A marine sewage mixing treatment device and sewage treatment system

Abstract

This application relates to a marine sewage mixing and treatment device and system, mainly used for treating domestic sewage from ships. It includes: an air flotation separator with an opening at its bottom; a reaction tank and a clear water tank located at the bottom of the air flotation separator; a scum storage tank located at the top of the air flotation separator, with its top connected to the air flotation separator; a scum discharge hole at the bottom of the scum storage tank and a ventilation opening at its top; a connecting pipe, one end of which extends into the reaction tank, and the other end located within the air flotation separator, the reaction tank being connected to the clear water tank; and a drain outlet at the bottom of the clear water tank for discharging clear water. This application overcomes the problem of traditional air flotation devices being unusable under rough water conditions through structural and process design, and significantly reduces equipment size and processing time compared to conventional marine sewage treatment devices.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and in particular to a marine wastewater mixing treatment device and wastewater treatment system. Background Technology

[0002] Currently, the mainstream marine wastewater treatment system employs biological methods, which remove organic pollutants from wastewater through the metabolism of microorganisms. MBR (Membrane Bioreactor) is primarily used on ships, while MBBR (Moving Bed Bioreactor) is sometimes used on large passenger ships such as cruise ships due to the larger volume of domestic wastewater requiring treatment. Wastewater treatment systems using biological methods have drawbacks such as large equipment size, long reaction times, and unstable treatment effects.

[0003] Some manufacturers, both domestically and internationally, have begun to experiment with air flotation to treat domestic sewage generated by ships. Air flotation refers to the process of using highly dispersed microbubbles as carriers to adhere to pollutants in wastewater, making their buoyancy greater than their weight and the resistance to buoyancy, thereby causing the pollutants to float to the water surface and form foam. The foam is then scraped off from the water surface by a sludge scraper, achieving solid-liquid or liquid-liquid separation. Air flotation is a physical method for treating domestic sewage.

[0004] The specific process of air flotation is as follows: Microbubbles (below 80 μm, but not too small to prevent collapse) are generated in water using a bubble generation system (such as pressurized dissolved air, rotating ceramic membranes, etc.). These bubbles combine with suspended particles in the wastewater (such as colloids, algae, oil droplets, and some organic matter) through physical adhesion and charge neutralization, forming an air-float body with a density less than water. Under buoyancy, the air-float body quickly rises to the surface, forming a scum layer that is removed. The lower layer of clear water is then treated to meet discharge standards or reused. However, some problems still exist:

[0005] 1. The slag scraper equipment used in conventional air flotation processes fails under ship rolling conditions;

[0006] 2. As a purely physical method, air flotation is not very effective at removing dissolved organic matter. Some manufacturers use activated carbon adsorption bed technology, which is too expensive and extremely difficult to replace, and requires the addition of ultraviolet disinfection devices, etc.

[0007] 3. The common use of cylindrical water tanks limits the diameter of the equipment to the size of the transport vehicle, which in turn limits the hydraulic residence time and makes it impossible to guarantee the treatment effect; Summary of the Invention

[0008] In view of the shortcomings of the prior art, this application provides a marine sewage mixing and treatment device and sewage treatment system to solve the above-mentioned technical problems existing in the prior art.

[0009] To achieve the above objectives, this application provides the following technical solution.

[0010] An air flotation separator is provided, with an opening at the bottom of the air flotation separator. A reaction cabinet and a clear water cabinet are provided at the bottom of the air flotation separator, and a scum storage cabinet is provided at the top of the air flotation separator. The top of the scum storage cabinet is connected to the air flotation separator.

[0011] The scum storage tank is provided with a scum discharge hole at the bottom and a ventilation opening at the top;

[0012] A connecting pipe, one end of which extends into the reaction cabinet and the other end of which is located in the air flotation separation area inside the air flotation separation cabinet, the reaction cabinet being connected to the clear water tank;

[0013] The lower end of the water tank is equipped with a drain outlet for discharging clean water.

[0014] In some embodiments, an ozone generator is connected to the bottom of the reaction cabinet, and the ozone generator delivers the generated ozone into the reaction cabinet.

