Sewage surface floating oil absorption and separation system and method

Abstract

The present invention provides a system and method for absorbing and separating oil floating on the surface of sewage. The system includes: a vacuum pump; an intermediate tank configured to communicate with a sewage tank pipeline and connected to the vacuum pump at the top; an oil-water separation tank configured to communicate with the intermediate tank pipeline and contain an oil-stain separation tank, wherein the oil-stain separation tank is divided into an oil-water mixed tank and an oil-stain tank by a separation partition, and an oil-stain outlet is provided at the bottom of the oil-stain tank; and a pipeline mechanism including pipeline components for achieving pipeline connectivity. The system for absorbing and separating oil floating on the surface of sewage provided by the present invention uses a vacuum pump and a valve group to control negative pressure suction of the oil-water mixture and perform secondary oil-water separation treatment. Negative pressure suction is used to prevent solid impurities from damaging high-speed blades, thereby achieving oil-water separation.

Description

Technical Field

[0001] The present invention relates to the technical field of water surface oil pollution cleaning, and in particular to a system and method for absorbing and separating floating oil on sewage surface. Background Art

[0002] In industrial production, oil often leaks into cooling water, or floating oil on the surface of machine tool cutting fluid requires recovery and cleaning. Current methods for cleaning oily surfaces include oil suction belts, steel belt skimmers, and centrifugal pumps. Oil suction belts are inconsistent and require more complex post-processing. Steel belt skimmers have low suction efficiency. Centrifugal pumps, due to their high speed, cannot absorb liquids containing impurities, which can damage the blades and pump body. The suction port is located close to the liquid surface, drawing in more air and causing significant cavitation damage. The suction port must be located a certain depth below the liquid surface, and the large, unadjustable amount of oil-water mixture sucked in is detrimental to subsequent oil-water separation.

[0003] Therefore, the device for absorbing and separating floating oil on the sewage surface needs to be improved. Summary of the Invention

[0004] The present invention provides a system and method for absorbing and separating floating oil on the surface of sewage. A vacuum pump and a valve group are used to control negative pressure to suck in an oil-water mixture and perform secondary oil-water separation treatment. Negative pressure suction is used to prevent solid impurities from damaging high-speed blades, thereby achieving oil-water separation.

[0005] In order to solve at least one of the above technical problems, the present invention adopts the following technical solutions:

[0006] According to the present invention, a system for absorbing and separating floating oil on the surface of sewage is provided, comprising: a vacuum pump; an intermediate tank, which is arranged to be connected to a sewage pool pipeline and is connected to the vacuum pump at the upper part; an oil-water separation tank, which is arranged to be connected to the intermediate tank pipeline and includes an oil-stain separation tank, wherein the oil-stain separation tank is divided into an oil-water mixing tank and an oil-stain tank by a separation partition, and an oil-stain outlet is provided at the lower part of the oil-stain tank; and a pipeline mechanism, which includes pipeline components for realizing pipeline communication.

[0007] According to one embodiment of the present invention, there are multiple intermediate tanks.

[0008] According to one embodiment of the present invention, the intermediate tank includes: a tank body; a control valve installed on the pipeline between the tank body and the vacuum pump; a regulating valve installed at the opening inside the tank body leading to the external environment; a water level detection switch, including an upper water level detection switch and / or a lower water level detection switch arranged on the side wall of the tank body; and a flow control valve installed on the pipeline between the tank body and the oil-water separation tank.

[0009] According to one embodiment of the present invention, the oil-water separation tank further includes an inlet tank, wherein the inlet tank and the oil-water mixed tank of the oil separation tank are separated by a first partition, and the height of the first partition is greater than the height of the separation partition; the oil-water mixture from the intermediate tank flows into the inlet tank; a first oil outlet is provided at the bottom of the inlet tank, and a first drain valve is installed at the first oil outlet.

[0010] According to one embodiment of the present invention, the oil-water separation tank further includes a clear water tank, wherein the clear water tank and the oil pool of the oil separation tank are separated by a second partition, and the height of the second partition is greater than the height of the separation partition; the clear water tank and the oil-water mixing tank of the oil separation tank are connected at a height lower than the second partition; a clear water outlet is provided on the side wall of the clear water tank; a second oil outlet is provided at the bottom of the clear water tank, and a second drain valve is installed at the second oil outlet.

