Carbon capture and phosphorus removal device and method

Abstract

Provided are a carbon capture and phosphorus removal device and a carbon capture and phosphorus removal method in sewage treatment. 【Solution means】The device includes a sewage tank 1, an SBR reactor 2 communicating with the sewage tank, a denitrification reaction tank 3 communicating with the drain pipe in the middle of the SBR reactor, and an anaerobic digestion tank 4 communicating with the sludge discharge pipe at the bottom of the SBR reactor. A biochar sludge removal device 6 is provided on the anaerobic digestion tank side. The method includes steps of S1, water injection and stirring, S2, SBR treatment, S3, circulation, S4, sludge fermentation, and S5, magnetic biochar recovery. In the present invention, magnetic biochar is put into a high-load contact stabilization SBR reactor to synchronously promote the adsorption of organic carbon and phosphorus in sewage, further enhance the capture effect of dissolved organic matter, promote the adsorption of organic carbon and phosphorus in sewage, and ensure a stable and efficient carbon capture and phosphorus removal effect.

Description

[Technical field]

[0001] The present invention relates to the technical field of wastewater treatment, and in particular to a carbon capture and phosphorus removal device and method. do. [Background technology]

[0002] In the prior art, the activated sludge process is mainly used for wastewater treatment. There are problems with wastewater treatment, such as high energy consumption and high carbon emissions. The efficient capture of organic carbon in the influent water is a key factor in wastewater planning. This is one of the important measures to achieve low-carbon operation of plants. The main technologies are chemical strengthening primary treatment, high-load membrane separation technology, and high-load activated sludge method. This technique can achieve high organic carbon capture efficiency, but it relies on large amounts of coagulant injection and high investment costs. ,Operational costs are high, making large-scale popularization and application difficult. Biochar is an ideal adsorbent for soluble organic matter. However, biochar is difficult to separate from water. In addition, Fe 3 O 4 into the biochar matrix to produce magnetic biochar. Preparation of Fe is an effective way to solve the problem. 3 O 4 is complexed with phosphate Therefore, the high-loading magnetic biochar-based To explore the technology of enhancing carbon capture in wastewater in activated sludge process and the optimal control of the process At present, magnetic biochar in wastewater treatment can be used as a base for the development of new magnetic materials. There remains a need for further research into the combined use of activated sludge with high loads. Summary of the Invention

