Aerobic granular sludge cultivation device, cultivation method and application

Abstract

This invention provides a cultivation device, cultivation method, and application for aerobic granular sludge. The cultivation device includes an influent unit, a reaction unit, and a control unit. Based on the aforementioned specific device, this invention achieves a higher degree of automation, significantly shortening the cultivation time of aerobic granular sludge while maintaining its cultivation quality, thus demonstrating superior prospects for industrial application.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically, to an aerobic granular sludge cultivation device, cultivation method, and application. Background Technology

[0002] Leachate from waste incineration plants refers to the leachate produced during the fermentation of accumulated waste before incineration. It is characterized by complex composition, high pollutant concentration, and high toxicity, making it a typical difficult-to-treat wastewater that poses a significant threat to the aquatic environment. Currently, the mainstream treatment process for waste incineration plant leachate is: pretreatment + anaerobic + aerobic + NF (nanofiltration) + RO (reverse osmosis). The aerobic stage typically employs AO-MBR or multi-stage AO-MBR. However, MBR processes are complex to operate, suffer from significant membrane fouling issues, and have high energy consumption. Those skilled in the art have considered using aerobic granular sludge to replace MBR membranes for the aforementioned aerobic treatment. Aerobic granular sludge is characterized by its compact structure, regular morphology, good settling properties, high biomass, resistance to shock loads, resistance to toxic pollutants, and ability to simultaneously treat pollutants such as carbon, nitrogen, and phosphorus. Furthermore, aerobic granular sludge technology offers advantages such as reduced land area, lower investment and operating costs, and unchanged or even better pollutant removal efficiency. Therefore, it is considered one of the most promising biological wastewater treatment technologies and a new benchmark for aerobic biological treatment technology.

[0003] However, the cultivation of aerobic granular sludge requires stringent operating conditions, and numerous factors can affect its granulation process. This results in a long cultivation cycle, severely limiting its application. How to efficiently cultivate aerobic granular sludge during waste incineration leachate treatment is a pressing issue that needs to be addressed to advance the engineering application of this technology. Therefore, it is necessary to provide a new method for cultivating aerobic granular sludge, enabling its efficient cultivation. Summary of the Invention

[0004] The main objective of this invention is to provide an aerobic granular sludge cultivation device, cultivation method, and application, in order to solve the problem that the cultivation time for aerobic granular sludge is too long in the existing technology during the treatment of leachate from waste incineration.

[0005] To achieve the above objectives, according to one aspect of the present invention, an aerobic granular sludge cultivation device is provided. The cultivation device includes: an inlet unit comprising a water storage tank, and a raw water pump and an inlet water pump respectively connected to the water storage tank via a connecting channel; a reaction unit comprising a reactor, an aeration system, and a monitoring system; sludge inoculated within the reactor; a water distributor also provided at the bottom of the reactor, which is connected to the inlet water pump via a connecting channel; the aeration system comprising an annular aeration pipe and a blower, the annular aeration pipe being placed at the bottom of the reactor and connected to the blower via a connecting pipe; the monitoring system comprising a DO probe, a pH probe, and an ORP probe disposed inside the reactor; an outlet also provided on the side wall of the reactor; and a control unit communicatively connected to the raw water pump, the inlet water pump, the monitoring system, and the blower.

[0006] Furthermore, a first solenoid valve is installed at the water outlet, and the control unit communicates with the water outlet through the first solenoid valve; the bottom of the water storage tank has a sludge discharge port, and a second solenoid valve is installed at the sludge discharge port, and the control unit communicates with the sludge discharge port through the second solenoid valve.

[0007] Furthermore, the reactor is a columnar reactor; the height-to-diameter ratio of the reactor is ≥5, and more preferably 5 to 10.

[0008] Furthermore, an overflow port is provided at the top of the side wall of the reactor, and a sludge discharge port is provided at the bottom of the side wall of the reactor.

[0009] Furthermore, multiple sampling ports are spaced apart on the side wall of the reactor located between the overflow port and the sludge discharge port.

[0010] Furthermore, an exhaust port is provided at the top of the reactor.

[0011] Furthermore, a gas flow meter is also installed on the connecting pipe between the annular aeration pipe and the blower.

[0012] Furthermore, the reaction unit also includes a defoaming system, which includes a defoamer nozzle; wherein the defoamer nozzle is located at the top of the reactor, and a defoamer pump is also provided on the communication channel between the defoamer nozzle and the defoamer supply device; the defoamer pump is communicatively connected to the control unit.

[0013] Furthermore, a foam level gauge is installed at the top of the reactor, which is connected in communication with the control unit.

