Magneto-biochemical integrated intensive efficient treatment system and treatment process thereof

Abstract

The invention discloses a magnetic biochemical integrated intensive efficient treatment system and a treatment process thereof, and relates to the technical field of sewage treatment. The treatment system comprises an intelligent magnetic powder feeding system, a magnetic biochemical system, a magnetic precipitation system, a sludge hydrolytic acidification system and a magnetic powder recovery system, wherein the magnetic biochemical system comprises a magnetic anaerobic tank, a magnetic anoxic tank and a magnetic aerobic tank; the magnetic precipitation system comprises an activated carbon tank, a magnetic coagulation tank, a magnetic flocculation tank and a magnetic precipitation tank; to-be-treated sewage is subjected to nitrogen and phosphorus removal through the magnetic biochemical system, then enters the magnetic coagulation tank and the magnetic flocculation tank to react with PAC and PAM and finally enters the magnetic sedimentation tank, magnetic powder and activated sludge of one part of settled sludge flow back into the magnetic anaerobic tank, the magnetic powder and residual sludge of the other part of settled sludge are separated, the separated magnetic powder enters the magnetic anaerobic tank to participate in the reaction, and the magnetic powder enters the magnetic flocculation tank to react with the magnetic flocculation tank. And residual sludge enters a sludge hydrolysis acidification system. The system has the technical advantages of being convenient to operate and manage, reducing the occupied area and saving the energy consumption and the chemical consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a magnetic biochemical integrated intensive and efficient treatment system and a treatment process thereof. Background Art

[0002] The magnetic biochemical activated sludge technology is to add magnetic powder (Fe3O4) to the activated sludge. After the sludge flocs are combined with the magnetic powder, a compact magnetic biochemical activated sludge is formed, which can improve the processing capacity and stability of the biochemical system, accelerate the growth rate of biomass, and greatly improve the sludge concentration and sludge sedimentation. The magnetic coagulation sedimentation technology is to add magnetic powder with a specific gravity of about 4 to the traditional coagulation sedimentation process to form super-heavy magnetic coagulation flocs with magnetic powder as the crystal nucleus, and the mud-water separation speed is extremely fast. The super-heavy magnetic coagulation flocs combined with magnetic powder are deflocculated under the rapid stirring and shearing action of the high shear machine of the magnetic mud disperser, and then enter the magnetic powder recovery device with permanent magnets. The magnetic powder is recovered by the magnetic powder recovery device and returned to the magnetic coagulation system for reuse, and the remaining sludge flows to the sludge storage tank by gravity.

[0003] The above two technologies essentially add magnetic powder into the system to combine the magnetic powder and sludge. It is the future development trend of this technology to fully combine the advantages of the two technologies to form an integrated and systematic process.

[0004] Related research on the combination of magnetic powder and sludge in the prior art includes:

[0005] CN116395845 A discloses a magnetized activated sludge treatment system and its treatment process, including a biochemical subsystem, a magnetic recovery subsystem, and a dosing subsystem. The technical solution introduces the magnetic biochemical activated sludge process in detail, but does not combine the magnetic coagulation process. CN102992476 A discloses a magnetic loading magnetic mud internal return sewage biological treatment process and device system, which forms magnetic loading activated sludge by adding magnetic powder into the activated sludge aeration tank and taming it. The magnetic powder and sludge are separated by an electromagnetic separation device at the liquid surface of the aeration tank. The system eliminates the secondary sedimentation tank and sludge return of the traditional activated sludge, but does not set up deep treatment, and the magnetic field strength of the electromagnetic separation device is also affected by factors such as current, and the energy consumption is relatively large. CN116332425 A discloses a wastewater treatment method based on a magnetic loading activated sludge process, in which magnetic powder is added to an anaerobic tank, an anoxic tank and an aerobic tank simultaneously, and stirring is set in the anaerobic and anoxic tanks, and aeration is set in the aerobic tank, but the aeration disturbance mode of the aerobic tank is not mentioned, and a deep treatment system is not designed. CN 116216979 A discloses an intensive magnetic powder sewage treatment system and process, in which an MBBR tank is connected to a sludge collection tank, and then a magnetic coagulation is connected, and a magnetic separation device is used to separate the magnetic sludge in the magnetic coagulation and the sludge collection tank, and the magnetic powder is returned to the magnetic coagulation, and a part of the micro-magnetic sludge after magnetic separation is discharged, and the other part is returned to the MBBR tank. This process requires a sedimentation tank to be connected to the MBBR tank, and a large amount of magnetic powder is circulated in the magnetic coagulation, and the magnetic powder participating in the large cycle of the biochemical system is relatively small, and the advantages of magnetic biochemistry are not fully utilized. CN 117185513 A discloses a method for treating eel breeding wastewater by magnetic coagulation coupled with biological enhancement, wherein the wastewater is treated by a magnetic anaerobic tank, a middle sedimentation tank, a nitrification tank, a magnetic anoxic tank, a magnetic coagulation tank, and a sedimentation tank process, wherein the nitrification tank uses a fixed biological filler, a coagulant, a flocculant, and magnetic powder are added to the magnetic coagulation tank, a part of the magnetic mud in the sedimentation tank is returned to the magnetic anaerobic tank, and the other part is recovered by a magnetic powder separator and the magnetic powder is put into the magnetic coagulation tank, and the sludge is dehydrated and transported out. The process combines magnetic coagulation and biochemical treatment, and although part of the magnetic mud is returned to the magnetic anaerobic tank, the magnetic mud enters the magnetic anoxic tank after settling from the middle sedimentation tank, and does not enter the nitrification tank. In essence, the magnetic mud only participates in part of the biochemical reaction, and the system is mostly provided with a middle sedimentation tank, and the particle size and content of the magnetic powder are not mentioned. CN 117430219 A discloses a magnetic coagulation sludge deep dehydration treatment device and method. The method is based on the magnetic coagulation technology, and a conical filter is added to the bottom of the magnetic sedimentation tank to pre-screen magnetic muds of different particle sizes, and the small-particle-size magnetic mud is returned to the magnetic coagulation inlet water. The large-particle-size magnetic mud is separated by a magnetic powder separator and then the magnetic powder is put into a magnetic powder mixing reaction tank. The method is an improvement of the magnetic coagulation technology, but is not combined with the magnetic biochemical technology.

