Magnetic coagulation and sedimentation integrated device carrying magnetic sedimentation technology

Abstract

The invention relates to a magnetic coagulation and sedimentation integrated device carrying a magnetic sedimentation technology. The magnetic coagulation and sedimentation integrated device comprises a water inlet reaction zone, an inclined tube sedimentation zone, a magnetic sedimentation zone, an oxidation zone and a magnetic recovery assembly, the water inlet reaction area comprises a water inlet reaction area first grid, a water inlet reaction area second grid, a water inlet reaction area third grid and a water inlet pipe; the inclined tube settling zone comprises an upper-layer long inclined tube, a lower-layer short inclined tube, a water outlet groove and a water inlet channel; the magnetic settling area comprises a traveling sludge discharging machine, an electromagnet and a mud baffle on the electromagnet; the oxidation zone comprises a first oxidation zone grid, a second oxidation zone grid, a third oxidation zone grid and a water outlet pipe; the magnetic recovery assembly comprises a magnetic separator, a high shearing machine, a sludge return pipe and a sludge discharge pipe. Compared with the prior art, the magnetic coagulation sedimentation, magnetic sedimentation, magnetic seed recovery and tail water oxidation technologies are integrated, the coagulation time is greatly shortened, and the starting time and the sedimentation time of the sedimentation device are shortened; the precipitation effect is improved; the sludge moisture content is reduced; the magnetic seed recovery rate is high.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and in particular to a magnetic coagulation and sedimentation integrated device equipped with magnetic sedimentation technology. Background Art

[0002] There are still a large number of combined sewer systems in many cities in my country. Due to the low interception multiple standard of the original design, overflows often occur on rainy days. At the same time, the diameter of the combined sewer pipes is large, the amount of sewage is small on sunny days, and the sediment in the sewage settles at the bottom of the pipe. On rainy days, the amount of water is large, and the pollutants deposited at the bottom of the pipe are washed up, making the overflow sewage discharge concentration high. At the same time, in the separate drainage system, due to inadequate construction and management, a large amount of sewage is mixed with the rainwater pipe, resulting in untreated sewage being directly discharged into the environment on rainy days. The rainy overflow pollution caused by the above situation is characterized by suddenness, large water volume, and high pollution load, which is an important cause of the repeated black and smelly urban water bodies.

[0003] The high-efficiency sedimentation tank technology is based on a variety of theories such as sewage coagulation, inclined tube separation, sludge return and concentration. By optimizing the sedimentation process and improving water flow conditions, it can complete the precipitation of impurities in sewage more quickly. It has the advantages of high treatment efficiency, good effluent quality, and small footprint. When overflow pollution occurs, the high-efficiency sedimentation tank can be put into use quickly to quickly achieve the pollution removal effect, thereby reducing its impact on the surrounding water and environment.

[0004] Magnetic coagulation technology is a new type of enhanced coagulation technology that increases the density of flocs, improves the sedimentation rate, and achieves rapid solid-liquid separation by adding magnetic seeds during the conventional coagulation process. High-efficiency sedimentation tanks equipped with magnetic coagulation technology are widely used in overflow pollution treatment and initial rainwater purification. However, at present, magnetic coagulation technology mainly removes suspended matter and colloids from pollutants in water, and has low efficiency in removing soluble pollutants. At the same time, the addition of magnetic seeds only increases the specific gravity of flocs without utilizing their magnetism, so the time required for sedimentation is still too long. For this reason, magnetic coagulation sedimentation technology urgently needs to move towards shorter hydraulic retention time, better treatment effect, and achieve integration and equipment. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide an integrated magnetic coagulation and sedimentation device equipped with magnetic sedimentation technology, which integrates magnetic coagulation and sedimentation, magnetic sedimentation, magnetic seed recovery, and tail water oxidation technology. Magnetic coagulation can greatly shorten the coagulation time, improve the particle density, and shorten the start-up time of the sedimentation device. Double-layer inclined tube sedimentation can further improve the sedimentation effect and reduce the sludge moisture content. The electromagnetic field generated by the electromagnet in the magnetic sedimentation zone of the device can accelerate the sedimentation of magnetic flocs, which shortens the sedimentation time by 20% compared with traditional magnetic coagulation. The magnetic seed recovery rate of the magnetic seed recovery equipment is over 99%, ensuring that the integrated magnetic coagulation and sedimentation device does not require the addition of magnetic seeds during long-term operation.