[0014] To achieve the above objectives, according to one aspect of the present invention, a method for cultivating aerobic granular sludge is provided. The aerobic granular sludge is cultivated using the aforementioned aerobic granular sludge cultivation device. The cultivation method includes a sludge activation stage and a sludge acclimation coupled with sludge granulation stage performed sequentially. The sludge activation stage includes a first activation stage, a second activation stage, and a third activation stage performed sequentially. The first activation stage includes: allowing diluted anaerobic effluent to enter the reaction unit through the influent unit to the working liquid level, and aerating the reactor by controlling the airflow rate of the aeration system through the control unit until the DO concentration in the reactor reaches DO. 初始值 While maintaining a constant airflow rate in the aeration system, when the DO concentration in the reactor changes from DO... 初始值 The DO concentration begins to decrease, which is considered the completion of the first activation stage; the second activation stage includes: adjusting the gas flow rate of the aeration system until the DO concentration in the reactor reaches the required level. 初始值 While maintaining a constant airflow rate in the aeration system, when DO 初始值 Rise to DO 激活值 and maintain DO for 1-5 hours. 激活值 If the reactor reaches the settling state, aeration is stopped, and some of the supernatant is discharged from the reactor, which is considered the completion of the second activation stage. The third activation stage includes: allowing the diluted anaerobic effluent to enter the reaction unit through the inlet unit to the working liquid level, and adjusting the air flow rate of the aeration system through the control unit to aerate the reactor to achieve the required DO concentration. 初始值 and maintain DO for 10–16 hours. 初始值 If the state is such that the air flow rate of the aeration system remains constant, aeration will continue until the DO concentration in the reactor changes from DO to DO. 初始值 Rise to DO 激活值 and maintain DO for 1-5 hours. 激活值 When the reactor reaches the settling state, aeration is stopped for settling. After settling, a portion of the supernatant is discharged from the reactor, which is considered the completion of the third activation stage. The sludge acclimation coupled with sludge granulation stage includes multiple coupled treatments performed sequentially. Each coupled treatment process is as follows: the coupled treatment liquid is introduced into the reaction unit through the influent unit to the working liquid level, and then the aeration system is turned on for 1250–1270 minutes of aeration. During the aeration process, the air flow rate of the aeration system is adjusted by the control unit to ensure that the DO concentration in the reactor reaches the required DO concentration. 初始值 Record the pH at this time. 初始值 And maintain a constant air flow rate in the aeration system, when the DO concentration in the reactor changes from DO... 初始值 Rise to DO 耦合值 pH value is determined by pH 初始值 Decrease to pH 耦合值 and maintain DO for 1-5 hours. 耦合值 and pH 耦合值When in the state, aeration is stopped and sedimentation and idleness are carried out in sequence. After idleness, part of the supernatant in the reactor is discharged, which is considered to complete one coupling treatment. The ammonia nitrogen concentration of the coupling treatment liquid used in each coupling treatment follows a gradient increasing pattern. In the first coupling treatment, the coupling treatment liquid used is the diluted anaerobic effluent with an ammonia nitrogen concentration between 50 and 100 mg / L. In the last coupling treatment, the coupling treatment liquid used is the undiluted anaerobic effluent with the original ammonia nitrogen concentration. The ammonia nitrogen concentration gradient range of the coupling treatment liquid used in the two adjacent coupling treatments is 100 to 200 mg / L.

[0015] Furthermore, DO 初始值 The concentration is 2–3 mg / L; preferably, DO 激活值 The concentration is 7.2–7.8 mg / L.

[0016] Furthermore, DO 耦合值 The concentration is 7.2–7.8 mg / L; preferably, the pH is... 初始值 The pH is 7.8–8.3; preferably, the pH is... 耦合值 It ranges from 6.3 to 6.5.

[0017] Furthermore, the COD of the anaerobic effluent is 2800–5000 mg / L; preferably, the ammonia nitrogen concentration of the anaerobic effluent is 1300–1900 mg / L; preferably, the mass concentration of the sludge inoculated in the reactor is 4–6 g / L.

[0018] Furthermore, after the final coupling treatment, the sludge acclimation coupled sludge granulation stage also includes multiple granule optimization treatments: each granule optimization treatment process is as follows: the undiluted anaerobic effluent is introduced into the reaction unit through the influent unit, and then the aeration system is turned on for 1250-1270 minutes of aeration, followed by sedimentation and idle period. After idle period, part of the supernatant in the reactor is discharged, which is considered as completing one granule optimization treatment; preferably, the sludge acclimation coupled sludge granulation stage also includes 13-14 granule optimization treatments.

[0019] According to another aspect of the present invention, an apparatus for cultivating the aforementioned aerobic granular sludge, or an application of the aforementioned method for cultivating aerobic granular sludge in the leachate treatment process of a waste incineration plant, is provided.

[0020] Based on the aforementioned specific device, this invention achieves a higher degree of automation, enabling it to significantly shorten the cultivation time of aerobic granular sludge while ensuring the cultivation quality of aerobic granular sludge, thus offering better prospects for industrial application. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0022] Figure 1 A schematic diagram of an aerobic granular sludge cultivation device according to one embodiment of the present invention is shown.

[0023] Figure 2 The image shows the morphology of the aerobic granular sludge after 28 days of operation of the aerobic granular sludge cultivation device in Embodiment 1 of the present invention.

[0024] Figure 3 The image shows the morphology of the aerobic granular sludge after 45 days of operation of the aerobic granular sludge cultivation device in Embodiment 1 of the present invention.