[0011] According to one embodiment of the present invention, a clean water height adjustment mechanism is provided in the clean water tank, comprising: a fixed elbow, one end of which is connected to the clean water outlet and the other end is open toward the clean water liquid level; an adjustment tube, one end of which is connected to the opening of the fixed elbow toward the liquid surface and the other end of which is open flush with the clean water liquid level; and a rubber ring, which is configured to seal the fixed elbow and the adjustment tube and enable the adjustment tube to slide relative to the fixed elbow in a direction perpendicular to the clean water liquid level.

[0012] According to one embodiment of the present invention, the system further includes a floating island floating on the liquid surface of the sewage pool, and the pipeline mechanism includes an oil suction pipe connecting the sewage pool and the intermediate tank, wherein one end of the oil suction pipe connected to the sewage pool is installed on the floating island.

[0013] According to one embodiment of the present invention, the pipeline mechanism includes: a water outlet pipe, which is configured to connect the intermediate tank to the oil-water separation tank and has at least a portion that is spiral; and a return pipe, which is configured to connect the clean water outlet to the sewage pool.

[0014] According to the present invention, a method for absorbing and separating floating oil on the surface of sewage using the above-mentioned floating oil absorption and separation system is provided, comprising the following steps: step S1, starting a vacuum pump to suck in an oil-water mixture in a sewage pool when the vacuum level in an intermediate tank reaches a predetermined value; step S2, in response to the liquid level in the intermediate tank reaching a predetermined height, causing the oil-water mixture to flow into an oil-water separation tank; and step S3, causing the floating oil to flow over a separation baffle into an oil pool and out of an oil outlet, thereby achieving oil-water separation.

[0015] According to one embodiment of the present invention, step S2 includes: in response to the upper water level detection switch detecting that the liquid level in the intermediate tank reaches a predetermined height, closing the control valve and opening the regulating valve to allow the oil-water mixture to automatically flow into the oil-water separation tank.

[0016] Due to the adoption of the above technical solution, the surface oil pollution in the sewage pool can be continuously or periodically treated and oil-water separation can be achieved. Compared with the traditional oil suction pump, it has at least the following advantages:

[0017] 1) The vacuum pump and valve group are used to control the negative pressure to suck the oil-water mixture and perform secondary oil-water separation. The negative pressure suction method is used to prevent solid impurities from damaging the high-speed blades and achieve oil-water separation;

[0018] 2) It can process oil-water mixtures containing more solid impurities. The suction port is closer to the liquid surface and the water content in the suction mixture is less, which can also achieve the suction of bubble-type surface oil stains;

[0019] 3) The material suction flow and discharge flow can be adjusted steplessly by adjusting the opening of the relevant valves;

[0020] 4) Use double tank sequential suction to achieve continuous or timed treatment of surface oil pollution in the sewage pool;

[0021] 5) The equipment has a lift of about 4-5m. The separated waste oil can be pumped into the sealed tank to a specified height through compressed air to achieve sewage treatment in low-lying areas;

[0022] 6) The oil suction port in the sewage pool needs to be adjusted close to the water surface to better absorb floating oil;

[0023] 7) The spiral outlet pipe at the bottom of the intermediate tank forms a cyclone field after entering the liquid inlet pool, which slows down the impact of water flow and is more conducive to oil-water separation;

[0024] 8) The height of the drain outlet of the lower oil-water separation tank is adjustable, so as to adjust the water level in the tank and thus adjust the oil-water ratio at the oil discharge outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0026] Figure 1 is a schematic diagram of a system for absorbing and separating floating oil on the surface of sewage according to an embodiment of the present invention;

[0027] Figure 2 is a schematic diagram of a fresh water height adjustment mechanism according to an embodiment of the present invention;

[0028] Figure 3is a perspective view of a sewage surface floating oil absorption and separation system according to another embodiment of the present invention;

[0029] Figure 4 yes Figure 3 A front cross-sectional view of the sewage surface floating oil absorption and separation system shown;

[0030] Figure 5 The present invention is a flowchart of a method for absorbing and separating floating oil on the surface of sewage according to an embodiment of the present invention.

