Aerobic granular sludge sewage treatment process applied to continuous flow activated sludge process

Abstract

The invention belongs to the technical field of sludge treatment, and particularly relates to an aerobic granular sludge sewage treatment process applied to a continuous flow activated sludge process. A pelletizing agent is added into a granular sludge incubator, so that the pelletizing agent is in targeted combination with filamentous bacteria in activated sludge to form granular sludge, the granular sludge and flocculent sludge are effectively separated through a cyclone separation system, the granular sludge continuously flows back into a biochemical system, and the flocculent sludge is discharged into a sludge concentration tank or a sludge storage tank for dehydration treatment. According to the present invention, the AGS is rapidly cultured and the stable operation is maintained in the current or new continuous flow activated sludge process, such that the treatment water amount of the traditional continuous flow sewage treatment process can be subjected to in-situ capacity expansion, the impact load resistance can be enhanced, the addition amount of the phosphorus and nitrogen removal agent can be reduced, and the in-situ excess sludge can be reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of sludge treatment, and in particular relates to an aerobic granular sludge sewage treatment process applied to a continuous flow activated sludge method. Background Art

[0002] Aerobic Granular Sludeg (AGS) is a dense self-immobilized microbial aggregate. Compared with traditional flocculent activated sludge, AGS has obvious advantages in improving mud-water separation effect, reactor unit volume processing capacity, shock load resistance, excess sludge reduction, simultaneous nitrogen and phosphorus removal, and removal of difficult-to-degrade organic matter.

[0003] The wastewater treatment technology using aerobic granular sludge is an efficient biological wastewater treatment method. It improves the wastewater treatment efficiency by forming a compact microbial aggregate - granular sludge. However, in practical applications, aerobic granular sludge wastewater treatment technology also faces some difficulties and challenges, mainly including the following aspects:

[0004] 1. Granulation startup stage. Difficulty: It may take a long time to form stable granular sludge in the initial stage, and this process is very sensitive to environmental conditions. Influencing factors: Including influent water quality, operating parameters (such as aeration intensity, hydraulic retention time HRT, sludge retention time SRT, etc.), reactor design and startup strategy, etc.

[0005] 2. Particle stability. Disintegration and dispersion: Granular sludge may disintegrate or disperse due to factors such as excessive mechanical shear force, fluctuations in organic load, and impact of toxic substances, resulting in a decrease in treatment effect. Flotation problem: In some cases, granular sludge may float due to reduced density, affecting the solid-liquid separation effect.

[0006] 3. Balance of nutrients. Nitrogen and phosphorus requirements: In order to maintain good particle structure and activity, it is necessary to ensure the appropriate amount of nutrients such as nitrogen and phosphorus. If these elements are insufficient or excessive, they may lead to poor particle morphology or dysfunction. Trace elements: Some trace metal ions (such as iron, zinc, copper, etc.) are essential for the growth of specific microbial communities, and their lack will affect the performance of granular sludge.

[0007] 4. Influence of toxic substances. Inhibition: Industrial wastewater often contains various toxic and harmful substances, such as heavy metals, difficult-to-degrade organic matter, etc., which will inhibit microorganisms, thereby affecting the stability and treatment efficiency of granular sludge. Adaptability: Different types of microorganisms have different tolerance to toxicity, which may lead to changes in the structure of the microbial community and thus affect the overall performance of granular sludge.

[0008] 5. Influence of temperature and pH value. Temperature sensitivity: The optimal growth temperature range of most microorganisms is 20-35℃. Too high or too low temperature will affect their metabolic activities, thereby affecting the treatment efficiency of granular sludge. pH value control: The appropriate pH value is very important for maintaining microbial activity and particle structure. Too high or too low pH value will lead to reduced microbial activity or even death, affecting the stability and treatment effect of granular sludge.

