Ozone catalytic oxidation and magnetic coagulation integrated sewage treatment system

Abstract

The utility model provides a sewage treatment system integrating ozone catalytic oxidation and magnetic coagulation. The sewage treatment system comprises an oxygen preparation device, an ozone generator device, an ozone adding device, at least one ozone reactor, a coagulation device, a flocculation device and a sediment clarification device which are connected in sequence, the ozone adding device is connected with the at least one ozone reactor through a water inlet pipe, a catalyst adding tank, a tail gas destroying device connected with the at least one ozone reactor and a coagulant adding tank connected with the coagulation device are arranged in the at least one ozone reactor; one end of the precipitation clarification device is connected with the flocculation device through a first pipeline, and the other end of the precipitation clarification device is connected with a magnetic powder recovery system and then discharges sludge. The ozone catalytic oxidation process of the system is high in ozone utilization rate; compared with common coagulating sedimentation, the magnetic coagulation system has the advantage that flocculent bodies can be precipitated more easily.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to an ozone catalytic oxidation and magnetic coagulation integrated sewage treatment system. Background Art

[0002] Ozone contact oxidation and activated carbon biofilter are commonly used as deep treatment processes in industrial wastewater treatment. The ozone oxidation efficiency is low (no catalyst, only ozone aeration), the activated carbon needs to be regenerated, and the loss rate is high.

[0003] Ozone contact oxidation and activated carbon technology is a process in which the water to be treated is oxidized by ozone in an ozone contact tank, large molecular organic matter is oxidized into small molecular organic matter that is easily adsorbed by activated carbon, and oxygen is added to the water (which can enhance the biological activity of activated carbon) before entering the activated carbon biofilter.

[0004] The defects are: ① The ozone oxidation unit directly introduces ozone gas into the water to be treated, and the ozone utilization rate is low. And the single ozone direct oxidation reaction is selective and cannot completely degrade all organic pollutants in the wastewater, and the degradation is incomplete. ② The process is difficult to control: Ozone that is not completely decomposed will have an adverse effect on the subsequent biological activated carbon, and residual ozone may have a negative impact on the biofilm (microbial flora) attached to the biological activated carbon (ozone will destroy the biofilm and kill it), and the expected effect cannot be achieved. ③ The biofilm on the activated carbon will fall off and needs to be backwashed regularly, but the angular activated carbon is easy to break when rubbing against each other during backwashing, and the activated carbon filter material is a lightweight filter material. It is easy to lose if the backwashing intensity is too high, and it is not easy to rinse it clean if the backwashing intensity is low, which affects the water output effect. ④ The activated carbon needs to be regenerated or replaced regularly. Utility Model Content

[0005] The utility model provides a sewage treatment system integrating ozone catalytic oxidation and magnetic coagulation, which is used to solve the problems in the prior art of low ozone utilization rate in ozone contact oxidation and activated carbon biofilter, incomplete degradation of all organic pollutants in wastewater, incompletely decomposed ozone having adverse effects on subsequent process flow, detachment and damage of biofilm on activated carbon, and the need for regular regeneration or replacement of activated carbon.

[0006] To solve the above technical problems, the technical solution of this novel invention is as follows:

[0007] An ozone catalytic oxidation and magnetic coagulation integrated sewage treatment system, comprising an oxygen preparation device, an ozone generator device, an ozone dosing device, at least one ozone reactor, a coagulation device, a flocculation device, and a sedimentation and clarification device connected in sequence;

[0008] It also includes a water inlet pipe connected to the ozone dosing device and the ozone reactor, at least one of the ozone reactors is provided with a catalyst dosing tank, a tail gas destruction device connected to at least one of the ozone reactors, a coagulant dosing tank connected to the coagulation device, a flocculant dosing tank connected to the flocculation device, the sedimentation and clarification device is connected to the flocculation device through one end of the first pipeline, and the other end is connected to the magnetic powder recovery system to discharge the sludge.