[0006] It can be seen that in the process of water treatment using a combination of magnetic powder and sludge in the prior art, there are still technical problems such as high energy consumption, low sludge treatment efficiency, and substandard effluent. Summary of the invention

[0007] In order to solve the technical problems existing in the above-mentioned prior art, one of the purposes of the present invention is to propose an integrated magnetic biochemical intensive and efficient treatment system. In view of the low C / N ratio of sewage in my country, sludge hydrolysis technology is adopted to fully combine it with magnetic biochemical and magnetic coagulation technology to form an integrated intensive and efficient treatment system. The treatment system has the technical advantages of convenient operation and management, reduced floor space, and saved energy and drug consumption.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A magnetic biochemical integrated intensive and efficient treatment system, comprising a magnetic powder intelligent dosing system, a magnetic biochemical system, a magnetic precipitation system, a sludge hydrolysis acidification system and a magnetic powder recovery system, wherein the magnetic biochemical system comprises a magnetic anaerobic tank, a magnetic anoxic tank and a magnetic aerobic tank arranged in sequence according to the direction of water flow, and a nitrification liquid reflux pipeline is arranged between the magnetic aerobic tank and the magnetic anoxic tank;

[0010] The magnetic precipitation system comprises an activated carbon tank, a magnetic coagulation tank, a magnetic flocculation tank and a magnetic precipitation tank which are sequentially arranged after the magnetic aerobic tank;

[0011] The magnetic powder intelligent dosing system is used to add magnetic powder to the magnetic anaerobic tank in a timely and quantitative manner. The added magnetic powder enters the magnetic anaerobic tank and fully combines with the extracellular secretions of the activated sludge in the magnetic anaerobic tank to form magnetized activated sludge with the magnetic powder as the crystal nucleus.

[0012] The outlet pipeline at the bottom of the magnetic sedimentation tank is respectively connected with a first pipeline and a second pipeline. The first pipeline is a magnetic mud return pipeline, which is used to return the magnetic powder and activated sludge to the magnetic anaerobic tank; the second pipeline is provided with the magnetic powder recovery system, which is used to separate the magnetic powder and the residual sludge. The separated magnetic powder enters the magnetic anaerobic tank for continued use, and the separated residual sludge enters the sludge hydrolysis acidification system;

[0013] The sludge hydrolysis and acidification system comprises a sludge hydrolysis and acidification device, which is used to convert macromolecular organic matter in the residual sludge into small molecular organic matter, and the obtained supernatant is introduced into the magnetic anaerobic tank as a carbon source, and the obtained bottom sludge is discharged to a sludge dewatering workshop connected to the sludge hydrolysis and acidification device.

[0014] The above-mentioned integrated magnetic biochemical intensive and efficient treatment system, the magnetic powder adding system silo, stirring mechanism, weighing sensor and PLC control cabinet, the silo is located directly above the anaerobic tank, the stirring mechanism is used to stir the magnetic powder in the silo to prevent it from agglomerating, and the PLC control cabinet is used to control the amount of magnetic powder added to the anaerobic tank and the time of addition.

