System and method for treating coexisting new pollutants in drinking water

Abstract

The invention provides a system and a method for treating coexisting new pollutants in drinking water, and the system and the method are characterized in that firstly, ozone microbubble water with small volume and large specific surface area and magnetized superfine activated carbon are used for carrying out oxidation treatment on the coexisting new pollutants and adsorbing pollutants with small molecular weight and relatively high activity; the purpose of removing part of new pollutants is achieved; then, under the irradiation of an ultraviolet lamp tube, the reducing agent catalyzes sulfite to generate reducing free radicals such as hydration electrons [eaq-],. H and SO3., and under the substitution action of iodide ions, reductive dehalogenation and iodine substitution reaction of the halogenated organic matter difficult to degrade are achieved, and reduction removal of new pollutants difficult to degrade is achieved. The system is simple and compact in structure, is a treatment device integrating filtration, oxidation, adsorption and reduction, reduces the occupied area, can realize effective removal of coexisting new pollutants with different molecular characteristics and different reaction activities through multiple actions of physical interception, oxidation, adsorption, reduction and the like, and has a wide application prospect.

Description

Technical Field

[0001] The invention belongs to the technical field of water pollution treatment, and relates to a system and method for treating new coexisting pollutants in drinking water. Background Art

[0002] New pollutants refer to toxic and hazardous chemical substances that are discharged into the environment, have characteristics such as biological toxicity, environmental persistence, and bioaccumulation, and pose great risks to the ecological environment or human health, but have not yet been included in management or the existing management measures are insufficient.

[0003] New pollutants mainly include perfluorinated compounds, endocrine disruptors, antibiotics, etc., which are controlled by international conventions. The production and use of toxic and harmful chemicals are the main sources of new pollutants. At present, a variety of new pollutants have been detected in different water bodies in my country and other countries and regions, and multiple pollutants usually coexist in the same water body.

[0004] The commonly used methods for water treatment include coagulation and sedimentation, sand filtration, ozone-activated carbon, nanofiltration, etc. However, the widely used traditional water treatment processes such as coagulation and sedimentation, sand filtration, etc. have limited removal efficiency for new pollutants. Although deep treatment processes such as ozone-activated carbon and nanofiltration have certain removal effects on some new pollutants, they cannot effectively deal with difficult-to-degrade halogenated new pollutants such as perfluorinated compounds and brominated flame retardants. In addition, the ozone oxidation process currently has the disadvantages of high oxidant dosage, low ozone mass transfer and utilization rate, and low oxidation free radical generation, which restricts its degradation efficiency for new pollutants. At the same time, the activated carbon used in the ozone-activated carbon treatment process also has the problem of limited adsorption capacity and ozone catalytic ability. Summary of the invention

[0005] The object of the present invention is to provide a system and method for treating new co-existing pollutants in drinking water, so as to solve the problem that existing treatment methods cannot effectively treat new co-existing pollutants in drinking water.

[0006] To achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present application provides a method for treating new coexisting pollutants in drinking water, the method comprising: S01: The ozone generated by the ozone generator is foamed by the microbubble generator to form ozone microbubble water.

[0007] After water is added to the ozone generator, ozone is generated and passed into the microbubble generator. The microbubble generator performs a foaming treatment on the received ozone-containing water to form ozone microbubble water.

[0008] S02: Drinking water containing coexisting new pollutants is mixed with magnetized ultrafine activated carbon to form a blend.

[0009] The magnetized ultrafine activated carbon inside the magnetized ultrafine activated carbon storage tank is mixed with drinking water containing coexisting new pollutants through a pipeline mixer to form a blend.

[0010] In the present application, the preparation method of magnetized ultrafine activated carbon comprises: S021: Place coconut shell activated carbon, iron oxide particles and manganese dioxide particles in a planetary ball mill and grind for 4-12 hours to obtain a mixed powder with a particle size of 0.2-10 μm.

[0011] Coconut shell activated carbon with a particle size greater than 0.1 mm, iron oxide particles, and manganese dioxide particles are weighed according to mass fractions of 70-90%, 0-30%, and 0-30%, and then put into a planetary ball mill and grind for 4-12 hours to obtain a mixed powder with an average particle size of 0.2-10 μm.

