Kitchen wastewater treatment system based on ceramic flat sheet membrane

Abstract

The invention relates to the technical field of kitchen wastewater treatment, and provides a kitchen wastewater treatment system based on a ceramic flat sheet membrane, which comprises a pretreatment unit, a membrane filtration 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, and a slag removal area, a sand removal 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 pool, and the adjusting area is connected with the membrane filtration oil removal unit; the membrane filtration oil removal unit comprises a membrane filtration tank, a selection tank and a clean water tank, a first ceramic flat sheet membrane assembly is arranged in the membrane filtration tank, the selection tank is connected with a main inlet / outlet pipe of the first ceramic flat sheet membrane assembly and the biochemical treatment unit, and the clean water tank is connected with the main inlet / outlet pipe of the first ceramic flat sheet membrane assembly and a clean water area of the deep treatment unit; the membrane filter tank, the biochemical treatment unit and the deep treatment unit are connected with an ozone generator. The method has the advantages of simple pretreatment process, short process flow, good treatment effect, small medicament dosage, long service life and the like.

Description

Technical Field

[0001] The present application belongs to the technical field of restaurant wastewater treatment, and more specifically, to a restaurant wastewater treatment system based on a ceramic flat membrane. Background Art

[0003] The composition of kitchen wastewater is complex, with characteristics such as high organic matter, high suspended solids, high oil, and high salt. The wastewater is black in color and emits an extremely unpleasant odor. If it is discharged directly into the urban pipeline network without treatment, it will cause an impact load on the sewage treatment plant and affect the stable operation of the sewage treatment plant. However, if it is discharged into the water body, it will cause environmental pollution and lead to severe hypoxia in the water body, thus affecting the water ecology.

[0004] At present, coagulation sedimentation, flotation and other processes are mostly used for the treatment of restaurant wastewater. However, coagulation sedimentation, flotation and other processes require the addition of a large amount of chemicals, which has high treatment costs and is easily affected by the fluctuation of water inlet such as grease and suspended matter, resulting in substandard effluent. The organic membrane in membrane separation has poor pollution resistance and a short service life. Therefore, it is necessary to develop a restaurant wastewater treatment system with good treatment effect, low dosage of chemicals, simple process and long service life. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the embodiments of the present application is to provide a food wastewater treatment system based on a ceramic flat membrane, which has the advantages of simple pretreatment process, short process flow, good treatment effect, small amount of chemical addition, and long service life.

[0006] To achieve the above-mentioned purpose, the technical solution adopted in this application is: to provide a kitchen wastewater treatment system based on ceramic flat membrane, including: a pretreatment unit, a membrane filtration and oil removal unit, a biochemical treatment unit and a deep treatment unit;

[0007] The pretreatment unit comprises a multifunctional regulating tank and an oil storage tank, wherein the multifunctional regulating tank is provided with a slag removal area, a sand removal area, an oil removal area and a regulating area; the oil removal area is connected to the oil storage tank, and the regulating area is connected to the membrane filtration oil removal unit;

[0008] The membrane filtration oil removal unit includes a membrane filtration pool, a selection pool and a clear water pool. A first ceramic flat membrane assembly is arranged in the membrane filtration pool. The selection pool is connected to the inlet and outlet main pipe of the first ceramic flat membrane assembly and the biochemical treatment unit. The clear water pool is connected to the inlet and outlet main pipe of the first ceramic flat membrane assembly and the clear water area of ​​the deep treatment unit. The membrane filtration pool, the biochemical treatment unit and the deep treatment unit are all connected to an ozone generator.

[0009] In one embodiment, the deslagging zone and the oil removal zone are separated by a first partition, the oil removal zone and the adjustment zone are separated by a second partition, the bottoms of the deslagging zone and the oil removal zone are connected to form the desanding zone, a grid is provided on the top of the deslagging zone, the second partition is a closed plate, the oil removal zone and the adjustment zone are connected by a water pipe, the water pipe is an L-shaped pipe and the water inlet end is lower than the liquid level of the oil removal zone.

[0010] In one embodiment, a stirring device is provided at the bottom of the slag removal zone, an oil discharge pump is provided at the oil removal zone, the oil discharge pump is connected to the oil storage tank through a pipeline, a lifting pump is provided at the adjustment zone, the lifting pump is connected to the membrane filtration tank through a pipeline, and a mud storage tank and a mud discharge pipe are provided at the bottom of the sand removal zone.

