Oxygen-enriched magnetic coagulating sedimentation system

Abstract

The utility model provides an oxygen-enriched magnetic coagulating sedimentation system, and belongs to the technical field of water pollution treatment. The oxygen-enriched magnetic coagulation sedimentation system comprises an oxygen-enriched reaction system, a magnetic coagulation reaction system, a sedimentation system, a magnetic separation system, a sludge tank and a clean water tank, the oxygen-enriched reaction system comprises an oxygen-enriched tank, an air supply device and an oxidizing agent adding device; the oxygen-enriched tank is communicated with the sludge tank; the magnetic coagulation reaction system comprises a magnetic coagulation reaction tank communicated with the oxygen enrichment tank, a flocculating agent adding device, a pH value adjusting device and a coagulation agent adding device; the sedimentation system comprises a sedimentation tank communicated with the magnetic coagulation reaction tank, the magnetic separation system and the clean water tank; the magnetic separation system is respectively communicated with the magnetic coagulation reaction tank and the sludge tank. By means of the synergistic effect of oxygen enrichment and magnetic coagulation, ferrous ions are basically completely oxidized and efficiently precipitated, effluent is clear and cannot become turbid again, the problem that suspended solids, chromaticity and the like of reducing mine water exceed the standard is fundamentally solved, and the application and popularization prospects are good.

Description

Technical Field

[0001] This application relates to the field of wastewater purification technology, specifically to an oxygen-enriched magnetic coagulation sedimentation system. Background Technology

[0002] Mining enterprises in my country that operate underground, including those mining gold, copper, coal, and iron ore, typically encounter problems with excessive levels of suspended solids (SS), ferrous sulfate (FSS), carbon dioxide (COD), and color in their mine water as mining progresses. These mine waters require treatment to meet standards before discharge or reuse. However, mine water is generally characterized by large production volumes, stable pollutant composition, high color, poor sensory quality, and a tendency for the treated liquid phase to deteriorate over time. If not treated to consistently meet standards, these pollutants can enter water bodies, polluting the environment, harming aquatic life, and endangering human health. Furthermore, excessive color at and near the drainage outlets of these water bodies negatively impacts their sensory quality.

[0003] Currently, the general technology for treating mine water is flocculation sedimentation. This technology has low reaction efficiency, poor treatment capacity, poor resistance to fluctuations in water quality and quantity, requires a large buffer tank before treatment, occupies a large area, and the treatment effect is unstable. After a period of time, the treated water is easily turbid again, and suspended solids (SS) and color exceed the standards again, resulting in poor taste and appearance of the discharged water.

[0004] In view of this, it is necessary to provide an oxygen-enriched magnetic coagulation sedimentation system to solve the above problems. Summary of the Invention

[0005] In view of the problems existing in the background technology, this application provides an oxygen-enriched magnetic coagulation sedimentation system. The sedimentation system adopts the synergistic effect of oxygen-enriched environment and magnetic coagulation sedimentation, and the reducing substances in the treated liquid phase are decomposed or transformed into stable forms, which can effectively prevent the problems of unstable effluent indicators and clear water remixing.

[0006] This application provides an oxygen-enriched magnetic coagulation sedimentation system, including an oxygen-enriched reaction system, a magnetic coagulation reaction system, a sedimentation system, a magnetic separation system, a sludge tank, and a clear water tank.

[0007] The oxygen-enriched reaction system includes an oxygen-enriched tank and an air supply device and an oxidant dosing device respectively connected to the oxygen-enriched tank; the lower sludge discharge port of the oxygen-enriched tank is connected to the sludge tank.

[0008] The magnetic coagulation reaction system includes a magnetic coagulation reaction tank connected to the upper drainage outlet of the oxygen-enriched tank, and a flocculant dosing device, a pH adjustment device, and a coagulant dosing device respectively connected to the magnetic coagulation reaction tank.

[0009] The sedimentation system includes a sedimentation tank connected to the magnetic sludge outlet of the magnetic coagulation reaction tank; the overflow outlet of the sedimentation tank is connected to the clear water tank, and the underflow outlet of the sedimentation tank is connected to the feed inlet of the magnetic separation system.

