A ceramic flat sheet membrane-based kitchen wastewater treatment system

Abstract

The application relates to the technical field of kitchen wastewater treatment, and provides a kitchen wastewater treatment system based on ceramic flat plate membranes, which comprises a pretreatment unit, a membrane filtration and oil removal unit, a biochemical treatment unit and a deep treatment unit; the pretreatment unit comprises a multifunctional adjusting tank and an oil storage tank, a deslagging area, a desanding area, an oil removal area and an adjusting area are arranged in the multifunctional adjusting tank; the oil removal area is connected with the oil storage tank, and the adjusting area is connected with the membrane filtration and oil removal unit; the membrane filtration and oil removal unit comprises a membrane filtration tank, a selection tank and a clean water tank, a first ceramic flat plate membrane assembly is arranged in the membrane filtration tank, the selection tank is connected with inlet and outlet main pipes of the first ceramic flat plate membrane assembly, the biochemical treatment unit and a clean water area of the deep treatment unit, and the clean water tank is connected with inlet and outlet main pipes of the first ceramic flat plate membrane assembly; the membrane filtration tank, the biochemical treatment unit and the deep treatment unit are all connected with ozone generators. The kitchen wastewater treatment system has the advantages of simple pretreatment process, short process flow, good treatment effect, small dosage of chemicals, long service life and the like.

Description

Technical Field

[0001] This application belongs to the field of kitchen wastewater treatment technology, and more specifically, relates to a kitchen wastewater treatment system based on ceramic flat sheet membrane. Background Technology

[0002] Kitchen wastewater has a complex composition, characterized by high levels of organic matter, suspended solids, oil, and salt. The wastewater is black in color and emits an extremely unpleasant odor. If it is discharged directly into the city's pipe network without treatment, it will cause a shock load on the sewage treatment plant and affect its stable operation. However, if it is discharged into water bodies, it will cause environmental pollution, leading to severe oxygen deficiency in the water and thus affecting the aquatic ecosystem.

[0003] Currently, the treatment of kitchen wastewater mainly adopts processes such as coagulation sedimentation and air flotation. However, coagulation sedimentation and air flotation require the addition of a large amount of chemicals, resulting in high treatment costs. They are also easily affected by fluctuations in the influent of grease and suspended solids, leading to substandard effluent. In contrast, organic membranes in membrane separation have poor antifouling properties and short service life. Therefore, it is necessary to develop a kitchen wastewater treatment system with good treatment effect, low chemical dosage, simple process, and long service life. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this application is to provide a kitchen wastewater treatment system based on ceramic flat sheet membrane, which has the advantages of simple pretreatment process, short process flow, good treatment effect, low reagent dosage and long service life.

[0005] To achieve the above objectives, the technical solution adopted in this application is: to provide a kitchen wastewater treatment system based on ceramic flat sheet membrane, including: a pretreatment unit, a membrane filtration oil removal unit, a biochemical treatment unit, and a deep treatment unit;

[0006] The pretreatment unit includes a multi-functional equalization tank and an oil storage tank. The multi-functional equalization tank is equipped with a slag removal zone, a sand removal zone, an oil removal zone, and an equalization zone. The oil removal zone is connected to the oil storage tank, and the equalization zone is connected to the membrane filtration oil removal unit.

[0007] The membrane filtration oil removal unit includes a membrane filtration tank, a selection tank, and a clear water tank. The membrane filtration tank is equipped with a first ceramic flat sheet membrane module. The selection tank is connected to the inlet and outlet main pipe of the first ceramic flat sheet membrane module and the biochemical treatment unit. The clear water tank is connected to the inlet and outlet main pipe of the first ceramic flat sheet membrane module and the clear water zone of the deep treatment unit. The membrane filtration tank, the biochemical treatment unit, and the deep treatment unit are all connected to an ozone generator.

[0008] In one embodiment, the slag removal zone and the oil removal zone are separated by a first partition, the oil removal zone and the regulating zone are separated by a second partition, the bottoms of the slag removal zone and the oil removal zone are connected to form the sand removal zone, the top of the slag removal zone is provided with a grid, the second partition is a closed plate, the oil removal zone and the regulating zone are connected by a water pipe, the water pipe is an L-shaped pipe and the water inlet is lower than the liquid level of the oil removal zone.

