A composite powder carrier process

Abstract

The application discloses a kind of composite powder carrier processes, belongs to sewage treatment technical field.A kind of composite powder carrier process, to be treated sewage is imported sewage treatment tank, adds high-density magnetic response composite carrier and adsorbs pollutant, and clean water is discharged after magnetic force settlement separation, and composite carrier remains continues to treat new sewage.The application magnetic force settlement plate power adsorption and drainage pipeline with magnetic separator to high-density magnetic response composite carrier double recovery, improve the retention rate of high-density magnetic response composite carrier in sewage treatment tank during sewage treatment, to improve the utilization rate of high-density magnetic response composite carrier.Using the magnetic attraction generated by magnetic force settlement plate, high-density magnetic response composite carrier is quickly pulled down with pollutants, and effective separation of pollutants and clean water is realized.The retention effect of magnetic force settlement plate on carrier, and subsequent operation of supplementing to be treated sewage, realizes the recycling of high-density magnetic response composite carrier, reduces the processing cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, and particularly relates to a composite powder carrier process. BACKGROUND

[0002] In the existing sewage treatment process, the composite powder carrier technology is widely concerned due to its high-efficiency pollutant adsorption capacity and recyclability. The existing magnetic composite powder carrier has a small particle size and a density close to water, and thus is prone to loss with the effluent in the sewage treatment process. In particular, in the drainage stage, the traditional magnetic separation device is difficult to completely intercept the carrier, resulting in a generally low carrier recovery rate, which not only increases the operation and maintenance cost, but also may cause secondary pollution to the environment after the unintercepted carrier is discharged.

[0003] In addition, a sludge layer is formed in the sewage treatment tank, the sludge layer contains sludge and metal impurities, and the sludge layer is mixed or covered with the carrier, thereby affecting the treatment of the carrier on the impurities in the sewage. SUMMARY

[0004] The present application aims to solve the problem of low interception and recovery rate of the carrier in the sewage treatment tank during sewage treatment in the prior art, and proposes a composite powder carrier process.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0006] The composite powder carrier process is used for sewage treatment, and is characterized by comprising the following steps:

[0007] S1, the sewage to be treated is introduced into a sewage treatment tank, the flow is controlled by a flow control valve, and a turbidity sensor is started synchronously to monitor in real time, so as to provide data support for the subsequent dosage of the composite powder carrier;

[0008] S2, when the turbidity of the sewage in the sewage treatment tank reaches the standard, a PLC control metering pump dynamically adds the composite powder carrier according to the sewage quantity and the sewage turbidity value in the sewage treatment tank, the composite powder carrier is a high-density magnetic response composite carrier, the high-density magnetic response composite carrier is mixed with the sewage through an aeration pipeline, and the pollutants in the sewage are adsorbed and treated;

[0009] S3, after the high-density magnetic response composite carrier completes the adsorption in the sewage treatment tank, the aeration is stopped, a magnetic sedimentation plate at the bottom of the sewage treatment tank is powered to generate a magnetic attraction force, the high-density magnetic response composite carrier is dragged to quickly settle with the pollutants, the pollutants are separated from the clean water, the clean water is discharged through a drainage joint, and the high-density magnetic response composite carrier is retained at the bottom of the sewage treatment tank;

[0010] S4, the magnetic force sedimentation plate is powered off, and the sewage to be treated is supplemented again, and the high-density magnetic response composite carrier remaining in the sewage treatment tank continues to adsorb the supplemented sewage.

[0011] In some embodiments, the raw material composition and ratio of the high-density magnetic response 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 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.

[0012] In some embodiments, the preparation of the modified powdered activated carbon comprises acid modification: powdered activated carbon is mixed with nitric acid at a solid-liquid ratio of 1:4-1:6, oscillated at 23±2℃ for 10-12h, and washed to neutral, wherein the concentration of the nitric acid is 2.4-3.0mol / L.

[0013] alkali modification: the acid modification product is mixed with ammonia water at a solid-liquid ratio of 1:5-1:7, and the oscillation and washing process is repeated, wherein the concentration of the ammonia water is 2.5-3.0mol / L.

[0014] 105-110℃ vacuum oven drying for 22-24h.

[0015] In some embodiments, the sewage treatment tank comprises a support table, a rotating assembly and an aeration assembly are integrated on the support table, the aeration assembly is driven to rotate by the rotating assembly, and the coverage of the aeration assembly is expanded, and the aeration assembly comprises a plurality of aeration pipelines.