[0015] In the above-mentioned integrated magnetic biochemical intensive and efficient treatment system, the magnetic anaerobic tank, magnetic anoxic tank, activated carbon tank, magnetic coagulation tank and magnetic flocculation tank are all equipped with agitators, a ceiling is set above the magnetic anaerobic tank and a rail vehicle for hoisting magnetic powder is provided; a pulse aeration component is arranged in the magnetic aerobic tank, and the pulse aeration component includes a pulse perforated aerator and a tubular microporous aerator, and aeration is performed in a staggered arrangement of the pulse perforated aerator at the bottom and the tubular microporous aerator at the top.

[0016] In the above-mentioned integrated magnetic biochemical intensive and efficient treatment system, a heavy-duty scraper is arranged in the magnetic sedimentation tank, and a magnetic mud reflux pump and a magnetic powder recovery pump are respectively arranged on the first pipeline and the second pipeline.

[0017] The above-mentioned integrated magnetic biochemical intensive and efficient processing system, the magnetic powder recovery system includes a magnetic mud disperser and a magnetic powder separator, the impeller of the magnetic mud disperser is made of wear-resistant alloy material; the magnetic powder is Fe3O4 or Fe3O4 modified with diatomaceous earth, peanut shells or straw, and the particle size of the magnetic powder is 400-800 mesh.

[0018] The above-mentioned magnetic biochemical integrated intensive and efficient treatment system, the activated carbon adsorption tank is used to add activated carbon for emergency treatment when COD reaches the limit value, the magnetized activated sludge enters the activated carbon adsorption tank from the magnetic aerobic tank to react with the activated carbon, then enters the magnetic coagulation tank for coagulation and flocculation with PAC, then flows into the magnetic flocculation tank for flocculation with PAM, and then is separated from the mud and water in the magnetic sedimentation tank.

[0019] In the above-mentioned integrated magnetic biochemical intensive and efficient treatment system, the bottom corners of the magnetic anaerobic tank, the magnetic anoxic tank and the magnetic aerobic tank are chamfered.

[0020] Another object of the present invention is to provide a magnetic biochemical integrated intensive and efficient treatment process, which uses the above-mentioned magnetic biochemical integrated intensive and efficient treatment system, and the treatment process includes the following steps:

[0021] a. Start-up culture of activated sludge system;

[0022] Using COD in raw water or sodium acetate as carbon source, adding a certain amount of activated sludge for cultivation,

[0023] When the concentration of activated sludge rises to above 1500mg / L, 200-500mg / L of magnetic powder is gradually added through the magnetic powder intelligent dosing system for initial taming. The magnetic mud formed in this process is only refluxed through the magnetic mud reflux pump.

[0024] When the activated sludge concentration increases to above 5000mg / L, gradually add the magnetic powder content to 500-1000mg / L and ensure the stable operation of the system;

[0025] b. The sewage to be treated is passed into the magnetic anaerobic tank, and is evenly mixed with the magnetic mud and magnetic powder in the magnetic anaerobic tank under the action of stirring to form a magnetized activated sludge with the magnetic powder as the crystal nucleus; denitrification reaction occurs in the magnetic anoxic tank, and nitrification reaction occurs in the magnetic aerobic tank;

[0026] c. The sewage to be treated enters the activated carbon pool, and activated carbon is added according to whether the COD exceeds the standard;

[0027] d. The sewage to be treated enters the magnetic coagulation tank to react with PAC, and then enters the magnetic flocculation tank to react with PAM; then enters the magnetic sedimentation tank, and the supernatant water meets the discharge standards; part of the settled sludge is returned to the magnetic anaerobic tank through the first pipeline to transfer the magnetic powder and activated sludge, and part of it is transported to the magnetic powder recovery system through the second pipeline to separate the magnetic powder and the remaining sludge. The separated magnetic powder enters the magnetic anaerobic tank to participate in the reaction, and the separated remaining sludge enters the sludge hydrolysis acidification system;

[0028] e. The sludge hydrolysis and acidification system converts the macromolecular organic matter in the residual sludge into small molecular organic matter, and the obtained supernatant is introduced into the magnetic anaerobic tank as a carbon source, and the obtained bottom sludge is discharged to the sludge dewatering workshop connected to the sludge hydrolysis and acidification device.

[0029] In the above-mentioned integrated magnetic biochemical intensive and efficient treatment process, in step b, in the magnetic anoxic tank, the magnetized activated sludge is mixed with the nitrification liquid returned from the magnetic aerobic tank, and then a denitrification reaction is carried out using the carbon source in the sewage to be treated; in the magnetic aerobic tank, the magnetized activated sludge undergoes a nitrification reaction under the disturbance of aeration.