[0006] The present invention provides a magnetic coagulation and precipitation integrated device equipped with magnetic sedimentation technology, comprising: a water inlet reaction zone, an inclined tube sedimentation zone, a magnetic sedimentation zone, an oxidation zone, and a magnetic recovery component;

[0007] The water inlet reaction zone comprises: a first grid of the water inlet reaction zone, a second grid of the water inlet reaction zone, a third grid of the water inlet reaction zone, and a water inlet pipe. The first grid of the water inlet reaction zone, the second grid of the water inlet reaction zone, and the third grid of the water inlet reaction zone are all provided with a first agitator for adjusting the velocity gradient required for coagulation and flocculation reactions and preventing the magnetic seed from settling in the water inlet reaction zone. By adding a coagulant, a magnetic seed, and a flocculant to the sewage in the water inlet reaction zone, small-sized suspended solids in the sewage can be aggregated into magnetic flocs, thereby increasing the density and magnetism of the flocs.

[0008] The inclined tube sedimentation area is located in the middle of the device, and the magnetic flocs and pollutants are settled in the inclined tube sedimentation area, including: an upper long inclined tube, a lower short inclined tube, a water outlet trough, and an inlet channel. The lower short inclined tube plays a rectifying role and preliminarily intercepts large particles of magnetic flocs to enhance the sludge concentration effect of the bottom sludge area; the upper long inclined tube further settles fine particle pollutants;

[0009] The magnetic sedimentation area is located below the inclined tube sedimentation area, and includes: a driving mud discharger, an electromagnet, and a mud guard on the electromagnet. The sludge from the inclined tube sedimentation area is settled to the magnetic sedimentation area. The electromagnet is energized to generate an electromagnetic field to accelerate the sedimentation of magnetic flocs.

[0010] The oxidation zone is located at the end of the device, and includes: a first cell of the oxidation zone, a second cell of the oxidation zone, a third cell of the oxidation zone, and a water outlet pipe. The first cell of the oxidation zone is provided with a second agitator for mixing sewage and oxidant. The dissolved pollutants in the water are further removed by adding oxidant to the first cell of the oxidation zone.

[0011] The magnetic recovery component is located above the water inlet reaction zone. The magnetic recovery component is connected to the traveling sludge discharger through a sludge conveying rubber hose. The magnetic recovery component includes: a magnetic separator, a high shear machine, a sludge return pipe and a sludge discharge pipe. The magnetic seeds and flocs in the magnetic flocs can be separated. The magnetic seed recovery rate is more than 99%. The recovered magnetic seeds are returned to the first grid of the water inlet reaction zone through the sludge return pipe, and the remaining sludge is discharged through the sludge discharge pipe.

[0012] Furthermore, the traveling mud discharger comprises: a driving assembly, a mud scraper, a mud pumping and suction assembly, and a mud conveying rubber hose. The sludge is collected by the mud scraper and then sucked out by the mud pumping and suction assembly, and enters the magnetic recovery assembly through the mud conveying rubber hose to recycle the magnetic seeds.

[0013] Furthermore, the first cell of the inlet reaction zone, the second cell of the inlet reaction zone, and the third cell of the inlet reaction zone are connected by staggered openings on the connected pool wall, so as to ensure that the sewage does not short-circuit in the inlet reaction zone and has sufficient hydraulic retention time to complete the flocculation process;

[0014] The first cell of the water inlet reaction zone, the second cell of the water inlet reaction zone, and the third cell of the water inlet reaction zone are connected by staggered openings in the following manner: the first cell of the water inlet reaction zone has an opening at the top of the water inlet reaction zone connected to the second cell of the water inlet reaction zone, the second cell of the water inlet reaction zone has an opening at the bottom of the water inlet reaction zone connected to the third cell of the water inlet reaction zone, and the third cell of the water inlet reaction zone has an opening at the top of the water inlet reaction zone connected to the water inlet channel of the inclined tube sedimentation zone.