[0011] In one embodiment, the inlet and outlet main pipes are connected to the selection tank via a water production device, and the inlet and outlet main pipes are connected to the clean water tank via a backwash device, and the water production device and the backwash device are connected in parallel and work alternately; an overflow tank is provided at the top of the membrane filtration tank, and the overflow tank is connected to the oil storage tank via an oil discharge pipe.

[0012] In one embodiment, the biochemical treatment unit includes a denitrification and phosphorus removal biochemical pool and a membrane separation pool. The denitrification and phosphorus removal biochemical pool has an anaerobic zone, an anoxic zone and an aerobic zone in sequence. The membrane separation pool is provided with a second ceramic flat membrane assembly.

[0013] In one embodiment, the deep treatment unit includes an ozone activated carbon filter tank, in which an ozone disinfection zone, an activated carbon filtration zone and a clean water zone are arranged from bottom to top, the ozone disinfection zone is connected to the water production device of the second ceramic flat membrane assembly, and the clean water zone is connected to the backwash device of the second ceramic flat membrane assembly.

[0014] In one embodiment, the ozone generator is connected to the bottom of the membrane filtration tank, the inlet and outlet main pipe of the first ceramic flat membrane assembly, the bottom of the membrane separation tank, the inlet and outlet main pipe of the second ceramic flat membrane assembly and the ozone disinfection area through several pipelines.

[0015] In one embodiment, the membrane filtration tank, the biochemical treatment tank, the membrane separation tank and the ozone disinfection area are all connected to an aeration device.

[0016] In one embodiment, the aeration devices share a fan.

[0017] The beneficial effects of the kitchen wastewater treatment system based on ceramic flat membrane provided in this application are:

[0018] 1. By integrating the pretreatment unit, membrane filtration oil removal unit, biochemical treatment unit and deep treatment unit, it can remove multiple pollutants simultaneously, with simple pretreatment, short process flow and good treatment effect. At the same time, it does not require a large amount of chemicals to be added, and the ceramic flat membrane has a long service life and low operation and maintenance costs.

[0019] 2. Ozone-enhanced ceramic flat membrane backwashing and enhanced post-activated carbon filtration deep treatment are not only beneficial to the enhanced effect of ozone oxidation, but also enhance the air washing and water washing of the ceramic flat membrane to achieve super-strong cleaning of the ceramic flat membrane, reduce the use of chemical backwashing agents, reduce the backwashing frequency, and extend the service life; on the other hand, combined with activated carbon, the biochemical tail water is disinfected and deeply treated to remove pollutants. At the same time, the ozone oxidation tail gas and the generated oxygen activated carbon can be used for cleaning, and the activated carbon can enhance the ozone oxidation effect, avoid activated carbon clogging, and extend the service life.

[0020] 3. By setting up an oil storage tank, the resource recovery of animal and plant oils in kitchen wastewater can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic diagram of the explosion structure of a kitchen wastewater treatment system based on a ceramic flat membrane provided in an embodiment of the present application.

[0023] Among them, the reference numerals in the figure are:

[0024] 1. Grid; 2. Deslagging area; 3. Stirring device; 4. Multifunctional regulating tank; 5. Desanding area; 6. Regulating area; 7. Lifting pump; 8. Oil removal area; 9. Oil discharge pump; 10. Oil storage tank; 11. Membrane filtration tank; 12. First ceramic flat membrane assembly; 13. Selection tank; 14. Denitrification and phosphorus removal biochemical tank; 15. Membrane separation tank; 16. Ozone activated carbon filtration tank; 17. Ozone disinfection area; 18. Activated carbon filtration area; 19. Clean water area; 20. Ozone generator; 21. Fan; 22. Water washing device; 23. Water production device; 24. Clean water tank. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0027] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] like Figure 1 As shown, a kitchen wastewater treatment system based on a ceramic flat membrane provided in an embodiment of the present application is now described.

[0030] The kitchen wastewater treatment system based on ceramic flat membranes comprises: a pretreatment unit, a membrane filtration oil removal unit, a biochemical treatment unit and a deep treatment unit which are connected in sequence.