[0009] In one embodiment, the bottom of the slag removal zone is equipped with a stirring device, the oil removal zone is equipped with an oil discharge pump connected to an oil storage tank via a pipeline, the regulating zone is equipped with a lift pump connected to a membrane filter tank via a pipeline, and the bottom of the sand removal zone is equipped with a sludge storage tank and a sludge discharge pipe.

[0010] In one embodiment, the inlet and outlet main pipe is connected to the selection tank via a water production device, and the inlet and outlet main pipe is connected to the clear water tank via a backwashing device. The water production device and the backwashing device are connected in parallel and work alternately. The top of the membrane filtration tank is provided with an overflow trough, and the overflow trough is connected to the oil storage tank via an oil drain pipe.

[0011] In one embodiment, the biochemical treatment unit includes a denitrification and phosphorus removal biochemical tank and a membrane separation tank. The denitrification and phosphorus removal biochemical tank contains an anaerobic zone, an anoxic zone, and an aerobic zone in sequence. The membrane separation tank is equipped with a second ceramic flat-plate membrane module.

[0012] In one embodiment, the deep treatment unit includes an ozone activated carbon filter, which has an ozone disinfection zone, an activated carbon filtration zone, and a clear water zone arranged sequentially from bottom to top. The ozone disinfection zone is connected to the water production device of the second ceramic flat sheet membrane module, and the clear water zone is connected to the backwashing device of the second ceramic flat sheet membrane module.

[0013] In one embodiment, the ozone generator is connected via several pipes to the bottom of the membrane filtration tank, the inlet and outlet main pipe of the first ceramic flat sheet membrane module, the bottom of the membrane separation tank, the inlet and outlet main pipe of the second ceramic flat sheet membrane module, and the ozone disinfection zone.

[0014] In one embodiment, the membrane filtration tank, the biochemical treatment tank, the membrane separation tank, and the ozone disinfection zone are all connected to an aeration device.

[0015] In one embodiment, the aeration devices share a single blower.

[0016] The beneficial effects of the kitchen wastewater treatment system based on ceramic flat sheet membrane provided in this application are as follows:

[0017] 1. By integrating the pretreatment unit, membrane filtration oil removal unit, biochemical treatment unit and deep treatment unit into one unit, it can simultaneously remove multiple pollutants, with simple pretreatment, short process flow, good treatment effect, no need to add a large amount of reagents, and the ceramic flat sheet membrane has a long service life and low operation and maintenance cost.

[0018] 2. Ozone-enhanced ceramic flat sheet membrane backwashing and enhanced post-activated carbon filtration for deep treatment not only enhance the ozone oxidation effect, but also strengthen the air and water washing of the ceramic flat sheet membrane, achieving ultra-strong cleaning, reducing the use of chemical backwashing agents, lowering the backwashing frequency, and extending its service life. Furthermore, combined with activated carbon, it disinfects and deeply treats the biological wastewater, removing pollutants. Simultaneously, the ozone oxidation of the exhaust gas and the generated oxygen can be used to clean the activated carbon, which in turn enhances the ozone oxidation effect, preventing activated carbon clogging and extending its service life.

[0019] 3. By setting up oil storage tanks, the resource recovery of animal and vegetable oils in kitchen wastewater can be achieved. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is an exploded structural diagram of a kitchen wastewater treatment system based on a ceramic flat sheet membrane, provided in an embodiment of this application.

[0022] The following are the labeling elements in the figure:

[0023] 1. Bar screen; 2. Slag removal zone; 3. Mixing device; 4. Multifunctional equalization tank; 5. Sand removal zone; 6. Equalization zone; 7. Booster pump; 8. Oil removal zone; 9. Oil discharge pump; 10. Oil storage tank; 11. Membrane filtration tank; 12. First ceramic flat sheet membrane module; 13. Selector tank; 14. Denitrification and phosphorus removal biochemical tank; 15. Membrane separation tank; 16. Ozone activated carbon filtration tank; 17. Ozone disinfection zone; 18. Activated carbon filtration zone; 19. Clear water zone; 20. Ozone generator; 21. Blower; 22. Water washing device; 23. Water production device; 24. Clear water tank. Detailed Implementation

[0024] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0025] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0026] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0028] like Figure 1 As shown, a kitchen wastewater treatment system based on a ceramic flat sheet membrane provided in this application will now be described.

[0029] The kitchen wastewater treatment system based on ceramic flat sheet membrane includes: a pretreatment unit, a membrane filtration oil removal unit, a biochemical treatment unit, and a deep treatment unit connected in sequence.