[0016] In some embodiments, the magnetic force sedimentation plate is arranged at the bottom of the sewage treatment tank, a hydraulic jack is arranged at the bottom of the magnetic force sedimentation plate, the hydraulic jack is used to drive the magnetic force sedimentation plate to move up and down, the distance between the magnetic force sedimentation plate and the aeration pipeline is controlled, the high-density magnetic response composite carrier carries the suspended solids and quickly settles through the magnetic field of the magnetic force sedimentation plate, and the magnetic force sedimentation plate fixes the carrier through magnetic attraction.

[0017] In some embodiments, the aeration pipeline comprises a vertical pipe and an aeration pipe, and the aeration pipeline comprises a plurality of aeration pipes, and the bottom of one of the aeration pipes is provided with a scraper.

[0018] In some embodiments, the scraper is an elastic scraper, the elastic scraper is used to drive the accumulated sludge to gather on one side, and a sewage discharge pipeline is arranged on the scraper, and the sewage discharge pipeline is used to attract and discharge the accumulated sludge on one side of the elastic scraper.

[0019] In some embodiments, a pressure sensor is arranged at the connection between the scraper and the aeration pipe, and the type of the accumulated sludge on the magnetic force sedimentation plate is detected through the pressure sensor.

[0020] In some embodiments, the aeration assembly is supplied with air by a Roots blower, the aeration pipe generates micro-bubbles to form a fluidized bed with the carrier, and the rotating ring drives the aeration pipe to stir the water body, thereby prolonging the residence time of the carrier in the sewage.

[0021] In some embodiments, the vertical pipe comprises 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 metal impurities are cleaned, 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 response composite carrier in the water.

[0022] Compared with the prior art, the present application provides a composite powder carrier process, which has the following beneficial effects.

[0023] 1、The present application uses the magnetic attraction generated by the magnetic sedimentation plate to adsorb and remove the high-density magnetic response composite carrier in the magnetic separator of the drain pipe, thereby improving the retention rate of the high-density magnetic response composite carrier in the sewage treatment tank during sewage treatment, and improving the utilization rate of the high-density magnetic response composite carrier and reducing the operation cost.

[0024] 2、The present application rotates the aeration pipe to improve the uniformity of bubble distribution in the tank, prolongs the contact time of the carrier and pollutants, and stirs and disturbs the sewage and the high-density magnetic response composite carrier when the aeration pipe rotates, so as to accelerate the adsorption efficiency of the high-density magnetic response composite carrier on the pollutants and improve the overall effect of sewage treatment.

[0025] 3、The present application uses the magnetic attraction generated by the magnetic sedimentation plate to quickly pull the high-density magnetic response composite carrier carrying pollutants to settle, thereby realizing effective separation of the pollutants and clean water and greatly shortening the treatment cycle.

[0026] 4、The present application sets a scraper on the aeration pipe and combines the jacking action of the hydraulic jack to clean the accumulated layer on the magnetic sedimentation plate, thereby restoring the contact area of the carrier and the magnetic sedimentation plate, reducing the magnetic shielding effect of the accumulated material, and improving the subsequent treatment effect.

[0027] Other advantages, objects, and features of the present application will be set forth in part in the following specification taken in conjunction with the accompanying drawings; and in part will become apparent to those skilled in the art upon examination of the following specification and drawings; or can be learned from practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The sewage treatment tank structure of the present application is shown in the figure.

[0029] Figure 2 The structure of the magnetic sedimentation plate of the present application is shown in the figure.

[0030] Figure 3 The structure of the rotating assembly of the present application is shown in the figure.

[0031] Figure 4 The structure of the inside of the support platform of the present application is shown in the figure.

[0032] Figure 5 The structure of the A area of the present application is shown in the figure. Figure 4

[0033] Figure 6 The structure of the aeration pipeline of the present application is shown in the figure.

[0034] Figure 7 The structure of the water inlet pipe and the drainage joint of the present application is shown in the figure.

[0035] Figure 8 The structure of the steel net rack and the support platform of the present application is shown in the figure.

[0036] Figure 9 The structure of the vertical pipe of the present application is shown in the figure.

[0037] Figure 10 The structure of the B area of the present application is shown in the figure. Figure 9

[0038] Figure 11 The structure of the hydraulic telescopic rod of the present application is shown in the figure.

