Composite powder carrier process

Abstract

The invention discloses a composite powder carrier process, and belongs to the technical field of sewage treatment. The invention relates to a composite powder carrier process, which comprises the following steps: introducing sewage to be treated into a sewage treatment tank, adding a high-density magnetic responsive composite carrier to adsorb pollutants, discharging clear water after magnetic settling separation, and keeping the composite carrier to continuously treat new sewage. The magnetic settling plate is electrified for adsorption, and a magnetic separator in the drainage pipeline is used for dual recovery of the high-density magnetic responsive composite carrier, so that the retention rate of the high-density magnetic responsive composite carrier in the sewage treatment tank during sewage treatment is increased, and the utilization rate of the high-density magnetic responsive composite carrier is increased. And the high-density magnetic responsive composite carrier is rapidly pulled to carry pollutants to settle by utilizing magnetic attraction force generated by the magnetic settling plate, so that effective separation of the pollutants and clear water is realized. The high-density magnetic response composite carrier is recycled through the retention effect of the magnetic settlement plate on the carrier and the subsequent operation of supplementing sewage to be treated, and the treatment cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a composite powder carrier process. Background Art

[0002] In the existing sewage treatment processes, the composite powder carrier technology has received wide attention due to its high-efficiency pollutant adsorption capacity and recyclability. The existing magnetic composite powder carriers have a small particle size and a density close to that of water, so they are easily lost with the effluent during sewage treatment. Especially during the drainage stage, traditional magnetic separation devices are difficult to completely intercept the carriers, resulting in a generally low recovery rate of the carriers, which not only increases the operation and maintenance costs, but the un-intercepted carriers may also cause secondary pollution to the environment after being discharged.

[0003] In addition, a silt layer will be formed in the sewage treatment tank. The silt layer contains silt and metal impurities. The silt layer will form a mixture or coverage with the carriers, thereby affecting the treatment of impurities in the sewage by the carriers. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that the interception and recovery rate of carriers in the sewage treatment tank is low during sewage treatment in the prior art, increasing the operation and maintenance costs, and to propose a composite powder carrier process.

[0005] In order to achieve the above purpose, the present invention adopts the following technical scheme: A composite powder carrier process, the composite powder carrier is used for sewage treatment, and is characterized by including the following steps: S1, the sewage to be treated is introduced into the sewage treatment tank, the flow rate is controlled by a flow control valve, and a turbidity sensor is synchronously started to monitor in real time, providing data support for the dosage of the subsequent composite powder carrier; S2, when the turbidity of the sewage in the sewage treatment tank reaches the standard, the PLC controls the metering pump to dynamically add the composite powder carrier according to the sewage volume and the sewage turbidity value in the sewage treatment tank. The composite powder carrier is a high-density magnetic-responsive composite carrier, and the high-density magnetic-responsive composite carrier is mixed with the sewage through an air supply pipeline to adsorb and treat the pollutants in the sewage; S3, after the high-density magnetic-responsive composite carrier completes the adsorption in the sewage treatment tank, the aeration is stopped and rotated, and the magnetic settling plate at the bottom of the sewage treatment tank is electrified to generate a magnetic suction force, which pulls the high-density magnetic-responsive composite carrier to quickly settle with the pollutants, separating the pollutants from the clear water. The clear water is discharged through a drainage joint, and the high-density magnetic-responsive composite carrier remains at the bottom of the sewage treatment tank; S4, the magnetic settling plate is powered off, and the sewage to be treated is replenished again. The high-density magnetic-responsive composite carrier remaining in the sewage treatment tank continues to adsorb and treat the replenished sewage.

[0006] In some embodiments, the raw material composition and ratio of the high-density magnetic-responsive composite carrier are as follows: magnetic minerals: Fe3O4 with a particle size of 50-100 nm; modified powdered activated carbon; wear-resistant and corrosion-resistant additives: Al2O3 with a particle size of 20-40 nm, and the mass ratio of the three components is 1:12-18:0.8-1.5.

[0007] In some embodiments, the preparation of the modified powdered activated carbon includes acid modification: the powdered activated carbon and nitric acid are mixed at a solid-liquid ratio of 1:4-1:6, shaken at 23±2°C for 10-12 h, and washed until neutral, where the concentration of nitric acid is 2.4-3.0 mol / L; alkali modification: the acid-modified product and ammonia water are mixed at a solid-liquid ratio of 1:5-1:7, and the shaking and washing process is repeated, where the concentration of ammonia water is 2.5-3.0 mol / L; Dry in a vacuum oven at 105-110°C for 22-24 h.

[0008] In some embodiments, the sewage treatment tank includes a support platform, on which a rotating assembly and an aeration assembly are integrated. The aeration assembly is driven by the rotating assembly to rotate, expanding the coverage range of the aeration assembly. The aeration assembly includes a plurality of aeration pipelines.

[0009] In some embodiments, the magnetic settling plate is arranged at the bottom of the sewage treatment tank, and a hydraulic jack is arranged at the bottom of the magnetic settling plate. The hydraulic jack is used to drive the magnetic settling plate to move up and down, controlling the distance between the magnetic settling plate and the aeration pipeline. The high-density magnetic-responsive composite carrier quickly settles the suspended matter through the magnetic field of the magnetic settling plate; the magnetic settling plate fixes the carrier by magnetic suction.

