A marine sewage processor and a sewage treatment system

Abstract

The present application discloses a marine sewage processor and a sewage treatment system, relating to the technical field of sewage treatment. It includes a tank body, and the tank body is provided with a sewage inlet, a purified water outlet, and an oil stain outlet. A central cylinder column and a spiral guide pipe are arranged inside the tank body. The top end of the spiral guide pipe is communicated with the sewage inlet, and the bottom end of the spiral guide pipe is communicated with the central cylinder column. A partition plate is fixedly arranged inside the tank body, and both the spiral guide pipe and the central cylinder column penetrate through the partition plate. The partition plate is of a mesh surface structure. A packing layer is arranged above the partition plate inside the tank body. The purified water outlet is communicated with the space below the partition plate, and the oil stain outlet is arranged at a position close to the top of the tank body. The present application realizes the efficient and reliable cleaning of oil stains and other suspended impurities in flue gas washing water, ensures that the treated water quality meets the discharge standards, and thus protects the marine environment.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to a marine sewage treatment device and a sewage treatment system. Background Art

[0002] With the improvement of global environmental awareness and the increasingly stringent sulfur oxide emission standards of the International Maritime Organization (IMO), the shipping industry is facing tremendous pressure to reduce emissions. To this end, many shipping companies have begun to install flue gas scrubbers on their ships to remove sulfur oxides from exhaust gas by seawater scrubbing. This technology not only helps to reduce air pollution, but also meets the requirements of international environmental regulations and promotes sustainable development. However, this process will produce a large amount of wastewater containing oil pollution, which needs to be treated to meet the emission standards, otherwise it will cause serious damage to the marine environment.

[0003] At present, in order to solve the problem of treating oily wastewater on board ships, the industry usually adopts a variety of methods. Common methods include physical separation and chemical treatment. Specifically, physical separation mainly includes gravity sedimentation, filtration and other methods; chemical treatment mainly achieves oil-water separation by adding chemical agents such as flocculants and demulsifiers.

[0004] However, although the above methods have solved the problem of treating shipboard oily wastewater to a certain extent, there are still some shortcomings. For example, the traditional physical separation method is difficult to efficiently remove fine oil droplets, resulting in substandard water quality after treatment; although the chemical treatment method can effectively achieve oil-water separation, a large amount of suspended matter will still remain in the water, and direct discharge may cause secondary pollution. Therefore, how to efficiently and reliably treat shipboard oily wastewater to meet strict emission standards has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] In view of the problems existing in the prior art, the present application provides a marine sewage treatment device and a sewage treatment system.

[0006] In the first aspect, the present application provides a marine sewage treatment device, which adopts the following technical solution:

[0007] A marine sewage treatment device comprises a tank body, wherein the tank body is provided with a sewage inlet, a clean water outlet and an oil outlet, wherein a central cylinder and a spiral guide tube are arranged in the tank body, wherein the top end of the spiral guide tube is communicated with the sewage inlet, and the bottom end of the spiral guide tube is communicated with the central cylinder, wherein a partition is fixedly arranged in the tank body, wherein the spiral guide tube and the central cylinder both penetrate the partition, wherein the partition is in a mesh structure, wherein a packing layer is arranged in the tank body and above the partition, wherein the clean water outlet is communicated with the space below the partition, and wherein the oil outlet is arranged near the top of the tank body.

[0008] Optionally, a chemical agent tank is further provided on the tank body. Flocculating chemicals are stored in the chemical agent tank. The chemical agent tank is communicated with a chemical agent delivery pipe, and the chemical agent delivery pipe is communicated with the spiral guide pipe. The communication end of the chemical agent delivery pipe and the spiral guide pipe is close to the top end of the spiral guide pipe. A chemical agent adding pump is arranged on the chemical agent delivery pipe for delivering the flocculating chemicals in the chemical agent tank into the spiral guide pipe.

[0009] Optionally, the central cylinder column is in a cylindrical shape, and the spiral guide pipe is used for delivering sewage tangentially along the central cylinder column into the central cylinder column.

[0010] Optionally, the spiral radius of the spiral guide pipe gradually increases from the middle to both sides.

[0011] Optionally, spiral guide plates are arranged on the inner wall of the central cylinder column along the axial direction of the central cylinder column, and the spiral direction of the spiral guide plates is the same as the flowing direction of the sewage when it enters the central cylinder column.