[0015] In some embodiments, a through hole is provided between the reaction cabinet and the clear water tank, and a float valve is provided at the through hole. The float valve is located inside the clear water tank and is used to control the water level inside the clear water tank.

[0016] In some embodiments, the connecting pipe has an inverted U-shaped structure, which includes a first vertical pipe extending through into the reaction cabinet, a second vertical pipe located above the water tank, and a horizontal pipe connecting the first vertical pipe and the second vertical pipe.

[0017] In some embodiments, preferably, a filter screen is provided at the opening of the second vertical pipe.

[0018] In some embodiments, the scum storage tank is formed by a base plate and the cabinet wall of the air flotation separator. The base plate includes a first base plate parallel to the top surface of the air flotation separator and a second base plate extending obliquely toward the top surface of the air flotation separator, such that the second base plate and the first base plate form an obtuse angle, and a flow opening is left between the top of the second base plate and the top surface of the air flotation separator.

[0019] In some embodiments, the scum storage tank is further provided with a liquid level switch, wherein the liquid level switches are arranged sequentially from top to bottom as a first liquid level switch and a second liquid level switch.

[0020] In some embodiments, a rotating ceramic membrane device is provided at the orifice, and the rotating ceramic membrane device is located inside the air flotation separator.

[0021] It also includes an air compression device located outside the air flotation separator, which sends the generated compressed air into the rotating ceramic membrane device.

[0022] In some embodiments, a gas-liquid mixing pump is also included, which introduces a highly dissolved solution of water and air mixed in the air flotation separator into the air flotation separator through the orifice.

[0023] This application also provides a wastewater treatment system, including:

[0024] A sewage buffer tank, a sewage pulverizing pump, and a marine sewage mixing and treatment device, wherein the marine sewage mixing and treatment device is any one of the marine sewage mixing and treatment devices in the above embodiments.

[0025] Wastewater passes sequentially through the wastewater buffer tank, the wastewater pulverizing pump, and the marine wastewater mixing and treatment device. A dosing pump is also installed between the wastewater pulverizing pump and the marine wastewater mixing and treatment device.

[0026] This application addresses the issue of combining air flotation technology with advanced oxidation technology in marine wastewater treatment. Through structural and process design, it overcomes the problem of traditional air flotation devices being unusable under rough water conditions, and significantly reduces equipment size and processing time compared to conventional marine wastewater treatment devices. The technical solution and embodiments of this application each have at least one of the following beneficial effects:

[0027] 1. Air bubbles are introduced into the air flotation separator through the vent at the bottom of the air flotation separator, causing an air flotation reaction in the wastewater inside the separator. At the same time, the wastewater that has undergone the air flotation reaction is introduced into the reaction tank for further treatment through the connecting pipe, and then enters the clear water tank before flowing out. This process achieves wastewater treatment with good treatment effect and high treatment efficiency.

[0028] 2. The aeration discs installed inside the reaction tank further treat the water in the flotation separator, which not only achieves the treatment effect required by the discharge regulations, but also maintains a small overall size.

[0029] 3. By using float valves in the through-holes between the reaction tank and the clear water tank, and by controlling the start and stop of each pump with level switches, the water level in each tank can be controlled. This transforms the continuous water inflow into a sequential batch discharge of sludge and water, solving the sludge discharge problem in the air flotation treatment unit under shaking conditions.

[0030] 4. The pre-treated wastewater in the flotation separator flows into the reaction tank through the connecting pipe. At the same time, the inverted U-shaped connecting pipe ensures the clarity of the incoming water and places the water inlet at the bottom of the reaction tank to increase the reaction time of the water to be treated in the reaction tank.

[0031] 6. Through the unique design of the storage tank shape, pollutants floating in the air flotation separator can be effectively and quickly entered into the storage tank and finally discharged in a timely manner through the slag discharge hole;

[0032] 7. Through the rotating ceramic membrane device installed at the vent, and the air compression device, compressed air is sent into the rotating ceramic membrane device. The compressed air passes through the membrane pores of the ceramic membrane and is subjected to the shear force of rotation, which will generate bubbles with a diameter of 40-60μm in the water. An air flotation reaction will occur in the sewage, and impurities in the sewage will float to the surface under the action of the bubbles, forming a scum layer, thus achieving preliminary sewage treatment.

