Magnetic porous carrier induced nucleation coupling cyclone separation reinforced granular sludge technology for improving quality and efficiency of sewage

Abstract

The invention belongs to the technical field of sewage treatment, and discloses a magnetic porous carrier induced nucleation coupling cyclone separation reinforced granular sludge technology for improving quality and efficiency by applying sewage, which comprises the following steps: (1) wastewater is pretreated and then enters a biochemical treatment unit; (2) mixing the magnetic porous carrier with activated sludge in an aerobic tank, stirring and inoculating, and entering the aerobic tank of a biochemical treatment unit; (3) uniformly mixing the wastewater, the magnetic porous carrier and the activated sludge in an aerobic tank; (4) carrying out sludge-water separation on the discharged wastewater-sludge mixed solution in a secondary sedimentation tank, and discharging the supernate after flowing into a subsequent treatment unit; and (5) high-efficiency separation of the non-magnetic light sludge and the magnetic heavy sludge is realized under the action of a magnetic field and centrifugal force. The technology integration solves the problems of difficult formation of granulated sludge, slow growth of a carrier biological membrane and the like in a continuous flow process, can be used for in-situ upgrading and capacity expansion of a sewage treatment plant, and solves the problems of large occupied area, long construction period, high investment cost and the like in other upgrading and capacity expansion methods.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a magnetic porous carrier-induced nucleation coupled cyclone separation enhanced granular sludge technology that improves wastewater quality and efficiency. Background Technology

[0002] Currently, the main technologies used in wastewater treatment plants in my country are A. 2 Processes such as oxidation ditch and SBR typically suffer from problems such as insufficient influent carbon source, high influent load, insufficient microbial activity, and poor microbial resistance to shock loads. This situation is particularly severe in some mixed industrial and domestic wastewater treatment plants. To meet the requirements of microbial nitrogen and phosphorus removal, extensive operating methods such as high aeration and high external carbon source are usually required to achieve stable compliance with carbon, nitrogen, and phosphorus standards in the effluent. This results in problems such as large reagent dosages and high operating costs. Currently, wastewater treatment plants urgently need to optimize their processes to improve treatment efficiency and reduce operating costs.

[0003] To address this issue, increasing the concentration of activated sludge and the diversity of microbial communities within existing wastewater treatment plant structures to enhance biochemical efficiency and achieve in-situ improvement of wastewater treatment plant quality and efficiency is the mainstream trend. Commonly used MBBR (Multi-Mechanical Batch Reactor) technology suffers from problems such as small specific surface area of ​​packing materials, poor mixing due to localized packing material accumulation, and high energy consumption for aeration and oxygenation. High-concentration powder carrier biological fluidized bed (MBB) technology, by introducing powder carriers (diatomaceous earth, bentonite, attapulgite, etc.) into the biological treatment tank to induce the formation of microorganisms with strong adhesion around the powder carrier core, thereby increasing the diversity of the microbial community. This approach can achieve "dual sludge age" based on the "dual sludge method," simultaneously improving nitrogen and phosphorus removal efficiency. Aerobic granular sludge consists of spherical particles formed by the self-immobilization of various microorganisms. In a high-concentration powder carrier fluidized bed, the powder carrier acts as the center, and the extracellular polymers secreted by the microorganisms enhance their adhesion and aggregation, encapsulating the carrier and creating a distinct dissolved oxygen concentration gradient from the outer layer to the inner layer. This unique stratified structure allows for the symbiotic coexistence of microorganisms with different functional types within the granular sludge, enabling the effective removal of carbon, nitrogen, and phosphorus simultaneously. This improves system treatment efficiency, reduces energy consumption, and results in a significantly higher sludge settling rate compared to conventional activated sludge. The formation of aerobic granular sludge depends on selective pressure. Hydrocyclones can use selective pressure to screen out light or dispersed flocculent sludge from the reactor, while heavier aggregates, enriched with dominant microorganisms, return to the biological treatment tank to absorb more nutrients, further agglomerating and growing into dense granules. Therefore, using a hydrocyclone connected to a high-concentration powder carrier fluidized bed, with the powder carrier at the center, to gradually form aerobic granular sludge is an effective method for in-situ quality improvement and efficiency enhancement in wastewater treatment plants.

