An aerobic granular sludge water treatment system and method with filler addition

Abstract

The present application relates to a kind of dosing filler's aerobic granular sludge water treatment system and method, when using continuous flow aerobic granular sludge water treatment system, along the water flow direction of wastewater to be treated in sequence includes first hydrolysis acidification pool, anaerobic pool, sludge flocculation pool, aerobic granular sludge reaction pool, sludge selection pool, secondary sedimentation tank;When using sequencing batch aerobic granular sludge water treatment system, along the water flow direction of wastewater to be treated in sequence includes second hydrolysis acidification pool and effluent conditioning tank, sequencing batch aerobic granular sludge reaction pool.The present application forms "crystal nucleus" by adding hemispherical microbial carrier filler, accelerates the self-condensation of microorganism inside and outside to form granular biological aggregate, better realizes high pollutant removal rate, high sludge quantity, long sludge age, high sludge settling velocity, high-efficiency sludge selection separation and other technical effects in continuous flow and sequencing batch water treatment system respectively, with the advantages of improving system impact load capacity, toxic and harmful ability, low temperature resistance and the like.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of water treatment, and particularly relates to an aerobic granular sludge water treatment system and method with filler addition. BACKGROUND

[0002] The aerobic granular sludge technology is currently considered as a promising biological treatment technology for sewage treatment. The formation mechanism of the aerobic granular sludge is relatively complex, and there are four hypotheses: the crystal nucleus hypothesis, the extracellular polymeric substance (EPS) hypothesis, the self-condensation hypothesis, and the selection pressure hypothesis.

[0003] The crystal nucleus hypothesis takes the crystal nucleus as the core, and different functional microorganisms adhere to the core and continuously increase the size. The EPS hypothesis points out that the EPS can increase the hydrophobicity of the sludge surface and reduce the electronegativity of the sewage surface, thereby promoting the granulation of the sludge. The self-condensation hypothesis points out that the sludge can be self-condensed into a three-dimensional structure under suitable conditions, continuously aggregated and enlarged, and compressed, and the structure is compact and the appearance is regular. The selection pressure hypothesis selects the sludge with poor settling performance by controlling the settling time, so as to maintain the concentration of the aerobic granular sludge.

[0004] Regardless of the formation mechanism, from the design of the process technology, the existing aerobic granular sludge technology, whether it is a continuous flow or a sequencing batch type, is based on one or several of the above-mentioned hypotheses to create the basic conditions for the aerobic granular sludge reaction, including but not limited to the type of seed sludge, the composition of the substrate, the organic load, the pH value, the type of reactor, the height-diameter ratio, the water flow direction, the aeration intensity, the operating temperature, the settling time, etc. However, there are few technologies that can maximize the interpretation of the above-mentioned hypotheses in terms of mechanism, and therefore, in the implementation process, some practical problems will affect the application of the technology. SUMMARY

[0005] In view of the defects in the prior art, the purpose of the present application is to provide an aerobic granular sludge water treatment system and method with filler addition, which uses a hemispherical biological carrier filler to form a crystal nucleus, fully creates conditions for rapid and stable adhesion and fixation of microorganisms, and constructs different aerobic granular sludge water treatment systems and methods according to different environmental conditions of different projects. At the same time, the problem of easy disintegration of general aerobic granular sludge technology after being impacted is solved.

[0006] To achieve the above purpose, the technical scheme adopted by the present application is as follows: a continuous-flow aerobic granular sludge water treatment system with filler addition, which comprises, in sequence along the water flow direction from the inlet to the outlet of the wastewater to be treated, a first hydrolysis acidification tank, an anaerobic tank, a sludge flocculation tank, an aerobic granular sludge reaction tank, a sludge selection tank, and a secondary sedimentation tank.

[0007] The first hydrolysis acidification tank adopts an up-flowing reactor, a first water distribution system is designed at the lower part of the first hydrolysis acidification tank, and a first hydrolysis acidification tank effluent weir is designed at the upper part of the first hydrolysis acidification tank; the inlet of the first water distribution system is connected with the outlet of a first hydrolysis acidification tank water inlet pipe;

[0008] A high-speed stirrer is arranged in the anaerobic tank, and an anaerobic tank filter screen is arranged at the water outlet of the anaerobic tank; a flow guide cylinder, a low-speed stirrer and a carbon source adding ring are arranged in the sludge flocculation tank; one end of a sludge flocculation tank water inlet pipe is connected with the water outlet of the anaerobic tank, and the other end is connected with the inlet of the flow guide cylinder;

[0009] The aerobic granular sludge reaction tank is provided with a uniformly distributed microporous aeration system at the lower part, the aerobic granular sludge reaction tank is uniformly dispersed with aerobic granular sludge, and the aerobic granular sludge takes a hemispherical microbial carrier filler as a carrier core; the outlet of the aerobic granular sludge reaction tank water outlet pipe is distributed in the middle of the sludge selection tank, sludge selection controllers with different heights and a heavy sludge reflux system are arranged at the middle and lower parts of the sludge selection tank; a sludge selection tank water outlet is arranged at the upper part of the sludge selection tank; the heavy sludge reflux system is connected with the sludge flocculation tank water inlet pipe through a heavy sludge reflux main pipe;

[0010] The secondary sedimentation tank is provided with a secondary sedimentation tank water inlet pipe, a secondary sedimentation tank effluent weir and a secondary sedimentation tank sludge reflux main pipe; the secondary sedimentation tank water inlet pipe is connected with the sludge selection tank water outlet; a selection tank filter screen is arranged at the front end of the secondary sedimentation tank water inlet pipe; the secondary sedimentation tank effluent weir is connected with a secondary sedimentation tank water outlet pipe; and the secondary sedimentation tank sludge reflux main pipe is connected with the anaerobic tank and the first hydrolysis acidification tank water inlet pipe through an anaerobic tank sludge inlet pipe and a first hydrolysis acidification tank sludge inlet pipe respectively.

[0011] Further, the system further comprises a first water inlet pump, a first water inlet pump water inlet pipe is connected with the wastewater tank to be treated, and a first water inlet pump water outlet pipe is connected with the inlet of the first hydrolysis acidification tank water inlet pipe.

[0012] The first hydrolysis acidification tank sludge inlet pipe is connected with the middle part of the first hydrolysis acidification tank water inlet pipe.

[0013] Further, the first hydrolysis acidification tank is filled with soft or semi-soft filler.

[0014] Further, the water inlets and outlets of the anaerobic tank are staggered in the vertical direction, and the water outlet of the anaerobic tank is arranged on the side away from the water inlet of the anaerobic tank.

[0015] The high-speed stirrer is a submersible stirrer.

[0016] The heavy sludge reflux main pipe is in communication with the middle part of the sludge flocculation tank water inlet pipe.

[0017] Further, the microporous aeration system is connected with a blower through an aerobic granular sludge air inlet pipe.

[0018] The effluent of the aerobic granular sludge reaction tank is discharged into the middle of the sludge selection tank through a tank effluent weir and an aerobic granular sludge tank effluent pipe;

[0019] The aerobic granular sludge reaction tank is a plug flow type or a complete mixing type;

[0020] The aerobic granular sludge reaction tank is a single tank or a multiple tank.

[0021] Further, the hemispherical microbial carrier filler is an organic biological filler, and the hemispherical microbial carrier filler contains denitrifying bacteria required for the metabolism of pollutants; the denitrifying bacteria on the hemispherical microbial carrier filler are firmly fixed in the hemispherical microbial carrier filler;

[0022] According to different types of wastewater, sludge concentrations, and shapes and sizes of the tank body of the aerobic granular sludge reaction tank, the dosing amount of the hemispherical microbial carrier filler is determined.