[0010] The magnetic separation system is used to separate magnetic seeds from sludge in the underflow. The magnetic seed outlet of the magnetic separation system is connected to the magnetic coagulation reaction tank, and the sludge outlet of the magnetic separation system is connected to the sludge tank.

[0011] In the technical solution of this application embodiment, an oxygen-enriched reaction system is used for aeration and oxygenation to increase the oxygen content in the liquid phase, removing some impurities and reducing substances. Simultaneously, oxidizing agents can be added to further remove organic matter. In the magnetic coagulation system, by adding magnetic seeds, flocculants, coagulants, and pH adjusting agents, unstable suspended solids or dissolved substances are transformed into stable particulate matter. At the same time, the coagulants and flocculants cause the particulate matter to aggregate into larger particles, which then settle together with the magnetic seeds, resulting in clear water that does not repeatedly become turbid. Under the synergistic effect of oxygen enrichment and magnetic coagulation, reducing substances in the liquid phase are almost completely oxidized by ferrous ions, and efficiently and stably precipitate in the sedimentation tank, resulting in clear effluent that does not become turbid again. This fundamentally addresses the problem of excessive suspended solids and color in reducing (ferrous) mine water.

[0012] In some embodiments, the oxygen-enriched tank is equipped with a swirling microbubble aeration and oxygenation stirring device, the air supply device includes a blower, and the outlet of the blower is connected to the swirling microbubble aeration and oxygenation stirring device through a ventilation duct; the oxidant dosing device includes an oxidant dosing tank, and the oxidant dosing tank is connected to the top of the oxygen-enriched tank through an oxidant delivery pump.

[0013] In this embodiment, the air supply device provides oxygen to the liquid phase, and the swirling microbubble aeration and oxygenation stirring device generates microbubbles from the broken air, while simultaneously creating vortices in the liquid phase, ensuring thorough stirring and full contact between gas and liquid. This increases the dissolved oxygen in the liquid phase, raising the DO value to above 4.5 mg / L, and also increases the probability of contact between reducing substances such as ferrous ions and dissolved oxygen. At the same time, an oxidizing agent is added to the oxygen-enriched tank using an oxidizing agent dosing device. In the liquid phase, excess oxygen in the oxidizing agent is released to generate oxygen free radicals, which fully oxidize ferrous ions to ferric ions, and other reducing substances are also oxidized to more stable oxidation states, resulting in complete decomposition of COD.

[0014] In some embodiments, the swirling microbubble aeration and oxygenation mixing device includes multiple oxygenation and mixing devices; the multiple swirling microbubble aeration and oxygenation mixing devices are evenly arranged in the upper part of the oxygen-enriched tank.

[0015] In this embodiment, by evenly arranging multiple swirling microbubble aeration and oxygenation stirring devices in the oxygen-enriched tank, the oxygen supply is more sufficient, the gas and liquid are in more complete contact, and the dissolved oxygen in the liquid phase is greatly increased.

[0016] In some embodiments, a magnetic coagulation stirring device is provided in the magnetic coagulation reaction tank, and an overflow weir is provided at the top of the magnetic coagulation reaction tank; the magnetic coagulation stirring device is a multi-stage stirring device; and the overflow weir has a sawtooth structure.

[0017] In this embodiment, by setting up a multi-stage stirring device, the various agents can be mixed more thoroughly, and the serrated overflow weir can achieve uniform water discharge, prevent water short-circuiting, maintain the liquid layer on the plate, and make the liquid overflow uniformly.

[0018] In some embodiments, the pH adjustment device includes a pH adjustment agent dosing tank and an automatic pH adjustment operating system; the pH adjustment agent dosing tank is connected to the magnetic coagulation reaction tank via a pH adjustment agent delivery pump; the automatic pH adjustment operating system includes a pH monitoring device installed in the magnetic coagulation reaction tank and a flow adjustment device installed in the pH adjustment agent delivery pump.

[0019] In this embodiment, the automatic pH adjustment operating system determines the relationship between the dosage and pH value based on the data fed back by the pH monitoring device installed in the magnetic coagulation reactor. After setting the parameters, it automatically changes the flow rate of the pH adjustment agent delivery pump to adjust the pH value in the magnetic coagulation reactor and stabilize it between 6 and 9.

