Ship domestic sewage treatment equipment

Abstract

The utility model discloses ship domestic sewage treatment equipment, and belongs to the technical field of ship sewage treatment. The ship domestic sewage treatment equipment comprises a sewage treatment tank, an anaerobic tank, an anoxic tank and an aerobic tank which are sequentially communicated are formed in the sewage treatment tank, and the anoxic tank and the aerobic tank are communicated through a water pumping assembly; the water pumping assembly comprises a fixed plate, a water pumping cylinder is fixedly arranged on the fixed plate, a first interface and a second interface are formed in the water pumping cylinder, a three-way pipe is in threaded connection in the second interface, the aerobic tank and the anoxic tank are respectively communicated with two ends of the three-way pipe through two groups of one-way valves, and a driving part for driving the water pumping cylinder to pump water is arranged on the fixed plate; the water pumping cylinder is driven by the power air cylinder to act, the self-suction capacity is achieved, the power air cylinder can be controlled through a PLC program to adjust flow, the working condition of micro flow can be met while a large pipe diameter is used, and the blocking problem of a small-pipe-diameter metering pump is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of ship sewage treatment, in particular to ship domestic sewage treatment equipment. Background Art

[0002] Ship pollution primarily refers to the pollution caused by ships to the surrounding water and atmospheric environments during navigation, port calls, and cargo loading and unloading. The main pollutants are oily wastewater, domestic sewage, and ship garbage. Domestic sewage generated by ships during navigation is primarily divided into blackwater and graywater, depending on its source and quality. Blackwater is wastewater containing human and animal excreta, such as feces, and contains a significant amount of solids and floating debris. Graywater refers to other wastewater generated on board ships, including shower water, washing water, and kitchen wastewater. With the rapid development of the shipping industry in recent years, the direct discharge of substandard domestic sewage from ships has led to environmental degradation in oceans and rivers. To reduce the impact of domestic sewage on river and ocean water quality and promote a greener environment, the International Maritime Organization and my country have successively introduced various regulations to strictly control the discharge of domestic sewage from ships. This has also promoted the development of the domestic sewage treatment industry and technology. Therefore, domestic sewage treatment equipment is often installed on ships.

[0003] After sewage treatment, the nitrogen and phosphorus content in wastewater must meet standards before it can be discharged. Currently, the mainstream nitrogen removal method is biological denitrification, a process in which microorganisms reduce nitrate nitrogen (NO₃--N) and nitrite nitrogen (NO₂--N) to gaseous nitrogen under anaerobic or hypoxic conditions. The microorganisms involved in this process are called denitrifying bacteria, a type of facultative anaerobic microorganism. These microorganisms are attached to activated sludge. In the anaerobic-anoxic-aerobic treatment process, the nitrified liquid containing activated sludge at the end of the aerobic tank must be returned to the anaerobic tank to ensure sufficient microorganisms in the anaerobic environment for denitrification and achieve optimal phosphorus removal. According to process calculations, the nitrified liquid return flow rate is very low. However, the smaller the flow rate of a typical pump, the smaller the inlet and outlet pipe diameters. Because the nitrified liquid contains activated sludge, a small pump inlet diameter can cause clogging. Therefore, a nitrified liquid return pump with a low flow rate and large inlet and outlet pipe diameters is required. Utility Model Content

[0004] The utility model aims to solve the problem in the prior art that activated sludge is contained in the nitrification liquid and the pump inlet pipe diameter is too small to cause blockage, and proposes a ship domestic sewage treatment device.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A domestic sewage treatment device for a ship comprises a sewage treatment tank, wherein an anaerobic tank, an anoxic tank and an aerobic tank which are connected in sequence are provided in the sewage treatment tank, wherein the anoxic tank and the aerobic tank are connected via a pumping assembly; wherein the pumping assembly comprises a fixed plate, wherein a pumping cylinder is fixedly provided on the fixed plate, wherein a first interface and a second interface are provided on the pumping cylinder, wherein a three-way pipe is connected via a threaded connection to the second interface, wherein the aerobic tank and the anoxic tank are respectively connected to two ends of the three-way pipe via two sets of one-way valves, and wherein a driving part for driving the pumping cylinder to pump water is provided on the fixed plate.

