CN115180739A - Method for removing 2-methylisoborneol and geosmin in drinking water - Google Patents

Method for removing 2-methylisoborneol and geosmin in drinking water Download PDF

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CN115180739A
CN115180739A CN202210843678.0A CN202210843678A CN115180739A CN 115180739 A CN115180739 A CN 115180739A CN 202210843678 A CN202210843678 A CN 202210843678A CN 115180739 A CN115180739 A CN 115180739A
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mixed solution
drinking water
water
activated carbon
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CN115180739B (en
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马军
张瑛洁
程喜全
王凯
宋丹
隋潇
徐美庆
张楠楠
朱彦磊
刘鹏程
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Weihai Zhijie Environmental Protection Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/02—Sulfur, selenium or tellurium; Compounds thereof
    • B01J27/04—Sulfides
    • B01J27/047—Sulfides with chromium, molybdenum, tungsten or polonium
    • B01J27/051—Molybdenum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
    • B01J31/1691—Coordination polymers, e.g. metal-organic frameworks [MOF]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
    • B01J31/22—Organic complexes
    • B01J31/2204—Organic complexes the ligands containing oxygen or sulfur as complexing atoms
    • B01J31/2208—Oxygen, e.g. acetylacetonates
    • B01J31/2226—Anionic ligands, i.e. the overall ligand carries at least one formal negative charge
    • B01J31/223—At least two oxygen atoms present in one at least bidentate or bridging ligand
    • B01J31/2239—Bridging ligands, e.g. OAc in Cr2(OAc)4, Pt4(OAc)8 or dicarboxylate ligands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/30—Complexes comprising metals of Group III (IIIA or IIIB) as the central metal
    • B01J2531/38—Lanthanides other than lanthanum
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/34—Organic compounds containing oxygen

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Abstract

A method for removing 2-methylisoborneol and geosmin in drinking water relates to a drinking water treatment method, in particular to a method for removing 2-methylisoborneol and geosmin in drinking water. The invention aims to solve the problem that the conventional precipitation-filtration-disinfection process is difficult to remove the 2-methylisoborneol and the geosmin in the drinking water. The method comprises the following steps: 1. treating by an air floatation device; 2. adding a catalytic adsorbent; 3. ozone oxidation; 4. and (3) filtering by adopting a catalytic ceramic membrane. The method can effectively remove the 2-methylisoborneol and the geosmin in the drinking water, the removal rate can reach more than 98 percent, the concentration of the 2-methylisoborneol in the effluent is lower than 0.000005mg/L, and the concentration of the geosmin is lower than 0.0000005mg/L. The invention can obtain a method for removing 2-methylisoborneol and geosmin in drinking water.