[0015] Furthermore, the first grid of the water inlet reaction zone is the water inlet, coagulant and magnetic seed addition area of ​​the device. The added coagulant is polyaluminum chloride PAC, polyaluminum iron chloride PAFC or ferric chloride FeCl3, and the addition amount is 150-250 mg / L; the added magnetic seed is ferric oxide Fe2O3, ferrous oxide Fe3O4 or ferric sulfate Fe2(SO4)3, the magnetic seed particle size range is 250-400 mesh, the magnetic seed addition amount is 170-250 mg / L, and the stirring intensity G value is 800-1800s -1 The second compartment of the water inlet reaction zone is a flocculant addition zone, and the added flocculant is anionic polyacrylamide PAM or sodium polyacrylate, and the flocculant dosage is 1-3 mg / L; further flocculation reaction occurs in the second compartment of the water inlet reaction zone and the third compartment of the water inlet reaction zone, and the product of the total stirring intensity and time GT value is 36000-72000.

[0016] Furthermore, the inclined tubes in the inclined tube sedimentation zone are honeycomb inclined tubes, the aperture of the upper long inclined tubes is 35-65mm, the aperture of the lower short inclined tubes is 70-120mm, the length ratio of the upper long inclined tubes to the lower short inclined tubes is 10:2-10:4, and the interval between the upper long inclined tubes and the lower short inclined tubes is greater than 800mm.

[0017] Furthermore, the first cell of the oxidation zone, the second cell of the oxidation zone, and the third cell of the oxidation zone are connected with each other by staggered openings in the upper and lower parts, so as to ensure that the sewage does not short-circuit in the oxidation zone and has sufficient hydraulic retention time to complete the oxidation process;

[0018] The first, second and third cells of the oxidation zone are connected by staggered openings on the pool walls in the following manner: the first cell of the oxidation zone has an opening at the upper part of the oxidation zone connected to the outlet trough of the inclined tube sedimentation zone, the first cell of the oxidation zone has an opening at the lower part of the oxidation zone connected to the second cell of the oxidation zone, and the second cell of the oxidation zone has an opening at the upper part of the oxidation zone connected to the third cell of the oxidation zone.

[0019] Furthermore, the first compartment of the oxidation zone is a water inlet and oxidant addition area, the added oxidant is sodium hypochlorite, hydrogen peroxide, ozone or liquid chlorine, the molar ratio of the added oxidant to the ammonia nitrogen in the inlet water is 1:3 to 2:1, and the stirring intensity G value of the first compartment of the oxidation zone is 400-600s -1 The oxidized sewage is discharged through the outlet pipe.

[0020] Furthermore, the traveling mud discharger (31) takes 5-14 minutes to complete one reciprocating operation in the device, and operates continuously. Every time the traveling mud discharger reciprocates two to five times, the pumping mud suction component operates once.

[0021] Furthermore, the electromagnet is installed on a support platform below the traveling mud discharger. The electromagnets are evenly and symmetrically arranged on the support platform. The distance between adjacent electromagnets is 1-2m. The electromagnet is energized when the pump suction mud assembly is closed. When energized, the magnetic field strength generated by the electromagnet is 200-350mT. The magnetic field strength weakens as the distance from the electromagnet increases. The formed magnetic field gradient accelerates the precipitation of the surrounding magnetic flocs.

[0022] Furthermore, the mudguard is made of polyvinyl chloride, rigid polyvinyl chloride or polypropylene, and its cross-sectional shape is formed by two sides of a triangle, so as to prevent the magnetic flocs from adhering and accumulating on the electromagnet. When the electromagnet is not energized, the magnetic flocs can slide and settle.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] (1) The integrated magnetic coagulation and sedimentation device of the present invention is equipped with magnetic sedimentation technology. By screening the type and particle size of magnetic species and optimizing the stirring intensity, the magnetic flocs can form a larger fractal dimension in a shorter reaction time, making the floc structure dense. Under the action of magnetic sedimentation, the sedimentation rate is greatly improved, and the floc sedimentation time is reduced.

