Upflow enhanced anaerobic ammonia oxidation granular sludge continuous flow process granulation system and method

Abstract

The application discloses a kind of upflow enhanced anaerobic ammonia oxidation granular sludge continuous flow process granulation system and method, it is related to wastewater treatment technical field, including: medicine pool, integrated reaction pool, granular enhanced upflow selection pool and vertical flow sedimentation tank, wherein granular enhanced upflow selection pool is sequentially provided with water inlet channel, water distribution pipe, water distribution baffle, inclined hopper, finally through the top drainage channel of granular enhanced upflow selection pool and vertical flow sedimentation tank are connected, additionally through sludge discharge pipe and perforated sludge discharge pipe and integrated reaction pool are connected;The system has reasonable structure design, easy to operate and use, low running and maintenance cost, part of nitrogen element is removed by anaerobic ammonia oxidation reaction in the granulation method, without additional carbon source, has advantage for carbon source deficient wastewater denitrification;Sludge production is less, reduces sludge disposal cost and operating cost.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and more specifically, relates to a granulation system and method for a continuous flow process of upflow enhanced anaerobic ammonia oxidation granular sludge. Background Technology

[0002] Anaerobic ammonia oxidation (ANAO) technology, a novel biological nitrogen removal process, is considered to have advantages over traditional activated sludge processes, including independence from carbon sources, low energy consumption, high nitrogen removal efficiency, and low sludge production. It has become a research hotspot in wastewater treatment both domestically and internationally. Some nitrification / anaerobic ammonia oxidation (PN / A) processes based on this technology offer advantages such as a reduction in aeration volume of approximately 60% and a reduction in sludge production of 90%. In this process, ammonia-oxidizing bacteria (AOB) remove a portion of the ammonia nitrogen (NH4+) from the influent. + -N) is oxidized to nitrite nitrogen (NO2) - -N), and then anaerobic ammonia oxidizing bacteria (AnAOB) utilize the remaining NH4 under anaerobic conditions. + -N and NO2 - -N is converted into nitrogen gas (N2), and a small amount of nitrate nitrogen (NO3) is generated. - -N). Currently, the PN / A process is widely used to treat high-ammonia nitrogen wastewater such as sludge digestion liquid, dyeing and printing wastewater, and landfill filtrate, and is gradually being applied to large-scale municipal wastewater treatment. It is considered a key technology to support wastewater treatment plants in achieving the vision of carbon neutrality.

[0003] Currently, biofilm systems are mainly used in China to treat wastewater with high ammonia nitrogen levels. However, biofilm systems are difficult to inoculate, and transporting seed mud consumes a lot of manpower and resources, making them less economical.

[0004] Compared to simple biofilm systems, integrated PN / A granular sludge systems are more suitable for treating high ammonia nitrogen wastewater. This process fully utilizes the high efficiency of the granular sludge system, achieving a large volumetric loading rate and good operational stability within a single reactor. Furthermore, by using granular sludge as the carrier for the PN / A reaction, it offers significant economic advantages and greater controllability compared to biofilm systems in terms of operation management and widespread application.

[0005] This invention is proposed based on this research background, aiming to create a method for rapidly cultivating anaerobic ammonia oxidation granular sludge in a continuous flow process to treat high ammonia nitrogen wastewater, and to help realize the engineering application of integrated PN / A-granular sludge systems. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a continuous flow granulation system and method for anaerobic ammonia oxidation granular sludge. This system has advantages such as reasonable structural design, convenient operation and use, low operating and maintenance costs, relatively low energy consumption, and no need for additional carbon sources. It can achieve rapid formation and stable maintenance of anaerobic ammonia oxidation granular sludge, providing a foundation for the application of this process.

[0007] To achieve the above objectives, the present invention provides a continuous flow granulation system for upflow enhanced anaerobic ammonia oxidation granular sludge process, comprising:

[0008] A chemical inlet tank is provided, with its inlet end connected to the raw water inlet and its outlet end connected to the inlet end of an integrated reaction tank via a chemical inlet pump. The inlet end of the integrated reaction tank is connected to both the chemical inlet tank and the raw water inlet.

[0009] The particle-enhanced upflow selective tank includes an inlet channel and a distribution pipe. The outlet end of the integrated reaction tank is connected to the inlet channel through an outlet hole. The bottom of the inlet channel is connected to the distribution pipe. The lower end of the distribution pipe extends to the bottom of the particle-enhanced upflow selective tank and is equipped with a distribution baffle. The bottom of the particle-enhanced upflow selective tank is equipped with a sloping sludge hopper. The bottom of the sloping sludge hopper is equipped with a perforated sludge discharge pipe, which is connected to an air-lift device. The top of the particle-enhanced upflow selective tank is equipped with a drainage channel.