[0007] In order to facilitate the driving of the water pumping cylinder, preferably, the driving part includes a power cylinder fixedly arranged on the fixed plate, the output end of the power cylinder is threadedly connected to a straight rod, a piston is slidingly arranged in the water pumping cylinder, a piston rod is fixedly arranged on the piston, a Y-shaped rod is fixedly arranged on the end of the piston rod extending out of the water pumping cylinder, and the end of the straight rod away from the power cylinder is rotatably connected to the Y-shaped rod.

[0008] In order to facilitate the control of the reciprocating sliding of the output end of the power cylinder, an air pump is further included. The power cylinder is connected to the air pump through an electromagnetic reversing valve, and a control box is provided on the sewage treatment tank, and the control box is electrically connected to the electromagnetic reversing valve.

[0009] In order to facilitate the connection between the power cylinder and the electromagnetic reversing valve, further, a first pipe and a second pipe are fixedly provided on the power cylinder, and the first pipe and the second pipe are respectively connected to the A port and the B port of the electromagnetic reversing valve, and the air pump is connected to the P port of the electromagnetic reversing valve.

[0010] Preferably, the one-way valve includes an inlet one-way valve and a drain one-way valve, the inlet one-way valve is connected to the aerobic tank through a first return pipe, and the drain one-way valve is connected to the anoxic tank through a second return pipe.

[0011] Preferably, the sewage treatment tank is provided with a regulating tank, a secondary sedimentation tank and a coagulation tank, the regulating tank is connected to the anaerobic tank, the secondary sedimentation tank is connected to the coagulation tank, and the aerobic tank is connected to the secondary sedimentation tank.

[0012] Compared with the existing technology, the present invention provides a ship sewage treatment equipment with the following beneficial effects:

[0013] 1. The domestic sewage treatment equipment on board uses a power cylinder to drive the pumping cylinder, has self-priming ability, and can adjust the flow rate by controlling the power cylinder through the PLC program. It can meet the working conditions of small flow while using a large diameter pipe, solving the clogging problem of small diameter metering pumps.

[0014] 2. The ship's domestic sewage treatment equipment can improve the sewage treatment effect and the clarity of the effluent by sequentially arranging a regulating tank, an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank and a coagulation tank in the sewage treatment tank.

[0015] The parts not involved in this device are the same as the existing technology or can be implemented by using the existing technology. The utility model has self-priming ability by driving the water pumping cylinder through the power cylinder, and the power cylinder can be controlled by the PLC program to adjust the flow rate. It can meet the working conditions of small flow while using a larger pipe diameter, and solve the blockage problem of small-diameter metering pumps. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of a ship domestic sewage treatment equipment proposed by the utility model;

[0017] Figure 2 This is a structural diagram of a pumping assembly for a ship's domestic sewage treatment equipment proposed in the utility model;

[0018] Figure 3 This is a cross-sectional view of a pumping cylinder of a ship sewage treatment equipment proposed in the utility model;

[0019] Figure 4 This is a rear view of a pumping assembly of a ship domestic sewage treatment equipment proposed by the utility model.

