Intensive magnetic medium sewage treatment system and process

Abstract

The application discloses an intensive magnetic medium sewage treatment system and process, and belongs to the technical field of sewage treatment. The system comprises an MBBR tank, a sludge collecting tank, a coagulation device and an ultra-magnetic separation device which are sequentially arranged along a sewage treatment path. Biological filler is arranged in the MBBR tank. The system further comprises a magnetic recovery device which is connected with the MBBR tank, the coagulation device and the ultra-magnetic separation device. The magnetic recovery device disperses and adsorbs the magnetic floc discharged from the ultra-magnetic separation device to obtain magnetic powder and micro-magnetic sludge. The magnetic powder is recycled in the coagulation device, part of the micro-magnetic sludge is discharged, and the other part of the micro-magnetic sludge is returned to the MBBR tank. The process is realized through the system. The system returns the micro-magnetic sludge to improve the microorganism concentration of the MBBR tank, improves the treatment load, increases the density of sludge and biological membrane of the system, improves the sludge settling capacity, and makes the effluent floc quickly settle and remove.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, in particular to an intensive magnetic medium sewage treatment system and process. BACKGROUND

[0002] Source interception is the most direct and effective measure for black and odorous river treatment, and is also the premise and basis for taking other technical measures. For the treatment of intercepted sewage, it is difficult to remove insoluble ammonia nitrogen and COD (chemical oxygen demand) in depth by using physical methods alone, and it is impossible to meet the self-purification capacity requirements of the receiving water body. Rainwater and sewage mixed sewage, overflow sewage polluted by organic matter, natural water body and the like in the intercepted sewage all belong to micro-polluted water bodies. Since the concentration of pollutants is low, the conventional mud film symbiotic process is usually used, but it is difficult for free activated sludge to grow and enrich. At the same time, the intercepted sewage needs to be treated in depth to meet the high discharge standard, and the total phosphorus and SS (suspended solids) in the effluent from the secondary sedimentation tank need to be treated in depth. Temporary facilities are generally required for micro-polluted water bodies, and the treatment water quantity is large. According to the conventional mud-water separation and depth treatment process, the system occupies a large area, and the investment and operation cost is high.

[0003] The MBBR pure membrane process is a mobile biological membrane filler sewage treatment technology. Based on the natural screening of microorganisms, a mud film composite process with more membranes and less mud is formed, which can realize the simultaneous removal of low-concentration ammonia nitrogen and total nitrogen when total nitrogen needs to be removed. The super magnetic separation is an ultra-high-speed water body purification technology based on magnetic flocculation and magnetic separation technology. The pollutants need only about 4-6 minutes from reaction to separation, which is only 1 / 10-1 / 20 of the hydraulic retention time of sand high-speed sedimentation and high-density sedimentation, and is an advanced large water quantity and high efficiency physical and chemical method water treatment equipment.

[0004] Patent CN201921719438.X provides a compact MBBR and super-efficiency separation coupled deep denitrification and phosphorus removal treatment system, which includes an anoxic pure membrane MBBR tank, an aerobic pure membrane MBBR tank, a magnetic seed loading tank, a flocculation tank and a sedimentation tank. The patent adopts a pure membrane + magnetic sedimentation system, but occupies a large area. Because there is no sludge return, it is difficult to maintain a certain concentration of microorganisms, the sludge age is small, and the denitrification capacity is affected, so it can only be used for stable low-concentration sewage. When the concentration of pollutants in the influent increases slightly, the effluent floc will inevitably increase, the effluent will exceed the standard, and the application range is narrow.

[0005] Patents CN 216946646 U and CN 215403359 U, although they mention the concept of membrane method simultaneous nitrification and denitrification, do not solve the problem of how to realize simultaneous nitrification and denitrification.

[0006] Patent CN 110803766 B "A kind of nitrification function type and reverse denitrification function type suspended carrier combined synchronous nitrification and denitrification process" is optimized for two kinds of fillers for synchronous nitrification and denitrification, but the carrier form and optimization mode are different.

[0007] Therefore, there is an urgent need for an emergency interception sewage treatment with small footprint and denitrification function, which can truly realize the function of synchronous nitrification and denitrification, and integrate the function of sewage advanced treatment. SUMMARY

[0008] In view of the deficiencies of the prior art, the present application provides an intensive magnetic medium sewage treatment system and process, which can remove pollutants such as COD, ammonia nitrogen, total nitrogen, total phosphorus and SS in sewage. The MBBR tank and sludge collection tank of the system replace the anaerobic, anoxic and aerobic tanks of the traditional A2O process, and the super-magnetic separation device replaces the secondary sedimentation tank and the advanced phosphorus removal system. The system is designed intensively, with small footprint. By recycling the micro-magnetic sludge, the microbial concentration in the MBBR tank is improved, the treatment load is increased, the density of the system sludge and biofilm is increased, and the sludge settling capacity is improved, so that the effluent flocs can be quickly settled and removed.

