External MBR-MBBR (Moving Bed Reactor-Moving Bed Biofilm Reactor) combined marine domestic sewage treatment device

Abstract

The utility model discloses an external MBR-MBBR combined marine domestic sewage treatment device. The external MBR-MBBR combined marine domestic sewage treatment device is characterized by comprising a sewage inlet, a regulating water tank, a crushing pump, a fluidized anoxic bioreactor, a fluidized aerobic bioreactor, an MBR circulating pump, an ultrafiltration ceramic membrane, a jet aerator, a backwashing tank, a standard water discharge outlet and a chemical washing tank, a rotary garbage separator for automatically compressing and packaging filtered particles is arranged between the sewage inlet and the adjusting water tank; the rotary garbage separator is fixed on the adjusting water tank; an outlet of the ultrafiltration ceramic membrane is respectively connected with the jet aerator and the backwashing tank; the jet aerator is connected with the fluidized aerobic bioreactor; and the backwashing tank is connected with a standard water discharge port. The domestic sewage treatment device for the ship adopts an external MBR-MBBR coupling technology to treat domestic sewage, and is small in equipment size, convenient to repair and maintain, high in automation degree and unattended.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to an external MBR-MBBR combined marine domestic sewage treatment device. Background Art

[0002] my country's large number of ships, their wide range of activities, and their high mobility, while providing convenience, also present a significant source of pollution in the transportation sector. With the rapid increase in the number of ships operating at sea, coastal waters are becoming increasingly polluted, posing a threat to human health. In recent years, with growing awareness of ecological and environmental protection, wastewater discharge from ships has received increased attention and attention. Proper treatment and recycling of ship wastewater is essential for the development of my country's shipping industry and a necessary step towards maintaining ecological security and promoting ecological civilization.

[0003] Among various methods and equipment for treating domestic sewage on ships, biochemical treatment devices are the most commonly used. Current biochemical treatment systems typically utilize a "two-stage aeration + inclined plate sedimentation" or "contact oxidation + hollow fiber MBR (membrane bioreactor)" process flow. For example, a "continuous-flow anoxic / aerobic coupled anaerobic ammonium oxidation sewage treatment device and method," published in Chinese patent literature and with publication number CN111087074A, comprises an inlet unit, which introduces the sewage to be treated; a continuous-flow anoxic / aerobic reactor, comprising an anoxic section and an aerobic section; a secondary sedimentation tank, into which the effluent from the aerobic section flows for sedimentation; an intermediate tank, into which the effluent from the secondary sedimentation tank flows; a UASB (anaerobic ammonium oxidation) reactor, in which the sewage in the intermediate tank undergoes anaerobic ammonium oxidation denitrification; and an outlet unit, into which the qualified sewage discharged from the anaerobic ammonium oxidation reactor enters. This invention couples an anaerobic ammonium oxidation reactor to a traditional anoxic / aerobic reactor, and increases the original process processing capacity and improves the effluent quality through segmented water inlet and reflux. This solution combines an anoxic / aerobic reactor with an anaerobic ammonium oxidation reactor to reduce the nitrogen content in the effluent, and the device can use an anaerobic ammonium oxidation reactor alone to purify water, and can treat different water qualities separately. However, the sewage to be treated in this solution is directly introduced into the anoxic reactor from the water inlet tank. The garbage and solid particles in the sewage can easily clog the pump body and pipelines, causing damage to components; the overall device is not compact enough. For example, the aeration module of the aerobic reactor requires an external air compressor, and the device uses a total of 6 pumps, which are inconvenient to use and maintain.

[0004] Unlike urban sewage, domestic sewage from ships is particularly susceptible to the effects of motion. Existing domestic sewage treatment technologies have two fundamental problems that remain unresolved: first, the traditional biochemical method uses gravity sedimentation, which results in poor solid-liquid separation once the ship is in a swaying or tilting state, affecting the quality of the treated discharge water; second, due to the low concentration of microorganisms, the sewage has poor resistance to the impact of organic and hydraulic loads. These problems have resulted in existing biochemical sewage treatment plants being large in size, prone to sludge bulking and denitrification of precipitated sludge, and complex to operate and manage. Therefore, there is an urgent need for an integrated, intelligent, and efficient ship-based domestic sewage treatment plant to treat domestic sewage generated during ship navigation, thereby reducing sewage pollution to the marine environment.