[0030] Compared with the prior art, the present invention brings the following beneficial technical effects:

[0031] (1) The present invention fully combines the advantages of magnetic biochemistry and magnetic coagulation. The magnetic precipitation system is connected to the magnetic aerobic tank of the magnetic biochemical system without a secondary sedimentation tank in between. After the magnetic mud reacts with PAC and PAM in the magnetic precipitation system, the solid-liquid separation is completed in the magnetic precipitation tank. The surface load of the integrated intensive and efficient treatment system of the present application can reach 6 to 8 m 3 / (m 2 ·h), which is higher than the 0.8~1.2m of conventional activated sludge sedimentation tank 3 / (m2 h) and 1~1.5m of magnetic biochemical secondary sedimentation tank 3 / (m 2 h), part of the magnetic sludge settled in the magnetic sedimentation tank is returned to the magnetic anaerobic tank, and the other part is recovered by the magnetic powder recovery device and then discharged to the sludge hydrolysis and acidification system. This arrangement can reduce the land area by more than 1 / 4, reduce construction investment, simplify the operation and maintenance work of operators, and reduce operating costs.

[0032] (2) The present invention adds magnetic powder into the magnetic anaerobic tank, and the magnetic powder combines with the activated sludge to form magnetized activated sludge, which can make the sludge floc structure more compact, avoid the occurrence of sludge expansion, and accelerate the sludge settling speed; after adding the magnetic powder, the concentration of the activated sludge will also increase from the conventional 3-4g / L to 8-12g / L, thereby improving the sludge treatment capacity and reducing the footprint of the magnetic biochemical system.

[0033] (3) The present invention performs chamfering on the bottom corners of the magnetic anaerobic tank, the magnetic anoxic tank and the magnetic aerobic tank, and selects pulse aeration components to reduce the distance between each group of aerators and the distance between the aerator and the bottom of the tank. The pulse perforated aerators are arranged below the microporous aerators and staggered. At the same time, a control program is set for the aeration components to start each group of pulse perforated aeration at a fixed time to pulse purge the bottom of the tank, thereby effectively preventing the magnetic mud from being deposited in large quantities at the bottom corners of the tank bottom and at the bottom of the aerator.

[0034] (4) The sludge discharged from the magnetic sedimentation tank is first recovered by the magnetic powder recovery system, and then the sludge enters the sludge hydrolysis and acidification system, and finally discharged to the sludge dewatering workshop. The supernatant produced by the sludge hydrolysis and fermentation can be used as a supplementary carbon source to improve the C / N ratio in the sewage. After the sewage is efficiently treated by the magnetic biochemical system and the magnetic precipitation system, all indicators of sewage indicators TP, TN, COD, NH3-N, and SS can be achieved, and the effluent can stably meet the quasi-Class III emission standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below in conjunction with the accompanying drawings:

[0036] Figure 1 It is a schematic diagram of the structure of the processing system of the present invention;

[0037] Figure 2 This is a process flow chart of the present invention;

[0038] In the figure:

[0039] 1. Magnetic anaerobic tank, 2. Magnetic anoxic tank, 3. Magnetic aerobic tank, 4. Activated carbon tank, 5. Magnetic coagulation tank, 6. Magnetic flocculation tank, 7. Magnetic sedimentation tank, 8. Magnetic mud disperser, 9. Magnetic powder separator, 10. Magnetic powder intelligent dosing system, 11. Agitator, 12. Tubular microporous aerator, 13. Pulse perforated aerator, 14. Heavy-duty scraper, 15. Magnetic powder recovery pump, 16. Magnetic mud reflux pump, 17. Rail vehicle, 18. Sludge hydrolysis and acidification device, 19. Liftable submersible sewage pump, 20. Electric hoist. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0041] It is understandable that the connection relationship described in this application refers to direct or indirect connection. For example, the connection between A and B can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components. For example, A and C can be directly connected, and C and B can be directly connected, so that A and B are connected through C. It is also understandable that the "A connects B" described in this application can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0042] In the description of this application, unless otherwise specified, " / " means "or", for example, A / B can mean A or B. "And / or" in this article is only a way to describe the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0043] In the description of this application, words such as "first" and "second" are only used to distinguish different objects, and do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit differences. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0044] The technical solution of the present application is further described in detail below in conjunction with the accompanying drawings.

[0045] like Figure 1 As shown, the present invention is an integrated magnetic biochemical intensive and efficient treatment system, including a magnetic powder intelligent dosing system 10, a magnetic biochemical system, a magnetic precipitation system, a sludge hydrolysis and acidification system and a magnetic powder recovery system.

[0046] The above-mentioned magnetic powder intelligent dosing system 10 includes a silo, a screw conveying motor, a vibration motor, a stirring mechanism, a weighing sensor and a PLC control cabinet. The silo is located directly above the magnetic anaerobic tank. The stirring mechanism is used to stir the magnetic powder in the silo to prevent it from agglomerating. The PLC control cabinet is used to control the amount of magnetic powder put into the magnetic anaerobic tank and the time of putting it in. The PLC control cabinet is used to control the timing and quantitative addition of magnetic powder, and the stirring mechanism is used to fully stir the bottom of the silo to prevent the magnetic powder from agglomerating and arching at the bottom of the silo. The magnetic powder intelligent dosing system is located directly above the magnetic anaerobic tank 1, which is convenient for adding magnetic powder therein.