[0033] 8. The wastewater treatment system is designed to be highly effective, compact, and quick to operate, making it suitable for marine environments. Attached Figure Description

[0034] The preferred embodiments will now be described in a clear and easy-to-understand manner, with reference to the accompanying drawings, to further illustrate the above-mentioned characteristics, technical features, advantages, and implementation methods of this application. The preferred embodiments are given only as examples, and this application is not limited thereto.

[0035] Figure 1 Here is a schematic diagram of a marine sewage mixing and treatment device provided in this application;

[0036] Figure 2 Here is a schematic diagram of the structure of a wastewater treatment system provided in this application;

[0037] Figure 3 Here is a schematic diagram of the structure of the second type of wastewater treatment system provided in this application;

[0038] Figure 4 Here is a schematic diagram of the third type of wastewater treatment system provided in this application;

[0039] Explanation of the reference numerals in the attached figures.

[0040] 100: Marine wastewater mixing and treatment unit; 101: Air flotation separator; 102: Hole;

[0041] 200: Reactor cabinet; 201: Aeration disc; 202: Ozone generator; 203: Connecting pipe; 2031: First vertical pipe; 2032: Second vertical pipe; 2033: Horizontal pipe;

[0042] 300: Clean water tank; 301: Drain outlet; 302: Ball valve; 303: Low level switch; 304: High level switch;

[0043] 400: Scum storage tank; 401: First liquid level switch; 402: Second liquid level switch; 403: Scum discharge hole; 404: Bottom plate; 4041: First bottom plate; 4042: Second bottom plate; 405: Flow outlet; 406: Ventilation outlet;

[0044] 500: Rotating ceramic membrane device;

[0045] 600: Air compression device;

[0046] 700: Gas-liquid mixing pump;

[0047] 800: Pressure tank;

[0048] 900: Sewage buffer tank;

[0049] 110: Sewage pulverizer pump;

[0050] 120: Dosing pump. Detailed Implementation

[0051] To more clearly illustrate the embodiments of this application or the technical solutions in the prior art, the specific implementation methods of this application will be described below with reference to the accompanying drawings. The accompanying drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without creative effort.

[0052] To keep the drawings concise, each drawing only schematically shows the parts relevant to this application and does not represent their actual structure as a product. In some drawings, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "a" means not only "only one" but also "more than one." The term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. The terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0053] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0054] Additionally, in the accompanying drawings, underlined reference numerals indicate illustrated assemblies. Reference numerals with short, arrowless curves are used to indicate solid parts or structures; reference numerals with arrowed curves indicate non-solid structures or geometric features of solid structures, such as recesses, through holes, grooves, and surfaces. Parentheses indicate the extent of a local structure. Double-dotted lines indicate the structural boundaries of a local structure, the outline of a virtual component, or indicate direction. Leader lines with arrows are used to indicate the flow direction of gases or liquids.

[0055] Wastewater treatment equipment is an industrial device that can effectively treat urban domestic sewage and industrial wastewater. Its main purpose is to treat domestic sewage and similar industrial organic wastewater to meet reuse water quality requirements, enabling the resource utilization of treated wastewater. The wastewater treatment system described in this application is mainly used for marine wastewater treatment. Marine wastewater has the following characteristics: 1. Due to space constraints on ships, water-saving sanitary fixtures are typically used, resulting in a much smaller flushing water volume than in urban areas, while the concentration of pollutants in marine domestic sewage is higher than in urban domestic sewage; 2. The type of ship, the sanitary fixtures used, and the living habits of crew and passengers can all affect the quality and quantity of marine domestic sewage; 3. Marine domestic sewage contains high concentrations of organic matter, minerals, and pathogenic microorganisms (such as E. coli); 4. The biochemical oxygen demand (BOD5) is typically between 500 and 1200 mg / L, and the suspended solids (SS) content is high; 5. Direct discharge without treatment may lead to various water pollution incidents, including eutrophication, disruption of the aquatic ecosystem, damage to the habitat of aquatic organisms, and impacts on human health. Therefore, this application specifically proposes a marine wastewater mixing and treatment device 100 and a wastewater treatment system. By cleverly combining air flotation technology with advanced oxidation technology, it not only improves the treatment effect and shortens the treatment time, but also effectively reduces the overall system volume while ensuring ease of use. Furthermore, through structural and process design, it solves the problem of sludge discharge from the air flotation treatment device in the turbulent environment of a ship.