[0031] Description of Reference Numerals

[0032] 10 sewage pool, 11 water, 12 oil pollution;

[0033] 100 vacuum pumps;

[0034] 200 intermediate tank, 210 first tank body, 211 first normally closed solenoid valve, 212 first normally open solenoid valve, 213 first manual valve, 214 first upper water level detection switch, 215 first lower water level detection switch, 216 first one-way valve, 220 second tank body, 221 second normally closed solenoid valve, 222 second normally open solenoid valve, 223 second manual valve, 224 second upper water level detection switch, 225 second lower water level detection switch, 226 second one-way valve;

[0035] 300 flow control valve;

[0036] 400 oil-water separation tank, 410 liquid inlet tank, 411 first sewage valve, 420 oil-sludge separation tank, 421 oil-water mixing tank, 422 oil-sludge tank, 423 separation baffle, 424 second sewage valve, 430 clean water tank, 431 clean water outlet, 432 clean water height adjustment mechanism, 4321 fixed elbow, 4322 adjustment pipe, 4323 rubber ring, 440 first baffle, 450 second baffle;

[0037] 500 piping mechanism, 510 first oil suction pipe, 511 first oil suction port, 520 second oil suction pipe, 521 second oil suction port, 530 spiral water outlet pipe, 540 return pipe;

[0038] 600 floating islands;

[0039] 700 bracket. DETAILED DESCRIPTION

[0040] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0041] The terms "including," "having," and any variations thereof in the present specification, claims, and accompanying drawings are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the present specification, claims, and accompanying drawings are used to distinguish between different items, not to describe a particular order. "Multiple" means two or more, unless otherwise expressly specified.

[0042] In the specification and claims of the present invention and the above-mentioned description of the drawings, when an element is referred to as being “fixed to,” “mounted on,” “disposed on,” or “connected to” another element, it may be directly or indirectly located on the other element. For example, when an element is referred to as being “connected to” another element, it may be directly or indirectly connected to the other element.

[0043] Furthermore, references herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0044] Figure 1 A system for absorbing and separating floating oil from wastewater surfaces according to an embodiment of the present invention is shown. The system generally comprises a vacuum pump 100, an intermediate tank 200, an oil-water separator tank 400, and a piping system 500. Specifically, the intermediate tank 200 is connected to a sewage tank 10 via a pipeline and is connected to the vacuum pump 100 at its upper portion. The oil-water separator tank 400 is connected to the intermediate tank 200 via a pipeline and contains an oil-stain separation tank 420. The oil-stain separation tank 420 is divided into an oil-water mixing tank 421 and an oil-stain tank 422 by a separator 423. An oil-stain outlet is provided at the lower portion of the oil-stain tank 422. The piping system 500 may include piping components for achieving piping connectivity.

[0045] The number of intermediate tanks 200 can be one or more. Compared with setting one intermediate tank 200, setting multiple intermediate tanks 200 can be used alternately, so that the floating oil absorption step at the sewage pool 10 end and the oil-water separation step at the oil-water separation tank 400 end can be carried out simultaneously without interruption, and the floating oil absorption and separation efficiency is higher. Figure 1In the illustrated embodiment, there are two intermediate tanks 200, namely a first intermediate tank and a second intermediate tank, each of which includes: a tank body, a control valve installed on the pipeline between the tank body and the vacuum pump 100, a regulating valve installed at the opening inside the tank body leading to the external environment, a water level detection switch arranged on the side wall of the tank body, and a flow control valve 300 installed on the pipeline between the tank body and the oil-water separation tank 400. Specifically, the first intermediate tank may include a first tank body 210; a first normally closed solenoid valve 211 is installed as a control valve on the pipeline between the first tank body 210 and the vacuum pump 100; a first normally open solenoid valve 212 and a first manual valve 213 are installed as regulating valves at the opening of the interior of the first tank body 210 leading to the external environment, so as to automatically and / or manually adjust the vacuum degree in the first tank body 210; a first upper water level detection switch 214 and a first lower water level detection switch 215 are respectively provided on the side walls of the first tank body 210 to detect whether the liquid level in the first tank body 210 reaches the upper and lower limit positions; a first one-way valve 216 is installed on the pipeline at the outlet of the first tank body 210 to control the outflow of liquid in the first tank body 210. Similar to the first intermediate tank, the second intermediate tank may include a second tank body 220; a second normally closed solenoid valve 221 is installed as a control valve on the pipeline between the second tank body 220 and the vacuum pump 100; a second normally open solenoid valve 222 and a second manual valve 223 are installed as regulating valves at the opening of the interior of the second tank body 220 leading to the external environment, so as to automatically and / or manually adjust the vacuum degree in the second tank body 220; a second upper water level detection switch 224 and a second lower water level detection switch 225 are respectively provided on the side walls of the second tank body 220 to detect whether the liquid level in the second tank body 220 has reached the upper and lower limit positions; a second one-way valve 226 is installed on the pipeline at the outlet of the second tank body 220 to control the outflow of liquid in the second tank body 220. In this embodiment, the first tank body 210 and the second tank body 220 share a flow control valve 300, that is, the pipelines connecting the outlets of the first tank body 210 and the second tank body 220 are merged and connected to the flow control valve 300, and then the pipelines are connected to the oil-water separation tank 400.