[0010] The vertical flow sedimentation tank is connected to the drainage ditch through an inlet hole, and the vertical flow sedimentation tank is connected to the integrated reaction tank through a sludge discharge pipe and a sludge return pump.

[0011] Optionally, the integrated reaction tank includes:

[0012] The pool body is a semi-enclosed structure;

[0013] A perforated aerator is installed at the bottom of the pool.

[0014] Aeration heads are installed at the bottom of the pool.

[0015] A blower is installed outside the tank body. The blower is connected to the perforated aerator and the aeration head through an aeration pipeline. A gas flow meter and valve are installed on the aeration pipeline.

[0016] Optionally, the integrated reaction tank includes multiple sequentially connected compartments, each compartment being equipped with the perforated aerator and the aeration head, and the flow holes of each compartment being staggered.

[0017] Optionally, the outlet of the air-lift device and the sludge discharge pipe are both connected to the first chamber.

[0018] Optionally, the particle-enhanced upflow selection tank includes a selection tank body, which is a semi-enclosed structure. The inlet channel is located on both sides of the top of the selection tank body. The water distribution pipe is arranged vertically with a flared end at the bottom. The drainage channel is located in the center.

[0019] Optionally, the vertical flow sedimentation tank includes:

[0020] A sedimentation tank, wherein a single-sided outlet channel is provided on one side of the sedimentation tank, and a sludge hopper is provided at the bottom of the sedimentation tank, and the sludge discharge pipe is connected to the lower part of the sludge hopper;

[0021] A central inlet pipe is centrally located within the sedimentation tank. The inlet end of the central inlet pipe is connected to the drainage ditch, and the outlet end of the central inlet pipe is located below the sedimentation tank.

[0022] Optionally, the drug feeding tank includes a drug feeding tank body, which is a semi-enclosed structure. A stirrer is installed inside the drug feeding tank body, and a primary sedimentation water inlet pump is installed at the front end of the drug feeding tank. The primary sedimentation water inlet pump is connected to the drug feeding tank and the integrated reaction tank respectively through a primary sedimentation water inlet pipe. A dosing pump is also installed between the drug feeding tank and the integrated reaction tank.

[0023] This invention provides a granulation method for a continuous flow granulation process of upflow enhanced anammox granulation sludge, utilizing the aforementioned upflow enhanced anammox granulation sludge continuous flow granulation system. The method includes:

[0024] Step 1: Add nitrifying activated sludge and anaerobic ammonia oxidation biofilm seed sludge from the aeration tank of the municipal wastewater treatment plant to the integrated reactor. Start the primary sedimentation water inlet pump to introduce the primary sedimentation water into the chemical inlet tank, add ammonium bicarbonate and sodium bicarbonate to prepare high ammonia nitrogen wastewater, maintaining the ammonia nitrogen concentration at 500-1000 mg / L. Introduce the primary sedimentation water into the integrated reactor, start the chemical dosing pump, control the chemical ratio, and adjust the ammonia nitrogen concentration in the first compartment of the integrated reactor to 300-400 mg / L. Start the blower, adjust the valves and gas flow meter to control the DO to 0.1-0.5 mg / L. Measure the sludge concentration and mixed sludge particle size, and start the sludge return pump and air lift device intermittently to control the sludge concentration in the integrated reactor to 4000-5000 mg / L. Control the temperature of the mixed liquor in the integrated reactor to 27-35℃ and the pH value to 7-8.4.

[0025] Step 2: Adjust the influent NH4 based on the pH, temperature, nitrogen content, and sludge concentration of the mixed liquor in the integrated reactor. +-N load refers to adjusting the influent flow rate, aeration rate, and sludge return flow rate. When the free ammonia (FA) concentration is high, reduce the influent ammonia nitrogen concentration or reduce the influent flow rate; when the free nitrite (FNA) concentration is high, reduce the aeration rate; when the MLSS concentration decreases, increase the sludge return flow rate.

[0026] Step 3: Adjust the sludge return flow rate and influent flow rate of the granular enhanced upflow selector and vertical flow sedimentation tank according to the sludge concentration in the integrated reactor; adjust the upward flow velocity of the granular enhanced upflow selector to 0.8-2.0 m / h according to the sludge particle size and sludge concentration growth; during the initial operation of the process, the degree of granulation in the system is low, so control the upward flow velocity to less than 1 m / h to reduce sludge loss, and gradually form anaerobic ammonia oxidation sludge particles by utilizing hydraulic shear force and sedimentation compression; as the system operates stably and the sludge particle size increases, the upward flow velocity can be gradually increased to 2 m / h to increase the washing of flocculent sludge.

