Reactor, cultivation system and cultivation method for anaerobic ammonium oxidation granular sludge

Abstract

The embodiment of the present application provides a reactor, a cultivation system and a cultivation method for anaerobic ammonium oxidation granular sludge. The reactor is provided with a first reflux cylinder so that a part of the inner cavity of the shell forms a first circulation zone. During the first circulation process, the mixture alternately circulates and rises in the first circulation rising zone and refluxes and descends in the first circulation descending zone. Thereby, it can enable the anaerobic ammonium oxidation sludge and the culture medium in the mixture to fully contact, improve the mass transfer efficiency and the buffering performance of the reactor, and further improve the growth rate of the anaerobic ammonium oxidation granular sludge. By setting a three-phase separator, another part of the inner cavity of the shell forms a second circulation zone. During the second circulation process, the mixture alternately circulates and rises in the second circulation rising zone and refluxes and descends in the second circulation descending zone. While promoting the complete mixing and contact of the anaerobic ammonium oxidation sludge and the culture medium, the solid-liquid-gas three-phase separation is realized, and the anaerobic ammonium oxidation granular sludge is effectively intercepted, thereby improving the growth rate of the anaerobic ammonium oxidation granular sludge.

Description

Technical Field

[0001] This application relates to the technical field of sewage treatment. Specifically, this application relates to a reactor, a cultivation system, and a cultivation method for anaerobic ammonium oxidation granular sludge. Background Art

[0002] With the rapid development of the global economy and technology, major industries such as food, aquaculture, catering, and pharmaceuticals have developed rapidly. These industries generate a large amount of ammonia-nitrogen-rich wastewater, which is discharged into water bodies, leading to serious eutrophication and endangering human health. Anaerobic ammonium oxidation is a relatively efficient and energy-saving nitrogen removal method to date, which can achieve autotrophic high-load nitrogen removal and has the advantages of not adding carbon sources and low sludge production. Among them, anaerobic ammonium oxidation granular sludge has attracted much attention due to its good activity and strong shock load resistance.

[0003] However, the current growth rate of anaerobic ammonium oxidation granular sludge is slow, resulting in the lag in the development of anaerobic ammonium oxidation processes in engineering applications. Summary of the Invention

[0004] In view of the shortcomings of the existing methods, this application proposes a reactor, a cultivation system, and a cultivation method for anaerobic ammonium oxidation granular sludge to solve the technical problem of the slow growth rate of existing anaerobic ammonium oxidation granular sludge.

[0005] In a first aspect, an embodiment of this application provides a reactor for anaerobic ammonium oxidation granular sludge, including:

[0006] A housing with an inlet and an outlet at both ends;

[0007] A first reflux cylinder disposed within the housing, such that a part of the inner cavity of the housing forms a first circulation zone, the first circulation zone including a first circulation descending zone within the first reflux cylinder and a first circulation ascending zone between the first reflux cylinder and the housing; one end of the first reflux cylinder communicates with the inlet of the housing;

[0008] A three-phase separator disposed between the other end of the first reflux cylinder within the housing and the outlet of the housing and all communicating therewith, such that another part of the inner cavity of the housing forms a second circulation zone, the second circulation zone including a second circulation ascending zone within the three-phase separator and a second circulation descending zone between the three-phase separator and the housing.

[0009] Optionally, the reactor further includes an aeration device disposed in the first circulation ascending zone.

[0010] Optionally, the reactor further includes at least one of the following:

[0011] The three-phase separator includes a first part close to the first reflux cylinder and a second part far from the first reflux cylinder, and the diameter of the first part is larger than that of the second part;

[0012] The reactor further includes a second reflux cylinder disposed in the shell. One end of the second reflux cylinder close to the three-phase separator communicates with the second part of the three-phase separator, and the other end communicates with the air outlet of the shell; the inner diameter of the second reflux cylinder is larger than the outer diameter of the second part of the three-phase separator;

[0013] The outer diameter of the first reflux cylinder is smaller than the inner diameter of the first part of the three-phase separator; an opening communicating the first circulation rising area and the first circulation falling area is provided at one end of the first reflux cylinder close to the water inlet;

[0014] The reactor further includes a baffle plate, and the baffle plate is disposed on the peripheral wall of the shell close to the first reflux cylinder between the three-phase separator and the first reflux cylinder; there is a gap between the baffle plate and the first part of the three-phase separator.

[0015] In a second aspect, an anaerobic ammonium oxidation granular sludge cultivation system provided by an embodiment of the present application includes: a detection device and the reactor described in the first aspect, and the detection device detects the dissolved oxygen concentration, temperature, and pH value in the first circulation rising area of the reactor.

[0016] In a third aspect, an anaerobic ammonium oxidation granular sludge cultivation method provided by an embodiment of the present application includes:

[0017] Adding nitrifying sludge and a culture medium into the reactor, aerating in the first circulation rising area between the first reflux cylinder and the shell of the reactor, and detecting the dissolved oxygen concentration of the reactor until the dissolved oxygen concentration is stabilized within a first designed concentration;

[0018] When the dissolved oxygen concentration is stabilized within the first designed concentration, adding anaerobic ammonium oxidation sludge into the reactor to obtain a first mixture, and performing a first circulation and a second circulation on the first mixture based on the air-lift effect. The first circulation includes ascending in the first circulation rising area and descending in the first circulation falling area alternately in a cycle, and the second circulation includes ascending in the second circulation rising area and descending in the second circulation falling area alternately in a cycle.

