Device and method for removing odorous micropollutants based on nanobubble technology

Abstract

The invention provides a device and method for removing odorous micropollutants based on the nanobubble technology, and belongs to the technical field of polluted water treatment.The device for removing odorous micropollutants based on the nanobubble technology comprises nanobubble generating equipment and foam separating equipment, a water inlet pipeline and an air inlet pipeline which are fixedly connected and communicated with the interior of the nanobubble generating equipment are arranged on the left side of the nanobubble generating equipment, an air pump is connected to the air inlet pipeline, and a nanobubble water outlet pipeline which is fixedly connected and communicated with the interior of the nanobubble generating equipment and the left side of the foam separating equipment are jointly arranged on the right side of the nanobubble generating equipment and the left side of the foam separating equipment; the method comprises the following steps: preparing a raw water solution of simulated sewage, adding a surfactant into the raw water solution, adjusting reaction conditions, treating the prepared raw water solution through the device, observing the foam volume, determining the most appropriate concentration of the surfactant and the like. The method is used for solving the problem that an existing method for removing odor-causing pollutants is too high in cost or too low in efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of polluted water treatment, and in particular, relates to a device and method for removing odor-causing micro-pollutants based on nanobubble technology. Background Art

[0002] Due to the dual impacts of climate change and environmental pollution, the frequency of harmful algal blooms (HAB) events is increasing. In addition to water quality problems caused by cyanobacteria and their toxins, HABs also cause long-term odor and taste problems through the metabolites produced by certain cyanobacteria.

[0003] Geosmin and Skatole are common odorous compounds in surface water. Geosmin has a distinct earthy smell and is usually produced by the metabolism of large-scale reproduction of cyanobacteria, while skatole is an organic compound produced by the metabolism of tryptophan and has a typical fecal odor. It is commonly found in water bodies when organic matter such as animal and plant remains decompose under the action of microorganisms. Even if the concentrations of these compounds are extremely low (ng / L level), they can cause earthy or foul odors, which in turn make the water produce an unpleasant odor and affect the drinkability of the water. In addition, some contaminated water sources may also affect the flavor and quality of processed foods and beverages.

[0004] Traditional water treatment technologies, such as coagulation, flocculation and activated carbon adsorption, are widely used to remove various water pollutants. However, the molecular size of odorous compounds is smaller than that of colloids and common dissolved organic matter, resulting in limited efficiency of these methods in removing odorous substances. Advanced oxidation processes (AOPs), such as UV / chlorine, ozonation, UV / photocatalysts, etc., have been widely studied in decentralized and small-scale water treatment facilities and used to remove odorous compounds. However, AOP technology is usually accompanied by higher operating costs.

[0005] Therefore, there is an urgent need to develop an effective and low-cost method to remove odor-causing pollutants to reduce their negative impacts on human health and the environment. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a device and method for removing odor-causing micro-pollutants based on nanobubble technology in view of the deficiencies in the above-mentioned prior art.

[0007] The present invention is achieved in that: The present invention provides a device for removing odor-causing micro-pollutants based on nanobubble technology, wherein the device comprises a nanobubble generating device and a foam separation device, wherein a water inlet pipeline and an air inlet pipeline fixedly connected and connected to the inside of the nanobubble generating device are provided on the left side of the nanobubble generating device, an air pump is connected to the air inlet pipeline, and a nanobubble water outlet pipeline fixedly connected and connected to the inside of the nanobubble generating device and the left side of the foam separation device are provided on the right side of the nanobubble generating device and the left side of the foam separation device; The upper right part of the foam separation device is provided with one end of an upper pipeline fixedly connected and communicated with the interior thereof, the other end of the upper pipeline extends into the foam collection device, and the upper pipeline is connected with a negative pressure pump; The lower right part of the foam separation device is provided with one end of a lower pipe which is fixedly connected and communicated with the inside thereof, and the other end of the lower pipe extends into the water outlet collection device.

