Marine sewage treatment device and sewage treatment system

Abstract

The invention discloses a marine sewage treater and a sewage treatment system, and relates to the technical field of sewage treatment.The marine sewage treater comprises a tank body, the tank body is provided with a sewage inlet, a purified water outlet and an oil stain outlet, a center cylinder and a spiral flow guide pipe are arranged in the tank body, and the top end of the spiral flow guide pipe is communicated with the sewage inlet; the bottom end of the spiral flow guide pipe is communicated with the central cylinder, a partition plate is fixedly arranged in the tank body, the spiral flow guide pipe and the central cylinder both penetrate through the partition plate, the partition plate is of a net surface structure, a filler layer is arranged in the tank body and located above the partition plate, and the purified water outlet is communicated with the space below the partition plate. And the oil stain outlet is formed in a position close to the top of the tank body. According to the device, oil stains and other suspended impurities in the flue gas washing water are efficiently and reliably cleaned, and it is guaranteed that the treated water quality meets the emission standard, so that the marine environment is protected.

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: 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.

[0007] Optionally, a medicine box is also provided on the tank body, in which flocculating agent is stored, and the medicine box is connected to a medicine delivery pipe, which is connected to the spiral guide pipe, and the connecting end of the medicine delivery pipe and the spiral guide pipe is close to the top of the spiral guide pipe. A dosing pump is provided on the medicine delivery pipe for delivering the flocculating agent in the medicine box to the spiral guide pipe.

[0008] Optionally, the central column is cylindrical, and the spiral guide pipe is used to transport sewage into the central column along the tangential direction of the central column.

[0009] Optionally, the spiral radius of the spiral flow guide tube gradually increases from the middle to both sides.

[0010] Optionally, a spiral guide plate is provided on the inner wall of the central column along the axial direction of the central column, and the spiral direction of the spiral guide plate is the same as the flow direction of the sewage when it enters the central column.

[0011] Optionally, an air pump is further provided on the tank body, and the air pump is connected to a gas delivery pipe. A gas distributor is provided at the bottom position of the central column, and the gas delivery pipe is connected to the gas distributor.

[0012] In the second aspect, the present application provides a marine sewage treatment system, which adopts the following technical solution: A marine sewage treatment system, comprising a marine sewage treatment device, a sewage storage bin and an adsorption cylinder, wherein the sewage storage bin is used to store flue gas washing water, the sewage storage bin is connected to a water delivery pipeline, the water delivery pipeline is connected to a sewage inlet, and a water supply pump is arranged on the water delivery pipeline; The adsorption cylinder is connected with a water inlet pipe and a drain pipe. The water inlet pipe is connected with the clean 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 water. One end of the drain pipe extends to the bottom of the organic clay.

[0013] Optionally, the water supply pipeline is also connected to a clean drain pipe, and a three-way valve A is provided at the connecting end of the clean drain pipe and the water supply pipeline. The three-way valve A is provided with a first detection device for detecting the oil content in sewage, and the first detection device is electrically connected to the three-way valve A.

[0014] Optionally, the drain pipe is connected to a return pipe, which is connected to a sewage storage tank. A three-way valve B is provided at the connecting end of the return pipe and the drain pipe. A second detection device for detecting the oil content in the water is provided on the drain pipe and between the three-way valve B and the adsorption cylinder. The second detection device is electrically connected to the three-way valve B.

[0015] Optionally, the oil outlet is connected to a slag discharge pipe, the slag discharge pipe is connected to a sedimentation tank, the middle part of the sedimentation tank is connected to a return pipe and an oil overflow pipe, the return pipe is connected to a sewage storage bin, and a valve is provided on the oil overflow pipe.

[0016] In summary, the present application includes at least one of the following beneficial technical effects: 1. The marine sewage treatment device of the present application can efficiently and reliably treat the flue gas washing water on board; specifically, after the sewage enters from the sewage inlet, it is guided to the central cylinder through the spiral guide tube. During the flow of sewage in the spiral guide tube, the centrifugal force is used to effectively separate the oil and water. After that, the sewage enters the tank body through the central cylinder, and the oil pollution gathers at the top of the tank body in the tank body, and is finally discharged through the oil pollution outlet. The water after the oil and water separation is filtered through the packing layer below and discharged from the clean water outlet, realizing the efficient and reliable cleaning of oil pollution and other suspended impurities in the flue gas washing water, ensuring that the treated water quality meets the emission standards, thereby protecting the marine environment.