[0004] However, in the process of separating and recovering powder carriers from sludge after sludge-water separation in the secondary sedimentation tank, the hydrocyclone mainly recovers powder carriers based on the density difference between the powder carrier particles and the bioflocs. This results in low recovery efficiency for low-density, small-particle-size powder carriers. Furthermore, it is difficult to separate the powder carriers from the bioflocs using only centrifugal force. Consequently, the demand for powder carrier replenishment is large during the operation of the project, leading to high operating costs. Summary of the Invention

[0005] The magnetic porous carrier-induced nucleation coupled cyclone separation enhanced granular sludge technology utilizes the excellent magnetic responsiveness of magnetic powder carriers. By applying an external magnetic field to a hydrocyclone, it can effectively improve the carrier recovery efficiency, reduce carrier loss and replenishment, enhance the separation effect of light and heavy sludge, improve the settling performance of sludge in the biological treatment tank, further promote the sludge granulation process, and achieve in-situ quality improvement and efficiency enhancement of the sewage treatment system.

[0006] The magnetic porous carrier-induced nucleation coupled cyclone separation enhanced granular sludge technology combines magnetic materials with granulated biological sludge, providing a new, efficient, simple, and environmentally friendly method for wastewater treatment. Due to the carrier's characteristics such as micro-electrolysis, magnetic responsiveness, and high specific surface area, the magnetic biochemical technology based on magnetic porous carriers can significantly improve the degradation efficiency of organic pollutants. It can enhance treatment capacity and improve quality and efficiency without increasing existing system structures by increasing sludge concentration and biochemical treatment efficiency. It achieves low-carbon operation of wastewater treatment plants and stable effluent compliance with standards with lower phosphorus removal agent and carbon source usage. Simultaneously, the magnetic porous carrier can induce microorganisms to secrete extracellular polymers, enhancing microbial adhesion and aggregation. Combined with the selective pressure conditions provided by the hydrocyclone, the magnetic granular sludge, with the carrier as its core, gradually forms anaerobic, anoxic, and aerobic zones outwards. Different functional types of microorganisms coexist on the carrier, simultaneously undergoing nitrification, denitrification, and phosphorus removal, achieving effective removal of carbon, nitrogen, and phosphorus. This technology can improve the recovery efficiency of magnetic carriers and reduce carrier loss in the cyclone separation and magnetic separation recovery process of magnetic granular sludge, thereby further reducing costs and increasing efficiency. It is of great significance for the in-situ upgrading and efficiency improvement of existing sewage treatment processes.

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a magnetic porous carrier-induced nucleation coupled cyclone separation enhanced granular sludge technology for improving the quality and efficiency of wastewater treatment. This technology solves problems such as low nitrogen and phosphorus removal efficiency, large carbon source consumption, low denitrification efficiency, sludge age contradiction between nitrifying bacteria and phosphorus removal bacteria, easy sludge expansion, and large footprint in traditional urban wastewater treatment plant processes. At the same time, it can achieve efficient sorting of dominant bacterial groups and stability of granular sludge under continuous flow conditions. It can reduce wastewater treatment costs and increase efficiency through in-situ modification of wastewater treatment plants.