[0003] The present invention provides a carbon capture and phosphorus removal device, a sewage tank provided with a first stirrer inside, an SBR reactor communicating with the sewage tank, wherein the SBR reactor is a cylindrical bin body with a hollow interior, a drain pipe is connected to the middle part of the outer wall of the SBR reactor, a sludge discharge pipe and an aeration pipe are connected to the lower part of the outer wall of the SBR reactor, a second stirrer extending to the bottom of the inside of the SBR reactor is provided at the top of the SBR reactor, an electromagnet is provided at the bottom of the SBR reactor, the sewage tank and the SBR reactor communicate with each other through a sewage pipe, and a sewage pump is provided on the sewage pipe, an SBR reactor, a denitrification reaction tank communicating with the drain pipe, an anaerobic digestion tank communicating with the sludge discharge pipe, a biogas discharge pipe is provided at the top of the anaerobic digestion tank, and a third stirrer is provided at the bottom of the anaerobic digestion tank, an anaerobic digestion tank, a dozer provided on one side of the top of the SBR reactor, a sludge removal device communicating with the anaerobic digestion tank, the sludge removal device includes a bin body, an ultrasonic generator is provided inside the bin body, a first motor is provided at the top of the bin body, a rotating shaft is connected to the output shaft of the first motor, a plurality of hydraulic telescopic rods are provided on the side wall of the rotating shaft, a guide plate is fixedly connected to the lower end of each hydraulic telescopic rod, the guide plate has a two-layer structure, the upper layer is made of austenitic stainless steel material, and the lower layer is martensitic stainless steel. Here, the austenitic stainless steel material has no magnetic attraction effect with magnetic biochar, while the martensitic stainless steel has a magnetic attraction effect with magnetic biochar, a second motor is connected to the top end of each hydraulic telescopic rod, A plurality of stirring rods are provided on the outer wall, a reflux tank is provided on the side wall of the bin body, and a scraper is provided on the side of the reflux tank. The reflux tank is connected to the dozer via a reflux pipe. It is provided with a sludge removal device. As one aspect of the present invention, an air pump is provided at the end of the aeration pipe, a drain pump is provided on the drain pipe, and a sludge discharge pump is provided on the sludge discharge pipe. In this application, by operating the air pump to control the aeration volume, controlling the drainage flow rate and velocity through the drain pump, and controlling the sludge discharge amount through the sludge discharge pump, the entire system can operate stably. As one aspect of the present invention, the electromagnet has a disc-shaped structure, and the cross-sectional area of the electromagnet is 75-100% of the bottom area of the SBR reactor. In this application, the sedimentation time of sludge and magnetic biochar can be easily controlled by the electromagnet, and the sedimentation efficiency of sludge and magnetic biochar can be ensured by adjusting the coating area of the electromagnet. As one aspect of the present invention, the denitrification reaction tank is a rectangular parallelepiped box provided with a plurality of floating filler assemblies inside. The floating filler assembly is composed of a mesh box and a polyethylene material filled inside the mesh box. The anaerobic digestion tank includes a cylindrical tank body with an empty interior and a heat insulation layer wrapping the outside of the tank body. In this application, the cylindrical bin body facilitates the mixing, stirring and reaction of the sewage inside the SBR reactor. The floating filler assembly in the denitrification reaction tank enables deep denitrification of the sewage, and the heat insulation layer enables the sludge inside the anaerobic digestion tank to be easily fermented and reacted. As one aspect of the present invention, a plurality of grooves are provided on the side wall of the rotating shaft. Each of the hydraulic telescopic rods is provided with a plurality of protrusions that fit into the grooves. When the hydraulic telescopic rod extends or contracts, the protrusions slide in the grooves, thereby driving the rotating shaft to rotate. As one aspect of the present invention, the sludge discharge pipe is provided with a valve. In this application, by adjusting the opening and closing degree of the valve, the sludge discharge amount can be controlled. As one aspect of the present invention, the control panel is provided with a display screen. The display screen can display parameters such as the aeration volume, drainage flow rate, and sludge discharge amount. The control panel is also provided with operation buttons. By operating the operation buttons, parameters such as the aeration volume, drainage flow rate, and sludge discharge amount can be adjusted. The Ds are provided one-to-one in each of the grooves, the guide plate has a fan-shaped structure, and a fixed block is provided inside the guide plate. The fixed block is fixedly connected to the bottom of the hydraulic telescopic rod. By moving the hydraulic telescopic rod back and forth by the second motor, the fixed block is slid up and down in the groove, and synchronously, the guide plate is driven to move up and down. A slot is provided in the upper part of the side wall of the bin body. The reflux tank is provided in the slot. A slider is provided at the bottom of the reflux tank. The slider is slidably connected to a sliding groove provided at the bottom of the slot. A hydraulic push rod is provided at a position below the slot on the side wall of the bin body. The output end of the hydraulic push rod is fixedly connected to the outside of the reflux tank. Through the hydraulic push rod, the reflux tank is driven to slide in the slot. When the reflux tank slides from the inside to the outermost side of the slot, the reflux pipe correspondingly locates directly above the reflux tank. In this application, the anaerobic digested magnetic biochar can be quickly washed and de-sludged by the de-sludging device and timely recovered. While adsorbing the magnetic biochar by the fan-shaped guide plate, the stirring effect can be enhanced. In another aspect of the present invention, both sides of the first motor are fixedly connected to the bin body through fixed rods. There are three second motors, and there are three corresponding hydraulic telescopic rods and guide plates respectively. In this application, by adjusting the number of magnetic guide plates, the washing efficiency of the magnetic biochar can be ensured while increasing the recovery speed. ​​​The present invention further provides a carbon capture and phosphorus removal method based on the above carbon capture and phosphorus removal device. This method includes the following steps: S1. Water injection and stirring: Inject sewage into the sewage tank, uniformly stir it with a first stirrer, and then transport the sewage to the SBR reactor through a sewage pipe. S2. SBR treatment: The operation mode of the SBR reactor includes a contact stage, a sedimentation stage, a drainage stage, and a stabilization stage. Contact stage: Put magnetic biochar into the SBR reactor by a dozer, the input amount of magnetic biochar is 100 - 500 mg / L. After putting it in, open the second stirrer to stir, the rotation speed is 100 - 150 rpm, and stir for 10 - 15 min. Sedimentation stage: Close the second stirrer, energize the electromagnet to form an electromagnetic field. Under the action of the electromagnetic field, promote the sedimentation of magnetic biochar and sludge, and the energization time is 10 - 30 min. Drainage stage: Open the drain pump, transport the sewage in the SBR reactor to the denitrification reaction tank through the drain pipe, carry out denitrification treatment on the sewage entering the denitrification reaction tank in the denitrification reaction tank. When the sewage in the SBR reactor is drained to half of the water level, close the drain pump. Stabilization stage: Open the air pump, aerate the sewage and sludge in the SBR reactor through the aeration pipe, continuously aerate for 40 - 50 min, control the solubility to 1.5 - 2 mg / L. While aerating, open the second stirrer to stir, the rotation speed of the second stirrer is 60 - 150 rpm. Then open the sludge discharge pump, and discharge 1 / 4 - 1 / 3 of the sludge in the SBR reactor to the anaerobic digestion tank through the sludge discharge pipe. In the SBR reactor, the biochar in the magnetic biochar plays a role in removing organic carbon in the sewage. The specific mechanism is that during the wastewater treatment process, a biofilm is formed on the surface of the biochar. That is, a synergistic effect of the adsorption of activated carbon and the oxidative decomposition of organic carbon by microorganisms occurs, The magnetic powder in the magnetic biochar plays a role in removing phosphorus. The specific mechanism is that Fe 3 O 4 forms a complex with phosphate to enhance the phosphorus removal effect. In the denitrification reaction tank, it is also necessary to treat the sewage from which organic carbon and phosphorus have been removed to denitrify it. The specific mechanism is that sludge is loaded on the floating packing assembly in the denitrification reaction tank to form a bio film. When the sewage passes through the biofilm, microorganisms decompose the nitrogen element in the sewage into gaseous nitrogen through processes such as adsorption and decomposition to achieve the purpose of denitrification. S3. Circulation: Repeat S1 and S2 to treat the sewage of the next batch. S4. Sludge fermentation: Adjust the internal temperature of the anaerobic digester to 37 ± 0.2 °C, and the stirring speed of the third stirrer is 100 - 120 rpm. Ferment for 20 - 25 days to obtain the remaining sludge, and collect the biogas inside the anaerobic digester through the biogas discharge pipe. Then discharge the remaining sludge into the sludge treatment device. In the anaerobic digester, reuse the remaining sludge to produce biogas through resource utilization. The specific mechanism is that during the anaerobic digestion process of the sludge, the organic matter in the sludge is converted into biogas. Anaerobic digestion includes four stages: hydrolysis, oxidation, hydrogen production, acetic acid production, and methane production. S5. Magnetic biochar recovery: Pass the remaining sludge through the bin body of the sludge treatment device, add water to the bin body, and the water addition amount is 3 - 4 times the weight of the sludge. Turn on the ultrasonic generator inside the bin body, adjust the ultrasonic output of the ultrasonic generator to 800 - 1200 W for ultrasonic treatment, and at the same time turn on the first motor. Rotate the rotating shaft by the first motor to guide the magnetic biochar to the guide plate ​ Adsorb it on the lower surface of the trough, control one of the second motors every 5 minutes, and extend and contract the corresponding hydraulic telescopic rod to move the guide plate upward to the height of the reflux tank. Since the rotating shaft rotates the guide plate, the scraper scrapes off the magnetic biochar adhered to the lower surface of the guide plate and drops it into the reflux tank. The magnetic biochar collected in the reflux tank is transported to the dozer through the reflux pipe for reuse. Here, the preparation method of the magnetic biochar is as follows: Mix the biomass raw material and stainless steel small balls at a mass ratio of 1:100, load them into a stainless steel polishing tank for polishing, and then pass through a 200-mesh sieve to obtain biomass powder. The diameter of the stainless steel small balls is less than 3 mm. Mix the biomass powder and magnetic powder at a mass ratio of 1:2 - 4, load them into a planetary ball mill for ball milling. The planetary ball mill operates at a rotational speed of 300 - 400 rpm for 10 - 12 h. After taking it out, wash it alternately 3 times with ultrapure water and ethanol, and dry it at 60 - 70 °C to obtain magnetic biochar. The biomass raw material is any one of coconut shells, wood chips or rice husk biochar. The magnetic powder is Fe O powder, and the diameter of the magnetic powder is less than 2 mm. 3 O 4 powder, and the diameter of the magnetic powder is less than 2 mm.