[0025] The above figures include the following reference numerals:

[0026] 1. Water inlet unit; 2. Reaction unit; 3. Control unit;

[0027] 11. Water storage tank; 12. Raw water pump; 13. Inlet water pump;

[0028] 21. Reactor; 22. Aeration system; 23. Monitoring system; 24. Defoaming system;

[0029] 210. Water distributor; 220. Annular aeration pipe; 221. Blower; 222. Gas flow meter; 230. DO probe; 231. pH probe; 232. ORP probe; 240. Defoamer nozzle; 241. Defoamer supply device; 242. Defoamer pump; 243. Foam level gauge. Detailed Implementation

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] As described in the background section of this invention, existing technologies suffer from the problem of excessively long cultivation times for aerobic granular sludge. To address this issue, this invention provides a cultivation apparatus, cultivation method, and applications for aerobic granular sludge. Figure 1As shown, the cultivation device includes an inlet unit 1, a reaction unit 2, and a control unit 3. The inlet unit 1 includes a water storage tank 11, and a raw water pump 12 and an inlet pump 13 connected to the water storage tank 11 via a connecting channel. The reaction unit 2 includes a reactor 21, an aeration system 22, and a monitoring system 23. The reactor 21 is filled with sludge to be cultivated. A water distributor 210 is also provided at the bottom of the reactor 21, which is connected to the inlet pump 13 via a connecting channel. The aeration system 22 includes an annular aeration pipe 220 and a blower 221. The annular aeration pipe 220 is placed at the bottom of the reactor 21 and is connected to the blower 221 via a connecting pipe. The monitoring system 23 includes a DO probe 230, a pH probe 231, and an ORP probe 232 installed inside the reactor 21. An outlet is also provided on the side wall of the reactor 21. The control unit 3 is communicatively connected to the raw water pump 12, the inlet pump 13, the monitoring system 23, and the blower 221.

[0032] Based on the aforementioned specific device, this invention has a higher degree of automation and can monitor and provide feedback on the DO concentration, pH value, and ORP value in reactor 21 at any time. This achieves the beneficial effect of significantly shortening the cultivation time of aerobic granular sludge while ensuring the cultivation quality of aerobic granular sludge, thus showing better prospects for industrial application.

[0033] Specifically, in one embodiment, the aerobic granular sludge is subjected to sludge activation treatment and sludge acclimation coupled with sludge granulation treatment in sequence using the above-mentioned device. The sludge activation stage includes a first activation stage, a second activation stage, and a third activation stage performed sequentially. In the first activation stage: the diluted anaerobic effluent is pumped into the storage tank 11 through the raw water pump 12, and then into the reactor 21 through the inlet pump 13. The air flow rate of the aeration system 22 is adjusted by the control unit 3 until the DO concentration in the reactor 21 reaches the required level. 初始值 After running for a certain period of time, while maintaining a constant air flow rate in aeration system 22, when the DO concentration in reactor 21 changes from DO... 初始值 The DO concentration begins to decrease, which is considered the completion of the first activation stage. In the second activation stage: the DO concentration in reactor 21 is maintained at the DO level by adjusting the gas flow rate of aeration system 22. 初始值 To maintain a constant gas flow rate in aeration system 22, when DO 初始值 Rise to DO 激活值 and maintain DO for 1-5 hours. 激活值 If the anaerobic effluent reaches the settling state, aeration is stopped, sedimentation occurs, and a portion of the supernatant in reactor 21 is discharged, thus completing the second activation stage. In the third activation stage: the diluted anaerobic effluent enters reaction unit 2 through inlet unit 1, and aeration is performed by controlling the airflow rate of aeration system 22 via control unit 3 to achieve the required DO concentration in reactor 21. 初始值At this time, the air flow rate of aeration system 22 is kept constant. When the DO concentration in reactor 21 changes from DO... 初始值 Rise to DO 激活值 and maintain DO for 1-5 hours. 激活值 When the state is reached, aeration is stopped and sedimentation takes place. After sedimentation, part of the supernatant in reactor 21 is discharged through the outlet, which is considered to be the completion of the third activation stage.

[0034] The sludge acclimation coupled with sludge granulation stage includes multiple sequential coupled treatments. Each coupled treatment process involves: the coupled treatment liquid entering the reaction unit 2 through the influent unit 1, followed by starting the aeration system 22 for 1250–1270 minutes of aeration. During aeration, the air flow rate of the aeration system 22 is adjusted by the control unit 3 to ensure that the DO concentration in the reactor 21 reaches the required DO concentration. 初始值 Record the pH at this time. 初始值 And maintain the air flow rate of aeration system 22 constant, when the DO concentration in reactor 21 changes from DO 初始值 Rise to DO 耦合值 pH value is determined by pH 初始值 Decrease to pH 耦合值 and maintain DO for 1-5 hours. 耦合值 and pH 耦合值 When in the desired state, aeration is stopped, and sedimentation and idleness are performed sequentially. After idleness, a portion of the coupled treatment liquid is discharged from reactor 21, which is considered as completing one coupled treatment cycle. The ammonia nitrogen concentration of the coupled treatment liquid used in each coupled treatment cycle follows a gradient increasing pattern. The coupled treatment liquid used in the first coupled treatment cycle is diluted anaerobic effluent with an ammonia nitrogen concentration between 50 and 100 mg / L. The coupled treatment liquid used in the last coupled treatment cycle is undiluted anaerobic effluent with the original ammonia nitrogen concentration. The ammonia nitrogen concentration gradient range between adjacent coupled treatment cycles is 100–200 mg / L.

[0035] In a preferred embodiment, a first solenoid valve is provided at the water outlet, and the control unit 3 is communicatively connected to the water outlet through the first solenoid valve. Based on this, the beneficial effect of automatic drainage can be achieved, resulting in a higher degree of automation.

[0036] To further improve system operational stability, in a preferred embodiment, the bottom of the water storage tank 11 has a sludge discharge port, which is communicatively connected to the control unit 3 via a second solenoid valve. Based on this, sediment at the bottom of the water storage tank 11 is emptied via the second solenoid valve to prevent tank blockage and ensure normal equipment operation.