[0005] It should be noted that the statements herein merely provide background information related to the present application and do not necessarily constitute prior art. Summary of the Invention

[0006] In view of the above problems, the present application proposes an external MBR-MBBR combined marine domestic sewage treatment device that overcomes the above problems or at least partially solves the above problems.

[0007] In summary, in order to overcome the shortcomings of the prior art such as substandard effluent quality, excessively large device size, and difficulty in repair and maintenance, the present invention provides a marine domestic sewage treatment device that can automatically filter and pack large pieces of garbage entering the water. Compared with existing marine devices of the same processing scale, the device has a reduced size and weight, is easy to clean and replace membrane components, has stable effluent quality, a high degree of automation, and can adapt to the use environment during the ship's navigation.

[0008] This application adopts the following technical solutions:

[0009] Disclosed is an external MBR-MBBR combined marine domestic sewage treatment device, comprising a sewage inlet, a regulating water tank, a pulverizing pump, a fluidized anoxic bioreactor, a fluidized aerobic bioreactor, an MBR circulation pump, an ultrafiltration ceramic membrane, a jet aerator, a backwash tank, a qualified water discharge outlet, and a chemical washing tank; a rotating garbage separator capable of automatically compressing, packing, and filtering out particles is provided between the sewage inlet and the regulating water tank; the rotating garbage separator is fixed to the regulating water tank; the regulating water tank, pulverizing pump, fluidized anoxic bioreactor, fluidized aerobic bioreactor, MBR circulation pump, and ultrafiltration ceramic membrane are sequentially connected along the water flow direction; the outlet of the ultrafiltration ceramic membrane is respectively connected to the jet aerator and the backwash tank; the jet aerator is connected to the fluidized aerobic bioreactor; and the backwash tank is connected to the qualified water discharge outlet.

[0010] Preferably, a water tank level gauge is provided in the regulating water tank, and the water tank level gauge is a float type level gauge with adjustable upper and lower limits.

[0011] Preferably, a pulverizing direct discharge port with a three-way valve is provided between the pulverizing pump and the fluidized anoxic bioreactor; the diameter of the direct discharge particles of the pulverizing direct discharge port is less than or equal to 5 mm.

[0012] Preferably, the fluidized anoxic bioreactor comprises an exhaust port and a bacterial agent addition port, an interception net for promoting fluidization is provided at the bottom, and an anoxic circulation pump is provided outside.

[0013] Preferably, the fluidized aerobic bioreactor and the fluidized anoxic bioreactor are fixed integrally, and the fluidized aerobic bioreactor consists of two or more fluidized cycles.

[0014] Preferably, the fluidized aerobic bioreactor comprises a second exhaust port and a second bacterial agent addition port, an interception net for promoting fluidization is provided at the bottom, and an aerobic liquid level meter is provided inside.

[0015] Preferably, the backwash tank is provided with a compressed air interface; the drug washing box is provided with a drug washing waste liquid discharge port, and the drug washing box is connected to the ultrafiltration ceramic membrane.

[0016] Preferably, an ultraviolet sterilization lamp is provided between the backwash tank and the qualified water discharge port.

[0017] Preferably, the regulating water tank, the fluidized anoxic bioreactor, the fluidized aerobic bioreactor, and the drug washing tank are all provided with an emptying pipeline.

[0018] Preferably, the ultrafiltration ceramic membrane uses an external silicon carbide ceramic membrane as a filtration membrane element and is equipped with a dedicated membrane shell.

[0019] Preferably, the rotary garbage separator can filter out impurity particles larger than 5 mm in the ship's domestic sewage and automatically compress and pack them, eliminating the need for manual cleaning of the filter residue.

[0020] Preferably, the backwash tank becomes a closed container after the electric ball valve is closed. After the solenoid valve connected to the compressed air is opened, the pressure of the compressed air presses the water in the tank into the ceramic membrane. After all the water flushing is completed, air is continuously introduced for backwashing.

[0021] As a preferred option, the chemical washing process requires manual switching of the water inlet valve and configuration of chemicals, and the MBR circulation pump is used to provide chemical washing power. The chemical washing agent circulates between the chemical washing tank and the ultrafiltration ceramic membrane, and the waste liquid after cleaning is discharged through the discharge port on the chemical washing tank.