[0019] Optionally, the cultivation method includes at least one of the following:

[0020] The concentration of the nitrifying sludge is not less than 500 mg / L and not more than 3000 mg / L;

[0021] The anaerobic ammonium oxidation sludge includes at least one of anaerobic ammonium oxidation granular sludge and anaerobic ammonium oxidation flocculent sludge; the concentration of the anaerobic ammonium oxidation sludge is not less than 50 mg / L;

[0022] The first designed concentration is not greater than 0.5 mg / L.

[0023] Optionally, the culture medium includes high-ammonia-nitrogen wastewater and sodium nitrite, the preset concentration ratio of the influent ammonia nitrogen in the high-ammonia-nitrogen wastewater to the influent nitrite nitrogen in the sodium nitrite is 1:1 to 2:1, and the concentration of the influent nitrite nitrogen does not exceed 80 mg / L.

[0024] Optionally, based on the air-lift effect, the first circulation and the second circulation of the first mixture include:

[0025] Perform three-phase separation on the first mixture to obtain a first gaseous substance, a first solid substance, and a first liquid substance respectively, and output the first liquid substance;

[0026] Detect the concentrations of the effluent ammonia nitrogen and the effluent nitrite nitrogen in the first liquid substance. If the concentration of the effluent nitrite nitrogen is higher than 20 mg / L, extend the hydraulic retention time of the reactor; if the concentration of the effluent nitrite nitrogen is lower than the first threshold, shorten the hydraulic retention time of the reactor or increase the concentrations of the influent ammonia nitrogen and the influent nitrite nitrogen according to the preset concentration ratio.

[0027] Optionally, the step of shortening the hydraulic retention time or increasing the concentrations of the influent ammonia nitrogen and the influent nitrite nitrogen according to the preset concentration ratio when the concentration of the effluent nitrite nitrogen is lower than the first threshold includes:

[0028] When the concentration of the effluent nitrite nitrogen is lower than 5 mg / L, the hydraulic retention time is shortened by 1 hour; or,

[0029] The concentration of the influent nitrite nitrogen is increased by 20 mg / L, and at the same time, the concentration of the influent ammonia nitrogen is increased according to the preset concentration ratio of the influent ammonia nitrogen to the influent nitrite nitrogen of 1:1 to 2:1.

[0030] Optionally, the high-ammonia-nitrogen wastewater includes at least one of the anaerobic effluent, biogas slurry, and aged landfill leachate of food waste water, food processing wastewater, or aquaculture wastewater.

[0031] The beneficial technical effects brought by the technical solution provided by the embodiments of the present application include:

[0032] By setting up the first reflux cylinder, a first circulation zone is formed in a part of the inner cavity of the shell. The mixture in the reactor rises from the first circulation rising zone, and part of the mixture refluxes and descends to the bottom of the shell due to gravity, mixing with the mixture at the bottom. During the first circulation process, the mixture alternately circulates, rising in the first circulation rising zone and refluxing and descending in the first circulation descending zone. Thereby, the anaerobic ammonium oxidation sludge and the culture medium in the mixture can be fully contacted, so as to improve the mass transfer efficiency, and further improve the growth rate of anaerobic ammonium oxidation granular sludge. At the same time, the first circulation mixing can accelerate the dilution of the influent water, making the reaction system have a good buffering capacity; and by setting up the three-phase separator, another part of the inner cavity of the shell forms a second circulation zone. During the second circulation process, the mixture alternately circulates, rising in the second circulation rising zone and refluxing and descending in the second circulation descending zone, and refluxes and descends to the bottom of the shell through the first circulation descending zone. While further promoting the complete mixing and contact of the anaerobic ammonium oxidation sludge and the culture medium, solid-liquid-gas three-phase separation is realized, and the anaerobic ammonium oxidation granular sludge is effectively intercepted, improving the growth rate of the anaerobic ammonium oxidation granular sludge. And during the second circulation process, the anaerobic ammonium oxidation sludge refluxes to the bottom of the shell, ensuring that the anaerobic ammonium oxidation sludge does not flow out with the effluent and is retained in the reactor to achieve continuous proliferation; in addition, by adopting the method of gradually increasing the concentration of the culture medium, it can ensure that the supply of the culture medium available for the anaerobic ammonium oxidation sludge in the reactor is sufficient, and at the same time, the concentration of the culture medium is not too high to affect the activity of the anaerobic ammonium oxidation sludge, so that the anaerobic ammonium oxidation sludge is in a state of high-speed proliferation.

[0033] Additional aspects and advantages of the present application will be given in part in the following description, and these will become obvious from the following description or be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above-mentioned and / or additional aspects and advantages of the present application will become obvious and easy to understand from the following description of the embodiments in conjunction with the drawings, in which:

[0035] Figure 1 is a schematic cross-sectional structure diagram of a reactor for anaerobic ammonium oxidation granular sludge provided by an embodiment of the present application;

[0036] Figure 2 is a schematic diagram of a culture system for anaerobic ammonium oxidation granular sludge provided by an embodiment of the present application;

[0037] Figure 3 is a schematic flow chart of a method for culturing anaerobic ammonium oxidation granular sludge provided by an embodiment of the present application.