[0030] The pretreatment unit includes a multi-functional equalization tank 4 and an oil storage tank 10. The multi-functional equalization tank 4 is equipped with a slag removal zone 2, a sand removal zone 5, an oil removal zone 8, and an equalization zone 6 through which wastewater flows sequentially, thus providing functions such as slag removal, oil removal, sand removal, and water quality and quantity adjustment. The oil removal zone 8 is connected to the oil storage tank 10 and is used for the resource recovery and utilization of animal and vegetable oils in the kitchen wastewater. The equalization zone 6 is connected to the membrane filtration oil removal unit, through which the pretreated wastewater is discharged for further treatment.

[0031] The membrane filtration oil removal unit includes a membrane filtration tank 11, a selection tank 13, and a clear water tank 24. The membrane filtration tank 11 houses a first ceramic flat-plate membrane module 12, which treats the incoming and outgoing wastewater using the ceramic flat-plate membrane. The selection tank 13 receives the wastewater treated by the first ceramic flat-plate membrane module 12. The clear water tank 24 receives tap water and clear water obtained from subsequent advanced treatment units. The selection tank 13 is connected to the inlet and outlet main pipes of the first ceramic flat-plate membrane module 12 and the biochemical treatment unit. The clear water tank 24 is connected to the inlet and outlet main pipes of the first ceramic flat-plate membrane module 12 and the clear water zone 19 of the advanced treatment unit. The clear water tank 24 is used for online backwashing of the first ceramic flat-plate membrane module 12.

[0032] Among them, the membrane filtration tank 11, the biochemical treatment unit and the deep treatment unit are all connected to the ozone generator 20, which can perform ozone oxidation, aeration and ozone backwashing of the first ceramic flat sheet membrane module 12, realizing multiple uses of one product.

[0033] Specifically, in this embodiment, the slag removal zone 2 and oil removal zone 8 of the multi-functional equalization tank 4 are both located above the sand removal zone 5. The slag removal zone 2 and oil removal zone 8 are separated by a first partition, and there is a channel between the bottom of the first partition and the bottom of the multi-functional equalization tank 4. The oil removal zone 8 and the equalization zone 6 are separated by a second partition. The bottoms of the slag removal zone 2 and the oil removal zone 8 are connected to form the sand removal zone 5. The top of the slag removal zone 2 is equipped with a grid 1, and wastewater first passes through the grid 1 for coarse filtration. The second partition is a closed plate. The oil removal zone 8 and the equalization zone 6 are connected by a water pipe. The water pipe is an L-shaped pipe, and the inlet end is lower than the liquid level of the oil removal zone 8. This is to minimize the risk of floating oil on the upper layer of the oil removal zone 8 entering the equalization zone 6. The inlet end of the water pipe is higher than the slag removal zone 2 to minimize the risk of bottom sediment entering the equalization zone 6.

[0034] In this embodiment, the bottom of the slag removal zone 2 is equipped with a stirring device 3. The stirring is carried out using one or more of the following: a submersible mixer, a submersible jet mixer, and a gas mixer, to separate the grease from the wastewater as much as possible. The oil removal zone 8 is equipped with an oil discharge pump 9, which is connected to an oil storage tank 10 through a pipeline. The oil discharge pump 9 is used to extract the grease and discharge it into the oil storage tank 10. The regulating zone 6 is equipped with a lift pump 7, which is connected to a membrane filter tank 11 through a pipeline. The lift pump 7 is used to pump the wastewater from the regulating zone 6 into the membrane filter tank 11. The bottom of the sand removal zone 5 is equipped with a sludge storage tank and a sludge discharge pipe. The sludge storage tank is located away from the stirring device 3 and is used to collect and discharge the sediment.

[0035] In this embodiment, the first inlet and outlet manifold of the first ceramic flat sheet membrane module 12 is connected to the selection tank 13 via the first product water device 23, and the first inlet and outlet manifold is connected to the clear water tank 24 via the first backwash device. The first product water device 23 and the first backwash device are connected in parallel and operate alternately. The top of the membrane filter tank 11 is provided with an overflow trough, which is connected to the oil storage tank 10 via an oil discharge pipe for oil recovery and reuse. The product water device 23 is used to discharge the treated wastewater into the selection tank 13 for collection. The selection tank 13 not only deoxygenates the effluent from the membrane filter tank 11, but also inhibits sludge bulking and selects dominant bacterial groups. At the same time, it can be mixed with the return nitrification liquid from the aerobic tank to achieve denitrification. The first backwash device is used to backwash the first ceramic flat sheet membrane module 12 with water from the clear water tank 24 to ensure the service life of the membrane.