[0046] In an embodiment of the present invention, the oil-water separation tank 400 may further include an inlet tank 410. The inlet tank 410 is separated from the oil-water mixing tank 421 of the oil-sludge separation tank 420 by a first partition 440. The oil-water mixture from the intermediate tank 200 flows into the inlet tank 410, and then the oil-sludge floating on the upper layer of the inlet tank 410 passes over the first partition 440 and enters the oil-water mixing tank 421. Since the height of the first partition 440 is greater than the height of the separation partition 423, the liquid level in the oil-water mixing tank 421 will not reach the top of the first partition 440, thereby preventing the liquid in the oil-water mixing tank 421 from flowing back into the inlet tank 410. A first oil-sludge outlet is provided at the bottom of the inlet tank 410, and a first drain valve 411 is installed at the first oil-sludge outlet to discharge the sewage from the inlet tank 410.

[0047] Furthermore, the oil-water separation tank 400 may also include a clean water tank 430. The clean water tank 430 is separated from the oil pool 422 of the oil separation tank 420 by a second partition 450. The height of the second partition 450 is greater than the height of the separation partition 423 to prevent the oil in the oil pool 422 from entering the clean water tank 430. The clean water tank 430 is connected to the oil-water mixing tank 421 of the oil separation tank 420 at a height lower than the second partition 450, so that the clean water in the lower layer of the oil-water mixing tank 421 can flow into the clean water tank 430. Figure 1 In the illustrated embodiment, the clean water tank 430 is connected to the oil-water separation tank 420 at the bottom of the oil-water separation tank 400. A clean water outlet 431 is provided on the sidewall of the clean water tank 430. This outlet 431 can be positioned higher on the sidewall to prevent dirt that has settled at the bottom of the clean water tank 430 from being discharged through the outlet 431. A second oil-water outlet is provided at the bottom of the clean water tank 430, and a second drain valve 424 is installed at the second oil-water outlet.

[0048] Preferably, a clean water height adjustment mechanism 432 is provided in the clean water tank 430 for adjusting the height of the liquid level in the clean water tank 430. Figure 2As shown, the clean water height adjustment mechanism 432 may include: a fixed elbow 4321, an adjustment tube 4322, and a rubber ring 4323. Specifically, the fixed elbow 4321 is connected to the clean water outlet 431 at one end and opens toward the clean water level at the other end. The adjustment tube 4322 is connected to the opening of the fixed elbow 4321 that faces the liquid level at one end and opens flush with the clean water level at the other end. The rubber ring 4323 may be configured to seal the fixed elbow 4321 and the adjustment tube 4322 and allow the adjustment tube 4322 to slide relative to the fixed elbow 4321 in a direction perpendicular to the clean water level. The height of the opening of the adjustment tube 4322 facing the clean water level is adjusted by the adjustment tube 4322 sliding relative to the fixed elbow 4321. The rubber ring 4323 provides damping as the adjustment tube 4322 slides, maintaining the relative position of the adjustment tube 4322 and the fixed elbow 4321 after manual adjustment to the desired height.