Advantages of the Invention

[0004] The present invention has the following beneficial effects. (1) In the present invention, magnetic biochar is put into a high-load contact stabilization SBR reactor. The magnetic biochar not only functions as an attachment carrier for microorganisms, but also forms a complex with phosphorus, synchronously promoting the adsorption of organic carbon and phosphorus in sewage, and under a certain stirring action, the uniform distribution of the flow field of the reaction flow pattern The effects can be achieved, the contact efficiency among sewage, sludge and magnetic biochar can be enhanced, the capture effect of dissolved organic matter can be further enhanced, the adsorption of organic carbon and phosphorus in sewage can be promoted, and while ensuring a stable and efficient carbon capture and phosphorus removal effect, the magnetic substances in the magnetic biochar also exert a magnetic effect on microorganisms, and the adsorption of organic carbon and phosphorus in sewage and the subsequent anaerobic digestion of sludge and the energy resource recovery efficiency can be further improved. (2) The device of the present invention adopts an external electromagnet. When the SBR reactor operates until the sedimentation stage, the electromagnet is energized to form an electromagnetic field, promoting the rapid sedimentation of magnetic biochar, and realizing the synchronous rapid sedimentation of sludge due to the adsorption of biochar on the sludge, improving the sludge sedimentation efficiency, and thus realizing the high-efficiency cut-off of particulate and colloidal organic carbon, shortening the hydraulic retention time, and greatly improving the shock load resistance capacity of the reactor. (3) The method of the present invention can perform anaerobic digestion treatment on the discharged mixture of magnetic biochar and sludge, greatly improving the biogas yield, shortening the startup time of the anaerobic digester, increasing the methane content in the biogas, improving the sewage energy conversion and resource utilization efficiency, and the magnetic biochar after anaerobic digestion can be easily reused after simple washing. The equipped magnetic biochar sludge removal device has a simple structure, is easy to operate, and operates stably. Finally, while effectively improving the capture efficiency of organic carbon in sewage, it also has a good removal effect on phosphorus, has a fast sludge sedimentation rate, consumes less energy and materials, and can achieve a stable, high-efficiency and low-energy-consuming sewage carbon capture and phosphorus removal effect.

Brief Description of the Drawings

[0005]

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[0006] [Explanation of reference signs] 1 Sewage tank 11 First stirrer 12 Sewage pipe 13 Sewage pump 2 SBR reactor 21 Drain pipe 22 Sludge discharge pipe 23 Aeration pipe 24 Second stirrer 25 Electromagnet 26 Air pump 27 Drain pump 28 Sludge discharge pump 3 Denitrification reaction tank 31 Flotation filler assembly 4 Anaerobic digester 41 Biogas discharge pipe 42 Third stirrer 43 Heat insulation layer 44 Tank body 5 Dozer 51 Return pipe 6 Biochar de-sludging device 61 Biochar return tank 611 Slider 612 Scraper 62 Silo body 621 Slot 622 Sliding groove 63 First motor 631 Fixed rod 64 Rotating shaft 641 Groove 642 Stirring rod 65 Second motor 66 Hydraulic telescopic rod 67 Guide plate 671 Fixed block 68 Hydraulic push rod 69 Ultrasonic generator