[0038] Reference numerals:

[0039] 1 - Reactor;

[0040] 11 - Housing; 111 - Water inlet; 112 - Gas outlet;

[0041] 12 - First reflux cylinder; 121 - Opening;

[0042] 13 - First circulation zone; 131 - First circulation rising zone; 132 - First circulation descending zone;

[0043] 14 - Three - phase separator; 141 - First part; 142 - Second part;

[0044] 15 - Second circulation zone; 151 - Second circulation rising zone; 152 - Second circulation descending zone;

[0045] 16 - Aeration device;

[0046] 17 - Second reflux cylinder;

[0047] 18 - Baffle;

[0048] 191 - Overflow weir; 192 - Water outlet; 193 - Sampling port;

[0049] 2 - Cultivation system;

[0050] 21 - Detection device; 211 - Dissolved oxygen concentration probe; 212 - pH probe; 213 - Temperature probe;

[0051] 22 - Inlet water storage tank;

[0052] 23 - Nitrifying sludge storage tank;

[0053] 24 - Anaerobic ammonium oxidation sludge storage tank;

[0054] 25 - Alkali storage tank;

[0055] 26 - Detection terminal;

[0056] 27 - Constant temperature water tank. Specific implementation manners

[0057] The embodiments of the present application will be described below with reference to the accompanying drawings in the present application. It should be understood that the embodiments described below in conjunction with the accompanying drawings are exemplary descriptions for explaining the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions of the embodiments of the present application.

[0058] Those skilled in the art can understand that, unless specifically stated otherwise, the singular forms "a", "an", "the" and "said" used herein may also include the plural forms. It should be further understood that the term "including" used in the specification of this application means the presence of the described features, integers, steps, operations, elements and / or components, but does not exclude the implementation of other features, information, data, steps, operations, elements, components and / or their combinations supported by the technical field of the present invention. The term "and / or" used herein refers to at least one of the items defined by the term. For example, "A and / or B" can be implemented as "A", or as "B", or as "A and B".

[0059] To make the objectives, technical solutions and advantages of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the accompanying drawings.

[0060] The research and development idea of the present application includes: Currently, the growth rate of anaerobic ammonium oxidation granular sludge is slow, resulting in the lag in the development of the anaerobic ammonium oxidation process in engineering applications. Therefore, how to improve the growth rate of anaerobic ammonium oxidation granular sludge and achieve the effective enrichment of anaerobic ammonium oxidation granular sludge has become a key issue for the successful start-up, stable operation and popularization of the anaerobic ammonium oxidation process.

[0061] The following will specifically describe the technical solutions of the present application and how the technical solutions of the present application solve the above technical problems with specific embodiments. It should be noted that the following embodiments can be referenced, borrowed or combined with each other. For the same terms, similar features and similar implementation steps in different embodiments, they will not be described repeatedly.

[0062] The embodiment of the present application provides a reactor 1 for anaerobic ammonium oxidation granular sludge. The structural schematic diagram of the reactor 1 is as Figure 1 shown, including: a housing 11, a first return cylinder 12 and a three-phase separator 14.

[0063] An inlet 111 and an outlet 112 are respectively arranged at both ends of the housing 11.

[0064] The first return cylinder 12 is arranged in the housing 11, so that a part of the inner cavity of the housing 11 forms a first circulation zone 13. The first circulation zone 13 includes a first circulation descending zone 132 located in the first return cylinder 12 and a first circulation ascending zone 131 located between the first return cylinder 12 and the housing 11. One end of the first return cylinder 12 communicates with the inlet 111 of the housing 11.

[0065] The three-phase separator 14 is disposed between the other end of the first reflux cylinder 12 within the housing 11 and the gas outlet 112 of the housing 11, and they are all in communication, such that another part of the inner cavity of the housing 11 forms a second circulation zone 15. The second circulation zone 15 includes a second circulation rising zone 151 within the three-phase separator 14 and a second circulation descending zone 152 between the three-phase separator 14 and the housing 11.

[0066] In this embodiment, by providing the first reflux cylinder 12, a part of the inner cavity of the housing 11 forms a first circulation zone 13. The mixture in the reactor 1 rises from the first circulation rising zone 131, and part of the mixture refluxes and descends to the bottom of the housing 11 due to gravity, mixing with the mixture at the bottom. During the first circulation process, the mixture alternately circulates, rising in the first circulation rising zone 131 and refluxing and descending in the first circulation descending zone 132. Thereby, the anaerobic ammonium oxidation sludge and the culture medium in the mixture can be fully contacted, so as to improve the mass transfer efficiency, and further improve the growth rate of anaerobic ammonium oxidation granular sludge. At the same time, the first circulation mixing can accelerate the dilution of the influent, making the reaction system have a better buffering capacity; and by providing the three-phase separator 14, another part of the inner cavity of the housing 11 forms a second circulation zone 15. During the second circulation process, the mixture alternately circulates, rising in the second circulation rising zone 151 and refluxing and descending in the second circulation descending zone 152, and refluxes and descends to the bottom of the housing 11 through the first circulation descending zone 132. While further promoting the complete mixing and contact of the anaerobic ammonium oxidation sludge and the culture medium, solid-liquid-gas three-phase separation is achieved, and the anaerobic ammonium oxidation granular sludge is effectively intercepted, improving the growth rate of the anaerobic ammonium oxidation granular sludge. And during the second circulation process, the anaerobic ammonium oxidation sludge refluxes to the bottom of the housing 11, ensuring that the anaerobic ammonium oxidation sludge does not flow out with the effluent and remains in the reactor 1 to achieve continuous proliferation; in addition, by adopting the method of gradually increasing the concentration of the culture medium, it can be ensured that the supply of the culture medium available for the anaerobic ammonium oxidation sludge in the reactor 1 is sufficient, and at the same time, the concentration of the culture medium is not too high to affect the activity of the anaerobic ammonium oxidation sludge, so that the anaerobic ammonium oxidation sludge is in a state of high-speed proliferation.