[0047] Preferably, the main component of the magnetic powder is Fe3O4. The magnetic powder can also be modified, such as acid leaching, coating with diatomaceous earth, peanut shells, straw, etc. The particle size range of the magnetic powder is 600-800 mesh.

[0048] The magnetic powder recovery system is also located above the magnetic anaerobic tank 1, and mainly includes a magnetic mud disperser 8 and a magnetic powder separator 9. The impeller of the magnetic mud disperser 8 is made of wear-resistant alloy material. The magnetic mud mixture in the sedimentation tank is dispersed by the magnetic mud disperser 8, and then the sludge and magnetic powder are separated by the magnetic powder separator 9, and the separated magnetic powder is returned to the magnetic anaerobic tank 1.

[0049] Preferably, a roof is provided on the magnetic anaerobic tank 1 and a rail carriage 17 is provided, which may be a steel structure or a concrete structure, so as to facilitate the lifting of ton bags of magnetic powder and provide a small area of ​​rain shelter to avoid difficulty in uniform addition of the magnetic powder after being exposed to rain.

[0050] The magnetic biochemical system includes a magnetic anaerobic pool 1, a magnetic anoxic pool 2, and a magnetic aerobic pool 3 arranged in sequence according to the direction of water flow; a nitrification liquid reflux pipeline is arranged between the magnetic aerobic pool and the magnetic anoxic pool. The magnetic precipitation system includes an activated carbon pool 4, a magnetic coagulation pool 5, a magnetic flocculation pool 6, and a magnetic precipitation pool 7 arranged in sequence after the magnetic aerobic pool. A stirrer 11 is configured in the magnetic anaerobic pool, the magnetic anoxic pool, the activated carbon pool, the magnetic coagulation pool, and the magnetic flocculation pool. When selecting the stirrer 11 of the magnetic anaerobic pool 1 and the magnetic anoxic pool 2, a flow state simulation is performed according to the pool type and volume to make the muddy water flow more uniform, avoid the formation of turbulence, short flow and dead water area, and prevent the magnetic mud from depositing at the bottom corners of the pool. A pulse aeration component is arranged in the magnetic aerobic pool, and the pulse aeration component includes a pulse perforated aerator 13 and a tubular microporous aerator 12. Aeration is performed by staggered arrangement of the pulse perforated aerator at the bottom and the tubular microporous aerator at the top. At the same time, the distance between each group of aerators and the distance between the aerator and the bottom of the pool is reduced to reduce the magnetic mud deposition caused by insufficient aeration disturbance. After the magnetic powder is added to the magnetic anaerobic pool 1 by the magnetic powder intelligent dosing system 10, it is evenly mixed with the activated sludge under the stirring of the agitator 11, and the magnetic powder is further combined with the extracellular secretions of microorganisms in the activated sludge to form a magnetized activated sludge with magnetic powder as the crystal nucleus. Compared with traditional activated sludge, magnetized activated sludge has a larger specific gravity, which can significantly improve the floc structure and sedimentation performance of sludge and overcome sludge expansion; after adding an appropriate amount of magnetic powder, the activated sludge is significantly more efficient in removing COD and ammonia nitrogen than the unmagnetized activated sludge under the action of the biological magnetic effect. In addition, the concentration of magnetized activated sludge can be increased from 3 to 4 g / L of traditional activated sludge to 8 to 12 g / L, thereby improving the treatment capacity per unit volume, shortening the reaction time, reducing the land occupation of sewage structures, and saving investment.

[0051] The activated carbon pool 4 is used to add activated carbon for emergency treatment when COD reaches the limit value. A heavy-duty scraper 14 is provided in the magnetic sedimentation tank. The outlet pipeline at the bottom of the magnetic sedimentation tank is connected with a first pipeline and a second pipeline respectively. The first pipeline is a magnetic mud return pipeline, which is used to return magnetic powder and activated sludge to the magnetic anaerobic tank; the second pipeline is provided with the magnetic powder recovery system, which is used to separate magnetic powder and residual sludge. The separated magnetic powder enters the magnetic anaerobic tank for continued use, and the separated residual sludge enters the sludge hydrolysis acidification system. The first pipeline and the second pipeline are provided with a magnetic mud return pump 16 and a magnetic powder recovery pump 15 respectively; the magnetic powder recovery pump 15 transports part of the settled and compressed magnetic mud to the magnetic powder recovery device to separate the magnetic mud, and the separated magnetic powder returns to the magnetic anaerobic tank 1, and the residual sludge is transported to the sludge hydrolysis acidification device 18, and part of it is returned to the magnetic anaerobic tank 1 through the magnetic mud return pump 16.