Embodiment for Carrying out the Invention

[0007] Example 1: The carbon capture and phosphorus removal device includes a sewage tank 1 for storing sewage. As shown in FIG. 2, a first stirrer 11 is provided inside the sewage tank 1, and an SBR reactor 2 communicating with the sewage tank 1. As shown in FIGS. 1 and 2, the SBR reactor 2 is a cylindrical silo body with a hollow interior. A drain pipe 21 is connected to the middle of the outer wall of the SBR reactor 2, a sludge discharge pipe 22 and an aeration pipe 23 are connected to the lower part of the outer wall of the SBR reactor 2. An air pump 26 is provided at the end of the aeration pipe 23, and a drainage pump 27 is provided on the drain pipe 21, a sludge discharge pump 28 is provided on the sludge discharge pipe 22, and a second stirrer 24 extending to the bottom inside the SBR reactor 2 is provided at the top of the SBR reactor 2. Four are provided on the stirring shaft of the second stirrer 24 A stirring paddle is provided, and the ratio of the diameter of the stirring paddle to the radius of the SBR reactor 2 is 0.6:1 and the distance from the stirring paddle at the bottommost part to the bottom of the SBR reactor 2 is 15% of the height of the SBR reactor 2 An electromagnet 25 is provided at the bottom of the SBR reactor 2. The electromagnet 25 has a disc-shaped structure, and the cross-sectional area of the electromagnet 25 is 90% of the bottom area of the SBR reactor 2. The sewage tank 1 and the SBR reactor 2 are communicated through a sewage pipe 12, and a sewage pump 13 is provided on the sewage pipe 12 Here, the air pump 26, the drain pump 27, the sludge discharge pump 28, and the sewage pump 13 used in this embodiment are all existing products. For example, the air pump 26 employs an RB-51DH-2 / 2.2kw sewage aeration vacuum pump, the drain pump 27 and the sewage pump 13 employ a 150ZW180-14 self-priming sewage suction pump, and the sludge discharge pump 28 may employ an 80ZJQ70-12-5.5 sludge discharge pump. It should be noted that this is only an example here, and in actual applications, it can be adjusted and replaced according to the situation, and it is not particularly limited in the embodiments of this application Furthermore, it should be noted that the drain pipe 21, the sludge discharge pipe 22, the aeration pipe 23, and the sewage pipe 12 described in the embodiments of this application are all of normal piping structures. Here, the drain pipe 21 is used to transport the sewage in the SBR reactor 2 to the denitrification reaction tank 3, the sludge discharge pipe 22 is used to discharge the sludge in the SBR reactor 2 to the anaerobic digestion tank 4, the aeration pipe 23 is used to supply the air compressed by the air pump 26 into the SBR reactor 2, and the sewage pipe 12 is used to introduce the sewage stored in the sewage tank 1 into the SBR reactor 2. The denitrification reaction tank 3 communicating with the drain pipe 21 is provided. As shown in FIGS. 1 and 9, the denitrification reaction tank 3 ​​​​​​​​​​​​​​​is a rectangular parallelepiped box body internally provided with four floating filling material assemblies 31, and the floating filling material assembly 31 is composed of a mesh box and a polyethylene material filled inside the mesh box. The polyethylene material is a commercially available product, and the density is 0.95 g / cm and 3 is equipped with an anaerobic digester 4 communicating with the sludge discharge pipe 22. As shown in FIG. 2, the anaerobic digester 4 includes a cylindrical tank body 44 with a hollow interior and a heat insulation layer 43 wrapping the outside of the tank body 44. A biogas discharge pipe 41 is provided at the top of the anaerobic digester 4, and a third stirrer 4 2 is provided at the bottom of the anaerobic digester 4. The heat insulation layer 43 is a commercially available polystyrene board with a thickness of 4 cm. It is equipped with a dozer 5 provided on the top side of the SBR reactor 2. As shown in FIG. 1, the dozer 5 used in the embodiment of the present application is a drug feeding device of the prior art, for example, it may be a solid powder fully automatic intelligent biological dozer manufactured by Shengmao Livestock Co., Ltd. It is equipped with a sludge removal device 6 communicating with the anaerobic digester 4. As shown in FIGS. 2 to 4, the sludge removal device 6 includes a bin body 62. An electronically controlled bin door is provided between the bin body 62 and the anaerobic digester 4. An ultrasonic generator 69 is provided inside the bin body 62, and a first motor 63 is provided at the top of the bin body 62. The first motor 63 is a geared motor. Both sides of the first motor 63 are fixedly connected to the bin body 62 through fixed rods 63 1. A rotating shaft 64 is connected to the output shaft of the first motor 63. Three hydraulic telescopic rods 66 are provided on the side wall of the rotating shaft 64. A guide plate 67 is fixedly connected to the lower end of each hydraulic telescopic rod 66. The guide plate 67 has a two-layer structure and the upper layer may be an austenitic stainless steel material, for example, a 304 stainless steel plate manufactured by Hangdong Metal Co., Ltd., and the lower layer is a martensitic stainless steel, for example, 4 manufactured by Hangdong Metal Co., Ltd. The first motor 63 is a geared motor, and both sides of the first motor 63 are fixedly connected to the bin body 62 through fixed rods 631. A rotating shaft 64 is connected to the output shaft of the first motor 63. Three hydraulic telescopic rods 66 are provided on the side wall of the rotating shaft 64. A guide plate 67 is fixedly connected to the lower end of each hydraulic telescopic rod 66. The guide plate 67 has a two-layer structure and the upper layer may be an austenitic stainless steel material, for example, a 304 stainless steel plate manufactured by Hangdong Metal Co., Ltd., and the lower layer is a martensitic stainless steel, for example, 4 manufactured by Hangdong Metal Co., Ltd. 66, and a guide plate 67 is fixedly connected to the lower end of each hydraulic telescopic rod 66. The guide plate 67 has a two-layer structure and the upper layer may be an austenitic stainless steel material, such as a 304 stainless steel plate manufactured by Hangdong Metal Co., Ltd., and the lower layer is a martensitic stainless steel, such as 4 manufactured by Hangdong Metal Co., Ltd. manufactured by Hangdong Metal Co., Ltd. It may be a 10 stainless steel plate. In a specific embodiment, for example, the thickness of the upper layer may be 5 mm and the thickness of the lower layer may be 2 mm. The martensitic stainless steel in the lower layer can adsorb the magnetic biochar doped in the sludge. Each hydraulic telescopic rod 66 has a second motor 65 connected to the top end thereof. The second motor 65 is a push rod motor. A plurality of stirring rods 642 are provided on the outer wall of the rotating shaft 64. A reflux tank 61 is provided on the side wall of the silo body 62 and a scraper 612 is provided on the side of the reflux tank 61. The reflux tank 61 is connected to the dozer 5 through a reflux pipe 51 Here, the ultrasonic generator 69 used in the embodiment of the present application is a product of the prior art. For example it may be an ultrasonic vibration generator