[0036] The first water production device 23 includes a water production pipe and a water production pump and a water production valve installed on the water production pipe. One end of the water production pipe is connected to the first inlet / outlet main pipe of the first ceramic flat sheet membrane module 12, and the other end is connected to the selection tank 13. Water treated by the first ceramic flat sheet membrane module 12 is discharged through the first inlet / outlet main pipe and enters the water production pipe. Under the action of the water production pump, it is pumped into the selection tank 13 for collection. The first backwashing device includes a backwashing pipe and a backwashing pump and a backwashing valve installed on the backwashing pipe. One end of the backwashing pipe is connected to the first inlet / outlet main pipe of the first ceramic flat sheet membrane module, and the other end is connected to the clear water tank 24. In this embodiment, the backwashing pipe and the water production pipe are connected in parallel. When producing water, the water production valve and the water production pump are open, and the backwashing valve and the backwashing pump are closed; when backwashing, the water production valve and the water production pump are closed, and the backwashing valve and the backwashing pump are open. Preferably, the backwashing pipe can also be connected to a dosing device through a pipeline. The dosing device can provide an alkaline solution or an acid solution for acid-base backwashing of the first ceramic flat sheet membrane module 12.

[0037] In this embodiment, the biochemical treatment unit includes a nitrogen and phosphorus removal biochemical tank 14 and a membrane separation tank 15. The nitrogen and phosphorus removal biochemical tank 14 contains sequentially anaerobic, anoxic, and aerobic zones. The membrane separation tank 15 is equipped with a second ceramic flat-plate membrane module. The structure of the second ceramic flat-plate membrane module is the same as that of the first ceramic flat-plate membrane module 12, both using existing structures, such as those made from fly ash, gasification slag, alumina, etc. The second ceramic flat-plate membrane module includes a second inlet and outlet manifold, a second backwashing device, and a second product water device.

[0038] In this embodiment, the deep treatment unit includes an ozone activated carbon filter. The ozone activated carbon filter is provided with an ozone disinfection zone 17, an activated carbon filtration zone 18 and a clear water zone 19 from bottom to top. The ozone disinfection zone 17 is connected to the second water production device 23 of the second ceramic flat sheet membrane module, and the clear water zone 19 is connected to the second backwashing device of the second ceramic flat sheet membrane module.

[0039] Specifically, the ozone generator 20 is connected via several pipes to the bottom of the membrane filtration tank 11, the first inlet and outlet main pipe of the first ceramic flat plate membrane module 12, the bottom of the membrane separation tank 15, the second inlet and outlet main pipe of the second ceramic flat plate membrane module, and the ozone disinfection zone 17. Each pipe is equipped with a corresponding valve, thus enabling ozone oxidation, ozone aeration, and ozone backwashing as needed. Ozone backwashing can include ozone oxygen washing and ozone water backwashing.

[0040] In this embodiment, the membrane filtration tank 11, the biochemical treatment tank, the membrane separation tank 15, and the ozone disinfection zone 17 are all connected to aeration devices to provide corresponding aeration requirements. Each aeration device includes several aeration pipes, aeration discs, and a blower 21. The ozone generator 20 is connected to the aeration pipes of the aeration device via pipes. All aeration pipes of the aeration device share a single blower 21, and each aeration pipe is equipped with a valve to adjust the aeration level.

[0041] Ozone can not only work in conjunction with air from the aeration device during normal operation to aerate and flush the ceramic flat sheet membrane, thus mitigating membrane fouling, but it can also be used during clean water or acid / alkali backwashing to enhance the backwashing effect. Ozone backwashing from the inside of the membrane removes pollutants adhering to the membrane, extending the service life of the ceramic flat sheet membrane. At the same time, ozone oxidation can be used to degrade pollutants, and its oxidation exhaust gas can play a certain role in air flotation, facilitating oil removal by the membrane filtration oil removal unit.

[0042] In the ozone-activated carbon filtration tank 16, water flows from bottom to top. The effluent from the ozone disinfection zone 17 enters the activated carbon filtration zone 18, where it is filtered by activated carbon before entering the clear water zone 19. Finally, it is discharged from the top via an overflow weir. This system not only utilizes ozone oxidation for deep treatment of pollutants and disinfection of the effluent, but also degrades pollutants adsorbed by the activated carbon and backwashes the activated carbon, while simultaneously removing pollutants through activated carbon adsorption.