[0067] Therefore, by providing the reactor 1 with a double circulation, the mixture in the reactor 1 can be in a fully mixed state, enabling the anaerobic ammonium oxidation sludge and the culture medium to be fully contacted, thereby accelerating mass transfer, promoting the growth of anaerobic ammonium oxidation granular sludge. At the same time, no substance is provided in the first circulation rising zone 131 to facilitate increasing the reaction space of the reaction zone, which can be conducive to improving the growth rate of anaerobic ammonium oxidation granular sludge and reducing costs.

[0068] Optionally, the reactor 1 further includes an aeration device 16, and the aeration device 16 is disposed in the first circulation rising zone 131.

[0069] In this embodiment, by arranging an aeration device 16 in the first circulating upward zone 131, the aeration device 16 introduces air into the first circulating upward zone 131. Under the air-lift effect, the mixture can perform the first circulation and the second circulation, and the formation of granular anaerobic ammonium oxidation sludge is facilitated by the scouring of the air-lift effect.

[0070] Optionally, the aeration device 16 can be arranged at the bottom of the housing 11. During the aeration process, the mixture at the bottom of the housing 11 can be fully mixed, preventing the mixture from depositing, which is beneficial to achieving sufficient contact between the anaerobic ammonium oxidation sludge and the culture medium in the mixture, and thus promoting the growth of anaerobic ammonium oxidation granular sludge.

[0071] It should be noted that during the aeration process of the aeration device 16, increasing the dissolved oxygen content is likely to affect the activity of the anaerobic ammonium oxidation sludge. In this application, nitrifying sludge is added to control the dissolved oxygen concentration in the first circulating upward zone 131, so as to maintain the oxygen-limited environment in the reactor 1 and the dissolved oxygen suitable for the anaerobic ammonium oxidation sludge, and ensure the activity of the anaerobic ammonium oxidation sludge.

[0072] Optionally, the aeration device 16 can include at least one of a perforated pipe aeration device, a microporous aeration device, or a jet aeration device.

[0073] Optionally, the three-phase separator 14 includes a first part 141 close to the first return cylinder 12 and a second part 142 far from the first return cylinder 12, and the diameter of the first part 141 is larger than that of the second part 142.

[0074] In this embodiment, the first part 141 of the three-phase separator 14 communicates with one end of the first return cylinder 12 close to the first part 141, and the second part 142 communicates with the air outlet 112 of the housing 11. The three-phase separator 14 can achieve the separation of gas, water, and sludge. The gas is output from the second part 142 of the three-phase separator 14 and then output to the external environment from the air outlet 112 communicated with the second part 142, which can reduce the influence of the gas on the sludge reflux.

[0075] Optionally, the reactor 1 further includes a second return cylinder 17 arranged in the housing 11. One end of the second return cylinder 17 close to the three-phase separator 14 communicates with the second part 142 of the three-phase separator 14, and the other end communicates with the air outlet 112 of the housing 11; the inner diameter of the second return cylinder 17 is larger than the outer diameter of the second part 142 of the three-phase separator 14.

[0076] In this embodiment, by providing the second return cylinder 17, a return channel is formed in the second circulation descending zone 152 between the second return cylinder 17 and the three-phase separator 14. Due to its own gravity, part of the mixture rising in the second circulation ascending zone 151 inside the three-phase separator 14 flows downward through the return channel, flows out of the return channel, and enters the solid-liquid separation zone, that is, the area between the second return cylinder 17 and the housing 11. The anaerobic ammonium oxidation granular sludge in the mixture returns to the bottom of the housing 11 through the first circulation descending zone 132 inside the first return cylinder 12, and the liquid in the mixture is discharged through the water outlet 192.

[0077] Optionally, the projection of the end of the second return cylinder 17 close to the three-phase separator 14 on the circumferential surface of the housing 11 at least partially overlaps with the projection of the second part 142 of the three-phase separator 14 on the circumferential surface of the housing 11.

[0078] In this embodiment, the inner diameter of the second return cylinder 17 is larger than the outer diameter of the second part 142 of the three-phase separator 14, and the second part 142 of the three-phase separator 14 is inside the second return cylinder 17, which is convenient for forming a return channel between the second return cylinder 17 and the three-phase separator 14 and is beneficial to realizing the separation of solid, liquid and gas.

[0079] Optionally, the outer diameter of the first return cylinder 12 is smaller than the inner diameter of the first part 141 of the three-phase separator 14; an opening 121 communicating the first circulation ascending zone 131 and the first circulation descending zone 132 is provided at one end of the first return cylinder 12 close to the water inlet 111.

[0080] In this embodiment, the outer diameter of the first return cylinder 12 is smaller than the inner diameter of the first part 141 of the three-phase separator 14, which is beneficial to introducing part of the mixture in the first return cylinder 12 into the three-phase separator 14 under the air-lift effect. By providing the opening 121, it is beneficial to mix the mixture returning from the first circulation descending zone 132 with the mixture in the first circulation ascending zone 131.