[0039] In the figure:

[0040] 1, sewage treatment tank; 101, walkway; 102, staircase; 103, water inlet pipe; 2, support platform; 201, steel net rack; 3, rotating assembly; 301, slot; 302, driving motor; 303, transmission belt; 304, driven gear; 305, limiting ring groove; 306, rotating ring; 307, internal gear rack; 4, aeration assembly; 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, air inlet pipe; 5, magnetic sedimentation plate; 501, outer elastic pad; 502, inner elastic pad; 503, hydraulic jack; 6, drainage joint; 601, drainage pipe; 701, corrugated pipe; 702, fixed plate; 703, first support plate; 704, second support plate; 705, limiting column; 706, spring; 707, hydraulic telescopic rod. DETAILED DESCRIPTION​​

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0042] Referring to Figures 1-11 A composite powder carrier process for sewage treatment, comprising the following steps:

[0043] S1, the sewage to be treated is introduced into a sewage treatment tank 1, the flow is controlled by a flow control valve, and a turbidity sensor is started synchronously to monitor in real time, so as to provide data support for the subsequent dosage of the composite powder carrier;

[0044] 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 quantity and the sewage turbidity value in the sewage treatment tank 1, the composite powder carrier is a high-density magnetic response composite carrier, the high-density magnetic response composite carrier is mixed with the sewage through an aeration pipeline 401, and the pollutants in the sewage are adsorbed and treated;

[0045] S3, after the high-density magnetic response composite carrier completes the adsorption in the sewage treatment tank 1, the aeration is stopped, the magnetic force settling plate 5 at the bottom of the sewage treatment tank 1 is electrified to generate a magnetic attraction force, the high-density magnetic response composite carrier carrying the pollutants is quickly settled, the pollutants are separated from the clean water, the clean water is discharged through a drain joint 6, and the high-density magnetic response composite carrier is retained at the bottom of the sewage treatment tank 1;

[0046] S4, the magnetic force settling plate 5 is de-energized, the sewage to be treated is again supplemented, and the high-density magnetic response composite carrier retained in the sewage treatment tank 1 continues to adsorb and treat the supplemented sewage.

[0047] The raw materials of the high-density magnetic response composite carrier include magnetic minerals, modified powder 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%, the magnetic minerals are 5.3-6.7%, 1 part is taken, the modified activated carbon is 80-90%, 12-18 parts are taken, and the additives are 5-8%, 0.8-1.5 parts are taken.

[0048] The magnetic minerals are Fe3O4 with a particle size of 50-100 nm, the Fe3O4 is submicron, is stably dispersed under the assistance of a magnetic field, has a larger specific surface area than micron, has a higher adsorption efficiency, has a fast magnetic response speed, and the magnetic response time of the 50-100 nm Fe3O4 is ≤10 s, and the COD adsorption capacity reaches 350 mg / g.

[0049] The modified powder activated carbon is obtained by sequentially acid modification and alkali modification of powder activated carbon, the wear-resistant and corrosion-resistant additive is Al2O3 or TiO2 with a particle size of 20-40 nm, the Al2O3 or TiO2 is in a nanoscale, and the core of Fe3O4 is coated to be more compact with a porosity of ≤5%, so as to form a continuous protective layer for the core of Fe3O4, improve the corrosion resistance, and reduce the weight loss rate to ≤5% per year at PH=2. After the core of Fe3O4 is coated by Al2O3 or TiO2, the hardness and wear resistance are improved, and the annual loss rate is reduced by ≤5%. The Al2O3 with a particle size of 20-40 nm can form a defect-free coating layer on the surface of Fe3O3 by gas phase deposition.

[0050] The preparation method of the modified powder activated carbon comprises the following steps:

[0051] The powder activated carbon and a nitric acid solution are mixed, constant temperature oscillation is performed, filtration is performed, the precipitate is washed to be neutral, and drying is performed to obtain acid modified powder activated carbon;

[0052] The acid modified powder activated carbon and an ammonia solution are mixed, constant temperature oscillation is performed, filtration is performed, the precipitate is washed to be neutral, PH=6.5-7.5, vacuum oven drying is performed, and the second modified powder activated carbon is obtained.

[0053] The concentration of the nitric acid solution is 2.4-3.0 mol / L; and the mass ratio of the powder activated carbon to the nitric acid solution is 1:4-1:6.

[0054] The concentration of the ammonia solution is 2.5-3.0 mol / L; and the mass ratio of the acid modified powder activated carbon to the ammonia solution is 1:5-1:7.

[0055] The constant temperature oscillation condition is oscillation at 23±2℃ for 10-12h; and the drying condition is vacuum oven drying at 105-110℃ for 22-24h.