[0008] The technical effects of the device for removing odor-causing micro-pollutants based on nanobubble technology provided by the present invention are as follows: On the basis of the above technical solution, the device and method for removing odor-causing micro-pollutants based on nanobubble technology of the present invention can also be improved as follows: Furthermore, the lower pipeline is movably connected to the water collection device, and one end of a drainage pipe fixedly connected and communicated with the interior of the water collection device is provided on the right side of the water collection device, and the other end of the drainage pipe is connected to the water treatment tail device.

[0009] The present invention provides a method for removing odor-causing micro-pollutants based on nanobubble technology, which comprises the following steps: S1: Prepare the raw aqueous solution of simulated sewage; S2: adding surfactant to the original aqueous solution and adjusting the reaction conditions; S3: treating the prepared raw aqueous solution through the device; S4: Observe the foam volume and determine the most appropriate surfactant concentration and reaction conditions based on the foam morphology.

[0010] Further, step S1 includes the following steps: S11: Prepare a stock solution (10 mg / L) by dissolving 5 mL of Geosmin and 0.4 mg of Skatole in 40 mL of deionized water, respectively. S12: The two stock solutions were diluted separately to prepare simulated polluted original aqueous solutions, and the concentrations of the pollutants Geosmin and Skatole in the simulated polluted original aqueous solutions were both 100 μg / L.

[0011] Further, step S2 comprises the following steps: S21: according to step S1, the original aqueous solution is obtained, different surfactant components and concentrations are added, and different reaction adjustments are adjusted, so as to perform comparative processing on the original aqueous solution through the control variable method.

[0012] Further, step S3 includes the following steps: S31: The adjusted raw water solution obtained in step S2 enters the nano bubble generating device through the water inlet pipeline; S32: providing gas with a set pressure into the nano bubble generating device through an air inlet pipeline and an air pump; S33: the gas and the original aqueous solution are mixed in the nano bubble generating device, so that nano bubbles are formed in the original aqueous solution; S34: The raw water solution mixed with nanobubbles is input into the foam separation device through the nanobubble water outlet pipeline; S35: Geosmin and Skatole are enriched at the gas-liquid interface of the formed foam, and the pollutant-containing foam is separated by the foam separation equipment; S36: The foam is passed through the upper pipeline into the foam collecting device by a negative pressure pump and is collected. The surface of the discharged bubbles contains a surfactant, and the surface tension of the bubbles is reduced to cause the bubbles to burst, forming a large number of bubble clusters or a thin foam layer. S37: The treated water enters the water collection device through the lower pipe; S38: draining the water in the water collection device; S39: Clean the device by introducing deionized water into the water inlet pipe, and repeat the step S1 again after cleaning.

[0013] Further, step S4 includes the following steps: S41: According to the formation of foam in S3, the foam volume is recorded, and the foam volume under different variables is compared.

[0014] Compared with the prior art, the device and method for removing odor-causing micro-pollutants based on nanobubble technology provided by the present invention have the following beneficial effects: ① The present invention uses nanobubble technology coupled with surfactants to remove odor compounds in aqueous solution through foam separation; ② Nanobubbles are different from large bubbles in that they have higher stability against rupture or dissolution and larger surface area for pollutant adsorption and capture. Compared with large bubble foam separation, nanobubble foam separation further improves mass transfer efficiency and reaction efficiency, can improve wastewater treatment effects, and increases removal kinetics by about 5-6 times.