[0081] Optionally, the reactor 1 further includes a baffle plate 18, which is arranged on the circumferential wall of the housing 1 close to the first return cylinder 12 between the three-phase separator 14 and the first return cylinder 12; there is a gap between the baffle plate 18 and the first part 141 of the three-phase separator 14.

[0082] In this embodiment, the mixture flowing back and descending from the second circulation descending zone 152 enters the first circulation descending zone 132 through the gap of the baffle plate 18. By providing the gap, it is beneficial to the return of the anaerobic ammonium oxidation granular sludge.

[0083] Optionally, the reactor 1 further includes an overflow weir 191 and a water outlet 192.

[0084] The overflow weir 191 is arranged on the peripheral wall of the housing 11 near the air outlet 112; the water outlet 192 is arranged at one end of the housing 11 near the air outlet 112, and both the overflow weir 191 and the water outlet 192 communicate the inner cavity of the housing 11 with the external environment.

[0085] In this embodiment, the separated liquid is discharged from the housing 11 through the overflow weir 191 and the water outlet 192.

[0086] Optionally, the reactor 1 further includes a sampling port 193, and a sample of the anaerobic ammonium oxidation granular sludge can be obtained through the sampling port 193.

[0087] Based on the same inventive concept, an embodiment of the present application provides a cultivation system 2 for anaerobic ammonium oxidation granular sludge, as Figure 2 shown, including a detection device 21 and the reactor 1 provided in the above embodiment. The detection device 21 detects the dissolved oxygen concentration, temperature, and pH value in the first circulating rising area 131 of the reactor 1.

[0088] In this embodiment, the detection device 21 includes a dissolved oxygen concentration probe 211, a pH probe 212, and a temperature probe 213. The cultivation system 2 further includes a detection terminal 26, and the detection terminal 26 displays the dissolved oxygen concentration value detected by the dissolved oxygen concentration probe 211, the pH value detected by the pH probe 212, and the temperature value detected by the temperature probe 213.

[0089] Optionally, the cultivation system 2 further includes a water inlet storage tank 22, a nitrifying sludge storage tank 23, an anaerobic ammonium oxidation sludge storage tank 24, and an alkali storage tank 25 that are electrically connected to the reactor 1. The water inlet storage tank 22 adds a culture medium to the reactor 1, the nitrifying sludge storage tank 23 adds nitrifying sludge to the reactor 1, the anaerobic ammonium oxidation sludge storage tank 24 inoculates anaerobic ammonium oxidation sludge into the reactor 1, and the alkali storage tank 25 adds an alkaline substance to the reactor 1 to adjust the pH value in the reactor 1.

[0090] In this embodiment, this cultivation system can synchronously achieve complete mixing of the mixture in the reactor and continuous water inlet, effectively control the concentration of nitrite nitrogen in the reactor, and avoid the excessive content of free nitrous acid in the conventional SBR reactor from inhibiting the activity of anaerobic ammonium oxidation bacteria, thereby facilitating the growth of anaerobic ammonium oxidation granular sludge.

[0091] Optionally, the cultivation system 2 further includes a constant temperature water tank 27, and the constant temperature water tank 27 is used to transport constant temperature water to the outer shell 11 of the reactor 1 to keep the temperature of the outer shell 11 at 30°C to 40°C.

[0092] The cultivation system 2 may further include other necessary connection devices, or necessary devices set according to actual situations. These devices are all existing and will not be elaborated in detail here.

[0093] Based on the same inventive concept, an embodiment of the present application provides a method for culturing anaerobic ammonium oxidation granular sludge. The process schematic diagram of this culturing method is as shown in Figure 3 and includes the following steps S1 - S2:

[0094] S1: Add nitrifying sludge and a culture medium substrate into reactor 1, aerate in the first circulation rising zone 131 of reactor 1, and detect the dissolved oxygen concentration in reactor 1 until the dissolved oxygen concentration stabilizes within the first designed concentration.

[0095] In this embodiment, during the aeration process, increasing the content of dissolved oxygen easily affects the activity of anaerobic ammonium oxidation sludge. By adding nitrifying sludge, the dissolved oxygen concentration in the first circulation rising zone 131 is controlled to facilitate maintaining an oxygen-limited environment in reactor 1 and the dissolved oxygen required for anaerobic ammonium oxidation sludge, and to ensure the activity of anaerobic ammonium oxidation sludge.

[0096] Optionally, the concentration of nitrifying sludge is not less than 500 mg / L and not more than 3000 mg / L.

[0097] Optionally, the first designed concentration is not more than 0.5 mg / L.

[0098] S2: When the dissolved oxygen concentration stabilizes within the first designed concentration, add anaerobic ammonium oxidation sludge into reactor 1 to obtain a first mixture. Based on the air-lift effect, perform a first circulation and a second circulation on the first mixture. The first circulation includes alternately rising in the first circulation rising zone 131 and descending in the first circulation descending zone 132, and the second circulation includes alternately rising in the second circulation rising zone 151 and descending in the second circulation descending zone 152.

[0099] In this embodiment, the first mixture alternately rises in the first circulation rising zone 131 and refluxes and descends in the first circulation descending zone 132, thereby enabling the anaerobic ammonium oxidation sludge and the culture medium substrate in the mixture to be fully contacted, thus improving the mass transfer efficiency, and further increasing the growth rate of anaerobic ammonium oxidation granular sludge; and alternately rises in the second circulation rising zone 151 and refluxes and descends in the second circulation descending zone 152, and refluxes and descends to the bottom of the housing 11 through the first circulation descending zone 132, further promoting the complete mixing and contact of the anaerobic ammonium oxidation sludge and the culture medium substrate, thereby improving the mass transfer efficiency and the growth rate of anaerobic ammonium oxidation granular sludge, and during the second circulation process, the anaerobic ammonium oxidation sludge refluxes to the bottom of the housing 11 to be able to maintain a sufficient sludge concentration in reactor 1.