[0056] The composite powder carrier is prepared by the following method: the magnetic mineral, the modified powder activated carbon and the wear-resistant and corrosion-resistant additive are added into a high-speed mixer in proportion, gradient stirring process is adopted: first stirring at 60-80r / min for 20-30min, and then high-speed dispersion at 100-150r / min for 10-15min, so that the wear-resistant and corrosion-resistant additive is uniformly coated on the surface of the magnetic mineral and the modified powder activated carbon, and the thickness variation coefficient of the coating layer is ≤10%. As an optimization, the high-speed mixer is provided with a magnetic field dispersion device, an alternating rotating magnetic field with a magnetic field intensity of 500-800mT and a frequency of 50-60Hz is applied during the stirring process, the magnetic mineral is arranged in a direction, and a high-density magnetic response composite carrier is obtained. The carrier has the following magnetic properties: specific magnetization coefficient ≥45emu / g. The wear resistance: annual loss rate ≤5%.

[0057] The top of the sewage treatment tank 1 is provided with a walkway 101, one side of the walkway 101 is provided with a staircase 102, the end of the staircase 102 away from the walkway 101 extends to the ground, the middle of the sewage treatment tank 1 is provided with a support platform 2, and the top of the support platform 2 is provided with a steel net rack 201.

[0058] 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.

[0059] Specifically, as one of the embodiments of the rotating assembly 3, the rotating assembly 3 comprises a slot 301 formed in the inside of the support platform 2, the inside of the slot 301 is provided with a driving motor 302, the rotating end of the driving motor 302 is connected with a driven gear 304 through a transmission belt 303, a limiting ring groove 305 is formed at the edge of the slot 301, and a rotating ring 306 is movably connected in the inside of the limiting ring groove 305. The inner side of the rotating ring 306 is provided with an internal gear rack 307 corresponding to the driven gear 304. After the driving motor 302 is started, the driving motor 302 drives the driven gear 304 to rotate through the transmission belt 303, and the driven gear 304 drives the rotating ring 306 to rotate with the center point of the support platform 2 as the center through the internal gear rack 307. The aeration assembly 4 rotates synchronously with the rotating ring 306. The inside of the transmission belt 303 is provided with internal teeth, and the driving gear and the driven gear 304 are engaged with the transmission belt 303. The transmission ratio of the driving gear driving the driven gear 304 through the transmission belt 303 is 1:3.

[0060] Specifically, as one of the embodiments of the aeration assembly 4, the aeration assembly 4 comprises an aeration pipeline 401, the top of the aeration pipeline 401 is fixedly connected with the outside of the rotating ring 306, the top of the aeration pipeline 401 is provided with a branch pipe 402, the top of the branch pipe 402 is provided with a main pipe 403, and the top of the main pipe 403 is provided with an air inlet pipe 404.

[0061] The aeration pipeline 401 is provided with a plurality of aeration pipelines 401, which can be six, the included angle between adjacent two aeration pipelines 401 is equal, which is 60°, and the plurality of aeration pipelines 401 covers the whole tank at equal angles. The aeration pipeline 401 rotates synchronously with the rotating ring 306, and the rotating ring 306 and the aeration pipeline 401 rotate at a uniform speed of 0.5-2r / min.

[0062] The high-density magnetic response composite carrier is added to the sewage treatment tank 1 through a metering pump.

[0063] The aeration pipeline 401 comprises a vertical pipe 4012 and an aeration pipe 4013, the vertical pipe 4012 and the aeration pipe 4013 are perpendicular to each other, and the aeration pipe 4013 is provided with an aeration hole 4014.

[0064] The sewage treatment tank 1 is provided with a magnetic sedimentation plate 5 at the bottom, and the outer side of the magnetic sedimentation plate 5 is provided with an outer elastic pad 501, the magnetic sedimentation plate 5 is fixedly connected with the inner side of the sewage treatment tank 1 through the outer elastic pad 501, and the middle part of the magnetic sedimentation plate 5 is provided with a perforation with a diameter larger than that of the support table 2, and the perforation is provided with an inner elastic pad 502, and the perforation is fixedly connected with the support table 2 through the inner elastic pad 502.

[0065] The bottom of the magnetic sedimentation plate 5 is provided with a hydraulic jack 503, the fixed end of the hydraulic jack 503 is arranged at the bottom of the sewage treatment tank 1, and the telescopic end of the hydraulic jack 503 is fixedly connected with the lower surface of the magnetic sedimentation plate 5.

[0066] In the present application, the sewage treatment tank 1 receives sewage through the water inlet pipe 103, the water inlet pipe 103 is provided with a flow control valve, the flow control valve controls the sewage flow according to the volume of the sewage treatment tank 1, the sewage treatment tank 1 is provided with a turbidity sensor, and based on the detection result of 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.