[0031] The pretreatment unit includes a multifunctional regulating tank 4 and an oil storage tank 10. The multifunctional regulating tank 4 is provided with a slag removal area 2, a sand removal area 5, a degreasing area 8 and a regulating area 6 for wastewater to flow through in sequence, so as to have the functions of slag removal, oil removal, sand removal and water quality and quantity regulation; the degreasing area 8 is connected to the oil storage tank 10 to recycle the animal and plant oils in the kitchen wastewater. The regulating area 6 is connected to the membrane filtration degreasing unit, and the wastewater after pretreatment is discharged from the membrane filtration degreasing unit for treatment.

[0032] 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 is provided with a first ceramic flat membrane assembly 12, and the ceramic flat membrane is used to treat the inlet and outlet of wastewater. The selection tank 13 is used to receive wastewater treated by the first ceramic flat membrane assembly 12, and the clear water tank 24 is used to receive tap water and the clear water obtained in the subsequent deep treatment unit. The selection tank 13 is connected to the inlet and outlet main pipe of the first ceramic flat membrane assembly 12 and the biochemical treatment unit, and the clear water tank 24 is connected to the inlet and outlet main pipe of the first ceramic flat membrane assembly 12 and the clear water area 19 of the deep treatment unit; the clear water tank 24 is used to realize online backwashing of the first ceramic flat membrane assembly 12.

[0033] The membrane filtration tank 11, the biochemical treatment unit and the deep treatment unit are all connected to an ozone generator 20, which can perform ozone oxidation and aeration on the wastewater and ozone backwash on the first ceramic flat membrane assembly 12, thus achieving multiple uses of one item.

[0034] Specifically, in this embodiment, the deslagging area 2 and the deoiling area 8 of the multifunctional regulating tank 4 are both located at the upper part of the desanding area 5, the deslagging area 2 and the deoiling area 8 are separated by a first partition, a channel is provided between the bottom of the first partition and the bottom of the multifunctional regulating tank 4, the deoiling area 8 and the regulating area 6 are separated by a second partition, the bottoms of the deslagging area 2 and the deoiling area 8 are connected to form the deslagging area 5, a grid 1 is provided on the top of the deslagging area 2, and wastewater is first coarsely filtered through the grid 1 when it is introduced. The second partition is a closed plate, the deoiling area 8 and the regulating area 6 are connected by a water pipe, the water pipe is an L-shaped pipe and the water inlet end is lower than the liquid level of the deoiling area 8, so as to avoid the floating oil on the upper layer of the deoiling area 8 from entering the regulating area 6 as much as possible, and the water inlet end of the water pipe is higher than the deslagging area 2, so as to avoid the bottom sediment from entering the regulating area 6 as much as possible.

[0035] In this embodiment, a stirring device 3 is provided at the bottom of the deslagging zone 2, and the stirring adopts one or more of a submersible mixer, a submersible flow propeller, and a gas stirring, so as to separate the grease in the wastewater as much as possible. The degreasing zone 8 is provided with an oil discharge pump 9, which is connected to the oil storage tank 10 through a pipeline, and 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 provided with a lifting pump 7, which is connected to the membrane filtration tank 11 through a pipeline, and the lifting pump 7 is used to pump the wastewater of the regulating zone 6 into the membrane filtration tank 11. A mud storage tank and a mud discharge pipe are provided at the bottom of the desanding zone 5, and the mud storage tank is far away from the stirring device 3, and is used to collect and discharge the sediment.

[0036] In this embodiment, the first inlet and outlet main pipe of the first ceramic flat membrane assembly 12 is connected to the selection tank 13 through the first water production device 23, and the first inlet and outlet main pipe is connected to the clean water tank 24 through the first backwash device. The first water production device 23 and the first backwash device are connected in parallel and work alternately; an overflow tank is provided on the top of the membrane filter tank 11, and the overflow tank is connected to the oil storage tank 10 through an oil discharge pipe for oil recovery. The water production device 23 is used to discharge the treated wastewater into the selection tank 13 for collection. The selection tank 13 not only plays the role of deoxygenating the effluent of the membrane filter tank 11, but also has the role of inhibiting sludge swelling and selecting dominant bacteria. At the same time, it can be mixed with the reflux nitrification liquid of the aerobic tank to play a role in denitrification. The first backwash device is used to backwash the first ceramic flat membrane assembly 12 with water in the clean water tank 24 to ensure the service life of the membrane.