[0100] Optionally, the anaerobic ammonium oxidation sludge includes at least one of anaerobic ammonium oxidation granular sludge and anaerobic ammonium oxidation flocculent sludge, and the concentration of the anaerobic ammonium oxidation sludge is not less than 50 mg / L.

[0101] Optionally, the concentration of anaerobic ammonium oxidation sludge may not exceed 300 mg / L.

[0102] Optionally, the culture medium includes high-ammonia-nitrogen wastewater and sodium nitrite. The preset concentration ratio of the influent ammonia nitrogen in the high-ammonia-nitrogen wastewater to the influent nitrite nitrogen in the sodium nitrite is 1:1 to 2:1, and the concentration of the influent nitrite nitrogen does not exceed 80 mg / L.

[0103] In this embodiment, the influent ammonia nitrogen refers to the ammonia nitrogen in the input high-ammonia-nitrogen wastewater, and the influent nitrite nitrogen refers to the nitrite nitrogen in the input sodium nitrite. The concentration of the influent nitrite nitrogen can be not less than 40 mg / L and not more than 80 mg / L.

[0104] Optionally, the high-ammonia-nitrogen wastewater includes at least one of the anaerobic effluent, biogas slurry, and aged landfill leachate of food waste water, food processing wastewater or aquaculture wastewater.

[0105] In this embodiment, using the ammonia nitrogen in the high-ammonia-nitrogen wastewater helps to reduce the consumption of ammonia nitrogen and alkalinity, thereby reducing the cultivation cost of anaerobic ammonium oxidation granular sludge, and at the same time enabling the treatment of high-ammonia-nitrogen wastewater.

[0106] Optionally, based on the air-lift effect, the first mixture is subjected to a first circulation and a second circulation, including:

[0107] First, the first mixture is subjected to three-phase separation to obtain a first gaseous substance, a first solid substance and a first liquid substance respectively, and the first liquid substance is output.

[0108] Secondly, the concentrations of the effluent ammonia nitrogen and the effluent nitrite nitrogen in the first liquid substance are detected. If the concentration of the effluent nitrite nitrogen is higher than 20 mg / L, the hydraulic retention time of reactor 1 is extended; if the concentration of the effluent nitrite nitrogen is lower than the first threshold, the hydraulic retention time of reactor 1 is shortened or the concentrations of the influent ammonia nitrogen and the influent nitrite nitrogen are increased according to a preset concentration ratio.

[0109] In this embodiment, the initial hydraulic retention time can be 6 hours - 12 hours. The effluent ammonia nitrogen refers to the ammonia nitrogen in the output first liquid substance, and the effluent nitrite nitrogen refers to the nitrite nitrogen in the output first liquid substance. The hydraulic retention time of reactor 1 can be extended in units of one hour.

[0110] Optionally, if the concentration of the effluent nitrite nitrogen is lower than the first threshold, shortening the hydraulic retention time of reactor 1 or increasing the concentrations of the influent ammonia nitrogen and the influent nitrite nitrogen according to a preset concentration ratio includes:

[0111] When the concentration of the effluent nitrite nitrogen is lower than 5 mg / L, the hydraulic retention time of reactor 1 is shortened by 1 hour; or,

[0112] Increase the concentration of influent nitrite nitrogen by 20 mg / L, and at the same time increase the concentration of influent ammonia nitrogen according to the preset concentration ratio of influent ammonia nitrogen to influent nitrite nitrogen of 1:1 to 2:1.

[0113] In this embodiment, the method of increasing the concentration of the culture medium in a gradient manner can ensure sufficient supply of the culture medium available for the anaerobic ammonium oxidation sludge in the reactor 1, and at the same time, the concentration of the culture medium is not too high to affect the activity of the anaerobic ammonium oxidation sludge, so that the anaerobic ammonium oxidation sludge is in a state of high-speed proliferation.

[0114] Optionally, based on the air-lift effect, perform the first circulation and the second circulation on the first mixture, including controlling the temperature in the reactor 1 to be 30°C to 40°C, and adding a sodium bicarbonate solution to the reactor to control the pH value to be 7.5 to 8.3.

[0115] The following introduces the situation of the anaerobic ammonium oxidation sludge of the present application with specific embodiments.

[0116] A total of three groups of embodiments are carried out. Table 1 shows the initial inoculation concentrations and initial hydraulic retention times of nitrifying sludge, anaerobic ammonium oxidation granular sludge and culture medium.

[0117] Table 1

[0118]

[0119] After cultivation, the growth of the anaerobic ammonium oxidation granular sludge is shown in Table 2. The horizontal bar in Example 1 in Table 2 represents that the concentration of the anaerobic ammonium oxidation granular sludge has no change compared with that at 62 days.

[0120] Table 2

[0121]

[0122]

[0123] The anaerobic ammonium oxidation granular sludge is in the adaptation period within the first month. By performing data fitting on the growth value of the anaerobic ammonium oxidation granular sludge concentration after one month, it can be calculated that the doubling time of the anaerobic ammonium oxidation granular sludge in Example 1 is 12.21 days, the doubling time of the anaerobic ammonium oxidation granular sludge in Example 1 is 13.21 days, and the doubling time of the anaerobic ammonium oxidation granular sludge in Example 3 is 13.34 days.