[0022] As a preferred option, after the MBR produced water fills the backwash tank, it flows through the ultraviolet sterilization lamp to further eliminate pathogenic bacteria such as Escherichia coli, and the water discharged from the ultraviolet sterilization lamp can meet the discharge standards.

[0023] The above technical solutions adopted in the embodiments of the present application can achieve the following beneficial effects:

[0024] The use of external MBR can increase the concentration of activated sludge, reduce the volume of the equipment, reduce the fouling of the membrane elements, and greatly improve the maintainability of the equipment.

[0025] The biochemical part adopts MBBR technology to ensure that the effluent water quality meets the requirements of the latest MPEC.227. (64) regulations, while being able to adapt to the adverse and harsh environment of the ship during navigation.

[0026] The cleaning process includes three methods: backwashing, air washing and chemical washing. The ultrafiltration ceramic membrane is maintained by cleaning, which extends the service life of the membrane element.

[0027] The above description of the technical solution of the present application is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0029] Figure 1 This is a structural diagram of a marine domestic sewage treatment device in an embodiment of the present application.

[0030] In the figure: 1-sewage inlet, 2-regulating water tank, 21-water tank level gauge, 3-rotating garbage separator, 4-crushing pump, 41-crushing direct discharge port, 5-fluidized anoxic bioreactor, 51-exhaust port 1, 52-microbial agent addition port 1, 53-anoxic circulation pump, 6-fluidized aerobic bioreactor, 61-exhaust port 2, 62-microbial agent addition port 2, 63-aerobic level gauge, 7-MBR circulation pump, 8-ultrafiltration ceramic membrane, 9-jet aerator, 10-backwash tank, 101-compressed air interface, 11-ultraviolet sterilization lamp, 12-standard water discharge port, 13-drug washing tank, 131-drug washing waste liquid discharge port. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0032] like Figure 1As shown, the present application provides an external MBR-MBBR combined marine domestic sewage treatment device, including a sewage inlet 1, a regulating water tank 2 with an automatic garbage separation function, a rotating garbage separator 3, a pulverizing pump 4, a fluidized anoxic bioreactor 5, a fluidized aerobic bioreactor 6, an MBR circulation pump 7, an ultrafiltration ceramic membrane 8, a jet aerator 9, a backwash tank 10, an ultraviolet sterilization lamp 11, a standard water discharge port 12, a drug washing tank 13, a drug washing waste liquid discharge port 131, a pulverizing direct discharge port 41 and an electrical control system; the sewage inlet is connected to the rotating garbage separator 3; the regulating water tank 2 is connected to the fluidized anoxic bioreactor 5 and the fluidized aerobic bioreactor 6, and as a whole serves as part of the main treatment device; the fluidized aerobic bioreactor 6 is connected to the fluidized anoxic bioreactor 5 and the fluidized aerobic bioreactor 6 through the jet The aerator 9 obtains the oxygen required for the growth and reproduction of microorganisms; the fillers of the fluidized anoxic bioreactor 5 and the fluidized aerobic bioreactor 6 are always in a fluidized state during operation and can be turned over freely; the ultrafiltration ceramic membrane 8 is connected to the MBR circulation pump 7 and the backwash tank 10 respectively; the chemical washing water tank 13 is connected to the ultrafiltration ceramic membrane 8 and the MBR circulation pump 7, and can be switched between the sewage filtration and cleaning circuits through a three-way valve; the ultraviolet sterilization lamp 11 is connected to the backwash tank 10; the treated water standard discharge port 12 is connected to the ultraviolet sterilization lamp 11; the pulverization direct discharge port 41 is connected to the pulverization pump 4; the electrical control system coordinates the operation of the equipment of the entire device; the regulating water tank 2, the fluidized anoxic bioreactor 5, the fluidized aerobic bioreactor 6, and the chemical washing tank 13 are all provided with emptying pipes.

[0033] like Figure 1 As shown, the regulating water tank 2 also includes a rotating garbage separator 3 and a water tank liquid level gauge 21. The pulverizing pump 4 switches the pulverizing and discharge to the outside or transports the treated sewage to the fluidized anoxic bioreactor 5 through a three-way valve, and the flow rate can be further controlled by a manual ball valve; the fluidized anoxic bioreactor 5 also includes a fluidized anoxic bioreactor circulation pump 53, and the fluidized aerobic bioreactor 6 also includes a biochemical water tank float level gauge 63.