[0008] To achieve the objectives of this invention, the present invention utilizes a magnetic porous carrier-induced nucleation coupled cyclone separation technology to enhance granular sludge quality and efficiency, comprising the following steps: (1) Wastewater is pretreated to remove solid suspended pollutants before entering the biochemical treatment unit; (2) The magnetic porous carrier is mixed with the activated sludge in the aerobic tank to prepare a sludge mixture, which is then fully stirred and inoculated before entering the aerobic tank of the biochemical treatment unit. (3) Wastewater, magnetic porous carrier and activated sludge are uniformly mixed in the aerobic tank; As a microbial metabolism promoter and magnetic induction medium, after loading activated sludge microorganisms, the magnetic porous carrier, with the magnetic porous carrier as the core, can significantly enhance the metabolic activity of microorganisms and the expression of related enzyme genes through the surface charge neutralization and slow-release iron ion effect, thereby promoting a significant increase in the secretion of viscous polysaccharides and proteins, and finally achieving the efficient aggregation and granular structure of loose bacterial flocs, while improving the treatment efficiency of the entire biochemical system. (4) The wastewater and sludge mixture discharged from the biochemical treatment unit is separated into mud and water in the secondary sedimentation tank, and the supernatant flows into the subsequent deep treatment unit for treatment and discharge after meeting the standards. The magnetic sludge flocs in the sedimentation tank are a composite of sludge and magnetic porous carrier. Part of them are returned to the inlet of the aerobic tank of the biological treatment unit, and the other part is pumped into the cyclone separator for the recovery of magnetic porous carrier and heavy sludge. (5) The hydrocyclone separator is a hydrocyclone separator with an external magnet. It uses the synergistic effect of magnetic field and centrifugal force to achieve efficient separation of non-magnetic light sludge and magnetic heavy sludge. At the same time, it promotes the magnetic heavy sludge to form granular sludge under shear selection pressure. The magnetic heavy sludge enters the aerobic tank through the bottom outlet of the hydrocyclone separator, and the non-magnetic light sludge is discharged through the overflow outlet of the hydrocyclone separator. This realizes the recovery of magnetic heavy sludge and uses the magnetic linkage effect of residual magnetism to enhance the structural stability of granular sludge.

[0009] Furthermore, in some embodiments of the present invention, the pretreatment in step (1) is a physical method of removing suspended solids from wastewater by bar filtration and coagulation sedimentation.

[0010] Furthermore, in some embodiments of the present invention, the magnetic porous carrier in step (2) has a mesh size of 250-350 and a specific surface area of ​​100-200 m². 2 / g, with a magnetic material content of 75-90% and a moisture content controlled at 0.5-5%.

[0011] Furthermore, in some embodiments of the present invention, the sludge mixture prepared by mixing the magnetic porous carrier and sludge in step (2) is stirred in a stirring tank and the concentration is 1-5%.

[0012] Furthermore, in some embodiments of the present invention, after the sludge mixture is prepared in step (2), it is pumped into the inlet of the aerobic tank of the biochemical treatment unit by a submersible pump.

[0013] Furthermore, in some embodiments of the present invention, in step (3), the initial dosage of the magnetic porous carrier in the aerobic tank is 0.5-0.7 g / L, the dissolved oxygen in the aerobic tank is controlled at 2-4 mg / L, and the sludge concentration in the aerobic tank is 5500-8000 mg / L.

[0014] Furthermore, in some embodiments of the present invention, the sludge mixture discharged from the aerobic tank of the biochemical treatment unit in step (4) settles by gravity in the secondary sedimentation tank.

[0015] Furthermore, in some embodiments of the present invention, in step (4), a portion of the composite of sludge and magnetic porous carrier is returned to the inlet of the aerobic tank by a sludge return pump, with a return ratio of 50-150%.

[0016] Furthermore, in some embodiments of the present invention, the magnetic separation device in step (4) consists of a dosing tank, a mixer, a submersible pump and a cyclone separator.

[0017] The dosing tank and mixer are used in step (2) to mix the magnetic porous carrier with the sludge to prepare a sludge mixture.

[0018] The submersible pump is used in step (4) to allow the composite of sludge and magnetic carrier to enter the cyclone separator.

[0019] The cyclone separator is used in step (5) to achieve efficient separation of non-magnetic light sludge and magnetic heavy sludge and to promote the stability of granular sludge.