[0124] When cultivating the anaerobic ammonium oxidation granular sludge in the existing reactor, by performing data fitting on the growth value of the anaerobic ammonium oxidation granular sludge concentration after one month, the doubling time of its anaerobic ammonium oxidation granular sludge is 20 days - 30 days.

[0125] Then, compared with the doubling time of the existing anaerobic ammonium oxidation granular sludge, the cultivation method of anaerobic ammonium oxidation granular sludge provided by this application shortens the cultivation time by 40%-59%, which is beneficial to improving the growth rate of anaerobic ammonium oxidation granular sludge.

[0126] Applying the embodiments of this application can at least achieve the following beneficial effects:

[0127] 1. In the embodiments of this application, by setting the first reflux cylinder, a first circulation zone is formed in a part of the inner cavity of the housing. The mixture in the reactor rises from the first circulation rising zone, and part of the mixture flows back and descends to the bottom of the housing from the first circulation descending zone due to the action of gravity and mixes with the mixture at the bottom. During the first circulation process, the mixture alternately circulates, rising in the first circulation rising zone and flowing back and descending in the first circulation descending zone. Thereby, the anaerobic ammonium oxidation sludge and the culture medium in the mixture can be fully contacted, so as to improve the mass transfer efficiency and further improve the growth rate of anaerobic ammonium oxidation granular sludge.

[0128] 2. In the embodiments of this application, by setting the three-phase separator, another part of the inner cavity of the housing forms a second circulation zone. During the second circulation process, the mixture alternately circulates, rising in the second circulation rising zone and flowing back and descending in the second circulation descending zone, and flows back and descends to the bottom of the housing through the first circulation descending zone, further promoting the complete mixing and contact of anaerobic ammonium oxidation sludge and culture medium, thereby improving the mass transfer efficiency and the growth rate of anaerobic ammonium oxidation granular sludge. And during the second circulation process, the anaerobic ammonium oxidation sludge flows back to the bottom of the housing to maintain a sufficient sludge concentration in the reactor.

[0129] 3. In the embodiments of this application, by setting an aeration device in the first circulation rising zone, the aeration device introduces air into the first circulation rising zone. Under the air-lift action, the mixture can perform the first circulation and the second circulation, and the scouring of the air-lift action helps the formation of granular anaerobic ammonium oxidation sludge.

[0130] Those skilled in the art of this technology can understand that the steps, measures, and solutions in the various operations, methods, and processes discussed in this application can be alternated, changed, combined, or deleted. Further, the other steps, measures, and solutions in the various operations, methods, and processes discussed in this application can also be alternated, changed, rearranged, decomposed, combined, or deleted. Further, the steps, measures, and solutions in the prior art that are the same as those disclosed in this application can also be alternated, changed, rearranged, decomposed, combined, or deleted.

[0131] In the description of the present application, the directions or positional relationships indicated by terms such as "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the exemplary directions or positional relationships shown in the drawings, and are for the convenience of describing or simplifying the embodiments of the present application, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0132] The terms "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0133] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0134] In the description of this specification, specific features, structures, materials, or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0135] It should be understood that although the steps in the flowcharts of the drawings are shown sequentially according to the indications of the arrows, the execution order of these steps is not limited to the order indicated by the arrows. Unless otherwise clearly stated in this document, in some implementation scenarios of the embodiments of the present application, the steps in each process can be executed in other orders according to requirements. Moreover, some or all of the steps in each flowchart may include multiple sub-steps or multiple stages based on the actual implementation scenario. Some or all of these sub-steps or stages can be executed at the same time or at different times. In the scenario where the execution times are different, the execution order of these sub-steps or stages can be flexibly configured according to requirements, and the embodiments of the present application do not limit this.

[0136] The above are only some implementation manners of the present application. It should be noted that for those of ordinary skill in the art, without departing from the technical concept of the solution of the present application, adopting other similar implementation means based on the technical idea of the present application also belongs to the protection scope of the embodiments of the present application.