[0023] Further, the heavy sludge reflux system comprises a first heavy sludge reflux pipe and a second heavy sludge reflux pipe arranged at different heights in the sludge selection tank and connected with a first heavy sludge reflux air-lift pipe and a second heavy sludge reflux air-lift pipe controlled by independent electric valves respectively;

[0024] The first heavy sludge reflux air-lift pipe and the second heavy sludge reflux air-lift pipe are connected with an air-lift main pipe, the air-lift main pipe is connected with an air compressor, and the outlet ends of the first heavy sludge reflux pipe and the second heavy sludge reflux pipe are connected with the heavy sludge reflux main pipe;

[0025] The sludge reflux main pipe of the secondary sedimentation tank and the sludge inlet pipe of the anaerobic tank are connected with the air-lift main pipe through a reflux sludge air-lift pipe controlled by an independent electric valve.

[0026] The application also provides a continuous-flow aerobic granular sludge water treatment method with filler dosing, which is realized based on the continuous-flow aerobic granular sludge water treatment system with filler dosing, and comprises the following steps:

[0027] S1, pretreating wastewater: in a first hydrolysis acidification tank, complex macromolecular substances in wastewater are decomposed into small molecular substances by acid-producing bacteria, so as to obtain hydrolysis acidification wastewater;

[0028] S2, anaerobic carbon reduction and phosphorus removal: the hydrolysis acidification wastewater is completely mixed with refluxed light sludge in an anaerobic tank, so as to obtain anaerobic carbon reduction and phosphorus removal wastewater;

[0029] S3, aerobic granular sludge reaction: after anaerobic decarburization and phosphorus removal, the wastewater in the sludge flocculation tank is fully contacted with the backflow heavy sludge, and then enters the aerobic granular sludge reaction tank to react with the uniformly dispersed aerobic granular sludge therein; the effluent of the aerobic granular sludge reaction tank is discharged into the middle of the sludge selection tank, and the efficient separation of heavy sludge and light sludge is promoted by the sludge selection controller, wherein the heavy sludge is backflowed to the sludge flocculation tank to react with the wastewater, and the light sludge and the effluent after reaction are discharged into the secondary sedimentation tank;

[0030] S4, sedimentation separation: the light sludge and the effluent after reaction are separated by sedimentation in the secondary sedimentation tank, and the supernatant obtained is discharged as the final effluent from the system; part of the sludge at the bottom of the secondary sedimentation tank is backflowed to the anaerobic tank and the hydrolysis acidification tank, and the remaining sludge is discharged from the system.

[0031] The application further provides a sequencing batch aerobic granular sludge water treatment system with filler addition, which comprises a second hydrolysis acidification tank and an effluent adjusting tank, and a sequencing batch aerobic granular sludge reaction tank in sequence along the water flow direction from the influent to the effluent of the wastewater to be treated, wherein:

[0032] The second hydrolysis acidification tank and the effluent adjusting tank comprise a second hydrolysis acidification tank and an effluent adjusting tank, the second hydrolysis acidification tank is an upflow type reaction tank, the lower part of the second hydrolysis acidification tank is designed with a second water distribution system, and the upper part is designed with a second hydrolysis acidification tank effluent weir; the lower part of the second hydrolysis acidification tank is connected with a second light sludge backflow pipe; a booster pump is arranged in the effluent adjusting tank, and the booster pump is combined with a booster pump influent pipe and a booster pump effluent pipe to lift the effluent of the second hydrolysis acidification tank into the sequencing batch aerobic granular sludge reaction tank according to the needs of the sequencing batch process;

[0033] The water flow state in the sequencing batch aerobic granular sludge reaction tank is upflow type, the bottom of the sequencing batch aerobic granular sludge reaction tank is provided with a sequencing batch aerobic granular sludge reaction tank influent pipe and a third water distribution system, the inlet of the sequencing batch aerobic granular sludge reaction tank influent pipe is connected with the booster pump effluent pipe, and the outlet is connected with the third water distribution system; the lower part of the sequencing batch aerobic granular sludge reaction tank is provided with a uniformly distributed aerobic granular sludge reaction tank aeration system; the upper part of the sequencing batch aerobic granular sludge reaction tank is uniformly provided with an effluent weir groove and an effluent groove; a sludge selection system is arranged in the sequencing batch aerobic granular sludge reaction tank, and the sequencing batch aerobic granular sludge reaction tank is connected with the second light sludge backflow pipe through a sludge backflow pipe and a control valve;

[0034] The sequencing batch aerobic granular sludge reaction tank is uniformly dispersed with aerobic granular sludge, and the aerobic granular sludge takes a hemispherical microbial carrier filler as the core of the carrier.

[0035] Further, the second water distribution system is connected with a second influent pump through a second hydrolysis acidification tank influent pipe, and the second influent pump influent pipe is connected with a wastewater tank to be treated.

[0036] According to different project conditions, it is determined whether to fill soft or semi-soft filler in the second hydrolysis acidification tank.

[0037] Further, the sequencing batch aerobic granular sludge reaction tank adopts single tank independently or multiple tanks in parallel.

[0038] The aerobic granular sludge reaction tank aeration system is connected with the large air volume blower and the small air volume blower through the aerobic granular sludge reaction tank aeration branch pipe connected with each aeration head; through the switching operation of the large air volume blower and the small air volume blower, the stirring and intermittent aeration of the sequencing batch aerobic granular sludge reaction tank are realized.

[0039] Further, the selection pressure control condition is constructed through the sludge selection system, so that the shape, particle size and structure of the aerobic granular sludge are stabilized, and the light sludge is separated.

[0040] Further, the semi-spherical microbial carrier filler is an organic biological filler, and the denitrifying bacteria required for the metabolism of pollutants are arranged in the semi-spherical microbial carrier filler; the denitrifying bacteria on the semi-spherical microbial carrier filler are firmly fixed in the semi-spherical microbial carrier filler.

[0041] The application also provides a sequencing batch aerobic granular sludge water treatment method with filler addition, which is realized based on the sequencing batch aerobic granular sludge water treatment system with filler addition, and the method comprises the following steps:

[0042] S1, pretreatment of wastewater: in the second hydrolysis acidification tank and the effluent adjusting tank, the acid-producing bacteria in the second hydrolysis acidification tank decompose complex macromolecular substances in the wastewater into small molecular substances, the hydrolyzed and acidified wastewater is discharged into the effluent adjusting tank, and the sequencing batch aerobic granular sludge reaction tank is entered according to the sequencing batch process setting;

[0043] S2, aerobic granular sludge reaction: after the hydrolyzed and acidified wastewater enters the sequencing batch aerobic granular sludge reaction tank, the wastewater is reacted and degraded with the uniformly dispersed aerobic granular sludge under the stirring action formed by the switching operation of the large and small blowers; then the light and heavy sludge is screened and separated through the sludge selection system, the gas stripping device is combined to realize the gas stripping and reflux of part of the light sludge to the second hydrolysis acidification tank, the light sludge is discharged to the subsequent sludge concentration and dewatering system according to the cycle time sequence, and the water produced by the sequencing batch aerobic granular sludge reaction tank is discharged as the final effluent.

[0044] The beneficial effects of this invention are as follows: The aerobic granular sludge water treatment system and method with added packing provided by this invention, when using a continuous flow aerobic granular sludge water treatment system, sequentially includes a first hydrolysis acidification tank, an anaerobic tank, a sludge flocculation tank, an aerobic granular sludge reaction tank, a sludge selection tank, and a secondary sedimentation tank along the water flow direction of the wastewater to be treated; when using a sequencing batch aerobic granular sludge water treatment system, sequentially includes a second hydrolysis acidification tank, an effluent equalization tank, and a sequencing batch aerobic granular sludge reaction tank along the water flow direction of the wastewater to be treated. This invention, by adding hemispherical microbial carrier packing to form "crystal nuclei," accelerates the self-aggregation of internal and external microorganisms to form granular biopolymers. This better achieves high pollutant removal rates, high sludge volume, long sludge age, high sludge settling velocity, and efficient sludge selection and separation in both continuous flow and sequencing batch water treatment technologies. It also has advantages such as improved system resistance to shock loads, resistance to toxic and harmful substances, and low-temperature resistance. The system and method provided by this invention fully leverage the technical advantages of aerobic granular sludge technology, such as wide applicability, stable operation, small footprint, low sludge discharge, simple operation, low cost, and good effluent quality.