[0027] Step 4: Adjust the usage frequency of the perforated aerator and the sludge return flow rate of the particle-enhanced upflow selector tank according to the particle size distribution of the particles in the integrated reactor. That is, increase the hydraulic shear force in the integrated reactor by opening the perforated aerator; adjust the sludge return flow rate of the particle-enhanced upflow selector tank to improve the washing effect of flocculent sludge and the compression and sedimentation effect in the tank.

[0028] This invention provides a granulation system and method for a continuous flow granulation process of upflow enhanced anaerobic ammonia oxidation granular sludge, the advantages of which are:

[0029] 1. This system adopts a continuous flow process to rapidly cultivate anaerobic ammonia oxidation granular sludge. It is easy to operate and manage, has low facility costs, stable integrated reaction, and strong resistance to low temperature, water volume, and water quality shocks.

[0030] 2. The granular enhanced upflow selective tank in this system can compress and settle the sludge in the system, while accelerating the washing process of flocculent sludge, forming a certain biological selective pressure, which greatly helps the formation of anaerobic ammonia oxidation granular sludge.

[0031] 3. The system's combination of perforated aerators and aeration heads allows the integrated reactor to have diverse aeration modes, enabling flexible adjustment of the aeration form during sludge acclimation. This not only provides the necessary oxygen for activated sludge but also provides the necessary shear force for the formation of granular sludge, which is beneficial for the formation of anaerobic ammonia oxidation granular sludge.

[0032] 4. This system has the inherent characteristics of short-cut nitrification anaerobic ammonium oxidation reaction: low oxygen consumption, reduced energy consumption, partial removal of nitrogen through anaerobic ammonium oxidation reaction, no need for external carbon source, which is advantageous for denitrification of wastewater lacking carbon source; low sludge production, reducing sludge disposal costs and operating costs.

[0033] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0034] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0035] Figure 1 A schematic diagram of a granulation system for a continuous flow granulation process of upflow enhanced anaerobic ammonia oxidation granular sludge is shown according to an embodiment of the present invention.

[0036] Figure 2 A side view of a particle-enhanced upflow selective cell according to an embodiment of the present invention is shown.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Integrated reaction tank; 2. Granular enhanced upflow selective tank; 3. Inlet channel; 4. Water distribution pipe; 5. Vertical flow sedimentation tank; 6. Perforated aerator; 7. Aeration head; 8. Blower; 9. Gas flow meter; 10. Valve; 11. Flow hole; 12. Drainage channel; 13. Inclined sludge hopper; 14. Perforated sludge discharge pipe; 15. Air lift device; 16. Single-sided outlet channel; 17. Sludge hopper; 18. Central inlet pipe; 19. Sludge discharge pipe; 20. Agitator; 21. Primary sedimentation water inlet pump; 22. Chemical inlet pump; 23. Chemical inlet tank; 24. Sludge return pump; 25. Inlet hole; 26. Outlet hole. Detailed Implementation

[0039] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0040] This invention provides a continuous flow granulation system for upflow enhanced anaerobic ammonia oxidation granular sludge process, comprising:

[0041] The inlet of the chemical inlet tank is connected to the raw water inlet, and the outlet of the chemical inlet tank is connected to the inlet of the integrated reaction tank via a chemical inlet pump. The inlet of the integrated reaction tank is connected to both the chemical inlet tank and the raw water inlet.

[0042] The particle-enhanced upflow selective tank includes an inlet channel and a distribution pipe. The outlet end of the integrated reaction tank is connected to the inlet channel through an outlet hole. The bottom of the inlet channel is connected to the distribution pipe. The lower end of the distribution pipe extends to the bottom of the particle-enhanced upflow selective tank and is equipped with a distribution baffle. The bottom of the particle-enhanced upflow selective tank is equipped with a sloping sludge hopper. The bottom of the sloping sludge hopper is equipped with a perforated sludge discharge pipe, which is connected to an air-lift device. The top of the particle-enhanced upflow selective tank is equipped with a drainage channel.

[0043] The vertical flow sedimentation tank is connected to the drainage ditch through an inlet hole, and is connected to the integrated reaction tank through a sludge discharge pipe and a sludge return pump.

[0044] The granulation system consists of a chemical inlet tank, an integrated reaction tank, a granulation-enhanced upflow selection tank, and a vertical flow sedimentation tank. It uses a reasonable ratio of artificially synthesized high-ammonia nitrogen wastewater and primary sedimentation water from municipal sewage as the influent substrate, and inoculates activated sludge from municipal sewage treatment processes and anaerobic ammonia oxidation biofilm sludge, maintaining a pH of 7-8.4 and a temperature of 27-35℃. Through cultivation and acclimatization in the integrated reaction tank and enhanced granulation sludge formation and flocculent sludge washing in the granulation-enhanced upflow selection tank, it can achieve efficient and rapid cultivation of anaerobic ammonia oxidation granular sludge in a continuous flow process.

