Microalgae-anaerobic mbr coupling device and method of use thereof

Abstract

A microalgae-anaerobic MBR coupling device and a method for using the same belong to the technical field of water treatment. The present application solves the problem of low resource utilization degree of carbon, nitrogen and phosphorus elements in the existing sewage treatment technology. The main box is provided with a denitrification chamber, an upflow anaerobic sludge bed chamber and a microalgae-anaerobic MBR chamber which are arranged in parallel by two first partition plates. The top of the upflow anaerobic sludge bed chamber is connected with a gas pipeline, and the bottom of the denitrification chamber is connected with a first water inlet pipe. The bottom of the upflow anaerobic sludge bed chamber is connected with a second water inlet pipe. The coupling device can realize efficient resource utilization of carbon, nitrogen and phosphorus elements, and can simultaneously and efficiently remove various pollutants in water, effectively collect resources such as methane and phosphorus-rich chlorella, and has the advantages of high resource utilization degree of carbon, nitrogen and phosphorus elements in sewage, high water purification efficiency, low energy consumption, simple operation, integrated device and the like.

Description

Technical Field

[0001] This invention relates to a microalgae-anaerobic MBR coupling device and its usage method, belonging to the field of water treatment technology. Background Technology

[0002] With the accelerating pace of urbanization in my country, water resources are becoming increasingly scarce. The discharge of nitrogen and phosphorus sources from wastewater into rivers without proper resource utilization leads to eutrophication and frequent algal blooms. Therefore, wastewater resource utilization is of paramount importance. Wastewater treatment technology has undergone a century of development, evolving into numerous processes to meet national discharge or reuse water quality standards, making outstanding contributions to the wastewater resource utilization process.

[0003] Traditional wastewater treatment methods (such as oxidation ditches and sequencing batch reactors) are mostly resource-intensive processes with low resource recovery efficiency. They fail to effectively utilize the carbon, nitrogen, and phosphorus resources in wastewater, resulting in significant energy waste. Furthermore, advanced treatment processes often cannot be integrated due to their complexity, leading to common problems such as land waste and management inconvenience. Therefore, there is an urgent need for an integrated wastewater treatment system that enables resource recovery, multi-functional utilization of wastewater, and other benefits. Summary of the Invention

[0004] The present invention aims to solve the above-mentioned technical problems and provides a microalgae-anaerobic MBR coupling device and its usage method.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0006] Technical Solution 1: A microalgae-anaerobic MBR coupling device, comprising a main tank, a first collection tank, and a second collection tank. The main tank contains a denitrification chamber, an upflow anaerobic sludge bed chamber, and a microalgae-anaerobic MBR chamber, arranged side-by-side by two first partitions. Both the denitrification chamber and the microalgae-anaerobic MBR chamber are top-open structures. The upflow anaerobic sludge bed chamber is a top-closed structure and contains a three-phase separator. A gas pipe is connected to the top of the upflow anaerobic sludge bed chamber. A first inlet pipe is connected to the bottom of the denitrification chamber, and a second inlet pipe is connected to the bottom of the upflow anaerobic sludge bed chamber.

[0007] The microalgae-anaerobic MBR chamber is divided into a microalgae-anaerobic MBR conditioning chamber and a microalgae-anaerobic MBR membrane filter chamber by a second partition. The upflow anaerobic sludge bed chamber and the microalgae-anaerobic MBR conditioning chamber are connected by an overflow pipe, which is positioned higher than the three-phase separator. The microalgae-anaerobic MBR membrane filter chamber contains an MBR. The first water collection tank is connected to the MBR by a first effluent pipe, and the second water collection tank is connected to the denitrification chamber by a second effluent pipe. The bottom of the denitrification chamber, the bottom of the upflow anaerobic sludge bed chamber, the bottom of the microalgae-anaerobic MBR conditioning chamber, and the bottom of the microalgae-anaerobic MBR membrane filter chamber are all provided with perforated sludge discharge pipes. A return pipe is connected between the first effluent pipe and the lower part of the denitrification chamber, and a return pump is installed on the return pipe.

[0008] Technical Solution 2: A microalgae-anaerobic MBR coupling device, comprising a main tank, a first collection tank, and a second collection tank. The main tank contains a denitrification chamber, an upflow anaerobic sludge bed chamber, and a microalgae-anaerobic MBR chamber, arranged side-by-side by two first partitions. Both the denitrification chamber and the microalgae-anaerobic MBR chamber are top-open structures. The upflow anaerobic sludge bed chamber is a top-closed structure and contains a three-phase separator. A gas pipe is connected to the top of the upflow anaerobic sludge bed chamber. A first inlet pipe is connected to the bottom of the denitrification chamber, and a second inlet pipe is connected to the bottom of the upflow anaerobic sludge bed chamber.