[0012] S022: In a nitrogen atmosphere, the mixed powder is pyrolyzed at 300-600°C for 1-6 hours to solidify the metal elements on the side wall of the coconut shell activated carbon to obtain magnetized ultrafine activated carbon.

[0013] S03: The ozone microbubble water is added to the blend, and the magnetized ultrafine activated carbon is placed in a fluidized state.

[0014] The blend is introduced into the ozone oxidation zone in the redox device, and at the same time, ozone microbubble water is introduced into the ozone oxidation zone, and the magnetized ultrafine activated carbon is placed in a fluidized state.

[0015] S04: The ozone microbubble water and the magnetized ultrafine activated carbon adsorb and oxidize the coexisting new pollutants to obtain primary treated water.

[0016] Ozone microbubble water and magnetized ultrafine activated carbon can non-selectively oxidize / adsorb pollutants with small molecular weight and relatively high activity, such as antibiotics, endocrine disruptors, etc. At the same time, magnetized ultrafine activated carbon with transition metal catalysis and carbon chain defect structure sites can also efficiently catalyze the generation of ozone in ozone microbubble water. 2 · Iso-oxidative free radicals significantly improve the ozone oxidation efficiency and obtain primary treated water.

[0017] S05: Under the irradiation of ultraviolet light, the primary treated water from which the magnetized ultrafine activated carbon is filtered out is reduced using a reducing agent and iodine ions to obtain treated water.

[0018] After the primary treated water passes through the granular activated carbon in the activated carbon net to filter out the unreacted magnetized ultrafine activated carbon, the reducing agent catalyzes the sulfite to generate hydrated electrons [e a q - ],·H and SO 3· etc. reducing free radicals, and under the substitution effect of iodine ions, the reduction dehalogenation and iodine substitution reaction of the difficult-to-degrade halogenated organic matter is realized, and the reduction removal of the difficult-to-degrade new pollutants is realized to obtain treated water.

[0019] In the present application, the reducing agent includes: sodium sulfite, sodium dithionite, potassium iodide.

[0020] In the second aspect, based on the method for treating new co-existing pollutants in drinking water in the first aspect, the present application also provides a system for treating new co-existing pollutants in drinking water, the system comprising an ozone generator, a microbubble generator, a redox device and a water outlet pool connected in series, wherein: Two activated carbon nets isolate the interior of the redox device into an ultraviolet reaction zone and ozone oxidation zones symmetrically arranged on both sides of the ultraviolet reaction zone; The two ozone oxidation zones are respectively connected to the magnetized ultrafine activated carbon storage tank and the microbubble generator; The side wall of the activated carbon net inside the ultraviolet reaction zone is provided with ultraviolet lamps with wavelengths of 222nm, 245nm, 255nm, 265nm, 275nm and 365nm; The top of the ultraviolet reaction zone is also connected to a reagent dosing pump.

[0021] Preferably, a partition is provided in the ozone oxidation zone, a magnetic separation plate is provided between the partition adjacent to the ultraviolet reaction zone and the activated carbon net, and an end of the magnetic separation plate is detachably arranged on the top of the ozone oxidation zone.

[0022] Preferably, the angle between the magnetic separation plate and the activated carbon mesh is 30-60°.

[0023] Preferably, a VUV lamp tube is further provided on the top of the ultraviolet reaction zone, and granular activated carbon is provided in the activated carbon net.

[0024] Preferably, the redox device is connected to the microbubble generator via a reflux pipe.

[0025] Preferably, the ultraviolet reaction zone is connected to the water outlet pool via a water suction pump and a water outlet pipe, and the water outlet pool is also connected to the microbubble generator.

[0026] The present invention has the following beneficial effects: (1) Ozone microbubble water and magnetized ultrafine activated carbon both have the characteristics of small volume and large specific surface area. Therefore, magnetized ultrafine activated carbon with transition metal catalysis and carbon chain defect structure sites can physically adsorb pollutants with small molecular weight and relatively high activity, such as antibiotics and endocrine disruptors. At the same time, it can also efficiently catalyze the generation of ozone in ozone microbubble water to OH and O 2·Iso-oxidative free radicals can be generated to improve the ozone oxidation rate and the non-selective oxidation capacity of the reaction system, and finally the new pollutants in the coexisting new pollutants can be degraded.

[0027] (2) Ozone microbubbles can achieve in-situ regeneration of ultrafine powdered carbon, extending the service life and adsorption stability of activated carbon.