[0012] Optionally, an air pump is further provided on the tank body. The air pump is communicated with an air delivery pipe. A gas distributor is arranged at the bottom position of the central cylinder column. The air delivery pipe is communicated with the gas distributor.

[0013] In a second aspect, the present application provides a marine sewage treatment system, adopting the following technical solution:

[0014] A marine sewage treatment system includes a marine sewage processor, and further includes a sewage storage bin and an adsorption cylinder. The sewage storage bin is used for storing flue gas washing water. The sewage storage bin is communicated with a water delivery pipe, and the water delivery pipe is communicated with the sewage inlet. A water supply pump is arranged on the water delivery pipe;

[0015] The adsorption cylinder is communicated with a water inlet pipe and a drain pipe. The water inlet pipe is communicated with the purified water outlet. A booster pump is arranged on the water inlet pipe. Organic clay is arranged in the adsorption cylinder for adsorbing emulsified oil in the water. One end of the drain pipe extends to the bottom of the organic clay.

[0016] Optionally, the water delivery pipe is further communicated with a clean discharge pipe. A three-way valve A is arranged at the communication end of the clean discharge pipe and the water delivery pipe. A first detection device for detecting the oil content in the sewage is arranged on the three-way valve A, and the first detection device is electrically connected with the three-way valve A.

[0017] Optionally, the drain pipe is connected with a return pipe, and the return pipe is communicated with the sewage storage bin. A three-way valve B is arranged at the communication end of the return pipe and the drain pipe. A second detection device for detecting the oil content in the water is arranged on the drain pipe and between the three-way valve B and the adsorption cylinder. The second detection device is electrically connected with the three-way valve B.

[0018] Optionally, the oil pollution outlet is communicated with a slag discharge pipe, the slag discharge pipe is connected with a sedimentation tank, a water return pipe and an oil overflow pipe are communicated at the middle position of the sedimentation tank, the water return pipe is communicated with the sewage storage bin, and a valve is arranged on the oil overflow pipe.

[0019] In summary, the present application includes at least one of the following beneficial technical effects:

[0020] 1. The marine sewage processor of the present application can efficiently and reliably treat the flue gas washing water on the ship; specifically, after the sewage enters from the sewage inlet, it is guided into the central cylinder by the spiral diversion pipe. During the process of the sewage flowing in the spiral diversion pipe, the oil and water are effectively separated by the centrifugal force. Then the sewage enters the tank through the central cylinder, and the oil pollution accumulates at the top of the tank and is finally discharged through the oil pollution outlet. The water after oil-water separation is filtered through the filler layer below and discharged from the purified water outlet, realizing the efficient and reliable cleaning of the oil pollution and other suspended impurities in the flue gas washing water, ensuring that the treated water quality meets the discharge standard, and thus protecting the marine environment.

[0021] 2. The present application transports the flocculating agent in the reagent tank to the spiral diversion pipe through a dosing pump, and as the sewage flows in the spiral diversion pipe, with the help of centrifugal force, the flocculating agent can be fully mixed with the sewage in the spiral diversion pipe, thereby effectively promoting the aggregation of fine oil droplets and suspended substances in the sewage into larger particles, improving the oil-water separation effect and enhancing the oil-water separation efficiency.

[0022] 3. Through the special structural design of the spiral diversion pipe in the present application, since the spiral radii at the upper and lower ends of the spiral diversion pipe are larger than the middle position, when the sewage enters the spiral diversion pipe, it can uniformly and stably guide the water flow and reduce the impact force of the water flow on the spiral diversion pipe; when the sewage enters the middle position of the spiral diversion pipe, due to the reduction of the spiral radius of the spiral diversion pipe, the internal impact of the water flow can be increased, improving the mixing effect of the flocculating agent and the sewage; then, before the sewage enters the central cylinder, due to the gradual increase of the spiral radius of the spiral diversion pipe, the sewage can form a more uniform swirl when entering the central cylinder, thereby enhancing the oil-water separation effect in the sewage.