[0009] The microalgae-anaerobic MBR chamber is divided into a microalgae-anaerobic MBR algae chamber and a microalgae-anaerobic MBR conditioning chamber by a second and a third partition. The upper part of the microalgae-anaerobic MBR algae chamber is connected to the upper part of the microalgae-anaerobic MBR conditioning chamber. The microalgae-anaerobic MBR algae chamber and the microalgae-anaerobic MBR membrane filter chamber are connected by a connecting pipe. The upflow anaerobic sludge bed chamber and the microalgae-anaerobic MBR conditioning chamber are connected by an overflow pipe, which is positioned higher than the three-phase separator. An MBR is installed in the algae-anaerobic MBR membrane filter chamber. The first water collection tank is connected to the MBR through a first effluent pipe, and the second water collection tank is connected to the denitrification chamber through a second effluent pipe. Perforated sludge discharge pipes are installed at the bottom of the denitrification chamber, the bottom of the upflow anaerobic sludge bed chamber, the bottom of the microalgae-anaerobic MBR regulating chamber, and the bottom of the microalgae-anaerobic MBR algae chamber. A return pipe is connected between the first effluent pipe and the lower part of the denitrification chamber, and a return pump is installed on the return pipe.

[0010] Furthermore, a fourth partition is provided between the second partition and the upflow anaerobic sludge bed chamber, and the fourth partition is staggered vertically from the second partition.

[0011] Furthermore, a water distributor is provided in the middle of the upflow anaerobic sludge bed chamber.

[0012] Furthermore, inclined baffles are arranged at the bottom of the denitrification chamber, the bottom of the upflow anaerobic sludge bed chamber, the bottom of the microalgae-anaerobic MBR regulating chamber, and the bottom of the microalgae-anaerobic MBR membrane filter chamber.

[0013] Furthermore, each outlet pipe is equipped with a liquid flow meter, an air vent valve, and an outlet valve.

[0014] Furthermore, the MBR is an SSMBR, in which ultraviolet lamps and flat film plates are arranged in parallel and alternating rows.

[0015] Furthermore, an aeration device is provided below the MBR.

[0016] Technical Solution 3: A method of using the coupling device described in Technical Solution 1 above, wherein concentrated water is supplied to the denitrification chamber and the upflow anaerobic sludge bed chamber through the first inlet pipe and the second inlet pipe, the concentrated water in the upflow anaerobic sludge bed chamber undergoes solid-liquid-gas separation through a three-phase separator, the sludge is blocked and settled by the three-phase separator and discharged through the perforated sludge discharge pipe, and the separated gas is discharged and collected through a gas pipeline;

[0017] The effluent from the upflow anaerobic sludge bed chamber enters the microalgae-anaerobic MBR equalization chamber through the overflow pipe. The sludge that has not settled sufficiently in the upflow anaerobic sludge bed chamber continues to settle in the microalgae-anaerobic MBR equalization chamber and is discharged through the perforated sludge discharge pipe below it.

[0018] Once a 3cm thick layer of algae has formed on the flat membrane plate in the microalgae-anaerobic MBR membrane filter chamber, turn on the ultraviolet lamp. Set the ultraviolet lamp wavelength to 254nm and the ultraviolet intensity to 1.00mW / cm². 2 The ultraviolet irradiation cycle is 150 seconds of irradiation followed by 10 days of shutdown. The aeration device in the microalgae-anaerobic MBR membrane filter chamber is turned on periodically to backwash the flat membrane plate, and phosphorus-rich flocculent algae precipitate is collected through the perforated sludge discharge pipe below.

[0019] Control the opening and closing degree of the reflux valve to control the ratio of effluent to reflux after membrane filtration.

[0020] Technical Solution 4: A method of using the coupling device described in Technical Solution 2 above, wherein concentrated water is supplied to the denitrification chamber and the upflow anaerobic sludge bed chamber through the first inlet pipe and the second inlet pipe, the concentrated water in the upflow anaerobic sludge bed chamber undergoes solid-liquid-gas separation through a three-phase separator, the sludge is blocked and settled by the three-phase separator and discharged through the perforated sludge discharge pipe, and the separated gas is discharged and collected through a gas pipeline;

[0021] The effluent from the upflow anaerobic sludge bed chamber enters the microalgae-anaerobic MBR equalization chamber through the overflow pipe. The sludge that has not settled sufficiently in the upflow anaerobic sludge bed chamber continues to settle in the microalgae-anaerobic MBR equalization chamber and is discharged through the perforated sludge discharge pipe below it.

[0022] The effluent from the microalgae-anaerobic MBR conditioning chamber enters the microalgae-anaerobic MBR algae chamber. The Chlorella in the microalgae-anaerobic MBR algae chamber absorbs phosphorus-containing compounds in the water through photosynthesis, and the resulting phosphorus-rich algae are discharged through the perforated sludge discharge pipe below.