[0067] The high-density magnetic response composite carrier matching the turbidity and the sewage amount is added into the sewage treatment tank 1, the high-density magnetic response composite carrier is added into the sewage treatment tank 1 through the metering pump, the metering pump is automatically controlled through the PLC, and after the turbidity sensor feeds back the high-turbidity detection signal, the metering pump is automatically controlled to add the high-density magnetic response composite carrier into the sewage treatment tank 1 at 80-150 mg / L.

[0068] In the sewage treatment process, the Roots blower serves as a power source, the Roots blower is provided with a frequency converter, gas passes through the aeration pipe 4013 to generate micro-bubbles, the micro-bubbles form a fluidized bed with the carrier, the carrier particles are loaded on the surface of the micro-bubbles, the aeration flow continuously drives the carrier to circulate, so that the micro-bubbles complete the full-tank distribution in the sewage treatment tank 1, and the carrier particles and the pollutants continuously contact and adsorb.

[0069] In the 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, the driven gear 304 is engaged with the rotating ring 306, and the limiting ring groove 305 limits the rotating ring 306, the rotating ring 306 is driven by the driven gear 304 to rotate with the center point of the supporting table 2 as the center, 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 response composite carrier is adsorbed on the surface of the bubble after aeration, and the aeration pipeline 401 is stirred and disturbed to the water body below the sewage treatment tank 1 and the bubble carrying the high-density magnetic response composite carrier in the rotating process through the impact force of the gas in the aeration pipe 4013 and the rotating action of the driving motor 302 driving the aeration pipeline 401, so that the bubble carrying the high-density magnetic response composite carrier is more uniformly distributed in the sewage treatment tank 1, and the high-density magnetic response composite carrier stays in the sewage for a longer time through the buoyancy of the bubble and the rotating action of the driving motor 302 driving the aeration pipeline 401, thereby improving the adsorption efficiency of the pollutants.

[0070] When the high-density magnetic response composite carrier is mixed and adsorbed in the sewage treatment tank 1 for a predetermined time, the high-density magnetic response composite carrier surface adsorbs a large amount of pollutants, the driving motor 302 and the aeration pipeline 401 stop running, the magnetic force sedimentation plate 5 is powered on to generate a magnetic force, at this time, the suspended solids in the sewage treatment tank 1 are affected by the natural gravity and are also affected by the magnetic force of the magnetic force sedimentation plate 5, the high-density magnetic response composite carrier is attracted to the bottom of the sewage treatment tank 1, the settling speed of the suspended solids in the sewage treatment tank 1 is accelerated, the separation speed of the suspended solids and the clear water is accelerated, the clear water after the separation of the suspended solids is located at the top of the sewage treatment tank 1, the filtered clear water is introduced into the next treatment equipment through the drainage joint 6 and the drainage pipe 601 by opening the valve on the drainage joint 6, in the process, the pollutants and the high-density magnetic response composite carrier are close to the top of the magnetic force sedimentation plate 5, the magnetic attraction of the magnetic force sedimentation plate 5 to the high-density magnetic response composite carrier avoids the water flow carrying the high-density magnetic response composite carrier to the outside, thereby improving the retention rate of the high-density magnetic response composite carrier in the sewage treatment tank 1 and reducing the cost of sewage treatment.

[0071] After a batch of clean water is discharged, the magnetic sedimentation plate 5 is powered off, the sewage treatment tank 1 is filled with sewage to be treated again through the water inlet pipe 103, the driving motor 302 and the aeration pipe 401 are powered on and operated, the aeration pipe 401 is driven to rotate by the driving motor 302 with the support table 2 as the center, and the bubbles generated by the aeration of the aeration pipe 401 impact and adsorb the high-density magnetic response composite carrier located at the bottom of the sewage treatment tank 1. During the rotation of the aeration pipe 401, the high-density magnetic response composite carrier and the water body are stirred and disturbed, so that the high-density magnetic response composite carrier adsorbs and treats the pollutants in the next batch of sewage.

[0072] In actual use, as the sewage treatment tank 1 treats multiple batches of sewage, the accumulated layer such as sludge and metal oxide precipitate covers the upper surface of the magnetic sedimentation plate 5, shielding the magnetic adsorption points, reducing the contact area between the high-density magnetic response composite carrier and the magnetic sedimentation plate 5, and further causing the high-density magnetic response composite carrier to be unable to be effectively captured by the magnetic sedimentation plate 5, resulting in an increase in the loss rate of the high-density magnetic response composite carrier with the water flow. To this end, the following improvement is made: a scraper 4011 is arranged at the bottom of the aeration pipe 4013 of one of the aeration pipes 401, and in the initial state, the scraper 4011 has a gap with the upper surface of the magnetic sedimentation plate 5.