[0020] Furthermore, in some embodiments of the present invention, the feed pressure of the cyclone separator in step (5) is 0.2-0.3 MPa.

[0021] Furthermore, in some embodiments of the present invention, the ratio of the underflow and overflow flow rates of the cyclone separator in step (5) is 1:3-5.

[0022] Compared with the prior art, the advantages of the present invention are as follows: (1) The technology of the present invention can be used to upgrade the process of sewage treatment plants and achieve on-site upgrading and expansion, which solves the problems of large land area, difficulty in land acquisition, long project construction period and high investment cost in other upgrading and expansion methods.

[0023] (2) The magnetic porous carrier involved in this invention can induce a dense aggregate structure that combines the advantages of activated sludge and granular sludge. The zero-valent iron and iron sulfide contained therein can act as electron donors to enhance the metabolic capacity of microorganisms, which helps to enrich functional microorganisms and improve sludge activity, thereby strengthening the denitrification and phosphorus removal capacity.

[0024] (3) The hydrocyclone separation device involved in this invention uses a permanent magnet set on the outside of the hydrocyclone to increase the magnetic force on the magnetic sludge flocs and magnetic porous carriers. The magnetic field and centrifugal force work together to achieve efficient separation of non-magnetic light sludge and magnetic heavy sludge. At the same time, the magnetic heavy sludge is promoted to form granular sludge under shear selection pressure and residual magnetic self-aggregation.

[0025] (4) This invention uses a hydrocyclone separator with an external permanent magnet to allow magnetic heavy sludge to enter the aerobic tank through the underflow port of the hydrocyclone separator, while non-magnetic light sludge is discharged as excess sludge through the overflow port of the hydrocyclone separator. This achieves the recovery of magnetic sludge flocs and granular sludge, reducing the loss of magnetic porous carriers and lowering operating costs. This integrated technology effectively solves the problems of difficult granular sludge formation and slow biofilm growth in continuous flow processes, and has significant technical feasibility and economic advantages in the upgrading and transformation of wastewater treatment plants. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall process flow according to an embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram showing the changes in pollutants in the influent and effluent of the treatment facility in Example 1.

[0028] Figure 3 This is a schematic diagram showing the changes in pollutants in the influent and effluent of the treatment facility in Example 2.

[0029] Figure 4 This is a microscopic image of the sludge from Example 2.

[0030] Figure 5 This is a schematic diagram showing the changes in pollutants in the influent and effluent of the treatment facility in Example 3.

[0031] Figure 6 This is a schematic diagram of the sludge concentration change in the treatment facility of Example 3. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. It should be understood that the following description is merely illustrative and not intended to limit the invention.

[0033] The terms “comprising,” “including,” “having,” “containing,” or any other variations thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that includes the listed elements is not necessarily limited to those elements, but may include other elements not expressly listed or elements inherent to such composition, step, method, article, or apparatus.

[0034] The indefinite articles “a” and “an” preceding an element or component of this invention do not impose any limitation on the quantity (i.e., number of times) of the element or component. Therefore, “an” or “a” should be interpreted as including one or at least one, and the singular form of an element or component also includes the plural form, unless the quantity clearly refers only to the singular form.

[0035] Furthermore, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., described below refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms are not necessarily directed at the same embodiment or example. Moreover, the technical features involved in the various embodiments of the present invention can be combined with each other as long as they do not conflict with each other.