[0010] In some embodiments, the aeration pipeline includes a vertical pipe and an aeration pipe. There are a plurality of aeration pipelines, and a scraper is arranged at the bottom of one of the aeration pipes.

[0011] In some embodiments, the scraper is an elastic scraper, which is used to drive the sediment to gather on one side; a sewage discharge pipe is arranged on the scraper, and the sewage discharge pipe is used to suck and discharge the sediment on one side of the elastic scraper.

[0012] In some embodiments, a pressure sensor is arranged at the connection between the scraper and the aeration pipe, and the type of sediment on the magnetic settling plate is detected through the pressure sensor.

[0013] In some embodiments, the aeration assembly is supplied with gas by a Roots blower. The aeration pipe generates microbubbles to form a fluidized bed with the carrier, and the rotating ring drives the aeration pipeline to stir the water body, prolonging the residence time of the carrier in the sewage.

[0014] In some embodiments, the vertical pipe includes an upper pipe and a lower pipe connected by a corrugated pipe, and a limiting column, a spring and a hydraulic telescopic rod are arranged between the upper pipe and the lower pipe; when cleaning metal impurities, the hydraulic telescopic rod drives the scraper to disturb the water body up and down, so as to promote the dispersion of the high-density magnetic-responsive composite carrier into the water.

[0015] Compared with the prior art, the present invention provides a composite powder carrier process, which has the following beneficial effects.

[0016] 1. The present invention conducts dual recycling of the high-density magnetic-responsive composite carrier through the energized adsorption of the magnetic settling plate and the magnetic separator in the drainage pipeline, improving the retention rate of the high-density magnetic-responsive composite carrier inside the sewage treatment tank during sewage treatment, thereby increasing the utilization rate of the high-density magnetic-responsive composite carrier and reducing the operating cost.

[0017] 2. The present invention rotates the aeration pipeline to improve the uniformity of the distribution of bubbles in the tank, extend the contact time between the carrier and the pollutants, and stir and disturb the sewage and the high-density magnetic-responsive composite carrier when the aeration pipeline rotates, so as to accelerate the adsorption efficiency of the high-density magnetic-responsive composite carrier to the pollutants and improve the overall effect of sewage treatment.

[0018] 3. The present invention utilizes the magnetic suction force generated by the magnetic settling plate to quickly pull the high-density magnetic-responsive composite carrier carrying pollutants to settle, thereby realizing the effective separation of pollutants and clean water, greatly shortening the treatment cycle. Through the retention effect of the magnetic settling plate on the carrier and the subsequent operation of supplementing the sewage to be treated, the recycling of the high-density magnetic-responsive composite carrier is realized, reducing the treatment cost and ensuring the stability of the treatment effect at the same time.

[0019] 4. The present invention realizes the cleaning of the silt layer on the magnetic settling plate by setting a scraper on the aeration pipeline and combining with the jacking action of the hydraulic jack, so as to restore the contact area between the carrier and the magnetic settling plate, reduce the magnetic shielding effect of the silt, and improve the subsequent treatment effect. For the metal impurities accumulated on the magnetic settling plate, by designing a scraper and a hydraulic telescopic rod that can move up and down, the effective removal of the metal impurities is realized.

[0020] Other advantages, objectives and features of the present invention will be described to some extent in the subsequent specification; and to some extent, based on the study of the following text, it will be obvious to those skilled in the art; or, it can be taught from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the sewage treatment tank of the present invention.

[0022] Figure 2 It is a schematic structural diagram of the magnetic settling plate of the present invention.

[0023] Figure 3 This is a schematic structural view of the rotating component of the present invention.

[0024] Figure 4 This is a schematic structural view of the interior of the support platform of the present invention.

[0025] Figure 5 For the present invention Figure 4 An enlarged schematic structural view of area A in the figure.

[0026] Figure 6 This is a schematic structural view of the aeration pipeline of the present invention.

[0027] Figure 7 This is a schematic structural view of the water inlet pipe and the drain joint of the present invention.

[0028] Figure 8 This is a schematic structural view of the steel grid frame and the support platform of the present invention.

[0029] Figure 9 This is a schematic structural view of the vertical pipe of the present invention.

[0030] Figure 10 For the present invention Figure 9 An enlarged schematic structural view of area B in the figure.

[0031] Figure 11 This is a schematic structural view of the hydraulic telescopic rod of the present invention.