[0045] Optionally, the integrated reaction tank includes:

[0046] The pool body is a semi-enclosed structure;

[0047] Perforated aerators are installed at the bottom of the pool.

[0048] Aeration heads are installed at the bottom of the tank.

[0049] The blower is located outside the tank. The blower is connected to the perforated aerator and aeration head through the aeration pipeline. The aeration pipeline is equipped with a gas flow meter and valves.

[0050] Specifically, the integrated reactor comprises a semi-enclosed tank body with perforated aerators, aeration heads, and aeration pipelines at the bottom. A blower outside the tank body provides the necessary aeration to the perforated aerators and aeration heads, while gas flow meters and valves on the aeration pipelines regulate the aeration rate. This granulation system utilizes low DO and FA inhibition in a continuous flow process to achieve short-cut nitrification of ammonia nitrogen, ensuring the normal operation of the anammox reaction. Simultaneously, the aeration system within the integrated reactor not only provides the necessary oxygen for activated sludge but also provides the necessary shear force for granular sludge formation. Furthermore, the granular enhanced upflow selective tank compresses and settles the sludge within the system, while simultaneously accelerating the washing process of flocculent sludge, creating a certain biological selective pressure that greatly facilitates the formation of anammox granular sludge.

[0051] Optionally, the integrated reaction tank includes multiple compartments connected in sequence, each compartment having a perforated aerator and an aeration head at its bottom, and the flow holes in each compartment being staggered.

[0052] Specifically, the pool body includes multiple compartments, which are connected by flow holes. The flow holes of the multiple compartments are arranged alternately up and down according to the direction of water flow.

[0053] In one embodiment, the pool comprises four compartments.

[0054] Optionally, the outlet and sludge discharge pipe of the air-lift device are both connected to the first chamber.

[0055] Specifically, the granular enhanced upflow selective tank and the vertical flow sedimentation tank are connected to the first chamber of the integrated reactor, thereby controlling the sludge concentration, mixed liquor temperature, and pH value within the integrated reactor. Based on the pH value, temperature, nitrogen content, and sludge concentration of the mixed liquor in the integrated reactor, the influent NH4 content is adjusted. + -N load refers to adjusting the influent flow rate, aeration rate, and sludge return flow rate. When the free ammonia (FA) concentration is high, reduce the influent ammonia nitrogen concentration or reduce the influent flow rate. When the free nitrite (FNA) concentration is high, reduce the aeration rate. When the MLSS concentration decreases, increase the sludge return flow rate.

[0056] Optionally, the particle-enhanced upflow selective pool includes a selective pool body, which is a semi-enclosed structure. The inlet channel is located on both sides of the top of the selective pool body, the water distribution pipe is installed vertically, the lower end of the water distribution pipe is a funnel, and the drainage channel is located in the center.

[0057] Specifically, the selection tank is also a semi-enclosed structure. An inlet channel is located within the selection tank, connecting to the integrated reaction tank via the inlet water passage in the fourth compartment. A distribution pipe is connected to the bottom of the inlet channel, with a flared end and a distribution baffle. The distribution pipe extends to the bottom of the particle-enhanced upflow selection tank. A sloping sludge hopper is also located at the bottom of the particle-enhanced upflow selection tank, with a perforated sludge discharge pipe positioned at the bottom of the hopper. The pipe has a 10mm orifice and extends beyond the tank wall, connecting to the air-lift device. A drainage channel is located at the center of the top of the particle-enhanced upflow selection tank, connecting to the central inlet pipe of the rear vertical flow sedimentation tank via a rear outlet water passage and a drainage pipe.

[0058] Optionally, the vertical flow sedimentation tank includes:

[0059] The sedimentation tank has a single-sided outlet channel on one side and a sludge hopper at the bottom, with a sludge discharge pipe connected to the bottom of the sludge hopper.

[0060] The central inlet pipe is centrally located within the sedimentation tank. The inlet end of the central inlet pipe is connected to the drainage ditch, while the outlet end of the central inlet pipe is located below the sedimentation tank.

[0061] Specifically, the vertical flow sedimentation tank is equipped with an inlet pipe, a single-sided outlet channel on one side of the tank, and a sludge hopper and sludge discharge pipe at the bottom. The sludge discharge pipe is connected to the first compartment of the integrated reaction tank through a sludge return pump and pipeline.