[0017] 2. In the present application, the flocculant in the agent box is transported to the spiral guide tube through a dosing pump, and as the sewage flows in the spiral guide tube, with the help of centrifugal force, the flocculant can be fully mixed with the sewage in the spiral guide tube, thereby effectively promoting the small oil droplets and suspended matter in the sewage to coagulate into larger particles, improving the oil-water separation effect, and enhancing the oil-water separation efficiency.

[0018] 3. The present application adopts the special structural design of the spiral guide tube. Since the spiral radius at the upper and lower ends of the spiral guide tube is larger than that in the middle position, when the sewage enters the spiral guide tube, the water flow can be guided evenly and stably, reducing the impact force of the water flow on the spiral guide tube; when the sewage enters the middle position of the spiral guide tube, the spiral radius of the spiral guide tube is reduced, which can increase the impact inside the water flow and improve the mixing effect of the flocculant and sewage; thereafter, before the sewage enters the central column, the spiral radius of the spiral guide tube gradually increases, so that the sewage can form a more uniform vortex when entering the central column, thereby enhancing the effect of oil-water separation in the sewage.

[0019] 4. This application sets a second detection device on the drainage pipe. The second detection device is located between the three-way valve B and the adsorption cylinder, which can monitor the oil content in the water in real time to ensure that the water quality meets the discharge standard. When it is detected that the oil content in the water exceeds the standard, the connection direction of the three-way valve B can be automatically adjusted to guide the unqualified water to the return pipe, and the sewage is sent back to the sewage storage tank for re-circulation, avoiding the direct discharge of unqualified water and improving the reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1This is a schematic diagram of the overall structure of a marine sewage treatment device according to Example 1 of the present application; Figure 2 This is an overall process flow chart of a marine sewage treatment system according to Example 2 of the present application.

[0021] Explanation of the reference numerals in the accompanying drawings: 1. tank body; 11. sewage inlet; 12. clean water outlet; 13. oil outlet; 14. partition; 15. packing layer; 16. air pump; 17. gas delivery pipe; 18. slag discharge pipe; 2. central column; 21. spiral guide plate; 22. gas distributor; 3. spiral guide pipe; 4. reagent box; 41. reagent delivery pipe; 42. dosing pump; 5. sewage storage bin; 51. water pipeline; 52. water supply pump; 53. clean 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 pipe; 72. oil overflow pipe; 73. valve. DETAILED DESCRIPTION

[0022] The following will be combined with the attached Figure 1 -Attached Figure 2 , the technical solutions in the embodiments of the present invention are 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 work, and these embodiments are also within the scope of protection of the present invention.

[0023] The inventor of this application found that existing ship sewage treatment equipment usually uses physical separation and chemical treatment methods to purify the flue gas washing sewage on board. However, 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. To this end, this application adopts and discloses a ship sewage treatment device and sewage treatment system, which mainly adopts the following scheme:

[0024] Example 1 Example 1 of the present application discloses a marine sewage treatment device. Figure 1, including a tank body 1, on which a sewage inlet 11, a clean water outlet 12 and an oil outlet 13 are arranged. The sewage inlet 11 and the oil outlet 13 are arranged near the top of the tank body 1, and the clean water outlet 12 is arranged near the bottom of the tank body 1. A central cylinder 2 and a spiral guide pipe 3 are arranged in the tank body 1. 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 2. A partition 14 is fixedly arranged in the tank body 1, and the spiral guide pipe 3 and the central cylinder 2 both penetrate the partition 14. The partition 14 is a mesh structure. A packing layer 15 is arranged in the tank body 1 and above the partition 14, and the clean water outlet 12 is communicated with the space below the partition 14.

[0025] The tank body 1 can be made of stainless steel, which has the characteristics of strong corrosion resistance. The central column 2 is a vertical tubular structure fixed in the tank body 1, which plays the role of guiding the water flow. It is usually made of metal material with a smooth surface to reduce water flow resistance. The packing layer 15 is a porous medium used to filter the sediment in the water. Commonly used packings include quartz sand, activated carbon, etc.