[0073] When the mixing and adsorption time of the high-density magnetic response composite carrier in the sewage treatment tank 1 reaches the preset time, the magnetic sedimentation plate 5 is powered on, and after the separation of suspended solids and clean water is completed, the water volume in the sewage treatment tank 1 is greatly reduced. The extension end of the hydraulic jack 503 is lifted upward to push the magnetic sedimentation plate 5 to move 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 arranged at the connection between the scraper 4011 and the aeration pipe 4013, and a pressure threshold P1 is preset in the pressure sensor. During the rotation of the aeration pipe 401 driven by the driving motor 302 through the driving gear, the driven gear 304 and the rotating ring 306, the scraper 4011 rotates close to the magnetic sedimentation plate 5 with the support table 2 as the center. During the rotation, the magnetic sedimentation plate 5 remains powered on, and the scraper 4011 scrapes the upper half of the accumulated layer. The lower half of the accumulated layer close to the magnetic sedimentation plate 5 is a strong adsorption area, and the upper half of the accumulated layer away from the magnetic sedimentation plate 5 is a weak adsorption area. Because the strong adsorption area has stronger attraction to the high-density magnetic response composite carrier, a large amount of high-density magnetic response composite carrier accumulates in the lower half of the accumulated layer after the magnetic sedimentation plate 5 is powered on. Therefore, when the scraper 4011 scrapes the upper half of the accumulated layer, the accumulated layer without high-density magnetic response composite carrier accumulates on one side of the scraper 4011.

[0074] The magnetic sedimentation plate 5 accumulates on one side of the scraper 4011. When the pressure sensor detects that the pressure threshold reaches PI, it is determined that the scraper 4011 side accumulates more silt, and at this time, the aeration pipe 401 is driven to rotate one revolution by the driving motor 302, so that the scraper 4011 concentrates 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.

[0075] Further, a sewage discharge pipeline (not shown in the figure) is arranged on the aeration pipe 4013 corresponding to the scraper 4011. The sewage discharge pipeline is laid in the same length as the scraper 4011, and the sewage inlet of the sewage discharge pipeline is above the scraper 4011. After the pressure sensor at the joint of the scraper 4011 and the aeration pipe 4013 detects that the pressure threshold reaches PI, the scraper 4011 rotates one revolution, and then the control valve on the sewage discharge pipeline is started. The silt on one side of the scraper 4011 is sucked by the low pressure of the sewage discharge pipeline.

[0076] The scraper 4011 can be an elastic scraper, which includes a silicon rubber outer layer and a support framework arranged inside the silicon rubber outer layer. Based on the elastic scraper, when the elastic outer layer of the elastic scraper contacts the magnetic sedimentation plate 5, the elastic outer layer can reduce the impact force on the high-density magnetic response composite carrier. Under the magnetic attraction of the magnetic sedimentation plate 5 to the high-density magnetic response composite carrier, the high-density magnetic response composite carrier is closely attached to the magnetic sedimentation plate 5, so that the elastic scraper does not affect the high-density magnetic response composite carrier when it scrapes the upper layer of the magnetic sedimentation plate 5. When the elastic scraper scrapes the upper half of the silt layer, the silt is accumulated on one side of the elastic scraper, and the accumulated material is discharged to the outside by the low pressure of the sewage discharge pipeline.

[0077] In this way, the upper silt layer of the magnetic sedimentation plate 5 is cleaned, the contact area of the high-density magnetic response composite carrier and the magnetic sedimentation plate 5 is restored, and the magnetic attraction between the high-density magnetic response composite carrier and the magnetic sedimentation plate 5 is restored after the silt layer is removed. The magnetic shielding effect of the silt layer is reduced. In the subsequent aeration mixing stage of sewage treatment, the high-density magnetic response composite carrier will respond faster to the magnetic field of the magnetic sedimentation plate 5, so as to shorten the separation time of clean water and suspended matter in the sewage treatment tank 1, and reduce the loss rate of the high-density magnetic response composite carrier with the water flow.

[0078] A magnetic separator is embeddedly installed on the drain pipeline of the sewage treatment tank 1, which is used for magnetic attraction and recovery of the high-density magnetic response composite carrier lost with the clean water.