[0043] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A ceramic flat sheet membrane based kitchen wastewater treatment system, characterized by, include: Pretreatment unit, membrane filtration oil removal unit, biochemical treatment unit, and deep treatment unit; The pretreatment unit includes a multi-functional regulating tank (4) and an oil storage tank (10). The multi-functional regulating tank (4) is provided with a slag removal zone (2), a sand removal zone (5), an oil removal zone (8), and a regulating zone (6). The oil removal zone (8) is connected to the oil storage tank (10), and the regulating zone (6) is connected to the membrane filtration oil removal unit. The membrane filtration oil removal unit includes a membrane filtration tank (11), a selection tank (13), and a clear water tank (24). The membrane filtration tank (11) contains a first ceramic flat-plate membrane module (12). The selection tank (13) is connected to the inlet and outlet manifold of the first ceramic flat-plate membrane module (12) and the biochemical treatment unit. The clear water tank (24) is connected to the inlet and outlet manifold of the first ceramic flat-plate membrane module (12) and the clear water zone (19) of the deep treatment unit. The membrane filtration tank (11), the biochemical treatment unit, and the deep treatment unit are all connected to... Ozone generator (20); The biochemical treatment unit includes a denitrification and phosphorus removal biochemical tank (14) and a membrane separation tank (15). The denitrification and phosphorus removal biochemical tank (14) contains an anaerobic zone, an anoxic zone and an aerobic zone in sequence. The membrane separation tank (15) is equipped with a second ceramic flat plate membrane module. The ozone generator (20) is connected to the bottom of the membrane filtration tank (11), the inlet and outlet main pipe of the first ceramic flat plate membrane module (12), the bottom of the membrane separation tank (15), the inlet and outlet main pipe of the second ceramic flat plate membrane module and the ozone disinfection zone (17) through several pipes respectively. The inlet and outlet main pipe is connected to the selection tank (13) through the water production device (23), and the inlet and outlet main pipe is connected to the clear water tank (24) through the backwashing device. The water production device (23) and the backwashing device are connected in parallel and work alternately. The top of the membrane filter tank (11) is provided with an overflow trough, and the overflow trough is connected to the oil storage tank (10) through the oil discharge pipe. The deep treatment unit includes an ozone activated carbon filter, which is provided with an ozone disinfection zone (17), an activated carbon filtration zone (18), and a clear water zone (19) from bottom to top. The ozone disinfection zone (17) is connected to the water production device (23) of the second ceramic flat sheet membrane module, and the clear water zone (19) is connected to the backwashing device of the second ceramic flat sheet membrane module. The membrane filtration tank (11), the biochemical treatment tank, the membrane separation tank (15), and the ozone disinfection zone (17) are all connected to an aeration device; The ozone generator (20) is connected to the aeration pipe of the aeration device via a pipe.

2. The kitchen wastewater treatment system based on ceramic flat sheet membrane as described in claim 1, characterized in that: The slag removal zone (2) and the oil removal zone (8) are separated by a first partition, and the oil removal zone (8) and the regulating zone (6) are separated by a second partition. The bottoms of the slag removal zone (2) and the oil removal zone (8) are connected to form the sand removal zone (5). The top of the slag removal zone (2) is provided with a grid (1). The second partition is a closed plate. The oil removal zone (8) and the regulating zone (6) are connected by a water pipe. The water pipe is an L-shaped pipe and the water inlet is lower than the liquid level of the oil removal zone (8).

3. The kitchen wastewater treatment system based on ceramic flat sheet membrane as described in claim 2, characterized in that: The bottom of the slag removal zone (2) is equipped with a stirring device (3), the oil removal zone (8) is equipped with an oil discharge pump (9), the oil discharge pump (9) is connected to the oil storage tank (10) through a pipe, the adjustment zone (6) is equipped with a lifting pump (7), the lifting pump (7) is connected to the membrane filter tank (11) through a pipe, and the bottom of the sand removal zone (5) is equipped with a sludge storage tank and a sludge discharge pipe.

4. The kitchen wastewater treatment system based on ceramic flat sheet membrane as described in claim 3, characterized in that: The aeration devices share a single blower (21).

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