[0023] 4. By arranging a second detection device on the drain pipe, the second detection device is located between the three-way valve B and the adsorption cylinder, which can real-time monitor the oil content in the water and ensure that the water quality meets the discharge standard. When it is detected that the oil content in the water exceeds the standard, the communication direction of the three-way valve B can be automatically adjusted to guide the unqualified water to the return pipe and send the sewage back to the sewage storage bin for recycling, avoiding the direct discharge of unqualified water and improving the reliability of the system. Description of the Drawings

[0024] Figure 1It is a schematic diagram of the overall structure of a marine sewage processor according to Embodiment 1 of the present application;

[0025] Figure 2 It is a schematic diagram of the overall process flow of a marine sewage treatment system according to Embodiment 2 of the present application.

[0026] Description of reference numerals: 1. Tank body; 11. Sewage inlet; 12. Clean water outlet; 13. Oil pollution outlet; 14. Partition board; 15. Packing layer; 16. Air pump; 17. Gas delivery pipe; 18. Slag discharge pipe; 2. Central cylinder column; 21. Spiral guide plate; 22. Gas distributor; 3. Spiral guide pipe; 4. Chemical agent tank; 41. Chemical agent delivery pipe; 42. Chemical agent dosing pump; 5. Sewage storage bin; 51. Water delivery pipe; 52. Water supply pump; 53. Net discharge pipe; 54. Three-way valve A; 55. First detection device; 6. Adsorption cylinder; 61. Water inlet pipe; 62. Drain pipe; 63. Booster pump; 64. Organic clay; 65. Return pipe; 66. Three-way valve B; 67. Second detection device; 7. Sedimentation tank; 71. Return water pipe; 72. Oil overflow pipe; 73. Valve. Detailed implementation manners

[0027] Next, in combination with the attached Figure 1 - attached Figure 2 , the technical solutions in the embodiments of the present invention will be clearly and completely described. The described embodiments are only possible technical implementations of the present invention, not all possible implementations. Those skilled in the art can completely combine the embodiments of the present invention to obtain other embodiments without creative labor, and these embodiments are also within the protection scope of the present invention.

[0028] The inventors of the present application found that existing marine sewage treatment equipment usually uses physical separation methods and chemical treatment methods to purify the flue gas washing sewage on ships. However, traditional physical separation methods are difficult to efficiently remove fine oil droplets, resulting in unqualified treated water quality; although chemical treatment methods can effectively achieve oil-water separation, a large amount of suspended matter will still remain in the water, and direct discharge may cause secondary pollution. For this reason, the present application discloses a marine sewage processor and a sewage treatment system, mainly adopting the following solutions:

[0029] Embodiment 1

[0030] Embodiment 1 of the present application discloses a marine sewage processor. Refer to Figure 1, including a tank body 1, on which there are a sewage inlet 11, a purified water outlet 12 and an oil stain outlet 13. The sewage inlet 11 and the oil stain outlet 13 are arranged near the top of the tank body 1, and the purified water outlet 12 is arranged near the bottom of the tank body 1. Inside the tank body 1, there are a central cylinder column 2 and a spiral guide pipe 3. The top end of the spiral guide pipe 3 is communicated with the sewage inlet 11, and the bottom end of the spiral guide pipe 3 is communicated with the central cylinder column 2. A partition plate 14 is fixedly arranged inside the tank body 1. Both the spiral guide pipe 3 and the central cylinder column 2 penetrate through the partition plate 14. The partition plate 14 is in a mesh structure. Above the partition plate 14 inside the tank body 1, there is a packing layer 15. The purified water outlet 12 is communicated with the space below the partition plate 14.

[0031] The tank body 1 can be made of stainless steel material, with the characteristic of strong corrosion resistance. The central cylinder column 2 is a vertical tubular structure fixed inside the tank body 1, which plays a role in guiding the water flow. It is usually made of metal material with a smooth surface to reduce the water flow resistance. The packing layer 15 is a porous medium used to filter the sediment in the water. Common packings include quartz sand, activated carbon, etc.

[0032] Refer to Figure 1 , at the top end of the tank body 1, a medicine box 4 is fixedly arranged. In the medicine box 4, there is a flocculant stored. The flocculant can be selected from substances such as polyacrylamide or polyaluminum chloride, which have good flocculation effects. The medicine box 4 is communicated with a medicine delivery pipe 41. The medicine delivery pipe 41 is communicated with the spiral guide pipe 3, and the communicating end of the medicine delivery pipe 41 and the spiral guide pipe 3 is close to the top end of the spiral guide pipe 3. A medicine adding pump 42 is arranged on the medicine delivery pipe 41. Through the medicine adding pump 42, the flocculant in the medicine box 4 is transported into the spiral guide pipe 3. And as the sewage flows in the spiral guide pipe 3, with the help of centrifugal force, the flocculant can be fully mixed with the sewage in the spiral guide pipe 3, thereby effectively promoting the aggregation of fine oil droplets and suspended substances in the sewage into larger particles, improving the oil-water separation effect and enhancing the oil-water separation efficiency.