[0032] In the figure: 1, sewage treatment tank; 101, walkway; 102, staircase; 103, water inlet pipe; 2, support platform; 201, steel grid frame; 3, rotating component; 301, slotted opening; 302, drive motor; 303, transmission belt; 304, passive gear; 305, limiting ring groove; 306, rotating ring; 307, internal rack; 4, aeration component; 401, aeration pipeline; 4011, scraper; 4012, vertical pipe; 4013, aeration pipe; 4014, aeration hole; 4015, upper pipeline; 4016, lower pipeline; 402, branch pipe; 403, main pipe; 404, inlet pipe; 5, magnetic settling plate; 501, outer elastic pad; 502, inner elastic pad; 503, hydraulic jack; 6, drain joint; 601, drain pipe; 701, corrugated pipe; 702, fixing plate; 703, first support plate; 704, second support plate; 705, limiting post; 706, spring; 707, hydraulic telescopic rod. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0034] Reference Figure 1-11 , a composite powder carrier process, where the composite powder carrier is used for sewage treatment, including the following steps: S1. The sewage to be treated is introduced into sewage treatment tank 1, and the flow rate is controlled by a flow control valve. Meanwhile, a turbidity sensor is started to monitor in real time, providing data support for the dosage of the subsequent composite powder carrier; S2. When the turbidity of the sewage in sewage treatment tank 1 reaches the standard, the PLC controls the metering pump to dynamically add the composite powder carrier according to the sewage volume and the sewage turbidity value in sewage treatment tank 1. The composite powder carrier is a high-density magnetic-responsive composite carrier, and the high-density magnetic-responsive composite carrier is mixed with the sewage through the air supply pipeline 401 to adsorb and treat the pollutants in the sewage; S3. After the high-density magnetic-responsive composite carrier completes the adsorption in sewage treatment tank 1, the aeration and rotation are stopped. The magnetic settling plate 5 at the bottom of sewage treatment tank 1 is electrified to generate a magnetic suction force, pulling the high-density magnetic-responsive composite carrier to quickly settle with the pollutants, separating the pollutants from the clear water. The clear water is discharged through the drainage joint 6, and the high-density magnetic-responsive composite carrier remains at the bottom of sewage treatment tank 1; S4. The magnetic settling plate 5 is powered off, and the sewage to be treated is replenished again. The high-density magnetic-responsive composite carrier remaining in sewage treatment tank 1 continues to adsorb and treat the replenished sewage.

[0035] The raw materials of the high-density magnetic-responsive composite carrier include magnetic minerals, modified powdered activated carbon, and wear-resistant and corrosion-resistant additives, and the mass ratio of the three is 1:(12 - 18):(0.8 - 1.5); when the total mass is 100%: magnetic minerals are 5.3 - 6.7%, taking 1 part, modified activated carbon is 80 - 90%, taking 12 - 18 parts, and additives are 5 - 8%, taking 0.8 - 1.5 parts.

[0036] The magnetic mineral is Fe3O4 with a particle size of 50 - 100 nm. Fe3O4 is submicron-sized, dispersed and stable under the assistance of a magnetic field, has a larger specific surface area than the micron-sized one, higher adsorption efficiency, fast magnetic response speed. The magnetic response time of 50 - 100 nm Fe3O4 ≤ 10 s, and the adsorption capacity for COD reaches 350 mg / g.

[0037] The modified powdered activated carbon is obtained by subjecting powdered activated carbon to acid modification and then alkali modification in sequence. The wear-resistant and corrosion-resistant auxiliary agent is Al2O3 or TiO2 with a particle size of 20 - 40 nm. Al2O3 or TiO2 is nanoscale. After coating the core of Fe3O4, it has stronger compactness and a porosity ≤ 5%, so as to form a continuous protective layer for the Fe3O4 core, improving the corrosion resistance. When the pH = 2, the weight loss rate ≤ 5% / year. After the core of Fe3O4 is coated with Al2O3 or TiO2, the hardness and wear resistance are improved, and the annual loss rate is reduced by ≤ 5%. Among them, 20 - 40 nm Al2O3 can form a defect-free coating layer on the surface of Fe3O3 through chemical vapor deposition.

[0038] The preparation method of the modified powdered activated carbon includes the following steps: Mix the powdered activated carbon and nitric acid solution, oscillate at a constant temperature, filter, wash the precipitate until it is neutral, and dry it to obtain acid-modified powdered activated carbon; Mix the acid-modified powdered activated carbon and ammonia water solution, oscillate at a constant temperature, filter, wash the precipitate until it is neutral, with a pH = 6.5 - 7.5, and dry it in a vacuum oven to obtain the secondarily modified powdered activated carbon.

[0039] Among them, the concentration of the nitric acid solution is 2.4 - 3.0 mol / L; the mass ratio of the powdered activated carbon to the nitric acid solution is 1:4 - 1:6; The concentration of the ammonia water solution is 2.5 - 3.0 mol / L; the mass ratio of the acid-modified powdered activated carbon to the ammonia water solution is 1:5 - 1:7; The conditions for oscillating at a constant temperature are: oscillate for 10 - 12 h at 23 ± 2 °C; the conditions for drying are: dry in a vacuum oven at 105 - 110 °C for 22 - 24 h.

[0040] The composite powder carrier is prepared by the following method: Add magnetic minerals, modified powdered activated carbon, and wear-resistant and corrosion-resistant auxiliary agents in proportion to a high-speed mixer, and adopt a gradient stirring process: first stir at 60 - 80 r / min for 20 - 30 min, and then disperse at a high speed of 100 - 150 r / min for 10 - 15 min, so that the wear-resistant and corrosion-resistant auxiliary agent is evenly coated on the surfaces of the magnetic minerals and the modified powdered activated carbon, and the coefficient of variation of the coating layer thickness ≤ 10%. Preferably, the high-speed mixer is equipped with a magnetic field dispersion device, and an alternating rotating magnetic field of 500 - 800 mT and a frequency of 50 - 60 Hz is applied during the stirring process to promote the oriented arrangement of the magnetic minerals, obtaining a high-density magnetic-responsive composite carrier. Carrier magnetic properties: specific magnetization coefficient ≥ 45 emu / g. Wear resistance: annual loss rate ≤ 5%.

