Ship domestic sewage treatment system

Abstract

The invention provides a ship domestic sewage treatment system. The ship domestic sewage treatment system comprises a domestic sewage treatment device, a domestic sewage storage cabin, a grey water collection cabin, a domestic sewage conveying pump, a shared bank drainage system, a sewage backflow system and a cleaning device. And the shared bank drainage system comprises a pipeline for connecting the domestic sewage storage cabin and the grey water collection cabin, a valve assembly and a bank joint, so that the two cabins share one set of drainage system. And the sewage backflow system enables the sewage in the domestic sewage storage cabin to enter the domestic sewage treatment device again for secondary treatment. The cleaning device is arranged in the two cabins, comprises an annular pipeline and a plurality of water spraying holes and is used for cleaning the inner wall faces of the cabins. The number of equipment is reduced, and ship space and cost are saved; the sewage treatment effect is improved, and the marine environment is better protected; cabin cleaning and maintenance are facilitated, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of ship sewage treatment, and particularly relates to a ship domestic sewage treatment system. Background Art

[0002] During the operation of a ship, a large amount of domestic sewage and grey water are generated. Domestic sewage mainly comes from areas such as toilets and medical rooms, and usually contains a relatively high concentration of organic substances and pathogens; grey water mainly comes from areas such as washrooms, kitchens, and laundries, and the pollutant concentration is relatively low. To meet the requirements of Annex IV of the International Convention for the Prevention of Pollution from Ships (MARPOL 73 / 78) of the International Maritime Organization (IMO), ships need to be equipped with corresponding sewage treatment systems.

[0003] The existing ship domestic sewage treatment systems usually have the following problems:

[0004] 1. The domestic sewage storage tank and the grey water collection tank are each equipped with an independent shore discharge system, resulting in duplicate equipment configuration, increasing the ship cost and occupied space;

[0005] 2. The sewage inside the domestic sewage storage tank cannot enter the domestic sewage treatment device again for secondary treatment, resulting in incomplete sewage treatment and posing a potential pollution risk to the marine environment;

[0006] 3. The domestic sewage storage tank and the grey water collection tank lack effective cleaning devices. After long-term operation, dirt will accumulate on the inner wall surface of the tank, which not only affects the system operation efficiency, but also may generate odors and breed pathogens, increasing the maintenance difficulty and potential safety hazards.

[0007] Therefore, there is an urgent need to design a ship domestic sewage treatment system with optimized structure and perfect functions to solve the above technical problems. Summary of the Invention

[0008] The purpose of the present invention is to provide a ship domestic sewage treatment system, aiming to solve the problems of low resource utilization rate of the domestic sewage storage tank and the grey water collection tank system, incomplete sewage treatment, and difficult tank cleaning in the prior art.

[0009] To achieve the above object, the present invention provides a ship domestic sewage treatment system, comprising: a domestic sewage treatment device; a domestic sewage storage tank for storing domestic sewage; a greywater collection tank for collecting greywater; a domestic sewage transfer pump; a common shore discharge system, which includes pipelines, valve assemblies and shore connectors connected to the domestic sewage storage tank and the greywater collection tank, for discharging the wastewater in the domestic sewage storage tank or the greywater collection tank to the shore or the sea; a sewage reflux system, which includes pipelines and valve assemblies connected between the domestic sewage storage tank and the domestic sewage treatment device, for transporting the sewage in the domestic sewage storage tank to the domestic sewage treatment device for secondary treatment; and a cleaning device, which is arranged in the domestic sewage storage tank and the greywater collection tank for cleaning the inner wall surface of the tank.

[0010] Preferably, the valve assembly of the common shore discharge system includes: a first valve arranged at the outlet of the domestic sewage storage tank; a second valve arranged at the outlet of the greywater collection tank; a third valve arranged on the pipeline discharging to the sea; and a fourth valve and a shore connector arranged on the pipeline discharging to the shore.

[0011] Preferably, the valve assembly further includes a fifth valve arranged at the port side discharge outlet and a sixth valve arranged at the starboard side discharge outlet for controlling the discharge direction of the sewage.