[0028] (3) The setting of the partition in the ozone oxidation zone can make the flow of the coexisting new pollutants in the ozone oxidation zone form an "S"-shaped up and down flow, prolonging the residence contact time of the ozone microbubble water, magnetized ultrafine activated carbon and the coexisting new pollutants in the ozone oxidation zone, increasing the collision reaction probability of the ozone microbubble water and the magnetized ultrafine activated carbon, and maximizing the oxidation efficiency and ozone utilization rate; at the same time, it can effectively adsorb pollutants that are difficult to oxidize, and simultaneously realize the ultrafine oxidation degradation and adsorption of new pollutants.

[0029] (4) The arrangement of the magnetic separation plate in the ozone oxidation zone can adsorb the magnetized ultrafine activated carbon that flows to the vicinity and effectively recover the magnetized ultrafine activated carbon.

[0030] (5) The ultraviolet reaction zone is equipped with a low-pressure high-intensity UV lamp and a multi-band UV-LED lamp tube. Under the irradiation of the ultraviolet lamp tube, the reducing agent catalyzes the sulfite to generate hydrated electrons [e a q - ],·H and SO 3 · It can produce reducing free radicals such as iodine ions, and realize the reduction dehalogenation and iodine substitution reaction of difficult-to-degrade halogenated organic matter under the substitution effect of iodine ions, and realize the reduction removal of difficult-to-degrade new pollutants.

[0031] (6) The ultraviolet reaction zone is equipped with a low-pressure, high-intensity UV lamp and a multi-band UV-LED lamp tube, which can flexibly adjust the UV advanced reduction reaction wavelength based on the raw water matrix background and target pollutants, thereby improving the system applicability and reducing the system energy consumption.

[0032] (7) The system has a simple and compact structure and is a treatment device that integrates filtration, oxidation, adsorption and reduction, which reduces the footprint. Through physical interception, oxidation, adsorption and reduction, it can effectively remove new pollutants with different molecular characteristics and different reaction activities, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the structure of a system for treating new coexisting pollutants in drinking water provided in an embodiment of the present application; Figure 2 The concentration of coexisting new pollutants in the inlet and outlet water during the overall simulation experiment provided in the embodiment of the present application; Figure 3The concentration of new pollutants coexisting in the inlet and outlet water during the single ozone oxidation experiment, the single magnetized ultrafine activated carbon experiment, and the ozone oxidation + magnetized ultrafine activated carbon experiment provided in the embodiments of the present application; Symbols represent: 1-ozone generator, 2-micro bubble generator, 3-oxidation-reduction device, 4-water outlet pool, 5-activated carbon net, 6-magnetized ultrafine activated carbon storage tank, 7-ultraviolet lamp, 8-agent dosing pump, 9-partition, 10-magnetic separation plate, 11-VUV lamp tube, 12-granular activated carbon, 13-reflux pipe, 14-water suction pump, 15-water outlet pipe, 16-bubble water inlet pipe, 17-magnetized ultrafine activated carbon, 18-pipeline mixer, 19-drain pipe, 20-treated water drain pipe; 301-ultraviolet reaction zone, 302-ozone oxidation zone. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is further explained and illustrated by means of specific embodiments below.

[0035] The present application provides a method for treating new contaminants coexisting in drinking water by using a multi-stage process of oxidation-adsorption-advanced reduction in series, the method comprising: S101: After water is added to the ozone generator, ozone is generated and passed into the microbubble generator. The microbubble generator performs a foaming process on the received ozone-containing water to form ozone microbubble water.

[0036] S102: The magnetized ultrafine activated carbon in the magnetized ultrafine activated carbon storage tank is mixed with the coexisting new pollutants through a pipeline mixer to form a blend. The preparation method of the magnetized ultrafine activated carbon includes: weighing coconut shell activated carbon with a particle size greater than 0.1 mm, iron oxide particles, and manganese dioxide particles according to mass fractions of 75%, 15%, and 10%, and grinding them in a planetary ball mill for 10 hours to obtain a mixed powder with an average particle size of 0.5 μm; in a nitrogen atmosphere, the mixed powder is pyrolyzed at 500°C for 5 hours to obtain the magnetized ultrafine activated carbon.