[0041] There is a walkway 101 at the top of the sewage treatment tank 1. There is a staircase 102 on one side of the walkway 101. One end of the staircase 102 away from the walkway 101 extends towards the ground. There is a support platform 2 in the middle of the sewage treatment tank 1, and a steel grid 201 is arranged on the top of the support platform 2.

[0042] The support platform 2 is provided with a rotating assembly 3 and an aeration assembly 4, and the rotating assembly 3 is used to drive the aeration assembly 4 to rotate.

[0043] Specifically, as an implementation manner of the rotating assembly 3, the rotating assembly 3 includes a slotted groove 301 opened inside the support platform 2. A driving motor 302 is arranged inside the slotted groove 301. The rotating end of the driving motor 302 is connected with a passive gear 304 through a transmission belt 303. A limiting ring groove 305 is opened at the edge of the slotted groove 301. A rotating ring 306 is movably connected inside the limiting ring groove 305. An internal rack 307 corresponding to and meshing with the passive gear 304 is arranged on the inner side of the rotating ring 306. After the driving motor 302 is started, the driving gear at the rotating end of the driving motor 302 drives the passive gear 304 to rotate through the transmission belt 303. The passive gear 304 drives the rotating ring 306 to rotate around the center point of the support platform 2 through the internal rack 307. The aeration assembly 4 rotates synchronously with the rotating ring 306. The inner side of the transmission belt 303 is provided with internal teeth, and both the driving gear and the passive gear 304 are meshed with the transmission belt 303. The transmission ratio of the driving gear driving the passive gear 304 through the transmission belt 303 is 1:3.

[0044] Specifically, as an implementation manner of the aeration assembly 4, the aeration assembly 4 includes an aeration pipeline 401. The top of the aeration pipeline 401 is fixedly connected with the outer side of the rotating ring 306. A branch pipe 402 is arranged at the top of the aeration pipeline 401. A main pipe 403 is arranged at the top of the branch pipe 402. An air inlet pipe 404 is arranged at the top of the main pipe 403.

[0045] There are multiple aeration pipelines 401, specifically six can be set. The included angles between adjacent two aeration pipelines 401 are equal, all being 60°. The multiple aeration pipelines 401 cover the whole pool in an equiangular manner. The aeration pipeline 401 rotates synchronously with the rotating ring 306, and the rotating ring 306 and the aeration pipeline 401 rotate at a constant speed of 0.5 - 2 r / min.

[0046] The high-density magnetic-responsive composite carrier is added to the sewage treatment pool 1 through a metering pump.

[0047] The aeration pipeline 401 includes a vertical pipe 4012 and an aeration pipe 4013. The vertical pipe 4012 is perpendicular to the aeration pipe 4013. Aeration holes 4014 are opened on the aeration pipe 4013.

[0048] A magnetic settling plate 5 is arranged at the bottom of the sewage treatment pool 1. An outer elastic pad 501 is arranged outside the magnetic settling plate 5. The magnetic settling plate 5 is fixedly connected with the inner side of the sewage treatment pool 1 through the outer elastic pad 501. A perforation with a diameter larger than that of the support platform 2 is opened in the middle of the magnetic settling plate 5. An inner elastic pad 502 is arranged inside the perforation. The perforation is fixedly connected with the support platform 2 through the inner elastic pad 502.

[0049] A hydraulic jack 503 is provided at the bottom of the magnetic settling plate 5. The fixed end of the hydraulic jack 503 is provided at the bottom of the sewage treatment tank 1, and the telescopic end of the hydraulic jack 503 is fixedly connected to the lower surface of the magnetic settling plate 5.

[0050] In the present invention, the sewage treatment tank 1 receives sewage through the water inlet pipe 103. A flow control valve is provided on the water inlet pipe 103. The flow control valve controls the sewage flow according to the volume of the sewage treatment tank 1. A turbidity sensor is provided inside the sewage treatment tank 1. Based on the detection result of the turbidity sensor for the sewage in the sewage treatment tank 1, when the turbidity of the sewage in the sewage treatment tank 1 reaches the preset value of the turbidity sensor, it indicates that the sewage in the sewage treatment tank 1 reaches high turbidity at this time.

[0051] A high-density magnetic-responsive composite carrier matching the turbidity and sewage volume is added into the sewage treatment tank 1. The high-density magnetic-responsive composite carrier is added into the sewage treatment tank 1 through a metering pump. The metering pump is automatically controlled by a PLC. After the turbidity sensor feeds back a high turbidity detection signal, the metering pump is automatically controlled to add the high-density magnetic-responsive composite carrier into the sewage treatment tank 1 at 80 - 150 mg / L.

[0052] During the sewage treatment process, a Roots blower is used as the power source. The Roots blower is equipped with a frequency converter. Gas generates microbubbles through the aeration pipe 4013. The microbubbles and the carrier form a fluidized bed. The surface of the microbubbles is loaded with carrier particles. The aeration flow continuously drives the carrier to circulate, so that the microbubbles are distributed throughout the sewage treatment tank 1, and the carrier particles continuously contact and adsorb the pollutants.