[0033] Refer to Figure 1 , the central cylinder column 2 is in a cylindrical shape. When the spiral guide pipe 3 transports the sewage to the central cylinder column 2, the sewage enters along the tangential direction of the central cylinder column 2, thereby forming a swirl inside the central cylinder column 2, reducing the impact force inside the water flow, and avoiding the dispersion of the oil stains that have gathered in the sewage to the greatest extent. And the formation of this swirl enhances the role of centrifugal force, making the oil-water separation effect of the sewage significantly improved.

[0034] Refer to Figure 1, a spiral guide plate 21 is arranged along the axial direction of the inner wall of the central cylinder column 2, and the spiral direction of the spiral guide plate 21 is the same as the flow direction of the sewage when it enters the central cylinder column 2. This design can further enhance the swirling effect of the sewage in the central cylinder column 2, make the oil-water separation in the sewage more sufficient, improve the separation efficiency, ensure better water quality after treatment, reduce the energy consumption during the operation of the equipment, and improve the overall performance of the system.

[0035] Refer to Figure 1 , the spiral radius of the spiral guide pipe 3 gradually increases from the middle to the upper and lower ends. Through the special structural design of the spiral guide pipe 3, when the sewage enters the spiral guide pipe 3, the water flow can be guided evenly and stably, reducing the impact force of the water flow on the spiral guide pipe 3; when the sewage enters the middle position of the spiral guide pipe 3, due to the reduction of the spiral radius of the spiral guide pipe 3, the impact inside the water flow can be increased, improving the mixing effect of the flocculant and the sewage; then, before the sewage enters the central cylinder column 2, due to the gradual increase of the spiral radius of the spiral guide pipe 3, the sewage can form a more uniform swirl when entering the central cylinder column 2, thereby enhancing the oil-water separation effect in the sewage.

[0036] Refer to Figure 1 , an air pump 16 is fixedly arranged on the side wall of the tank body 1, the air pump 16 is communicated with a gas delivery pipe 17, a gas distributor 22 is arranged at the bottom position of the central cylinder column 2, and the gas delivery pipe 17 is communicated with the gas distributor 22; the air pump 16 can transport gas through the gas delivery pipe 17 to the gas distributor 22 at the bottom of the central cylinder column 2, and the gas distributor 22 uniformly releases the gas into the central cylinder column 2, thereby forming a large number of tiny bubbles in the sewage. These bubbles can adhere to the surfaces of oil droplets and suspended particles in the sewage, increasing their buoyancy and further promoting the oil-water separation effect. At the same time, the upward movement of the bubbles can also play a stirring role, helping the flocculant and the sewage to be fully mixed and improving the treatment efficiency.

[0037] The implementation principle of the marine sewage processor in Embodiment 1 of this application is as follows: After the sewage enters from the sewage inlet 11, it is guided by the spiral guide pipe 3 into the central cylinder column 2. During the flow of the sewage in the spiral guide pipe 3, the oil and water are effectively separated by the centrifugal force. Then the sewage enters the tank body 1 through the central cylinder column 2, and the oil stain accumulates at the top of the tank body 1 in the tank body 1 and is finally discharged through the oil stain outlet 13. The water after the oil-water separation is discharged from the clean water outlet 12 after being filtered by the filler below, realizing the efficient and reliable cleaning of the oil stain and other suspended impurities in the flue gas washing water, ensuring that the water quality after treatment meets the discharge standard, and thus protecting the marine environment.

[0038] Embodiment 2

[0039] Embodiment 2 of the present application also discloses a marine sewage treatment system. Refer to Figure 2 , which includes the marine sewage processor of Embodiment 1, and further includes a sewage storage tank 5 and an adsorption cylinder 6. The sewage storage tank 5 is used to store flue gas washing water. The sewage storage tank 5 is connected to a water delivery pipeline 51, and the water delivery pipeline 51 is connected to the sewage inlet 11. A water supply pump 52 is provided on the water delivery pipeline 51; the adsorption cylinder 6 is connected to a water inlet pipe 61 and a drain pipe 62. The water inlet pipe 61 is connected to the purified water outlet 12. A booster pump 63 is provided on the water inlet pipe 61. Organic clay 64 is provided inside the adsorption cylinder 6. One end of the drain pipe 62 extends to the bottom of the organic clay 64.

