal.

5. The finished oil depot wastewater treatment device based on air flotation method according to claim 1 is characterized in that: The blowing device is a blower or a blowing fan.

6. The finished oil depot wastewater treatment device based on air flotation method according to claim 1 is characterized in that: The exhaust device is an exhaust fan or an exhaust fan.

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