[0062] Optionally, the drug feeding tank includes a drug feeding tank body, which is a semi-enclosed structure. An agitator is installed inside the drug feeding tank. A primary sedimentation water inlet pump is installed at the front end of the drug feeding tank. The primary sedimentation water inlet pump is connected to the drug feeding tank and the integrated reaction tank through a primary sedimentation water inlet pipe. A dosing pump is also installed between the drug feeding tank and the integrated reaction tank.

[0063] Specifically, a primary sedimentation water inlet pump is installed at the front end of the chemical inlet tank, which is connected to the primary sedimentation water inlet pipe to provide the required primary sedimentation water to the integrated reaction tank and the chemical inlet tank; the chemical inlet tank is a semi-enclosed tank body equipped with a stirrer, which adjusts the inlet water quality according to the biochemical needs of the integrated reaction tank, and is connected to the integrated reaction tank through the chemical inlet pump and dosing pipeline.

[0064] In one embodiment, each pool is equipped with a heat preservation system.

[0065] This invention also provides a granulation method for a continuous flow granulation process of anaerobic ammonia oxidation granules, utilizing the aforementioned continuous flow granulation system of anaerobic ammonia oxidation granules. The method includes:

[0066] Activated sludge with nitrification function and anaerobic ammonia oxidation biofilm seed sludge are added into the integrated reaction tank;

[0067] Start the feed pump to prepare ammonia nitrogen wastewater by mixing the primary sedimentation water with ammonium bicarbonate and sodium bicarbonate, and introduce it into the integrated reaction tank;

[0068] Control the feed ratio in the integrated reaction tank and adjust the ammonia nitrogen concentration of the mixture;

[0069] The air-lift device and sludge return pump are adjusted and controlled based on the measured sludge concentration and mixed sludge particle size.

[0070] Specifically, this system is used to cultivate anaerobic ammonia oxidation granular sludge. Activated sludge with nitrification capabilities, taken from the aeration tank of a municipal wastewater treatment plant, and anaerobic ammonia oxidation biofilm seed sludge are added to the integrated reactor. The primary sedimentation influent pump is started, introducing the primary sedimentation water into the chemical inlet tank. Ammonium bicarbonate and sodium bicarbonate are added to prepare high-ammonia nitrogen wastewater, maintaining the ammonia nitrogen concentration at 500-1000 mg / L. The primary sedimentation water is then introduced into the integrated reactor, the chemical inlet pump is started, and the chemical ratio is controlled to adjust the ammonia nitrogen concentration in the first compartment of the integrated reactor to 300 mg / L. -400mg / L; start the blower and adjust the valve using the gas flow meter to control DO at 0.1-0.5mg / L; measure the sludge concentration and mixed sludge particle size, and start the sludge return pump and air lift device intermittently to control the sludge concentration in the integrated reactor to 4000-5000mg / L, the temperature of the mixed liquor in the integrated reactor to 27-35℃, and the pH value to 7-8.4; adjust the influent NH4 based on the pH value, temperature, nitrogen index, and sludge concentration of the mixed liquor in the integrated reactor. + - N-load refers to adjusting the influent flow rate, aeration rate, and sludge return flow rate. When the free ammonia (FA) concentration is high, the influent ammonia nitrogen concentration or influent flow rate is reduced. When the free nitrite (FNA) concentration is high, the aeration rate is reduced. When the MLSS concentration decreases, the sludge return flow rate is increased. The sludge return flow rate and influent flow rate of the granular enhanced upflow selector and vertical flow sedimentation tank are adjusted according to the sludge concentration in the integrated reactor. The upward flow velocity of the granular enhanced upflow selector is adjusted to 0.8-2.0 m / h according to the sludge particle size and sludge concentration growth. The frequency of use of the perforated aerator and the sludge return flow rate of the granular enhanced upflow selector are adjusted according to the particle size distribution in the integrated reactor. That is, by opening the perforated aerator, the hydraulic shear force in the integrated reactor is increased, the sludge return flow rate of the granular enhanced upflow selector is adjusted, and the washing effect of flocculent sludge and the compression sedimentation effect in the tank are improved.

[0071] Example

[0072] like Figures 1 to 2 As shown, the present invention provides a granulation system for a continuous flow granulation process of upflow enhanced anaerobic ammonia oxidation granular sludge, comprising:

[0073] The inlet of the chemical inlet tank 23 is connected to the raw water inlet, and the outlet of the chemical inlet tank 23 is connected to the inlet of the integrated reaction tank 1 through the chemical inlet pump 22. The inlet of the integrated reaction tank 1 is connected to the chemical inlet tank 23 and the raw water inlet.