[0009] The technical scheme adopted by the present application is:

[0010] An intensive magnetic medium sewage treatment system, comprising an MBBR tank, a sludge collection tank, a coagulation device and a super-magnetic separation device arranged in sequence along a sewage treatment path; the MBBR tank is provided with biological fillers;

[0011] The system further comprises a magnetic recovery device connected to the MBBR tank, coagulation device and super-magnetic separation device;

[0012] The super-magnetic separation device discharges magnetic flocs into the magnetic recovery device, which are separated by dispersion to obtain magnetic powder and micro-magnetic sludge. The magnetic powder is recycled to the coagulation device, and part of the micro-magnetic sludge is discharged, and the other part of the micro-magnetic sludge is recycled to the MBBR tank.

[0013] In the intensive magnetic medium sewage treatment system disclosed in the present application, the sludge collection tank is also connected to the magnetic recovery device; the micro-magnetic sludge is recycled to the MBBR tank, collected in the sludge collection tank, and finally discharged into the magnetic recovery device for recovery.

[0014] In the intensive magnetic medium sewage treatment system disclosed in the present application, the MBBR tank has:

[0015] An aeration assembly is located at the bottom of the MBBR tank;

[0016] A fan is connected to the aeration assembly;

[0017] a DO detector and an ORP detector are arranged in the MBBR tank;

[0018] The fan can control the aeration frequency of the aeration assembly according to the monitoring data of the DO detector and the ORP detector, so as to adjust the dissolved oxygen or the oxidation-reduction potential in the MBBR tank.

[0019] In the intensive magnetic medium sewage treatment system disclosed in the application, the MBBR tank is further provided with a stirring device.

[0020] In the intensive magnetic medium sewage treatment system disclosed in the application, the MBBR tank is further provided with a controller connected with the fan, the stirring device, the DO detector and the ORP detector.

[0021] Based on the same inventive concept, the application further provides a process for sewage treatment by the above sewage treatment system, in particular, an intensive magnetic medium sewage treatment process, comprising the following steps:

[0022] Step S1. Biological filler is put into the MBBR tank to form a biofilm process by controlling the free sludge concentration, and the dissolved oxygen and the oxidation-reduction potential in the MBBR tank are adjusted by controlling the aeration frequency;

[0023] Step S2. After the sewage is pretreated, it enters the MBBR tank for biochemical reaction to remove pollutants, and then enters the sludge collection tank, where the free sludge and the shedded biofilm are quickly settled and removed, and the settled sludge is periodically discharged, and the supernatant enters the coagulation device;

[0024] Step S3. The supernatant in the coagulation device reacts with the gradually added magnetic powder, PAC and PAM to form magnetic flocs; the magnetic flocs are salvaged by the magnetic disk in the super-magnetic separation device and separated from the water body, and the clear water is discharged up to the standard, and the magnetic flocs enter the magnetic recovery device;

[0025] Step S4. The magnetic flocs in the magnetic recovery device are dispersed and separated to obtain magnetic powder and micro-magnetic sludge; the magnetic powder is returned to the coagulation device for recycling, a part of the micro-magnetic sludge is discharged, and the other part of the micro-magnetic sludge is returned to the MBBR tank as sludge supplement, and under the action of the micro-magnetic field, the metabolism and growth and attachment of microorganisms in the MBBR tank are promoted.

[0026] In the intensive magnetic medium sewage treatment process disclosed in the application, the amount of biological filler put in step S1 is 10-50%.

[0027] In the intensive magnetic medium sewage treatment process disclosed in the application, when only COD, ammonia nitrogen, total phosphorus and SS in the sewage need to be treated in the step S1, the dissolved oxygen concentration in the MBBR tank is controlled at 3-5 mg / L through continuous aeration.

[0028] In the intensive magnetic medium sewage treatment process disclosed in the application, when total nitrogen in the sewage needs to be removed in the step S1, the MBBR tank is stirred to realize uniform fluidization of the fillers in the tank; and through intermittent aeration, the oxidation-reduction potential is controlled at-100-100 mV to realize the simultaneous nitrification and denitrification mode.