[0049] Continue to refer to Figure 1 The sewage surface oil absorption and separation system according to the present invention further includes a floating island 600 floating on the liquid surface of the sewage tank 10. The piping system 500 includes an oil suction pipe connecting the sewage tank 10 and the intermediate tank 200. One end of the oil suction pipe connected to the sewage tank 10 is mounted on the floating island 600 to absorb the oil-water mixture from the upper layer of the sewage tank 10. The piping system 500 may include an outlet pipe 530, which is configured to connect the intermediate tank 200 to the oil-water separation tank 400. Preferably, at least a portion of the outlet pipe 530 may be spiral-shaped, so that the oil-water mixture forms a vortex field after entering the inlet tank 410 of the oil-water separation tank 400, reducing water flow impact and facilitating oil-water separation. Furthermore, the piping system 500 may also include a return pipe 540, which is configured to connect the clean water outlet 431 to the sewage tank 10, allowing the separated clean water to flow back to the sewage tank 10.

[0050] like Figure 3-4 As shown, the aforementioned components of the wastewater surface oil absorption and separation system can be supported and secured by a frame 700. Furthermore, an operating box (not shown) can be provided to house the system's control components, such as a PLC. Preferably, the control box is also secured to the frame 700. Its panel can be equipped with an emergency stop button and can be programmed to operate in two modes: scheduled start / stop and long-term operation.

[0051] In one embodiment of the present invention, the system installation and usage parameters are as follows:

[0052] 1) The main equipment size is approximately: 1050mm×800mm×1700mm;

[0053] 2) Equipment weight: approximately 0.5t;

[0054] 3) Equipment installation platform height: 1-2m;

[0055] 4) Motor power 1.5KW;

[0056] 5) The required compressed air pressure is about 0.6Mpa.;

[0057] 6) The main hardware configuration of the control system is as follows: the switch elements are Schneider products; the PLC (Programmable Logic Controller) is Siemens products.

[0058] like Figure 5 As shown, the method for absorbing and separating floating oil on the surface of sewage using the floating oil absorption and separation system according to the present invention generally requires the following steps:

[0059] Step S1, starting the vacuum pump 100, and when the vacuum degree in the intermediate tank 200 reaches a predetermined value, sucking the oil-water mixture in the sewage pool 10;

[0060] Step S2, in response to the liquid level in the intermediate tank 200 reaching a predetermined height, allowing the oil-water mixture to flow into the oil-water separation tank 400; and

[0061] In step S3, the floating oil flows over the separation partition 423 into the oil pool 422 and flows out from the oil outlet, thus achieving oil-water separation.

[0062] In this embodiment of the present invention, the system is installed approximately 3 meters above the liquid level in the sewage tank 10. The first and second oil suction pipes 510, 520 are fixed to the floating island 600, and the heights of the first and second oil suction ports 511, 521 are adjusted to be close to the liquid level.

[0063] In step S1, the first normally closed solenoid valve 211 is opened, the first normally open solenoid valve 212 is closed, and the first manual valve 213 is closed. The vacuum pump 100 is activated. When the vacuum level in the first tank 210 reaches a certain value, the oil-water mixture in the oil sump 10 is sucked in. Fine adjustments to the opening of the first manual valve 213 adjust the suction flow rate.

[0064] In step S2, when the first upper water level detection switch 214 detects a liquid level signal, the second normally closed solenoid valve 221 is opened, the second normally open solenoid valve 222 is closed, the first normally closed solenoid valve 211 is closed, and the first normally open solenoid valve 212 is opened. The vacuum in the first tank body 210 disappears, and the liquid in the tank automatically flows into the oil-water separation tank. The outflow flow rate can be adjusted by adjusting the opening of the flow control valve 300, so that the oil-water separation effect of the lower equipment is better. The outflow rate of the intermediate tank can be greater than the intake rate. When the second upper water level detection switch 224 of the second tank body 220 detects a liquid level signal, the valve group related to the second tank body 220 is actuated to close the second tank body 220, and the first tank body 210 is started, and the reciprocating sequence cycle is repeated.

[0065] In step S3, after the mixed liquid flows into the oil-water separation tank 400, it first flows into the liquid inlet pool 410 and then into the oil-water mixing pool 421. The floating oil flows into the oil pool 422 through the separation partition 423 and then flows out. The clean water flows into the clean water pool 430 through the lower connecting pipe and is discharged from the clean water outlet 431.