[0052] The sludge hydrolysis and acidification device 18 includes a stirrer, a liftable submersible sewage pump 19, an electric hoist 20, and can be optionally equipped with a mud level meter and a liquid level meter. The sludge after the magnetic powder is recovered by the magnetic powder separator enters the sludge hydrolysis and acidification device 18. The sludge hydrolysis and acidification device is used to convert the macromolecular organic matter in the remaining sludge into small molecular organic matter. The obtained supernatant is passed into the magnetic anaerobic tank as a carbon source, and the obtained sludge is discharged to the sludge dewatering workshop connected to the sludge hydrolysis and acidification device.

[0053] The impeller of the magnetic mud disperser 8 is made of wear-resistant alloy, and the magnetic powder separator 9 uses rare earth permanent magnets to achieve high magnetic field strength and low field strength attenuation.

[0054] like Figure 2 As shown, the present invention provides an integrated magnetic biochemical intensive and efficient treatment process, comprising the following steps:

[0055] Step 1: Start the culture of activated sludge system;

[0056] This system needs to be domesticated before it is enabled. In the start-up and cultivation stage of the activated sludge system, COD in the raw water or sodium acetate is used as a carbon source, and a certain amount of activated sludge is added for cultivation. When the concentration of activated sludge rises to above 1500mg / L, 200-500mg / L of magnetic powder is gradually added through the magnetic powder intelligent dosing system for initial domestication. At this time, the magnetic mud only circulates in the magnetic biochemical system, and various water quality indicators and DO changes are monitored at the same time. After the system is stable, water is introduced at a small flow rate. During this process, no mud is discharged, and the magnetic mud is only refluxed. After the system is stable, as the sludge concentration increases to above 5000mg / L, the magnetic powder content is gradually supplemented to 500-1000mg / L depending on the sludge situation, and it can operate stably. Magnetic powder can also be directly added to the stable activated sludge to omit the sludge cultivation startup stage.

[0057] Step 2, when the system is running stably, the sewage to be treated is passed into the magnetic anaerobic tank, and the magnetic mud in the magnetic anaerobic tank, the magnetic powder recovered by the magnetic powder separator 9, and the magnetic powder added by the magnetic powder intelligent dosing system 10 are uniformly mixed under the action of the agitator 11, and gradually combined into magnetized activated sludge, and some organic pollutants in the water are converted and utilized in the anaerobic environment. After the magnetized activated sludge in the magnetic anoxic tank 2 is mixed with the nitrified liquid refluxed from the magnetic aerobic tank 3, the carbon source in the water is used to carry out denitrification reaction. In the magnetic aerobic tank 3, under the action of aeration and oxygenation disturbance, the magnetic mud undergoes nitrification reaction. At this time, due to the large specific gravity of the magnetic mud, the magnetic mud may disintegrate or the aeration disturbance is insufficient, which easily causes the magnetic powder or magnetic mud to be deposited at the bottom of the magnetic aerobic tank 3. At this time, the pulse disturbance of the pulse perforated aerator 13 can be used to make the magnetic mud at the bottom of the tank return to the system.

[0058] Step 3: After the muddy water enters the activated carbon pool 4, activated carbon can be added as needed to ensure that COD does not exceed the standard.

[0059] Step 4, the muddy water reacts with PAC in the magnetic coagulation tank 5, and then enters the magnetic flocculation tank 6 to react with PAM. Under the action of the electrical neutralization, adsorption bridging of PAC and the adsorption bridging of PAM, some soluble, colloidal and suspended pollutants in the muddy water are further combined with the magnetized sludge, and then enters the magnetic coagulation tank 7 for precipitation. The supernatant can be directly discharged to meet the standards. Part of the settled sludge is returned to the magnetic anaerobic tank 1 through the magnetic mud return pump 16 to continue the cycle reaction, and the other part is transported to the magnetic mud disperser 8 through the magnetic powder recovery pump 15. Under the action of the magnetic mud disperser 8, the magnetic mud is dispersed, and then enters the magnetic powder separator 9. The magnetic powder is recovered by the permanent magnet and then re-enters the magnetic anaerobic tank 1 to participate in the reaction cycle, and the remaining sludge is discharged to the sludge hydrolysis acidification device 18.

[0060] Step 5: After hydrolysis and acidification, the supernatant is transported to the magnetic anaerobic tank via the liftable submersible sewage pump 19 as a supplementary carbon source, and the sludge is transported to the sludge dewatering workshop via the liftable submersible sewage pump 19, and then transported out for treatment after dehydration.

[0061] The present invention will be further described below in conjunction with specific embodiments.