[0029] In the intensive magnetic medium sewage treatment process disclosed in the application, in the step S4, the micro-magnetic sludge is returned to the MBBR tank and finally collected in the sludge collecting tank and then reenters the magnetic recovery device for magnetic recovery after enrichment.

[0030] Compared with the prior art, the application has the following beneficial effects:

[0031] (1) The intensive design has a small land occupation area; the system comprises a pure membrane MBBR biochemical system and a super-magnetic separation system, can realize removal of pollutants such as COD, ammonia nitrogen, total nitrogen, total phosphorus and SS in the sewage, and the MBBR tank and the sludge collecting tank of the system replace the anaerobic tank, the anoxic tank and the aerobic tank of the traditional A2O, and the super-magnetic separation device replaces the secondary sedimentation tank and the depth phosphorus removal system, so that the overall land occupation is reduced by 50%-70%.

[0032] (2) The micro-magnetic sludge is returned to the MBBR tank to improve the treatment capacity of the system; through the micro-magnetic sludge return, the microorganism concentration of the MBBR tank is improved to realize the improvement of the treatment load; the density of the sludge and the biofilm is increased to improve the sludge settling capacity, so that the effluent floc can be quickly settled and removed; and a large number of microorganisms with electricity in the sewage can utilize the magnetic effect to induce the enzyme activity and enzyme synthesis of the microorganisms under the action of the micro-magnetic field of the micro-magnetic sludge, promote the metabolism and growth and adhesion of the microorganisms, and improve the biofilm formation speed of the microorganisms. Meanwhile, the micro-magnetic effect can also promote the dissolution of oxygen in water and improve the reproduction and metabolism of the microorganisms.

[0033] (3) The MBBR tank can realize the simultaneous nitrification and denitrification in the same tank body; the blower of the MBBR tank controls the aeration frequency of the aeration assembly through the real-time data of the online DO detector and the ORP detector, and then controls the dissolved oxygen and the oxidation-reduction potential in a certain range, so that the simultaneous nitrification and denitrification mode operation can be realized through automatic adjustment of the operation parameters, and the simultaneous removal of total nitrogen is realized. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0035] Figure 1 It is a structural diagram of an intensive magnetic medium sewage treatment system;

[0036] Figure 2 This is a schematic diagram of the process of intensive magnetic medium wastewater treatment;

[0037] Figure 3 Schematic diagram of the structure of MBBR pool.

[0038] Reference numerals:

[0039] 1. MBBR pool; 11. Biological filler; 12. Aeration assembly; 13. Fan; 14. DO detector; 15. ORP detector; 16. Stirring device;

[0040] 2. Mud collection pool;

[0041] 3. Coagulation device;

[0042] 4. Super magnetic separation device;

[0043] 5. Magnetic recovery device. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It will be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some, rather than all, structures related to the present application are shown in the accompanying drawings. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0045] As used herein, the terms "comprise," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are intended only to describe specific embodiments and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0047] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0048] See also Figure 1 、 3 As shown, the embodiment of the present application provides an intensive magnetic medium sewage treatment system, the main purpose of which is to solve the problems that the treatment of existing slightly polluted water bodies generally requires the establishment of temporary facilities, and the water treatment volume is large. According to conventional mud-water separation and deep treatment processes, the system occupies a large area and has high investment and operating costs.

[0049] The present application discloses an intensive magnetic medium sewage treatment system, comprising an MBBR tank 1, a sludge collecting tank 2, a coagulation device 3, and a super magnetic separation device 4, which are sequentially arranged along a sewage treatment path. A biological filler 11 is arranged in the MBBR tank 1.

[0050] The system further comprises a magnetic recovery device 5, which is connected to the MBBR tank 1, the coagulation device 3 and the super magnetic separation device 4 respectively.

[0051] Among them, the magnetic flocs discharged from the super magnetic separation device 4 enter the magnetic recovery device 5, and after being broken up and separated, magnetic powder and micro magnetic sludge are obtained. The magnetic powder returns to the coagulation device 3 for recycling, part of the micro magnetic sludge is discharged, and the other part of the micro magnetic sludge is returned to the MBBR tank 1.

[0052] The system of the present application is of intensive design and occupies a small area. The system includes a pure membrane MBBR biochemical system and a supermagnetic separation system, which can remove pollutants such as COD, ammonia nitrogen, total nitrogen, total phosphorus, SS, etc. in sewage. The MBBR tank 1 and sludge collection tank 2 of the system replace the anaerobic, anoxic and aerobic tanks of traditional A2O, and the supermagnetic separation device 4 replaces the secondary sedimentation tank and deep phosphorus removal system, reducing the overall area by 50%-70%.