[0079] In actual use, the operator finds that due to the magnetic attraction of the magnetic sedimentation plate 5 to the high-density magnetic response composite carrier and metal impurities, part of the metal impurities cannot be discharged outward by the low-pressure suction of the blowdown pipe. With the increase of the sewage treatment batch, more and more metal impurity mixtures will accumulate on the magnetic sedimentation plate 5, which is difficult to effectively remove. The metal impurities adhere to the upper surface of the magnetic sedimentation plate 5, causing the magnetic field strength of the magnetic sedimentation plate 5 to attenuate and the effective adsorption area to decrease, thereby affecting the treatment capacity of the sewage treatment tank 1 for sewage and affecting the water quality of the effluent to meet the standard. To solve the above problems, the following embodiments are proposed:

[0080] The vertical pipe 4012 comprises an upper pipe 4015 and a lower pipe 4016, a corrugated pipe 701 is arranged between the upper pipe 4015 and the lower pipe 4016, a fixed plate 702 is arranged at the top end of the lower pipe 4016, a first support plate 703 and a second support plate 704 are arranged at one end of the upper pipe 4015 close to the corrugated pipe 701, a limiting column 705 is arranged at the top of the fixed plate 702, the top of the limiting column 705 penetrates through the first support plate 703 and the second support plate 704, a spring 706 is arranged between the first support plate 703 and the second support plate 704, the bottom end of the spring 706 is fixedly connected with the limiting column 705, and the top end of the spring 706 is fixedly connected with the lower surface of the second support plate 704.

[0081] The corrugated pipe 701 is preferably a stainless steel corrugated pipe, an electromagnetic latch is arranged in the opening of the first support plate 703, and the electromagnetic latch is used for locking the limiting column 705. After the limiting column 705 is locked, the aeration pipe 4013 does not affect the stainless steel corrugated pipe during aeration.

[0082] In use, after the separated clean 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 started and drives the magnetic sedimentation plate 5 to move upward by a preset distance, the upper surface of the magnetic sedimentation plate 5 approaches the bottom end of the scraper 4011, and then moves upward by a distance, under the limiting action of the opening in the first support plate 703 on the limiting column 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 sedimentation plate 5, then the magnetic force is generated by electrifying the magnetic sedimentation plate 5, the metal impurities are tightly attached to the upper surface of the magnetic sedimentation plate 5, then the driving motor 302 is started, the driving 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, wherein the upper pipe 4015 and the lower pipe 4016 keep vertical and stable correspondence through the limiting action of the opening in the first support plate 703 on the limiting column 705.

[0083] The bottom of the scraper 4011 closely contacts the upper surface of the magnetic sedimentation plate 5, and rotates under the drive of the driving motor 302. The scraper 4011 scrapes the metal impurities on the magnetic sedimentation plate 5, and accumulates the metal impurities on one side of the scraper 4011 during the rotation of the scraper 4011. Under the drive of the driving motor 302, the scraper 4011 scrapes the metal impurities on the upper surface of the magnetic sedimentation plate 5 for one round, and completes the accumulation of the metal impurities, so as to facilitate the collection and treatment of the metal impurities along the scraper 4011.

[0084] In order to avoid the high-density magnetic response composite carrier being accumulated with the metal impurities on one side of the scraper 4011, resulting in a large amount of high-density magnetic response composite carrier being discharged together with the metal impurities during the recovery of the metal impurities, a hydraulic telescopic rod 707 is arranged on 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 with the second support plate 704, and the telescopic end of the hydraulic telescopic rod 707 is fixedly connected with the top end of the limiting column 705. During the rotation of the scraper 4011, the limiting column 705 and the fixed plate 702 are driven by the telescopic end of the hydraulic telescopic rod 707 to stretch and contract for a short distance. Under the connection of the limiting column 705 and the fixed plate 702, the bellows 701 and the spring 706 are repeatedly compressed and stretched. The scraper 4011 is driven by the hydraulic telescopic rod 707 to move up and down for a short distance at a high speed. The scraper 4011 is arranged obliquely. Through the up and down movement of the scraper 4011 in the rotating state, the larger metal impurities on one side of the scraper 4011 are reserved. The high-density magnetic response composite carrier with smaller particle size is continuously dispersed in the water under the action of water flow disturbance, so as to reduce the accumulation of the high-density magnetic response composite carrier on one side of the scraper 4011, and further avoid a large amount of high-density magnetic response composite carrier being discharged together with the metal impurities on one side of the scraper 4011. The height of the bellows 701 is always higher than the sewage surface of the sewage treatment tank 1.

[0085] It should be noted that: a pressure threshold P2 is preset in the pressure sensor. After the clean water is discharged through the drain joint 6, the hydraulic telescopic rod 707 can be extended, or the hydraulic jack 503 can be used to lift the magnetic sedimentation plate 5, so that the bottom end of the scraper 4011 is close to the upper surface of the magnetic sedimentation plate 5. The magnetic sedimentation plate 5 is kept powered on. At this time, the driving motor 302 drives the scraper 4011 to rotate. The friction between the metal impurities and the magnetic sedimentation plate 5 is greater than the friction between the high-density magnetic response composite carrier and the magnetic sedimentation plate 5. During the rotation of the scraper 4011 with the support table 2 as the center, if the pressure sensor detects that the pressure threshold reaches P2, it indicates that the metal impurities need to be cleaned because they are accumulated too much. If the pressure value detected by the pressure sensor continuously maintains P1, it indicates that the metal impurities are accumulated too much. According to the detection result of the pressure sensor, the corresponding treatment is carried out.