[0009] Moreover, the existing AGS process is only used in the sequencing batch reactor (SBR) activated sludge process. The sequencing batch reactor requires shutdown for transformation or new construction, and uses selective pressure drive to promote the formation of AGS. It has the disadvantages of long startup cycle, complex control mechanism, long debugging cycle, etc., and cannot be applied to most of the existing continuous flow activated sludge processes. Summary of the invention

[0010] The first object of the present invention is to provide a method for rapidly culturing AGS in an existing or newly built continuous flow activated sludge process.

[0011] The second purpose of the present invention is to realize the long-term stable operation of the continuous flow aerobic granular sludge AGS on the basis of the first purpose, so as to recover most of the cultured and domesticated granular sludge in daily operation.

[0012] The third object of the present invention is to provide a method for rapidly cultivating AGS and maintaining stable operation in the existing or newly built continuous flow activated sludge process. This method can expand the water treatment capacity of the traditional continuous flow sewage treatment process in situ, enhance the resistance to shock loads, reduce the amount of phosphorus and nitrogen removal agents added, and reduce the amount of residual sludge in situ.

[0013] In order to achieve the above object, the present invention provides the following technical solutions:

[0014] An aerobic granular sludge sewage treatment process applied to a continuous flow activated sludge method. In the sewage treatment process, during the continuous operation of the continuous flow activated sludge process, a spheroidizing agent is added into a granular sludge incubator to make it bind with filamentous bacteria in the activated sludge in a targeted manner to form granular sludge, and a cyclone separation system is used to effectively separate the granular sludge and flocculent sludge. The granular sludge is continuously returned to the biochemical system, and the flocculent sludge is discharged into a sludge thickening tank or a sludge storage tank for dehydration treatment.

[0015] Furthermore, the continuous flow activated sludge process comprises: conventional A 2 O process, improved A 2 O process, oxidation ditch process, MSBR process, Bardenpho process.

[0016] The continuous flow activated sludge process described in the present invention does not include: MBBR process, MBR process and other activated sludge processes with added fillers or carriers.

[0017] Furthermore, the system equipment is centrally skid-mounted and externally arranged between the biochemical system and the sludge return system, without changing the current or planned operating parameters of the sewage treatment process.

[0018] Furthermore, the spheronizing agent is a modified inert porous carrier with a particle size of 80 to 100 meshes.

[0019] Furthermore, the minimum separation particle size of the granular sludge and flocculent sludge cyclone separation system is 10 to 40 microns, the inlet end of the cyclone separator is connected to the residual sludge feed pipe, and the cyclone separator includes a top flow port and a bottom flow port. The top flow port is a flocculent sludge discharge port, which is discharged to a sludge thickening tank or a sludge storage tank, and the bottom flow port is a granular sludge return port, which is returned to the front end of the aerobic zone of the biochemical system.

[0020] Furthermore, the equivalent particle size of AGS is greater than 0.2 mm.

[0021] Furthermore, the total dosage of the spheroidizing agent is 0.5‰ to 1.0‰ of the total volume of the biochemical pool.

[0022] The spheroidizing agent is also called granular sludge promoter, referred to as GSP (Granular Sludge Promoter), which is a hydrophilic inert microcarrier auxiliary agent mainly composed of modified resin and carbon base that promotes aerobic activated sludge to form granular sludge. It contains a small amount of trace nutrients and can effectively improve the activity of sludge. The GSP particles used in the present invention are tiny and porous, with a particle size of less than 150μm and a large specific surface area. After contacting water, the surface of the particles will carry a positive charge, and will quickly attract and aggregate with negatively charged bacterial flocs and microorganisms, and gradually form granular sludge with microparticles as the core carrier under the action of the granular sludge incubator. The microcarrier core of the granular sludge will slowly dissolve, continuously providing calcium nutrition for the granular sludge, and at the same time effectively enhancing and maintaining the strength of the granular sludge, making it not easy to break, providing a stable microecological environment for the aerobic, mixotrophic, anaerobic and autotrophic bacteria in the granular sludge from the outside to the inside, effectively improving the sludge activity, greatly improving the comprehensive treatment capacity of the biochemical system, and achieving excellent results in nitrogen and phosphorus removal, while greatly reducing the sludge yield and aerobic aeration energy consumption.