[0037] S103: introducing the blend into the ozone oxidation zone in the redox device, and simultaneously introducing ozone microbubble water into the ozone oxidation zone, and placing the magnetized ultrafine activated carbon in a fluidized state.

[0038] S104: The ozone microbubble water and the magnetized ultrafine activated carbon adsorb and oxidize the coexisting new pollutants to remove pollutants with smaller molecular weight and relatively higher activity, thereby obtaining primary treated water.

[0039] S105: Under the irradiation of ultraviolet light, a reducing agent is used to catalyze sulfite to generate hydrated electrons [e a q -],·H and SO 3 · etc. reducing free radicals, and under the substitution effect of iodine ions, the reduction dehalogenation and iodine substitution reaction of the difficult-to-degrade halogenated organic matter is realized, and the reduction removal of the difficult-to-degrade new pollutants is realized to obtain treated water.

[0040] Based on the above method for treating new co-existing pollutants in drinking water provided in the embodiment of the present application, the embodiment of the present application also provides a system for treating new co-existing pollutants in drinking water, the system comprising an ozone generator 1, a microbubble generator 2, a redox device 3 and a water outlet pool 4 connected in series, the system also comprising a magnetized ultrafine activated carbon storage tank 6, a pipeline mixer 18, etc., as shown in the attached Figure 1 shown.

[0041] Specifically, the ozone generator 1 is a component for generating ozone, which generates ozone by adding pure water, and passes the ozone-generated water into the microbubble generator 2. The microbubble generator 2 performs a foaming process on the received water containing ozone to form ozone microbubble water. After the ozone microbubble water is transported to the redox device 3 through the bubble water inlet pipe 16, it is transported to multiple areas in the redox device 3 through multiple branch pipes.

[0042] The magnetized ultrafine activated carbon storage tank 6 is a component for storing the magnetized ultrafine activated carbon 17. The magnetized ultrafine activated carbon 17 in the magnetized ultrafine activated carbon storage tank 6 is mixed with the coexisting new pollutants through the pipeline mixer 18 and then enters the ozone oxidation zone 302.

[0043] The redox device 3 is a device for oxidizing and reducing coexisting new pollutants. In the embodiment of the present application, two activated carbon nets 5 isolate the interior of the redox device 3 into an ultraviolet reaction zone 301 and an ozone oxidation zone 302 symmetrically arranged on both sides of the ultraviolet reaction zone 301. Among them, the two ozone oxidation zones 302 are respectively connected to the magnetized ultrafine activated carbon storage tank 6 and the microbubble generator 2, so that the magnetized ultrafine activated carbon 17 stored in the magnetized ultrafine activated carbon storage tank 6 and the ozone microbubble water generated by the microbubble generator 2 enter the two ozone oxidation zones 302 to achieve oxidation treatment of coexisting new pollutants.

[0044] Specifically, after the mixture formed by the magnetized ultrafine activated carbon 17 and the coexisting new pollutants enters the ozone oxidation zone 302, the ozone microbubble water is transported from the bottom of the ozone oxidation zone 302 to the ozone oxidation zone 302 through the bubble water inlet pipe 16, and the magnetized ultrafine activated carbon 17 is in a fluidized state. Since both the magnetized ultrafine activated carbon 17 and the ozone microbubble water have the characteristics of small volume and large specific surface area, the magnetized ultrafine activated carbon 17 with transition metal catalysis and carbon chain defect structure sites can physically adsorb pollutants with small molecular weight and relatively high activity, such as antibiotics, endocrine disruptors, etc. At the same time, it can also efficiently catalyze the ozone in the ozone microbubble water to generate OH, O2 ·Iso-oxidative free radicals can be generated to improve the ozone oxidation rate and the non-selective oxidation capacity of the reaction system, and finally the new pollutants in the coexisting new pollutants can be degraded.

[0045] In the embodiment of the present application, a partition 9 is provided in the ozone oxidation zone 302, which isolates the ozone oxidation zone 302 into multiple spaces and makes the flow of the coexisting new pollutants in the ozone oxidation zone 302 form an "S"-shaped up and down flow, thereby extending the residence contact time of the ozone microbubble water, the magnetized ultrafine activated carbon 17 and the coexisting new pollutants in the ozone oxidation zone 302, and increasing the collision reaction probability of the ozone microbubble water and the magnetized ultrafine activated carbon 17, thereby maximizing the oxidation efficiency and ozone utilization rate; at the same time, it effectively adsorbs pollutants that are difficult to oxidize, and simultaneously realizes the ultrafine oxidation degradation and adsorption of new pollutants.