[0037] To further improve the cultivation efficiency of aerobic granular sludge, reactor 21 is preferably a columnar reactor with a height-to-diameter ratio ≥5, and more preferably 5-10.

[0038] To further prevent overflow and other problems that may be caused by control unit failure during operation, it is preferable that the top of the side wall of reactor 21 is provided with an overflow port. To further improve the stability of system operation, it is preferable that the bottom of the side wall of reactor 21 is provided with a sludge discharge port.

[0039] In a preferred embodiment, multiple sampling ports are spaced apart on the sidewall between the overflow port and the sludge discharge port, preferably 5 to 7 sampling ports, with the spacing between each sampling port between 0.225 and 0.3 m. This allows the present invention to sample liquid from different locations at any time for testing.

[0040] In order to further effectively control the aeration rate to control the DO concentration in the reactor 21, in a preferred embodiment, a gas flow meter 222 is also provided on the connecting pipe between the annular aeration pipe 220 and the blower 221.

[0041] In a preferred embodiment, the reaction unit 2 further includes a defoaming system 24, which includes a defoamer nozzle 240 and a defoamer supply device 241 connected to it via a communication channel. The defoamer nozzle 240 is located at the top of the reactor 21, and a defoamer pump 242 is also installed on the communication channel between the defoamer nozzle 240 and the defoamer supply device 241. The defoamer pump 242 is communicatively connected to the control unit 3. A foam level gauge 243 is also installed at the top of the reactor 21, and it is communicatively connected to the control unit 3. Since foam is generated during the aeration process of leachate from the waste incineration plant, the foam level gauge 243 detects the foam height. When the foam rises to a certain height, the defoaming system 24 performs defoaming treatment. The defoaming system stops operating once the foam dissipates. Specifically, during this operation, those skilled in the art can first set a value in the foam level gauge. When the foam rises to the height of this value, the foam level gauge sends a feedback signal to the control unit 3. The control unit controls the defoaming pump to work, drawing defoaming agent from the defoaming agent supply device and spraying it into the reactor through the defoaming nozzle. Once the foam dissipates and the foam height is lower than the set value, the level gauge sends a feedback signal to the control unit, which then controls the defoaming pump to stop working.

[0042] The present invention also provides a method for cultivating aerobic granular sludge, wherein the aforementioned aerobic granular sludge cultivation device is used to cultivate aerobic granular sludge, and the cultivation method includes a sludge activation stage and a sludge acclimatization coupled with a sludge granulation stage performed sequentially.

[0043] The sludge activation stage includes a first activation stage, a second activation stage, and a third activation stage performed sequentially:

[0044] The first activation stage includes: allowing the diluted anaerobic effluent to enter the reaction unit 2 through the inlet unit 1 to the working level, and regulating the air flow rate of the aeration system 22 through the control unit 3 to perform aeration until the DO concentration in the reactor 21 reaches the required level. 初始值 After running for a certain period of time, while maintaining a constant air flow rate in aeration system 22, when the DO concentration in reactor 21 changes from DO... 初始值 The descent begins, which is considered the completion of the first activation phase;

[0045] The second activation stage includes: adjusting the gas flow rate of the aeration system 22 until the DO concentration in the reactor 21 reaches the DO level. 初始值 After running for a certain period of time, while maintaining the air flow rate of aeration system 22 at a constant value, when DO 初始值 Rise to DO 激活值 and maintain DO for 1-5 hours. 激活值 If the state is reached, aeration is stopped, and after settling, part of the supernatant in reactor 21 is discharged, which is considered to be the completion of the second activation stage.

[0046] The third activation stage includes: continuing to allow the diluted anaerobic effluent to enter the reaction unit 2 through the inlet unit 1 to the working level, and adjusting the air flow rate of the aeration system 22 through the control unit 3 to aerate the water so that the DO concentration in the reactor 21 reaches the required level. 初始值 At this time, the air flow rate of aeration system 22 is kept constant. When the DO concentration in reactor 21 changes from DO... 初始值 Rise to DO 激活值 and maintain DO for 1-5 hours. 激活值 When the state is reached, aeration is stopped and sedimentation is carried out. After sedimentation, part of the supernatant in reactor 21 is discharged, which is considered to be the completion of the third activation stage.

[0047] The sludge acclimation coupled with the sludge granulation stage includes multiple coupled treatments performed sequentially.

[0048] Each coupling treatment process is as follows: the coupling treatment solution enters the reaction unit 2 through the inlet unit 1 to the working liquid level, and then the aeration system 22 is turned on for 1250-1270 minutes of aeration. During the aeration process, the air flow rate of the aeration system 22 is adjusted by the control unit 3 to ensure that the DO concentration in the reactor 21 reaches the required DO concentration. 初始值 Record the pH at this time. 初始值 And maintain the air flow rate of aeration system 22 constant, when the DO concentration in reactor 21 changes from DO 初始值 Rise to DO 耦合值 pH value is determined by pH 初始值 Decrease to pH 耦合值 and maintain DO for 1-5 hours. 耦合值 and pH 耦合值When the state is reached, aeration is stopped and sedimentation and idleness are carried out in sequence. After idleness, part of the supernatant in reactor 21 is discharged, which is considered to complete one coupling process.