[0036] The overall process flow diagram of this invention is shown in the attached figure. Figure 1 As shown, the biochemical treatment unit is sequentially equipped with an anaerobic tank, an anoxic tank, an aerobic tank, and a post-anoxic tank. The magnetic porous carrier is added by mixing the magnetic porous carrier with activated sludge from the aerobic tank to prepare a sludge mixture. This mixture is stirred in a mixing tank to a concentration of 1-5%. The mixture is then pumped into the inlet of the aerobic tank of the biochemical treatment unit via a submersible pump using a magnetic separator. Within the biochemical treatment unit, the magnetic sludge flocs with the activated sludge form a dense aggregate structure. After sludge-water separation in the secondary sedimentation tank, the bottom sedimented sludge is pumped from the secondary sedimentation tank to a cyclone separator. The magnetic heavy sludge enters the aerobic tank through the underflow port of the cyclone separator, while the non-magnetic light sludge is discharged as excess sludge through the overflow port of the cyclone separator, thus achieving the recovery of the magnetic heavy sludge. Simultaneously, the magnetic heavy sludge is subjected to shear selection pressure to form granular sludge.

[0037] Example 1 The production-scale test of magnetic porous support-induced nucleation coupled cyclone separation adopted an independent 1000 t / d processing system, which consists of a 108 m³ volumetric cyclone separator. 3 The biochemical treatment unit and a 90m³ volume 3 It consists of a secondary sedimentation tank with a total volume of 198m³. 3After the biochemical system had been acclimatized and cultured with inoculated sludge for more than 30 days and was running stably, in order to improve the system's wastewater treatment capacity and nitrogen and phosphorus removal efficiency, 120 kg of magnetic porous carrier was added in batches for enhanced biochemical nitrogen and phosphorus removal. The magnetic porous carrier had a mesh size of 300 mesh and a specific surface area of ​​120 m². 2 The magnetic porous carrier has a content of 84% magnetic material and a water content of 4%. The influent is filtered through a screen to remove suspended solids. The magnetic porous carrier is then mixed with sludge to prepare a sludge mixture with a concentration of 4%, which is pumped into the influent of the aerobic tank in the biological treatment unit via a submersible pump. The initial dosage of the magnetic porous carrier in the aerobic tank is 0.6 g / L, the dissolved oxygen in the aerobic tank is controlled at 3 mg / L, and the sludge concentration in the aerobic tank is 5500 mg / L. Part of the sludge and magnetic porous carrier composite is returned to the influent of the aerobic tank via a sludge return pump (100% return ratio); the other part is pumped into a cyclone separator for the recovery of the magnetic porous carrier and heavy sludge. The feed pressure of the cyclone separator is 0.3 MPa, and the ratio of underflow to overflow flow rate is 1:3.3. The experimental results before and after the addition of the magnetic porous carrier are shown in Table 1, and a schematic diagram of the changes in pollutants in the influent and effluent is attached. Figure 2 .

[0038] Table 1. Changes in wastewater quality before and after treatment Example 2 In addition, a separate 1000t / d river overflow water treatment system was selected as a technology verification platform for magnetic porous carrier-induced nucleation coupled cyclone separation to enhance granular sludge treatment. The equipment consists of a 108m³ volume... 3 The biochemical treatment unit and a 90m³ volume 3 It consists of a secondary sedimentation tank, with a total equipment volume of 198m³. 3 After 40 days of stable culture with inoculated sludge, 100 kg of magnetic porous carrier was added for further cultivation to verify the enhanced nitrogen and phosphorus removal capabilities of the magnetic porous carrier. The magnetic porous carrier used had a mesh size of 280 mesh and a specific surface area of ​​130 m². 2The magnetic porous carrier has a content of 86% magnetic material and a moisture content of 2%. The influent is filtered through a screen to remove suspended solids. The magnetic porous carrier is then mixed with sludge to prepare a sludge mixture with a concentration of 3.5%, which is pumped into the influent of the aerobic tank in the biological treatment unit via a submersible pump. The initial dosage of the magnetic porous carrier in the aerobic tank is 0.5 g / L, the dissolved oxygen in the aerobic tank is controlled at 3.5 mg / L, and the sludge concentration in the aerobic tank is 5700 mg / L. A portion of the sludge and magnetic porous carrier composite is returned to the inlet of the aerobic tank via a sludge return pump, with a return ratio of 100%. The other portion enters a cyclone separator via a submersible pump. The cyclone separator is equipped with a permanent magnet arranged spirally downwards in the same direction as the hydraulic cyclone, with a magnetic induction intensity of 2500 Gauss. The cyclone separator with the added permanent magnet enhances the recovery of both the magnetic porous carrier and heavy sludge. The feed pressure of the cyclone separator is 0.3 MPa, and the ratio of underflow to overflow flow rate is 1:3.5. The experimental results before and after the addition of the magnetic porous carrier are shown in Table 2, and a schematic diagram of the changes in pollutants in the influent and effluent is attached. Figure 3 Microscopic examination of sludge after 70 days of acclimatization and cultivation with magnetic porous carriers is shown in the attached figure. Figure 4 .