[0020] In some embodiments, the coagulant dosing device includes a coagulant dosing tank, which is connected to the top of the magnetic coagulation reaction tank via a coagulant delivery pump.

[0021] In this embodiment, a coagulant dosing device is used to add sufficient coagulant to the magnetic coagulation reaction tank, causing colloidal particles and tiny suspended solids in the water to aggregate.

[0022] In some embodiments, the flocculant dosing device includes a metering pump; the flocculant dosing device is connected to the dosing points at the front, middle and rear ends of the magnetic coagulation reaction tank.

[0023] In this embodiment, the flocculant dosing device is connected to the dosing points at the front, middle and rear ends of the magnetic coagulation reaction tank to achieve multi-point dosing, which makes the flocculant mix with the liquid more thoroughly and the flocculation effect better.

[0024] In some embodiments, the magnetic separation system includes a high-shear mill connected to the sedimentation tank and a magnetic separation device connected to the high-shear mill; the magnetic seed outlet of the magnetic separation device is connected to the magnetic coagulation reaction tank, and the sludge outlet of the magnetic separation device is connected to the sludge tank.

[0025] In this embodiment, the bottom sludge in the sedimentation tank is transported to a high-shear mill, which breaks up the large particles generated by the magnetic seeds and other substances, thus separating the magnetic seeds and sludge that are bound together. Then, the magnetic seeds and sludge are separated by the magnetic properties of the magnetic separation device. The separated magnetic seeds are returned to the magnetic coagulation reaction tank for recycling, while the sludge is transported to the sludge tank.

[0026] In some embodiments, the sedimentation tank is provided with a sludge scraping system, which is vertically positioned in the sedimentation tank; an inclined plate sedimentation layer is provided at the top of the sedimentation tank; and the sedimentation tank is connected to the high shear machine via a sedimentation underflow conveying pump.

[0027] In this embodiment, the sedimentation effect of particulate matter is enhanced by using an inclined plate sedimentation layer, and the bottom sludge in the sedimentation tank is transferred to the sedimentation bottom sludge transfer pump through a sludge scraping system.

[0028] The following is an overview of the technical solution of this application. In order to make the technical means of this application clearer and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in this application will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0030] Figure 1 This is a schematic diagram of a simulated structure of an oxygen-enriched magnetic coagulation sedimentation system in an embodiment of this application.

[0031] Explanation of reference numerals in the attached drawings: 11. Oxygen-enriched tank; 111. Swirl microbubble aeration and oxygenation mixing device; 12. Air supply device; 121. Blower; 13. Oxidizing agent dosing device; 131. Oxidizing agent dosing tank; 132. Oxidizing agent transfer pump; 21. Magnetic coagulation reaction tank; 211. Magnetic coagulation mixing device; 212. Overflow weir; 22. Flocculant dosing device; 23. pH adjustment device; 231. pH adjusting agent dosing tank; 232. pH adjusting agent transfer pump; 233. Automatic pH adjustment operating system; 24. Coagulant dosing device; 241. Coagulant dosing tank; 242. Coagulant transfer pump; 31. Sedimentation tank; 311. Sludge scraping system; 312. Inclined plate sedimentation layer; 32. Sedimentation underflow transfer pump; 41. Magnetic separation device; 42. High shear machine; 5. Sludge tank; 6. Clear water tank. Detailed Implementation

[0032] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0034] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0035] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), and the technical terms "left," "right," "top," "bottom," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0036] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms "installation," "connection," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0037] Currently, the flocculation and sedimentation treatment technology for mine water has low reaction efficiency, poor treatment capacity, poor resistance to fluctuations in water quality and quantity, and unstable treatment effect.

[0038] To address the technical problems of poor and unstable treatment effects in mine water, this application provides an oxygen-enriched magnetic coagulation sedimentation system, which can decompose or transform reducing substances in the treated liquid phase into stable forms, effectively preventing problems such as unstable effluent indicators and remixing of clear water.