Description

Method for removing 2-methylisoborneol and geosmin in drinking water
Technical Field
The invention relates to a drinking water treatment method, in particular to a method for removing 2-methylisoborneol and geosmin in drinking water.
Background
Deodorization and deodorization are always one of the core problems in drinking water treatment. The odor is expressed by the combined action of various organic and inorganic substances in water, including soil particles, rotten plants, microorganisms (plankton, bacteria, fungi, etc.), various inorganic salts (such as chloride, sulfide, calcium, iron and manganese), organic substances, some gases, and the like. Trace organic substances (such as MIB, geosmin and the like) generated by aquatic plants under the action of certain microorganisms (such as actinomycetes, blue-green algae and the like) are also main sources of smells. The odor of water is mainly caused by organic matters such as humus, algae, actinomycetes and fungi and excessive chlorine, and the main odor-causing matters are geosmin, 2-methyl isopulegol, 2,4, 6-trichloro-huichthyol and the like. Many compounds, even in small amounts in water, can produce an odor and taste. For example, the content of the terramycin (geosmim) and the content of the 2-methyliso-2-arrowol (MIB) are respectively 10 ng/L and 29ng/L, which are mainly metabolites of actinomycetes and yellow green algae, and the membrane technology for producing mud, soil, musty smell and the like is taken as the core technology of the third-generation water purification process. In recent years, seasonal water quality changes caused by algal outbreaks have been attracting attention, and the increase in odor such as the content of geosmin and 2-methylisoborneol has been a problem in handling the number of references. With the release of the sanitary standard GB5749-2022 for drinking water, the removal of odorous pollutants such as geosmin and 2-methylisoborneol becomes the key for improving the quality and the yield of water plants, and the conventional precipitation-filtration-disinfection process is difficult to meet the requirements.
Disclosure of Invention
The invention aims to solve the problem that the conventional precipitation-filtration-disinfection process is difficult to remove the 2-methylisoborneol and the geosmin in the drinking water, and provides a method for removing the 2-methylisoborneol and the geosmin in the drinking water.
A method for removing 2-methylisoborneol and geosmin from drinking water comprises the following steps
1. Feeding the drinking water to be treated into an air flotation device, and recovering algae and floc impurities in the water by using the air flotation device to obtain drinking water subjected to air flotation treatment;
2. adding a catalytic adsorbent into the drinking water after air flotation treatment to obtain drinking water with a part of micro pollutants in the water removed;
the catalytic adsorbent in the step two is graphene catalytic modified activated carbon, molybdenum sulfide catalytic modified activated carbon or MOFs catalytic modified activated carbon;
3. an ozone oxidation process is adopted to further remove micro-pollutants in the water;
4. and (3) filtering by adopting a catalytic ceramic membrane filtering device, wherein the produced water is drinking water from which 2-methylisoborneol and geosmin are removed.
The invention has the advantages that:
1. the invention has developed a method for removing 2-methyl isoborneol and geosmin in the drinking water, said method can remove 2-methyl isoborneol and geosmin in the drinking water effectively, the removal rate can be more than 98%, the concentration of 2-methyl isoborneol in the effluent is lower than 0.000005mg/L, the concentration of geosmin is lower than 0.0000005mg/L;
2. the invention avoids generating halogen-containing disinfection byproducts, can effectively kill microbial cells in backwashing water, and prevents membrane pollution; the separation membrane can realize gravity drive, and the permeation flux can reach 200L m -2 h -1 The recovery rate is more than 98%, the membrane flux recovery rate is more than 99%, the cleaning period is more than one week, the operation cost is low, and the backwashing water can be efficiently recovered;
3. according to the invention, the graphene catalytic modified activated carbon, the molybdenum sulfide catalytic modified activated carbon and the MOFs catalytic modified activated carbon are used for carrying out catalytic adsorption on micro pollutants in water, so that the concentrations of 2-methylisoborneol and geosmin are effectively reduced.
The invention can obtain a method for removing 2-methylisoborneol and geosmin in drinking water.
Detailed Description
The following examples further illustrate the present invention but are not to be construed as limiting thereof. Modifications and substitutions to methods, steps or conditions of the present invention may be made without departing from the spirit of the invention.
The first embodiment is as follows: the method for removing 2-methylisoborneol and geosmin in drinking water of the embodiment is specifically completed according to the following steps
1. Feeding the drinking water to be treated into an air flotation device, and recovering algae and floc impurities in the water by using the air flotation device to obtain drinking water subjected to air flotation treatment;