[0023] Furthermore, the process can be applied to the existing continuous flow AGS process in operation, and can also be applied to a newly built continuous flow aerobic activated sludge process.

[0024] Furthermore, an aerobic granular sludge process applied to a continuous flow activated sludge process specifically comprises the following steps:

[0025] Step 1: Connect the excess sludge pipeline in the continuous flow activated sludge process to the excess sludge desander and excess sludge filter, and the excess sludge after desanding and filtration enters the granular sludge incubator;

[0026] Step 2: Add a pelletizing agent into the granular sludge incubator; the single addition amount shall not exceed 5% of the total amount, and the conventional single addition amount shall be 1.5% to 3.5% of the total amount;

[0027] Step 3: The incubated spheroidizing agent and the filamentous bacteria in the activated sludge are targeted to form preliminary young flocs; the sludge is returned to the front end of the aerobic zone in the continuous flow activated sludge process through the granular sludge return pump;

[0028] Step 4: Repeat steps 2 and 3, and after the initial continuous incubation for 7 days, start the granular sludge and flocculent sludge cyclone separators;

[0029] Step 5: After 30 to 40 days, a certain proportion of AGS (equivalent particle size > 0.2 mm, SVI5 ≈ SVI30) will be formed in the biochemical system and coexist with the traditional flocculent sludge; at this time, the continuous flow AGS process debugging is completed;

[0030] Step 6: Determine the proportion of granular sludge in the biochemical pool by scanning electron microscope (SEM) microscopy and Mastersizer-2000 laser particle size analyzer. When the proportion of granular sludge reaches 30% of the total sludge volume, stop adding the pelletizing agent;

[0031] Step 7: According to the system operating conditions, the sludge desander, sludge filter, granular sludge and flocculent sludge cyclone separators and other equipment are operated in conjunction with the residual sludge discharge system.

[0032] Furthermore, the separation efficiency of the cyclone separator for granular sludge and flocculent sludge is ≥ 95%;

[0033] Furthermore, the ratio of granular sludge to flocculent sludge in the biochemical pool is 1:5 to 1:2;

[0034] Furthermore, in the continuous flow AGS process, the sludge retention time of flocculent sludge and granular sludge can be separated;

[0035] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0036] 1. The present invention solves the problems of cultivating AGS and continuous and stable operation in related continuous flow activated sludge wastewater treatment. After forming continuous flow aerobic granular sludge, the traditional activated sludge process can have the functions of in-situ capacity expansion, improving process resistance to shock load, saving chemical addition and in-situ sludge reduction.

[0037] 2. The present invention provides a method for rapidly cultivating AGS in an existing or newly built continuous flow activated sludge process and maintaining the stable operation of the system; simultaneously realizing the effects of efficient biological phosphorus removal and simultaneous nitrification and denitrification in an aerobic tank, and having obvious effects on the in-situ expansion of the sewage treatment plant and the in-situ reduction of the sludge; at the same time, the targeted effect of the ball-forming agent can overcome the formation of granular sludge under low influent pollutant concentrations, and is suitable for the transformation of various continuous flow activated sludge processes. The overall equipment is installed in a skid-mounted form without changing the existing sewage treatment structures and operating parameters. It is applied to sewage treatment plants with significant energy-saving and carbon-reduction effects, and has a large market application prospect.