[0053] During this process, the driving motor 302 in the rotating assembly 3 is started. The driving motor 302 drives the driven gear 304 to rotate through the driving gear and the transmission belt 303. Under the meshing cooperation between the driven gear 304 and the rotating ring 306, and the limiting effect of the limiting ring groove 305 on the rotating ring 306, the rotating ring 306 is driven by the driven gear 304 to rotate around the center point of the support platform 2. The aeration pipeline 401 rotates synchronously with the rotating ring 306 to improve the uniformity of the distribution of the bubbles generated by aeration in the sewage treatment tank 1. The high-density magnetic-responsive composite carrier is adsorbed on the surface of the bubbles after aeration. At the same time, through the outward impact force of the gas in the aeration pipe 4013 and the rotation effect of the driving motor 302 driving the aeration pipeline 401 through the rotating ring 306, the aeration pipeline 401 stirs and disturbs the lower water body of the sewage treatment tank 1 and the bubbles carrying the high-density magnetic-responsive composite carrier during the rotation process, so that the bubbles carrying the high-density magnetic-responsive composite carrier are more evenly distributed in the sewage treatment tank 1. Through the upward buoyancy effect of the bubbles and the rotation effect of the driving motor 302 driving the aeration pipeline 401, the high-density magnetic-responsive composite carrier stays in different levels inside the sewage for a longer time, thereby improving the adsorption efficiency of the pollutants.

[0054] After the mixing and adsorption time of the high-density magnetic-responsive composite carrier in the sewage treatment tank 1 reaches the preset time, a large amount of pollutants are adsorbed on the surface of the high-density magnetic-responsive composite carrier. The driving motor 302 and the aeration pipeline 401 stop operating. By energizing the magnetic settling plate 5, the magnetic settling plate 5 generates a magnetic force. At this time, in addition to settling due to the influence of natural gravity, the magnetic force of the magnetic settling plate 5 generates a magnetic suction force on the high-density magnetic-responsive composite carrier for the suspended matter in the sewage treatment tank 1, pulling the high-density magnetic-responsive composite carrier carrying pollutants to move towards the bottom of the sewage treatment tank 1, accelerating the settling speed of the suspended matter in the sewage treatment tank 1 and the separation speed of the suspended matter from the clear water. The clear water after the separation of the suspended matter is located at the top of the sewage treatment tank 1. By opening the valve on the drainage joint 6, the filtered clear water is introduced into the next treatment device through the drainage joint 6 and the drainage pipe 601. During this process, the pollutants and the high-density magnetic-responsive composite carrier are close to the top of the magnetic settling plate 5. During the outward discharge of the clear water, the magnetic suction force of the magnetic settling plate 5 on the high-density magnetic-responsive composite carrier prevents the water flow from carrying the high-density magnetic-responsive composite carrier outwards, thereby increasing the retention rate of the high-density magnetic-responsive composite carrier in the sewage treatment tank 1 and reducing the sewage treatment cost.

[0055] After a batch of clear water is drained, the magnetic settling plate 5 is de-energized, and the sewage to be treated is replenished into the sewage treatment tank 1 through the water inlet pipe 103 again. The driving motor 302 and the aeration pipeline 401 are energized and operate. The driving motor 302 continues to drive the aeration pipeline 401 to rotate around the support platform 2 as the center point. At the same time, the bubbles generated by the aeration of the aeration pipeline 401 impact and adsorb the high-density magnetic-responsive composite carrier located at the bottom of the sewage treatment tank 1. Then, with the stirring and disturbance of the high-density magnetic-responsive composite carrier and the water body during the rotation of the aeration pipeline 401, the high-density magnetic-responsive composite carrier adsorbs and treats the pollutants in the next batch of sewage.

[0056] In actual use, with the treatment of multiple batches of sewage in the sewage treatment tank 1, sediment layers such as sludge and metal oxide precipitates will cover the upper surface of the magnetic settling plate 5, blocking the magnetic adsorption sites, reducing the contact area between the high-density magnetic-responsive composite carrier and the magnetic settling plate 5, and further resulting in the ineffective capture of the high-density magnetic-responsive composite carrier by the magnetic settling plate 5, leading to an increase in the loss rate of the high-density magnetic-responsive composite carrier with the water flow. To address this, the following improvements are made: A scraper 4011 is provided at the bottom of the aeration pipe 4013 of one of the aeration pipelines 401. In the initial state, there is a gap between the scraper 4011 and the upper surface of the magnetic settling plate 5.