[0039] Table 2. Changes in wastewater quality before and after treatment Example 3 Further, a 100t / d wastewater treatment system was designed and manufactured according to the anaerobic-anoxic-aerobic process as a technical verification platform for magnetic porous carrier-induced nucleation coupled cyclone separation to enhance granular sludge treatment. The equipment consists of a biochemical treatment unit (containing a volume of 4.5m³). 3 The anaerobic tank has a volume of 14.4 m³. 3 The anoxic pool has a volume of 25.2 m³. 3 The aerobic tank has a volume of 8.1 m³. 3 (The post-anoxic pool) and a 16.8m³ volume pool. 3 It consists of a secondary sedimentation tank, with a total equipment volume of 69m³. 3 After 20 days of stable culture with inoculated sludge, 40 kg of magnetic porous carrier was added for further cultivation to verify the carrier's ability to enhance the treatment effect of the equipment. The magnetic porous carrier used had a mesh size of 280 mesh and a specific surface area of ​​115 m². 2The wastewater contained 85% magnetic material and 3% water. The influent was filtered through a screen to remove suspended solids. Magnetic porous carriers were mixed with sludge to prepare a sludge mixture at a concentration of 5%, which was pumped into the aerobic tank of the biological treatment unit via a submersible pump. The initial dosage of magnetic porous carriers in the aerobic tank was 0.58 g / L, the dissolved oxygen was controlled at 2.5 mg / L, and the sludge concentration in the aerobic tank was 7900 mg / L. Part of the sludge and magnetic porous carrier composite was returned to the aerobic tank influent via a sludge return pump (90% return ratio); the other part was pumped into a cyclone separator for the recovery of magnetic porous carriers and heavy sludge. The feed pressure of the cyclone separator was 0.25 MPa, and the ratio of underflow to overflow flow rate was 1:3.5. The experimental results before and after the addition of magnetic porous carriers are shown in Table 3, and a schematic diagram of the changes in pollutants in the influent and effluent is attached. Figure 5 See attached diagram for sludge concentration changes. Figure 6 .

[0040] Table 3. Changes in wastewater quality before and after treatment Those skilled in the art will readily understand that the above description is only a part of the embodiments of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A magnetic porous carrier induced nucleation coupling cyclone separation enhanced granular sludge technology applied to sewage upgrading and synergism, characterized in that, The magnetic porous carrier induced nucleation coupling cyclone separation reinforced granular sludge technology comprises the following steps: (1) The wastewater is pretreated to remove solid suspended pollutants and enters a biochemical treatment unit; (2) The magnetic porous carrier is mixed with the activated sludge in the aerobic tank to prepare a sludge mixture, which is inoculated by sufficient stirring and then enters the aerobic tank of the biochemical treatment unit; (3) The wastewater, the magnetic porous carrier and the activated sludge are uniformly mixed in the aerobic tank; (4) The wastewater sludge mixture discharged from the biochemical treatment unit is subjected to sludge-water separation in a sedimentation tank, and the supernatant flows into a subsequent advanced treatment unit for treatment and then is discharged after reaching the standard; The magnetic sludge floc in the sedimentation tank is a composite of sludge and magnetic porous carrier, part of which is backflowed to the front end of the influent of the aerobic tank of the biochemical treatment unit, and the other part is introduced into a cyclone separation device by a submerged sludge pump for recycling of the magnetic porous carrier and heavy sludge; (5) The cyclone separation device is a hydrocyclone separator with an external permanent magnet, which realizes efficient separation of non-magnetic light sludge and magnetic heavy sludge by the synergistic effect of magnetic field and centrifugal force, and at the same time promotes the formation of granular sludge under the shear selection pressure of the magnetic heavy sludge; The magnetic heavy sludge enters the aerobic tank through the underflow port of the hydrocyclone separator, and the non-magnetic light sludge is discharged through the overflow port of the cyclone separation device, so as to realize the recycling of the magnetic heavy sludge and utilize the magnetic chain effect of the residual magnetism to strengthen the structural stability of the granular sludge.