[0020] In the figure: 1. Fixed plate; 2. Power cylinder; 3. First pipeline; 4. Solenoid reversing valve; 5. Second pipeline; 6. Water inlet check valve; 7. Water pumping cylinder; 8. Tee pipe; 9. Drain check valve; 10. Straight rod; 11. Y-shaped rod; 12. Sewage treatment tank; 13. Equalization tank; 14. Anaerobic tank; 15. Anoxic tank; 16. Aerobic tank; 17. Secondary sedimentation tank; 18. Coagulation tank; 19. Air pump; 20. Control box. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0023] Example:

[0024] Reference Figure 1-Figure 3 A ship domestic sewage treatment equipment includes a sewage treatment tank 12, in which an anaerobic tank 14, an anoxic tank 15 and an aerobic tank 16 are provided, which are connected in sequence. The anoxic tank 15 and the aerobic tank 16 are connected by a pumping component. When the pumping component is working, the nitrified liquid in the aerobic tank 16 can be pumped out and then transported to the anoxic tank 15. The sewage treatment tank 12 is provided with a regulating tank 13, a secondary sedimentation tank 17 and a coagulation tank 18. The regulating tank 13 is connected to the anaerobic tank 14, the secondary sedimentation tank 17 is connected to the coagulation tank 18, and the aerobic tank 16 is connected to the secondary sedimentation tank 17. First, the sewage enters the regulating tank 13, and its main function is to regulate the water volume and water quality of the incoming water to ensure the stable operation of the subsequent treatment process. The regulating tank 13 can also remove some suspended matter to reduce the burden on the subsequent treatment units. The effluent from the regulating tank 13 then flows into the anaerobic tank 14, where microorganisms undergo metabolic processes under anaerobic conditions, primarily through hydrolysis and acidification, converting large organic molecules into small organic acids. This process also promotes phosphorus release, facilitating subsequent phosphorus removal. The effluent from the anaerobic tank 14 then flows into the anoxic tank 15. In this anoxic environment, obligate heterotrophic microorganisms use nitrates in the wastewater as electron acceptors to perform denitrification, reducing nitrates to nitrogen gas and achieving nitrogen removal while also further degrading some organic matter. The water from the anoxic tank 15 flows into the aerobic tank 16. Under aerobic conditions, aeration increases dissolved oxygen, enabling aerobic microorganisms (such as activated sludge) to fully engage in aerobic respiration, efficiently degrading organic matter. Nitrification converts ammonia nitrogen into nitrates, while simultaneously absorbing and concentrating phosphorus. The mixed liquor (including activated sludge) treated in the aerobic tank 16 enters the secondary sedimentation tank 17, where it is separated by gravity. The activated sludge sinks and is partially returned to the aeration tank, with the supernatant discharged as preliminarily treated water. This process not only achieves mud-water separation but also maintains biomass balance within the system. To further improve effluent quality, a coagulation tank 18 is connected to the secondary sedimentation tank 17. Coagulants and flocculants are added to the coagulation tank 18. Through mixing and flocculation, fine suspended matter and colloids are removed, further improving effluent clarity.

[0025] Reference Figure 2 and Figure 3The pumping assembly includes a fixed plate 1, on which a pumping cylinder 7 is fixedly arranged, and a first interface and a second interface are provided on the pumping cylinder 7, and a three-way pipe 8 is connected to the aerobic tank 16 and the anoxic tank 15 through two sets of one-way valves respectively and connected to the two ends of the three-way pipe 8. The diameter of the three-way pipe 8 is much larger than that of a water pump with the same flow rate, which avoids the situation of sludge blockage. A driving part for driving the pumping cylinder 7 to pump water is provided on the fixed plate 1. When in use, the pumping cylinder 7 is driven by the driving part to operate, and the nitrification liquid in the aerobic tank 16 can be pumped into the pumping cylinder 7 through the one-way valve at one end of the three-way pipe 8, that is, the water inlet one-way valve 6. Then the pumping cylinder 7 reverses its action and can transport the nitrification liquid through the drainage one-way valve 9 to the anoxic tank 15. It has self-priming ability, no installation direction requirement, compact structure, and is very convenient for integration into a small test device.