[0057] After the mixed adsorption time of the high-density magnetic responsive composite carrier in the sewage treatment tank 1 reaches a preset time, the magnetic sedimentation plate 5 is energized to complete the separation of suspended matter and clean water. At this time, the water volume in the sewage treatment tank 1 is greatly reduced, and the telescopic end of the hydraulic jack 503 is lifted upward to push the magnetic sedimentation plate 5 upward by a preset distance, so that the upper surface of the magnetic sedimentation plate 5 is close to the lower surface of the scraper 4011. A pressure sensor is provided at the connection between the scraper 4011 and the aeration pipe 4013. A pressure threshold value P1 is preset in the pressure sensor. When the driving motor 302 drives the aeration pipe 401 to rotate through the active gear, the passive gear 304 and the rotating ring 306, the pressure sensor is set to the pressure threshold value P1. In the figure, the scraper 4011 rotates with the support platform 2 as the center, close to the magnetic sedimentation plate 5. During the rotation, the magnetic sedimentation plate 5 remains energized, and the scraper 4011 scrapes the upper half of the accumulation layer, wherein the lower half of the accumulation layer close to the magnetic sedimentation plate 5 is a strong adsorption area, and the upper half of the accumulation layer away from the magnetic sedimentation plate 5 is a weak adsorption area. Since the strong adsorption area has a stronger attraction for the high-density magnetic-responsive composite carrier, after the magnetic sedimentation plate 5 is energized, a large amount of high-density magnetic-responsive composite carriers accumulate in the lower half of the accumulation layer, so that when the scraper 4011 scrapes the upper half of the accumulation layer, the accumulation layer that does not contain the high-density magnetic-responsive composite carrier is driven to accumulate on one side of the scraper 4011.

[0058] The magnetic sedimentation plate 5 accumulates on one side of the scraper 4011. When the pressure sensor detects that the pressure threshold reaches P1, it actively determines that a lot of silt has accumulated on one side of the scraper 4011. At this time, the drive motor 302 continues to drive the aeration pipeline 401 to rotate one circle, so that the scraper 4011 can concentrate the silt on the magnetic sedimentation plate 5 on one side of the scraper 4011, so as to discharge the silt from the sewage treatment tank 1 to the outside.

[0059] Furthermore, a sewage pipe (not shown in the figure) is arranged on the aeration pipe 4013 corresponding to the scraper 4011. The sewage pipe is laid with the same length as the scraper 4011, and the sewage inlet of the sewage pipe is the same length as the scraper 4011 and is located above the scraper 4011. After the pressure sensor at the connection between the scraper 4011 and the aeration pipe 4013 detects that the pressure threshold reaches P1, the scraper 4011 rotates one circle, and then the control valve on the sewage pipe is started to attract the silt on one side of the scraper 4011 through the low pressure of the sewage pipe.

[0060] The scraping plate 4011 can be set as an elastic scraping plate. The elastic scraping plate includes a silicone rubber outer layer and a support skeleton disposed inside the silicone rubber outer layer. Based on this elastic scraping plate, when the elastic outer layer of the elastic scraping plate contacts the magnetic settling plate 5, the elastic outer layer can reduce the impact force on the high-density magnetic-responsive composite carrier. Under the magnetic attraction of the magnetic settling plate 5 on the high-density magnetic-responsive composite carrier, the high-density magnetic-responsive composite carrier remains in close contact with the magnetic settling plate 5, so that when the elastic scraping plate scrapes over the upper layer of the magnetic settling plate 5, it does not affect the high-density magnetic-responsive composite carrier. The elastic scraping plate scrapes over the upper half of the silt accumulation layer, and the silt accumulates on one side of the elastic scraping plate, and the accumulated matter is discharged outward at low pressure through the sewage discharge pipe.

[0061] In this way, the cleaning of the silt accumulation layer on the upper surface of the magnetic settling plate 5 is realized, and the contact area between the high-density magnetic-responsive composite carrier and the magnetic settling plate 5 is restored. After the silt accumulation layer is removed, the magnetic attraction between the high-density magnetic-responsive composite carrier and the magnetic settling plate 5 is restored, reducing the magnetic shielding effect of the silt accumulation layer. In the subsequent aeration mixing stage of sewage treatment, the high-density magnetic-responsive composite carrier will respond faster to the magnetic field of the magnetic settling plate 5, so as to shorten the separation time of clear water and suspended matter in the sewage treatment tank 1, and at the same time reduce the loss rate of the high-density magnetic-responsive composite carrier with the water flow.

[0062] A magnetic separator is embedded in the drain pipeline of the sewage treatment tank 1 for magnetically attracting and recovering the high-density magnetic-responsive composite carrier lost with the clear water.

[0063] In actual use, the operator found that due to the magnetic attraction of the magnetic settling plate 5 on the high-density magnetic-responsive composite carrier and metal impurities, some metal impurities cannot be discharged outward by the low-pressure attraction of the sewage discharge pipe. As the number of sewage treatment batches increases, more and more metal impurity mixtures will accumulate on the magnetic settling plate 5, and the metal impurity mixtures are difficult to effectively remove. The metal impurities adhere to the upper surface of the magnetic settling plate 5, resulting in the attenuation of the magnetic field strength of the magnetic settling plate 5 and the reduction of the effective adsorption area, thereby affecting the sewage treatment capacity of the sewage treatment tank 1 and the compliance of the effluent water quality. In response to this, the following embodiments are proposed to solve the above problems: The vertical pipe 4012 includes an upper pipe 4015 and a lower pipe 4016. A corrugated pipe 701 is provided between the upper pipe 4015 and the lower pipe 4016. A fixing plate 702 is provided at the top of the lower pipe 4016. A first support plate 703 and a second support plate 704 are provided at one end of the upper pipe 4015 close to the corrugated pipe 701. A limiting column 705 is provided at the top of the fixing plate 702, and the top of the limiting column 705 penetrates through the first support plate 703 and the second support plate 704. A spring 706 is provided between the first support plate 703 and the second support plate 704. The bottom end of the spring 706 is fixedly connected to the limiting column 705, and the top end of the spring 706 is fixedly connected to the lower surface of the second support plate 704.