[0040] This marine sewage treatment system can achieve efficient treatment and recycling of ship flue gas washing water. Specifically, the sewage storage tank 5 is used to collect flue gas washing water and transport it through the water delivery pipeline 51 to the marine sewage processor for preliminary treatment to ensure effective separation of oil and suspended matter in the sewage. The organic clay in the adsorption cylinder 6 further adsorbs emulsified oil in the water, improving the water quality purification effect. The entire system is reasonably designed to ensure that the treated water meets the discharge standards and reduces the impact on the marine environment.

[0041] Refer to Figure 2 , the water delivery pipeline 51 is also connected to a net discharge pipe 53. A three-way valve A54 is provided at the connection end of the net discharge pipe 53 and the water delivery pipeline 51. A first detection device 55 for detecting the oil content in the sewage is provided on the three-way valve A54, and the first detection device 55 is electrically connected to the three-way valve A54. The first detection device 55 uses an oil-water mixed flowmeter, abbreviated as an oil mixing meter. When the oil content in the sewage is low, the first detection device 55 can monitor and feedback signals to the three-way valve A54 in real time, enabling the sewage to be directly discharged through the net discharge pipe 53, avoiding unnecessary treatment processes, thereby improving the system operation efficiency and saving energy. When the oil content in the sewage is high, the three-way valve A54 switches to the direction of the water delivery pipeline 51 to ensure that the sewage enters the marine sewage processor for treatment and ensure that the discharged water quality meets the standards.

[0042] Refer to Figure 2 , the drain pipe 62 is connected to a return pipe 65. The return pipe 65 is connected to the sewage storage tank 5. A three-way valve B66 is provided at the connection end of the return pipe 65 and the drain pipe 62. A second detection device 67 for detecting the oil content in the water is provided on the drain pipe 62 and between the three-way valve B66 and the adsorption cylinder 6. The second detection device 67 is electrically connected to the three-way valve B66. The second detection device 67 also uses an oil-water mixed flowmeter. The second detection device 67 can achieve real-time monitoring of the oil content in the treated water to ensure that the water quality meets the discharge standards. When the oil content in the water exceeds the standard, the unqualified water can be guided to the return pipe 65 by controlling the three-way valve B66 and sent back to the sewage storage tank 5 for cyclic treatment, avoiding direct discharge of unqualified water, thereby improving the reliability and treatment effect of the system.

[0043] Refer to Figure 2 , the oil pollution outlet 13 is communicated with a slag discharge pipe 18, and the slag discharge pipe 18 is connected with a sedimentation tank 7. When the oil pollution in the tank body 1 accumulates to a certain amount, the booster pump 63 is closed, and the water inlet is sealed. Then, sewage is continuously conveyed into the tank body 1, and the oil pollution is discharged from the oil pollution outlet 13, enters the sedimentation tank 7 through the slag discharge pipe 18, and is further separated and precipitated in the sedimentation tank 7.

[0044] Refer to Figure 2 , a water return pipe 71 and an oil overflow pipe 72 are communicated with the middle position of the sedimentation tank 7. The water return pipe 71 is communicated with the sewage storage bin 5, and a valve 73 is arranged on the oil overflow pipe 72. Since a large amount of sewage will be carried when the oil pollution enters the sedimentation tank 7, the excess water in the sedimentation tank 7 can flow back into the sewage storage bin 5 through the water return pipe 71. When the oil pollution in the sedimentation tank 7 reaches a certain amount, by opening the valve 73, the oil liquid can be discharged through the oil overflow pipe 72 and collected and processed centrally.

[0045] The marine sewage treatment system provided by this embodiment improves the overall performance and reliability of the system by reasonably configuring the sewage storage bin 5, the adsorption cylinder 6 and related accessories, realizes the efficient treatment and renewable utilization of shipborne oily wastewater, ensures that the treated water quality meets the discharge standard, protects the marine environment, and meets the environmental protection requirements of the shipbuilding industry.

[0046] The above are all the preferred embodiments of this application. The protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of this application should be covered within the protection scope of this application.