[0025] (2) In the present invention, an additional layer of lower short inclined tubes is added below the original long inclined tubes in the inclined tube sedimentation area. The lower short inclined tubes can rectify the turbulent water inflow, intercept large particles of magnetic flocs, and increase the solid content of the sludge by 4%, effectively reducing the sludge volume. The upper long inclined tubes further settle fine particle pollutants.

[0026] (3) The magnetic field intensity gradient formed by the electromagnet in the magnetic sedimentation zone of the present invention accelerates the sedimentation of the surrounding magnetic flocs. Compared with the traditional magnetic coagulation technology, the sedimentation time of particulate pollutants is shortened by 20%, the removal rate of various pollutants is increased by 20% to 30%, and the moisture content of the sludge is reduced, thereby reducing the energy consumption required for the recovery and utilization of magnetic seeds.

[0027] (4) The present invention integrates magnetic coagulation sedimentation, magnetic settling, magnetic seed recovery and utilization equipment, and tail water oxidation, which is convenient for transportation, installation, operation and maintenance management. The magnetic recovery device located above the water inlet reaction zone is directly connected to the gantry truck mud discharger through a rubber mud delivery hose, which can quickly separate the magnetic seeds and flocs in the magnetic flocs. The magnetic seed recovery rate is more than 99%, ensuring that the device does not need to supplement the magnetic seeds during long-term operation.

[0028] (5) The present invention can effectively remove suspended solids (SS) in overflow sewage, reduce chemical oxygen demand (COD), total phosphorus (TP), ammonia nitrogen (NH4 + -N) and other pollutants, compared with the traditional high-efficiency sedimentation tank, the present invention has a higher concentration of suspended solids (SS), chemical oxygen demand (COD), total phosphorus (TP), ammonia nitrogen (NH4 + -N) removal rates were increased by 20-25%, 12-15%, 15-20%, 50-60% respectively, and hydraulic retention time was reduced by 25-35%. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a front view of the integrated magnetic coagulation and sedimentation device equipped with magnetic sedimentation technology;

[0030] Figure 2 This is a top view of the integrated magnetic coagulation and sedimentation device equipped with magnetic sedimentation technology.

[0031] Reference numerals: 1-water inlet reaction zone, 11-first grid of water inlet reaction zone, 111-water inlet pipe, 12-second grid of water inlet reaction zone, 13-third grid of water inlet reaction zone, 14-first agitator;

[0032] 2- inclined tube sedimentation area, 21- upper long inclined tube, 22- lower short inclined tube, 23- outlet trough, 24- inlet channel;

[0033] 3-magnetic sedimentation area, 31-traveling mud discharger, 311-driving assembly, 312-mud scraper, 313-pumping mud suction assembly, 314-mud delivery rubber hose, 32-electromagnet, 33-mud guard;

[0034] 4-oxidation zone, 41-first cell of oxidation zone, 42-second cell of oxidation zone, 43-third cell of oxidation zone, 431-water outlet pipe, 44-second agitator;

[0035] 5-magnetic recovery component, 51-magnetic separator, 52-high shear machine, 53-sludge return pipe, 54-sludge discharge pipe. DETAILED DESCRIPTION

[0036] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. Component models, material names, connection structures, control methods, algorithms and other features not clearly described in this technical solution are all considered to be common technical features disclosed in the prior art.

[0037] Example 1

[0038] This embodiment provides a magnetic coagulation and precipitation integrated device equipped with magnetic sedimentation technology, such as Figure 1 , 2 As shown, it includes: a water inlet reaction zone 1, an inclined tube sedimentation zone 2, a magnetic sedimentation zone 3, an oxidation zone 4, and a magnetic recovery component 5;

[0039] The water inlet reaction zone 1 comprises: a first water inlet reaction zone grid 11, a second water inlet reaction zone grid 12, a third water inlet reaction zone grid 13, and a water inlet pipe 111. The first water inlet reaction zone grid 11, the second water inlet reaction zone grid 12, and the third water inlet reaction zone grid 13 are all provided with a first agitator 14, which is used to adjust the velocity gradient required for coagulation and flocculation reactions and prevent the magnetic seeds from settling in the water inlet reaction zone. By adding a coagulant, a magnetic seed, and a flocculant to the sewage in the water inlet reaction zone 1, small-sized suspended solids in the sewage can be aggregated into magnetic flocs, thereby increasing the density and magnetism of the flocs.