Claims

1. A reactor for anaerobic ammonium oxidation granular sludge, characterized in that, Comprising: A housing with a water inlet and an air outlet provided at both ends respectively; A first reflux cylinder disposed within the housing, a part of the inner cavity of the housing forming a first circulation zone, the first circulation zone including a first circulation descending zone located within the first reflux cylinder and a first circulation ascending zone located between the first reflux cylinder and the housing; One end of the first reflux cylinder communicates with the water inlet of the housing; A three-phase separator is disposed between the other end of the first reflux cylinder within the housing and the air outlet of the housing and they all communicate. Another part of the inner cavity of the housing forms a second circulation zone, the second circulation zone including a second circulation ascending zone located within the three-phase separator and a second circulation descending zone located between the three-phase separator and the housing; A baffle plate, the baffle plate is disposed on the peripheral wall of the housing near the first reflux cylinder between the three-phase separator and the first reflux cylinder; there is a gap between the baffle plate and the first part of the three-phase separator, and the mixture flowing back and descending from the second circulation descending zone enters the first circulation descending zone through the gap of the baffle plate; An aeration device, the aeration device is disposed in the first circulation ascending zone; The reactor is used to aerate the added nitrifying sludge and culture medium in the first circulation ascending zone and detect the dissolved oxygen concentration of the reactor until the dissolved oxygen concentration is stabilized within the first designed concentration; when the dissolved oxygen concentration is stabilized within the first designed concentration, anaerobic ammonium oxidation sludge is added to the reactor to obtain a first mixture; The reactor is used to perform the first circulation and the second circulation on the first mixture based on the air-lift effect, including: performing three-phase separation on the first mixture to respectively obtain a first gaseous substance, a first solid substance and a first liquid substance, and outputting the first liquid substance; detecting the concentrations of ammonia nitrogen and nitrite nitrogen in the effluent of the first liquid substance; The reactor is used to adjust the concentration of the culture medium based on a gradient increase method: if the concentration of nitrite nitrogen in the effluent is higher than 20 mg / L, the hydraulic retention time of the reactor is prolonged; if the concentration of nitrite nitrogen in the effluent is lower than the first threshold, the hydraulic retention time of the reactor is shortened or the concentrations of influent ammonia nitrogen and influent nitrite nitrogen are increased according to a preset concentration ratio, including: when the concentration of nitrite nitrogen in the effluent is lower than 5 mg / L, the hydraulic retention time is shortened by 1 hour; or the concentration of influent nitrite nitrogen is increased by 20 mg / L, and at the same time the concentration of influent ammonia nitrogen is increased according to the preset concentration ratio of influent ammonia nitrogen and influent nitrite nitrogen of 1:1 to 2:

1.

2. The reactor according to claim 1, characterized in that, The three-phase separator includes a first part close to the first reflux cylinder and a second part far from the first reflux cylinder, and the diameter of the first part is larger than that of the second part; The reactor further includes a second reflux cylinder disposed within the housing, one end of the second reflux cylinder close to the three-phase separator communicates with the second part of the three-phase separator, and the other end communicates with the air outlet of the housing; the inner diameter of the second reflux cylinder is larger than the outer diameter of the second part of the three-phase separator; The outer diameter of the first return cylinder is smaller than the inner diameter of the first part of the three-phase separator; an opening communicating the first circulation rising area and the first circulation falling area is provided at one end of the first return cylinder close to the water inlet.

3. A cultivation system for anaerobic ammonium oxidation granular sludge, characterized in that, It includes a detection device and the reactor according to any one of claims 1-2, and the detection device detects the dissolved oxygen concentration, temperature and pH value in the first circulation rising area of the reactor.

4. A cultivation method for anaerobic ammonium oxidation granular sludge, characterized in that, It includes: Adding nitrifying sludge and culture medium into the reactor according to any one of claims 1-2, aerating in the first circulation rising area of the reactor, and detecting the dissolved oxygen concentration of the reactor until the dissolved oxygen concentration is stabilized within the first designed concentration; the first designed concentration is not greater than 0.5 mg / L; the concentration of the nitrifying sludge is not less than 500 mg / L and not greater than 3000 mg / L; the culture medium includes high-ammonia-nitrogen wastewater and sodium nitrite, and the preset concentration ratio of the influent ammonia nitrogen in the high-ammonia-nitrogen wastewater to the influent nitrite nitrogen in the sodium nitrite is 1:1 to 2:1, and the concentration of the influent nitrite nitrogen does not exceed 80 mg / L; When the dissolved oxygen concentration is stabilized within the first designed concentration, adding anaerobic ammonium oxidation sludge into the reactor to obtain a first mixture; the anaerobic ammonium oxidation sludge includes at least one of anaerobic ammonium oxidation granular sludge and anaerobic ammonium oxidation flocculent sludge; the concentration of the anaerobic ammonium oxidation sludge is not less than 50 mg / L; Based on the air-lift effect, performing a first circulation and a second circulation on the first mixture, including: performing three-phase separation on the first mixture to respectively obtain a first gaseous substance, a first solid substance and a first liquid substance, and outputting the first liquid substance; detecting the concentrations of the effluent ammonia nitrogen and the effluent nitrite nitrogen in the first liquid substance, if the concentration of the effluent nitrite nitrogen is higher than 20 mg / L, then extending the hydraulic retention time of the reactor; if the concentration of the effluent nitrite nitrogen is lower than the first threshold, then shortening the hydraulic retention time of the reactor or increasing the concentrations of the influent ammonia nitrogen and the influent nitrite nitrogen according to the preset concentration ratio; the first circulation includes ascending in the first circulation rising area and descending in the first circulation falling area alternately in a cycle, and the second circulation includes ascending in the second circulation rising area and descending in the second circulation falling area alternately in a cycle.

5. The cultivation method according to claim 4, characterized in that, If the concentration of the effluent nitrite nitrogen is lower than the first threshold, then shortening the hydraulic retention time of the reactor or increasing the concentrations of the influent ammonia nitrogen and the influent nitrite nitrogen according to the preset concentration ratio, including: When the concentration of the effluent nitrite nitrogen is lower than 5 mg / L, the hydraulic retention time is shortened by 1 hour; or, The concentration of the influent nitrite nitrogen is increased by 20 mg / L, and at the same time, the concentration of the influent ammonia nitrogen is increased according to the preset concentration ratio of the influent ammonia nitrogen and the influent nitrite nitrogen of 1:1 to 2:

1.

6. The cultivation method according to claim 4, characterized in that, The high-ammonia-nitrogen wastewater includes at least one of anaerobic effluent, biogas slurry, and aged landfill leachate of food waste, food wastewater or aquaculture wastewater.

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