[0015] ③ Based on the device of the present invention, a cationic surfactant CTAB and an anionic surfactant SDS are compared. The cationic surfactant CTAB produces a greater foaming ability and a higher foam volume compared with SDS. The use of the cationic surfactant CTAB can control costs, and any CTAB on the market can be used. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of the overall structure of a device for removing odor-causing micro-pollutants based on nanobubble technology according to the present invention; Figure 2 The removal rate of Geosmin and Skatole in water using nanobubble or macrobubble foam fractionation for 60 min; In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Nano bubble generating equipment; 11. Water inlet pipeline; 12. Air inlet pipeline; 13. Air pump; 2. Foam separation equipment; 21. Nano bubble water outlet pipeline; 3. Foam collecting device; 31. Upper pipeline; 32. Negative pressure pump; 4. Water outlet collecting device; 41. Lower pipeline; 42. Drain pipe. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0023] The translations of the English words in this application are as follows: Geosmin: Geosmin; Skatole: skatole; Nanobubble-geosmin: Nanobubble-geosmin; Nanobubble-skatole: Nanobubble-skatole; Microbubble-geosmin: Microbubble-geosmin; Microbubble-skatole: Microbubble-skatole. Example 1

[0024] like Figure 1 As shown, the present invention provides a device for removing odor-causing micro-pollutants based on nanobubble technology, which includes a nanobubble generating device 1 and a foam separation device 2. The left side of the nanobubble generating device 1 is provided with a water inlet pipeline 11 and an air inlet pipeline 12 which are fixedly connected and communicated with the inside thereof, and the air inlet pipeline 12 is connected with an air pump 13. The right side of the nanobubble generating device 1 and the left side of the foam separation device 2 are both provided with a nanobubble water outlet pipeline 21 which is fixedly connected and communicated with the inside thereof; The upper right part of the foam separation device 2 is provided with one end of an upper pipeline 31 which is fixedly connected and communicated with the inside thereof, the other end of the upper pipeline 31 extends into the foam collection device 3, and the upper pipeline 31 is connected with a negative pressure pump 32; One end of a lower pipe 41 is fixedly connected to and communicated with the inside of the foam separation device 2 at the lower right side thereof, and the other end of the lower pipe 41 extends into the water outlet collection device 4 .

[0025] Optionally, in the above technical solution, the lower pipeline 41 and the water collection device 4 are movably connected, and the right side of the water collection device 4 is provided with one end of a drain pipe 42 which is fixedly connected and communicated with the interior thereof, and the other end of the drain pipe 42 is connected to the water treatment tail device.

[0026] The present invention provides a method for removing odor-causing micro-pollutants based on nanobubble technology, which comprises the following steps: S1: Prepare the raw aqueous solution of simulated sewage; S2: adding surfactant to the original aqueous solution and adjusting the reaction conditions; S3: treating the prepared raw aqueous solution through the device; S4: Observe the foam volume and determine the most appropriate surfactant concentration and reaction conditions based on the foam morphology.

[0027] Optionally, in the above technical solution, step S1 includes the following steps: S11: Prepare a stock solution (10 mg / L) by dissolving 5 mL of Geosmin (liquid) and 0.4 mg of Skatole (solid) in 40 mL of deionized water, respectively. Among them, according to the formula C=m / V, Geosmin is an oily substance at room temperature, and the mass fraction of its pure solute is 0.08 mg / mL. 5 mL of Geosmin dissolved in 40 mL of deionized water can obtain a 10 mg / L stock solution, and 0.4 mg of Skatole dissolved in 40 mL of deionized water can obtain a 10 mg / L stock solution, so that the stock solution concentrations of the two components are consistent.

[0028] S12: The two stock solutions were added into deionized water and diluted to simulate the original polluted aqueous solution. The concentrations of the pollutants Geosmin and Skatole in the original polluted aqueous solution were both 100 μg / L.