[0023] Control the opening and closing degree of the reflux valve to control the ratio of effluent to reflux after membrane filtration.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1. In the denitrification chamber, a portion of the concentrated water and the wastewater filtered by the microalgae-anaerobic MBR membrane filter chamber are mixed evenly to provide sufficient carbon source for denitrifying bacteria. No additional organic matter is required, which realizes the resource utilization of carbon source, overcomes the waste of resources in traditional processes, improves the denitrification effect and enhances the removal of nitrates by microorganisms.

[0026] Deep denitrification is achieved through the effluent from the microalgae-anaerobic MBR membrane filter chamber and the return denitrification chamber, realizing the multi-functional utilization of wastewater and the recovery of nitrogen resources;

[0027] Second, it realizes the recovery of carbon sources in sewage. The anaerobic reaction of anaerobic sludge in the upflow anaerobic sludge bed chamber converts carbon source compounds in sewage into renewable resources such as methane, thus realizing the recovery and utilization of carbon sources in sewage.

[0028] Third, it realizes the recovery of phosphorus source in sewage. The microalgae symbiotic system absorbs nitrogen and phosphorus through the rapid growth of microalgae and converts them into biomass for energy production or bio-fertilizer production, realizing carbon source energy production, nitrogen and phosphorus resource recovery and closed-loop utilization.

[0029] Fourth, it realizes the multi-functional use of the effluent. The effluent containing nitrates is stored in the first collection tank and can be used for irrigation in farmland. In the second collection tank, nitrogen compounds are further removed and it can be used in places with higher requirements, such as landscape water use.

[0030] Fifth, it achieves in-depth treatment and resource utilization of carbon, nitrogen and phosphorus elements in wastewater. Traditional process equipment mostly uses independent units connected by pipelines, which occupies a large area and has a complex treatment process. This invention greatly reduces the overall size of the equipment and simplifies the treatment process.

[0031] VI. In the microalgae-anaerobic MBR membrane filter chamber, the microalgae generate oxygen and organic matter through photosynthesis, which enhances the predation and movement of microorganisms in the microalgae-anaerobic MBR membrane filter chamber. The microbial activity feeds back to the microalgae, providing carbon dioxide as a carbon source. The symbiosis of microalgae and bacteria improves the layer properties of the microalgae-anaerobic MBR biofilter cake and increases the membrane flux.

[0032] VII. The coupling device of the present invention can realize the efficient resource utilization of carbon, nitrogen and phosphorus elements in one device. It can simultaneously and efficiently remove multiple pollutants in water while effectively collecting resources such as methane and phosphorus-rich Chlorella. It has the advantages of high resource utilization of carbon, nitrogen and phosphorus elements in wastewater, high water purification efficiency, low energy consumption, simple operation and integrated device. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the microalgae-anaerobic MBR coupling device according to specific implementation method one;

[0034] Figure 2 This is a schematic diagram of the microalgae-anaerobic MBR coupling device according to specific implementation method two. Detailed Implementation

[0035] Specific implementation method one: Combining Figure 1 This embodiment describes a microalgae-anaerobic MBR coupling device, comprising a main tank 1, a first collection tank 2, and a second collection tank 3. The main tank 1 contains a denitrification chamber 5, an upflow anaerobic sludge bed chamber 6, and a microalgae-anaerobic MBR chamber 7, arranged side-by-side by two first partitions 4. Both the denitrification chamber 5 and the microalgae-anaerobic MBR chamber 7 are top-open structures. The upflow anaerobic sludge bed chamber 6 is a top-closed structure and contains a three-phase separator 8. A gas pipe 9 is connected to the top of the upflow anaerobic sludge bed chamber 6. A first inlet pipe 10 is connected to the bottom of the denitrification chamber 5, and a second inlet pipe 11 is connected to the bottom of the upflow anaerobic sludge bed chamber 6.

[0036] The microalgae-anaerobic MBR chamber 7 is divided into a microalgae-anaerobic MBR conditioning chamber 13 and a microalgae-anaerobic MBR membrane filter chamber 14 by a second partition 12. The upflow anaerobic sludge bed chamber 6 is connected to the microalgae-anaerobic MBR conditioning chamber 13 by an overflow pipe 15, which is positioned higher than the three-phase separator 8. An MBR 16 is installed inside the microalgae-anaerobic MBR membrane filter chamber 14. The first water collection tank 2 is connected to the MBR 16 by a second partition 12. A water outlet pipe 17 is connected, and the second water collection tank 3 is connected to the denitrification chamber via a second water outlet pipe 18. The bottom of the denitrification chamber, the bottom of the upflow anaerobic sludge bed chamber 6, the bottom of the microalgae-anaerobic MBR regulating chamber 13, and the bottom of the microalgae-anaerobic MBR membrane filter chamber 14 are all provided with perforated sludge discharge pipes 19. A return pipe 20 is provided between the first water outlet pipe 17 and the lower part of the denitrification chamber 5, and a return pump 21 is provided on the return pipe 20.

[0037] The MBR16 is a membrane bioreactor (MBR).