[0053] The MBBR tank 1 of this application utilizes biological filler 11, which achieves pure membrane MBBR technology by controlling the system food-microorganism ratio and filler ratio. The biological filler 11 can be a magnetic medium biological filler, which has been magnetically modified and optimized to improve biofilm formation performance, optimize community structure, and enhance biological removal capabilities.

[0054] Since MBBR tank 1 is mainly used for slightly polluted water bodies, the sludge grows slowly. In addition, due to endogenous respiration, the amount of sludge (biofilm) is difficult to maintain, which affects the treatment capacity. This application increases the concentration of microorganisms in MBBR tank 1 by recirculating micro-magnetic sludge, thereby increasing the treatment load.

[0055] Since the biofilm continuously shed in MBBR tank 1 has a low density and light texture, it easily flows out with the water, increasing the effluent SS or increasing the back-end removal pressure. This application increases the density of the system sludge and biofilm through micro-magnetic sludge return, improves the sludge settling capacity, and enables the effluent flocs to be quickly settled and removed.

[0056] Since sewage contains a large number of electrically charged microorganisms, the micromagnetic field of the return micromagnetic sludge can be used to induce enzyme activity and synthesis in the microorganisms, promoting their metabolism and growth, and increasing the rate of microbial biofilm formation. At the same time, the micromagnetic effect can promote the dissolution of oxygen in the water and enhance microbial reproduction and metabolism.

[0057] In one embodiment, the sludge collecting tank 2 is also connected to the magnetic recovery device 5. After the micro-magnetic sludge returns to the MBBR tank 1, it is collected in the sludge collecting tank 2 and finally recovered by the magnetic recovery device 5, which further reduces the magnetic powder loss rate and reduces the operating cost of the magnetic separation system.

[0058] In one embodiment, see Figure 3 As shown, the MBBR tank 1 has an aeration assembly 12, a blower 13, a DO (dissolved oxygen) meter 14, and an ORP (oxidation-reduction potential) meter. The aeration assembly 12 is located at the bottom of the MBBR tank 1, and the blower 13 is connected to the aeration assembly 12. The DO meter 14 and ORP meter 15 are installed within the MBBR tank 1 to measure the dissolved oxygen and oxidation-reduction potential within the tank, respectively.

[0059] The fan 13 can control the aeration frequency of the aeration assembly 12 and adjust the dissolved oxygen or redox potential in the MBBR tank 1 according to the monitoring data of the DO detector 14 and the ORP detector 15 .

[0060] In one embodiment, a stirring device 16 is further provided in the MBBR tank 1. The operation of the stirring device 16 enables uniform fluidization of the filler in the MBBR tank 1.

[0061] In one embodiment, the MBBR tank 1 is further provided with a controller. The PLC controller is connected to the DO detector 14 and the ORP detector 15, the fan 13, and the stirring device 16. The DO detector 14 and the ORP detector 15 transmit real-time monitoring data to the controller. The controller automatically adjusts the operating parameters of the fan 13 and the stirring device 16 based on the data, thereby achieving simultaneous nitrification and denitrification mode operation and simultaneous removal of total nitrogen.

[0062] Specifically, when only COD, ammonia nitrogen, total phosphorus and SS in the sewage need to be treated, the DO detector 14 and the ORP detector 15 respectively detect the dissolved oxygen and redox potential in the pool, and transmit the data to the controller. The controller adjusts the operating parameters of the fan 13 and the stirring device 16 according to the data, controls the aeration component 12 for continuous aeration, controls the dissolved oxygen within a certain range, and performs nitrification and decarbonization reaction.

[0063] Specifically, when it is necessary to remove total nitrogen from sewage, the DO detector 14 and the ORP detector 15 respectively detect the dissolved oxygen and redox potential in the pool, and transmit the data to the controller. The controller adjusts the operating parameters of the fan 13 and the stirring device 16 according to the data, controls the intermittent aeration of the aeration component 12, controls the redox potential and dissolved oxygen within a certain range, and realizes the synchronous nitrification and denitrification mode.