[0045] The beneficial effects of the aerobic granular sludge preparation system and method for adding filler provided by the present invention also include:

[0046] (1) The “crystal nucleus” formed by the hemispherical biological carrier packing is used as the core to promote the formation and stability of aerobic granular sludge. The structure and material properties of the packing itself are conducive to the enrichment of different types of microorganisms on its surface. Under good reaction conditions, the shape, size and structure of aerobic granular sludge are maintained, thereby ensuring efficient carbon reduction, nitrogen removal and phosphorus removal functions. At the same time, it also solves the technical problem that general aerobic granular sludge technology is easy to disintegrate after being impacted.

[0047] (2) Based on the reaction conditions required by the carrier packing "crystal nucleus" aerobic granular sludge, continuous flow and sequencing batch aerobic granular sludge reaction technology systems were designed respectively. By flexibly adjusting the control parameters of each functional unit in the system, the system can meet the project conditions such as influent and effluent, and land occupation of different engineering projects, so as to maximize the advantages of aerobic granular sludge technology and better match different application scenarios, especially the treatment of high-concentration and high-difficulty wastewater in industrial parks and enterprises.

[0048] (3) In terms of functional unit design, based on the stability of the "crystal nucleus" aerobic granular sludge, for units with high energy consumption such as sludge return and aeration, the actual reaction needs of aerobic granular sludge are precisely matched by adopting methods such as air lift return, intermittent aeration, and combined operation of large and small blowers, thus avoiding energy waste. The energy saving and consumption reduction effect of the technical system is very obvious.

[0049] (4) For the general aerobic granular sludge technology, the granulation of sludge can be quickly realized, and the mature aerobic granular sludge can be cultivated in a short time (generally within 30 days), and based on the stability of the "crystal nucleus" structure, the impact load capacity of the process system is greatly improved, and the overall operation is stable and efficient. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 A planar arrangement schematic diagram of a continuous flow aerobic granular sludge water treatment system provided by the embodiment of the present application is provided.

[0051] Figure 2 A cross-sectional schematic diagram of a continuous flow aerobic granular sludge water treatment system provided by the embodiment of the present application is provided.

[0052] Figure 3 Another cross-sectional schematic diagram of a continuous flow aerobic granular sludge water treatment system provided by the embodiment of the present application is provided.

[0053] Figure 4 A planar arrangement schematic diagram of a sequencing batch aerobic granular sludge water treatment system provided by the embodiment of the present application is provided.

[0054] Figure 5 A cross-sectional schematic diagram of a sequencing batch aerobic granular sludge water treatment system provided by the embodiment of the present application is provided.

[0055] Figure 6 A schematic diagram of a semi-spherical microbial carrier filler used in the aerobic granular sludge water treatment system provided by the embodiment of the present application is provided.

[0056] Figure 7 A schematic diagram of the COD and removal rate of the water in and out of the embodiment of the present application is provided.

[0057] Figure 8 A schematic diagram of the ammonia nitrogen and removal rate of the water in and out of the embodiment of the present application is provided.

[0058] Figure 9 A schematic diagram of the TN and removal rate of the water in and out of the embodiment of the present application is provided.

[0059] Figure 10 A schematic diagram of the TP and removal rate of the water in and out of the embodiment of the present application is provided.

[0060] Wherein, 101-first hydrolysis acidification tank; 102-anaerobic tank; 103-sludge flocculation tank; 104-oxygen granular sludge reaction tank; 105-sludge selection tank; 106-second sedimentation tank; 107-first water inlet pump; 108-first water distribution system; 109-high speed stirrer; 110-anaerobic tank filter screen; 111-low speed stirrer; 112-flow guide cylinder; 113-high efficiency microporous aeration system; 114-selection tank filter screen; 115-second sedimentation tank outlet weir; 116-blower; 117-air compressor; 118-first water inlet pump inlet pipe; 119-first water inlet pump outlet pipe; 120-first hydrolysis acidification tank inlet pipe; 121-sludge flocculation tank inlet pipe; 122-oxygen granular sludge tank outlet pipe; 123-second sedimentation tank inlet pipe; 124-second sedimentation tank outlet pipe; 125-second sedimentation tank sludge return main pipe; 126-anaerobic tank sludge inlet pipe; 127-first hydrolysis acidification tank sludge inlet pipe; 128-oxygen granular sludge inlet pipe; 129-first heavy sludge return pipe; 130-second heavy sludge return pipe; 131-heavy sludge return main pipe; 132-gas stripping main pipe; 133-first heavy sludge return gas stripping pipe; 134-second heavy sludge return gas stripping pipe; 135-return sludge gas stripping air pipe; 136-surplus sludge pipe; 201-second hydrolysis acidification tank and outlet water adjusting tank; 202-sequencing batch oxygen granular sludge reaction tank; 203-second water distribution system; 204-lift pump; 205-high air volume blower; 206-low air volume blower; 207-second air compressor; 208-outlet weir tank; 209-outlet tank; 210-third water distribution system; 211-oxygen granular sludge reaction tank aeration system; 212-sludge selection system; 213-second hydrolysis acidification tank inlet pipe; 214-lift pump inlet pipe; 215-lift pump outlet pipe; 216-sequencing batch oxygen granular sludge reaction tank inlet pipe; 217-oxygen granular sludge reaction tank aeration main pipe; 218-oxygen granular sludge reaction tank aeration branch pipe; 219-gas stripping return main pipe; 220-gas stripping return branch pipe; 221-outlet branch pipe; 222-outlet main pipe; 223-reaction tank sludge return pipe; 224-first light sludge return pipe; 225-second light sludge return pipe; 300-microbial carrier filler. DETAILED DESCRIPTION

[0061] The technical solutions in the embodiments of the present application will be further described clearly and completely in combination with the drawings and examples. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the examples in the present application, all other examples obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0062] The aerobic granular sludge water treatment system and method provided by the embodiment can form "crystal nucleus" by adding hemispherical microbial carrier filler, which is conducive to the attachment and fixation of different functional microorganisms, and can construct the typical layered structure of aerobic granular sludge, i.e., outer layer of aerobic, middle layer of anoxic and inner layer of anaerobic, and increase the hydrophobicity of the surface of the aerobic granular sludge. Through the continuous and sequencing batch process and the detailed design of each functional unit, the aerobic granular sludge formed in the aerobic granular sludge reactor can have a proper size and high sludge settling performance, can promote the rapid start of the formation process of the aerobic granular sludge in the early stage of the project, and greatly saves the start-up time. During the operation of the project, the shape, size and structure of the aerobic granular sludge are stable, which can ensure the high-efficiency carbon reduction, nitrogen removal and phosphorus removal functions, and can resist the impact of certain substrate concentration, salinity and low temperature, and overcome the technical problem that the general aerobic granular sludge technology is easy to disintegrate after being impacted.