[0049] The ammonia nitrogen concentration of the coupling treatment solution used in each coupling treatment follows a gradient increasing pattern. In the first coupling treatment, the coupling treatment solution used was diluted anaerobic effluent with an ammonia nitrogen concentration between 50 and 100 mg / L. In the last coupling treatment, the coupling treatment solution used was undiluted anaerobic effluent with the original ammonia nitrogen concentration. The gradient range of ammonia nitrogen concentration of the coupling treatment solution used in the two adjacent coupling treatments was 100 to 200 mg / L.

[0050] Based on the reasons mentioned above, this invention can significantly shorten the cultivation time of aerobic granular sludge while ensuring the cultivation quality of aerobic granular sludge, making it more promising for industrial application.

[0051] In a preferred embodiment, during the sludge activation stage, after the third activation stage is completed, those skilled in the art may repeat the above-mentioned sludge activation stage 1 to 2 more times to further improve the sludge activation effect.

[0052] In a preferred embodiment, during the sludge acclimation coupled with sludge granulation stage, the time for the coupling treatment liquid to be fed into the reactor 21 during each coupling treatment process is 60-120 min, followed by an aeration time of 1260-1980 min, an idle time of 20-40 min, and a time for discharging part of the supernatant from the reactor 21 after the idle time of 8-12 min.

[0053] In a preferred embodiment, DO 初始值 2–3 mg / L; DO 激活值 The concentration was 7.2–7.8 mg / L; DO 耦合值 The concentration was 7.2–7.8 mg / L; pH 初始值 The pH ranges from 7.8 to 8.3. 耦合值 It ranges from 6.3 to 6.5.

[0054] In a preferred embodiment, the COD of the anaerobic effluent is 2800–5000 mg / L; the ammonia nitrogen concentration of the anaerobic effluent is 1300–1900 mg / L; and the mass concentration of the sludge to be cultured in reactor 21 is 4–6 g / L.

[0055] In a preferred embodiment, the volume of supernatant discharged each time in the above-mentioned sludge activation stage and sludge acclimatization coupled sludge granulation stage is 50% of the volume of reactor 21.

[0056] In a preferred embodiment, after the final coupling treatment, the sludge acclimation coupled sludge granulation stage further includes multiple granulation optimization treatments: each granulation optimization treatment process is as follows: the undiluted anaerobic effluent is introduced into the reaction unit 2 through the inlet unit 1, and then the aeration system 22 is turned on for 1250-1270 minutes of aeration, followed by sedimentation and idleness. After idleness, part of the supernatant in the reactor 21 is discharged, which is considered as completing one granulation optimization treatment; preferably, the sludge acclimation coupled sludge granulation stage further includes 13-14 granulation optimization treatments.

[0057] The present invention also provides a cultivation device for the aforementioned aerobic granular sludge, and the application of the aforementioned cultivation method for aerobic granular sludge in the leachate treatment process of a waste incineration plant.

[0058] Based on the reasons mentioned above, this invention can efficiently cultivate aerobic granular sludge in the leachate treatment process of waste incineration plants, thereby improving the treatment effect and showing better prospects for industrial application.

[0059] The present application will be further described in detail below with reference to specific embodiments, which should not be construed as limiting the scope of protection claimed in the present application.

[0060] Example 1

[0061] The wastewater comes from the effluent of the anaerobic reactor of a waste incineration plant. Its main water quality indicators are as follows: pH value: 7.8-8.3, COD: 3500mg / L, ammonia nitrogen concentration: 1800mg / L.

[0062] use Figure 1 The aerobic granular sludge is cultured using the cultivation device shown.

[0063] The height-to-diameter ratio is 6. Seven sampling ports are spaced 0.225 m apart on the reactor sidewall. The mass concentration of the inoculated sludge in the reactor is 5.8 g / L.

[0064] The cultivation method is as follows:

[0065] The effluent from the anaerobic reactor (i.e., anaerobic effluent) was diluted 20 times before being fed into the reactor. After dilution, the COD concentration of the influent was 170 mg / L, the ammonia nitrogen concentration was 90 mg / L, and the pH value was 7.9–8.1.

[0066] During the sludge activation stage:

[0067] In the first activation stage: Anaerobic reactor effluent diluted 20 times is introduced into the storage tank 11 via the inlet controller 12, and then into reactor 21 to the working level via the outlet controller 13. Aeration is achieved by regulating the air flow rate of the aeration system 22 via the control unit 3 to ensure the DO concentration in reactor 21 reaches the required DO level.初始值 (2.5~3.0mg / L), at this time the air flow rate of aeration system 22 is kept constant. When the DO concentration in reactor 21 changes from DO 初始值 The first activation phase is considered complete when the concentration of the drug decreases from 2.5–3.0 mg / L to 2–2.1 mg / L. The total duration of this phase is 72 hours.

[0068] In the second activation phase: gradually increase the air flow rate of aeration system 22 for aeration until it stabilizes and the DO concentration in reactor 21 is maintained at DO. 初始值 (2.5~3.0mg / L), after running for a certain period of time, DO 初始值 (2.5~3.0mg / L) rises to DO 激活值 When the concentration of the supernatant in reactor 21 is maintained at 7.2–7.8 mg / L for 3 hours, aeration is stopped to allow sedimentation. After sedimentation, half the volume of supernatant in reactor 21 is discharged, completing the second activation stage. The total running time of this stage is 24 hours.