[0038] 3. The present invention adopts the ball-forming agent induction form to transform aerobic granular sludge, which has the characteristics of fast startup speed, stable aerobic granular sludge formation, and certain universality for different sewage treatment plants with complex influent organic matter concentrations. On the basis of forming aerobic granular sludge, the flocculent sludge and granular sludge in the continuous flow aerobic granular sludge can be completely separated by the sludge retention time SRT through the equipment used in the present invention, providing the overall MLVSS / MLSS ratio of the system and reducing the SVI30 value. The continuous flow aerobic granular sludge process transformed by the present invention has obvious economic and environmental benefits.

[0039] 4. The process of the present invention can improve the treatment efficiency and stability. By adding a spheronizing agent to the residual sludge, the targeted binding of filamentous bacteria in the activated sludge is promoted to form preliminary young flocs, which are then returned to the biochemical system for domestication after incubation. This approach helps to accelerate the formation of aerobic granular sludge, so that a certain proportion of AGS can be established in the biochemical system quickly to coexist with traditional flocculent sludge. AGS has better sedimentation performance and impact resistance than traditional flocculent sludge, thereby improving the stability and treatment efficiency of the entire sewage treatment system.

[0040] The cyclone separation system is used to effectively separate the granular sludge and flocculent sludge, ensuring that the granular sludge can be continuously returned to the biochemical system, while the flocculent sludge is discharged to the sludge concentration tank or storage tank for dehydration. This not only ensures the concentration of granular sludge in the biochemical system, but also reduces unnecessary sludge discharge, further improving the treatment effect.

[0041] 5. The process of the present invention can flexibly adapt to existing processes and equipment, and is compatible with a variety of continuous flow activated sludge processes. It can be directly applied to existing sewage treatment facilities without changing the current or proposed operating parameters of the sewage treatment process, and has a wide range of applicability. All new system equipment is in a centralized skid-mounted form and is externally arranged between the biochemical system and the sludge return system. This method does not require large-scale transformation of existing sewage treatment facilities, reduces implementation costs and time, and is also easy to maintain and manage. In addition, this design makes the process easy to integrate into different sewage treatment plants, enhancing its flexibility and operability.

[0042] 6. The process of the present invention can reduce sludge production and operating costs. By promoting the formation of aerobic granular sludge (AGS), the process can significantly reduce the production of excess sludge. AGS has a higher microbial density and better sedimentation performance, and can process more organic matter in a smaller volume, thereby reducing the amount of flocculent sludge that needs to be discharged and treated. This not only reduces the cost of sludge treatment, but also reduces the environmental pressure caused by sludge disposal.

[0043] Compared with the traditional activated sludge method, the AGS process of the present invention can more efficiently utilize oxygen for biodegradation, which means that under the same treatment effect, the energy consumption required for aeration may be lower. In addition, since no additional fillers or carriers are required, the purchase and maintenance costs of related materials are also avoided. Therefore, on the whole, the process can reduce the operating costs of sewage treatment plants and improve economic benefits. At the same time, in traditional activated sludge systems, in order to maintain good sludge settling performance, it is often necessary to add chemical agents such as flocculants. AGS itself has excellent settling performance, which reduces dependence on these chemicals and further reduces operating costs and impacts on the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a schematic diagram of the overall process flow of Example 1.

[0045] Among them, 1. biochemical system, 2. secondary sedimentation tank, 3. sludge return and residual sludge pump room, 4. nitrification liquid return pump of biochemical system, 5. sludge return pump of biochemical system, 6. water inlet pipe of biochemical system, 7. water outlet pipe of biochemical system, 8. residual sludge discharge pipe, 9. granular sludge incubator, 10. pelletizing agent addition, 11. granular sludge and flocculent sludge cyclone separator, 12. residual sludge filter, 13. residual sludge desander, 14. residual sludge lifting pump, 15. granular sludge return pump, 16. bottom discharge port of cyclone, 17. flocculent sludge discharge pipe, 18. granular sludge return pipe.

[0046] Figure 2Schematic diagram of the proportion of different diameters of AS (activated sludge, i.e. ordinary activated sludge in continuous flow process) and AGS.

[0047] Figure 3 Schematic diagram of water inflow on different dates.