[0012] Preferably, the sewage reflux system includes: a pipeline connecting the domestic sewage storage tank and the domestic sewage transfer pump; a pipeline connecting the domestic sewage transfer pump and the domestic sewage treatment device; and a valve assembly for controlling the sewage flow direction.

[0013] Preferably, the cleaning device includes: an annular pipeline arranged at the top of the domestic sewage storage tank and the greywater collection tank; a plurality of spray holes inclined outward at 45 degrees are arranged on the annular pipeline, the diameter of the spray holes is 5 mm, and the distance between adjacent spray holes is 450 mm; and a water supply pipeline and a control valve connecting the fresh water source and the annular pipeline.

[0014] Preferably, the ship domestic sewage treatment system further includes a direct discharge system of the domestic sewage treatment device, and the direct discharge system of the domestic sewage treatment device includes: a pipeline connecting the outlet of the domestic sewage treatment device and the outboard discharge outlet; and a valve assembly for controlling the sewage flow direction.

[0015] Preferably, the domestic sewage transfer pump is used for transporting the sewage in the domestic sewage storage tank to the shore, the sea or the domestic sewage treatment device, and for transporting the greywater in the greywater collection tank to the shore or the sea.

[0016] Preferably, the ship domestic sewage treatment system further includes a water supply system for injecting fresh water into the domestic sewage storage tank and the grey water collection tank.

[0017] According to the technical content disclosed in the present invention, the following beneficial effects are achieved:

[0018] The domestic sewage storage tank and the grey water collection tank share a set of shore discharge systems, reducing the number of devices, saving ship space and costs; the sewage in the domestic sewage storage tank can flow back to the domestic sewage treatment device for secondary treatment, improving the sewage treatment effect and better protecting the marine environment; a dedicated cleaning device for the cabin is provided, keeping the system clean, reducing the maintenance difficulty, extending the service life of the device, and at the same time reducing the risk of odor and pathogen breeding.

[0019] Other features and advantages of the present invention will become clear from the following detailed description of the exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings incorporated in the specification and constituting a part of the specification illustrate embodiments of the present invention and, together with the description, are used to explain the principles of the present invention.

[0021] Figure 1 is a schematic structural diagram of a ship domestic sewage treatment system of the present invention;

[0022] Figure 2 is a schematic structural diagram of the cleaning device of the present invention.

[0023] Figure 3 is Figure 2 the sectional view taken along the line A-A in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Now, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0025] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or its use.

[0026] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the specification.

[0027] In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0028] It should be noted that like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

[0029] As Figures 1 to 3 shown, a ship domestic sewage treatment system provided by the present invention includes a domestic sewage treatment device 1, a domestic sewage storage tank 2, a grey water collection tank 3, a domestic sewage transfer pump 4, a common shore discharge system 5, a sewage reflux system, and a cleaning device.

[0030] The domestic sewage treatment device 1 is used to treat the sewage generated in the living area of the ship to meet the discharge standards. This device usually adopts methods such as biological treatment, chemical treatment, or physical treatment, and the specific treatment process can be selected according to the ship type and sewage characteristics.

[0031] The domestic sewage storage tank 2 is used to temporarily store untreated or treated domestic sewage. Especially when the ship is in a prohibited discharge area such as a port, the sewage can be temporarily stored in this tank.

[0032] The grey water collection tank 3 is used to collect grey water generated in areas such as the ship's washroom, kitchen, and laundry room. The pollution degree of this water is relatively light.

[0033] The domestic sewage transfer pump 4 is a key device of the system, which is used to transfer the sewage in the domestic sewage storage tank 2 and the grey water collection tank 3 to the onshore receiving facility, directly discharge it into the sea, or send it back to the domestic sewage treatment device 1 for re - treatment.

[0034] The common shore discharge system 5 is one of the core innovations of the present invention. It realizes the sharing of a set of discharge systems for the domestic sewage storage tank 2 and the grey water collection tank 3, including connecting pipelines and a series of control valves.