[0026] Reference Figure 1 A reagent box 4 is fixedly arranged at the top of the tank body 1, and a flocculating agent is stored in the reagent box 4. The flocculating agent can be selected from materials such as polyacrylamide or polyaluminium chloride, and has a good flocculating effect. The reagent box 4 is connected to a reagent delivery pipe 41, and the reagent delivery pipe 41 is connected to the spiral guide pipe 3, and the connecting end of the reagent delivery pipe 41 and the spiral guide pipe 3 is close to the top of the spiral guide pipe 3. A dosing pump 42 is arranged on the reagent delivery pipe 41. The flocculating agent in the reagent box 4 is delivered to the spiral guide pipe 3 by the dosing pump 42, and as the sewage flows in the spiral guide pipe 3, with the help of centrifugal force, the flocculating agent can be fully mixed with the sewage in the spiral guide pipe 3, thereby effectively promoting the fine oil droplets and suspended matter in the sewage to condense into larger particles, improving the oil-water separation effect, and enhancing the oil-water separation efficiency.

[0027] Reference Figure 1 The central column 2 is cylindrical, and when the spiral guide pipe 3 conveys sewage to the central column 2, the sewage enters along the tangential direction of the central column 2, thereby forming a vortex inside the central column 2, reducing the impact force inside the water flow, and avoiding to the greatest extent the dispersion of the oil pollution that has accumulated in the sewage. The formation of this vortex enhances the effect of centrifugal force, which significantly improves the oil-water separation effect in the sewage.

[0028] Reference Figure 1The 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 the sewage when it enters the central cylinder 2. This design can further enhance the swirl effect of the sewage in the central cylinder 2, making the oil-water separation in the sewage more complete, improving the separation efficiency, ensuring better quality of the treated water, and at the same time reducing the energy consumption during the operation of the equipment and improving the overall performance of the system.

[0029] Reference Figure 1 , the spiral radius of the spiral guide tube 3 gradually increases from the middle to the upper and lower ends. Through the special structural design of the spiral guide tube 3, when the sewage enters the spiral guide tube 3, the water flow can be evenly and stably guided to reduce the impact of the water flow on the spiral guide tube 3; when the sewage enters the middle position of the spiral guide tube 3, the spiral radius of the spiral guide tube 3 is reduced, which can increase the impact inside the water flow and improve the mixing effect of the flocculation agent and the sewage; afterwards, before the sewage enters the central cylinder 2, the spiral radius of the spiral guide tube 3 gradually increases, so that the sewage can form a more uniform vortex when entering the central cylinder 2, thereby enhancing the effect of oil-water separation in the sewage.

[0030] Reference Figure 1 The side wall of the tank body 1 is fixedly provided with an air pump 16, which 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; the air pump 16 can deliver gas to the gas distributor 22 at the bottom of the central column 2 through the gas delivery pipe 17, and the gas distributor 22 releases the gas evenly into the central column 2, thereby forming a large number of tiny bubbles in the sewage, which can adhere to the surface of oil droplets and suspended particles in the sewage, increase their buoyancy, and further promote the oil-water separation effect. At the same time, the rising movement of the bubbles can also play a stirring role, which helps to fully mix the flocculation agent with the sewage and improve the treatment efficiency.

[0031] The implementation principle of a marine sewage treatment device in Example 1 of the present application is as follows: after the sewage enters from the sewage inlet 11, it is guided to the central cylinder 2 through the spiral guide tube 3. During the flow of sewage in the spiral guide tube 3, the centrifugal force is used to effectively separate the oil and water. After that, the sewage enters the tank body 1 through the central cylinder 2, and the oil is collected at the top of the tank body 1 in the tank body 1, and finally discharged through the oil outlet 13. The water after the oil and water separation is filtered through the filler below and discharged from the clean water outlet 12, realizing efficient and reliable cleaning of oil and other suspended impurities in the flue gas washing water, ensuring that the treated water quality meets the emission standards, thereby protecting the marine environment.

[0032] Example 2 Embodiment 2 of the present application also discloses a marine sewage treatment system, referring to Figure 2, including the marine sewage treatment device of embodiment 1, and also including a sewage storage bin 5 and an adsorption cylinder 6. The sewage storage bin 5 is used to store flue gas washing water. The sewage storage bin 5 is connected with a water delivery pipe 51, which is connected with a sewage inlet 11, and a water supply pump 52 is arranged on the water delivery pipe 51; the adsorption cylinder 6 is connected with a water inlet pipe 61 and a drain pipe 62, the water inlet pipe 61 is connected with a clean water outlet 12, and a booster pump 63 is arranged on the water inlet pipe 61. Organic clay 64 is arranged in the adsorption cylinder 6, and one end of the drain pipe 62 extends to the bottom of the organic clay 64.