[0074] The particle-enhanced upflow selection tank 2 includes an inlet channel 3 and a distribution pipe 4. The outlet end of the integrated reaction tank 1 is connected to the inlet channel 3 through an outlet hole. The bottom of the inlet channel 3 is connected to the distribution pipe 4. The lower end of the distribution pipe 4 extends to the bottom of the particle-enhanced upflow selection tank 2 and is equipped with a distribution baffle. The bottom of the particle-enhanced upflow selection tank 2 is equipped with a sloping mud hopper 13. The bottom of the sloping mud hopper 13 is equipped with a perforated mud discharge pipe 14. The perforated mud discharge pipe 14 is connected to the air lifting device 15. The top of the particle-enhanced upflow selection tank 2 is equipped with a drainage channel 12.

[0075] The vertical flow sedimentation tank 5 is connected to the drainage ditch 12 through the water inlet hole, and the vertical flow sedimentation tank 5 is connected to the integrated reaction tank 1 through the sludge discharge pipe 19 and the sludge return pump 24.

[0076] In this embodiment, the integrated reaction tank 1 includes:

[0077] The pool body is a semi-enclosed structure;

[0078] Perforated aerator 6 is installed at the bottom of the pool;

[0079] Aeration head 7 is located at the bottom of the pool.

[0080] Blower 8 is installed outside the tank. Blower 8 is connected to perforated aerator 6 and aeration head 7 through aeration pipe. Gas flow meter 9 and valve 10 are installed on the aeration pipe.

[0081] In this embodiment, the integrated reaction tank 1 includes multiple compartments connected in sequence. Each compartment is equipped with a perforated aerator 6 and an aeration head 7, and the flow holes 11 of each compartment are staggered.

[0082] In this embodiment, the outlet of the air-lift device 15 and the sludge discharge pipe 19 are both connected to the first compartment.

[0083] In this embodiment, the particle-enhanced upflow selection tank 2 includes a selection tank body, which is a semi-enclosed structure. The inlet channel 3 is located on both sides of the top of the selection tank body. The fourth compartment in the integrated reaction tank 1 is connected to the inlet channel 3 through the outlet hole 26. The water distribution pipe 4 is arranged vertically, and the lower end of the water distribution pipe 4 is a funnel mouth. The drainage channel 12 is located in the center and is connected to the vertical flow sedimentation tank 5 through the inlet hole 25.

[0084] In this embodiment, the vertical flow sedimentation tank 5 includes:

[0085] The sedimentation tank has a single-sided outlet channel 16 on one side and a sludge hopper 17 at the bottom. The sludge discharge pipe 19 is connected to the bottom of the sludge hopper 17.

[0086] The central water inlet pipe 18 is centrally located in the sedimentation tank. The inlet end of the central water inlet pipe 18 is connected to the drainage ditch 12, and the outlet end of the central water inlet pipe 18 is located below the sedimentation tank.

[0087] In this embodiment, the drug inlet tank 23 includes a drug inlet tank body, which is a semi-enclosed structure. A stirrer 20 is installed inside the drug inlet tank body. A primary sedimentation water inlet pump 21 is installed at the front end of the drug inlet tank 23. The primary sedimentation water inlet pump 21 is connected to the drug inlet tank 23 and the integrated reaction tank 1 through a primary sedimentation water inlet pipe. A dosing pump 22 is also installed between the drug inlet tank 23 and the integrated reaction tank 1.

[0088] This invention also provides a granulation method for a continuous flow granulation process of anaerobic ammonia oxidation granular sludge, utilizing the aforementioned continuous flow granulation system of anaerobic ammonia oxidation granular sludge, characterized in that the method includes:

[0089] Step 1: Add nitrifying activated sludge and anaerobic ammonia oxidation biofilm seed sludge from the aeration tank of the municipal wastewater treatment plant to the integrated reactor. Start the primary sedimentation water inlet pump to introduce the primary sedimentation water into the chemical inlet tank, add ammonium bicarbonate and sodium bicarbonate to prepare high ammonia nitrogen wastewater, maintaining the ammonia nitrogen concentration at 500-1000 mg / L. Introduce the primary sedimentation water into the integrated reactor, start the chemical dosing pump, control the chemical ratio, and adjust the ammonia nitrogen concentration in the first compartment of the integrated reactor to 300-400 mg / L. Start the blower, adjust the valves and gas flow meter to control the DO to 0.1-0.5 mg / L. Measure the sludge concentration and mixed sludge particle size, and start the sludge return pump and air lift device intermittently to control the sludge concentration in the integrated reactor to 4000-5000 mg / L. Control the temperature of the mixed liquor in the integrated reactor to 27-35℃ and the pH value to 7-8.4.