[0063] As shown in Figures 1-3 The continuous-flow aerobic granular sludge water treatment system provided by the embodiment of the present application comprises, in sequence along the water flow direction from the wastewater inlet to the wastewater outlet, a first hydrolysis acidification tank 101, an anaerobic tank 102, a sludge flocculation tank 103, an aerobic granular sludge reaction tank 104, a sludge selection tank 105 and a secondary sedimentation tank 106. The sludge flocculation tank 103, the aerobic granular sludge reaction tank 104 and the sludge selection tank 105 constitute an aerobic granular sludge reaction module, wherein:

[0064] The first hydrolysis acidification tank 101 is in the form of an upflow reactor, and a first water distribution system 108 is designed at the lower part of the first hydrolysis acidification tank 101, and a first hydrolysis acidification tank effluent weir is designed at the upper part of the first hydrolysis acidification tank 101. The effluent of the first hydrolysis acidification tank is discharged into the subsequent anaerobic tank 102 through the first hydrolysis acidification tank effluent weir at the upper part. The first water distribution system 108 is connected to one end of a first hydrolysis acidification tank inlet pipe 120, the other end of the first hydrolysis acidification tank inlet pipe 120 is connected to a first inlet pump effluent pipe 119 of a first inlet pump 107, a first inlet pump inlet pipe 118 is connected to a wastewater tank, and a first hydrolysis acidification tank sludge inlet pipe 127 is connected to the middle part of the first hydrolysis acidification tank inlet pipe 120 to input the return light sludge.

[0065] The first hydrolysis acidification tank 101 performs pretreatment on the wastewater, and uses acid-producing bacteria to decompose complex macromolecular substances in the wastewater into small molecular substances such as acetic acid, so as to fully utilize the carbon source in the raw water, improve the biodegradability of the wastewater and reduce the potential toxicity of the inlet water. The effluent of the first hydrolysis acidification tank 101 after treatment enters the subsequent biochemical treatment system.

[0066] In a specific embodiment, whether to fill soft or semi-soft filler in the first hydrolysis acidification tank 101 can be further determined according to different project conditions.

[0067] The anaerobic tank 102 adopts complete mixing type, and a high-speed stirrer 109 is arranged in the anaerobic tank 102 to promote complete mixing of sewage entering the anaerobic tank 102 and refluxed light sludge input by the anaerobic tank sludge inlet pipe 126, so that degradation of organic matter and anaerobic phosphorus release are fully achieved; and the water outlet of the anaerobic tank 102 is connected with the sludge flocculation tank 103.

[0068] Optionally, the water inlet and the water outlet of the anaerobic tank 102 are staggered in the vertical direction, and the water outlet of the anaerobic tank 102 is arranged on the side away from the water inlet of the anaerobic tank 102, and an anaerobic tank filter screen 110 is arranged at the water outlet of the anaerobic tank 102 to ensure that the “nucleus” aerobic granular sludge (the “nucleus” aerobic granular sludge formed by taking the “nucleus” aerobic granular sludge formed by the semi-spherical microbial carrier filler 300 as the core) in the rear sludge flocculation tank 103 does not flow back to the anaerobic tank 102.

[0069] Specifically, the high-speed stirrer 109 is a submersible stirrer, and the water inlet of the anaerobic tank 102 is fully reacted with the refluxed sludge, so that efficient biological carbon reduction and phosphorus removal are achieved. After the water outlet of the anaerobic tank 102 passes through the anaerobic tank filter screen 110 arranged at the water outlet of the anaerobic tank 102, the water outlet is discharged into the subsequent aerobic granular sludge reaction module.

[0070] The sludge flocculation tank 103 is provided with a flow guide cylinder 112, a low-speed stirrer 111 and a carbon source adding ring. The refluxed heavy sludge (the “nucleus” aerobic granular sludge formed by the semi-spherical microbial carrier filler 300) input into the sludge flocculation tank 103 through the heavy sludge reflux main pipe 131 is reacted through high-multiple internal circulation, so that the refluxed heavy sludge (the “nucleus” aerobic granular sludge) and the water inlet are fully contacted under the condition of minimum disturbance of the “nucleus” aerobic granular sludge, good water inlet conditions and reaction conditions are created for the subsequent aerobic granular sludge, and the volume utilization rate of the aerobic granular sludge reaction tank 104 is improved.

[0071] Optionally, the low-speed stirrer 111 in the sludge flocculation tank 103 is a variable-frequency low-speed adjustable stirrer, so as to accurately control the particle size and function of the “nucleus” sludge.

[0072] Specifically, the heavy sludge reflux main pipe 131 is in communication with the middle part of the sludge flocculation tank water inlet pipe 121, one end of the sludge flocculation tank water inlet pipe 121 is connected with the water outlet of the anaerobic tank 102, and the other end is connected with the inlet of the flow guide cylinder 112.

[0073] The water inlet of the aerobic granular sludge reaction tank 104 is in communication with the water outlet of the sludge flocculation tank 103, and the lower part of the aerobic granular sludge reaction tank 104 is provided with a uniformly distributed microporous aeration system 113, so that the “nucleus” aerobic granular sludge is uniformly dispersed in the aerobic granular sludge reaction tank 104 to efficiently degrade pollutants. The microporous aeration system 113 is connected with the air blower 116 through the aerobic granular sludge air inlet pipe 128.

[0074] Optionally, the aerobic granular sludge reaction tank 104 can adopt the form of intermittent aeration, and can achieve flexible control on carbon reduction and nitrogen removal according to the specific requirements of total nitrogen concentration in effluent.

[0075] Optionally, the aerobic granular sludge reaction tank 104 can be designed as a single tank or multiple tanks according to the engineering scale, land conditions, and water quality requirements of influent and effluent.

[0076] Specifically, the aerobic granular sludge reaction tank 104 can be designed as a plug flow type or a complete mixing type, Figure 1 The aerobic granular sludge reaction tank 104 adopted is a complete mixing type.

[0077] In the aerobic granular sludge reaction tank 104, the "nucleus" aerobic granular sludge realizes rapid granulation of sludge in the startup period of the biochemical system and efficiently and stably plays the advantage of aerobic granular sludge in the running period.

[0078] The "nucleus" aerobic granular sludge takes the semispherical microbial carrier filler 300 as the carrier core, utilizes the different functional bacteria groups in the inner layer carrier microorganisms of the semispherical microbial carrier filler 300 and the outer sludge, realizes efficient carbon reduction, nitrogen removal, and phosphorus removal, further improves the removal effect of the aerobic granular sludge reaction tank 104, and ensures the stability of the aerobic granular sludge. The aeration amount of the microporous aeration system 113 at the bottom of the tank is further reduced due to the high efficiency of the "nucleus" aerobic granular sludge, and the air volume comes from the air blower 116 connected through the aerobic granular sludge air inlet pipe 128.

[0079] The semispherical microbial carrier filler 300 is an organic biological filler, and the filler has sufficient amount of denitrifying bacteria that can meet the needs of pollutant metabolism, can continuously exert the denitrification and nitrogen removal function under suitable conditions. The denitrifying bacteria on the semispherical microbial carrier filler 300 are firmly fixed inside the semispherical microbial carrier filler 300, and there is no problem of strain loss. The semispherical microbial carrier filler 300 can quickly realize granulation of sludge, and can complete the cultivation of mature aerobic granular sludge in a short time (generally within 30 days).

[0080] The unique shape of the hemispherical microbial carrier filler 300 and its characteristics, such as large specific surface area, moderate density, strong hydrophilicity and biological affinity, stable structure, good mechanical properties, good wear resistance, and difficulty in deformation, are applied to the aerobic granular sludge preparation system and method provided by the embodiment. Whether a continuous flow or a sequencing batch process is used, a "crystal nucleus" can be quickly formed and a good denitrification function can be continuously exerted. The semi-closed three-dimensional space formed by the hemispherical shape is conducive to the attachment and growth of functional bacteria such as phosphorus-removing bacteria and nitrifying bacteria, accelerates the rapid formation of aerobic granular sludge, and ensures the stability of the structure, thereby ensuring efficient carbon reduction, nitrogen removal, and phosphorus removal functions, and overcoming the risk of disintegration of general aerobic granular sludge technology after being impacted.

[0081] Optionally, the operation control of the air blower 116 and other equipment needs to be matched with the actual reaction condition requirements of the "crystal nucleus" aerobic granular sludge to ensure energy saving and consumption reduction of the overall technology.