[0029] The specific volume of deionized water added is related to the volume of the original aqueous solution for reaction treatment. According to the formula C1×V1=C2×V2, the concentration before dilution×the volume before dilution=the concentration after dilution×the volume after dilution, the volume of deionized water and stock solution required to be added can be calculated; Among them, taking the treatment of the original aqueous solution with a final volume of 1L (V2) as an example, to obtain a stock solution with a final concentration of 100μg / L (C2), according to the concentration before dilution of 10mg / L (V1), it can be concluded that the volume of stock solution to be added is 10mL (V2); If 1L of raw water solution needs to be treated, 10mL of stock solution and 990mL of deionized water should be added to obtain a simulated polluted raw water solution with a concentration of 100μg / L for both Geosmin and Skatole. Optionally, in the above technical solution, step S2 includes the following steps: S21: according to step S1, the original aqueous solution is obtained, different surfactant components and concentrations are added, and different reaction adjustments are adjusted, so as to perform comparative processing on the original aqueous solution through the control variable method.

[0030] Optionally, in the above technical solution, step S3 includes the following steps: S31: the adjusted raw water solution obtained in step S2 enters the nano bubble generating device 1 through the water inlet pipe 11; S32: providing gas with a set pressure into the nano bubble generating device 1 through the air intake pipe 12 and the air pump 13; The pressure range is 0.1MPa-0.2MPa, and the gas flow rate is 200mL / min.

[0031] S33: the gas and the raw aqueous solution are mixed in the nano bubble generating device 1, so that nano bubbles are formed in the raw aqueous solution; S34: the raw water solution mixed with nanobubbles is input into the foam separation device 2 through the nanobubble water outlet pipe 21; S35: Geosmin and Skatole are enriched at the gas-liquid interface of the formed foam, and the pollutant-containing foam is separated by the foam separation device 2; S36: The negative pressure pump 32 allows the foam to pass through the upper pipe 31 and enter the foam collecting device 3 to be collected. The surface of the discharged bubbles contains a surfactant, and the surface tension of the bubbles is reduced to cause the bubbles to burst, forming a large number of bubble clusters or a thin foam layer. S37: The treated water enters the water collection device 4 through the lower pipe 41; S38: draining the water in the water collection device 4; S39: Clean the device by introducing deionized water into the water inlet pipe 11, and repeat the step S1 again after cleaning.

[0032] Optionally, in the above technical solution, step S4: comprises the following steps: S41: According to the formation of foam in S3, the foam volume is recorded, and the foam volume under different variables is compared.

[0033] Furthermore, one-way valves are provided on both the upper pipeline 31 and the lower pipeline 41 so that the treated water and foam can only flow along a path from left to right.

[0034] Furthermore, the foam collecting device 3 has a top cover, and a sealing structure is formed between the upper pipeline 31 and the foam collecting device 3 .

[0035] Among them, the present invention can provide gas media with different components (air, oxygen, ozone or a mixture thereof) to the nano bubble generating device 1 through the air intake pipeline 12, thereby broadening the application scenarios.

[0036] Furthermore, the water treatment tail-end device includes advanced oxidation (ozone, ultraviolet hydrogen peroxide), activated carbon adsorption, membrane components, etc., and tap water is obtained through deep treatment.

[0037] Among them, the water flowing into the water outlet collection device 4 of this device can be directly poured out through the separation of the water outlet collection device 4 and the lower pipe 41, or the water can be discharged into the water treatment tail end device through the drain pipe 42; the above two methods of discharging water are both for the next water treatment.

[0038] Among them, the water supply flow rate of the nano bubble water outlet pipe 21 is consistent with the drainage flow rate of the lower pipe 41, that is, the total amount of water and the residence time in the foam collection device 3 are relatively stable.

[0039] The following is an experimental example of this method: In Experimental Examples 1-9, deionized water was used to prepare the original aqueous solution with a concentration of 100 μg / L of Geosmin and Skatole to form a mixed solution; the original aqueous solution volume was 1 L as an example.

[0040] The reaction adjustment method in the experimental example is to use a pH meter to detect before adjusting the pH value, add hydrochloric acid when the pH value is high, and add sodium hydroxide when the pH value is low to adjust the pH value. The purpose is to meet the single variable principle and eliminate the interference of pH changes on the experimental results. The amount of addition should be determined according to the actual amount of water treated and the water quality conditions at the time; In real natural water bodies, water quality treatment will not change the pH value of the entire river. The change in pH is to simulate the actual pH value of river water, which may change with factors such as rainfall. The following experimental results show that the change in pH value has little effect on the treatment effect of the reaction device, indicating its universality.