[0040] The inclined tube sedimentation area 2 is located in the middle of the device, and the magnetic flocs and pollutants are settled in the inclined tube sedimentation area 2, including: an upper long inclined tube 21, a lower short inclined tube 22, a water outlet trough 23, and an inlet channel 24. The lower short inclined tube 22 plays a rectifying role and preliminarily intercepts large particles of magnetic flocs to enhance the sludge concentration effect of the bottom sludge area; the upper long inclined tube 21 further settles fine particle pollutants;

[0041] The magnetic sedimentation area 3 is located below the inclined tube sedimentation area 2, and includes: a driving mud discharger 31, an electromagnet 32, and a mud guard 33 on the electromagnet 32. The sludge from the inclined tube sedimentation area 2 is settled to the magnetic sedimentation area 3. The electromagnet 32 ​​is energized to generate an electromagnetic field to accelerate the sedimentation of magnetic flocs.

[0042] The oxidation zone 4 is located at the end of the device, and includes: a first cell 41 of the oxidation zone, a second cell 42 of the oxidation zone, a third cell 43 of the oxidation zone, and a water outlet pipe 431. The first cell 41 of the oxidation zone is provided with a second agitator 44 for mixing sewage and oxidant; dissolved pollutants in the water are further removed by adding oxidant to the first cell 41 of the oxidation zone;

[0043] The magnetic recovery component 5 is located above the water inlet reaction zone 1. The magnetic recovery component 5 is connected to the traveling sludge discharger 31 through a sludge conveying rubber hose 314. The magnetic recovery component 5 includes: a magnetic separator 51, a high shear machine 52, a sludge return pipe 53 and a sludge discharge pipe 54. It can separate the magnetic seeds and flocs in the magnetic flocs. The magnetic seed recovery rate is more than 99%. The recovered magnetic seeds are returned to the first grid 11 of the water inlet reaction zone through the sludge return pipe 53, and the remaining sludge is discharged through the sludge discharge pipe 54.

[0044] In a specific embodiment, the traveling mud discharger 31 includes: a driving component 311, a mud scraper 312, a mud pumping and suction component 313, and a mud conveying rubber hose 314. The sludge is collected by the mud scraper 312 and then sucked out by the mud pumping and suction component 313, and enters the magnetic recovery component 5 through the mud conveying rubber hose 314 to recycle the magnetic seeds.

[0045] In a specific embodiment, the first cell 11 of the inlet reaction zone, the second cell 12 of the inlet reaction zone, and the third cell 13 of the inlet reaction zone are connected by staggered openings on the connected pool wall, so as to ensure that the sewage does not short-circuit in the inlet reaction zone 1 and has sufficient hydraulic retention time to complete the flocculation process;

[0046] The first cell 11, the second cell 12 and the third cell 13 of the water inlet reaction zone are connected by staggered openings on the pool wall in the following manner: the first cell 11 of the water inlet reaction zone has an opening at the top of the water inlet reaction zone 1 to connect with the second cell 12 of the water inlet reaction zone; the second cell 12 of the water inlet reaction zone has an opening at the bottom of the water inlet reaction zone 1 to connect with the third cell 13 of the water inlet reaction zone; the third cell 13 of the water inlet reaction zone has an opening at the top of the water inlet reaction zone 1 to connect with the water inlet channel (24) of the inclined tube sedimentation zone 2.

[0047] In a specific embodiment, the first grid 11 of the water inlet reaction zone is the water inlet, coagulant and magnetic seed addition area of ​​the device. The added coagulant is polyaluminium chloride PAC, and the addition amount is 200 mg / L; the added magnetic seed is ferric oxide Fe2O3, the magnetic seed particle size range is 325 mesh, the magnetic seed addition amount is 200 mg / L, and the stirring intensity G value is 1600s -1 The second cell 12 of the water inlet reaction zone is a flocculant addition zone, the added flocculant is anionic polyacrylamide PAM, and the flocculant dosage is 2 mg / L; the second cell 12 of the water inlet reaction zone and the third cell 13 of the water inlet reaction zone undergo flocculation reaction in a specific implementation manner, and the product of the total stirring intensity and time GT value is 50,000.