[0082] Optionally, if a carbon source needs to be added during the actual reaction process of the "crystal nucleus" aerobic granular sludge, the medicament can be added through the feed ring to the water inlet pipeline before the sludge flocculation tank 103 or the aerobic granular sludge reaction tank 104.

[0083] The effluent of the aerobic granular sludge reaction tank 104 is discharged into the middle of the sludge selection tank 105 through the reaction tank effluent weir and the aerobic granular sludge reaction tank effluent pipe 122. The outlet of the aerobic granular sludge reaction tank effluent pipe 122 is distributed in the middle of the sludge selection tank 105, and can flow uniformly to the four sides. Different height sludge selection controllers are arranged in the middle and lower parts of the sludge selection tank 105, which promote the efficient separation of heavy sludge ("crystal nucleus" aerobic granular sludge) and light sludge (light sludge without "crystal nucleus" aerobic granular sludge) by flexibly adjusting different selection pressure conditions. Through the settling characteristics of the "crystal nucleus" aerobic granular sludge, sludge discharge ports are arranged at different heights in the sludge selection tank 5 to realize the separation of heavy sludge and light sludge. The heavy sludge is returned to the sludge flocculation tank 103 through the heavy sludge return system, reenters the biochemical reaction system (i.e., the aerobic granular sludge reaction module), and continuously exerts the function. The light sludge is discharged to the secondary sedimentation tank 106 through the sludge selection tank effluent port arranged in the upper part of the sludge selection tank 105 via the secondary sedimentation tank inlet pipe 123;

[0084] Specifically, the heavy sludge backflow system comprises a first heavy sludge backflow pipe 129 and a second heavy sludge backflow pipe 130 arranged at different heights in the sludge selection tank 105, and is connected with a first heavy sludge backflow air-lift pipe 133 and a second heavy sludge backflow air-lift pipe 134 respectively controlled by independent electric valves, the first heavy sludge backflow air-lift pipe 133 and the second heavy sludge backflow air-lift pipe 134 are connected with an air-lift main pipe 132 respectively, and the air-lift main pipe 132 is connected with an air compressor 117. The outlet ends of the first heavy sludge backflow pipe 129 and the second heavy sludge backflow pipe 130 are connected with a heavy sludge backflow main pipe 131.

[0085] By adjusting the arrangement heights of the first heavy sludge backflow pipe 129 and the second heavy sludge backflow pipe 130, the concentration of the backflow sludge can be controlled, and the particle size of the “crystal nucleus” aerobic granular sludge in the biochemical reaction system can be reasonably controlled, thereby further improving the stability of the system.

[0086] Specifically, the front end of the secondary sedimentation tank water inlet pipe 123 is provided with a selection tank filter screen 114 to ensure that the “crystal nucleus” aerobic granular sludge is controlled in the aerobic granular sludge reaction module, and the loss of the aerobic granular sludge is avoided. The secondary sedimentation tank sludge backflow main pipe 125 and the anaerobic tank sludge inlet pipe 126 adopt an air-lift mode, and are connected with the air-lift main pipe 132 through a backflow sludge air-lift pipe 135 respectively controlled by independent electric valves, and the air-lift main pipe 132 is connected with the air compressor 117.

[0087] In a specific embodiment, the secondary sedimentation tank 106 is provided with a secondary sedimentation tank effluent weir 115, and the outlet of the secondary sedimentation tank effluent weir 115 is connected with a secondary sedimentation tank effluent pipe 124. The secondary sedimentation tank effluent weir 115 is arranged on the side far away from the secondary sedimentation tank water inlet pipe 123 to avoid short flow. After the light sludge is discharged into the secondary sedimentation tank 106, the sedimentation separation is performed in the secondary sedimentation tank 106, a part of the sludge at the bottom of the tank is backflowed to the anaerobic tank 102 and the hydrolysis acidification tank 101 through the secondary sedimentation tank sludge backflow main pipe 125, the control valve, the anaerobic tank sludge inlet pipe 126 and the first hydrolysis acidification tank sludge inlet pipe 127 respectively, and the remaining sludge is discharged out of the system through a remaining sludge pipe 136. The supernatant obtained by the sedimentation separation in the secondary sedimentation tank 106 is used as the final effluent and is discharged out of the entire system through the secondary sedimentation tank effluent weir 115 and the secondary sedimentation tank effluent pipe 124.

[0088] Optionally, the secondary sedimentation tank 106 can adopt a vertical flow sedimentation tank or the like, and the sedimentation sludge can be backflowed to the anaerobic tank 102 and the hydrolysis acidification tank 101 to maintain the sludge concentrations in the two tanks, and the remaining sludge is discharged out of the system and transported to a concentration and dewatering device for further treatment.

[0089] In this embodiment, the application of the hemispherical microbial carrier filler 300 to form "nuclei" further improves the settling performance of the sludge, which is conducive to the efficient and stable operation of the entire aerobic granular sludge reaction module. By setting a sludge selection controller, heavy sludge can be returned to the sludge flocculation tank 103 by combining the heavy sludge return system, and light sludge can be discharged into the secondary sedimentation tank 106 through the upper water outlet. In order to avoid the loss of "nuclei" aerobic granular sludge, a filter screen 114 matched with the aerobic granular sludge is arranged at the inlet of the light sludge discharge pipe.

[0090] Optionally, the dosage of the hemispherical microbial carrier filler 300 for forming "nuclei" needs to be determined according to different types of wastewater, sludge concentration, and detailed design of the shape and size of the tank body.

[0091] Optionally, the sludge return is in the form of air lifting, and the return amount can be flexibly adjusted according to the operation needs, which can meet the needs of different engineering projects and also achieve energy saving and consumption reduction.

[0092] The embodiment also provides a continuous flow aerobic granular sludge water treatment method with filler addition, which is realized based on the continuous flow aerobic granular sludge water treatment system with filler addition, and the method comprises the following steps:

[0093] S1, pretreating wastewater: in the first hydrolysis acidification tank 101, acid-producing bacteria are used to decompose complex macromolecular substances in the wastewater into small molecular substances such as acetic acid, so as to fully utilize the carbon source in the raw water, improve the biodegradability of the wastewater, and reduce the potential toxicity of the influent;

[0094] S2, anaerobic carbon reduction and phosphorus removal: the hydrolyzed and acidified wastewater is fully mixed with the returned light sludge in the anaerobic tank 102, so as to achieve the degradation of organic matter and the anaerobic release of phosphorus;

[0095] S3, aerobic granular sludge reaction: after the wastewater after anaerobic carbon reduction and phosphorus removal is fully contacted with the returned heavy sludge in the sludge flocculation tank 103, it enters the aerobic granular sludge reaction tank 104, reacts with the uniformly dispersed aerobic granular sludge in the aerobic granular sludge reaction tank 104, and efficiently degrades the pollutants in the wastewater; the effluent of the aerobic granular sludge reaction tank 104 is discharged into the middle part of the sludge selection tank 105, and the sludge selection controller is used to promote the efficient separation of heavy sludge and light sludge, wherein the heavy sludge is returned to the sludge flocculation tank 103 to react with the wastewater, and the light sludge and the effluent after reaction are discharged into the secondary sedimentation tank 106;

[0096] The aerobic granular sludge adopts the semi-spherical microbial carrier filler 300 as a carrier core (a "crystal nucleus"), and realizes efficient carbon reduction, nitrogen removal and phosphorus removal by using different functional bacteria groups in the inner layer carrier microorganisms of the semi-spherical microbial carrier filler 300 and the sludge outside the semi-spherical microbial carrier filler 300, so that the effect of removing pollutants by the aerobic granular sludge reaction tank 104 can be improved. Meanwhile, the shape, size and structure of the aerobic granular sludge are stable, and the efficient carbon reduction, nitrogen removal and phosphorus removal functions can be ensured, and the technical problem that the general aerobic granular sludge technology is easy to disintegrate after being impacted can be overcome.