[0039] The present application will be further described below with reference to specific implementation methods.

[0040] Please see Figure 1 This application provides an oxygen-enriched magnetic coagulation sedimentation system, including an oxygen-enriched reaction system, a magnetic coagulation reaction system, a sedimentation system, a magnetic separation system, a sludge tank 5, and a clear water tank 6;

[0041] The oxygen-enriched reaction system includes an oxygen-enriched tank 11 and an air supply device 12 and an oxidant dosing device 13 respectively connected to the oxygen-enriched tank 11; the lower sludge discharge port of the oxygen-enriched tank is connected to the sludge tank 5.

[0042] The magnetic coagulation reaction system includes a magnetic coagulation reaction tank 21 connected to the upper drain outlet of the oxygen-enriched tank 11, and a flocculant dosing device 22, a pH adjustment device 23, and a coagulant dosing device 24 respectively connected to the magnetic coagulation reaction tank 21.

[0043] The sedimentation system includes a sedimentation tank 31 connected to the magnetic sludge outlet of the magnetic coagulation reaction tank 21; the overflow outlet of the sedimentation tank 31 is connected to the clear water tank 6, and the underflow outlet of the sedimentation tank 31 is connected to the feed inlet of the magnetic separation system.

[0044] The magnetic separation system is used to separate magnetic seeds from sludge in the underflow. The magnetic seed outlet of the magnetic separation system is connected to the magnetic coagulation reaction tank 21, and the sludge outlet of the magnetic separation system is connected to the sludge tank 5.

[0045] Through the above methods, an oxygen-enriched reaction system is used for aeration and oxygenation to increase the oxygen content in the liquid phase, removing some impurities and reducing substances. Simultaneously, oxidizing agents can be added to further remove organic matter. In the magnetic coagulation system, by adding magnetic seeds, flocculants, coagulants, and pH adjusters, unstable suspended solids or dissolved substances are transformed into stable particulate matter. At the same time, the coagulants and flocculants aggregate the particulate matter into larger particles, which then settle together with the magnetic seeds, resulting in clear water that does not repeatedly become turbid. Under the synergistic effect of oxygen enrichment and magnetic coagulation, reducing substances in the liquid phase are almost completely oxidized by ferrous ions, and efficiently and stably precipitate in sedimentation tank 31. The effluent is clear and will not become turbid again, fundamentally addressing the problems of excessive suspended solids and color in reducing (ferrous) mine water.

[0046] Furthermore, in this embodiment of the application, the oxygen-enriched tank 11 is provided with a swirling microbubble aeration and oxygenation stirring device 111, the air supply device 12 includes a blower 121, the air outlet of the blower 121 is connected to the swirling microbubble aeration and oxygenation stirring device 111 through a ventilation pipe; the oxidizing agent dosing device 13 includes an oxidizing agent dosing tank 131, the oxidizing agent dosing tank 131 is connected to the top of the oxygen-enriched tank 11 through an oxidizing agent delivery pump 132.

[0047] In this embodiment, the air supply device 12 provides oxygen to the liquid phase. The swirling microbubble aeration and oxygenation stirring device 111 generates microbubbles from the broken air, simultaneously creating a vortex in the liquid phase for thorough stirring and sufficient gas-liquid contact. This increases the dissolved oxygen in the liquid phase, raising the DO value to above 4.5 mg / L and also increasing the probability of contact between reducing substances such as ferrous ions and dissolved oxygen. Simultaneously, the oxidant dosing device 13 adds oxidant to the oxygen-enriched tank 11. In the liquid phase, excess oxygen in the oxidant is released to generate oxygen free radicals, which fully oxidize ferrous ions to ferric ions. Other reducing substances are also oxidized to more stable oxidation states, resulting in complete COD decomposition. The number of fans 121 in the air supply device 12 can be set to one or more as needed. When multiple fans 121 are used, they are preferably connected in parallel.

[0048] Furthermore, in this embodiment of the application, the swirl microbubble aeration and oxygenation stirring device 111 includes multiple oxygenation stirring devices; the multiple swirl microbubble aeration and oxygenation stirring devices 111 are evenly arranged in the upper part of the oxygen-enriched tank.