[0046] Preferably, two partitions 9 are provided in the ozone oxidation zone 302, and the ozone oxidation zone 302 is isolated into three spaces ①②③, and the mixture formed by the magnetized ultrafine activated carbon 17 and the coexisting new pollutants forms an "S"-shaped up and down flow in the spaces ①②③. In addition, the ozone microbubble water is also introduced into the three spaces ①②③ through three branch pipes, so that the catalytic oxidation process exists in the ozone oxidation zone 302.

[0047] In order to realize the recycling of the magnetized ultrafine activated carbon 17, a magnetic separation plate 10 is provided between the partition plate 9 adjacent to the ultraviolet reaction zone 301 and the activated carbon net 5, that is, a magnetic separation plate 10 is provided in the space ③. The magnetic separation plate 10 can adsorb the magnetized ultrafine activated carbon 17 flowing to the vicinity, and effectively recycle the magnetized ultrafine activated carbon 17.

[0048] In order to facilitate the removal of the magnetic separation plate 10 that adsorbs the magnetized ultrafine activated carbon 17, the end of the magnetic separation plate 10 in the embodiment of the present application is detachably arranged on the top of the ozone oxidation zone 302 to facilitate the removal of the magnetic separation plate 10 from the ozone oxidation zone 302.

[0049] Furthermore, in order to prevent the magnetic separation plate 10 from disturbing the flow of the magnetized ultrafine activated carbon 17 in the ozone oxidation zone 302 while facilitating the adsorption of the magnetized ultrafine activated carbon 17, the angle between the magnetic separation plate 10 and the activated carbon net 5 is preferably set to 30-60°.

[0050] In the embodiment of the present application, the activated carbon net 5 is provided with granular activated carbon 12 inside, which can filter out the unadsorbed magnetized ultrafine activated carbon 17, and can further adsorb the remaining new pollutants. Therefore, after the coexisting new pollutants are treated in the ozone oxidation zone 302, they are filtered through the granular activated carbon 12 inside the activated carbon net 5 and enter the ultraviolet reaction zone 301. In addition, the surface of the activated carbon net 5 can also be cleaned with ozone microbubble water, which is less damaging to the activated carbon net 5 than cleaning with chemical reagents.

[0051] In the ultraviolet reaction zone 301, an ultraviolet lamp 7 is provided on the side wall of the activated carbon net 5, and the wavelength of the ultraviolet lamp 7 is 222nm, 245nm, 255nm, 265nm, 275nm and 365nm. The ultraviolet lamp 7 of the appropriate wavelength can be selected based on the different pollutants in the coexisting new pollutants, so as to achieve high reaction energy density while taking into account the penetration of ultraviolet light in the reactor, which is more suitable for efficient removal of halogenated organic matter with different characteristics. Furthermore, a VUV lamp tube 11 is also provided in a matrix at the top of the ultraviolet reaction zone 301.

[0052] In addition, the top of the ultraviolet reaction zone 301 is also connected to a reagent dosing pump 8, through which the reducing agent and iodine ions can be added to the ultraviolet reaction zone 301. Under the irradiation of the ultraviolet lamp 7 and the VUV lamp tube 11, the reducing agent catalyzes the sulfite to generate hydrated electrons [e a q - ],·H and SO 3 · etc. reducing free radicals, and under the substitution effect of iodine ions, the reduction dehalogenation and iodine substitution reaction of the difficult-to-degrade halogenated organic matter is realized, and the reduction removal of the difficult-to-degrade new pollutants is realized to obtain treated water.

[0053] The treated water from which the refractory halogenated organic matter is removed in the ultraviolet reaction zone 301 is connected to the outlet pool 4 through the water suction pump 14 and the outlet pipe 15 to realize the storage of the treated water. Further, the treated water from which the refractory halogenated organic matter is removed in the ultraviolet reaction zone 301 can also re-enter the ozone oxidation zone 302 to further remove the refractory halogenated organic matter. In the embodiment of the present application, in order to realize the recycling of the treated water, the outlet pool 4 is also connected to the microbubble generator 2 to form ozone microbubble water.