[0056] like Figure 1As shown, this application provides a marine sewage mixing and treatment device 100, which is mainly used to treat marine sewage. Specifically, it includes an air flotation separator 101. An opening 102 is provided at the bottom of the air flotation separator 101 for installing a rotating ceramic membrane device. The air bubbles generated by the rotating ceramic membrane undergo an air flotation reaction in the sewage in the air flotation separator 101, which floats the solid and colloidal impurities in the water to the liquid surface and forms scum. Meanwhile, a reaction tank 200 and a clear water tank 300 are installed at the bottom of the air flotation separator 101, and a scum storage tank 400 is installed at the top of the air flotation separator 101. The top of the scum storage tank 400 is connected to the air flotation separator 101. The bottom of the scum storage tank 400 is provided with a scum discharge hole 403 for discharging scum, and the top is provided with a vent 406. In this way, the scum formed in the air flotation separator 101 enters the storage tank 400 through the connection, and finally the scum is discharged from the scum discharge hole 403 for collection and treatment. The vent 406 at the top can effectively prevent the generation of odor in the scum storage tank 400. This application also includes a connecting pipe 203, with one end extending through to a lower part of the reaction tank 200, and the other end located in the air flotation separation area of ​​the air flotation separator 101. A drain outlet 301 is provided at the lower end of the clear water tank 300. Thus, wastewater that has undergone the air flotation reaction in the air flotation separator 101 flows into the reaction tank 200 through the connecting pipe 203, undergoes a second reaction in the reaction tank 200, and finally flows into the clear water tank 300, from where it is discharged through the drain outlet 301. This design is not only simple in structure but also provides excellent treatment results.

[0057] like Figure 2 As shown, in the marine wastewater mixing and treatment device 100 provided in this application, the purpose of setting up the reaction tank 200 is to further react the wastewater that has undergone air flotation reaction. Therefore, in this application, it is preferable to connect an ozone generator 202 to the bottom of the reaction tank 200, so that the ozone generated by the ozone generator 202 can be transported into the reaction tank 200 to further treat the pre-treated wastewater. Furthermore, an aeration plate 201 is further installed inside the reaction tank 200.

[0058] Of course, in one embodiment, the reaction cabinet 200 can not only use the ozone technology mentioned above, but also, for ships that use seawater as rinsing water, an electrolysis method can be used: electrolysis of seawater uses electrolysis technology to convert chloride ions (Cl-) and other dissolved substances in seawater into strong oxidants (such as hypochlorite ions, hydroxyl radicals, etc.), thereby achieving the purpose of sterilization and reducing BOD.

[0059] like Figure 1 , 2As shown, in the marine sewage mixing and treatment device 100 provided in this application, the reaction tank 200 and the clear water tank 300 are connected. The purpose is to allow the sewage treated in the reaction tank 200 to flow into the clear water tank 300, and then discharge the treated clear water from the clear water tank 300. Therefore, in this application, it is preferable to directly open a through hole on the tank wall between the reaction tank 200 and the clear water tank 300, and the through hole is located at the upper end of the two tanks. In this way, when the water treated in the reaction tank 200 reaches a certain amount, the clean water in the upper part flows into the clear water tank 300 through the through hole. At the same time, in order to control the water volume in the clear water tank 300, a float valve 302 is installed at the through hole, and the float valve 302 is located inside the clear water tank 300. In this way, when the water level in the clear water tank 300 reaches a preset value, the float valve 302 lifts up to block the through hole and prevent the water in the reaction tank 200 from continuing to enter the clear water tank 300.