[0048] Figure 4 Schematic diagram of the unit consumption of polyferric sulfate on different dates.

[0049] Figure 5 TN / NO3 at different sites - -N concentration.

[0050] Figure 6 This is a schematic diagram of 80% sludge production per 10,000 tons of water on different dates.

[0051] Figure 7 The output of 10,000 tons of water-dried sludge on different dates. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] Example 1

[0054] This embodiment provides an aerobic granular sludge process applied to a continuous flow activated sludge process, which specifically includes the following steps:

[0055] The pre-treated sewage enters the biochemical system 1 through the biochemical system water inlet pipe 6. After biochemical treatment, the mud-water mixture enters the secondary sedimentation tank 2 for mud-water separation and sedimentation. The treated water is discharged through the biochemical system water outlet pipe 7. The precipitated residual sludge enters the sludge return and residual sludge pump room 3. The nitrification liquid in the biochemical system 1 is returned through the biochemical system nitrification liquid return pump 4, and the sludge return is realized through the biochemical system sludge return pump 5.

[0056] The sludge return in the continuous flow activated sludge process and the excess sludge in the excess sludge pump room 3 are sent to the excess sludge desander 13 and the excess sludge filter 12 through the excess sludge lifting pump 14; most of the sand particles and large inorganic particles in the excess sludge are removed;

[0057] The remaining sludge after sand removal and filtration enters the granular sludge incubator 9, and a pelletizing agent 10 is added into the granular sludge incubator 9;

[0058] After the initial continuous incubation for 7 days, the granular sludge and flocculent sludge cyclone separator 16 is turned on;

[0059] The granular sludge and flocculent sludge cyclone separator 11 is turned on, and the granular sludge formed in the biochemical tank 1 flows back to the front end of the aerobic zone in the biochemical tank 1 through the discharge port 16 at the bottom of the cyclone; the flocculent sludge is connected to the residual sludge discharge pipe 8 through the flocculent sludge discharge pipe 17, and the residual sludge is discharged;

[0060] After 40 days, a certain proportion of AGS (equivalent particle size > 0.2 mm, SVI5 ≈ SVI30) will be formed in the biochemical system and coexist with the traditional flocculent sludge; at this time, the continuous flow AGS process debugging is completed;

[0061] Through the use of scanning electron microscope (SEM) and Mastersizer-2000 laser particle size analyzer and other testing methods, the proportion of granular sludge in the biochemical pool is determined, and the addition of spheronizing agent is stopped;

[0062] According to the system operating conditions, equipment such as sludge desander, sludge filter, granular sludge and flocculent sludge cyclone separators are operated in conjunction with the residual sludge discharge system.

[0063] Application Example 1

[0064] The designed scale of the sewage treatment plant is 40,000 m 3 / d, the main biochemical treatment process of sewage is "Improved A 2 / O biochemical pool", pretreatment is coarse screen + fine screen and aerated grit chamber + primary sedimentation tank, deep treatment uses filter cloth filter + chlorine disinfection. The total design residence time of the biochemical pool is 19.2h, the maximum sludge return ratio is 100%, and the maximum nitrification liquid return ratio is 300%. The operating inlet and outlet water indicators are shown in Table 1.

[0065] Table 1 Operation inlet and outlet water indicators

[0066]

[0067]