[0054] In addition, the unreacted ozone in the ozone oxidation zone 302 flows back to the microbubble generator 2 through the reflux pipe 13 to achieve reuse and avoid waste.

[0055] In the embodiment of the present application, a drain pipe 19 is further provided at the bottom of the ozone oxidation zone 302, and a treated water drain pipe 20 is further provided at the bottom of the ultraviolet reaction zone 301, so as to discharge the untreated coexisting new pollutants at the end.

[0056] The symmetrical arrangement of water inlet on both sides and water outlet in the present application can achieve simultaneous water inlet, improve treatment efficiency and reduce floor space; in addition, water inlet on both sides can also balance the water flow distribution of the water outlet pool 4, avoiding dead water areas caused by uneven water flow pressure in the ozone oxidation zone 302; at the same time, it can also make the magnetized ultrafine activated carbon 17 better in a fluidized state.

[0057] In order to verify that the system for treating coexisting new pollutants in drinking water provided in the embodiment of the present application has a high treatment energy efficiency, four types of coexisting pollutants were selected in the embodiment of the present application and configured in actual surface water, and a simulation experiment was carried out according to the system and method in the embodiment of the present application, wherein the simulation experiment conditions are: the actual surface water is the raw water of the Huangshui Reservoir, and the TOC value is 2.4 mg / L; the four types of coexisting pollutants and their initial concentrations are: 200 ng / L perfluorooctanoic acid, 200 ng / L sulfadiazine, 200 ng / L bisphenol A and 200 ng / L atrazine; the experimental conditions are: 3 Dosage: 2 mg / L, magnetic ultrafine powdered carbon dosage: 15 mg / L, UV dose: 600 mJ / cm 2 , sodium sulfite dosage is 20 mg / L, and iodide ion concentration is 500 μg / L.

[0058] After a simulation experiment was conducted according to the system and method provided in the embodiment of the present application, the concentrations of the inlet water, the outlet water of the ozone oxidation zone, and the outlet water of the ultraviolet reaction zone were calculated respectively, and the attached Figure 2 In addition, the present invention also conducted single ozone oxidation experiment, single magnetized ultrafine activated carbon experiment and ozone oxidation + magnetized ultrafine activated carbon experiment, and calculated the effluent concentration in each experiment to obtain the attached Figure 3 , among which, the dosage of magnetized ultrafine activated carbon is 15 mg / L.

[0059] By the attached Figure 2 It can be seen that compared with the influent, after the magnetized ultrafine activated carbon catalyzed ozone oxidation reaction, the concentrations of perfluorooctanoic acid, sulfadiazine, bisphenol A and atrazine in the effluent of the ozone oxidation zone were 105.3 ng / L, 12.6 ng / L, 24.3 ng / L and 17.8 ng / L, respectively, which were 47.35%, 93.70%, 87.85% and 91.10% lower than the influent concentrations, respectively. It can be seen that the ozone oxidation zone has a high removal effect on all types of pollutants except perfluorooctanoic acid. Since perfluorinated compounds cannot be effectively removed by oxidation reaction, the removal of perfluorooctanoic acid in the ozone oxidation zone mainly depends on the adsorption of magnetic ultrafine powdered activated carbon.

[0060] After granular activated carbon adsorption and ultraviolet advanced reduction reaction, the concentrations of perfluorooctanoic acid, sulfadiazine, bisphenol A and atrazine in the effluent of the ultraviolet reaction zone were reduced to 8.9 ng / L, 5.8 ng / L, 3.1 ng / L and 5.7 ng / L, respectively. The overall removal rate of the coexisting new pollutants in actual surface water by the system and method provided in the embodiment of the present application reached 97.06%, which shows that the method can effectively purify the coexisting new pollutants contained in water and is less affected by the background matrix.

[0061] By the attached Figure 3 It can be seen that when the ozone oxidation experiment was carried out alone, the concentrations of perfluorooctanoic acid, sulfadiazine, bisphenol A and atrazine in the effluent were 193.6 ng / L, 74.7 ng / L, 94.7 ng / L and 73.2 ng / L, respectively; relative to the influent concentrations, the removal rates were 3.2%, 62.65%, 52.65% and 63.4%, respectively.

[0062] When the magnetized ultrafine activated carbon experiment was carried out alone, the removal rates of perfluorooctanoic acid, sulfadiazine, bisphenol A and atrazine were 36.10%, 93.70%, 87.85% and 91.10%, respectively.