[0069] In the third activation stage: Anaerobic effluent diluted 20 times continues to enter reaction unit 2 through inlet unit 1 until the working liquid level is reached. Aeration is achieved by controlling the air flow rate of aeration system 22 via control unit 3 to ensure the DO concentration in reactor 21 reaches the required DO level. 初始值 During the initial aeration stage, the DO concentration in reactor 21 will be slightly higher than that in reactor 21. 初始值 However, it will gradually decrease to DO. 初始值 And it remained basically stable for 15 hours; at this time, the air flow rate of aeration system 22 was kept constant and aeration continued. When the DO concentration in reactor 21 decreased from DO 初始值 Rise to DO 激活值 and maintain DO for 4 hours 激活值 When the temperature remains unchanged, aeration is stopped and sedimentation is carried out. After sedimentation, half the volume of supernatant in reactor 21 is discharged, completing the third activation stage. The total running time of this stage is 24 hours.

[0070] Repeat the third activation phase twice more, each time for 24 hours, for a total runtime of 48 hours (7 days).

[0071] After 7 days (d), the system enters the sludge acclimatization coupled with sludge granulation stage.

[0072] In the sludge acclimation coupled with sludge granulation stage:

[0073] Day 8: First, the coupling treatment solution (anaerobic effluent diluted 20 times, ammonia nitrogen concentration of 90 mg / L) is introduced into reaction unit 2 through inlet unit 1. The inlet time of the coupling treatment solution is 120 min, and the inlet flow rate is 0.53 L / min. Then, aeration system 22 is turned on for 1260 min of aeration. During the aeration process, the air flow rate of aeration system 22 is adjusted by control unit 3 to ensure that the DO concentration in reactor 21 reaches the required DO concentration. 初始值 Record the pH at this time. 初始值 The concentration is (7.9~8.1), at which point the air flow rate of aeration system 22 remains constant. When the DO concentration in reactor 21 changes from DO... 初始值 Rise to DO 耦合值 (Approximately 7.5 mg / L), pH value is determined by pH 初始值 (7.9–8.1) Decrease to pH 耦合值 (Around 6.4), and maintain DO for 4 hours. 耦合值 and pH 耦合值 If the temperature remains unchanged, stop aeration. Then, allow the mixture to settle for 30 minutes and rest for 40 minutes. After resting, continuously discharge 50% of the liquid volume from reactor 21.

[0074] On day 9, the anaerobic effluent diluted 5.20 times (ammonia nitrogen concentration of approximately 290 mg / L) was used as the coupling treatment solution, and the operation pattern of day 8 was repeated.

[0075] On day 10, the anaerobic effluent diluted 3.67 times (ammonia nitrogen concentration of approximately 490 mg / L) was used as the coupling treatment solution, and the operation pattern of day 8 was repeated.

[0076] On day 11, the anaerobic effluent diluted 2.6 times (ammonia nitrogen concentration of approximately 690 mg / L) was used as the coupling treatment solution, and the operation pattern of day 8 was repeated.

[0077] On day 12, anaerobic effluent diluted 2.02 times (ammonia nitrogen concentration of approximately 890 mg / L) was used as the coupling treatment solution, and the operation pattern of day 8 was repeated.

[0078] Until day 13, anaerobic effluent diluted 1.65 times (ammonia nitrogen concentration approximately 1090 mg / L) was used as the coupling treatment solution. Within 1260 min of aeration, the regular changes in DO and pH observed on day 8 were not observed. The solution was allowed to settle, then left idle, and 50% of the liquid volume was discharged. On day 14, anaerobic effluent diluted 1.65 times (ammonia nitrogen concentration approximately 1090 mg / L) was used again as the coupling treatment solution. After 720 min of aeration, the regular changes in DO and pH appeared. The solution was then allowed to settle, left idle, and 50% of the liquid volume was discharged. On day 15, anaerobic effluent diluted 1.65 times (ammonia nitrogen concentration approximately 1090 mg / L) was used again as the coupling treatment solution, and the above operation was repeated. After 1980 min of aeration, regular changes in DO and pH appeared. The solution was then allowed to settle, left idle, and 50% of the liquid volume was discharged. On day 16, the anaerobic effluent diluted 1.65 times (ammonia nitrogen concentration of about 1090 mg / L) was used as the coupling treatment liquid to repeat the above operation. Regular changes in DO and pH were observed within 1260 min of aeration. Then, the solution was allowed to settle, idled, and 50% of the volume of liquid was discharged.

[0079] From day 17 to day 20, anaerobic effluent diluted 1.40 times (ammonia nitrogen concentration of approximately 1290 mg / L) was used as the coupling treatment solution, and the operation pattern of days 13 to 16 was repeated.

[0080] From day 21 to day 24, anaerobic effluent diluted 1.21 times (ammonia nitrogen concentration of approximately 1490 mg / L) was used as the coupling treatment solution, and the operation pattern of days 13 to 16 was repeated.

[0081] From day 25 to day 28, anaerobic effluent with an ammonia nitrogen concentration of 1690 mg / L was used as the coupling treatment liquid, and the operation pattern of days 13 to 16 was repeated.

[0082] From day 29 to day 32, undiluted anaerobic effluent (ammonia nitrogen concentration of approximately 1800 mg / L) was used as the coupling treatment solution, and the operating pattern of days 13 to 16 was repeated.

[0083] On day 33, undiluted anaerobic effluent (ammonia nitrogen concentration approximately 1800 mg / L) was first introduced into reaction unit 2 through inlet unit 1 until the working liquid level was reached. The coupling treatment liquid inlet time was 120 min, and the inlet flow rate was 0.53 L / min. Then, aeration system 22 was turned on for 1260 min of aeration, followed by sedimentation, idle time, and discharge of 50% of the liquid volume.