[0066] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0067] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0068] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A sewage surface floating oil absorption and separation system, characterized in that: include: Vacuum pump (100); An intermediate tank (200) is arranged to be in communication with a pipeline of a sewage tank (10) and connected to the vacuum pump (100) at the upper portion, wherein the intermediate tank (200) comprises: a tank body; a control valve installed on the pipeline between the tank body and the vacuum pump (100); a regulating valve installed at an opening of the tank body leading to the external environment; a water level detection switch, comprising an upper water level detection switch and / or a lower water level detection switch arranged on a side wall of the tank body; and a flow control valve (300) installed on the pipeline between the tank body and the oil-water separation tank (400); The oil-water separation tank (400) is configured to be in communication with the intermediate tank (200) through a pipeline and comprises an oil-water separation tank (420), a liquid inlet tank (410) and a clear water tank (430), wherein the oil-water separation tank (420) is divided into an oil-water mixed tank (421) and an oil-water tank (422) by a separation baffle (423), and an oil-water outlet is provided at the lower portion of the oil-water tank (422); the clear water tank (430) and the oil-water tank (422) of the oil-water separation tank (420) are separated by a second baffle (450), and the height of the second baffle (450) is greater than the height of the separation baffle (423); the clear water tank (430) and the oil-water mixed tank (421) of the oil-water separation tank (420) are at a height lower than the height of the separation baffle (423); The second partition (450) is connected at the height of the second partition (450); the side wall of the clean water tank (430) is provided with a clean water outlet (431); the bottom of the clean water tank (430) is provided with a second oil outlet, and the second oil outlet is installed with a second sewage valve (424); the inlet tank (410) and the oil-water mixed tank (421) of the oil separation tank (420) are separated by a first partition (440), and the height of the first partition (440) is greater than the height of the separation partition (423); the oil-water mixed liquid from the intermediate tank (200) flows into the inlet tank (410); the bottom of the inlet tank (410) is provided with a first oil outlet, and the first oil outlet is installed with a first sewage valve (411); and The pipeline mechanism (500) includes pipeline components for achieving pipeline communication.

2. The sewage surface floating oil absorption and separation system according to claim 1, characterized in that: There are multiple intermediate tanks (200).

3. The sewage surface floating oil absorption and separation system according to claim 1, characterized in that: The clean water tank (430) is provided with a clean water height adjustment mechanism (432), comprising: A fixed elbow (4321), one end of which is connected to the clean water outlet (431) and the other end of which is open toward the clean water surface; A regulating tube (4322), one end of which is connected to the opening of the fixed elbow (4321) facing the liquid surface, and the other end of which is flush with the clean water surface; and The rubber ring (4323) is configured to seal the fixed elbow (4321) and the regulating tube (4322), and enables the regulating tube (4322) to slide relative to the fixed elbow (4321) in a direction perpendicular to the clean water surface.

4. The sewage surface floating oil absorption and separation system according to claim 1, characterized in that: The system further comprises a floating island (600) floating on the liquid surface of the sewage pool (10), and the pipeline mechanism (500) comprises an oil suction pipe connecting the sewage pool (10) and the intermediate tank (200), wherein one end of the oil suction pipe connected to the sewage pool (10) is installed on the floating island (600).

5. The sewage surface floating oil absorption and separation system according to claim 1, characterized in that: The pipeline mechanism (500) comprises: a water outlet pipe (530), arranged to connect the intermediate tank (200) to the oil-water separation tank (400) and having at least a portion in a spiral shape; and The return pipe (540) is configured to connect the clean water outlet (431) to the sewage tank (10).

6. A method for absorbing and separating floating oil on the surface of sewage using the system for absorbing and separating floating oil on the surface of sewage according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step S1, starting the vacuum pump (100), and when the vacuum degree in the intermediate tank (200) reaches a predetermined value, sucking the oil-water mixture in the sewage pool (10); Step S2, in response to the liquid level in the intermediate tank (200) reaching a predetermined height, allowing the oil-water mixture to flow into the oil-water separation tank (400); as well as In step S3, the floating oil flows over the separation partition (423) into the oil pool (422) and out of the oil outlet, thus achieving oil-water separation.

7. The method according to claim 6, characterized in that The step S2 comprises: In response to the upper water level detection switch detecting that the liquid level in the intermediate tank (200) reaches a predetermined height, the control valve is closed and the regulating valve is opened, so that the oil-water mixture automatically flows into the oil-water separation tank (400).

Images