[0038] The perforated sludge discharge pipe 19 is used to discharge excess sludge from the device in the upflow anaerobic sludge bed chamber 6, the microalgae-anaerobic MBR regulating chamber 13, and the denitrification chamber 5. The perforated sludge discharge pipe 19 in the microalgae-anaerobic MBR membrane filter chamber 14 is used to discharge the flocculent precipitate of Chlorella after backwashing. Each perforated sludge discharge pipe 19 is connected to the external space of the main housing 1 via a vent pipe 22, and a vent valve 23 is installed on the vent pipe 22. The vent pipe 22 and vent valve 23 are used to discharge excess sludge from the perforated sludge discharge pipe 19.

[0039] The three-phase separator 8 is arranged in the middle of the upflow anaerobic sludge bed chamber 6.

[0040] The height of the second baffle 12 is lower than that of the inlet of the overflow pipe 15, ensuring that the water in the upflow anaerobic sludge bed chamber 6 can smoothly enter the microalgae-anaerobic MBR regulating chamber 13.

[0041] The concentrated water is connected to the upflow anaerobic sludge bed chamber 6 and the denitrification chamber 5 through the first inlet pipe 10 and the second inlet pipe 11, respectively.

[0042] A portion of the effluent from the microalgae-anaerobic MBR membrane filter chamber 14 flows into the first water collection tank 2 through the first effluent pipe 17, while the other portion of the effluent flows back to the denitrification chamber 5 through the return pipe 20.

[0043] The reflux pump 21 is powered by a biomass energy power supply device.

[0044] Both the first inlet pipe 10 and the second inlet pipe 11 are connected to the main inlet pipe 24, and a check valve 26 is installed on the main inlet pipe 24. Each inlet pipe is equipped with an inlet valve. The concentrated water in the inlet pipes is the raw water.

[0045] A fourth partition 31 is provided between the second partition 12 and the upflow anaerobic sludge bed chamber 6, and the fourth partition 31 is staggered vertically from the second partition 12. This design, through the staggered arrangement of the second partition 12 and the fourth partition 31, creates a U-shaped channel within the microalgae-anaerobic MBR regulating chamber 13.

[0046] A water distributor 32 is installed in the middle of the upflow anaerobic sludge bed chamber 6. This design ensures uniform water distribution within the upflow anaerobic sludge bed chamber 6.

[0047] Inclined baffles 33 are arranged at the bottom of the denitrification chamber, the bottom of the upflow anaerobic sludge bed chamber 6, the bottom of the microalgae-anaerobic MBR equalization chamber 13, and the bottom of the microalgae-anaerobic MBR membrane filter chamber 14. In this design, the baffles 33 are preferably arranged in a V-shape, with the perforated sludge discharge pipe 19 positioned at the lower end of the baffles 33 to facilitate sludge discharge.

[0048] Each outlet pipe is equipped with a liquid flow meter 34, an air vent valve 35, and an outlet valve 36. This design facilitates monitoring the flow rate of the outlet pipe and enables air venting and water discharge control on the outlet pipe.

[0049] The MBR16 is an SSMBR (Self-Supported Membrane Bioreactor), in which ultraviolet lamps 37 and flat membrane plates 38 are arranged in a staggered, parallel configuration. This design makes the SSMBR a self-sustainable MBR, or a self-supporting membrane bioreactor. It can also be a PMBR (Peripherally Supported Membrane Bioreactor), i.e., a passive MBR. The coupling device of this invention enables the directional cultivation of Chlorella. Microcystis in water produces algal toxins during photosynthesis, posing a threat to water quality, while Chlorella can resist aging. Through the "sandwich" arrangement of ultraviolet lamps 37 and flat membrane plates 38, the ultraviolet lamps 37 and flat membrane plates 38 form a flat membrane plate module, with a 10cm spacing between them. The algae on the flat membrane plate 38 are irradiated by the ultraviolet lamps 37. The ultraviolet lamp 37 is set to a wavelength of 254nm and an ultraviolet intensity of 1.00mW / cm². 2 The ultraviolet irradiation cycle is 150 seconds of irradiation followed by 10 days of shutdown. This achieves a Chlorella to Microcystis community ratio of 99:1, making Chlorella the dominant organism and thus ensuring safer effluent quality.

[0050] An aeration device 39 is installed below the MBR16. This design allows for programmed aeration via the aeration device 39, forming uniform microbubbles that backwash the microalgae flocculent precipitate adsorbed on the ultrafiltration membrane of the MBR16. The aeration device 39 is connected to an air pump 40 via an air supply line, which is equipped with a gas flow meter 41 and an air valve 42. The air pump 40 is powered by a biomass energy supply device.