manufactured by Ke'er Ultrasonic Company. The first motor 63 used in the embodiment of the present application is a geared motor manufactured by Hebei Tianqiao Machinery Equipment Manufacturing Company. The hydraulic telescopic rod 6 6 and the second motor 65 are a set of equipment. For example, they are DT DTZ type electric hydraulic push rods manufactured by Beijing Botian Shunda Machinery and Electric Company It should be noted that the reflux pipe 51 described in the embodiment of the present application has a normal pipe structure and is used to divert the magnetic biochar collected in the reflux tank 61 to the dozer 5. A solid particle transport pump manufactured by Yuneng Transport Equipment Factory is installed on the reflux pipe 51 As shown in FIGS. 4 to 8, a plurality of grooves 641 are provided on the side wall of the rotating shaft 64. Each hydraulic telescopic rod 66 is arranged in a one-to-one correspondence in each groove 641. The guide plate 67 has a fan-shaped structure and a fixed block 671 is provided inside the guide plate 67. The bottom of the hydraulic telescopic rod 66 is fixedly connected to the fixed block 671. The second motor 65 drives the hydraulic telescopic rod 66 to expand and contract to slide the fixed block 671 up and down in the groove 641 ​​​​​​​​​ It moves and is driven to synchronously move the guide plate 67 up and down, and the side wall of the bin body 62 is provided with a slot 621 at the upper part, the reflux tank 61 is provided in the slot 621, and the reflux tank 6 1 is provided with a slider 611 at the bottom, and the slider 611 is provided at the bottom of the slot 621 and is slidably connected to a sliding groove 622 provided at the bottom of the slot 621. A hydraulic push rod 68 is provided at a position below the slot 621 on the side wall of the bin body 62 and the output end of the hydraulic push rod 68 is fixedly connected to the outside of the reflux tank 61. The reflux tank 61 is driven to slide in the slot 621 through the hydraulic push rod 68 When the reflux tank 61 slides from the inside of the slot 621 to the outermost side, the reflux pipe 51 correspondingly locates directly above the reflux tank 61 。 。 。 The hydraulic push rod 68 used in the embodiment of the present application may be a product of the prior art, for example, a large-thrust DC motor telescopic rod manufactured by Beijing Zhongdian Hongli Machinery and Electric Company 。 In addition, the reflux tank 61 described in the embodiment of the present application has a groove-like structure with an open upper end, and the slot 621 is a rectangular opening opened on the side wall of the desilting bin 62. Its shape and size are adapted to the structure of the reflux tank 61 。 。 Embodiment 2: This embodiment is different from Embodiment 1 in that two second motors 6 5 are provided on the rotating shaft 64. Correspondingly, the numbers of the guide plate 67, the slider 611 and the hydraulic telescopic rod 66 are all two 。 Embodiment 3: This embodiment is different from Embodiment 1 in that four second motors 6 5 are provided on the rotating shaft 64. Correspondingly, the numbers of the guide plate 67, the slider 611 and the hydraulic telescopic rod 66 are all four 。 Explanation: When the set number of the guide plate 67 increases, the adsorption effect of the magnetic biochar becomes better, but , since the degree of difficulty in scraping by the scraper 612 also increases, it is necessary to reasonably set the number of the guide plates 67, and the setting parameters of Example 1 are optimal. Example 4: This example is different from Example 1 in the following points. The cross-sectional area of the electromagnet 25 is 85% of the bottom area of the SBR reactor 2. Example 5: This example is different from Example 1 in the following points. The denitrification reaction tank 3 is a box body in which six floating packing assemblies 31 are arranged, and the density of the polystyrene material filled inside the mesh box is 0.92 g / cm 3 . Example 6: The carbon capture and phosphorus removal method described in this example includes the following steps based on the carbon capture and phosphorus removal device of Example 1: S1. Water injection and stirring: Inject the sewage into the sewage tank 1, stir it evenly by the first stirrer 11, and then transport the sewage to the SBR reactor 2 through the sewage pipe 12, S2. SBR treatment: The operation mode of the SBR reactor 2 includes a contact stage, a sedimentation stage, a drainage stage, and a stabilization stage, Contact stage: Put the magnetic biochar into the SBR reactor 2 by the dozer 5. The input amount of the magnetic biochar is 200 mg / L. After the input, turn on the second stirrer 24 to stir, and the rotation speed is 100 rpm, and stir for 15 min, Sedimentation stage: Turn on the second stirrer 24, energize the electromagnet 25 by an external power source, and form an electromagnetic field when the electromagnet 25 is energized. Under the action of the electromagnetic field, promote the sedimentation of the magnetic biochar and the sludge. The energization time is 15 min, Drainage stage: Open the drain pump 27, transport the sewage in the SBR reactor 2 to the denitrification reaction tank 3 through the drain pipe 21. The sewage entering the denitrification reaction tank 3 is denitrified in the denitrification reaction tank 3. When the sewage in the SBR reactor 2 is drained to half of the water level, close the drain pump 27, Stabilization stage: Keep the sewage in the SBR reactor 2 stationary for 15 min, and then open the drain pump 27 to drain the remaining sewage in the SBR reactor 2. ​​Stabilization stage: Open the air pump 26, and aerate the sewage and sludge in the SBR reactor 2 through the aeration pipe 23. Aerate for 50 minutes continuously, control the dissolved oxygen concentration at 1.6 mg / L, and while aerating, Open the second stirrer 24 to stir, the rotation speed of the second stirrer 24 is 80 rpm, and then Open the sludge discharge pump 28, and discharge 1 / 3 of the sludge in the SBR reactor 2 through the sludge discharge pipe 22 to the anaerobic digester 4. S3, Circulation: Repeat S1 and S2 to treat the sewage of the next batch. S4, Sludge fermentation: Adjust the internal temperature of the anaerobic digester 4 to 37 °C, and adjust the stirring speed of the third stirrer 42 to 110 rpm, ferment for 22 days to obtain the remaining sludge, and collect the biogas in the anaerobic digester 4 through the biogas discharge pipe 41. Then discharge the remaining sludge into the sludge dewatering device 6. S5, Magnetic biochar recovery: Pass the remaining sludge through the bin body 62 of the sludge dewatering device 6, add water to the bin body 62, and the water addition amount is 3.5 times the weight of the sludge. Turn on the ultrasonic generator 69 inside the bin body 62, adjust the ultrasonic output of the ultrasonic generator 69 to 1000 W for ultrasonic treatment. At the same time, turn on the first motor 63, rotate the rotating shaft 64 by the first motor 63, and drive the magnetic biochar to be adsorbed on the lower surface of the guide plate 67. Control one of the second motors 65 every 5 minutes to extend and retract the corresponding hydraulic telescopic rod 66, and drive the guide plate 67 to move upward to the height of the reflux tank 