[0090] Step 2: Adjust the influent NH4 based on the pH, temperature, nitrogen content, and sludge concentration of the mixed liquor in the integrated reactor. + -N load refers to adjusting the influent flow rate, aeration rate, and sludge return flow rate. When the free ammonia (FA) concentration is high, reduce the influent ammonia nitrogen concentration or reduce the influent flow rate; when the free nitrite (FNA) concentration is high, reduce the aeration rate; when the MLSS concentration decreases, increase the sludge return flow rate.

[0091] Step 3: Adjust the sludge return flow rate and influent flow rate of the granular enhanced upflow selector and vertical flow sedimentation tank according to the sludge concentration in the integrated reactor; adjust the upward flow velocity of the granular enhanced upflow selector to 0.8-2.0 m / h according to the sludge particle size and sludge concentration growth; during the initial operation of the process, the degree of granulation in the system is low, so control the upward flow velocity to less than 1 m / h to reduce sludge loss, and gradually form anaerobic ammonia oxidation sludge particles by utilizing hydraulic shear force and sedimentation compression; as the system operates stably and the sludge particle size increases, the upward flow velocity can be gradually increased to 2 m / h to increase the washing of flocculent sludge.

[0092] Step 4: Adjust the usage frequency of the perforated aerator and the sludge return flow rate of the particle-enhanced upflow selector tank according to the particle size distribution of the particles in the integrated reactor. That is, increase the hydraulic shear force in the integrated reactor by opening the perforated aerator; adjust the sludge return flow rate of the particle-enhanced upflow selector tank to improve the washing effect of flocculent sludge and the compression and sedimentation effect in the tank.

[0093] In summary, the cultivation process of this granulation system is as follows: Secondary sedimentation return sludge from a domestic wastewater treatment plant and biofilm sludge from an anaerobic ammonia oxidation project are inoculated into integrated reactor 1. The sludge concentration of the secondary sedimentation return sludge is approximately 7000-8000 mg / L, with an inoculation mass ratio of 1:1. After inoculation, the sludge concentration is approximately 4000 mg / L. The influent water quality is: COD 100-250 mg / L, NH4+... + -N is 300-400 mg / L, NO2 - -N is 10-30 mg / L, NO3 - -N concentration was 25-35 mg / L; the pH in the tank was controlled at 7.0-8.4, the temperature at 29℃-33℃, and the sludge return ratio at 50%-100%. The initial upflow velocity in the granular enhanced upflow selective tank 2 was 0.8 m / h. When the particle size of the mixed sludge in the system showed an increasing trend and the sludge concentration in the stable system was greater than 3500 mg / L, the upflow velocity was gradually adjusted to 2.0 m / h. The above cultivation process showed that after stable operation, the total nitrogen removal load was greater than 0.5 kgN / m³. 3 / d, the median diameter increased from 80μm to over 200μm.

[0094] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A granulation system for a continuous flow process of upflow enhanced anaerobic ammonia oxidation granular sludge, characterized in that, include: A chemical inlet tank is provided, with its inlet end connected to the raw water inlet and its outlet end connected to the inlet end of an integrated reaction tank via a chemical inlet pump. The inlet end of the integrated reaction tank is connected to both the chemical inlet tank and the raw water inlet. Particle-enhanced upflow selector cell, the particle-enhanced upflow selector cell comprising: Enter The integrated reaction tank has an outlet end connected to the inlet channel via an outlet hole. The bottom of the inlet channel is connected to the distribution pipe. The lower end of the distribution pipe extends to the bottom of the particle-enhanced upflow selective tank and is equipped with a distribution baffle. The bottom of the particle-enhanced upflow selective tank is equipped with a sloping sludge hopper. The bottom of the sloping sludge hopper is equipped with a perforated sludge discharge pipe, which is connected to an air-lift device. The top of the particle-enhanced upflow selective tank is equipped with a drainage channel. The vertical flow sedimentation tank is connected to the drainage ditch through an inlet hole, and the vertical flow sedimentation tank is connected to the integrated reaction tank through a sludge discharge pipe and a sludge return pump; The integrated reaction tank includes: The pool body is a semi-enclosed structure; A perforated aerator is installed at the bottom of the pool. Aeration heads are installed at the bottom of the pool. A blower is installed outside the tank body. The blower is connected to the perforated aerator and the aeration head through an aeration pipeline. A gas flow meter and valve are installed on the aeration pipeline. The particle-enhanced upflow selective pool includes a selective pool body, which is a semi-enclosed structure. The inlet channel is located on both sides of the top of the selective pool body. The water distribution pipe is arranged vertically with a flared end at the bottom. The drainage channel is located in the center.