[0062] Embodiment 1:

[0063] A sewage treatment plant in Qingdao, Shandong, originally designed to be 80,000 m 3 / d, treating municipal sewage and some industrial sewage. As the original plant's treatment capacity cannot be further improved, 10,000m3 is urgently needed. 3 / d processing capacity expansion and increase in volume. Due to the limited land area of ​​the plant, conventional processes cannot meet the needs of project expansion. Therefore, the magnetic biochemical integrated intensive and efficient treatment system and process of the present invention is adopted, and the designed water treatment volume is 10,000 m 3 / d, the effluent is designed according to the Quasi-IV discharge standard. The inlet and outlet water quality is shown in Table 1.

[0064] Table 1

[0065] index COD(mg / L) Ammonia nitrogen (mg / L) TN(mg / L) TP(mg / L) SS(mg / L) Average water inlet 230 45 50 6 265 Average water output 23 0.3 8 0.2 6

[0066] As can be seen from Table 1, by using the integrated intensive and efficient treatment process of the present invention to treat the sewage, the effluent indicators can stably reach the quasi-IV effluent discharge standard, and the removal rates of COD, ammonia nitrogen, TN, TP, and SS are 90%, 99.3%, 84%, 96.7%, and 97.7%, respectively.

[0067] In summary, the magnetic biochemical integrated intensive and efficient treatment system and treatment process of the present invention fully combines the advantages of sludge hydrolysis and acidification, magnetic biochemistry and magnetic coagulation, and directly returns the magnetic sludge from the magnetic sedimentation tank to the magnetic anaerobic tank. The discharged sludge is recovered by the magnetic powder recovery device and then subjected to sludge hydrolysis and acidification. The bottom sludge is dehydrated and transported for treatment, and the supernatant is used as a supplementary carbon source. In addition, there is no need to set up a secondary sedimentation tank after magnetic biochemistry, and it is different from returning the remaining sludge after magnetic coagulation separation of magnetic powder to the biochemical tank. The present application overcomes the sludge swelling phenomenon, improves the sewage C / N ratio, improves the sludge concentration and system processing capacity, reduces drug consumption, saves more than a quarter of the land, and is simple to operate and manage. It can be applied to new projects and can also be used for the upgrading and transformation of the activated sludge process. Basically, no other structures need to be added, and the changes to civil engineering are also relatively small.

[0068] Parts not described in the present invention can be implemented by referring to the existing technology.

[0069] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present application and are not intended to be limiting of the present application. As long as they are within the spirit and scope of the present application, appropriate changes and modifications to the above embodiments are within the scope of protection claimed in the present application.

Claims

1. A magnetic biochemical integrated intensive and efficient processing system, characterized by: It includes a magnetic powder intelligent dosing system, a magnetic biochemical system, a magnetic precipitation system, a sludge hydrolysis acidification system and a magnetic powder recovery system. The magnetic biochemical system includes a magnetic anaerobic tank, a magnetic anoxic tank and a magnetic aerobic tank arranged in sequence according to the direction of water flow, and a nitrification liquid reflux pipeline is arranged between the magnetic aerobic tank and the magnetic anoxic tank. The magnetic precipitation system comprises an activated carbon tank, a magnetic coagulation tank, a magnetic flocculation tank and a magnetic precipitation tank which are sequentially arranged after the magnetic aerobic tank; The magnetic powder intelligent dosing system is used to add magnetic powder to the magnetic anaerobic tank in a timely and quantitative manner. The added magnetic powder enters the magnetic anaerobic tank and combines with the extracellular secretions of the activated sludge in the magnetic anaerobic tank to form magnetized activated sludge with the magnetic powder as the crystal nucleus. The outlet pipeline at the bottom of the magnetic sedimentation tank is respectively connected with a first pipeline and a second pipeline. The first pipeline is a magnetic mud return pipeline, which is used to return the magnetic powder and activated sludge to the magnetic anaerobic tank; the second pipeline is provided with the magnetic powder recovery system, which is used to separate the magnetic powder and the residual sludge. The separated magnetic powder enters the magnetic anaerobic tank for continued use, and the separated residual sludge enters the sludge hydrolysis acidification system; The sludge hydrolysis and acidification system comprises a sludge hydrolysis and acidification device, which is used to convert macromolecular organic matter in the residual sludge into small molecular organic matter, and the obtained supernatant is introduced into the magnetic anaerobic tank as a carbon source, and the obtained bottom sludge is discharged to a sludge dewatering workshop connected to the sludge hydrolysis and acidification device.

2. The magnetic biochemical integrated intensive and efficient treatment system according to claim 1, characterized in that: The magnetic powder intelligent dosing system comprises a silo, a stirring mechanism, a weighing sensor and a PLC control cabinet. The silo is located directly above the magnetic anaerobic tank. The stirring mechanism is used to stir the magnetic powder in the silo to prevent it from agglomerating and arching. The PLC control cabinet is used to control the amount of magnetic powder put into the magnetic anaerobic tank and the time of putting it in.