[0035] Specifically, the common shore discharge system 5 includes:

[0036] A first valve (labeled RD08 in the figure) provided at the outlet of the domestic sewage storage tank 2;

[0037] A second valve (labeled RD10 in the figure) provided at the outlet of the grey water collection tank 3;

[0038] A third valve (labeled RD12 in the figure) provided on the pipeline discharging to the sea;

[0039] A fourth valve (labeled RD13 in the figure) and a shore connection (labeled RD37, RD38 in the figure) provided on the pipeline discharging to the shore;

[0040] A fifth valve (labeled RD15 in the figure) provided at the port side discharge outlet and a sixth valve (labeled RD16 in the figure) provided at the starboard side discharge outlet.

[0041] The sewage reflux system is another innovative point of the present invention. It enables the sewage in the domestic sewage storage tank 2 to reflux to the domestic sewage treatment device 1 for secondary treatment, improving the sewage treatment effect. The system includes pipelines connecting the domestic sewage storage tank 2 and the domestic sewage transfer pump 4, pipelines connecting the domestic sewage transfer pump 4 and the domestic sewage treatment device 1, and corresponding control valves.

[0042] As Figure 2 shown, the cleaning device is arranged on the tops of the domestic sewage storage tank 2 and the grey water collection tank 3 for periodically cleaning the inner wall surface of the tank. The cleaning device includes an annular pipeline 6, a plurality of spray holes 7, and a water supply pipeline and control valves (not shown in the figure) connecting the fresh water source and the annular pipeline 6. The annular pipeline 6 surrounds the periphery of the tank top in a circle. The spray holes 7 are inclined at an angle of 45 degrees towards the tank wall, with a diameter of 5 mm and a spacing of 450 mm between adjacent holes. Through these spray holes 7, the cleaning water added with a cleaning agent can be evenly sprayed onto the tank wall, effectively removing the attachments.

[0043] In addition, the present invention also includes a direct discharge system for the domestic sewage treatment device, including pipelines connecting the outlet of the domestic sewage treatment device 1 and the outboard discharge outlet and control valves (labeled as RD21, RD07, RD12, etc. in the figure), for directly discharging the treated and up-to-standard sewage into the sea.

[0044] The present invention also includes a water supply system (not fully shown in the figure) for injecting fresh water into the domestic sewage storage tank 2 and the grey water collection tank 3, so as to dilute before discharging the sewage or provide cleaning water during the cleaning operation.

[0045] The working process of the present invention is as follows:

[0046] Example 1: Shore discharge operation of the grey water collection tank

[0047] Step S1: Close the port side discharge outlet valve RD15, the shore connection RD37, the outboard discharge valve RD12, and the black water valve RD08;

[0048] Step S2: Open the starboard side discharge outlet valve RD16, the shore connection RD38, the shore discharge valve RD13, and the grey water valve RD10;

[0049] Step S3: Inject an appropriate amount of fresh water into the grey water collection tank 3;

[0050] Step S4: Start the domestic sewage transfer pump 4 to discharge the sewage in the grey water collection tank 3 to the shore receiving facility.

[0051] Example 2: Shore discharge operation of the domestic sewage storage tank

[0052] Step S1: Close the starboard discharge valve RD15, the shore connection RD37, the overboard discharge valve RD12, and the grey water valve RD10;

[0053] Step S2: Open the port discharge valve RD16, the shore connection RD38, the shore discharge valve RD13, and the black water valve RD08;

[0054] Step S3: Inject an appropriate amount of fresh water into the domestic sewage storage tank 2;

[0055] Step S4: Start the domestic sewage transfer pump 4 to discharge the sewage in the domestic sewage storage tank 2 to the onshore receiving facility.

[0056] Example 3: Operation of recycling the sewage in the domestic sewage storage tank

[0057] Step S1: Close the grey water collection tank valve parts RD10, the overboard discharge valve RD12, and the shore discharge valve RD13;

[0058] Step S2: Open the domestic sewage storage tank valve parts RD08;

[0059] Step S3: Start the domestic sewage transfer pump 4 to transfer the sewage in the domestic sewage storage tank 2 to the domestic sewage treatment device 1 for re - treatment.