[0051] Specific Implementation Method Two: Combining Figure 2 This embodiment describes a microalgae-anaerobic MBR coupling device, comprising a main tank 1, a first collection tank 2, and a second collection tank 3. The main tank 1 contains a denitrification chamber 5, an upflow anaerobic sludge bed chamber 6, and a microalgae-anaerobic MBR chamber 7, arranged side-by-side by two first partitions 4. Both the denitrification chamber 5 and the microalgae-anaerobic MBR chamber 7 are top-open structures. The upflow anaerobic sludge bed chamber 6 is a top-closed structure and contains a three-phase separator 8. A gas pipe 9 is connected to the top of the upflow anaerobic sludge bed chamber 6. A first inlet pipe 10 is connected to the bottom of the denitrification chamber 5, and a second inlet pipe 11 is connected to the bottom of the upflow anaerobic sludge bed chamber 6.

[0052] The microalgae-anaerobic MBR chamber 7 is divided into a microalgae-anaerobic MBR chamber 28 and a microalgae-anaerobic MBR conditioning chamber 13 by a second partition 12 and a third partition 27. The upper part of the microalgae-anaerobic MBR chamber 28 is connected to the upper part of the microalgae-anaerobic MBR conditioning chamber 13. The microalgae-anaerobic MBR chamber 28 and the microalgae-anaerobic MBR membrane filter chamber 14 are connected by a connecting pipe 29. The upflow anaerobic sludge bed chamber 6 is connected to the microalgae-anaerobic MBR conditioning chamber 13 by an overflow pipe 15, which is positioned higher than the three-phase separator 8. An MBR 16 is installed inside the anaerobic MBR membrane filter chamber 14. The first water collection tank 2 is connected to the MBR 16 via a first effluent pipe 17. The second water collection tank 3 is connected to the denitrification chamber via a second effluent pipe 18. Perforated sludge discharge pipes 19 are installed at the bottom of the denitrification chamber, the bottom of the upflow anaerobic sludge bed chamber 6, the bottom of the microalgae-anaerobic MBR regulating chamber 13, and the bottom of the microalgae-anaerobic MBR algae chamber 28. A return pipe 20 is connected between the first effluent pipe 17 and the lower part of the denitrification chamber 5. A return pump 21 is installed on the return pipe 20.

[0053] The MBR16 is a membrane bioreactor (MBR).

[0054] The perforated sludge discharge pipe 19 is used to discharge excess sludge from the device in the upflow anaerobic sludge bed chamber 6, the microalgae-anaerobic MBR regulating chamber 13, and the denitrification chamber 5. The perforated sludge discharge pipe 19 in the microalgae-anaerobic MBR algae chamber 28 is used to discharge phosphorus-rich algae. This invention establishes an independent microalgae-anaerobic MBR algae chamber 28, making the cultivation and collection of Chlorella more stable. Each perforated sludge discharge pipe 19 is connected to the external space of the main body 1 via a vent pipe 22, and a vent valve 23 is installed on the vent pipe 22. The vent pipe 22 and vent valve 23 are used to discharge excess sludge from the perforated sludge discharge pipe 19.

[0055] The three-phase separator 8 is arranged in the middle of the upflow anaerobic sludge bed chamber 6.

[0056] The height of the second baffle 12 is lower than that of the inlet of the overflow pipe 15, ensuring that the water in the upflow anaerobic sludge bed chamber 6 can smoothly enter the microalgae-anaerobic MBR regulating chamber 13.

[0057] The concentrated water is connected to the upflow anaerobic sludge bed chamber 6 and the denitrification chamber 5 through the first inlet pipe 10 and the second inlet pipe 11, respectively.

[0058] A portion of the effluent from the microalgae-anaerobic MBR membrane filter chamber 14 flows into the first water collection tank 2 through the first effluent pipe 17, while the other portion of the effluent flows back to the denitrification chamber 5 through the return pipe 20.

[0059] The reflux pump 21 is powered by a biomass energy power supply device.

[0060] The connecting pipe 29 is connected to the upper part of the microalgae-anaerobic MBR algae chamber 28. A connecting valve 30 is provided on the connecting pipe 29.

[0061] The first inlet pipe 10 and the second inlet pipe 11 are both connected to the main inlet pipe 24, and a check valve 26 is installed on the main inlet pipe 24. Each inlet pipe is equipped with an inlet valve. The concentrated water in the inlet pipe is the raw water.

[0062] The elimination of the ultraviolet lamp 37 and the aeration device 39 for backwashing significantly reduces operating and maintenance costs.

[0063] The flat sheet membrane 38 in MBR16 can be replaced with a hollow fiber membrane.

[0064] Through the reaction of different microorganisms with organic matter in the upflow anaerobic sludge bed chamber 6, the organic matter is converted into renewable resources such as biogas, thereby realizing the recovery of carbon source resources.

[0065] A fourth partition 31 is provided between the second partition 12 and the upflow anaerobic sludge bed chamber 6, and the fourth partition 31 is staggered vertically from the second partition 12. This design, through the staggered arrangement of the second partition 12 and the fourth partition 31, creates a U-shaped channel within the microalgae-anaerobic MBR regulating chamber 13.