[0033] The 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 the flue gas washing water and transport it to the marine sewage treatment device through the water pipe 51 for preliminary treatment, ensuring that the oil and suspended matter in the sewage are effectively separated. The organic clay in the adsorption cylinder 6 further adsorbs the emulsified oil in the water to improve the water purification effect. The whole system is reasonably designed to ensure that the treated water meets the discharge standards and reduces the impact on the marine environment.

[0034] Reference Figure 2 The water supply pipeline 51 is also connected to a clean drain pipe 53. A three-way valve A54 is provided at the connecting end of the clean drain pipe 53 and the water supply 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 adopts an oil-water mixed flow meter, referred to as an oil mixing meter. When the oil content in the sewage is low, the first detection device 55 can monitor in real time and feedback the signal to the three-way valve A54, so that the sewage is directly discharged through the clean drain pipe 53, avoiding unnecessary processing procedures, 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 supply pipeline 51 to ensure that the sewage enters the ship sewage treatment device for treatment and ensures that the discharged water quality meets the standards.

[0035] Reference Figure 2 The drain pipe 62 is connected to a return pipe 65, and the return pipe 65 is connected to the sewage storage bin 5. A three-way valve B66 is provided at the connecting 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 adopts an oil-water mixed flow meter. The second detection device 67 can realize real-time monitoring of the oil content in the treated water to ensure that the water quality meets the discharge standard. 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 then sent back to the sewage storage bin 5 for circulation treatment, so as to avoid the direct discharge of unqualified water, thereby improving the reliability and treatment effect of the system.

[0036] Reference Figure 2 The oil outlet 13 is connected to a slag discharge pipe 18, and the slag discharge pipe 18 is connected to a sedimentation tank 7. When the oil in the tank body 1 accumulates to a certain amount, the booster pump 63 is turned off and the water inlet outlet is sealed. After that, sewage is continuously transported into the tank body 1, and the oil is discharged from the oil outlet 13 and enters the sedimentation tank 7 through the slag discharge pipe 18, where it is further separated and precipitated.

[0037] Reference Figure 2 The middle part of the sedimentation tank 7 is connected with a return pipe 71 and an oil overflow pipe 72. The return pipe 71 is connected with the sewage storage tank 5, and a valve 73 is provided on the oil overflow pipe 72. Since the oil will carry a large amount of sewage when entering the sedimentation tank 7, the excess water in the sedimentation tank 7 can flow back to the sewage storage tank 5 through the return pipe 71. When the oil in the sedimentation tank 7 reaches a certain amount, the oil can be discharged through the oil overflow pipe 72 by opening the valve 73, and then collected and processed.

[0038] The ship sewage treatment system provided in this embodiment improves the overall performance and reliability of the system by reasonably configuring the sewage storage tank 5, the adsorption cylinder 6 and related accessories, realizes the efficient treatment and renewable utilization of shipboard oily wastewater, ensures that the treated water quality meets the emission standards, protects the marine environment, and meets the environmental protection requirements of the shipbuilding industry.

[0039] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present 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 oily waste 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 oily waste outlet (13) is provided at a position close to the top of the tank body (1).

2. A marine sewage treatment device according to claim 1, characterized in that: The tank body (1) is also provided with a medicine box (4), in which a flocculating agent is stored. The medicine box (4) is connected to a medicine delivery pipe (41), and the medicine delivery pipe (41) is connected to the spiral flow guide pipe (3). 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). 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).

3. A marine sewage treatment device according to claim 2, 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).

4. A marine sewage treatment device according to claim 3, characterized in that: The spiral radius of the spiral flow guide tube (3) gradually increases from the middle to both sides.

5. A marine sewage treatment device according to claim 4, 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).

6. 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).

7. 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 6, 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).

8. A marine sewage treatment system according to claim 7, 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).

9. A marine sewage treatment system according to claim 7, 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).

10. A marine sewage treatment system according to claim 7, 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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