[0037] The first water production device 23 includes a water production pipe and a water production pump and a water production valve arranged on the water production pipe. One end of the water production pipe is connected to the first inlet and outlet main pipe of the first ceramic flat membrane assembly 12, and the other end is connected to the selection tank 13. The water treated by the first ceramic flat membrane assembly 12 is discharged into the water production pipe through the first inlet and outlet main pipe, and is pumped into the selection tank 13 for collection under the action of the water production pump. The first backwashing device includes a backwashing pipe and a backwashing pump and a backwashing valve arranged on the backwashing pipe. One end of the backwashing pipe is connected to the first inlet and outlet main pipe of the first ceramic flat assembly, and the other end is connected to the clean water tank 24. In this embodiment, the backwashing pipe and the water production pipe are connected in parallel. When water is produced, the water production valve and the water production pump are opened, 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 opened. Preferably, the backwashing pipe can also be connected to the dosing device through a pipeline, and the dosing device can provide an alkaline solution or an acid solution for acid-base backwashing of the first ceramic flat membrane assembly 12.

[0038] In this embodiment, the biochemical treatment unit includes a denitrification and dephosphorization biochemical pool 14 and a membrane separation pool 15. The denitrification and dephosphorization biochemical pool 14 has an anaerobic zone, an anoxic zone and an aerobic zone in sequence. The membrane separation pool 15 is provided with a second ceramic flat membrane assembly. The structure of the second ceramic flat membrane assembly is the same as that of the first ceramic flat membrane assembly 12. Both adopt existing structures, such as being fired from raw materials such as fly ash, gasified slag, and alumina. The second ceramic flat membrane assembly includes a second inlet and outlet main pipe, a second backwash device, and a second water production device.

[0039] In this embodiment, the deep treatment unit includes an ozone activated carbon filter tank, in which an ozone disinfection zone 17, an activated carbon filtration zone 18 and a clean water zone 19 are arranged from bottom to top. The ozone disinfection zone 17 is connected to the second water production device 23 of the second ceramic flat membrane assembly, and the clean water zone 19 is connected to the second backwash device of the second ceramic flat membrane assembly.

[0040] Specifically, the ozone generator 20 is connected to the bottom of the membrane filtration tank 11, the first inlet and outlet main pipe of the first ceramic flat membrane assembly 12, the bottom of the membrane separation tank 15, the second inlet and outlet main pipe of the second ceramic flat membrane assembly and the ozone disinfection area 17 through a plurality of pipelines, and corresponding valves are provided on each pipeline, so that ozone oxidation, ozone aeration and ozone backwashing can be achieved according to demand. Among them, ozone backwashing can include ozone gas washing and ozone backwashing.

[0041] In this embodiment, the membrane filtration tank 11, the biochemical treatment tank, the membrane separation tank 15 and the ozone disinfection area 17 are all connected to an aeration device to provide corresponding aeration requirements; the aeration device includes a plurality of aeration pipes, an aeration disk and a fan 21, and the ozone generator 20 is connected to the aeration pipe of the aeration device through a pipe. Among them, all aeration pipes of the aeration device share a fan 21, and valves are provided on the aeration pipes to adjust the aeration size.

[0042] Ozone can not only combine with the air in the aeration device during normal operation to aerate and flush the ceramic flat membrane to reduce membrane pollution, but also can be used in clean water or acid-base backwashing to enhance the backwashing effect, perform ozone backwashing from the inside of the membrane, remove pollutants attached to the membrane, and increase the service life of the ceramic flat membrane. At the same time, ozone oxidation can be used to degrade pollutants, and its oxidized tail gas can play a certain flotation role, which is convenient for membrane filtration and oil removal unit to remove oil.

[0043] The water in the ozone activated carbon filter pool 16 flows from bottom to top, and the effluent from the ozone disinfection area 17 enters the activated carbon filter area 18 and enters the clean water area 19 after being filtered by activated carbon, and then is discharged from the top through the overflow weir. Not only can the pollutants be deeply treated and the effluent disinfected by ozone oxidation, but also the pollutants adsorbed by the activated carbon can be degraded by ozone and the activated carbon can be backwashed, while the activated carbon adsorbs and removes pollutants.