[0097] S4, sedimentation separation: the light sludge and the effluent after reaction are sedimented and separated in the secondary sedimentation tank 106, the supernatant obtained is discharged as the final effluent out of the system, and part of the sludge at the bottom of the tank is returned to the anaerobic tank 102 and the hydrolysis acidification tank 101, and the remaining sludge is discharged out of the system.

[0098] As shown in Figure 4 , 5 , the present application provides a sequencing batch aerobic granular sludge water treatment system with filler dosing, which comprises a second hydrolysis acidification tank and an effluent adjusting tank 201, a sequencing batch aerobic granular sludge reaction tank 202 in sequence along the water flow direction from the influent to the effluent of the wastewater to be treated, wherein:

[0099] The second hydrolysis acidification tank and the effluent adjusting tank 201 comprise a second hydrolysis acidification tank and an effluent adjusting tank, the second hydrolysis acidification tank adopts an upflow type reaction tank (the configuration of the second hydrolysis acidification tank is basically consistent with that of a continuous flow process), the lower part of the second hydrolysis acidification tank is designed with a second water distribution system 203, and the upper part of the second hydrolysis acidification tank is designed with a second hydrolysis acidification tank effluent weir, and the effluent is discharged into the effluent adjusting tank through the second hydrolysis acidification tank effluent weir. The second water distribution system 203 is connected with a second influent pump through a second hydrolysis acidification tank influent pipe 213, and the second influent pump is connected with a wastewater pool to be treated through an influent pipe. The lower part of the second hydrolysis acidification tank is connected with a second light sludge return pipe 225 to input the return light sludge.

[0100] The second hydrolysis acidification tank pre-treats the wastewater, decomposes complex macromolecular substances in the wastewater into small molecular substances such as acetic acid by using acid-producing bacteria, fully utilizes the carbon source in the raw water, improves the biodegradability of the wastewater and reduces the potential toxicity of the influent. After the effluent treated by the second hydrolysis acidification tank is discharged into the effluent adjusting tank through the hydrolysis acidification tank effluent weir, it is further sent to the subsequent biochemical treatment system according to the sequencing batch process.

[0101] In a specific embodiment, whether to fill soft or semi-soft filler in the second hydrolysis acidification tank can be further determined according to different project conditions.

[0102] The effluent adjusting tank is provided with a lifting pump 204, which, in combination with a lifting pump water inlet pipe 214 and a lifting pump water outlet pipe 215, lifts the effluent treated by the second hydrolysis acidification tank into the sequencing batch aerobic granular sludge reaction tank 202 according to the requirements of the sequencing batch process (such as process conditions of sequencing batch process treatment cycle timing).

[0103] Optionally, the number of the sequencing batch aerobic granular sludge reaction tank 202 is determined according to the influent and effluent water quality requirements of the engineering project and land use conditions, and can be single tank independent or multiple tanks in parallel. In a specific embodiment, three groups of sequencing batch aerobic granular sludge reaction tanks are used as shown in the figure. Figure 4

[0104] Specifically, the sequencing batch aerobic granular sludge reaction tank 202 is provided with a sequencing batch aerobic granular sludge reaction tank water inlet pipe 216 at the bottom, one end of which is connected to the lifting pump water outlet pipe 215, and the other end is connected to the third water distribution system 210. The water flow state in the sequencing batch aerobic granular sludge reaction tank 202 is upflow, with water inlet at the lower part and water outlet at the upper part.

[0105] The sequencing batch aerobic granular sludge reaction tank 202 is provided with an evenly distributed aerobic granular sludge reaction tank aeration system 211 at the lower part, wherein each aerobic granular sludge reaction tank aeration branch pipe 218 connected to the aeration head is connected to the large air volume air blower 205 and the small air volume air blower 206 through the aerobic granular sludge reaction tank aeration main pipe 217. By switching the operation of the large air volume air blower 205 and the small air volume air blower 206, the stirring and intermittent aeration of the sequencing batch aerobic granular sludge reaction tank 202 are realized to meet the metabolic function requirements of the aerobic granular sludge.

[0106] Specifically, based on the requirements of tank body stirring and intermittent aeration, the aerobic granular sludge reaction tank aeration system 211 adopts the mode of alternating use of large and small air blowers, which can maximize energy saving and consumption reduction.

[0107] ​The effluent weir groove 208 and the effluent groove 209 are uniformly arranged at the upper part of the sequencing batch aerobic granular sludge reaction tank 202, and the effluent of the sequencing batch aerobic granular sludge reaction tank 202 is discharged from the system through the effluent branch pipe 221 and the effluent main pipe 222. The sludge selection system 212 is arranged in the sequencing batch aerobic granular sludge reaction tank 202, and the light and heavy sludge is screened and separated, and the gas stripping device is combined to realize gas stripping and reflux of part of the light sludge to the second hydrolysis acidification tank. Each sequencing batch aerobic granular sludge reaction tank 202 is connected to the second light sludge reflux pipe 225 through the sludge reflux pipe 223 and the control valve, and the second light sludge reflux pipe 225 is connected to the second hydrolysis acidification tank. According to the periodic time sequence, the light sludge is discharged to the subsequent sludge concentration and dewatering system through the first light sludge reflux pipe 224. The sludge selection system 212 can realize the repeated washing of the sludge in the sequencing batch aerobic granular sludge reaction tank 202, and ensure that the high-quality heavy sludge has a certain particle size, which meets the requirements of carbon reduction, nitrogen removal and phosphorus removal. The valve of the sludge selection system 212 can realize automatic control.

[0108] Specifically, the gas stripping device includes a gas stripping reflux main pipe 219 and a gas stripping reflux branch pipe 220. The gas stripping reflux main pipe 219 is connected with the second air compressor 207 providing gas source. The gas stripping reflux branch pipe 220 is connected with the gas stripping reflux branch pipe 220 through a control valve. The gas stripping reflux branch pipe 220 is connected to the sludge reflux pipe 223 of each reaction tank. The light sludge is refluxed to the second hydrolysis acidification tank (the front end of the wastewater treatment system) under the action of the gas stripping reflux branch pipe 220, and the sludge concentration in the second hydrolysis acidification tank is supplemented. A filter screen is arranged at the inlet of the gas stripping reflux branch pipe 220, so as to ensure the minimum loss and the highest concentration of the “crystal nucleus” aerobic granular sludge.

[0109] Specifically, the sludge selection system 212 can realize automatic control. Through the sludge selection system 212, the selection pressure control condition can be constructed, the shape, particle size and structure of the “crystal nucleus” heavy sludge (aerobic granular sludge) are stabilized, and the light sludge is efficiently separated. Through the rapid granulation of the “crystal nucleus” aerobic granular sludge and stable operation, the water quality of the effluent system at the upper part of the sequencing batch aerobic granular sludge reaction tank 202 is greatly improved compared with the general aerobic granular sludge technology during the project start-up period and the operation period.

[0110] Specifically, in the sequencing batch aerobic granular sludge reaction tank 202, the “crystal nucleus” aerobic granular sludge is formed by adding the semispherical microbial filler 300, and the conditions required by the “selection pressure hypothesis” and the “extracellular polymeric substance hypothesis” are created, so as to realize the maximum exertion of the function of the aerobic granular sludge in the sequencing batch state.

[0111] The "crystal nucleus" aerobic granular sludge takes the semispherical microbial carrier filler 300 as the carrier nucleus, and uses different functional bacteria groups in the inner layer carrier microorganism of the semispherical microbial carrier filler 300 and the sludge outside the semispherical microbial carrier filler 300 to realize efficient carbon reduction, nitrogen removal and phosphorus removal, and further improve the pollutant removal effect of the sequencing batch aerobic granular sludge reaction tank 202.