[0066] A water distributor 32 is installed in the middle of the upflow anaerobic sludge bed chamber 6. This design ensures uniform water distribution within the upflow anaerobic sludge bed chamber 6.

[0067] Inclined baffles 33 are arranged at the bottom of the denitrification chamber, the bottom of the upflow anaerobic sludge bed chamber 6, the bottom of the microalgae-anaerobic MBR equalization chamber 13, and the bottom of the microalgae-anaerobic MBR membrane filter chamber 14. In this design, the baffles 33 are preferably arranged in a V-shape, with the perforated sludge discharge pipe 19 positioned at the lower end of the baffles 33 to facilitate sludge discharge.

[0068] Each outlet pipe is equipped with a liquid flow meter 34, an air vent valve 35, and an outlet valve 36. This design facilitates monitoring the flow rate of the outlet pipe and enables air venting and water discharge control on the outlet pipe.

[0069] Other components and connections are the same as in Specific Implementation Method 1.

[0070] Specific implementation method three: Combining Figure 1 This embodiment describes a method of using the coupling device described in the first specific embodiment above. Concentrated water is supplied to the denitrification chamber 5 and the upflow anaerobic sludge bed chamber 6 through the first inlet pipe 10 and the second inlet pipe 11. The concentrated water in the upflow anaerobic sludge bed chamber 6 undergoes solid-liquid-gas separation via a three-phase separator 8. Sludge is blocked and settled by the three-phase separator 8 and discharged through the perforated sludge discharge pipe 19. The separated gas is discharged and collected through a gas pipeline 9. Depending on the quality of the concentrated water, during the wastewater treatment process, the BOD5 / TN ratio in the denitrification chamber 5 can be monitored using a real-time wastewater treatment monitoring device. If the ratio is greater than 5, the opening degree of the inlet valve is slightly adjusted to be smaller; if it is less than 3, the opening degree of the inlet valve is slightly adjusted to be larger. The separated gas is a gaseous resource such as methane.

[0071] The effluent from the upflow anaerobic sludge bed chamber 6 enters the microalgae-anaerobic MBR regulating chamber 13 through the overflow pipe 15. The sludge that has not settled sufficiently in the upflow anaerobic sludge bed chamber 6 continues to settle in the microalgae-anaerobic MBR regulating chamber 13 and is discharged through the perforated sludge discharge pipe 19 below it.

[0072] When a 3cm thick layer of algae has formed on the flat membrane plate 38 in the microalgae-anaerobic MBR membrane filter chamber 14, turn on the ultraviolet lamp 37. The wavelength of the ultraviolet lamp 37 is set to 254nm, and the ultraviolet intensity is set to 1.00mW / cm. 2The ultraviolet irradiation cycle is 150 seconds of irradiation followed by 10 days of shutdown. The aeration device 39 in the microalgae-anaerobic MBR membrane filter chamber 14 is periodically turned on to backwash the flat membrane plate 38, and phosphorus-rich flocculent algae are collected through the perforated sludge discharge pipe 19 below. The opening cycle of the aeration device 39 depends on the actual situation and can be one week, two weeks or one month.

[0073] The opening and closing degree of the reflux valve is controlled to regulate the ratio of effluent to reflux after membrane filtration. The water in the first collection tank 2 has had most organic pollutants and phosphorus compounds removed, and contains a certain amount of nitrates, which can be used for field irrigation, landscaping, and other purposes. The reflux water and the concentrated water in the first inlet pipe 10 enter the denitrification chamber 5 to achieve the denitrification effect of the mixed liquor. The effluent from the denitrification chamber 5 enters the second collection tank 3, which can be used for applications with higher water quality requirements.

[0074] Specific implementation method four: Combination Figure 2 This embodiment describes a method of using the coupling device described in the second specific embodiment above. Concentrated water is supplied to the denitrification chamber 5 and the upflow anaerobic sludge bed chamber 6 through the first inlet pipe 10 and the second inlet pipe 11. The concentrated water in the upflow anaerobic sludge bed chamber 6 undergoes solid-liquid-gas separation via a three-phase separator 8. Sludge is blocked and settled by the three-phase separator 8 and discharged through the perforated sludge discharge pipe 19. The separated gas is discharged and collected through a gas pipeline 9. Depending on the quality of the concentrated water, the BOD5 / TN ratio in the denitrification chamber 5 can be monitored using a real-time wastewater treatment monitoring device. If the ratio is greater than 5, the opening degree of the inlet valve is slightly adjusted to be smaller; if it is less than 3, the opening degree of the inlet valve is slightly adjusted to be larger. The separated gas is methane or other gaseous resources.

