Air flotation oil removal system

Abstract

The utility model relates to the technical field of chemical engineering, in particular to an air floatation oil removal system which comprises a dissolved air tank, an air floatation tank, a releaser, a tank inlet line, a tank outlet line and a purging line, and the dissolved air tank is arranged outside an air floatation oil removal device; the air floatation tank is arranged in the air floatation oil removal device; the releaser is arranged at the bottom of the air floatation tank; one end of the tank inlet line is connected to an inlet I of the dissolved air tank, the other end of the tank inlet line is connected to an industrial air pipe network, and a dissolved air tank hand valve is arranged on the tank inlet line; one end of the tank outlet line is connected to an outlet of the dissolved air tank, and the other end of the tank outlet line is connected to the releaser at the bottom of the air floatation tank. The releaser is prevented from being blocked by impurities such as sludge and rust, the releaser can be conveniently put into use next time, a manual disassembly and cleaning method is omitted, and the process that dissolved air flotation is quickly put into use is ensured.

Description

Technical Field

[0001] This utility model relates to the field of chemical technology, specifically to an air flotation oil removal system. Background Technology

[0002] Oily wastewater, after being separated by an inclined plate oil separator, flows by gravity into dissolved air flotation (DAF). DAF employs a partially recirculated pressurized DAF process, with coagulation and flocculation reaction zones at the front end of the flotation. Polyaluminum chloride and polyacrylamide are added respectively, and flocs are formed through stirring, which is beneficial for pollutant removal. Part of the DAF effluent is pressurized and recirculated to the dissolved air tank, which is connected to an industrial air duct to inject air. Under pressure, the air in the tank dissolves in the water and returns to the front end of the flotation along with the water. The dissolved air release device depressurizes the air to form fine bubbles. Dispersed oil, emulsified oil, and suspended solids in the wastewater can adhere to the fine bubbles and float to the surface, forming a scum layer on the liquid surface before separation. This removes fine dispersed oil and some emulsified oil from the wastewater. The scum produced by flotation is then scraped by a scum scraper to a scum collection tank and flows by gravity to a scum pool. The purified DAF effluent flows into a clear water tank and is pumped to the next stage of treatment (walnut shell filter).

[0003] When dissolved air flotation (DAF) release devices are submerged underwater for extended periods, a large amount of sludge accumulates at the bottom of the flotation tank due to prolonged operation. When the sludge level exceeds the release device outlet, the outlet will become clogged if the flotation system is not used for a long time. Simultaneously, the release device carries water vapor, which can cause internal corrosion. After the flotation system is shut down, rust accumulates at the outlet, mixing with the sludge and forming clumps that block the outlet. This results in the release device failing to release air and produce sludge when the flotation system is restarted, affecting the flotation treatment effect. The release device must then be disassembled and the outlet cleaned, increasing operational risks. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model provides an air flotation oil removal system that prevents the release device from being blocked by impurities such as sludge and rust, facilitates the next use, saves manpower for disassembly and cleaning, and ensures that the dissolved air flotation process can be put into use quickly.

[0005] To overcome the above difficulties, avoid frequent manual disassembly and cleaning of the release device, ensure rapid commissioning of the air flotation system, and guarantee its treatment effect, this utility model provides an air flotation oil removal system, including a dissolved air tank, an air flotation pool, a release device, a tank inlet line, a tank outlet line, and a purging line. The dissolved air tank is located outside the air flotation oil removal device; the air flotation pool is located inside the air flotation oil removal device; the release device is located at the bottom of the air flotation pool; one end of the tank inlet line is connected to the inlet of the dissolved air tank, and the other end is connected to the industrial air duct network, with a dissolved air tank manual valve installed on the tank inlet line; one end of the tank outlet line is connected to the outlet of the dissolved air tank, and the other end is connected to the release device at the bottom of the air flotation pool; one end of the purging line is connected to the tank inlet line, and the other end is connected to the main pipe of the release device, with an air supply manual valve installed on the purging line at the inlet of the purging line.

[0006] Furthermore, the release device comprises five units, all of which are disposed at the bottom of the flotation tank.

[0007] Furthermore, the purge line is connected to the manifold of the release device, and the purge line includes five branch lines.

[0008] Furthermore, the five branch lines are connected to the main bodies of the five releasers.

[0009] Furthermore, it also includes a pressurized reflux pump and a pressurized reflux line. One end of the pressurized reflux line is connected to the air flotation oil removal device, and the other end is connected to the inlet 2 of the dissolved air tank through the pressurized reflux pump. A pressurization valve is installed upstream of the dissolved air tank.

[0010] Furthermore, a release inlet manual valve is provided on the tank outlet line, and the release inlet manual valve is located upstream of the release device.

[0011] Furthermore, a scum scraper is installed at the top of the flotation tank. The scum scraper is used to remove the scum generated in the flotation tank. The scum is collected in a trough on the side of the flotation tank. The scum in the trough flows into a scum pool outside the flotation oil removal device through a scum discharge pipeline. A scum discharge valve is installed on the scum discharge pipeline.