Claims

1. A marine sewage treatment device, characterized in that: The invention comprises a tank body (1), wherein the tank body (1) is provided with a sewage inlet (11), a clean water outlet (12) and an oil outlet (13); a central column (2) and a spiral guide tube (3) are provided in the tank body (1); the top end of the spiral guide tube (3) is connected to the sewage inlet (11); the bottom end of the spiral guide tube (3) is connected to the central column (2); a partition (14) is fixedly provided in the tank body (1); the spiral guide tube (3) and the central column (2) both penetrate the partition (14); the partition (14) is in a mesh structure; a packing layer (15) is provided in the tank body (1) and above the partition (14); the clean water outlet (12) is connected to the space below the partition (14); and the oil outlet (13) is provided at a position close to the top of the tank body (1); The tank body (1) is also provided with a medicine box (4), wherein a flocculating agent is stored in the medicine box (4), and the medicine box (4) is connected to a medicine delivery pipe (41), wherein the medicine delivery pipe (41) is connected to the spiral flow guide pipe (3), and the connecting end of the medicine delivery pipe (41) and the spiral flow guide pipe (3) is close to the top of the spiral flow guide pipe (3), and the medicine delivery pipe (41) is provided with a dosing pump (42) for delivering the flocculating agent in the medicine box (4) to the spiral flow guide pipe (3); The spiral radius of the spiral flow guide tube (3) gradually increases from the middle to both sides.

2. A marine sewage treatment device according to claim 1, characterized in that: The central column (2) is cylindrical, and the spiral flow guide pipe (3) is used to transport sewage into the central column (2) along the tangential direction of the central column (2).

3. A marine sewage treatment device according to claim 2, characterized in that: The inner wall of the central cylinder (2) is provided with a spiral guide plate (21) along the axial direction of the central cylinder (2), and the spiral direction of the spiral guide plate (21) is the same as the flow direction of sewage when it enters the central cylinder (2).

4. A marine sewage treatment device according to claim 1, characterized in that: The tank body (1) is also provided with an air pump (16), and the air pump (16) is connected to a gas delivery pipe (17). A gas distributor (22) is provided at the bottom of the central column (2), and the gas delivery pipe (17) is connected to the gas distributor (22).

5. A marine sewage treatment system, characterized in that: A marine sewage treatment device comprising the marine sewage treatment device according to any one of claims 1 to 4, further comprising a sewage storage bin (5) and an adsorption cylinder (6), wherein the sewage storage bin (5) is used to store flue gas washing water, the sewage storage bin (5) is connected to a water delivery pipe (51), the water delivery pipe (51) is connected to a sewage inlet (11), and a water supply pump (52) is provided on the water delivery pipe (51); The adsorption cylinder (6) is connected to a water inlet pipe (61) and a drainage pipe (62); the water inlet pipe (61) is connected to a clean water outlet (12); a booster pump (63) is provided on the water inlet pipe (61); organic clay (64) is provided in the adsorption cylinder (6) for adsorbing emulsified oil in water; one end of the drainage pipe (62) extends to the bottom of the organic clay (64).

6. A marine sewage treatment system according to claim 5, characterized in that: The water delivery pipeline (51) is also connected to a clean drain pipe (53), and a three-way valve A (54) is provided at the connecting end between the clean drain pipe (53) and the water delivery pipeline (51). A first detection device (55) for detecting the oil content in the sewage is provided on the three-way valve A (54), and the first detection device (55) is electrically connected to the three-way valve A (54).

7. A marine sewage treatment system according to claim 5, characterized in that: The drain pipe (62) is connected to a return pipe (65), the return pipe (65) is in communication with the sewage storage tank (5), a three-way valve B (66) is provided at the communicating end between the return pipe (65) and the drain pipe (62), a second detection device (67) for detecting the oil content in the water is provided on the drain pipe (62) and between the three-way valve B (66) and the adsorption cylinder (6), and the second detection device (67) is electrically connected to the three-way valve B (66).

8. A marine sewage treatment system according to claim 5, characterized in that: The oily waste outlet (13) is connected to a slag discharge pipe (18), the slag discharge pipe (18) is connected to a sedimentation tank (7), the middle of the sedimentation tank (7) is connected to a return pipe (71) and an oil overflow pipe (72), the return pipe (71) is connected to a sewage storage tank (5), and a valve (73) is provided on the oil overflow pipe (72).

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