[0063] When the ozone oxidation + magnetized ultrafine activated carbon experiment was carried out simultaneously, the removal rates of perfluorooctanoic acid, sulfadiazine, bisphenol A and atrazine were 47.35%, 93.70%, 87.85% and 91.10%, respectively. This shows that the addition of magnetized ultrafine activated carbon helps to improve the overall operating efficiency of the reaction system and achieves the effect of "1+1>2".

[0064] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for treating new coexisting pollutants in drinking water, characterized in that: include: The ozone generated by the ozone generator is foamed by the micro-bubble generator to form ozone micro-bubble water; Drinking water containing coexisting new pollutants is mixed with magnetized ultrafine activated carbon to form a blend; The ozone microbubble water is added to the blend, and the magnetized ultrafine activated carbon is in a fluidized state; The ozone microbubble water and the magnetized ultrafine activated carbon adsorb and oxidize the coexisting new pollutants to obtain primary treated water; Under the irradiation of ultraviolet light, the primary treated water from which the magnetized ultrafine activated carbon has been filtered out is reduced using a reducing agent and iodine ions to obtain treated water.

2. The method for treating coexisting new pollutants in drinking water according to claim 1, characterized in that: The preparation method of the magnetized ultrafine activated carbon comprises: The coconut shell activated carbon, iron oxide particles and manganese dioxide particles are placed in a planetary ball mill and ground for 4-12 hours to obtain a mixed powder with a particle size of 0.2-10 μm; Under a nitrogen atmosphere, the mixed powder is pyrolyzed at 300-600° C. for 1-6 h to obtain magnetized ultrafine activated carbon.

3. The method for treating coexisting new pollutants in drinking water according to claim 2, characterized in that: The mass fractions of the coconut shell activated carbon, the iron oxide particles, and the manganese dioxide particles are 70-90%, 0-30%, and 0-30%, respectively.

4. The method for treating coexisting new pollutants in drinking water according to claim 1, characterized in that: The reducing agent includes sodium sulfite, sodium dithionite and potassium iodide.

5. A system for treating new coexisting pollutants in drinking water, characterized in that: The method according to any one of claims 1 to 4 is used to treat new contaminants coexisting in drinking water, wherein the system comprises an ozone generator (1), a microbubble generator (2), a redox device (3) and a water outlet pool (4) connected in series, wherein: Two activated carbon nets (5) isolate the interior of the redox device (3) into an ultraviolet reaction zone (301) and an ozone oxidation zone (302) symmetrically arranged on both sides of the ultraviolet reaction zone (301); The two ozone oxidation zones (302) are respectively connected to the magnetized ultrafine activated carbon storage tank (6) and the microbubble generator (2); The side wall of the activated carbon net (5) inside the ultraviolet reaction zone (301) is provided with ultraviolet lamps (7) with wavelengths of 222nm, 245nm, 255nm, 265nm, 275nm and 365nm; The top of the ultraviolet reaction zone (301) is also connected to a reagent dosing pump (8).

6. The system for treating coexisting new pollutants in drinking water according to claim 5, characterized in that: A partition (9) is provided in the ozone oxidation zone (302), a magnetic separation plate (10) is provided between the partition (9) adjacent to the ultraviolet reaction zone (301) and the activated carbon net (5), and an end of the magnetic separation plate (10) is detachably arranged on the top of the ozone oxidation zone (302).

7. The system for treating coexisting new pollutants in drinking water according to claim 6, characterized in that: The angle between the magnetic separation plate (10) and the activated carbon net (5) is 30-60°.

8. The system for treating coexisting new pollutants in drinking water according to claim 5, characterized in that: A VUV lamp tube (11) is also provided on the top of the ultraviolet reaction zone (301), and granular activated carbon (12) is provided in the activated carbon net (5).

9. The system for treating coexisting new pollutants in drinking water according to claim 5, characterized in that: The redox device (3) is connected to the microbubble generator (2) via a reflux pipe (13).

10. The system for treating coexisting new pollutants in drinking water according to claim 5, characterized in that: The ultraviolet reaction area (301) is connected to the water outlet pool (4) via a water suction pump (14) and a water outlet pipe (15), and the water outlet pool (4) is also connected to the microbubble generator (2).

Images