61. Since the rotating shaft 64 rotates the guide plate 67, the scraper 612 scrapes off the magnetic biochar attached to the lower surface of the guide plate 67 and drops it into the reflux tank 61. Transport the magnetic biochar recovered in the reflux tank 61 to the dozer 5 through the reflux pipe 51 for reuse. Here, the preparation method of magnetic biochar is as follows: Mix the biomass raw material and stainless steel small balls at a mass ratio of 1:100, load them into a stainless steel polishing tank, polish them, and then pass them through a 200 mesh sieve to obtain biomass powder. The diameter of the stainless steel small balls is less than 3 mm Mix the biomass powder and magnetic powder at a mass ratio of 1:3, load them into a planetary ball mill, and perform ball milling. The planetary ball mill operates for 11 h at a rotational speed of 350 rpm, take it out and then wash it alternately 3 times with ultrapure water and ethanol, and dry it at 65 °C to obtain magnetic biochar. The biomass raw material is coconut shell biochar, The magnetic powder is Fe 3 O 4 powder, and the diameter of the magnetic powder is less than 2 mm. Example 7: This example is different from Example 6 in the following points Contact stage: The input amount of magnetic biochar is 100 mg / L, the rotational speed is 120 rpm, stir for 12 min, Sedimentation stage: The energization time is 10 min, Stabilization stage: The continuous aeration time is 40 min, control the dissolved oxygen concentration to 1.5 mg / L, The rotational speed of the second stirrer 24 is 60 rpm, and 1 / 4 of the sludge in the SBR reactor 2 is discharged to the anaerobic digester 4 through the sludge discharge pipe 22. Example 8: This example is different from Example 6 in the following points Contact stage: The input amount of magnetic biochar is 400 mg / L, the rotational speed is 130 rpm and stir for 13 min, Sedimentation stage: The energization time is 20 min, Stabilization stage: The continuous aeration time is 45 min, control the dissolved oxygen concentration to 1.8 mg / L, The rotational speed of the second stirrer 24 is 120 rpm, and 1 / 4 of the sludge in the SBR reactor 2 is discharged to the anaerobic digester 4 through the sludge discharge pipe 22. Example 9: This example is different from Example 6 in the following aspects: Contact stage: The input amount of magnetic biochar is 500 mg / L, and the rotation speed is 150 rpm. Stir for 10 min. Sedimentation stage: The energization time is 30 min. Stabilization stage: The continuous aeration time is 50 min, the dissolved oxygen concentration is controlled at 2 mg / L, and the rotation speed of the second stirrer 24 is 150 rpm. One-third of the sludge in the SBR reactor 2 is discharged into the anaerobic digester 4 through the sludge discharge pipe 22. Explanation: In Examples 6 to 9, the parameter of each step of the SBR treatment in S2 is evaluated. When the amount of sewage to be treated is small, select the parameter combination in Example 6. When the amount of sewage to be treated is large, select the parameter combination in Example 8. Example 10: This example is different from Example 6 in the following aspects: When preparing magnetic biochar, mix biomass powder and magnetic powder at a mass ratio of 1:2 and load them into a planetary ball mill for ball milling. The planetary ball mill operates at a rotation speed of 300 rpm for 10 h and is dried at 60 °C. The biomass raw material is rice husk biochar. Example 11: This example is different from Example 6 in the following aspects: When preparing magnetic biochar, mix biomass powder and magnetic powder at a mass ratio of 1:4 and load them into a planetary ball mill for ball milling. The planetary ball mill operates at a rotation speed of 400 rpm for 12 h and is dried at 70 °C. The biomass raw material is wood chip biochar. Explanation: In Examples 6, 10, and 11, the main influencing factor parameter is the mass ratio of biomass powder and magnetic powder. The higher the proportion of magnetic powder, the better the SBR treatment and recovery effect, but it may have an inhibitory effect on the sludge fermentation in S3. Overall In Examples 6, 10, and 11, the main influencing factor parameter is the mass ratio of biomass powder and magnetic powder. The higher the proportion of magnetic powder, the better the SBR treatment and recovery effect, but it may have an inhibitory effect on the sludge fermentation in S3. Overall In Examples 6, 10, and 11, the main influencing factor parameter is the mass ratio of biomass powder and magnetic powder. The higher the proportion of magnetic powder, the better the SBR treatment and recovery effect, but it may have an inhibitory effect on the sludge fermentation in S3. Overall In Examples 6, 10, and 11, the main influencing factor parameter is the mass ratio of biomass powder and magnetic powder. The higher the proportion of magnetic powder, the better the SBR treatment and recovery effect, but it may have an inhibitory effect on the sludge fermentation in S3. Overall In Examples 6, 10, and 11, the main influencing factor parameter is the mass ratio of biomass powder and magnetic powder. The higher the proportion of magnetic powder, the better the SBR treatment and recovery effect, but it may have an inhibitory effect on the sludge fermentation in S3. Overall Explanation: In Examples 6, 10, and 11, the main influencing factor parameter is the mass ratio of biomass powder and magnetic powder. The higher the proportion of magnetic powder, the better the SBR treatment and recovery effect, but it may have an inhibitory effect on the sludge fermentation in S3. Overall In Examples 6, 10, and 11, the main influencing factor parameter is the mass ratio of biomass powder and magnetic powder. The higher the proportion of magnetic powder, the better the SBR treatment and recovery effect, but it may have an inhibitory effect on the sludge fermentation in S3. Overall In Examples 6, 10, and 11, the main influencing factor parameter is the mass ratio of biomass powder and magnetic powder. The higher the proportion of magnetic powder, the better the SBR treatment and recovery effect, but it may have an inhibitory effect on the sludge fermentation in S3. Overall In consideration of this, the parameters of Example 1 are preferable. Example 12: This example is different from Example 6 in the following points S4, sludge fermentation: Adjust the internal temperature of the anaerobic digester 4 to 36.8 °C, and adjust the stirring speed of the third stirrer 42 to 100 rpm, and ferment for 20 days. Example 13: This example is different from Example 6 in the following points S4, sludge fermentation: Adjust the internal temperature of the anaerobic digester 4 to 37.2 °C, and adjust the stirring speed of the third stirrer 42 to 120 rpm, and ferment for 25 days. Example 14: This example is different from Example 6 in the following points S5, magnetic biochar recovery: The amount of water added is 3 times the weight of the sludge, and the ultrasonic output of the ultrasonic generator 69 is adjusted to 800 W. Example 15: This example is different from Example 6 in the following points S5, magnetic biochar recovery: The amount of water added is 4 times the weight of the sludge, and the ultrasonic output of the ultrasonic generator 69 is adjusted to 1200 W.