[0084] The process of day 33 was repeated from day 34 to day 42.

[0085] During the process from day 8 to day 42, while increasing the concentration of ammonia nitrogen in the coupled treatment liquid, the settling time was gradually shortened and the idle time increased, at a rate of 5 minutes per 7 days (i.e., the settling time was reduced by 5 minutes every 7 days, and the idle time was increased by 5 minutes every 7 days). The settling time was 30 minutes and the idle time was 40 minutes from day 8 to day 14; the settling time was 25 minutes and the idle time was 45 minutes from day 15 to day 21; the settling time was 20 minutes and the idle time was 50 minutes from day 22 to day 28; the settling time was 15 minutes and the idle time was 55 minutes from day 29 to day 35; and the settling time was 10 minutes and the idle time was 60 minutes from day 36 to day 42.

[0086] On day 43, the coupling treatment solution (undiluted anaerobic effluent with an ammonia nitrogen concentration of 1800 mg / L) was first introduced into reaction unit 2 through inlet unit 1. The inlet time was 120 min, and the inlet flow rate was 0.53 L / min. Then, aeration system 22 was turned on for 1260 min of aeration. After that, the mixture was allowed to settle for 10 min, idle for 60 min, and drained for 10 min (drainage flow rate was 6.36 L / min).

[0087] The process of day 43 was repeated from day 44 to day 45.

[0088] During the above cultivation process, the COD and ammonia nitrogen concentrations of the feed liquid in the reactor can be measured by sampling through the sampling port to detect and verify the pollutant removal effect of the reactor and the cultivation status of aerobic granular sludge.

[0089] During the sludge activation stage, after 24 hours, the effluent COD was measured at 160 mg / L and the ammonia nitrogen concentration was 81 mg / L. Considering the adsorption effect of sludge and the dilution effect of inoculated sludge, this indicates that the sludge was not activated after 24 hours. After 168 hours, the effluent COD and ammonia nitrogen concentrations were measured at 115 mg / L and 41 mg / L, respectively, indicating that the sludge had been activated at this point.

[0090] During the sludge acclimation coupled with sludge granulation stage, granular sludge samples were taken on day 28 for characterization, indicating that granulation had not yet been fully achieved. Figure 2 ), while at 45 days, it basically achieves complete granulation ( Figure 3 This proves that the granular sludge cultivation has been completed.

[0091] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for cultivating aerobic granular sludge, characterized in that, The aerobic granular sludge is cultivated using an aerobic granular sludge cultivation device, the cultivation device comprising: The water inlet unit (1) includes a water storage tank (11), and a raw water pump (12) and an inlet water pump (13) connected to the water storage tank (11) respectively through a connecting channel. The reaction unit (2) includes a reactor (21), an aeration system (22), and a monitoring system (23); sludge is inoculated inside the reactor (21); a water distributor (210) is also provided at the bottom of the reactor (21), which is connected to the inlet pump (13) through a connecting channel; the aeration system (22) includes an annular aeration pipe (220) and a blower (221), the annular aeration pipe (220) is placed at the bottom of the reactor (21) and connected to the blower (221) through a connecting pipe; the monitoring system (23) includes a DO probe (230), a pH probe (231), and an ORP probe (232) installed inside the reactor (21); an outlet is also provided on the side wall of the reactor (21); The control unit (3) is communicatively connected to the raw water pump (12), the inlet water pump (13), the monitoring system (23), and the blower (221); The cultivation method includes a sludge activation stage and a sludge acclimatization coupled with a sludge granulation stage performed sequentially. The sludge activation stage includes a first activation stage, a second activation stage, and a third activation stage performed sequentially: The first activation stage includes: allowing the diluted anaerobic effluent to enter the reaction unit (2) through the inlet unit (1) to the working level, and regulating the air flow rate of the aeration system (22) through the control unit (3) to perform aeration until the DO concentration in the reactor (21) reaches DO. 初始值 While maintaining the air flow rate of the aeration system (22) constant, when the DO concentration in the reactor (21) changes from the DO concentration... 初始值 The descent begins, which is considered the completion of the first activation phase; The second activation phase includes: adjusting the gas flow rate of the aeration system (22) until the DO concentration in the reactor (21) reaches DO 初始值 While maintaining the air flow rate of the aeration system (22) constant, when the DO 初始值 Rise to DO 激活值 and maintain the DO for 1-5 hours. 激活值 If the state is reached, aeration is stopped, and after settling, part of the supernatant in the reactor (21) is discharged, which is considered to be the completion of the second activation stage; The third activation stage includes: continuing to allow the diluted anaerobic effluent to enter the reaction unit (2) through the inlet unit (1) to the working level, and adjusting the air flow rate of the aeration system (22) through the control unit (3) to aerate the reactor (21) so that the DO concentration reaches the required level. 初始值 and maintain the DO for 10-16 hours. 初始值 If the state is such that the air flow rate of the aeration system (22) remains constant, aeration will continue. When the DO concentration in the reactor (21) changes from the DO concentration... 初始值 Increase to the DO 激活值 and maintain the DO for 1-5 hours. 激活值 When the state is reached, aeration is stopped and sedimentation is carried out. After sedimentation, part of the supernatant in the reactor (21) is discharged, which is considered to be the completion of the third activation stage. The sludge acclimatization coupled sludge granulation stage includes multiple coupled treatments performed sequentially. Each coupling process is as follows: the coupling treatment liquid is introduced into the reaction unit (2) through the inlet unit (1) to the working level, and then the aeration system (22) is turned on for 1250~1270 minutes of aeration. During the aeration process, the air flow rate of the aeration system (22) is adjusted by the control unit (3) to make the DO concentration in the reactor (21) reach the specified DO concentration. 初始值 Record the pH at this time. 初始值 And maintain the air flow rate of the aeration system (22) constant, when the DO concentration in the reactor (21) is changed from the DO 初始值 Rise to DO 耦合值 The pH value is determined by the pH value. 初始值 Decrease to pH 耦合值 and maintain the DO for 1-5 hours. 耦合值 and the pH 耦合值 When the state is reached, aeration is stopped and sedimentation and idleness are carried out in sequence. After idleness, part of the supernatant in the reactor (21) is discharged, which is considered to be the completion of one coupling process. The ammonia nitrogen concentration of the coupling treatment solution used in each coupling treatment follows a gradient increasing pattern. In the first coupling treatment, the coupling treatment solution used is diluted anaerobic effluent with an ammonia nitrogen concentration between 50 and 100 mg / L. In the last coupling treatment, the coupling treatment solution used is undiluted anaerobic effluent with the original ammonia nitrogen concentration. The gradient range of ammonia nitrogen concentration of the coupling treatment solution used in two adjacent coupling treatments is 100 to 200 mg / L.

