Ship domestic sewage treatment equipment

Abstract

The invention 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 the 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 present invention relates to the technical field of ship sewage treatment, and in particular to a ship domestic sewage treatment device. Background Art

[0002] Ship pollution mainly refers to the pollution caused by ships to the surrounding water environment and atmospheric environment during navigation, berthing at ports, and loading and unloading of cargo. The main pollutants are oily sewage, domestic sewage, and ship garbage. The domestic sewage generated by ships during navigation is mainly divided into black water and gray water according to the source and water quality. Black water is wastewater containing human and animal excrement such as feces, in which there are quite a lot of solids and floating objects; gray water refers to other sewage generated on board except black water, including shower water, washing water, kitchen waste water, etc. In recent years, with the rapid development of the shipping industry, the direct discharge of domestic sewage from ships that does not meet the standards has led to the deterioration of the marine and river environment. In order to reduce the damage of domestic sewage from ships to the water quality of rivers and seas and create a green ecological environment, the International Maritime Organization and my country have also successively issued various regulations to strictly control the discharge of domestic sewage from ships, which has also promoted the development of the domestic sewage treatment industry and technology for ships. Therefore, domestic sewage treatment devices are usually installed on ships.

[0003] The nitrogen and phosphorus content in the sewage after sewage treatment needs to meet the standard before it is allowed to be discharged. The current mainstream nitrogen removal method is biological denitrification, that is, under anaerobic or hypoxic conditions, microorganisms reduce nitrate nitrogen (NO3--N) and nitrite nitrogen (NO2--N) to gaseous nitrogen. The microorganisms involved in this process are called denitrifying bacteria, which are a type of facultative anaerobic microorganisms. Microorganisms are attached to activated sludge. In the anaerobic-anoxic-aerobic treatment process, the nitrification liquid containing activated sludge at the end of the aerobic tank needs to be returned to the anaerobic tank to ensure that there are enough microorganisms in the anaerobic environment to carry out denitrification reactions and achieve the ideal phosphorus removal effect. According to process calculations, the nitrification liquid reflux flow is very small, but the smaller the flow of ordinary pumps, the smaller the inlet and outlet diameters. Because the nitrification liquid contains activated sludge, a small inlet and outlet diameter of the pump will cause blockage. Therefore, we need a nitrification liquid reflux pump with a small flow and a large inlet and outlet diameter. Summary of the invention

[0004] The purpose of the present invention is to solve the problem in the prior art that the nitrification liquid contains activated sludge and the pump inlet pipe diameter is too small to cause blockage, and to propose a ship domestic sewage treatment equipment.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: 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 internal threads of the second interface, wherein the aerobic tank and the anoxic tank are connected to two ends of the three-way pipe via two sets of one-way valves respectively, and wherein a driving unit for driving the pumping cylinder to pump water is provided on the fixed plate.

[0006] 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 with a straight rod, a piston is slidably 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.

[0007] 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 arranged on the sewage treatment tank, and the control box is electrically connected to the electromagnetic reversing valve.

[0008] In order to facilitate the connection between the power cylinder and the electromagnetic reversing valve, further, a first pipeline and a second pipeline are fixedly arranged on the power cylinder, and the first pipeline and the second pipeline 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.

[0009] Preferably, the one-way valve comprises an inlet one-way valve and a drain one-way valve, the inlet one-way valve is connected to the aerobic tank via a first return pipe, and the drain one-way valve is connected to the anoxic tank via a second return pipe.

[0010] Preferably, the sewage treatment tank is provided with a regulating tank, a secondary sedimentation tank and a coagulation tank, the regulating tank is connected with the anaerobic tank, the secondary sedimentation tank is connected with the coagulation tank, and the aerobic tank is connected with the secondary sedimentation tank.

[0011] Compared with the prior art, the present invention provides a ship domestic sewage treatment equipment, which has the following beneficial effects: 1. The domestic sewage treatment equipment of the ship is driven by the power cylinder to move 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 larger pipe diameter, and solve the blockage problem of small-diameter metering pumps; 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.

[0012] The parts not involved in the device are the same as the existing technology or can be implemented by the existing technology. The present invention 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 diameter pipe, and solve the blockage problem of small diameter metering pumps. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a structural schematic diagram of a ship domestic sewage treatment device proposed by the present invention; Figure 2 This is a structural schematic diagram of a pumping assembly for a ship domestic sewage treatment device proposed by the present invention; Figure 3 A cross-sectional view of a pumping cylinder of a ship domestic sewage treatment equipment proposed by the present invention; Figure 4 This is a rear view of a pumping assembly of a ship domestic sewage treatment equipment proposed by the present invention.

[0014] In the figure: 1. fixed plate; 2. power cylinder; 3. first pipeline; 4. electromagnetic reversing valve; 5. second pipeline; 6. water inlet check valve; 7. water pumping cylinder; 8. three-way pipe; 9. water discharge check valve; 10. straight rod; 11. Y-shaped rod; 12. sewage treatment tank; 13. regulating tank; 14. anaerobic tank; 15. anoxic tank; 16. aerobic tank; 17. second sedimentation tank; 18. coagulation tank; 19. air pump; 20. control box. DETAILED DESCRIPTION

[0015] 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.