2. The upflow enhanced anaerobic ammonia oxidation granulation sludge continuous flow process granulation system according to claim 1, characterized in that, The integrated reaction tank includes multiple compartments connected in sequence. Each compartment is equipped with a perforated aerator and an aeration head at its bottom, and the flow holes of each compartment are staggered.

3. The upflow enhanced anaerobic ammonia oxidation granulation sludge continuous flow process granulation system according to claim 2, characterized in that, The outlet of the air-lift device and the sludge discharge pipe are both connected to the first compartment.

4. The upflow enhanced anaerobic ammonia oxidation granulation sludge continuous flow process granulation system according to claim 1, characterized in that, The vertical flow sedimentation tank includes: A sedimentation tank, wherein a single-sided outlet channel is provided on one side of the sedimentation tank, and a sludge hopper is provided at the bottom of the sedimentation tank, and the sludge discharge pipe is connected to the lower part of the sludge hopper; A central inlet pipe is centrally located within the sedimentation tank. The inlet end of the central inlet pipe is connected to the drainage ditch, and the outlet end of the central inlet pipe is located below the sedimentation tank.

5. The upflow enhanced anaerobic ammonia oxidation granulation sludge continuous flow process granulation system according to claim 1, characterized in that, The drug inlet pool includes a drug inlet pool body, which is a semi-enclosed structure. A stirrer is installed inside the drug inlet pool body. A primary sedimentation water inlet pump is installed at the front end of the drug inlet pool. The primary sedimentation water inlet pump is connected to the drug inlet pool and the integrated reaction tank through a primary sedimentation water inlet pipe. A dosing pump is also installed between the drug inlet pool and the integrated reaction tank.

6. A granulation method for an upflow enhanced anammox granular sludge continuous flow process, utilizing the upflow enhanced anammox granular sludge continuous flow process granulation system according to any one of claims 1-5, characterized in that, The method includes: Step 1: Add nitrifying activated sludge and anaerobic ammonia oxidation biofilm seed sludge from the aeration tank of the municipal wastewater treatment plant to the integrated reactor. Start the primary sedimentation water inlet pump to introduce the primary sedimentation water into the chemical inlet tank, add ammonium bicarbonate and sodium bicarbonate to prepare high ammonia nitrogen wastewater, maintaining the ammonia nitrogen concentration at 500-1000 mg / L. Introduce the primary sedimentation water into the integrated reactor, start the chemical dosing pump, control the chemical ratio, and adjust the ammonia nitrogen concentration in the first compartment of the integrated reactor to 300-400 mg / L. Start the blower, adjust the valves and gas flow meter to control the DO to 0.1-0.5 mg / L. Measure the sludge concentration and mixed sludge particle size, and start the sludge return pump and air lift device intermittently to control the sludge concentration in the integrated reactor to 4000-5000 mg / L. Control the temperature of the mixed liquor in the integrated reactor to 27-35℃ and the pH value to 7-8.

4. Step 2: Adjust the influent NH4 based on the pH, temperature, nitrogen content, and sludge concentration of the mixed liquor in the integrated reactor. + -N load refers to adjusting the influent flow rate, aeration rate, and sludge return flow rate. When the free ammonia (FA) concentration is high, reduce the influent ammonia nitrogen concentration or reduce the influent flow rate; when the free nitrite (FNA) concentration is high, reduce the aeration rate; when the MLSS concentration decreases, increase the sludge return flow rate. Step 3: Adjust the sludge return flow rate and influent flow rate of the granular enhanced upflow selector and vertical flow sedimentation tank according to the sludge concentration in the integrated reactor; adjust the upward flow velocity of the granular enhanced upflow selector to 0.8-2.0 m / h according to the sludge particle size and sludge concentration growth; during the initial operation of the process, the degree of granulation in the system is low, so control the upward flow velocity to less than 1 m / h to reduce sludge loss, and gradually form anaerobic ammonia oxidation sludge particles by utilizing hydraulic shear force and sedimentation compression; as the system operates stably and the sludge particle size increases, the upward flow velocity can be gradually increased to 2 m / h to increase the washing of flocculent sludge. Step 4: Adjust the usage frequency of the perforated aerator and the sludge return flow rate of the particle-enhanced upflow selector tank according to the particle size distribution of the particles in the integrated reactor. That is, increase the hydraulic shear force in the integrated reactor by opening the perforated aerator; adjust the sludge return flow rate of the particle-enhanced upflow selector tank to improve the washing effect of flocculent sludge and the compression and sedimentation effect in the tank.

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