[0041] Experimental Example 1 A cationic surfactant CTAB with a concentration of 20 ppm is added to the mixed solution, and the reaction condition is adjusted to pH=7. After adjustment, the solution is introduced into the water inlet pipe 11; gas is introduced from the air inlet pipe 12 to form nanobubbles in the nanobubble generating device 1.

[0042] Time (min) Nanobubble volume (ml) 0 0 10 1375 20 700 30 250 40 130 50 97 60 70 Experimental Example 2 A cationic surfactant CTAB with a concentration of 10 ppm is added to the mixed solution, and the reaction condition is adjusted to pH=7. After adjustment, the solution is introduced into the water inlet pipe 11 ; gas is introduced from the air inlet pipe 12 to form nanobubbles in the nanobubble generating device 1 .

[0043] Time (min) Nanobubble volume (ml) 0 0 10 287 20 233 30 200 40 130 50 97 60 70 Experimental Example 3 Anionic surfactant SDS with a concentration of 10 ppm is added to the mixed solution, and the reaction condition is adjusted to pH=7. After adjustment, the solution is introduced into the water inlet pipe 11; gas is introduced into the air inlet pipe 12 to form nanobubbles in the nanobubble generating device 1.

[0044] Time (min) Nanobubble volume (ml) 0 0 10 110 20 60 30 30 40 10 50 8 60 0 Experimental Example 4 Anionic surfactant SDS with a concentration of 20 ppm is added to the mixed solution, and the reaction condition is adjusted to pH=7. After adjustment, the solution is introduced into the water inlet pipe 11; gas is introduced into the air inlet pipe 12 to form nanobubbles in the nanobubble generating device 1.

[0045] Time (min) Nanobubble volume (ml) 0 0 10 380 20 375 30 250 40 130 50 97 60 70 According to Experimental Examples 1-4, under the same reaction conditions, the cationic surfactant CTAB with a concentration of 20 ppm in Experimental Example 1 has the best effect. By observing the volume of nanobubbles and based on the initial growth rate of the foam size within the first 10 minutes, it is concluded that the foam volume in Experimental Example 1 is the largest, and this concentration of cationic surfactant is subsequently used to adjust the reaction conditions.

[0046] Experimental Example 5 A cationic surfactant CTAB with a concentration of 20 ppm is added to the mixed solution, and the reaction condition is adjusted to pH=3. After adjustment, the solution is introduced into the water inlet pipe 11; gas is introduced into the air inlet pipe 12 to form nanobubbles in the nanobubble generating device 1.

[0047] Time (min) Nanobubble volume (ml) 0 0 10 750 20 400 30 100 40 50 50 50 60 50 Experimental Example 6 A cationic surfactant CTAB with a concentration of 20 ppm is added to the mixed solution, and the reaction condition is adjusted to pH=11. After adjustment, the solution is introduced into the water inlet pipe 11; gas is introduced into the air inlet pipe 12 to form nanobubbles in the nanobubble generating device 1.

[0048] Time (min) Nanobubble volume (ml) 0 0 10 1250 20 800 30 600 40 300 50 200 60 170 According to the above Experimental Examples 1 and 5-6, it can be concluded that under neutral and alkaline conditions (i.e., pH ≥ 7), the foam volume is larger in the same time. Since Geosmin and Skatole are enriched at the gas-liquid interface of the formed foam, the foam volume is larger, and more Geosmin and Skatole are removed; therefore, the cationic surfactant CTAB with a pH of 7 and a concentration of 20 ppm is used subsequently.