[0049] In this embodiment, by uniformly arranging multiple swirling microbubble aeration and stirring devices 111 in the oxygen-enriched tank, oxygen supply is more sufficient, gas-liquid contact is more complete, and dissolved oxygen in the liquid phase is greatly increased. Each aeration and stirring device can be independently, in series, or in parallel, but is more preferably in parallel.

[0050] Furthermore, in the embodiments of this application, the oxidizing agent in the oxidizing agent dosing device 13 includes one or more of potassium ferrate, hydrogen peroxide, and ozone.

[0051] Furthermore, in this embodiment of the application, a magnetic coagulation stirring device 211 is provided in the magnetic coagulation reaction tank 21, and an overflow weir 212 is provided on the top of the magnetic coagulation reaction tank 21; the magnetic coagulation stirring device 211 is a multi-stage stirring device; and the overflow weir 212 has a sawtooth structure.

[0052] In this embodiment, by setting up a multi-stage stirring device, the various agents can be mixed more thoroughly, and the serrated overflow weir 212 can achieve uniform water discharge, prevent water short-circuiting, maintain the liquid layer on the plate, and make the liquid overflow uniformly.

[0053] Furthermore, in this embodiment of the application, the magnetic seeds in the magnetic coagulation reaction tank 21 need to be replenished daily, with a replenishment amount of 3~10 g / m³.

[0054] Further, in this embodiment, the pH adjustment device 23 includes a pH adjustment agent dosing tank 231 and a pH automatic adjustment operating system 233; the pH adjustment agent dosing tank 231 is connected to the magnetic coagulation reaction tank 21 via a pH adjustment agent delivery pump 232; the pH automatic adjustment operating system 233 includes a pH monitoring device installed in the magnetic coagulation reaction tank 21 and a flow adjustment device installed in the pH adjustment agent delivery pump 232.

[0055] In this embodiment, the automatic pH adjustment operating system 233 determines the relationship between the dosage and pH value based on the data fed back by the pH monitoring device installed in the magnetic coagulation reaction tank 21, sets the parameters, and automatically changes the flow rate of the pH adjustment agent delivery pump 232 to adjust the pH value in the magnetic coagulation reaction tank 21 and stabilize it between 6 and 9.

[0056] Furthermore, in the embodiments of this application, the pH adjusting agent in the pH adjusting device 23 includes one or more of sodium hydroxide, lime, carbide slag, sulfuric acid, hydrochloric acid, and nitric acid.

[0057] Furthermore, in this embodiment of the application, the coagulant dosing device 24 includes a coagulant dosing tank 241, which is connected to the top of the magnetic coagulation reaction tank 21 via a coagulant delivery pump 242.

[0058] In this embodiment, a coagulant dosing device 24 is used to add sufficient coagulant to the magnetic coagulation reaction tank 21, so that colloidal particles and tiny suspended solids in the water aggregate.

[0059] Furthermore, in the embodiments of this application, the coagulant in the coagulant dosing device 24 includes one or more of polyferric sulfate and polyaluminum sulfate.

[0060] Furthermore, in this embodiment of the application, the flocculant dosing device 22 includes a metering pump; the flocculant dosing device 22 is connected to the dosing points at the front end, middle end and rear end of the magnetic coagulation reaction tank 21.

[0061] In this embodiment, the flocculant dosing device 22 is connected to the dosing points at the front, middle and rear ends of the magnetic coagulation reaction tank 21 to achieve multi-point dosing, so that the flocculant and liquid are mixed more thoroughly and the flocculation effect is better.

[0062] Furthermore, in this embodiment of the application, the magnetic separation system includes a high-shear mill 42 connected to the sedimentation tank 31 and a magnetic separation device 41 connected to the high-shear mill 42; the magnetic seed outlet of the magnetic separation device 41 is connected to the magnetic coagulation reaction tank 21, and the sludge outlet of the magnetic separation device 41 is connected to the sludge tank 5.