[0048] In a specific embodiment, the inclined tubes in the inclined tube sedimentation area 2 are honeycomb inclined tubes, the aperture of the upper long inclined tube 21 is 50 mm, the aperture of the lower short inclined tube 22 is 80 mm, the length ratio of the upper long inclined tube 21 to the lower short inclined tube 22 is 10:3, and the interval between the upper long inclined tube 21 and the lower short inclined tube 22 is 1000 mm.

[0049] In a specific embodiment, the first cell 41 of the oxidation zone, the second cell 42 of the oxidation zone, and the third cell 43 of the oxidation zone are connected with each other by staggered openings in the upper and lower parts to ensure that the sewage does not short-circuit in the oxidation zone 4 and has sufficient hydraulic retention time to complete the oxidation process;

[0050] The first cell 41, the second cell 42 and the third cell 43 in the oxidation zone are connected by staggered openings on the pool wall as follows: the first cell 41 in the oxidation zone has an opening at the upper part of the oxidation zone 4 to communicate with the outlet trough 23 of the inclined tube sedimentation zone 2, the first cell 41 in the oxidation zone has an opening at the lower part of the oxidation zone 4 to communicate with the second cell 42 in the oxidation zone, and the second cell 42 in the oxidation zone has an opening at the upper part of the oxidation zone 4 to communicate with the third cell 43 in the oxidation zone.

[0051] In a specific embodiment, the first cell 41 of the oxidation zone is a water inlet and oxidant addition area, the added oxidant is sodium hypochlorite, the molar ratio of the added oxidant to the ammonia nitrogen in the inlet is 1.5:1, and the stirring intensity G value of the first cell 41 of the oxidation zone is 500s -1 The oxidized sewage is discharged through the outlet pipe 431.

[0052] In a specific implementation, the traveling mud discharger 31 takes 10 minutes to complete a reciprocating operation in the device, and operates continuously. Every time the traveling mud discharger 31 reciprocates three times, the pumping mud suction component 313 operates once.

[0053] In a specific embodiment, the electromagnet 32 ​​is installed on the support platform below the driving mud discharger 31. The electromagnets 32 are evenly and symmetrically arranged on the support platform. The distance between adjacent electromagnets is 1.5m. The electromagnet 32 ​​is powered on when the pumping mud suction component 313 is closed. When powered on, the magnetic field strength generated by the electromagnet 32 ​​is 250mT. The magnetic field strength decreases with the increase of the distance from the electromagnet 32. The magnetic field gradient formed accelerates the precipitation of the surrounding magnetic flocs. The precipitation time of particulate pollutants is shortened by 20%, the removal rate of each pollutant is increased by 12-60%, and the water content of the sludge is reduced.

[0054] In a specific embodiment, the mud guard 33 is made of polyvinyl chloride, and its cross-sectional shape is formed by two sides of a triangle, which prevents the magnetic flocs from adhering and accumulating on the electromagnet 32. When the electromagnet 32 ​​is not energized, the magnetic flocs can slide and settle.

[0055] Components not described in detail in this embodiment are all existing components that can be purchased through public channels.