[0049] Experimental Example 7 A cationic surfactant CTAB with a concentration of 20 ppm is added to the mixed solution, and the reaction conditions are adjusted to pH = 7 and salinity = 10 mM. After adjustment, the solution is introduced into the water inlet pipe 11; gas is introduced into the air inlet pipe 12 to form nanobubbles in the nanobubble generating device 1.

[0050] Time (min) Nanobubble volume (ml) 0 0 10 975 20 750 30 380 40 350 50 340 60 327 Experimental Example 8 A cationic surfactant CTAB with a concentration of 20 ppm is added to the mixed solution, and the reaction conditions are adjusted to pH=7 and salinity=100 mM. After adjustment, the solution is introduced into the water inlet pipe 11; gas is introduced into the air inlet pipe 12 to form nanobubbles in the nanobubble generating device 1.

[0051] Time (min) Nanobubble volume (ml) 0 0 10 970 20 900 30 700 40 450 50 350 60 337 According to the above experimental examples 7-8, it can be concluded that the change in salinity has little effect on foam generation and pollutant removal, and both have good removal effects.

[0052] Experimental Example 9 A cationic surfactant CTAB with a concentration of 20 ppm was added to the mixed solution, and the reaction conditions were adjusted to pH = 7, salinity = 100 mM, and then introduced into the water inlet pipe 11 after adjustment; in this experimental example, the nanogenerator was replaced as a whole with a microporous aeration head, and gas was introduced from the air inlet pipe 12 to form large bubbles in the microporous aeration head.

[0053] Time (min) Large bubble volume (ml) 0 0 10 250 20 155 30 130 40 100 50 50 60 20 As shown in Experimental Examples 1 and 9, under the same reaction conditions, the foam generated by nanobubbles is much more than that generated by large bubbles, indicating that the removal effect of using nanobubbles is much higher than that of large bubbles.

[0054] Experimental Example 10 A cationic surfactant CTAB with a concentration of 20 ppm was added to the mixed solution (the original aqueous solution in this experimental example was a mixed solution of Geosmin and Skatole with a concentration of 100 μg / L prepared from actual water (river water), the bubbles introduced were nanobubbles, and the reaction conditions were pH=7.

[0055] Time (min) Nanobubble volume (ml) 0 0 10 1200 20 700 30 250 40 130 50 97 60 70 The water quality entering the water collecting device 4 in each experimental example is tested by liquid chromatography, and the following results can be obtained: Figure 2 As shown in the figure, under real river water conditions, when CTAB concentration was 20 mg / L, the removal rate of odor micropollutant Geosmin by nanobubble foam separation was over 80%, while the removal rate of large bubbles could only reach 30% at most.

[0056] In summary, the comparative treatments of aqueous solutions contaminated with Geosmin and Skatole as targets were used to compare the foaming capacity and stability of the forms produced under different conditions; according to the above experimental examples, it can be seen that due to the high concentration of surfactant in the solution, the initial growth rate of the foam size (foaming stability) in the first 10 minutes is high, and after about 10-15 minutes, when the surfactant is exhausted, the increase in foam volume stops and the volume of foam produced begins to decrease. Obviously, the volume shrinkage reflects the foam stability, which varies with the bubble size and the water chemistry of the solution; As shown by the relatively long collapse or retention time of the generated foam bubbles, the cationic surfactant CTAB has a stronger foaming ability (maximum foam volume 1350 mL) compared with the anionic surfactant SDS (maximum foam volume 430 mL), and the increase of CTAB concentration from 10 mg / L to 20 mg / L further improves the foaming ability and stability; moreover, when all other conditions remain at the same level (e.g., pH = 7; IS = 10 mM; and [CTAB] = 20 mg / L), the decay rate of large bubble foam is much faster than that of nanobubble foam.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for removing odor-causing micropollutants based on nanobubble technology, characterized in that: The invention comprises a nano bubble generating device (1) and a foam separation device (2), wherein the left side of the nano bubble generating device (1) is provided with a water inlet pipeline (11) and an air inlet pipeline (12) which are fixedly connected and communicated with the inside thereof, the air inlet pipeline (12) is connected with an air pump (13), and the right side of the nano bubble generating device (1) and the left side of the foam separation device (2) are both provided with a nano bubble water outlet pipeline (21) which is fixedly connected and communicated with the inside thereof; The upper right part of the foam separation device (2) is provided with one end of an upper pipeline (31) fixedly connected and communicated with the interior thereof, the other end of the upper pipeline (31) extends into the foam collection device (3), and the upper pipeline (31) is connected to a negative pressure pump (32); The lower right part of the foam separation device (2) is provided with one end of a lower pipe (41) fixedly connected to and communicated with the interior thereof, and the other end of the lower pipe (41) extends into the water outlet collection device (4).