[0075] The effluent from the upflow anaerobic sludge bed chamber 6 enters the microalgae-anaerobic MBR regulating chamber 13 through the overflow pipe 15. The sludge that has not settled sufficiently in the upflow anaerobic sludge bed chamber 6 continues to settle in the microalgae-anaerobic MBR regulating chamber 13 and is discharged through the perforated sludge discharge pipe 19 below it.

[0076] The effluent from the microalgae-anaerobic MBR regulating chamber 13 enters the microalgae-anaerobic MBR algae chamber 28. The Chlorella in the microalgae-anaerobic MBR algae chamber 28 absorbs phosphorus-containing compounds in the water through photosynthesis, and the resulting phosphorus-rich algae are discharged through the perforated sludge discharge pipe 19 below it.

[0077] The opening and closing degree of the reflux valve is controlled to regulate the ratio of effluent to reflux after membrane filtration. The water in the first collection tank 2 has had most organic pollutants and phosphorus compounds removed, and contains a certain amount of nitrates, which can be used for field irrigation, landscaping, and other purposes. The reflux water and the concentrated water in the first inlet pipe 10 enter the denitrification chamber 5 to achieve the denitrification effect of the mixed liquor. The effluent from the denitrification chamber 5 enters the second collection tank 3, which can be used for applications with higher water quality requirements.

Claims

1. A method of using a microalgae-anaerobic MBR coupling device, characterized in that: The microalgae-anaerobic MBR coupling device includes a main tank (1), a first water collection tank (2) and a second water collection tank (3). The main tank (1) is separated by two first partitions (4) and has a denitrification chamber (5), an upflow anaerobic sludge bed chamber (6) and a microalgae-anaerobic MBR chamber (7). The denitrification chamber (5) and the microalgae-anaerobic MBR chamber (7) are both open-top structures. The upflow anaerobic sludge bed chamber (6) is a closed-top structure and has a three-phase separator (8) installed inside. The top of the upflow anaerobic sludge bed chamber (6) is connected to a gas pipe (9). The bottom of the denitrification chamber (5) is connected to a first inlet pipe (10), and the bottom of the upflow anaerobic sludge bed chamber (6) is connected to a second inlet pipe (11). The microalgae-anaerobic MBR chamber (7) is separated by a second partition (12) into a microalgae-anaerobic MBR conditioning chamber (13) and a microalgae-anaerobic MBR membrane filter chamber (14). The upflow anaerobic sludge bed chamber (6) and the microalgae-anaerobic MBR conditioning chamber (13) are connected by an overflow pipe (15), which is positioned higher than the three-phase separator (8). An MBR (16) is installed in the microalgae-anaerobic MBR membrane filter chamber (14). The first water collection tank (2) and the MBR (16) are connected by a first effluent outlet. The second water collection tank (3) is connected to the denitrification chamber (5) via the second effluent pipe (18). The bottom of the denitrification chamber (5), the bottom of the upflow anaerobic sludge bed chamber (6), the bottom of the microalgae-anaerobic MBR regulating chamber (13), and the bottom of the microalgae-anaerobic MBR membrane filter chamber (14) are all provided with perforated sludge discharge pipes (19). A return pipe (20) is connected between the first effluent pipe (17) and the lower part of the denitrification chamber (5). A return pump (21) is provided on the return pipe (20). The method of use includes: supplying concentrated water to the denitrification chamber (5) and the upflow anaerobic sludge bed chamber (6) through the first inlet pipe (10) and the second inlet pipe (11). The concentrated water in the upflow anaerobic sludge bed chamber (6) is separated into solid, liquid and gas by a three-phase separator (8). The sludge is blocked and settled by the three-phase separator (8) and discharged through the perforated sludge discharge pipe (19). The separated gas is discharged and collected through the gas pipeline (9). The effluent from the upflow anaerobic sludge bed chamber (6) enters the microalgae-anaerobic MBR regulating chamber (13) through the overflow pipe (15). The sludge that has not settled sufficiently in the upflow anaerobic sludge bed chamber (6) continues to settle in the microalgae-anaerobic MBR regulating chamber (13) and is discharged through the perforated sludge discharge pipe (19) below it. When a 3 cm thick layer of algae has formed on the flat membrane plate (38) in the microalgae-anaerobic MBR membrane filter chamber (14), turn on the ultraviolet lamp (37). The ultraviolet lamp (37) is set to a wavelength of 254 nm and an ultraviolet intensity of 1.00 mW / cm. 2 The ultraviolet irradiation cycle is 150 seconds of irradiation followed by 10 days of irradiation. The aeration device (39) in the microalgae-anaerobic MBR membrane filter chamber (14) is turned on periodically to backwash the flat membrane plate (38) and collect phosphorus-rich flocculent algae precipitate through the perforated sludge discharge pipe (19) below. Control the opening and closing degree of the reflux valve to control the ratio of effluent to reflux after membrane filtration.