[0012] Furthermore, it also includes an air flotation effluent pump, a pump inlet line, and a pump outlet line. One end of the pump inlet line is connected to the air flotation oil removal device, and the other end is connected to the inlet of the air flotation effluent pump. The pump outlet line is connected to the outlet of the air flotation effluent pump. An inlet valve is installed on the pump inlet line, and an outlet valve is installed on the pump outlet line.

[0013] Furthermore, it also includes a first drug zone and a second drug zone, wherein the first drug zone introduces a first dosing line and the second drug zone introduces a second dosing line, the first drug zone is equipped with a first stirring pump and the second drug zone is equipped with a second stirring pump.

[0014] Furthermore, it also includes an oily wastewater line connected to the air flotation oil removal device.

[0015] The beneficial effects of this utility model are as follows: After adding a ventilation and purging pipeline to the main pipe of the dissolved air flotation release device, the pipeline can be ventilated and purged during the period when the flotation is not in use. The rust in the pipeline and the sludge at the outlet of the release device are blown away, preventing the outlet of the release device from being blocked. This avoids the need for personnel to enter the confined space to disassemble and clean the release device, greatly reducing the operational risks. At the same time, it can also ensure that the dissolved air flotation can be put into use in a timely manner and ensure the sewage treatment effect. Attached Figure Description

[0016] Figure 1 This is a process flow diagram of the present invention;

[0017] In the diagram: 100, air flotation oil removal device; 110, air flotation tank; 120, release device; 130, slag scraper; 131, tank; 132, slag discharge pipeline; 1321, slag discharge valve; 140, first chemical zone; 141, first dosing line; 142, first stirring pump; 150, second chemical zone; 151, second dosing line; 152, second stirring pump.

[0018] 200. Tank inlet line; 210. Dissolved gas tank manual valve.

[0019] 300. Tank outlet line; 310. Inlet manual valve.

[0020] 400. Purge line; 410. Air supply manual valve.

[0021] 500. Pressurized reflux pump; 510. Pressurized reflux line; 520. Pressurized valve.

[0022] 600. Air flotation pump; 610. Pump inlet line; 620. Pump outlet line; 630. Outlet valve; 640. Inlet valve.

[0023] 700. Oily wastewater line.

[0024] 800. Dissolved gas tank. Detailed Implementation

[0025] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0026] like Figure 1As shown, an embodiment of the present invention discloses an air flotation oil removal system, comprising a dissolved air tank 800, an air flotation tank 110, a release device 120, a tank inlet line 200, a tank outlet line 300, and a purge line 400. The dissolved air tank 800 is disposed outside the air flotation oil removal device 100; the air flotation tank 110 is disposed inside the air flotation oil removal device 100; the release device 120 is disposed at the bottom of the air flotation tank 110; one end of the tank inlet line 200 is connected to the inlet of the dissolved air tank 800. One end is connected to the industrial air duct network, and a dissolved gas tank manual valve 210 is installed on the tank inlet line 200; one end of the tank outlet line 300 is connected to the outlet of the dissolved gas tank 800, and the other end is connected to the release device 120 at the bottom of the flotation tank 110; one end of the purging line 400 is connected to the tank inlet line 200, and the other end is connected to the main pipe of the release device 120, and an air supply manual valve 410 is installed on the purging line 400, with the air supply manual valve 410 located at the inlet of the purging line 400.

[0027] It should be noted that there are two dissolved air flotation devices on site, one in operation and one on standby, serving as backups for each other. The dissolved air flotation system operates intermittently based on the liquid level of the oily wastewater tank.

[0028] Based on the aforementioned air flotation oil removal system, the system further includes five release devices 120, all of which are located at the bottom of the air flotation tank 110. A purge line 400 is connected to the manifold of the release devices 120, and the purge line 400 includes five branch lines, which are connected to the main pipes of the five release devices 120.

[0029] It should be noted that a tee should be added before the industrial air pipeline valve of the dissolved air tank 800, and a DN15 pipeline should be led to the manifold of the release device 120. Then, five branch lines should be led to connect to the main pipes of the five release devices 120 respectively. When the air flotation is not in use, the ventilation should be used to purge the release devices 120 to prevent the outlet of the release device 120 from being blocked. When the air flotation is put into use, the ventilation valve should be closed and the ventilation should be stopped.

[0030] In one embodiment, the system also includes a pressurized reflux pump 500 and a pressurized reflux line 510. One end of the pressurized reflux line 510 is connected to the air flotation oil removal device 100, and the other end is connected to the inlet 2 of the dissolved air tank 800 through the pressurized reflux pump 500. A pressurized valve 520 is provided upstream of the dissolved air tank 800.

[0031] In one embodiment, a release device 120 inlet manual valve 310 is provided on the tank outlet line 300, and the release device 120 inlet manual valve 310 is located upstream of the release device 120.

[0032] In one embodiment, a scum scraper 130 is installed at the top of the flotation tank 110. The scum scraper 130 is used to remove the scum generated in the flotation tank 110. The scum is collected in the trough 131 on the side of the flotation tank 110. The scum in the trough 131 flows into the scum pool outside the flotation oil removal device 100 through the scum discharge pipeline 132. A scum discharge valve 1321 is installed on the scum discharge pipeline 132.