[0112] The semispherical microbial carrier filler 300 is an organic biological filler, and the filler contains sufficient amount of denitrifying bacteria that can meet the needs of pollutant metabolism and can continuously exert the denitrification and nitrogen removal function under suitable conditions. The denitrifying bacteria on the semispherical microbial carrier filler 300 are firmly fixed inside the semispherical microbial carrier filler 300, and there is no problem of strain loss. The semispherical microbial carrier filler 300 has the unique shape and characteristics such as large specific surface area, moderate density, strong hydrophilicity and biological affinity, stable structure, good mechanical properties, good wear resistance and non-deformation, etc. When the semispherical microbial carrier filler 300 is applied to the aerobic granular sludge preparation system and method provided in the embodiment, whether a continuous flow or a sequencing batch process is used, the "crystal nucleus" can be quickly formed and continuously exert good denitrification function, and the semi-enclosed three-dimensional space formed by the semispherical shape is conducive to the attachment and growth of functional bacteria such as phosphorus removal bacteria and nitrifying bacteria, and accelerates the rapid formation of aerobic granular sludge and ensures the stability of the structure.

[0113] The embodiment also provides a sequencing batch aerobic granular sludge water treatment method with filler adding, which is realized based on the sequencing batch aerobic granular sludge water treatment system with filler adding, and the method comprises the following steps.

[0114] S1, pretreatment of wastewater: in the second hydrolysis acidification tank and the effluent adjusting tank 201, the acid-producing bacteria in the second hydrolysis acidification tank decompose complex macromolecular substances in the wastewater into small molecular substances such as acetic acid, so as to fully utilize the carbon source in the raw water, improve the biodegradability of the wastewater, and reduce the potential toxicity of the influent; the effluent after the treatment of the second hydrolysis acidification tank is discharged into the effluent adjusting tank, and then enters the sequencing batch aerobic granular sludge reaction tank 202 according to the sequencing batch process;

[0115] S2, aerobic granular sludge reaction: after the effluent after the treatment of the second hydrolysis acidification tank enters the sequencing batch aerobic granular sludge reaction tank 202, the effluent reacts with the uniformly dispersed aerobic granular sludge under the stirring action formed by the switching operation of the large and small blowers, and efficiently degrades the pollutants in the wastewater; then the sludge selection system 212 is used to screen and separate the light and heavy sludge, the gas stripping device is used to realize the gas stripping and reflux of part of the light sludge to the second hydrolysis acidification tank, and the light sludge is discharged to the subsequent sludge thickening and dewatering system according to the period time sequence; the effluent of the sequencing batch aerobic granular sludge reaction tank 202 is discharged as the final effluent.

[0116] The aerobic granular sludge adopts the semi-spherical microbial carrier filler 300 as a carrier core (crystal nucleus), and realizes efficient carbon reduction, nitrogen removal and phosphorus removal by using different functional bacteria groups in the inner layer carrier microorganism of the semi-spherical microbial carrier filler 300 and the outer sludge, so as to improve the pollutant removal effect of the sequencing batch aerobic granular sludge reaction tank 202. At the same time, the shape, size and structure of the aerobic granular sludge are stable, which can ensure the efficient carbon reduction, nitrogen removal and phosphorus removal function, and overcome the technical problem that the general aerobic granular sludge technology is easy to disintegrate after being impacted.

[0117] Embodiment:

[0118] The sequencing batch aerobic granular sludge water treatment system and method with filler are applied to a certain industrial park sewage treatment plant, and the types of drainage enterprises mainly include fluorine silicon new materials, electronic chemicals, lithium electric new energy, chips and sensors, intelligent equipment manufacturing, biological medicine and health, new energy, special paper, metal products, green food and the like. After the system runs stably, the pollutant treatment effect in the sewage is as shown in the table. Figures 7-10 The removal rate of COD in the sewage is 88-94%, the removal rate of ammonia nitrogen is 80-95%, the removal rate of TN is 65-80%, and the removal rate of TP is more than 90%.

[0119] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the claims of the present application and their equivalents, the present application also intends to include these modifications and variations.

Claims

1. A continuous-flow, granular sludge, aerobic, fillers-adding, water treatment system, characterized in that, The system comprises, in sequence along the water flow direction of the wastewater to be treated from the inlet to the outlet, a first hydrolytic acidification tank, an anaerobic tank, a sludge flocculation tank, an aerobic granular sludge reaction tank, a sludge selection tank, and a secondary sedimentation tank. The first hydrolytic acidification tank is an upflow reactor, and the lower part of the first hydrolytic acidification tank is designed with a first water distribution system, and the upper part is designed with a first hydrolytic acidification tank outlet weir, and the inlet of the first water distribution system is connected to the outlet of the first hydrolytic acidification tank inlet pipe. The first hydrolytic acidification tank is filled with soft or semi-soft filler. The anaerobic tank is provided with a high-speed mixer, and the outlet of the anaerobic tank is provided with an anaerobic tank filter screen; the sludge flocculation tank is provided with a flow guide cylinder, a low-speed mixer, and a carbon source adding ring, one end of the sludge flocculation tank inlet pipe is connected to the outlet of the anaerobic tank, and the other end is connected to the inlet of the flow guide cylinder. The aerobic granular sludge reaction tank is provided with a uniformly distributed microporous aeration system at the lower part, and the aerobic granular sludge reaction tank is uniformly dispersed with aerobic granular sludge, and the aerobic granular sludge takes a hemispherical microbial carrier filler as the carrier core; the outlet of the aerobic granular sludge reaction tank is distributed in the middle of the sludge selection tank, and sludge selection controllers with different heights and a heavy sludge backflow system are arranged in the middle and lower parts of the sludge selection tank; the upper part of the sludge selection tank is provided with a sludge selection tank outlet; the heavy sludge backflow system is connected to the sludge flocculation tank inlet pipe through a heavy sludge backflow main pipe. The hemispherical microbial carrier filler is an organic biological filler, and the hemispherical microbial carrier filler contains denitrifying bacteria required for pollutant metabolism; the denitrifying bacteria on the hemispherical microbial carrier filler are firmly fixed inside the hemispherical microbial carrier filler. The secondary sedimentation tank is provided with a secondary sedimentation tank inlet pipe, a secondary sedimentation tank outlet weir, and a secondary sedimentation tank sludge backflow main pipe, the secondary sedimentation tank inlet pipe is connected to the sludge selection tank outlet, and the front end of the secondary sedimentation tank inlet pipe is provided with a selection tank filter screen; the secondary sedimentation tank outlet weir is connected to a secondary sedimentation tank outlet pipe; the secondary sedimentation tank sludge backflow main pipe is connected to the anaerobic tank and the first hydrolytic acidification tank inlet pipe through an anaerobic tank sludge inlet pipe and a first hydrolytic acidification tank sludge inlet pipe, respectively.

2. The continuous-flow granular sludge system according to claim 1, wherein, The system further comprises a first inlet pump, and the first inlet pump inlet pipe is connected to the wastewater tank to be treated, and the first inlet pump outlet pipe is connected to the inlet of the first hydrolytic acidification tank inlet pipe. The first hydrolytic acidification tank sludge inlet pipe is connected to the middle part of the first hydrolytic acidification tank inlet pipe.

3. The continuous-flow granular sludge system according to claim 1, wherein the system is characterized by, The inlet and outlet of the anaerobic tank are staggered in the vertical direction, and the outlet of the anaerobic tank is arranged on the side away from the inlet of the anaerobic tank. The high-speed mixer is a submersible mixer. The heavy sludge backflow main pipe is in communication with the middle part of the sludge flocculation tank inlet pipe.