[0063] In this embodiment, the bottom sludge in the sedimentation tank 31 is transported to the high shear machine 42. The high shear machine 42 breaks up the large particles generated by the magnetic seeds and other substances, so that the magnetic seeds and sludge that are combined together are dispersed. Then, the magnetic seeds and sludge are separated by the magnetic properties of the magnetic separation device 41. The separated magnetic seeds are returned to the magnetic coagulation reaction tank 21 for recycling, and the sludge is transported to the sludge tank 5.

[0064] Furthermore, in this embodiment of the application, the sedimentation tank 31 is provided with a sludge scraping system 311, which is vertically placed in the sedimentation tank 31; the upper part of the sedimentation tank 31 is provided with an inclined plate sedimentation layer 312; the sedimentation tank 31 is connected to the high shear machine 42 through a sedimentation underflow conveying pump 32.

[0065] In this embodiment, by using an inclined plate sedimentation layer 312 to enhance the settling effect of particulate matter, the bottom sludge in the sedimentation tank 31 is transferred to the sedimentation bottom sludge transfer pump 32 through the sludge scraping system 311.

[0066] The working process of the oxygen-enriched magnetic coagulation sedimentation system provided in this application is roughly as follows:

[0067] Mine water first enters the oxygen-enriched tank 11, where large particles settle. Oxygen is then supplied by a blower 121 in the air supply device 12 through ventilation ducts to the swirling microbubble aeration and agitation device 111 in the oxygen-enriched tank 11. The swirling microbubble aeration and agitation device 111 breaks up the air to generate microbubbles, simultaneously creating vortices in the liquid phase, thus thoroughly agitating the liquid and ensuring a dissolved oxygen (DO) value above 4.5%. mg / L, and simultaneously, oxidizing agents (including but not limited to potassium ferrate, hydrogen peroxide, ozone, etc.) are added to the oxygen-enriched tank 11 using the oxidizing agent dosing device 13. In the liquid phase, excess oxygen in the oxidizing agent is released to generate oxygen free radicals, which fully oxidize ferrous ions to ferric ions, and other reducing substances are also oxidized to more stable oxidation states. Then, the upper layer liquid in the oxygen-enriched tank 11 flows by gravity into the magnetic coagulation reaction tank 21. Sufficient magnetic seeds are added to the magnetic coagulation reaction tank 21. At the same time, sufficient flocculant (anionic polyacrylamide) is added to the magnetic coagulation reaction tank 21 through the flocculant dosing device 22. Sufficient pH adjusting agents (including but not limited to sodium hydroxide, lime, carbide slag, etc.) are added to the magnetic coagulation reaction tank 21 through the pH adjusting device 23 to maintain the pH value between 6 and 9. Sufficient coagulant (including but not limited to sodium hydroxide, lime, carbide slag, etc.) is added to the magnetic coagulation reaction tank 21 through the coagulation agent dosing device 24. (Not limited to polyferric sulfate, polyaluminum sulfate, etc.) In the magnetic coagulation reactor 21, a 6-stage stirring method is used for stirring. The overflow weir 212 in the magnetic coagulation reactor 21 has a sawtooth structure to achieve uniform water discharge and prevent short circuits in the water path. The upper layer liquid in the magnetic coagulation reactor 21 flows into the sedimentation tank 31 by gravity. The liquid settles in the inclined plate sedimentation layer 312 in the sedimentation tank 31. The upper layer liquid in the sedimentation tank 31 is transported to the clear water tank 6 through the clear water conveying pipeline. The bottom sludge is conveyed to the sedimentation bottom sludge conveying pump 32 through the sludge scraping system 311 and then pumped to the high shear machine 42. The high shear machine 42 disperses the large particles generated by the magnetic seeds and other substances, so that the magnetic seeds and sludge that are combined together are dispersed. Then, the magnetic seeds and sludge are separated by magnetic separation in the magnetic separation device 41. The separated magnetic seeds are transported to the magnetic coagulation reactor 21 for recycling through the magnetic seed conveying pipeline. The separated sludge is transported to the sludge tank 5 through the sludge conveying pipeline.