[0009] Preferably, the coagulation device and the flocculation device are both provided with a mechanical stirring device.

[0010] Preferably, a sludge hopper is provided at the bottom of the sedimentation and clarification device.

[0011] Preferably, a sludge scraping device is provided inside the sedimentation and clarification device.

[0012] Preferably, a guide tube is provided in the flocculation device.

[0013] Preferably, an inclined tube device is connected to the top of the sedimentation and clarification device.

[0014] Preferably, the oxygen preparation device is one of a pressure swing adsorption oxygen production equipment and a low-pressure adsorption vacuum desorption oxygen production equipment.

[0015] Preferably, the ozone dosing device is provided with a dosing device, and the dosing device is one of an aeration plate, a high-efficiency gas dissolving device, and an ejector.

[0016] The above solution of the utility model includes at least the following beneficial effects:

[0017] The above scheme of the utility model comprises an oxygen preparation device, an ozone generator device, an ozone dosing device, at least one ozone reactor, a coagulation device, a flocculation device, and a sedimentation and clarification device which are connected in sequence; the ozone dosing device is connected to at least one ozone reactor through a water inlet pipe, at least one ozone reactor is provided with a catalyst dosing tank, a tail gas destruction device connected to at least one ozone reactor, a coagulant dosing tank connected to the coagulation device, and a flocculant dosing tank connected to the flocculation device; the sedimentation and clarification device is connected to the flocculation device through one end of a first pipeline, and the other end is connected to a magnetic powder recovery system to discharge the sludge. The technical solution of the utility model has a high ozone utilization rate in the ozone catalytic oxidation process, and pollutants can be degraded in the ozone stage; there is no subsequent activated carbon, and there is no need to consider whether the amount of ozone will affect the subsequent biological activated carbon; this system only has ozone catalyst backwashing, and no biological activated carbon backwashing, and the intensity of ozone catalyst backwashing has no effect on the degradation of pollutants; there is no need to regenerate or replace activated carbon regularly; compared with ordinary coagulation precipitation, the magnetic coagulation system adds magnetic powder as precipitation nucleus to make floccules easier to precipitate; the magnetic powder recovery system can recover the magnetic powder for repeated use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a diagram of a sewage treatment system integrating ozone catalytic oxidation and magnetic coagulation according to an embodiment of the utility model;

[0019] Figure 2 yes Figure 1 A schematic diagram of the structure A of the embodiment;

[0020] Figure 3 yes Figure 1 A schematic diagram of structure B in the embodiment;

[0021] Description of reference numerals:

[0022] 1. Oxygen preparation device; 2. Ozone generator device; 3. Ozone dosing device; 4. Ozone reactor; 5. Coagulation device; 6. Flocculation device; 7. Sedimentation and clarification device; 8. Water inlet pipe; 9. Catalyst dosing tank; 10. Tail gas destruction device; 11. Coagulant dosing tank; 12. Flocculant dosing tank; 13. First pipeline; 14. Magnetic powder recovery system; 15. Mechanical stirring device; 16. Sludge hopper; 17. Sludge scraping device; 18. Guide tube; 19. Inclined tube device. DETAILED DESCRIPTION

[0023] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0024] like Figures 1 to 3 As shown, the embodiment of the utility model proposes an ozone catalytic oxidation and magnetic coagulation integrated sewage treatment system, comprising an oxygen preparation device 1, an ozone generator device 2, an ozone dosing device 3, at least one ozone reactor 4, a coagulation device 5, a flocculation device 6, and a sedimentation and clarification device 7 connected in sequence;

[0025] It also includes a water inlet pipe 8 connected to the ozone dosing device 3 and the ozone reactor 4, at least one of the ozone reactors 4 is provided with a catalyst dosing tank 9, a tail gas destruction device 10 connected to at least one of the ozone reactors 4, a coagulant dosing tank 11 connected to the coagulation device 5, and a flocculant dosing tank 12 connected to the flocculation device 6. The sedimentation and clarification device 7 is connected to the flocculation device 6 at one end through a first pipeline 13, and the other end is connected to a magnetic powder recovery system 14 to discharge the sludge.