4. The continuous flow aerobic granular sludge water treatment system with added packing material according to claim 1, characterized in that, The microporous aeration system is connected to a blower through an aerobic granular sludge air inlet pipe. The outlet of the aerobic granular sludge reaction tank is discharged into the middle of the sludge selection tank through a reaction tank outlet weir and the aerobic granular sludge reaction tank outlet pipe. The aerobic granular sludge reaction tank is a plug flow or complete mixing type. The aerobic granular sludge reaction tank is a single tank or multiple tanks.

5. A continuous flow aerobic granular sludge water treatment system with added packing material according to claim 1, characterized in that, According to different wastewater types, sludge concentration, and shape and size of the pool body of the aerobic granular sludge reaction tank, the amount of the semi-spherical microbial carrier filler is determined.

6. A continuous flow aerobic granular sludge water treatment system with added packing material according to claim 1, characterized in that, The heavy sludge reflux system comprises a first heavy sludge reflux pipe and a second heavy sludge reflux pipe arranged at different heights in the sludge selection tank, and is connected with a first heavy sludge reflux air-lift pipe and a second heavy sludge reflux air-lift pipe controlled by independent electric valves respectively; The first heavy sludge reflux air-lift pipe and the second heavy sludge reflux air-lift pipe are connected with an air-lift main pipe, and the air-lift main pipe is connected with an air compressor; The outlet ends of the first heavy sludge reflux pipe and the second heavy sludge reflux pipe are connected with the heavy sludge reflux main pipe; The sludge reflux main pipe of the secondary sedimentation tank and the sludge inlet pipe of the anaerobic tank are connected with the air-lift pipe through the air-lift pipe controlled by independent electric valves.

7. A continuous-flow aerobic granular sludge water treatment process with dosing of fillers, characterized by, The method is realized based on the continuous flow aerobic granular sludge water treatment system with filler according to any one of claims 1-6, and the method comprises the following steps: S1, pretreating wastewater: in the first hydrolysis acidification tank, complex macromolecular substances in wastewater are decomposed into small molecular substances by acid-producing bacteria to obtain hydrolysis acidified wastewater; S2, anaerobic carbon reduction and phosphorus removal: the hydrolysis acidified wastewater is fully mixed with the refluxed light sludge in the anaerobic tank to obtain wastewater after anaerobic carbon reduction and phosphorus removal; S3, aerobic granular sludge reaction: the wastewater after anaerobic carbon reduction and phosphorus removal is fully contacted with the refluxed heavy sludge in the sludge flocculation tank, and then enters the aerobic granular sludge reaction tank to react with the uniformly dispersed aerobic granular sludge therein; the effluent of the aerobic granular sludge reaction tank is discharged into the middle of the sludge selection tank, and the sludge selection controller is used to promote the efficient separation of the heavy sludge and the light sludge, wherein the heavy sludge is refluxed to the sludge flocculation tank to react with the wastewater, and the light sludge and the effluent after reaction are discharged to the secondary sedimentation tank; S4, sedimentation and separation: the light sludge and the effluent after reaction are sedimented and separated in the secondary sedimentation tank, and the obtained supernatant is discharged as the final effluent; part of the sludge at the bottom of the secondary sedimentation tank is refluxed to the anaerobic tank and the hydrolysis acidification tank, and the remaining sludge is discharged out of the system.

8. A sequencing batch aerobic granular sludge water treatment system with dosing of filler, characterized in that The system comprises, in sequence along the water flow direction from the wastewater inlet to the effluent, a second hydrolysis acidification tank and an effluent adjusting tank, and a sequencing batch aerobic granular sludge reaction tank, wherein: The second hydrolysis acidification tank and the effluent adjusting tank comprise a second hydrolysis acidification tank and an effluent adjusting tank; the second hydrolysis acidification tank is an upflowing reaction tank, the lower part of the second hydrolysis acidification tank is provided with a second water distribution system, and the upper part of the second hydrolysis acidification tank is provided with a second hydrolysis acidification tank effluent weir; the lower part of the second hydrolysis acidification tank is connected with a second light sludge reflux pipe; a booster pump is arranged in the effluent adjusting tank, and the booster pump is connected with a booster pump inlet pipe and a booster pump outlet pipe to lift the effluent of the second hydrolysis acidification tank into the sequencing batch aerobic granular sludge reaction tank according to the needs of the sequencing batch process; The second water distribution system is connected with a second inlet pump through a second hydrolysis acidification tank inlet pipe, the second inlet pump inlet pipe is connected with a wastewater tank, and according to different project conditions, it is determined whether to fill soft or semi-soft filler in the second hydrolysis acidification tank. The water flow state in the sequencing batch aerobic granular sludge reaction tank is upflow type, the bottom of the sequencing batch aerobic granular sludge reaction tank is provided with a sequencing batch aerobic granular sludge reaction tank water inlet pipe and a third water distribution system, the inlet of the sequencing batch aerobic granular sludge reaction tank water inlet pipe is connected to the outlet of the lifting pump water outlet pipe, and the outlet is connected to the third water distribution system; the lower part of the sequencing batch aerobic granular sludge reaction tank is provided with an evenly distributed aerobic granular sludge reaction tank aeration system; the upper part of the sequencing batch aerobic granular sludge reaction tank is uniformly provided with a water outlet weir groove and a water outlet groove; the sequencing batch aerobic granular sludge reaction tank is provided with a sludge selection system, and the sequencing batch aerobic granular sludge reaction tank is connected to the second light sludge return pipe through a sludge return pipe and a control valve; The selection pressure control condition is constructed through the sludge selection system, so as to promote the shape, particle size and structure stability of the aerobic granular sludge, and separate the light sludge; The sequencing batch aerobic granular sludge reaction tank is uniformly dispersed with aerobic granular sludge, and the aerobic granular sludge takes a hemispherical microbial carrier filler as the core of the carrier; The hemispherical microbial carrier filler is an organic biological filler, and the hemispherical microbial carrier filler contains denitrifying bacteria required for the metabolism of pollutants; the denitrifying bacteria on the hemispherical microbial carrier filler are firmly fixed inside the hemispherical microbial carrier filler.

9. The sequencing batch granular aerobic sludge process with filling according to claim 8, characterized in that, The sequencing batch aerobic granular sludge reaction tank adopts single-tank independent or multi-tank parallel connection; The aerobic granular sludge reaction tank aeration branch pipes connected with each aeration head in the aerobic granular sludge reaction tank aeration system are connected with a large air volume air blower and a small air volume air blower through an aerobic granular sludge reaction tank aeration main pipe; the stirring and intermittent aeration of the sequencing batch aerobic granular sludge reaction tank are realized through the switching operation of the large air volume air blower and the small air volume air blower.

10. A granular sludge sequencing batch aerobic process for water treatment with dosing of filler, characterized by, The method is realized based on the sequencing batch aerobic granular sludge water treatment system with filler according to any one of claims 8-9, and the method comprises the following steps: S1, pretreating wastewater: in the second hydrolysis acidification tank and the water outlet adjusting tank, complex macromolecular substances in the wastewater are decomposed into small molecular substances by acid-producing bacteria in the second hydrolysis acidification tank, the hydrolyzed and acidified wastewater is discharged into the water outlet adjusting tank, and the wastewater is introduced into the sequencing batch aerobic granular sludge reaction tank according to the sequencing batch process; S2, aerobic granular sludge reaction: after the hydrolyzed and acidified wastewater enters the sequencing batch aerobic granular sludge reaction tank, the wastewater reacts and degrades pollutants in the wastewater under the stirring action formed by the switching operation of the large and small air blowers and the uniformly dispersed aerobic granular sludge in the sequencing batch aerobic granular sludge reaction tank; Then, the light and heavy sludge are screened and separated through the sludge selection system, the light sludge is returned to the second hydrolysis acidification tank through the air stripping device, the light sludge is discharged to a subsequent sludge thickening and dewatering system according to the cycle time sequence, and the water produced by the sequencing batch aerobic granular sludge reaction tank is discharged as the final effluent.

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