[0026] Reference Figure 1-Figure 3 The driving part can use a hydraulic cylinder or an electric telescopic cylinder to drive the water pumping cylinder 7 to move back and forth. Here, we design the driving part as follows: a power cylinder 2 is fixedly arranged on the fixed plate 1. The power cylinder 2 is an ordinary cylinder, which is composed of ordinary cylinders and accessories. The structure is very reliable and has a low failure rate. In addition, it is very easy to check and repair when a failure occurs, and can meet the working conditions of long-term uninterrupted operation. A straight rod 10 is threadedly connected to the output end of the power cylinder 2, and a piston is slidingly arranged in the water pumping cylinder 7. A piston rod is fixed on the piston, and a Y-shaped rod 11 is fixed on the end of the piston rod extending out of the water pumping cylinder 7. The end of the straight rod 10 away from the power cylinder 2 is rotatably connected to the Y-shaped rod 11. When in use, by starting the power cylinder 2, the piston can be driven to slide back and forth in the water pumping cylinder 7 through the straight rod 10 and the Y-shaped rod 11, thereby performing water pumping and drainage actions.

[0027] Reference Figure 1 and Figure 2 The power cylinder 2 is connected to the air pump 19 through the electromagnetic reversing valve 4, and a control box 20 is installed on the sewage treatment tank 12. The control box 20 is preferably equipped with a PLC controller, which electrically connects the control box 20 to the electromagnetic reversing valve 4. In other words, the PLC controller is used to control the operation of the electromagnetic reversing valve 4. The power cylinder 2 is controlled by the PLC program to cycle the number of times per unit time. It is connected to the water pumping cylinder 7 through the straight rod 10 and the Y-shaped rod 11 to provide power for its work. During operation, the power cylinder 2 drives the piston of the water pumping cylinder 7 to generate negative and positive pressures alternately inside. When negative pressure is generated, the water inlet check valve 6 opens and the water discharge check valve 9 closes. The negative pressure work draws the nitrified liquid into the cylinder through the pumping pipeline. When positive pressure is generated, the water inlet check valve 6 closes and the water discharge check valve 9 opens. The positive pressure work discharges the nitrified liquid in the cylinder through the drainage pipeline, and this process repeats.

[0028] Reference Figure 2 and Figure 3A first pipe 3 and a second pipe 5 are fixedly provided on the power cylinder 2. The first pipe 3 and the second pipe 5 are respectively connected to the A port and the B port of the electromagnetic reversing valve 4, and the air pump 19 is connected to the P port of the electromagnetic reversing valve 4, so as to facilitate the reciprocating movement of the power cylinder 2 through the electromagnetic reversing valve 4.

[0029] Reference Figure 1-Figure 3 The two sets of one-way valves include an inlet one-way valve 6 and a drain one-way valve 9. The inlet one-way valve 6 is connected to the aerobic tank 16 through a first return pipe, and the drain one-way valve 9 is connected to the anoxic tank 15 through a second return pipe. When in use, the nitrification liquid in the aerobic tank 16 can be extracted through the inlet one-way valve 6, and then the nitrification liquid is transported into the anoxic tank 15 through the drain one-way valve 9.

[0030] In the present invention, the power cylinder 2 and the water pumping cylinder 7 are connected by a straight rod 10 and a Y-shaped rod 11, and power is transmitted therethrough. This transmission method has a stable and reliable structure and high transmission efficiency. The air source is intermittently distributed to the first pipe 3 and the second pipe 5 by the electromagnetic reversing valve 4. When the second pipe 5 receives air, the power piston retracts, and power is transmitted to the water pumping cylinder 7 by the straight rod 10 and the Y-shaped rod 11. The piston of the water pumping cylinder 7 extends, and the volume inside the cavity increases, generating negative pressure. At this time, the water inlet check valve 6 opens, and the water discharge check valve 9 closes. The negative pressure works to draw the nitrified liquid into the cavity, completing the water pumping action.