[0033] In one embodiment, the system further includes an air flotation effluent pump 600, a pump inlet line 610, and a pump outlet line 620. One end of the pump inlet line 610 is connected to the air flotation oil removal device 100, and the other end is connected to the inlet of the air flotation effluent pump 600. The pump outlet line 620 is connected to the outlet of the air flotation effluent pump 600. An inlet valve 640 is provided on the pump inlet line 610, and an outlet valve 630 is provided on the pump outlet line 620.

[0034] In one embodiment, it also includes a first drug zone 140 and a second drug zone 150. The first drug zone 140 is connected to a first dosing line 141, and the second drug zone 150 is connected to a second dosing line 151. The first drug zone 140 is equipped with a first stirring pump 142, and the second drug zone 150 is equipped with a second stirring pump 152.

[0035] In one embodiment, an oily wastewater line 700 is also included, which is connected to the air flotation oil removal device 100.

[0036] It should be noted that the tank inlet line 200 is connected to the industrial air duct network, and the air comes from the industrial air duct network; the pump outlet line 620 goes to the walnut shell filter; the first chemical zone 140 introduces the first dosing line 141, which comes from the first dosing pump; the second chemical zone 150 introduces the second dosing line 151, which comes from the second dosing pump; and the oily wastewater line 700 comes from the inclined plate oil separator.

[0037] In the above-mentioned air flotation oil removal system, a tee is added before the industrial air inlet dissolved gas tank manual valve 210. The purge line 400 connects to the air flotation release device 120 and is connected to the main pipes of the five release devices 120 respectively. An air supply manual valve 410 is installed on the purge line 400, and the ventilation volume is controlled when the purge line 400 is in use.

[0038] When dissolved air flotation is not in use, close the industrial air inlet valve 210 to stop supplying air to the dissolved air tank 800, close the inlet valve 310 of the release device 120 to prevent air from backflowing into the dissolved air tank 800 during the purging of the release device 120, which would reduce the air volume and affect the purging effect, and open the air supply valve 410 to ventilate and purge the release device 120, cleaning up the sludge, rust, and other impurities accumulated at the outlet of the release device, thereby preventing the release device 120 from becoming clogged.

[0039] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0041] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intermediate element present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "above," "below," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

Claims

1. An air flotation oil removal system, characterized in that: include Dissolved gas tank, located outside the air flotation oil removal device; The dissolved air flotation tank is installed inside the dissolved air flotation oil removal device; A release device is located at the bottom of the flotation tank; One end of the tank inlet line is connected to the inlet of the dissolved gas tank, and the other end is connected to the industrial air duct network. A dissolved gas tank manual valve is installed on the tank inlet line. The tank outlet line is connected at one end to the outlet of the dissolved air tank and at the other end to the release device at the bottom of the flotation tank. as well as The purge line is connected at one end to the tank inlet line and at the other end to the main pipe of the release device. An air supply manual valve is installed on the purge line at the inlet of the purge line.

2. The air flotation oil removal system according to claim 1, characterized in that: The release device comprises five units, all of which are located at the bottom of the flotation tank.

3. The air flotation oil removal system according to claim 2, characterized in that: The purge line is connected to the manifold of the release device, and the purge line includes five branch lines.

4. The air flotation oil removal system according to claim 3, characterized in that: The five branch lines are connected to the mains of the five releasers.

5. The air flotation oil removal system according to claim 1, characterized in that: It also includes a pressurized reflux pump and a pressurized reflux line. One end of the pressurized reflux line is connected to the air flotation oil removal device, and the other end is connected to the inlet 2 of the dissolved air tank through the pressurized reflux pump. A pressurized valve is installed upstream of the dissolved air tank.

6. The air flotation oil removal system according to claim 1, characterized in that: A release inlet manual valve is installed on the tank outlet line, and the release inlet manual valve is located upstream of the release device.

7. The air flotation oil removal system according to claim 1, characterized in that: A scum scraper is installed at the top of the flotation tank. The scum scraper is used to remove the scum generated in the flotation tank. The scum is collected in a trough on the side of the flotation tank. The scum in the trough flows into a scum pool outside the flotation oil removal device through a scum discharge pipeline. A scum discharge valve is installed on the scum discharge pipeline.

8. The air flotation oil removal system according to claim 1, characterized in that: It also includes an air flotation effluent pump, a pump inlet line, and a pump outlet line. One end of the pump inlet line is connected to the air flotation oil removal device, and the other end is connected to the inlet of the air flotation effluent pump. The pump outlet line is connected to the outlet of the air flotation effluent pump. An inlet valve is installed on the pump inlet line, and an outlet valve is installed on the pump outlet line.

9. The air flotation oil removal system according to claim 1, characterized in that: It also includes a first drug zone and a second drug zone. The first drug zone introduces a first dosing line, and the second drug zone introduces a second dosing line. The first drug zone is equipped with a first stirring pump, and the second drug zone is equipped with a second stirring pump.

10. The air flotation oil removal system according to claim 1, characterized in that: It also includes an oily wastewater line, which is connected to the air flotation oil removal device.

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