[0064] The MBBR pool 1 of the present application can realize simultaneous nitrification and denitrification in the same pool body; the fan 13 of the MBBR pool 1 controls the aeration frequency of the aeration component 12 through the real-time data of the online DO detector 14 and the ORP detector 15, thereby controlling the dissolved oxygen and the redox potential within a certain range. The simultaneous nitrification and denitrification mode can be realized by automatically adjusting the operating parameters to achieve the simultaneous removal of total nitrogen.

[0065] The above-mentioned embodiments have introduced the structure of the intensive magnetic medium sewage treatment system in detail. The following embodiments will attempt to briefly introduce the process of sewage treatment through this system, namely the intensive magnetic medium sewage treatment process.

[0066] See Figure 2 As shown, the present application discloses an intensive magnetic medium wastewater treatment process, comprising the following steps:

[0067] Step S1. Adding biological fillers into the MBBR tank and forming a biofilm process by controlling the free sludge concentration; regulating the dissolved oxygen and redox potential in the MBBR tank by controlling the aeration frequency;

[0068] Step S2. After conventional pretreatment, the wastewater enters the MBBR tank for biochemical reactions to remove pollutants. It then enters the sludge collection tank, where free sludge and detached biofilm are rapidly settled and removed. The settled sludge is regularly removed, and the supernatant enters the coagulation unit.

[0069] Step S3. The supernatant reacts with the gradually added magnetic powder, PAC, and PAM in a coagulation unit to form magnetic flocs. The magnetic flocs are then recovered by magnetic disks in a supermagnetic separation unit and separated from the water. The clean water meets discharge standards and enters a magnetic recovery unit.

[0070] Step S4. The magnetic flocs are broken up and separated in the magnetic recovery unit, producing magnetic powder and micro-magnetic sludge. The magnetic powder is returned to the coagulation unit for recycling, with some micro-magnetic sludge discharged and some returned to the MBBR tank as sludge supplement. The micro-magnetic field promotes the metabolism, growth, and attachment of microorganisms within the MBBR tank.

[0071] In one embodiment, in step S1, the amount of biological filler added is 10-50%. Specifically, the amount of biological filler added can be 10%, 20%, 30%, 40%, 50%, etc., depending on the actual water quality requirements.

[0072] In one embodiment, in step S1, when only COD, ammonia nitrogen, total phosphorus, and SS in the wastewater need to be treated, the dissolved oxygen concentration in the MBBR tank is controlled at 3-5 mg / L through continuous aeration. In other words, for scenarios where only COD, ammonia nitrogen, total phosphorus, and SS need to be controlled, the system can be operated directly in non-denitrification mode.

[0073] In another embodiment, in step S1, when total nitrogen removal from wastewater is required, the MBBR tank is stirred to achieve uniform fluidization of the filler within the tank. Intermittent aeration is used to control the redox potential between -100 and 100 mV, achieving a simultaneous nitrification and denitrification mode. Specifically, when total nitrogen removal is required, the MBBR tank can achieve simultaneous nitrification and denitrification within the same tank, achieving simultaneous removal of total nitrogen.

[0074] In one embodiment, in step S4, the micro-magnetic sludge is returned to the MBBR tank and finally collected in the sludge collecting tank. After being enriched to a certain degree, it re-enters the magnetic recovery device for magnetic recovery, which can further reduce the magnetic powder loss rate and reduce the operating cost of the magnetic separation system.

[0075] The intensive magnetic medium sewage treatment process of the present application returns the micro-magnetic sludge to the MBBR pool, thereby increasing the microbial concentration of the MBBR pool, achieving an increase in the treatment load, increasing the density of the system sludge and biofilm, improving the sludge settling capacity, and enabling the effluent flocs to be quickly settled and removed. Wastewater contains a large number of electrically charged microorganisms. Under the action of the micromagnetic field in the returning micro-magnetic sludge, the magnetic effect can be used to induce the enzyme activity and enzyme synthesis of the microorganisms, affect the metabolism and growth attachment of the microorganisms, and increase the biofilm formation rate of the microorganisms. At the same time, the micro-magnetic effect can promote the dissolution of oxygen in the water and improve the reproduction and metabolism of microorganisms. This process controls the aeration frequency of the MBBR pool, thereby controlling the dissolved oxygen and redox potential within a certain range, thereby achieving simultaneous nitrification and denitrification in the same pool body and achieving simultaneous removal of total nitrogen.