2. The magnetic porous carrier induced nucleation coupling cyclonic separation enhanced granular sludge technology for upgrading and synergizing sewage application according to claim 1, characterized in that, The pretreatment in step (1) is a physical method of removing solid suspended matter in wastewater by grid filtration and coagulation sedimentation.

3. The magnetic porous carrier induced nucleation coupling cyclonic separation enhanced granular sludge technology for upgrading and synergizing sewage application according to claim 1, characterized in that, The magnetic porous carrier in step (2) has a mesh size of 250-350 mesh, a specific surface area of 100-200 m 2 / g, a magnetic substance content of 75-90%, and a water content controlled at 0.5-5%.

4. The magnetic porous carrier induced nucleation coupling cyclonic separation enhanced granular sludge technology for upgrading and synergizing sewage application according to claim 1, characterized in that, In step (2), the sludge mixture prepared by mixing the magnetic porous carrier with the sludge is stirred by a stirring barrel, and the concentration is 1-5%; preferably, after the preparation of the sludge mixture in step (2), the sludge mixture is pumped into the front end of the influent of the aerobic tank of the biochemical treatment unit by a submerged sludge pump.

5. The magnetic porous carrier induced nucleation coupling cyclonic separation enhanced granular sludge technology for upgrading and synergizing sewage application according to claim 1, characterized in that, In step (3), the initial dosage of the magnetic porous carrier in the aerobic tank is 0.5-0.7 g / L, the dissolved oxygen in the aerobic tank is controlled at 2-4 mg / L, and the sludge concentration in the aerobic tank is 5500-8000 mg / L.

6. The magnetic porous carrier induced nucleation coupling cyclonic separation enhanced granular sludge technology for upgrading and synergizing sewage application according to claim 1, characterized in that, In step (4), the sludge mixture discharged from the aerobic tank of the biochemical treatment unit is subjected to gravity sedimentation in the secondary sedimentation tank.

7. The magnetic porous carrier induced nucleation coupling cyclonic separation enhanced granular sludge technology for upgrading and synergizing sewage application according to claim 1, characterized in that, In step (4), part of the composite of sludge and magnetic porous carrier is backflowed to the front end of the influent of the aerobic tank by a sludge backflow pump, and the backflow ratio is 50-150%.

8. The magnetic porous carrier induced nucleation coupling cyclonic separation enhanced granular sludge technology for upgrading and synergizing sewage application according to claim 1, characterized in that, The magnetic separation device in step (4) is composed of a dosing barrel, a stirrer, a submerged sludge pump and a cyclone separation device.

9. The magnetic porous carrier induced nucleation coupling cyclonic separation enhanced granular sludge technology for upgrading and synergizing sewage application according to claim 1, characterized in that, In step (5), the feed pressure of the cyclone separation device is 0.2-0.3 MPa.

10. The magnetic porous carrier induced nucleation coupling cyclonic separation enhanced granular sludge technology for upgrading and synergizing sewage application according to claim 1, characterized in that, In step (5), the ratio of the underflow and overflow flow rate of the cyclone separation device is 1:3-5.

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