[0034] like Figure 1 As shown, the top of the fluidized anoxic bioreactor 5 is provided with a bacterial agent addition port 52 and an exhaust port 51; the box is filled with polyurethane filler occupying 30% of the box volume, and the anoxic circulation pump 53 is used to provide fluidization power for the filler; the MBR circulation pump 7 simultaneously returns part of the sludge in the fluidized aerobic bioreactor 6 to the fluidized anoxic bioreactor 5; the structure of the fluidized anoxic bioreactor 5 is optimized to facilitate the flow of sewage, reduce dead water areas, and make the filler in a good fluidized state in the box. An emptying port is provided at the bottom, and an interception net is installed to prevent the filler from being discharged from the emptying port.

[0035] like Figure 1As shown, the fluidized aerobic bioreactor 6 is provided with a bacterial agent addition port 62 and an exhaust port 61 at the top, and an inlet hole is provided on the side. The box is filled with polyurethane filler, which accounts for 30% of the box volume. The MBR circulation pump 7 provides fluidization power for the filler. A jet aerator 9 is used to oxygenate the sewage, and the water inlet to the jet aerator 9 is provided by the MBR circulation pump 7. The MBR circulation pump 7 works in conjunction with the aerobic liquid level gauge 63, that is, a "high start, low stop" operating mode. When the water level in the fluidized aerobic bioreactor 6 reaches the set high liquid level, the MBR circulation pump 7 is turned on to supply water to the ultrafiltration ceramic membrane 8. When the water level in the fluidized aerobic bioreactor 6 reaches the set low liquid level, the MBR circulation pump 7 is turned off. The structure of the fluidized aerobic bioreactor 6 has been optimized to facilitate sewage flow, reduce dead water areas, and ensure that the filler is in a good fluidized state within the box. A drain port is provided at the bottom, and an interception net is installed to prevent the filler from being discharged from the drain port.

[0036] In order to better illustrate the marine domestic sewage treatment device in this application, the use process of the marine domestic sewage treatment device is now described as follows:

[0037] In process 1, the ship's domestic sewage is treated by the rotary waste separator 3 and then enters the regulating water tank 2. Large pieces of waste are automatically separated, compressed, and transported out. The sewage in the regulating water tank 2 is circulated and crushed by the pulverizer pump 4, and the water is discharged in two ways. Part of the sewage enters the fluidized-bed anoxic bioreactor 5, and the remaining sewage flows back to the regulating water tank. The flow rate of sewage entering the fluidized-bed anoxic bioreactor 5 can be manually adjusted by adjusting the valve opening, thereby adjusting the average residence time of the biochemical process. The pulverizer pump 4 also serves as a discharge pump, pulverizing the ship's domestic sewage for discharge in unrestricted waters or emptying the entire facility. The regulating tank is equipped with a float-type liquid level transmitter, which activates the pulverizer pump at high liquid levels and automatically shuts it down at low liquid levels. At alarm levels, the device emits an audible and visual alarm.

[0038] In process 2, wastewater undergoes hydrolysis in the fluidized anoxic bioreactor 5 and then flows by gravity into the fluidized aerobic bioreactor 6. A low-lift anoxic circulation pump 53 is installed in the fluidized anoxic bioreactor 5 to provide fluidization power. An aerobic level gauge 63 is installed in the fluidized aerobic bioreactor 6, which activates the MBR circulation pump 7 when the liquid level is high and automatically shuts it down when the liquid level is low. At the alarm level, the device emits an audible and visual alarm. After each shutdown, a backwash sequence is automatically performed, returning all equipment to its initial state until the MBR circulation pump 7 resumes operation the next time the liquid level returns to a high level.

[0039] In process 3, the MBR circulation pump 7 draws water directly from the fluidized aerobic bioreactor 6. A double-layer filter is installed at the inlet, using a sheet grid + 2mm stainless steel filter to prevent MBBR fillers, fiber hair, and hard particles from entering the ultrafiltration ceramic membrane 8. When the flow rate in the MBR system stabilizes, the MBR circulation pump 7 is turned on, and the pressure in the membrane is increased to the value required by the process by adjusting the brine flow rate. Part of the brine is returned to the fluidized anoxic bioreactor 5, and the denitrification return ratio is adjusted by a manual regulating valve. The effluent can meet the latest standards in MPEC.227. (64) and the "Ship Water Pollutant Discharge Control Standard (GB3552-2018)" of the People's Republic of China.