[0064] The corrugated pipe 701 is preferably a stainless steel corrugated pipe. An electromagnetic bolt is provided in the opening of the first support plate 703. The electromagnetic bolt is used to lock the limit post 705. After the limit post 705 is locked, the aeration of the aeration pipe 4013 will not affect the stainless steel corrugated pipe.

[0065] During use, after the separated clear water in the sewage treatment tank 1 is discharged outward through the drain joint 6, the water body in the sewage treatment tank 1 is greatly reduced. The hydraulic jack 503 is activated and drives the magnetic settling plate 5 to move upward by a preset distance. After the upper surface of the magnetic settling plate 5 approaches the bottom end of the scraper 4011 and then moves upward a further distance, under the limiting effect of the opening on the first support plate 703 on the limit post 705, the lower pipe 4016 moves vertically upward, the corrugated pipe 701 contracts, and the spring 706 is compressed. The bottom of the scraper 4011 is in close contact with the upper surface of the magnetic settling plate 5. Then, the magnetic settling plate 5 is electrified to generate magnetism, and the metal impurities adhere to the upper surface of the magnetic settling plate 5. Then, the drive motor 302 is activated. The drive motor 302 drives the rotating ring 306, the upper pipe 4015, and the lower pipe 4016 to rotate synchronously through the driving gear, the transmission belt 303, and the driven gear 304. Among them, the upper pipe 4015 and the lower pipe 4016 maintain a vertically stable correspondence through the limiting effect of the opening on the first support plate 703 on the limit post 705.

[0066] The bottom of the scraper 4011 tightly abuts against the upper surface of the magnetic settling plate 5 and rotates driven by the drive motor 302. The scraper 4011 scrapes the metal impurities on the magnetic settling plate 5, and the metal impurities accumulate on one side of the scraper 4011 during the rotation of the scraper 4011. Driven by the drive motor 302, the scraper 4011 scrapes the metal impurities on the upper surface of the magnetic settling plate 5 for one week to complete the aggregation of the metal impurities, so as to facilitate the collection and treatment of the metal impurities along the scraper 4011.

[0067] To avoid the high-density magnetic-responsive composite carriers and metal impurities from aggregating on one side of the scraper 4011, resulting in a large amount of high-density magnetic-responsive composite carriers being discharged together with the metal impurities during the recovery of metal impurities, a hydraulic telescopic rod 707 is provided at the top of the second support plate 704 corresponding to the scraper 4011. The fixed end of the hydraulic telescopic rod 707 is fixedly connected to the second support plate 704, and the telescopic end of the hydraulic telescopic rod 707 is fixedly connected to the top end of the limit post 705. During the rotation of the scraper 4011, the telescopic end of the hydraulic telescopic rod 707 drives the limit post 705 and the fixing plate 702 to telescopically move a short distance. Under the connection action of the limit post 705 and the fixing plate 702, the corrugated pipe 701 and the spring 706 are repeatedly compressed and extended. The scraper 4011 moves up and down quickly for a short distance driven by the hydraulic telescopic rod 707. The scraper 4011 is obliquely arranged. Through the up and down movement of the scraper 4011 in the rotating state, the larger metal impurities on one side of the lower scraper 4011 are retained, and the high-density magnetic-responsive composite carriers with smaller particle sizes are continuously dispersed into the water under the action of water flow disturbance, so as to reduce the accumulation of high-density magnetic-responsive composite carriers on one side of the scraper 4011, and further avoid a large amount of high-density magnetic-responsive composite carriers from aggregating on one side of the scraper 4011 and being discharged together with the metal impurities. The height of the corrugated pipe 701 is always higher than the sewage surface of the sewage treatment tank 1.

[0068] It should be added that: a pressure threshold P2 is preset in the pressure sensor. After the clear water is discharged through the drain joint 6, the hydraulic telescopic rod 707 can be extended, or the magnetic settling plate 5 can be lifted by the hydraulic jack 503 to make the bottom end of the scraper 4011 close to the upper surface of the magnetic settling plate 5. The magnetic settling plate 5 remains energized. At this time, the drive motor 302 drives the scraper 4011 to rotate. The frictional force between the metal impurities and the magnetic settling plate 5 due to gravity is greater than the frictional force between the high-density magnetic-responsive composite carriers and the magnetic settling plate 5. During the rotation of the scraper 4011 around the support table 2, if the pressure sensor detects that the pressure threshold reaches P2, it indicates that too many metal impurities have accumulated and need to be cleaned. If the pressure value continuously detected by the pressure sensor remains at P1, it indicates that there is too much silt accumulation. According to the above detection results of the pressure sensor, corresponding treatment is carried out.

[0069] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent replacements or changes, and should be covered by the protection scope of the present invention.