[0044] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A kitchen wastewater treatment system based on ceramic flat membrane, characterized in that: include: Pretreatment unit, membrane filtration oil removal unit, biochemical treatment unit and deep treatment unit; The pretreatment unit comprises a multifunctional regulating tank (4) and an oil storage tank (10); the multifunctional regulating tank (4) is provided with a slag removal area (2), a sand removal area (5), an oil removal area (8) and an regulating area (6); the oil removal area (8) is connected to the oil storage tank (10), and the regulating area (6) is connected to the membrane filtration oil removal unit; The membrane filtration oil removal unit comprises a membrane filtration pool (11), a selection pool (13) and a clear water pool (24); a first ceramic flat membrane assembly (12) is arranged in the membrane filtration pool (11); the selection pool (13) is connected to the inlet and outlet main pipes of the first ceramic flat membrane assembly (12) and the biochemical treatment unit; the clear water pool (24) is connected to the inlet and outlet main pipes of the first ceramic flat membrane assembly (12) and the clear water area (19) of the deep treatment unit; the membrane filtration pool (11), the biochemical treatment unit and the deep treatment unit are all connected to an ozone generator (20).

2. The kitchen wastewater treatment system based on ceramic flat membrane according to claim 1, characterized in that: The deslagging zone (2) and the oil removal zone (8) are separated by a first partition, the oil removal zone (8) and the regulating zone (6) are separated by a second partition, the bottoms of the deslagging zone (2) and the oil removal zone (8) are connected to form the deslagging zone (5), a grid (1) is provided on the top of the deslagging zone (2), 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 end is lower than the liquid level of the oil removal zone (8).

3. The kitchen wastewater treatment system based on ceramic flat membrane according to claim 2, characterized in that: The bottom of the deslagging zone (2) is provided with a stirring device (3), the deoiling zone (8) is provided with an oil discharge pump (9), the oil discharge pump (9) is connected to an oil storage tank (10) through a pipeline, the regulating zone (6) is provided with a lifting pump (7), the lifting pump (7) is connected to a membrane filtration tank (11) through a pipeline, and the bottom of the desanding zone (5) is provided with a mud storage tank and a mud discharge pipe.

4. The kitchen wastewater treatment system based on ceramic flat membrane according to claim 3, characterized in that: The inlet and outlet main pipe is connected to the selection tank (13) through a water production device (23), and the inlet and outlet main pipe is connected to the clean water tank (24) through a backwash device. The water production device (23) and the backwash device are connected in parallel and work alternately. An overflow trough is provided on the top of the membrane filtration tank (11), and the overflow trough is connected to the oil storage tank (10) through an oil discharge pipe.

5. The kitchen wastewater treatment system based on ceramic flat membrane according to claim 4, characterized in that: The biochemical treatment unit comprises a denitrification and dephosphorization biochemical pool (14) and a membrane separation pool (15). The denitrification and dephosphorization biochemical pool (14) has an anaerobic zone, an anoxic zone and an aerobic zone in sequence. The membrane separation pool (15) is provided with a second ceramic flat membrane assembly.

6. The kitchen wastewater treatment system based on ceramic flat membrane according to claim 5, characterized in that: The deep treatment unit comprises an ozone activated carbon filter tank, wherein the ozone activated carbon filter tank is provided with an ozone disinfection zone (17), an activated carbon filtration zone (18) and a clean water zone (19) in order from bottom to top, the ozone disinfection zone (17) is connected to a water production device (23) of the second ceramic flat membrane assembly, and the clean water zone (19) is connected to a backwash device of the second ceramic flat membrane assembly.

7. The kitchen wastewater treatment system based on ceramic flat membrane according to claim 6, characterized in that: 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 membrane assembly (12), the bottom of the membrane separation tank (15), the inlet and outlet main pipe of the second ceramic flat membrane assembly and the ozone disinfection area (17) through a plurality of pipelines.

8. The kitchen wastewater treatment system based on ceramic flat membrane according to claim 7, characterized in that: The membrane filtration tank (11), the biochemical treatment tank, the membrane separation tank (15) and the ozone disinfection area (17) are all connected to an aeration device.

9. The kitchen wastewater treatment system based on ceramic flat membrane according to claim 8, characterized in that: The aeration devices share a fan (21).

Images