[0031] When air is drawn from first pipe 3, the piston of power cylinder 2 pushes out. Power is transmitted to pumping cylinder 7 via straight rod 10 and Y-shaped rod 11, causing the piston of pumping cylinder 7 to retract. This reduces the volume within the chamber and generates positive pressure. This closes inlet check valve 6 and opens outlet check valve 9. The positive pressure forces the nitrification fluid within the chamber into anoxic tank 15, completing the drainage process. The minimum diameter of the inlet and outlet pipes is 15 mm, while the maximum diameter of other pumps with the same flow rate is 5 mm. This optimization solves the problem of activated sludge clogging the pipes during nitrification liquid return.

[0032] The design flow rate Q of the utility model is determined by the diameter D of the water pumping cylinder 7, the power cylinder 2L and the number of cycles k per unit time of the power cylinder 2. The basic relationship is as follows:

[0033]

[0034] Among them, the number of cylinder action cycles per unit time is controlled by the PLC program.

[0035] in:

[0036]

[0037] Through the above design, the flow rate Q can be adjusted within the range of zero to the design upper limit, and theoretically it is stepless adjustment, which makes it convenient to adjust the reflux ratio according to actual conditions during the treatment process.

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

Claims

1. A ship sewage treatment device, comprising a sewage treatment tank (12), characterized in that: The sewage treatment pool (12) is provided with an anaerobic pool (14), an anoxic pool (15) and an aerobic pool (16) which are connected in sequence, and the anoxic pool (15) and the aerobic pool (16) are connected via a pumping assembly; The pumping assembly comprises a fixed plate (1), a pumping cylinder (7) is fixedly provided on the fixed plate (1), a first interface and a second interface are provided on the pumping cylinder (7), a three-way pipe (8) is connected to the inner thread of the second interface, the aerobic pool (16) and the anoxic pool (15) are respectively connected to the two ends of the three-way pipe (8) through two sets of one-way valves, and a driving unit for driving the pumping cylinder (7) to pump water is provided on the fixed plate (1).

2. A ship sewage treatment equipment according to claim 1, characterized in that: The driving part comprises a power cylinder (2) fixedly arranged on the fixed plate (1), the output end of the power cylinder (2) is threadedly connected to a straight rod (10), a piston is slidably arranged in the water pumping cylinder (7), a piston rod is fixedly arranged on the piston, a Y-shaped rod (11) is fixedly arranged on one end of the piston rod extending outside the water pumping cylinder (7), and the end of the straight rod (10) away from the power cylinder (2) is rotatably connected to the Y-shaped rod (11).

3. A ship sewage treatment equipment according to claim 2, characterized in that: It also includes an air pump (19), the power cylinder (2) is connected to the air pump (19) through the electromagnetic reversing valve (4), and a control box (20) is provided on the sewage treatment tank (12), and the control box (20) is electrically connected to the electromagnetic reversing valve (4).

4. A ship sewage treatment equipment according to claim 3, characterized in that: A first pipe (3) and a second pipe (5) are fixedly provided on the power cylinder (2), the first pipe (3) and the second pipe (5) are respectively connected to the A port and the B port of the electromagnetic reversing valve (4), and the air pump (19) is connected to the P port of the electromagnetic reversing valve (4).

5. A ship sewage treatment equipment according to claim 1, characterized in that: The one-way valve comprises a water inlet one-way valve (6) and a water outlet one-way valve (9). The water inlet one-way valve (6) is connected to the aerobic tank (16) via a first return pipe, and the water outlet one-way valve (9) is connected to the anoxic tank (15) via a second return pipe.

6. A ship sewage treatment equipment according to claim 1, characterized in that: The sewage treatment tank (12) is provided with a regulating tank (13), a secondary sedimentation tank (17) and a coagulation tank (18); the regulating tank (13) is connected to the anaerobic tank (14); the secondary sedimentation tank (17) is connected to the coagulation tank (18); and the aerobic tank (16) is connected to the secondary sedimentation tank (17).

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