[0016] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0017] Example: Reference Figure 1-Figure 3A 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 connected in sequence. The anoxic tank 15 and the aerobic tank 16 are connected through 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 amount and 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 of the subsequent treatment unit. Then the effluent from the regulating tank 13 flows into the anaerobic tank 14, where microorganisms metabolize under anaerobic conditions, mainly hydrolysis and acidification processes, converting large molecular organic matter into small molecular organic acids, while promoting the release of phosphorus, creating conditions for subsequent phosphorus removal. The effluent from the anaerobic tank 14 then enters the anoxic tank 15. In an anaerobic environment, the obligate heterotrophic microorganisms use the nitrate in the sewage as an electron acceptor to carry out denitrification, reducing the nitrate to nitrogen gas, achieving denitrification, and at the same time, some organic matter continues to be degraded. The water from the anoxic tank 15 flows to the aerobic tank 16. Under aerobic conditions, aeration increases dissolved oxygen, allowing aerobic microorganisms (such as activated sludge) to fully carry out aerobic respiration, efficiently degrade organic matter, and convert ammonia nitrogen into nitrate through nitrification, while completing the absorption and enrichment of phosphorus. The mixed liquor (including activated sludge) treated in the aerobic tank 16 enters the secondary sedimentation tank 17, and is separated by gravity sedimentation. The activated sludge sinks and partially flows back to the aeration tank, and the supernatant is discharged as preliminarily treated water. This process not only achieves mud-water separation, but also maintains the biomass balance in the system. In order to further improve the effluent quality, a coagulation tank 18 is connected after the secondary sedimentation tank 17. In the coagulation tank 18, coagulants and coagulants are added to remove fine suspended matter, colloids, etc. through mixing and flocculation processes, further improving the clarity of the effluent. Reference Figure 2 and Figure 3The pumping assembly includes a fixed plate 1, on which a pumping cylinder 7 is fixedly arranged, 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, and the aerobic pool 16 and the anoxic pool 15 are respectively connected to the two ends of the three-way pipe 8 through two groups of one-way valves. The diameter of the three-way pipe 8 is much larger than that of a water pump with the same flow rate, thereby avoiding 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 pool 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 and can transport the nitrification liquid to the anoxic pool 15 through the drainage one-way valve 9. It has self-priming ability, no installation direction requirement, compact structure, and is very convenient to be integrated into a small test device.

[0018] 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 reciprocate. 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 the failure rate is low. It is very easy to check and repair when a failure occurs, and can meet the long-term uninterrupted operation conditions. A straight rod 10 is threadedly connected to the output end of the power cylinder 2, and a piston is slidably arranged in the water pumping cylinder 7. A piston rod is fixedly arranged on the piston, and a Y-shaped rod 11 is fixedly arranged on the end of the piston rod extending out of 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. When in use, by starting the power cylinder 2, the piston can slide back and forth in the water pumping cylinder 7 through the straight rod 10 and the Y-shaped rod 11, so that water can be pumped and drained.

[0019] 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 set on the sewage treatment pool 12, and a PLC controller is preferably set in the control box 20, and the control box 20 is electrically connected to the electromagnetic reversing valve 4, that is, the PLC controller is used to control the action of the electromagnetic reversing valve 4. The number of cycles per unit time of the power cylinder 2 action is controlled by the PLC program, and 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; when working, the power cylinder 2 drives the piston movement of the water pumping cylinder 7 to alternately generate negative pressure and positive pressure inside it. When negative pressure is generated, the water inlet check valve 6 is opened, and the water discharge check valve 9 is closed. The negative pressure work pumps the nitrification liquid into the cylinder body through the water pumping pipeline; when positive pressure is generated, the water inlet check valve 6 is closed, and the water discharge check valve 9 is opened. The positive pressure work discharges the nitrification liquid in the cylinder body through the water discharge pipeline, and so on.

[0020] Reference Figure 2 and Figure 3A first pipeline 3 and a second pipeline 5 are fixedly arranged on the power cylinder 2. The first pipeline 3 and the second pipeline 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.

[0021] 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.

[0022] 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 by them. This transmission method has a stable and reliable structure and a high transmission efficiency. The air source is intermittently distributed to the first pipeline 3 and the second pipeline 5 by the electromagnetic reversing valve 4. When the second pipeline 5 receives air, the power piston retracts, and the 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, the volume in the cavity increases, and negative pressure is generated. At this time, the water inlet check valve 6 is opened, and the water discharge check valve 9 is closed. The negative pressure works to draw the nitrified liquid into the cavity, completing the water pumping action.

[0023] When the first pipeline 3 is energized, the piston of the power cylinder 2 is pushed out, and the 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 retracts, and the volume in the cavity becomes smaller, generating positive pressure. At this time, the water inlet check valve 6 is closed, and the water discharge check valve 9 is opened. The positive pressure works to push the nitrification fluid in the cavity into the anoxic tank 15, completing the drainage action. The minimum diameter of the inlet and outlet water pipes is 15 mm, and the maximum diameter of other pumps with the same flow rate is 5 mm. Through this optimization, the problem of activated sludge blocking the pipes during the nitrification liquid reflux process is solved.

[0024] The design flow rate Q of the present invention 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: Among them, the number of cycles per unit time of the cylinder action is controlled by the PLC program. in: 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 processing process.

[0025] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

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

3. A ship domestic 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) via an 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 domestic sewage treatment equipment according to claim 3, characterized in that: A first pipeline (3) and a second pipeline (5) are fixedly arranged on the power cylinder (2); the first pipeline (3) and the second pipeline (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 domestic 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 discharge 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 discharge one-way valve (9) is connected to the anoxic tank (15) via a second return pipe.

6. A ship domestic 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).

Images