[0086] The above merely provides the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, according to the technical scheme and the inventive concept of the present application, can make equivalent replacements or changes within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

[0087] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without contradiction.

Claims

1. A composite powder carrier process, said composite powder carrier for sewage treatment, characterized in that, The method comprises the following steps: S1, the sewage to be treated is introduced into a sewage treatment tank (1), the flow is controlled by a flow control valve, and a turbidity sensor is started synchronously to monitor in real time, thereby providing data support for the subsequent adding amount of the composite powder carrier; S2, when the turbidity of the sewage in the sewage treatment tank (1) reaches the standard, a metering pump controlled by a PLC dynamically adds the composite powder carrier according to the amount of the sewage in the sewage treatment tank (1) and the turbidity value of the sewage, the composite powder carrier is a high-density magnetic response composite carrier, the high-density magnetic response composite carrier is mixed with the sewage through an aeration pipeline (401), and the pollutants in the sewage are adsorbed and treated; S3, after the high-density magnetic response composite carrier completes adsorption in the sewage treatment tank (1), aeration is stopped, a magnetic force sedimentation plate (5) at the bottom of the sewage treatment tank (1) is powered on to generate a magnetic attraction force, the high-density magnetic response composite carrier is dragged to rapidly settle down, the pollutants are separated from the clean water, the clean water is discharged through a drainage joint (6), and the high-density magnetic response composite carrier is retained at the bottom of the sewage treatment tank (1); S4, the magnetic force sedimentation plate (5) is powered off, the sewage to be treated is added again, and the high-density magnetic response composite carrier retained in the sewage treatment tank (1) continues to adsorb and treat the added sewage again; The sewage treatment tank (1) comprises a support table (2), the support table (2) is integrated with a rotating assembly (3) and an aeration assembly (4), the aeration assembly (4) is driven to rotate by the rotating assembly (3), and the coverage of the aeration assembly (4) is expanded, the aeration assembly (4) comprises a plurality of aeration pipelines (401); The magnetic force sedimentation 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 force sedimentation plate (5), the hydraulic jack (503) is used for driving the magnetic force sedimentation plate (5) to move up and down, the distance between the magnetic force sedimentation plate (5) and the aeration pipeline (401) is controlled, the high-density magnetic response composite carrier is rapidly settled down by the magnetic field of the magnetic force sedimentation plate (5), and the magnetic force sedimentation plate (5) fixes the carrier through magnetic attraction; The aeration pipeline (401) comprises a vertical pipe (4012) and an aeration pipe (4013), the aeration pipeline (401) is provided with a plurality of aeration pipelines, and the bottom of one aeration pipe (4013) is provided with a scraper (4011); The scraper (4011) is an elastic scraper, the elastic scraper is used for driving the accumulated silt to gather on one side, a sewage discharge pipeline is arranged on the scraper (4011), and the accumulated silt on one side of the elastic scraper is sucked and discharged through the sewage discharge pipeline; A pressure sensor is arranged at the connection position of the scraper (4011) and the aeration pipe (4013), and the type of the accumulated silt on the magnetic force sedimentation plate (5) is detected through the pressure sensor. The vertical pipe (4012) comprises an upper pipe (4015) and a lower pipe (4016) connected by a corrugated pipe (701), and a limiting column (705), a spring (706) and a hydraulic telescopic rod (707) are arranged between the upper pipe (4015) and the lower pipe (4016); when metal impurities are cleaned, the hydraulic telescopic rod (707) drives the scraper (4011) to disturb the water body up and down, so as to promote the dispersion of the high-density magnetic response composite carrier into the water.

2. The composite powder carrier process of claim 1, wherein, The raw material composition and ratio of the high-density magnetic response composite carrier are as follows: magnetic mineral: Fe3O4 with a particle size of 50-100 nm; modified powder 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.

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

4. The composite powder carrier process of claim 1, wherein, The aeration assembly (4) is supplied with air by a Roots blower, micro-bubbles are generated by the aeration pipe (4013) and the carrier forms a fluidized bed, the rotating ring (306) drives the aeration pipeline (401) to stir the water body, and the residence time of the carrier in the sewage is prolonged.

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