[0060] Again Figure 1 , 2 As shown in the above embodiment of the marine sewage mixing treatment device 100 provided in this application, the main purpose of the connecting pipe 203 is to flow the water in the air flotation separator 101 after the air flotation reaction into the reaction tank 200. Therefore, there are many ways to set the connecting pipe 203 as long as this function is achieved. However, in this application, the connecting pipe 203 is preferably set in an inverted U-shaped structure. The inverted U-shaped structure includes a first vertical pipe 2031 extending through into the reaction tank 200, a second vertical pipe 2032 located above the clear water tank 300, and a horizontal pipe 2033 connecting the first vertical pipe 2031 and the second vertical pipe 2032. The first vertical pipe 2031 extends to the bottom of the reaction cabinet 200, while the second vertical pipe 2032 is shorter and only needs to be a certain distance from the horizontal pipe 2033. This is to ensure that the water inlet of the connecting pipe 203 faces downward. At the same time, a filter screen is installed at the pipe opening (i.e., the water inlet) of the second vertical pipe 2032 to prevent scum in the water from entering the reaction cabinet 200.

[0061] Again Figure 1 , 2As shown, in the marine sewage mixing treatment device 100 provided in this application, the storage tank 400 can be arranged in various ways. In this application, the storage tank 400 is formed by a base plate 404 and the cabinet wall of the air flotation separator 101. The base plate 404 includes a first base plate 4041 parallel to the top surface of the air flotation separator 101, and a second base plate 4042 extending obliquely toward the top surface of the air flotation separator 101, such that the second base plate 4042 and the first base plate 4041 form an obtuse angle. The purpose is to make the second base plate 4042... The space between the air flotation separator 101 and the cabinet wall forms an inverted funnel shape (i.e., the upper diameter is larger than the lower diameter). At the same time, a flow port 405 is left between the top of the second bottom plate 4042 and the top surface of the air flotation separator 101. This setting can collect the scum that floats on the top layer after the air flotation reaction in the air flotation separator 101 to this inverted funnel shape, and finally flow into the storage tank 400 from the flow port 405 for centralized treatment. This not only reduces the volume of the storage tank 400, but also effectively and quickly treats the scum, improving the treatment efficiency.

[0062] In the above embodiment, a level switch is also provided on the scum storage tank 400. The level switches are arranged sequentially from top to bottom: a first level switch 401, a second level switch 402, and a scum discharge pump is installed at the scum discharge hole 403. A switch 303 is installed on the bottom wall of the clear water tank 300, and a drain pump is installed at the drain outlet 301. The switch 303 is mainly used to control the water level in the clear water tank 300. The entire operation of the device is controlled by the three level switches (first level switch 401, second level switch 402, and switch 303) and the float valve 302. Wastewater continuously enters the air flotation separator 101. When the water, after undergoing flotation and deep treatment, enters the clear water tank 300 and reaches the preset level, the float valve 302 closes. At this point, no more clear water enters the clear water tank 300, causing the overall liquid level in the flotation separator 101 to rise. Scum overflows from the funnel-shaped flow port 405 into the scum storage tank 400. When the first level switch 401 in the scum storage tank 400 is triggered, the scum discharge pump and the drainage pump start simultaneously. When the second level switch 402 in the scum storage tank 400 and the switch 303 in the clear water tank 300 are triggered, the scum discharge pump and the drainage pump stop respectively. Alternatively, a high-level switch 304 can be installed at the top of the clear water tank 300. This level should be consistent with the preset level of the float valve 302. In this design, the first level switch 401 in the scum storage tank 400 can be omitted, and a delay can be set to control the start of the scum discharge pump. The volume and liquid level of each tank should be determined through testing of different models of equipment. This process control transforms continuous water intake into sequential batch slag and water discharge, solving the slag discharge problem of the air flotation treatment unit under shaking conditions.