[0056] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A magnetic coagulation and precipitation integrated device equipped with magnetic sedimentation technology, characterized in that: include: Influent reaction zone (1), inclined tube sedimentation zone (2), magnetic sedimentation zone (3), oxidation zone (4), magnetic recovery component (5); The water inlet reaction zone (1) comprises: a first water inlet reaction zone grid (11), a second water inlet reaction zone grid (12), a third water inlet reaction zone grid (13), and a water inlet pipe (111); the first water inlet reaction zone grid (11), the second water inlet reaction zone grid (12), and the third water inlet reaction zone grid (13) are all provided with a first agitator (14); by adding a coagulant, a magnetic seed, and a flocculant to the sewage in the water inlet reaction zone (1), small-sized suspended matter in the sewage can be aggregated into magnetic flocs; The inclined tube sedimentation area (2) is located in the middle of the device, and the magnetic flocs and pollutants are settled in the inclined tube sedimentation area (2), which includes: an upper long inclined tube (21), a lower short inclined tube (22), a water outlet trough (23), and a water inlet channel (24). The lower short inclined tube (22) plays a rectifying role and preliminarily intercepts large particles of magnetic flocs, thereby enhancing the sludge concentration effect of the bottom sludge area; the upper long inclined tube (21) further settles fine particle pollutants; The magnetic sedimentation area (3) is located below the inclined tube sedimentation area (2), and comprises: a driving mud discharger (31), an electromagnet (32), and a mud guard (33) on the electromagnet (32). The sludge in the inclined tube sedimentation area (2) is sedimented to the magnetic sedimentation area (3). The electromagnet (32) is energized to generate an electromagnetic field to accelerate the sedimentation of magnetic flocs. The oxidation zone (4) is located at the end of the device, and comprises: a first cell (41) of the oxidation zone, a second cell (42) of the oxidation zone, a third cell (43) of the oxidation zone, and a water outlet pipe (431). The first cell (41) of the oxidation zone is provided with a second agitator (44) for mixing sewage and oxidant. By adding oxidant to the first cell (41) of the oxidation zone, dissolved pollutants in the water are further removed. The magnetic recovery component (5) is located above the water inlet reaction zone (1). The magnetic recovery component (5) is connected to the driving sludge discharger (31) via a sludge delivery rubber hose (314). The magnetic recovery component (5) comprises: a magnetic separator (51), a high shearing machine (52), a sludge return pipe (53) and a sludge discharge pipe (54). The magnetic seeds in the magnetic flocs can be separated from the flocs. The magnetic seed recovery rate reaches more than 99%. The recovered magnetic seeds are returned to the first grid (11) of the water inlet reaction zone through the sludge return pipe (53), and the remaining sludge is discharged through the sludge discharge pipe (54).

2. The integrated magnetic coagulation and precipitation device equipped with magnetic sedimentation technology according to claim 1, characterized in that: The driving mud discharger (31) comprises: a driving component (311), a mud scraper (312), a mud pumping and suction component (313), and a mud conveying rubber hose (314). The sludge is collected by the mud scraper (312), sucked out by the mud pumping and suction component (313), and enters the magnetic recovery component (5) through the mud conveying rubber hose (314) to recover and utilize the magnetic seeds.

3. The integrated magnetic coagulation and precipitation device equipped with magnetic sedimentation technology according to claim 1, characterized in that: The first cell (11) of the inlet reaction zone, the second cell (12) of the inlet reaction zone, and the third cell (13) of the inlet reaction zone are connected by openings staggered up and down on the connected pool wall, so as to ensure that the sewage does not short-circuit in the inlet reaction zone (1) and has sufficient hydraulic retention time to complete the flocculation process; The first cell (11), the second cell (12) and the third cell (13) of the water inlet reaction zone are connected by staggered openings on the pool wall in the following manner: the first cell (11) of the water inlet reaction zone has an opening at the top of the water inlet reaction zone (1) to connect with the second cell (12) of the water inlet reaction zone; the second cell (12) of the water inlet reaction zone has an opening at the bottom of the water inlet reaction zone (1) to connect with the third cell (13) of the water inlet reaction zone; the third cell (13) of the water inlet reaction zone has an opening at the top of the water inlet reaction zone (1) to connect with the water inlet channel (24) of the inclined tube sedimentation zone (2).