[0008] Experimental Example 1: Regarding the apparatus and method of Example 6 of the present invention, investigate the organic carbon capture efficiency and the removal rate of phosphate in sewage. I. Experimental object: The sewage from a wastewater treatment plant in a certain city was used as the investigation object. As a result of the detection, the total COD in the sewage of this city is 217 mg / L, the soluble COD is 77 mg / L, the particulate COD is 127 mg / L, and the phosphate concentration is 3.5 mg / L. II. Test method: According to the method of Example 6, multiple sets of experiments (denoted as R1 to R3 respectively) were carried out. Here, R1 is a blank control group without the addition of biochar, R2 is added with only coconut shell biochar , and R3 is added with magnetic biochar (Example 6). After the three sets of experimental groups operated synchronously for 20 days, the contents of COD, organic carbon, and phosphate in the sewage were detected and removed When the removal rate was calculated, it was shown in Table 1 below: Table 1 Organic carbon capture efficiency and phosphate removal rate in sewage water in three sets of experiments TIFF0007691603000002.tif42158 As can be seen from Table 1, by adding magnetic biochar, the removal rate of phosphate in sewage water is significantly improved, promoting the adsorption of organic carbon and phosphorus in sewage water, and ensuring stable and efficient carbon capture · phosphorus removal effect. Experimental Example 2: Regarding the device and method of Example 7 of the present invention, investigate the organic carbon capture efficiency and the removal rate of phosphorus in sewage water. I. Experimental object: The sewage water from a wastewater treatment plant in a certain city was investigated as the object of detection. As a result, the total COD in the sewage water of this city was 289 mg / L, the soluble COD was 105 mg / L, and the particulate COD was 168 mg / L, and the phosphate concentration was 4.2 mg / L. II. Test method: According to the method of Example 7, multiple sets of experiments (denoted as R1 to R3 respectively) were carried out. Here, R1 is a blank control group without adding biochar, R2 is added with only coconut shell biochar , and R3 is added with magnetic biochar (Example 7). After the three sets of experimental groups operated synchronously for 30 days, the contents of COD, organic carbon, and phosphate in the sewage water were detected and the removal rates were calculated. As a result, it was shown in Table 2 below: Table 2 Organic carbon capture efficiency and phosphate removal rate in sewage water in three sets of experiments Table 2 Organic carbon capture efficiency and phosphate removal rate in sewage water in three sets of experiments TIFF0007691603000003.tif36159 As can be seen from Table 2, the same tendency as in Experimental Example 1 is also reflected in Experimental Example 2. The device and method of the present invention can effectively improve the capture efficiency of organic carbon in sewage water, and at the same time have a good removal effect on phosphorus , with a fast sludge sedimentation rate, low energy and material consumption, and stable Thus, it can achieve the effect of high-efficiency and low-energy-consumption sewage carbon capture and phosphorus removal. It can be seen that.