[0076] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An intensive magnetic medium sewage treatment system, characterized in that: It includes an MBBR tank, a sludge collecting tank, a coagulation device, and a super magnetic separation device arranged in sequence along the sewage treatment path; the MBBR tank is provided with biological fillers; The system also includes a magnetic recovery device, which is connected to the MBBR tank, the coagulation device, and the super magnetic separation device respectively; After conventional pretreatment, the wastewater enters the MBBR tank for biochemical reactions to remove pollutants. It then enters the sludge collection tank, where free sludge and detached biofilm are rapidly settled and removed. The settled sludge is regularly removed, and the supernatant enters the coagulation device. In the coagulation device, the supernatant reacts with the gradually added magnetic powder, PAC, and PAM to form magnetic flocs. The magnetic flocs are salvaged by magnetic disks in the supermagnetic separation device and separated from the water body. The clean water meets the discharge standards, and the magnetic flocs enter the magnetic recovery device. The magnetic flocs discharged from the super magnetic separation device enter the magnetic recovery device, and after being broken up and separated, magnetic powder and micro-magnetic sludge are obtained. The magnetic powder returns to the coagulation device for recycling. A part of the micro-magnetic sludge is discharged, and the other part of the micro-magnetic sludge is returned to the MBBR tank as sludge supplement. Under the action of the micromagnetic field, the microorganisms in the MBBR tank are promoted to metabolize and grow and attach, thereby increasing the biofilm formation speed of the microorganisms. The sludge collecting tank is also connected to the magnetic recovery device; after the micro-magnetic sludge flows back to the MBBR tank, it is collected in the sludge collecting tank and finally discharged into the magnetic recovery device for recovery.

2. The intensive magnetic medium sewage treatment system according to claim 1, characterized in that: The MBBR pool has: an aeration assembly, located at the bottom of the MBBR tank; a fan connected to the aeration assembly; A DO detector and an ORP detector are arranged in the MBBR tank; The fan can control the aeration frequency of the aeration assembly and adjust the dissolved oxygen or redox potential in the MBBR tank according to the monitoring data of the DO detector and the ORP detector.

3. The intensive magnetic medium sewage treatment system according to claim 2, characterized in that: A stirring device is also provided in the MBBR tank.

4. The intensive magnetic medium sewage treatment system according to claim 3, characterized in that: The MBBR pool also has a controller, which is connected to the fan, stirring device, DO detector and ORP detector respectively.

5. An intensive magnetic medium wastewater treatment process, characterized in that: The intensive magnetic medium sewage treatment system according to any one of claims 1 to 4 comprises the following steps: Step S1. Adding biological fillers into the MBBR tank and forming a biofilm process by controlling the free sludge concentration; regulating the dissolved oxygen and redox potential in the MBBR tank by controlling the aeration frequency; Step S2. After conventional pretreatment, the wastewater enters the MBBR tank for biochemical reactions to remove pollutants. It then enters the sludge collection tank, where free sludge and detached biofilm are rapidly settled and removed. The settled sludge is regularly removed, and the supernatant enters the coagulation unit. Step S3. The supernatant reacts with the gradually added magnetic powder, PAC, and PAM in a coagulation unit to form magnetic flocs. The magnetic flocs are then recovered by magnetic disks in a supermagnetic separation unit and separated from the water. The clean water meets discharge standards and enters a magnetic recovery unit. Step S4. The magnetic flocs are broken up and separated in the magnetic recovery unit, producing magnetic powder and micro-magnetic sludge. The magnetic powder is returned to the coagulation unit for recycling, with some micro-magnetic sludge discharged and some returned to the MBBR tank as sludge supplement. The micro-magnetic field promotes the metabolism, growth, and attachment of microorganisms within the MBBR tank.

6. The intensive magnetic medium wastewater treatment process according to claim 5, characterized in that: In step S1, the amount of biological filler added is 10-50%.

7. The intensive magnetic medium wastewater treatment process according to claim 5, characterized in that: In step S1, when only COD, ammonia nitrogen, total phosphorus and SS in the sewage need to be treated, the dissolved oxygen concentration in the MBBR tank is controlled at 3-5 mg / L through continuous aeration.

8. The intensive magnetic medium wastewater treatment process according to claim 5, characterized in that: In step S1, when total nitrogen in sewage needs to be removed, the MBBR pool is stirred to achieve uniform fluidization of the filler in the pool; and through intermittent aeration, the redox potential is controlled at -100~100mV to achieve a simultaneous nitrification and denitrification mode.

9. The intensive magnetic medium wastewater treatment process according to claim 5, characterized in that: In step S4, the micro-magnetic sludge is returned to the MBBR tank and finally collected in the sludge collecting tank. After enrichment, it re-enters the magnetic recovery device for magnetic recovery.

Images