[0026] The technical solution of the utility model has a high ozone utilization rate in the ozone catalytic oxidation process, and pollutants can be degraded in the ozone stage without relying on the combination of ozone and biological activated carbon; there is no subsequent activated carbon, and there is no need to consider whether the amount of ozone will affect the subsequent biological activated carbon; this system only has ozone catalyst backwashing, no biological activated carbon backwashing, and the intensity of ozone catalyst backwashing has no effect on the degradation of pollutants (unlike biological activated carbon that will hang biofilm); because there is no activated carbon, there is no need to regenerate or replace activated carbon regularly; although there are still catalyst fillers, and there is also the problem that backwashing may increase effluent SS (suspended solids), there is subsequent magnetic coagulation as a guarantee; compared with ordinary coagulation precipitation, the magnetic coagulation system adds magnetic powder as precipitation nucleus, making it easier for floccules to settle down. The magnetic powder recovery system can recycle magnetic powder for repeated use.

[0027] In an optional embodiment of the present invention, the coagulation device 5 and the flocculation device 6 are both provided with a mechanical stirring device 15 .

[0028] In this embodiment, the coagulation device 5 and the flocculation device 6 are both provided with a mechanical stirring device 15. The mechanical stirring device 15 can be a vertical mixer, or other types of mixers can be selected as needed. The mixer can be fixed at the opening of the coagulation device 5 and the flocculation device 6 in a double crossbeam manner using angle steel or square steel. A motor is fixedly installed on the crossbeam, and a cable is installed on the motor to connect to an external power supply. A rotating shaft is connected to the coagulation device 5 and the flocculation device 6 at the lower part of the motor, and blades are installed at the end of the rotating shaft. The blades can be two, three, or single-layer or double-layer blades. A distance is preset between the mechanical stirring device 15 and the bottom of the coagulation device 5 and the flocculation device 6, and the distance can be set as needed to make the mixer stir more evenly. According to the different speeds required for coagulation and flocculation, different reducers are used to set the speed, and it can rotate after power is turned on. When in use, the stirring speed can be reasonably adjusted as needed to promote full mixing of the admixture and the incoming water, and full interaction between the admixture and the pollutant.

[0029] In an optional embodiment of the present invention, a sludge hopper 16 is provided at the bottom of the sedimentation and clarification device 7 .

[0030] In this embodiment, a sludge hopper 16 is provided at the bottom of the sedimentation and clarification device 7. The size of the sludge hopper 16 can be set as needed. The sludge hopper 16 is used to settle the sludge in the sedimentation and clarification device 7. At the same time, the lower part of the sludge hopper 16 is connected to a first pipeline 13 for recirculating and discharging the sludge.

[0031] In an optional embodiment of the present invention, a mud scraping device 17 is provided inside the sedimentation and clarification device 7 .

[0032] In this embodiment, a scraper device 17 is provided inside the sedimentation and clarification device 7. The scraper device 17 can be a central transmission scraper or other types of scrapers. It is fixed to the upper end of the sedimentation and clarification device 7 by using a double beam, and the motor is fixed to the middle part of the double beam. A cable is installed on the motor to connect to an external power supply. The lower part of the motor is connected to a rotating shaft. The rotation of the rotating shaft drives the scraper blades at the bottom of the sedimentation and clarification device 7 to rotate slowly. The motor is connected to electricity and uses a reducer with a suitable speed. It can start to rotate after power is turned on. The scraper device 17 can scrape the sludge hopper 16, and can also scrape the bottom of the sedimentation and clarification device 7. After the water containing flocs enters the sedimentation and clarification device 7, the flocs are settled to the bottom of the sedimentation and clarification device 7. A slowly rotating scraper is provided at the bottom to prevent the flocs from settling and compacting.