[0040] In process 4, the MBR produced water first enters the backwash tank 10 for standby use. Once the backwash tank 10 is full, the overflow continues, sterilized by the UV sterilizer 11, and then discharged. Backwashing is primarily based on the liquid level in the fluidized aerobic bioreactor 6, the brine pressure of the ultrafiltration ceramic membrane 8, and the produced water flow rate. The backwash procedure is executed only when the fluidized aerobic bioreactor 6 is not in the high liquid level alarm state, and the brine pressure of the ultrafiltration ceramic membrane 8 is greater than the set value or the produced water flow rate is less than the set value. Furthermore, a backwash procedure is automatically executed if the continuous operation time exceeds the set value.

[0041] In step 5, backwash pressure is provided by the ship's compressed air. The electric backwash ball valve closes, sealing backwash tank 10. The compressed air valve (solenoid valve) opens, and the air source provides pressure to push backwash water from tank 10 into ultrafiltration ceramic membrane 8. After the backwash water is flushed, air is maintained for a period of time to perform air washing. The backwash process is completed within 10 minutes, so there is no need to stop the water supply to regulating water tank 2. The equipment then resumes normal operation.

[0042] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. An external MBR-MBBR combined marine domestic sewage treatment device, characterized by: The invention comprises a sewage inlet (1), a regulating water tank (2), a crushing pump (4), a fluidized anoxic bioreactor (5), a fluidized aerobic bioreactor (6), an MBR circulation pump (7), an ultrafiltration ceramic membrane (8), a jet aerator (9), a backwash tank (10), a standard water discharge port (12) and a drug washing tank (13); a rotating garbage separator (3) capable of automatically compressing and packing filtered particles is provided between the sewage inlet (1) and the regulating water tank (2); the rotating garbage separator (3) is arranged in the regulating water tank. The regulating water tank (2) is fixed on the water-saving tank (2); the regulating water tank (2), the pulverizing pump (4), the fluidized anoxic bioreactor (5), the fluidized aerobic bioreactor (6), the MBR circulation pump (7) and the ultrafiltration ceramic membrane (8) are connected in sequence along the water flow direction; the outlet of the ultrafiltration ceramic membrane (8) is respectively connected to the jet aerator (9) and the backwash tank (10); the jet aerator (9) is connected to the fluidized aerobic bioreactor (6); and the backwash tank (10) is connected to the qualified water discharge outlet (12).

2. The marine sewage treatment device according to claim 1, characterized in that: A water tank level gauge (21) is provided in the regulating water tank (2), and the water tank level gauge (21) is a float-type level gauge with adjustable upper and lower limits.

3. The marine sewage treatment device according to claim 1, characterized in that: A pulverizing direct discharge port (41) with a three-way valve is provided between the pulverizing pump (4) and the fluidized anoxic bioreactor (5).

4. The marine sewage treatment device according to claim 1, characterized in that: The fluidized anoxic bioreactor (5) comprises an exhaust port (51) and a bacterial agent addition port (52), an interception net for promoting fluidization is provided at the bottom, and an anoxic circulation pump (53) is provided on the outside.

5. The marine sewage treatment device according to claim 1, characterized in that: The fluidized aerobic bioreactor (6) is fixed integrally with the fluidized anoxic bioreactor (5); the fluidized aerobic bioreactor (6) is composed of two or more fluidized cycles.

6. The marine sewage treatment device according to claim 5, characterized in that: The fluidized aerobic bioreactor (6) comprises a second exhaust port (61) and a second bacterial agent addition port (62), an interception net for promoting fluidization is provided at the bottom, and an aerobic liquid level meter (63) is provided inside.

7. The marine sewage treatment device according to claim 1, characterized in that: The backwash tank (10) is provided with a compressed air interface (101); the drug washing box (13) is provided with a drug washing waste liquid discharge port (131), and the drug washing box (13) is connected to the ultrafiltration ceramic membrane (8).

8. The marine sewage treatment device according to claim 1, characterized in that: An ultraviolet sterilization lamp (11) is provided between the backwash tank (10) and the qualified water discharge port (12).

9. The marine sewage treatment device according to any one of claims 1 to 8, characterized in that: The regulating water tank (2), the fluidized anoxic bioreactor (5), the fluidized aerobic bioreactor (6), and the drug washing tank (13) are all provided with an emptying pipeline.

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