2. The method for cultivating aerobic granular sludge according to claim 1, characterized in that, A first solenoid valve is provided at the water outlet, and the control unit (3) is communicatively connected to the water outlet through the first solenoid valve; The bottom of the water storage tank (11) has a sludge discharge port, and a second solenoid valve is provided at the sludge discharge port. The control unit (3) is connected to the sludge discharge port through the second solenoid valve.

3. The method for cultivating aerobic granular sludge according to claim 1 or 2, characterized in that, The reactor (21) is a columnar reactor; the height-to-diameter ratio of the reactor (21) is ≥5.

4. The method for cultivating aerobic granular sludge according to claim 1 or 2, characterized in that, The reactor (21) has an overflow port at the top of its side wall and a sludge discharge port at the bottom of its side wall.

5. The method for cultivating aerobic granular sludge according to claim 4, characterized in that, The reactor (21) is provided with multiple sampling ports at intervals on the side wall between the overflow port and the sludge discharge port.

6. The method for cultivating aerobic granular sludge according to claim 1 or 2, characterized in that, The reactor (21) is provided with an exhaust port at the top.

7. The method for cultivating aerobic granular sludge according to claim 1 or 2, characterized in that, A gas flow meter (222) is also installed on the connecting pipe between the annular aeration pipe (220) and the blower (221).

8. The method for cultivating aerobic granular sludge according to claim 1, characterized in that, The reaction unit (2) further includes a defoaming system (24), which includes a defoamer nozzle (240); wherein, The defoamer nozzle (240) is located on the top of the reactor (21), and a defoamer pump (242) is also provided on the communication channel between the defoamer nozzle (240) and the defoamer supply device (241). The defoaming pump (242) is communicatively connected to the control unit (3).

9. The method for cultivating aerobic granular sludge according to claim 8, characterized in that, A foam level gauge (243) is also installed on the top of the reactor (21), which is communicatively connected to the control unit (3).

10. The method for cultivating aerobic granular sludge according to claim 1, characterized in that, The DO 初始值 It is 2~3 mg / L.

11. The method for cultivating aerobic granular sludge according to claim 1, characterized in that, The DO 激活值 The concentration is 7.2~7.8 mg / L.

12. The method for cultivating aerobic granular sludge according to claim 1, characterized in that, The DO 耦合值 The concentration is 7.2~7.8 mg / L.

13. The method for cultivating aerobic granular sludge according to claim 1, characterized in that, The pH 初始值 It ranges from 7.8 to 8.

3.

14. The method for cultivating aerobic granular sludge according to claim 1, characterized in that, The pH 耦合值 It is 6.3~6.

5.

15. The method for cultivating aerobic granular sludge according to claim 1, characterized in that, The COD of the anaerobic effluent is 2800~5000 mg / L.

16. The method for cultivating aerobic granular sludge according to claim 1, characterized in that, The ammonia nitrogen concentration in the anaerobic effluent is 1300~1900 mg / L.

17. The method for cultivating aerobic granular sludge according to claim 1, characterized in that, The mass concentration of the inoculated sludge in the reactor (21) is 4~6 g / L.

18. The method for cultivating aerobic granular sludge according to claim 1, characterized in that, Following the final coupling process, the sludge acclimation coupled sludge granulation stage also includes multiple granulation optimization processes: Each particle optimization process is as follows: the undiluted anaerobic effluent is introduced into the reaction unit (2) through the inlet unit (1) to the working level, and then the aeration system (22) is turned on for 1250~1270 min of aeration. Then, sedimentation and idleness are carried out. After idleness, part of the supernatant in the reactor (21) is discharged, which is considered as completing one particle optimization process.

19. The method for cultivating aerobic granular sludge according to claim 18, characterized in that, The sludge acclimatization coupled with sludge granulation stage also includes 13 to 14 granulation optimization treatments.

20. The application of the method for cultivating aerobic granular sludge according to any one of claims 1 to 19 in the leachate treatment process of a waste incineration plant.

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