[0068] Based on the above method, the dosage of the pelletizing agent is set to 0.8‰ of the total volume of the biochemical pool, the overall dosage cycle is 40 days, and the single dosage is 2.5% of the total dosage; the overall debugging and acclimation cycle is 40 days. The proportion of AGS with a diameter D greater than 0.2 mm in the biochemical pool increased from the initial 1.54% to 18.26%, such as Figure 2As shown. The GSP particles used in the present invention are tiny and porous, with a particle size of less than 150μm and a large specific surface area. After contacting water, the surface of the particles will be positively charged, and will quickly attract and aggregate with negatively charged bacterial flocs and microorganisms, and gradually form granular sludge with microparticles as core carriers under the action of the granular sludge incubator. The microcarrier core of the granular sludge will slowly dissolve, continuously providing calcium nutrition for the granular sludge, and at the same time can effectively enhance and maintain the strength of the granular sludge, and is not easy to break, providing a stable microecological environment for the aerobic bacteria, mixotrophic bacteria, anaerobic bacteria and autotrophic bacteria from the outside to the inside of the granular sludge, effectively improving the sludge activity, greatly improving the comprehensive treatment capacity of the biochemical system, and having excellent nitrogen and phosphorus removal effects, while greatly reducing the sludge yield and aerobic aeration energy consumption.

[0069] After the continuous flow activated sludge process was implemented, the average daily water treatment volume was 45917.0m 3 / d, maximum water treatment capacity 74368.0m 3 / d, of which the design scale exceeds 40,000 m 3 / d reaches 293 days. The average monthly water inflow of two years of the same direction is summarized and compared, such as Figure 3 Before the present invention was adopted, the average monthly water intake was 1.0641 million m 3 After the transformation using the present invention, the average monthly water intake is 1.4015 million m 3 Among them, the water treatment volume is more than 40,000 m 3 There were 293 days with an average increase of 20.34%. The smallest monthly processing volume was in November, which was 1.1978 million m 3 The maximum month is September, which is 1.5987 million m 3 The continuous water impact period is from June 19 to July 6, 2024. Within 18 days, the maximum daily treated water volume is 74368.0m 3 / d, the minimum daily treated water volume is 53576.0m 3 / d, the average daily water treatment volume can reach 64458.0m 3 / d, the overall over-design load was 61.14%. The continuous flow AGS technology showed good impact resistance when the water volume suddenly increased and continued to impact.

[0070] Application Example 1: Improved A 2O process, the subsequent deep treatment uses a filter cloth filter to remove suspended solids (SS). Therefore, before the AGS transformation, it is designed to use polyferric chloride (PAF) to add to the water outlet of the biochemical pool and the water inlet of the secondary sedimentation tank for chemical phosphorus removal, and to reduce the SS value of the effluent from the secondary sedimentation tank by adding a coagulant to reduce the operating load of the subsequent filter media. Application Example 1 After the project is put into operation, without the addition of PAF, the effluent from the secondary sedimentation tank can meet the effluent standard of TP < 0.3 mg / L. However, in order to control the problem of high SS of the effluent from the secondary sedimentation tank under the water shock load, the automatic dosing system in the factory will appropriately add PAF according to the SS value of the effluent from the secondary sedimentation tank. Through the above data analysis, it can be seen that after the transformation of the present invention, under the condition of a 31% increase in the amount of treated water, the annual PAF consumption is reduced from 482.78t to 313.43t, and the PAF consumption per 10,000 tons of water is reduced from 0.42t / 10,000m 3 Reduced to 0.19t / 10,000m 3 .See Figure 4 .

[0071] AGS has a dense structure and a large particle size. Due to the limitation of oxygen mass transfer, the outside of the granular sludge is an aerobic zone, and the inside is anoxic or anaerobic zone. This microenvironment is conducive to the synergistic effect of different microbial communities and has an extremely rich biological phase. The outermost layer of AGS is mainly distributed with nitrifying bacteria, and the inside of the granules mainly contains polyphosphate bacteria, denitrifying bacteria, and polysaccharide bacteria, which also exist in traditional activated sludge systems.

[0072] The organic pollutants on the outermost layer of AGS are efficiently oxidized, and nitrifying bacteria also gather on the outer layer of the particles, converting ammonia nitrogen into nitrate nitrogen. The nitrate nitrogen produced by nitrification diffuses into the anoxic layer inside the particles, and then denitrification occurs, achieving denitrification.