[0060] Example 4: Operation of directly discharging the treated sewage from the domestic sewage treatment device into the sea

[0061] Step S1: Open the valve parts RD21, RD07, and RD12;

[0062] Step S2: Close the valve part RD13;

[0063] Step S3: Through the discharge pump equipped in the domestic sewage treatment device 1, directly discharge the qualified treated sewage into the sea.

[0064] Example 5: Operation of cleaning the cabin

[0065] Step S1: Ensure that the sewage in the cabin has been emptied;

[0066] Step S2: Add an appropriate amount of cleaning agent to the fresh water source;

[0067] Step S3: Open the control valve of the cleaning device to make the cleaning water evenly spray onto the cabin wall through the spray holes 7 on the annular pipeline 6;

[0068] Step S4: After cleaning for a certain period of time, close the control valve of the cleaning device;

[0069] Step S5: Drain the cleaning wastewater in the cabin according to the steps of Example 1 or Example 2.

[0070] In summary, through the innovative design of sharing the shore connection system, sewage reflux system and cleaning device, the present invention realizes equipment integration, reduces the space occupied by the ship; improves the sewage treatment effect and better protects the environment; simplifies the operation and maintenance process and reduces the operation cost; meets the latest requirements of the International Maritime Organization (IMO) for ship sewage treatment, and has significant economic and environmental benefits.

[0071] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A ship domestic sewage treatment system, characterized in that: include: Domestic sewage treatment plants; Domestic sewage storage tank, used to store domestic sewage; A grey water collection chamber for collecting grey water; Domestic sewage pump; A common shore discharge system, the common shore discharge system comprising pipelines, valve assemblies and shore connectors connected to the domestic sewage storage tank and the gray water collection tank, for discharging wastewater in the domestic sewage storage tank or the gray water collection tank to the shore or the sea; A sewage return system, the sewage return system comprising a pipeline and a valve assembly connected between the domestic sewage storage tank and the domestic sewage treatment device, for conveying the sewage in the domestic sewage storage tank to the domestic sewage treatment device for secondary treatment; as well as A cleaning device is arranged in the domestic sewage storage compartment and the gray water collection compartment, and is used for cleaning the inner wall surface of the compartment.

2. The ship sewage treatment system according to claim 1, characterized in that: The valve assembly of the common shore discharge system includes: A first valve disposed at the outlet of the domestic sewage storage tank; A second valve disposed at the outlet of the grey water collection chamber; A third valve installed on the pipeline discharging to the sea; and The fourth valve and the shore connector are arranged on the pipeline discharging to the shore.

3. The ship sewage treatment system according to claim 2, characterized in that: The valve assembly further comprises a fifth valve arranged at the port side discharge port and a sixth valve arranged at the starboard side discharge port, which are used to control the direction of sewage discharge.

4. The ship sewage treatment system according to claim 1, characterized in that: The sewage return system comprises: A pipeline connecting the domestic sewage storage tank and the domestic sewage delivery pump; a pipeline connecting the domestic sewage delivery pump and the domestic sewage treatment device; and A valve assembly that controls the flow direction of sewage.

5. The ship sewage treatment system according to claim 1, characterized in that: The cleaning device comprises: An annular pipeline disposed on the top of the domestic sewage storage tank and the gray water collection tank; The annular pipeline is provided with a plurality of water spray holes inclined outward at 45 degrees, the diameter of the water spray holes is 5 mm, and the spacing between adjacent water spray holes is 450 mm; and A water supply pipeline and a control valve are connected between a fresh water source and the annular pipeline.

6. The ship sewage treatment system according to claim 1, characterized in that: It also includes a direct discharge system for a domestic sewage treatment device, the direct discharge system for a domestic sewage treatment device including: a pipeline connecting the outlet of the domestic sewage treatment device and the overboard discharge outlet; and A valve assembly that controls the flow direction of sewage.

7. The ship sewage treatment system according to claim 1, characterized in that: The domestic sewage delivery pump is used to deliver the sewage in the domestic sewage storage tank to the shore, the sea or the domestic sewage treatment device, and to deliver the gray water in the gray water collection tank to the shore or the sea.

8. The ship sewage treatment system according to claim 1, characterized in that: Also included is a water supply system for injecting fresh water into the domestic sewage storage tank and the gray water collection tank.

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