[0063] like Figure 2As shown, in the marine sewage mixing treatment device 100 provided in this application, the hole 102 at the bottom of the air flotation separator 101 is mainly used to introduce air bubbles into the air flotation separator 101 to cause an air flotation reaction in the sewage. There are various ways to generate air bubbles. In this application, a rotating ceramic membrane device 500 is preferably provided at the hole 102 and the rotating ceramic membrane device 500 is located inside the air flotation separator 101. At the same time, an air compression device 600 is also provided. The compressed air with a pressure of 2 bar generated by the air compression device 600 is sent into the rotating ceramic membrane device 500. When the compressed air passes through the membrane pores of the ceramic membrane and is subjected to the shearing force of rotation, air bubbles with a diameter of 40-60 μm will be generated in the water, and an air flotation reaction will occur in the sewage. Impurities in the sewage will float to the surface under the action of air bubbles and form a scum layer. Because the sewage flow enters the water tank stably, a stable clear water area will be formed at the lower rear end of the water flow. The purified water after flotation treatment will flow through the connecting pipe 203 into the reaction tank 200 for further reaction, and finally flow into the purified water tank 300. The rotating ceramic membrane device 500 not only improves the treatment efficiency, but also effectively reduces the size of the entire equipment.

[0064] In another embodiment, such as Figure 3 As shown, in a marine sewage mixing treatment device 100, the hole 102 at the bottom of the air flotation separator 101 is mainly used to introduce air bubbles into the air flotation separator 101 to cause an air flotation reaction in the sewage. There are various ways to generate air bubbles. In this embodiment, a gas-liquid mixing pump 700 is provided. The gas-liquid mixing pump 700 is connected to the water in the air flotation separator 101 through a pipe. This allows the water in the air flotation separator 101 to mix with the air to form a highly dissolved liquid, which is then introduced into the air flotation separator 101 through the hole 102 to carry out the air flotation reaction.

[0065] Of course, in other embodiments, such as Figure 4 As shown, wastewater can also be mixed with air in the air flotation separator 101 through a separate pressurization tank 800, and then fed into the air flotation separator 101 for treatment.

[0066] This application also provides a wastewater treatment system, such as Figure 2-4As shown, the system mainly includes a sewage buffer tank 900, a sewage pulverizing pump 110, and a marine sewage mixing and treatment device 100. The sewage pulverizing pump 110 is a pulverizing pump with a cutter head, consisting of a sewage transfer pump and a pulverizing device. The marine sewage mixing and treatment device 100 is the same as described in the above embodiment. In this way, the ship's domestic wastewater enters the sewage buffer tank 900 through vacuum collection or gravity collection. The function of the sewage buffer tank 900 is to maintain a stable sewage flow rate into the sewage treatment device. Sewage is transported from the sewage buffer tank 900 to the marine sewage mixing and treatment device 100 by the pulverizing pump 110 with the cutter head. Of course, in some situations, there are special requirements for the conveying flow rate and head, which the sewage pulverizing pump 110 cannot meet; or if a sewage transfer pumping station is already planned on board, a pulverizing device can be arranged after a conventional sewage transfer pump.

[0067] In the above configuration, a dosing pump 120 is further installed between the sewage pulverizing pump 110 and the marine sewage mixing and treatment device 100. The dosing pump 120 can add coagulants and flocculants, which enhance the flotation effect. The coagulant generates positively charged colloids or ions through ionization and hydrolysis, neutralizing the negative charge on the surface of pollutants (such as colloids and suspended solids), eliminating electrostatic repulsion and causing them to destabilize and aggregate. The flocculant (high molecular weight polymer) uses the adsorption and bridging effect of long-chain molecules to aggregate destabilized microparticles into larger flocs, increasing the contact area with air bubbles, enhancing bubble adhesion efficiency, making it easier for pollutants to float and be removed with the air bubbles, and improving the flotation separation effect.

[0068] The entire system's operation is controlled by three level switches: a first level switch 401, a second level switch 402, and a switch 303, as well as a float valve 302. Water from the wastewater buffer tank 900 continuously enters the flotation separator 101 of the marine wastewater mixing treatment device 100 via the wastewater pulverizing pump 110. When the water, after flotation and deep treatment, enters the clear water tank 300 and reaches the preset level, the float valve 302 closes. At this point, clear water no longer enters the clear water tank 300, causing the overall level in the flotation separator 101 to rise. Scum overflows from the funnel-shaped flow port 405 into the scum storage tank 400. When the first level switch 401 in the scum storage tank 400 is triggered, the scum discharge pump and the drainage pump start simultaneously. When the second level switch 402 in the scum storage tank 400 and the switch 303 in the clear water tank 300 are triggered, the scum discharge pump and the drainage pump stop respectively. Alternatively, a high-level switch 304 can be installed at the top of the clear water tank 300. This level should be consistent with the preset level of the float valve 302. With this design, the first level switch 401 in the scum storage tank 400 can be omitted, and a delay can be set to control the start-up of the scum discharge pump. The volume and level of each tank should be determined through testing of different models of the device. This process control transforms continuous water intake into batch scum and water discharge, solving the scum discharge problem of the air flotation treatment device under shaking conditions.