[0068] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. An oxygen-enriched magnetic coagulation sedimentation system, characterized in that, It includes an oxygen-enriched reaction system, a magnetic coagulation reaction system, a sedimentation system, a magnetic separation system, a sludge tank, and a clear water tank; The oxygen-enriched reaction system includes an oxygen-enriched tank and an air supply device and an oxidant dosing device respectively connected to the oxygen-enriched tank; the lower sludge discharge port of the oxygen-enriched tank is connected to the sludge tank. The magnetic coagulation reaction system includes a magnetic coagulation reaction tank connected to the upper drainage outlet of the oxygen-enriched tank, and a flocculant dosing device, a pH adjustment device, and a coagulant dosing device respectively connected to the magnetic coagulation reaction tank. The sedimentation system includes a sedimentation tank connected to the magnetic sludge outlet of the magnetic coagulation reaction tank; the overflow outlet of the sedimentation tank is connected to the clear water tank, and the underflow outlet of the sedimentation tank is connected to the feed inlet of the magnetic separation system. The magnetic separation system is used to separate magnetic seeds from sludge in the underflow. The magnetic seed outlet of the magnetic separation system is connected to the magnetic coagulation reaction tank, and the sludge outlet of the magnetic separation system is connected to the sludge tank.

2. The oxygen-enriched magnetic coagulation sedimentation system according to claim 1, characterized in that, The oxygen-enriched tank is equipped with a swirling microbubble aeration and oxygenation stirring device. The air supply device includes a blower, and the outlet of the blower is connected to the swirling microbubble aeration and oxygenation stirring device through a ventilation duct. The oxidant dosing device includes an oxidant dosing tank, and the oxidant dosing tank is connected to the top of the oxygen-enriched tank through an oxidant delivery pump.

3. The oxygen-enriched magnetic coagulation sedimentation system according to claim 2, characterized in that, The swirling microbubble aeration and oxygenation mixing device includes multiple oxygenation and mixing devices; the multiple swirling microbubble aeration and oxygenation mixing devices are evenly arranged in the upper part of the oxygen-enriched tank.

4. The oxygen-enriched magnetic coagulation sedimentation system according to claim 1, characterized in that, The magnetic coagulation reaction tank is equipped with a magnetic coagulation stirring device, and an overflow weir is provided at the top of the magnetic coagulation reaction tank.

5. The oxygen-enriched magnetic coagulation sedimentation system according to claim 4, characterized in that, The magnetic coagulation stirring device is a multi-stage stirring device; the overflow weir has a sawtooth structure.

6. The oxygen-enriched magnetic coagulation sedimentation system according to claim 1, characterized in that, The pH adjustment device includes a pH adjustment agent dosing tank and an automatic pH adjustment operating system; the pH adjustment agent dosing tank is connected to the magnetic coagulation reaction tank via a pH adjustment agent delivery pump; the automatic pH adjustment operating system includes a pH monitoring device installed in the magnetic coagulation reaction tank and a flow adjustment device installed in the pH adjustment agent delivery pump.

7. The oxygen-enriched magnetic coagulation sedimentation system according to claim 1, characterized in that, The coagulant dosing device includes a coagulant dosing tank, which is connected to the top of the magnetic coagulation reaction tank via a coagulant delivery pump.

8. The oxygen-enriched magnetic coagulation sedimentation system according to claim 1, characterized in that, The flocculant dosing device includes a metering pump; the flocculant dosing device is connected to the dosing points at the front, middle and rear ends of the magnetic coagulation reaction tank.

9. The oxygen-enriched magnetic coagulation sedimentation system according to claim 1, characterized in that, The magnetic separation system includes a high-shear mill connected to the sedimentation tank and a magnetic separation device connected to the high-shear mill; the magnetic seed outlet of the magnetic separation device is connected to the magnetic coagulation reaction tank, and the sludge outlet of the magnetic separation device is connected to the sludge tank.

10. The oxygen-enriched magnetic coagulation sedimentation system according to claim 9, characterized in that, The sedimentation tank is equipped with a sludge scraping system, which is vertically positioned within the sedimentation tank; an inclined plate sedimentation layer is provided at the top of the sedimentation tank; the sedimentation tank is connected to the high-speed shear machine via a sedimentation underflow conveying pump.

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