3. The magnetic biochemical integrated intensive and efficient treatment system according to claim 1, characterized in that: The magnetic anaerobic tank, magnetic anoxic tank, activated carbon tank, magnetic coagulation tank and magnetic flocculation tank are all equipped with agitators. A ceiling is set above the magnetic anaerobic tank and a rail vehicle for hoisting magnetic powder is provided. A pulse aeration component is arranged in the magnetic aerobic tank. The pulse aeration component includes a pulse perforated aerator and a tubular microporous aerator. Aeration is performed in a staggered manner with the pulse perforated aerator at the bottom and the tubular microporous aerator at the top.

4. The magnetic biochemical integrated intensive and efficient treatment system according to claim 1, characterized in that: A heavy-load scraper is arranged in the magnetic sedimentation tank, and a magnetic mud reflux pump and a magnetic powder recovery pump are arranged on the first pipeline and the second pipeline respectively.

5. The magnetic biochemical integrated intensive and efficient treatment system according to claim 1, characterized in that: The magnetic powder recovery system comprises a magnetic mud disperser and a magnetic powder separator. The impeller of the magnetic mud disperser is made of wear-resistant alloy material. The magnetic powder is Fe3O4 or Fe3O4 modified with diatomaceous earth, peanut shell or straw, and the particle size of the magnetic powder is 400-800 mesh.

6. The magnetic biochemical integrated intensive and efficient treatment system according to claim 1, characterized in that: The activated carbon adsorption tank is used to add activated carbon for emergency treatment when COD reaches the limit value. The magnetized activated sludge enters the activated carbon adsorption tank from the magnetic aerobic tank to react with the activated carbon, then enters the magnetic coagulation tank for coagulation and flocculation with PAC, then flows into the magnetic flocculation tank for flocculation with PAM, and then is separated from the mud and water in the magnetic sedimentation tank.

7. The magnetic biochemical integrated intensive and efficient treatment system according to claim 1, characterized in that: The bottom corners of the magnetic anaerobic pool, the magnetic anoxic pool and the magnetic aerobic pool are chamfered.

8. A magnetic biochemical integrated intensive and efficient treatment process, characterized in that: It adopts a magnetic biochemical integrated intensive and efficient treatment system as described in any one of claims 1 to 7, and the treatment process includes the following steps: a. Start-up culture of activated sludge system; Using COD in raw water or sodium acetate as carbon source, adding a certain amount of activated sludge for cultivation, When the concentration of activated sludge rises to above 1500mg / L, 200-500mg / L of magnetic powder is gradually added through the magnetic powder intelligent dosing system for initial taming. The magnetic mud formed in this process is refluxed through the magnetic mud reflux pump. When the activated sludge concentration increases to above 5000mg / L, gradually add the magnetic powder content to 500-1000mg / L and ensure the stable operation of the system; b. The sewage to be treated is passed into the magnetic anaerobic tank, and is evenly mixed with the magnetic mud and magnetic powder in the magnetic anaerobic tank under the action of stirring to form a magnetized activated sludge with the magnetic powder as the crystal nucleus; denitrification reaction occurs in the magnetic anoxic tank, and nitrification reaction occurs in the magnetic aerobic tank; c. The sewage to be treated enters the activated carbon pool, and activated carbon is added according to whether the COD exceeds the standard; d. The sewage to be treated enters the magnetic coagulation tank to react with PAC, and then enters the magnetic flocculation tank to react with PAM; then enters the magnetic sedimentation tank, and the supernatant water meets the discharge standards; part of the settled sludge is returned to the magnetic anaerobic tank through the first pipeline to transfer the magnetic powder and activated sludge, and the other part is transported to the magnetic powder recovery system through the second pipeline to separate the magnetic powder and the remaining sludge. The separated magnetic powder enters the magnetic anaerobic tank to participate in the reaction, and the separated remaining sludge enters the sludge hydrolysis acidification system; e. The sludge hydrolysis and acidification system converts the macromolecular organic matter in the residual sludge into small molecular organic matter, and the obtained supernatant is introduced into the magnetic anaerobic tank as a carbon source, and the obtained bottom sludge is discharged to the sludge dewatering workshop connected to the sludge hydrolysis and acidification device.

9. The magnetic biochemical integrated intensive and efficient treatment process according to claim 8, characterized in that: In step b, in the magnetic anoxic tank, the magnetized activated sludge is mixed with the nitrified liquid returned from the magnetic aerobic tank, and then denitrification reaction is carried out using the carbon source in the sewage to be treated; under the disturbance of aeration in the magnetic aerobic tank, the magnetized activated sludge undergoes nitrification reaction.

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