2. A method of using a microalgae-anaerobic MBR coupling device, characterized in that: The microalgae-anaerobic MBR coupling device includes a main tank (1), a first water collection tank (2) and a second water collection tank (3). The main tank (1) is separated by two first partitions (4) and has a denitrification chamber (5), an upflow anaerobic sludge bed chamber (6) and a microalgae-anaerobic MBR chamber (7). The denitrification chamber (5) and the microalgae-anaerobic MBR chamber (7) are both open-top structures. The upflow anaerobic sludge bed chamber (6) is a closed-top structure and has a three-phase separator (8) installed inside. The top of the upflow anaerobic sludge bed chamber (6) is connected to a gas pipe (9). The bottom of the denitrification chamber (5) is connected to a first inlet pipe (10), and the bottom of the upflow anaerobic sludge bed chamber (6) is connected to a second inlet pipe (11). The microalgae-anaerobic MBR chamber (7) is divided into a microalgae-anaerobic MBR algae chamber (28) and a microalgae-anaerobic MBR regulating chamber (13) by a second partition (12) and a third partition (27). The upper part of the microalgae-anaerobic MBR algae chamber (28) is connected to the upper part of the microalgae-anaerobic MBR regulating chamber (13). The microalgae-anaerobic MBR algae chamber (28) and the microalgae-anaerobic MBR membrane filter chamber (14) are connected by a connecting pipe (29). The upflow anaerobic sludge bed chamber (6) and the microalgae-anaerobic MBR regulating chamber (13) are connected by an overflow pipe (15), and the overflow pipe (15) is set higher than the three-phase separator (8). An MBR (16) is installed inside the BR membrane filter chamber (14). The first water collection tank (2) is connected to the MBR (16) through the first water outlet pipe (17). The second water collection tank (3) is connected to the denitrification chamber (5) through the second water outlet pipe (18). The bottom of the denitrification chamber (5), the bottom of the upflow anaerobic sludge bed chamber (6), the bottom of the microalgae-anaerobic MBR regulating chamber (13), and the bottom of the microalgae-anaerobic MBR algae chamber (28) are all provided with perforated sludge discharge pipes (19). A return pipe (20) is connected between the first water outlet pipe (17) and the lower part of the denitrification chamber (5). A return pump (21) is installed on the return pipe (20). The method of use includes: supplying concentrated water to the denitrification chamber (5) and the upflow anaerobic sludge bed chamber (6) through the first inlet pipe (10) and the second inlet pipe (11). The concentrated water in the upflow anaerobic sludge bed chamber (6) is separated into solid, liquid and gas by a three-phase separator (8). The sludge is blocked and settled by the three-phase separator (8) and discharged through the perforated sludge discharge pipe (19). The separated gas is discharged and collected through the gas pipeline (9). The effluent from the upflow anaerobic sludge bed chamber (6) enters the microalgae-anaerobic MBR regulating chamber (13) through the overflow pipe (15). The sludge that has not settled sufficiently in the upflow anaerobic sludge bed chamber (6) continues to settle in the microalgae-anaerobic MBR regulating chamber (13) and is discharged through the perforated sludge discharge pipe (19) below it. The effluent from the microalgae-anaerobic MBR regulating chamber (13) enters the microalgae-anaerobic MBR algae chamber (28). The Chlorella in the microalgae-anaerobic MBR algae chamber (28) absorbs phosphorus-containing compounds in the water through photosynthesis, and the phosphorus-rich algae formed are discharged through the perforated mud discharge pipe (19) below it. Control the opening and closing degree of the reflux valve to control the ratio of effluent to reflux after membrane filtration.

3. The method of using a microalgae-anaerobic MBR coupling device according to claim 1 or 2, characterized in that: A fourth partition (31) is provided between the second partition (12) and the upflow anaerobic sludge bed chamber (6), and the fourth partition (31) and the second partition (12) are arranged vertically and vertically offset.

4. The method of using a microalgae-anaerobic MBR coupling device according to claim 1 or 2, characterized in that: A water distributor (32) is provided in the middle of the upflow anaerobic sludge bed chamber (6).

5. The method of using a microalgae-anaerobic MBR coupling device according to claim 1 or 2, characterized in that: Inclined baffles (33) are arranged at the bottom of the denitrification chamber (5), the bottom of the upflow anaerobic sludge bed chamber (6), the bottom of the microalgae-anaerobic MBR conditioning chamber (13), and the bottom of the microalgae-anaerobic MBR membrane filter chamber (14).

6. The method of using a microalgae-anaerobic MBR coupling device according to claim 1 or 2, characterized in that: Each outlet pipe is equipped with a liquid flow meter (34), an air vent valve (35), and an outlet valve (36).

7. The method of using the microalgae-anaerobic MBR coupling device according to claim 1, characterized in that: The MBR (16) is an SSMBR, in which ultraviolet lamps (37) and flat membrane plates (38) are arranged in a staggered manner.

8. The method of using the microalgae-anaerobic MBR coupling device according to claim 7, characterized in that: An aeration device (39) is provided below the MBR (16).

Images