2. The device for removing odor-causing micropollutants based on nanobubble technology according to claim 1, characterized in that: The lower pipeline (41) is movably connected to the water collection device (4), and one end of a drainage pipe (42) fixedly connected and communicated with the inside of the water collection device (4) is provided on the right side of the water collection device (4), and the other end of the drainage pipe (42) is connected to the water treatment tail device.

3. A method for removing odor-causing micropollutants based on nanobubble technology, characterized in that: The following steps are involved: S1: Prepare the raw aqueous solution of simulated sewage; S2: adding surfactant to the original aqueous solution and adjusting the reaction conditions; S3: treating the prepared raw aqueous solution through the device; S4: Observe the foam volume and determine the most appropriate surfactant concentration and reaction conditions based on the foam morphology.

4. A method for removing odor-causing micropollutants based on nanobubble technology according to claim 3, characterized in that: Step S1 includes the following steps: S11: Prepare a stock solution (10 mg / L) by dissolving 5 mL of Geosmin and 0.4 mg of Skatole in 40 mL of deionized water, respectively. S12: The two stock solutions were diluted separately to prepare simulated polluted original aqueous solutions, and the concentrations of the pollutants Geosmin and Skatole in the simulated polluted original aqueous solutions were both 100 μg / L.

5. A method for removing odor-causing micropollutants based on nanobubble technology according to claim 4, characterized in that: Step S2 includes the following steps: S21: Obtain the original aqueous solution according to step S1, add different surfactant components and concentrations, adjust different reaction adjustments, and thus perform comparative treatment on the original aqueous solution through the control variable method.

6. A method for removing odor-causing micropollutants based on nanobubble technology according to claim 5, characterized in that: Step S3 includes the following steps: S31: The adjusted raw aqueous solution obtained in step S2 enters the nano bubble generating device (1) through the water inlet pipeline (11); S32: supplying gas having a set pressure into the nano bubble generating device (1) through the air inlet pipeline (12) and the air pump (13); S33: the gas and the raw aqueous solution are mixed in the nano bubble generating device (1), thereby forming nano bubbles in the raw aqueous solution; S34: the raw water solution mixed with nanobubbles is input into the foam separation device (2) through the nanobubble water outlet pipeline (21); S35: Geosmin and Skatole are enriched at the gas-liquid interface of the formed foam, and the pollutant-containing foam is separated by the foam separation device (2); S36: The foam is caused to enter the foam collecting device (3) through the upper pipe (31) by the negative pressure pump (32) and be collected. The surface of the discharged bubbles contains a surfactant, and the surface tension of the bubbles is reduced, causing the bubbles to burst, thereby forming a large number of bubble clusters or a thin foam layer. S37: allowing the treated water to enter the water collection device (4) through the lower pipe (41); S38: draining the water in the water collection device (4); S39: Clean the device by introducing deionized water into the water inlet pipe (11), and repeat the step S1 again after cleaning.

7. The method for removing odor-causing micropollutants based on nanobubble technology according to claim 6, characterized in that: Step S4: comprises the following steps: S41: According to the formation of foam in S3, the foam volume is recorded, and the foam volume under different variables is compared.

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