[0073] Application Example 1: By adding nitrate nitrogen and total nitrogen meters at different points in the plug-flow aerobic pool, the total nitrogen at the inlet and outlet of the aerobic pool showed a downward trend through testing. The decline values ​​during the testing period were statistically from low to high: 0.76mg / L, 1.62mg / L, 1.65mg / L, 2.34mg / L and 4.44mg / . During daily stable operation, the absolute value of total nitrogen removal in the aerobic pool is generally between 1.5 and 2.0mg / L, which is also verified by the reduction in carbon source usage. In the aerobic pool area, there is a certain short-range denitrification effect. See the results. Figure 5 .

[0074] After the continuous flow AGS process is running stably, the granular sludge and flocculent sludge cyclone separator 11 is turned on, and the granular sludge and flocculent sludge can be separated with high efficiency. The sludge retention time SRT of the two sludges can be completely separated. The sludge apparent yield of the granular sludge is extremely low, and the in-situ reduction of the biochemical sludge can be achieved in the system.

[0075] Application Example 1: Through a year of data statistics, after the transformation of the present invention, under the condition that the water volume increased by 31%, the 80% sludge production per 10,000 tons of water increased from the monthly average of 10.39t / 10,000m 3 Reduced to a monthly average of 6.56t / 10,000m 3 The monthly average of 2.06tDS / 10,000m 3 Reduced to a monthly average of 1.31tDS / 10,000m 3 The results are shown in Figure 6-7 .

[0076] It can be seen from the above embodiments that the present invention is used to transform the existing continuous flow activated sludge process into a continuous flow AGS process, which can increase the process operating water volume, improve the resistance to shock loads, save daily chemical dosage and reduce in-situ sludge, and has significant energy-saving and carbon-reduction effects. It is a promising new sewage treatment process.

[0077] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An aerobic granular sludge sewage treatment process applied to a continuous flow activated sludge process, characterized in that: In the sewage treatment process, during the continuous operation of the continuous flow activated sludge process, a spheroidizing agent is added into the granular sludge incubator to make it bind with the filamentous bacteria in the activated sludge in a targeted manner to form granular sludge, and the granular sludge and flocculent sludge are effectively separated through a cyclone separation system. The granular sludge is continuously returned to the biochemical system, and the flocculent sludge is discharged into a sludge thickening tank or a sludge storage tank for dehydration treatment.

2. The aerobic granular sludge sewage treatment process applied to the continuous flow activated sludge process according to claim 1, characterized in that: The continuous flow activated sludge process is selected from the traditional A 2 O process, improved A 2 O process, oxidation ditch process, MSBR process or Bardenpho process.

3. The aerobic granular sludge sewage treatment process applied to the continuous flow activated sludge process according to claim 1, characterized in that: The spheronizing agent is a modified inert porous carrier with a particle size of 80 to 100 meshes.

4. The aerobic granular sludge sewage treatment process applied to the continuous flow activated sludge process according to claim 1, characterized in that: The minimum separation particle size of the cyclone separation system for separating granular sludge and flocculent sludge is 10 to 40 microns.

5. The aerobic granular sludge sewage treatment process applied to the continuous flow activated sludge process according to claim 1, characterized in that: The equivalent particle size of stably formed AGS is >0.2mm.

6. The aerobic granular sludge sewage treatment process applied to the continuous flow activated sludge process according to claim 1, characterized in that: The total dosage of the spheroidizing agent is 0.5‰ to 1.0‰ of the total volume of the biochemical pool.

7. The aerobic granular sludge sewage treatment process applied to the continuous flow activated sludge process according to claim 1, characterized in that: The aerobic granular sludge sewage treatment process is applied to the currently operating continuous flow activated sludge process.

8. The aerobic granular sludge sewage treatment process applied to the continuous flow activated sludge process according to claim 1, characterized in that: The aerobic granular sludge sewage treatment process is applied to a newly built continuous flow activated sludge process.

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