[0069] The above description is merely a preferred embodiment and the technical principles employed in this application. Various obvious changes, readjustments, and substitutions can be made without departing from the concept of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. Where there is no conflict, the above embodiments and features in the embodiments can be combined with each other.

Claims

1. A marine sewage mixing and treatment device for sewage treatment, characterized in that, include: An air flotation separator is provided, with an opening at the bottom of the air flotation separator. A reaction cabinet and a clear water cabinet are provided at the bottom of the air flotation separator, and a scum storage cabinet is provided at the top of the air flotation separator. The top of the scum storage cabinet is connected to the air flotation separator. The scum storage tank is provided with a scum discharge hole at the bottom and a ventilation opening at the top; A connecting pipe, one end of which extends into the reaction cabinet and the other end of which is located in the air flotation separation area inside the air flotation separation cabinet, the reaction cabinet being connected to the clear water tank; The lower end of the water tank is equipped with a drain outlet for discharging clean water.

2. The marine sewage mixing and treatment device according to claim 1, characterized in that: An ozone generator is connected to the bottom of the reaction cabinet, and the ozone generator delivers the generated ozone into the reaction cabinet.

3. The marine sewage mixing and treatment device according to claim 1, characterized in that: A through hole is provided between the reaction cabinet and the clear water tank, and a float valve is provided at the through hole. The float valve is located inside the clear water tank and is used to control the overall water level.

4. The marine sewage mixing and treatment device according to claim 1, characterized in that: The connecting pipe has an inverted U-shaped structure, which includes a first vertical pipe extending through the reaction cabinet, a second vertical pipe located above the water tank, and a horizontal pipe connecting the first vertical pipe and the second vertical pipe.

5. The marine sewage mixing and treatment device according to claim 4, characterized in that: A filter screen is installed at the opening of the connecting pipe.

6. The marine sewage mixing and treatment device according to claim 1, characterized in that: The scum storage tank is formed by a base plate and the cabinet wall of the air flotation separator. The base plate includes a first base plate parallel to the top surface of the air flotation separator and a second base plate extending obliquely toward the top surface of the air flotation separator, such that the second base plate and the first base plate form an obtuse angle, and a flow opening is left between the top of the second base plate and the top surface of the air flotation separator.

7. The marine sewage mixing and treatment device according to claim 6, characterized in that: The scum storage tank is also equipped with a liquid level switch, and the liquid level switches are arranged from top to bottom as a first liquid level switch and a second liquid level switch.

8. The marine sewage mixing and treatment apparatus according to any one of claims 1-7, characterized in that: A rotating ceramic membrane device is provided at the hole, and the rotating ceramic membrane device is located inside the air flotation separator. It also includes an air compression device located outside the air flotation separator, which sends the generated compressed air into the rotating ceramic membrane device.

9. The marine sewage mixing and treatment apparatus according to any one of claims 1-7, characterized in that: It also includes a gas-liquid mixing pump, which pumps a highly dissolved solution of water and air mixed in the air flotation separator into the air flotation separator through the orifice.

10. A wastewater treatment system, characterized in that, include: A sewage buffer tank, a sewage pulverizing pump, and a marine sewage mixing and treatment device, wherein the marine sewage mixing and treatment device is the marine sewage mixing and treatment device according to any one of claims 1-9. Wastewater passes sequentially through the wastewater buffer tank, the wastewater pulverizing pump, and the marine wastewater mixing and treatment device. A dosing pump is also installed between the wastewater pulverizing pump and the marine wastewater mixing and treatment device.

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