[0033] In an optional embodiment of the present invention, a guide tube 18 is provided in the flocculation device 6 .

[0034] In this embodiment, the guide tube 18 is a porous device, which is widely used in flocculation devices in sewage treatment. Its main function is to eliminate the vortex generated by the water body when the water flows through, and to mix the sewage with the flocculant to improve the purification efficiency of the sewage.

[0035] In the flocculation device, the sewage and flocculants are first filtered through the sludge and then enter the guide tube 18. The porous structure of the guide tube 18 allows the water to flow out naturally, and the water will continue to mix through the holes. In this way, the mixing effect of water and flocculants can be fully improved, resulting in a more efficient and deeper flocculation tank.

[0036] According to different sewage treatment equipment, the guide tube 18 can be divided into two types: upright and horizontal. Among them, the upright guide tube generally adopts a vertical cylinder shape, and its main function is to prevent the sewage from generating a rotating flow when flowing through, and to enable the water flow to flow from top to bottom. The horizontal guide tube adopts a square cylinder shape, and its main function is to block the bubbles in the sewage and effectively mix the flocculant and sewage. This system can select the appropriate type of guide tube 18 according to different flocculation devices.

[0037] In an optional embodiment of the present invention, an inclined tube device 19 is connected to the top of the sedimentation and clarification device 7 .

[0038] In this embodiment, an inclined tube device 19 is connected to the top of the sedimentation and clarification device 7. An inclined plate device or an inclined tube device can also be selected. The materials include polypropylene (PP), polyvinyl chloride (PVC) and glass fiber reinforced plastics (FRP). Different types can be selected according to needs. An inclined tube device 19 is arranged on the top of the sedimentation and clarification device 7 to facilitate the water separated from the flocs to be further precipitated in the inclined tube sedimentation area and then discharged.

[0039] In an optional embodiment of the present invention, the oxygen preparation device 1 is one of a pressure swing adsorption oxygen production equipment and a low-pressure adsorption vacuum desorption oxygen production equipment.

[0040] In this embodiment, the oxygen preparation device 1 is one of a pressure swing adsorption oxygen generator (PSA oxygen generator) and a low pressure adsorption vacuum desorption oxygen generator (VPSA oxygen generator). Liquid oxygen can also be used as a gas source for the ozone generator.

[0041] In an optional embodiment of the utility model, the ozone dosing device 3 is provided with a dosing device, and the dosing device is one of an aeration plate, a high-efficiency gas dissolving device, and an ejector.

[0042] In this embodiment, the ozone dosing device 3 is provided with a dosing device, which is one of an aeration plate, a high-efficiency dissolved air device, an ejector, and a dissolved air pump. Other types of dosing devices can also be selected as needed, the purpose of which is to mix ozone and the water to be treated.