4. The integrated magnetic coagulation and precipitation device equipped with magnetic sedimentation technology according to claim 1, characterized in that: The first compartment (11) of the water inlet reaction zone is the water inlet, coagulant and magnetic seed addition area of ​​the device. The added coagulant is polyaluminium chloride PAC, polyaluminium iron chloride PAFC or ferric chloride FeCl3, and the addition amount is 150-250 mg / L; the added magnetic seed is ferric oxide Fe2O3, ferrous oxide Fe3O4 or ferric sulfate Fe2(SO4)3, the magnetic seed particle size range is 250-400 mesh, the magnetic seed addition amount is 170-250 mg / L, and the stirring intensity G value is 800-1800s -1 The second cell (12) of the water inlet reaction zone is a flocculant addition zone, and the added flocculant is anionic polyacrylamide PAM or sodium polyacrylate, and the flocculant addition amount is 1-3 mg / L; the second cell (12) of the water inlet reaction zone and the third cell (13) of the water inlet reaction zone undergo further flocculation reaction, and the product of the total stirring intensity and time GT value is 36000-72000.

5. The integrated magnetic coagulation and precipitation device equipped with magnetic sedimentation technology according to claim 1, characterized in that: The inclined tubes in the inclined tube sedimentation zone (2) are honeycomb inclined tubes, the aperture of the upper long inclined tube (21) is 35-65 mm, the aperture of the lower short inclined tube (22) is 70-120 mm, the length ratio of the upper long inclined tube (21) to the lower short inclined tube (22) is 10:2-10:4, and the interval between the upper long inclined tube (21) and the lower short inclined tube (22) is greater than 800 mm.

6. The integrated magnetic coagulation and precipitation device equipped with magnetic sedimentation technology according to claim 1, characterized in that: The first cell (41), the second cell (42) and the third cell (43) of the oxidation zone are connected to each other by staggered openings on the wall, so as to ensure that the sewage does not short-circuit in the oxidation zone (4) and has sufficient hydraulic retention time to complete the oxidation process; The first cell (41) of the oxidation zone, the second cell (42) of the oxidation zone, and the third cell (43) of the oxidation zone are connected by staggered openings on the pool wall in the following manner: the first cell (41) of the oxidation zone has an opening at the upper part of the oxidation zone (4) to communicate with the outlet trough (23) of the inclined tube sedimentation zone (2); the first cell (41) of the oxidation zone has an opening at the lower part of the oxidation zone (4) to communicate with the second cell (42) of the oxidation zone; and the second cell (42) of the oxidation zone has an opening at the upper part of the oxidation zone (4) to communicate with the third cell (43) of the oxidation zone.

7. The integrated magnetic coagulation and precipitation device equipped with magnetic sedimentation technology according to claim 1, characterized in that: The first compartment (41) of the oxidation zone is a water inlet and oxidant addition area. The added oxidant is sodium hypochlorite, hydrogen peroxide, ozone or liquid chlorine. The molar ratio of the added oxidant to the ammonia nitrogen in the inlet water is 1:3 to 2:

1. The stirring intensity G value of the first compartment (41) of the oxidation zone is 400-600s. -1 The oxidized sewage is discharged through the outlet pipe (431).

8. The integrated magnetic coagulation and precipitation device equipped with magnetic sedimentation technology according to claim 1, characterized in that: The traveling mud discharger (31) takes 5-14 minutes to complete one reciprocating operation in the device. The traveling mud discharger (31) operates continuously. Every time the traveling mud discharger (31) reciprocates two to five times, the pumping mud suction component (313) operates once.

9. The integrated magnetic coagulation and precipitation device equipped with magnetic sedimentation technology according to claim 1, characterized in that: The electromagnet (32) is installed on a support platform below the driving mud discharger (31). The electromagnets (32) are evenly and symmetrically arranged on the support platform. The distance between adjacent electromagnets is 1-2m. The electromagnet (32) is energized when the pumping mud suction component (313) is closed. When energized, the magnetic field strength generated by the electromagnet (32) is 200-350mT. The magnetic field strength decreases as the distance from the electromagnet (32) increases. The magnetic field gradient formed accelerates the precipitation of surrounding magnetic flocs.

10. The integrated magnetic coagulation and precipitation device equipped with magnetic sedimentation technology according to claim 1, characterized in that: The fender (33) is made of polyvinyl chloride, rigid polyvinyl chloride or polypropylene, and has a cross-sectional shape consisting of two sides of a triangle, which prevents the magnetic flocs from adhering and accumulating on the electromagnet (32). When the electromagnet (32) is not energized, the magnetic flocs can slide down and settle.

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