[0070] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

Claims

1. A composite powder carrier process, the composite powder carrier being used for sewage treatment, characterized in that, It includes the following steps: S1. The sewage to be treated is introduced into the sewage treatment tank (1), and the flow rate is controlled by a flow control valve. Meanwhile, a turbidity sensor is started to monitor in real time, providing data support for the dosage of the composite powder carrier to be added subsequently. S2. When the turbidity of the sewage in the sewage treatment tank (1) reaches the standard, the PLC controls the metering pump to dynamically add the composite powder carrier according to the sewage volume and the sewage turbidity value in the sewage treatment tank (1). The composite powder carrier is a high-density magnetic-responsive composite carrier. The high-density magnetic-responsive composite carrier is mixed with the sewage through the air supply pipeline (401) to adsorb the pollutants in the sewage. S3. After the high-density magnetic-responsive composite carrier has completed the adsorption in the sewage treatment tank (1), the aeration and rotation are stopped. The magnetic settling plate (5) at the bottom of the sewage treatment tank (1) is electrified to generate a magnetic suction force, which pulls the high-density magnetic-responsive composite carrier to quickly settle with the pollutants, separating the pollutants from the clear water. The clear water is discharged through the drainage joint (6), and the high-density magnetic-responsive composite carrier remains at the bottom of the sewage treatment tank (1). S4. The magnetic settling plate (5) is powered off, and the sewage to be treated is replenished again. The high-density magnetic-responsive composite carrier remaining in the sewage treatment tank (1) continues to adsorb the replenished sewage.

2. The composite powder carrier process according to claim 1, characterized in that, The raw material composition and ratio of the high-density magnetic-responsive composite carrier are as follows: magnetic mineral: Fe3O4 with a particle size of 50 - 100 nm; modified powdered activated carbon; wear-resistant and corrosion-resistant additive: Al2O3 with a particle size of 20 - 40 nm, and the mass ratio of the three components is 1:12 - 18:0.8 - 1.

5.

3. The composite powder carrier process according to claim 2, characterized in that, The preparation of the modified powdered activated carbon includes: acid modification: the powdered activated carbon and nitric acid are mixed at a solid-liquid ratio of 1:4 - 1:6, oscillated at 23 ± 2 °C for 10 - 12 h, and washed to neutral, where the concentration of nitric acid is 2.4 - 3.0 mol / L; alkali modification: the acid-modified product and ammonia water are mixed at a solid-liquid ratio of 1:5 - 1:7, and the oscillation and washing process are repeated, where the concentration of ammonia water is 2.5 - 3.0 mol / L; Dried in a vacuum oven at 105 - 110 °C for 22 - 24 h.

4. A composite powder carrier process according to claim 1, wherein The sewage treatment tank (1) includes a support platform (2), and a rotation assembly (3) and an aeration assembly (4) are integrated on the support platform (2). The aeration assembly (4) is driven by the rotation assembly (3) to rotate, expanding the coverage range of the aeration assembly (4). The aeration assembly (4) includes a plurality of air supply pipelines (401).

5. A composite powder carrier process according to claim 4, wherein, The magnetic settling plate (5) is arranged at the bottom of the sewage treatment tank (1). A hydraulic jack (503) is arranged at the bottom of the magnetic settling plate (5). The hydraulic jack (503) is used to drive the magnetic settling plate (5) to move up and down, controlling the distance between the magnetic settling plate (5) and the air supply pipeline (401). The high-density magnetic-responsive composite carrier quickly settles with the suspended matter through the magnetic field of the magnetic settling plate (5); the magnetic settling plate (5) fixes the carrier through magnetic suction.

6. The composite powder carrier process according to claim 4, characterized in that, The air supply pipeline (401) includes a vertical pipe (4012) and an air supply pipe (4013). A plurality of air supply pipelines (401) are provided, and a scraper (4011) is arranged at the bottom of one of the air supply pipes (4013).

7. A composite powder carrier process according to claim 6, wherein, The scraper (4011) is an elastic scraper, and the elastic scraper is used to drive the silt to gather on one side; a sewage discharge pipe is provided on the scraper (4011), and the sewage discharge pipe is used to suck and discharge the silt on one side of the elastic scraper.

8. A composite powder carrier process according to claim 6, wherein, A pressure sensor is provided at the connection between the scraper (4011) and the aeration pipe (4013), and the type of silt on the magnetic settling plate (5) is detected through the pressure sensor.

9. A composite powder carrier process according to claim 4, wherein The aeration assembly (4) is supplied with gas by a Roots blower. The aeration pipe (4013) generates microbubbles to form a fluidized bed with the carrier. The rotating ring (306) drives the aeration pipeline (401) to stir the water body, prolonging the residence time of the carrier in the sewage.

10. A composite powder carrier process according to claim 6, characterized in that, The vertical pipe (4012) includes an upper pipe (4015) and a lower pipe (4016) connected by a corrugated pipe (701). A limit post (705), a spring (706) and a hydraulic telescopic rod (707) are provided between the upper pipe (4015) and the lower pipe (4016); when cleaning metal impurities, the hydraulic telescopic rod (707) drives the scraper (4011) to disturb the water body up and down, prompting the high-density magnetic-responsive composite carrier to disperse into the water.

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