[0043] The working principle of the utility model is as follows: oxygen is provided to the ozone generator device 2 through the oxygen preparation device 1, the ozone generator device 2 converts oxygen into ozone through high voltage discharge, and the ozone is transmitted to the ozone dosing device 3. The water inlet pipe 8 is connected to the ozone dosing device 3, which is used to transport the water to be treated to the ozone dosing device 3, the ozone dosing device 3 mixes the ozone and the water to be treated, and the mixed water in the ozone dosing device 3 is transmitted to at least one ozone reactor 4. A catalyst dosing tank 9 is arranged inside the ozone reactor 4, and the catalyst in the catalyst dosing tank is used to chemically react with the sewage in the ozone reactor 4 to achieve the purpose of degrading pollutants. The catalyst dosing tank 9 is equipped with a backwashing system, and the tail gas destruction device 10 is connected to at least one ozone reactor 4, which is used to collect and degrade the underutilized ozone in the ozone reactor 4 to prevent ozone from escaping into the air and polluting the air. The ozone reactor 4 is connected to the coagulation device 5, and is used to provide treated water (process water) to the coagulation device 5. The coagulation device 5 is provided with a coagulant dosing tank 11, and a coagulant (including magnetic powder) is added to the coagulation device 5 through the coagulant dosing tank 11. The function of the coagulant is mainly adsorption. Through the adsorption bridging effect, the particles in the water are bonded together, and the particles are fully fused through the mechanical stirring device 15. The coagulation device 5 is connected to the flocculation device 6. The process water of the coagulation device 5 after rapid stirring by the mechanical stirring device 15 flows into the flocculation device 6. The flocculant dosing tank 12 connected to the flocculation device 6 adds flocculant to the flocculation device 6 through the flocculant dosing tank 12. The flocculation device 6 is provided with a guide The flow tube 18 and the mechanical stirring device 15 allow the process water to fully react. The water containing flocs in the flocculation device 6 is transmitted to the sedimentation and clarification device 7. The flocs are precipitated to the bottom of the sedimentation and clarification device 7. The sludge scraper 17 stirs the flocs to prevent the flocs from settling and hardening. A sludge hopper 16 is provided at the bottom of the sedimentation and clarification device 7. The sludge hopper 16 is connected to the flocculation device 6 through one end of the first pipeline 13. A part of the sludge is returned to the flocculation device 6 as needed, and the other end is connected to the magnetic powder recovery system 14 to discharge the sludge. The magnetic powder in the sludge is recycled by the magnetic powder recovery system 14; the top of the sedimentation and clarification device 7 is connected to an inclined tube device 19, and the water separated from the flocs is further precipitated through the inclined tube device 19 before being discharged.

[0044] The above is a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A sewage treatment system integrating ozone catalytic oxidation and magnetic coagulation, characterized in that: It comprises an oxygen preparation device (1), an ozone generator device (2), an ozone dosing device (3), at least one ozone reactor (4), a coagulation device (5), a flocculation device (6), and a sedimentation and clarification device (7) which are connected in sequence; It also includes a water inlet pipe (8) connected to the ozone dosing device (3) and the ozone reactor (4), at least one of the ozone reactors (4) is provided with a catalyst dosing tank (9), a tail gas destruction device (10) connected to at least one of the ozone reactors (4), a coagulant dosing tank (11) connected to the coagulation device (5), and a flocculant dosing tank (12) connected to the flocculation device (6); the sedimentation and clarification device (7) is connected to the flocculation device (6) at one end through a first pipeline (13), and the other end is connected to a magnetic powder recovery system (14) to discharge the sludge.

2. The sewage treatment system integrating ozone catalytic oxidation and magnetic coagulation according to claim 1 is characterized in that: The coagulation device (5) and the flocculation device (6) are both provided with a mechanical stirring device (15).

3. The sewage treatment system integrating ozone catalytic oxidation and magnetic coagulation according to claim 1 is characterized in that: A sludge hopper (16) is provided at the bottom of the sedimentation and clarification device (7).

4. The sewage treatment system integrating ozone catalytic oxidation and magnetic coagulation according to claim 3 is characterized in that: A mud scraping device (17) is arranged inside the sedimentation and clarification device (7).

5. The sewage treatment system integrating ozone catalytic oxidation and magnetic coagulation according to claim 1 is characterized in that: The flocculation device (6) is provided with a flow guide tube (18).

6. The sewage treatment system integrating ozone catalytic oxidation and magnetic coagulation according to claim 1 is characterized in that: The top of the sedimentation and clarification device (7) is connected to an inclined tube device (19).

7. The sewage treatment system integrating ozone catalytic oxidation and magnetic coagulation according to claim 1 is characterized in that: The oxygen preparation device (1) is one of a pressure swing adsorption oxygen production device and a low-pressure adsorption vacuum desorption oxygen production device.

8. The sewage treatment system integrating ozone catalytic oxidation and magnetic coagulation according to claim 1 is characterized in that: The ozone dosing device (3) is provided with a dosing device, and the dosing device is one of an aeration plate, a high-efficiency gas dissolving device, and an ejector.

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