Claims

[Claim 1] A sewage tank (1) having a first agitator (11) provided therein, A SBR reactor (2) communicates with the wastewater tank (1), the SBR reactor (2) having an internal The main body of the SBR reactor (2) is a hollow cylindrical body, and a drain pipe (21) is connected to the center of the outer wall of the SBR reactor (2). A sludge discharge pipe (22) and an aeration pipe (23) are connected to the lower part of the outer wall of the SBR reactor (2). 3) is connected to the top of the SBR reactor (2) and extends to the bottom of the SBR reactor (2). A second agitator (24) is provided, and an electromagnet (25) is provided at the bottom of the SBR reactor (2). The sewage tank (1) and the SBR reactor (2) are connected to each other via a sewage pipe (12), an SBR reactor (2) having a sewage pump (13) provided on the sewage pipe (12); a denitrification reaction tank (3) communicating with the drain pipe (21); An anaerobic digestion tank (4) in communication with the sludge discharge pipe (22), A biogas discharge pipe (41) is provided at the top of the anaerobic digestion tank (4), and a third an anaerobic digestion tank (4) provided with an agitator (42); A doser (5) installed on one side of the top of the SBR reactor (2); A desludging device (6) connected to the anaerobic digestion tank (4), the desludging device (6) being a Kuramoto The warehouse body (62) includes an ultrasonic generator (69) provided inside the warehouse body (62), and the A first motor (63) is provided on the top of the warehouse body (62), and the output of the first motor (63) A rotating shaft (64) is connected to the shaft, and a plurality of hydraulic telescopic rods are provided on the side wall of the rotating shaft (64). (66) is provided, and a guide plate (67) is provided at the lower end of each hydraulic telescopic rod (66). The guide plate (67) is of a two-layer structure, the upper layer being austenitic. a lower layer being a martensitic stainless steel material, and a lower layer being a martensitic stainless steel material, A second motor (65) is connected to the top end of the telescopic rod (66), and the outer wall of the rotating shaft (64) A plurality of stirring rods (642) are provided on the top of the storage tank (62), and a reflux tank (61) is provided on the side wall of the storage tank (62). ) is provided, a scraper (612) is provided on the reflux tank (61) side, and the reflux tank (61) is a desludging device (6) connected to the dozer (5) via a return pipe (51); A carbon capture and phosphorus removal method based on a carbon capture and phosphorus removal device, comprising: S1, Pouring water and stirring: Pouring wastewater into the wastewater tank (1) and stirring it uniformly with the first stirrer (11). and then transporting the wastewater to the SBR reactor (2) via a wastewater pipe (12). S2, SBR treatment: The operation mode of the SBR reactor (2) is contact stage, sedimentation stage, drainage stage and stabilization stage. A stabilization stage is included, Contact stage: The magnetic biochar is fed into the SBR reactor (2) by the doser (5), and the magnetic biochar is The amount of charcoal added is 100 to 500 mg / L. After the addition, the second agitator (24) is opened. The mixture was stirred at a rotation speed of 100 to 150 rpm for 10 to 15 minutes. Settling stage: The second agitator (24) is closed, and the electromagnet (25) is energized. The magnetic biochar and sludge are precipitated under the action of the electromagnetic field. The interval is 10 to 30 minutes. Drain stage: Open the drain pump (27) and drain the wastewater from the SBR reactor (2) through the drain pipe (21). The wastewater that has entered the denitrification reaction tank (3) is then transported to the denitrification reaction tank (3). When the wastewater in the SBR reactor (2) is discharged to half the water level, Close (27), Stabilization stage: Open the air pump (26) and allow the air in the SBR reactor (2) to flow through the aeration pipe (23). Aerate the wastewater and sludge for 40 to 50 minutes and keep the dissolved oxygen concentration at 1.5 to 2 mg / L. The second agitator (24) is opened and agitated at the same time as the aeration, and the rotation of the second agitator (24) is controlled to be The speed is 60 to 150 rpm, and then the sludge discharge pump (28) is opened and the sludge discharge pipe ( 22) to discharge 1 / 4 to 1 / 3 of the sludge in the SBR reactor (2) into the anaerobic digester (4). With smooth steps, S3, circulation: repeating S1 and S2 to treat the next batch of wastewater; S4, sludge fermentation: The internal temperature of the anaerobic digestion tank (4) is adjusted to 37±0.2°C, and the third agitator The stirring speed of (42) is 100-120 rpm, and the remaining sludge is fermented for 20-25 days. and collect the biogas inside the anaerobic digester (4) through the biogas exhaust pipe (41). and then discharging the remaining sludge into a desludging device (6). S5, Magnetic biochar recovery: The remaining sludge is passed through the desludging device (6) and the desludging device (62) is removed. Water is added to the sludge (62), and the amount of water added is 3 to 4 times the weight of the sludge. Open the ultrasonic generator (69) and set the ultrasonic output of the ultrasonic generator (69) to 800 to 1200 W. At the same time, the first motor (63) is opened and the first motor (63) is turned on. Thus, by rotating the rotating shaft (64), the magnetic biochar is guided by the guide plate (67). The second motor (65) is controlled every 5 minutes to operate the corresponding hydraulic extension. The contraction rod (66) is extended and retracted to move the guide plate (67) upward to the height of the reflux tank (61). The rotary shaft (64) rotates the guide plate (67), so that the scraper (612) scrapes off the magnetic biochar adhering to the underside of the guide plate (67) and recirculates it. The magnetic biochar is dropped into the reflux tank (61), and the magnetic biochar collected in the reflux tank (61) is fed to the reflux pipe (51). and transporting the wastewater to a dozer (5) via the Here, the method for preparing the magnetic biochar is as follows: The steel balls were mixed in a mass ratio of 1:100 and loaded into a stainless steel polishing tank for polishing. The biomass powder was obtained by passing the stainless steel pellets through a 0.00 mesh sieve, and the diameter of the stainless steel pellets was 3 mm. The biomass powder and the magnetic powder are mixed in a mass ratio of 1:2 to 4 and milled in a planetary ball mill. The mixture was then loaded into the planetary ball mill and ball milled at a rotation speed of 300 to 400 rpm for 10 min. After operating for 12 hours, it was taken out and washed three times with ultrapure water and ethanol alternately, and then heated at 60-70°C. Drying to obtain magnetic biochar. The biomass feedstock is one of coconut shells, wood chips, and rice husk biochar; The magnetic powder is Fe ３ O ４ The magnetic powder has a diameter of less than 2 mm. This is a carbon capture and phosphorus removal method.

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