2. adding the catalytic adsorbent into the drinking water after air floatation treatment to obtain drinking water from which a part of micro pollutants in the water are removed;
the catalytic adsorbent in the step two is graphene catalytic modified activated carbon, molybdenum sulfide catalytic modified activated carbon or MOFs catalytic modified activated carbon;
3. an ozone oxidation process is adopted to further remove micro-pollutants in the water;
4. the catalytic ceramic membrane filtering device is adopted for filtering, gravity type low-pollution operation is realized, and the effluent is drinking water for removing 2-methylisoborneol and geosmin.
The second embodiment is as follows: the first difference between the present embodiment and the present embodiment is: the air floatation device in the step one is a dissolved air floatation device, the air water amount is 10 mL/L-200 mL/L, and the operation pressure is 0.05 MPa-1.0 MPa. Other steps are the same as in the first embodiment.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: the graphene catalytic modified activated carbon is prepared by the following steps:
1. dispersing graphene oxide, urea, cerium nitrate and sodium citrate into ethylene glycol, and performing ultrasonic dispersion to obtain a mixed solution;
the mass fraction of the graphene oxide in the mixed solution in the first step is 0.1-0.5%;
the mass fraction of the sodium citrate in the mixed solution in the step one is 0.03-0.06%;
the mass fraction of the cerium nitrate in the mixed solution in the step one is 0.3-0.6%;
the mass fraction of urea in the mixed solution in the step one is 0.04-0.05%;
2. and placing the mixed solution in a hydrothermal reaction kettle, then immersing the activated carbon into the mixed solution, sealing the hydrothermal reaction kettle, heating to 180-220 ℃, carrying out hydrothermal reaction at 180-220 ℃ for 10-12 h, cooling to room temperature, cleaning, and drying to obtain the graphene catalytic modified activated carbon. The other steps are the same as in the first or second embodiment.
The fourth concrete implementation mode is as follows: the difference between this embodiment and one of the first to third embodiments is as follows: the molybdenum sulfide catalytic modified activated carbon is prepared by the following steps:
1. dispersing molybdenum disulfide, urea, cerium nitrate and sodium citrate into ethylene glycol, and performing ultrasonic dispersion to obtain a mixed solution;
the mass fraction of molybdenum disulfide in the mixed solution in the step one is 1-2%;
the mass fraction of the sodium citrate in the mixed solution in the step one is 0.03-0.06%;
the mass fraction of the cerium nitrate in the mixed solution in the step one is 0.3-0.6%;
the mass fraction of urea in the mixed solution in the step one is 0.04-0.05%;
2. and placing the mixed solution into a hydrothermal reaction kettle, then immersing the activated carbon into the mixed solution, sealing the hydrothermal reaction kettle, heating to 180-220 ℃, carrying out hydrothermal reaction at 180-220 ℃ for 10-12 h, cooling to room temperature, cleaning, and drying to obtain the molybdenum disulfide catalytic modified activated carbon. The other steps are the same as those in the first to third embodiments.
The fifth concrete implementation mode: the difference between this embodiment and the first to the fourth embodiments is: the MOFs catalytic modified activated carbon is prepared by the following steps:
1. dissolving cerium nitrate into a mixed solution of dimethylformamide and water, adding terephthalic acid, and performing ultrasonic treatment to obtain a mixed solution;
the volume ratio of the mass of the terephthalic acid to the mixed solution of the dimethylformamide and the water in the step one is (0.5 g-1 g) 10mL;
the volume ratio of the mass of the cerium nitrate to the mixed solution of the dimethyl formamide and the water in the step one is (0.3 g-0.6 g) 10mL;
the volume ratio of the dimethylformamide to the water in the dimethylformamide/water mixed solution in the first step is 10;
2. transferring the mixed solution into a hydrothermal reaction kettle, immersing activated carbon into the mixed solution, sealing the hydrothermal reaction kettle, heating to 150-170 ℃, carrying out hydrothermal reaction for 6-8 h at 150-170 ℃, cooling to room temperature, cleaning, and drying to obtain the MOFs catalytic modified activated carbon. The other steps are the same as those in the first to fourth embodiments.
The sixth specific implementation mode is as follows: the difference between this embodiment and one of the first to fifth embodiments is: in the third step, the ozone oxidation process adopts a flat plate type ozone generator or a tubular type ozone generator. The other steps are the same as those in the first to fifth embodiments.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: in the third step, the ozone oxidation process adopts a micro-nano bubble mode for aeration, and the aeration rate is 0.01 mg/L-1.0 mg/L. The other steps are the same as those in the first to sixth embodiments.
The specific implementation mode eight: the difference between this embodiment and one of the first to seventh embodiments is: in the fourth step, the aperture of the catalytic ceramic membrane hole in the catalytic ceramic membrane filtering device is 10 nm-1000 nm, the component is in a flat plate type or a tubular type, the gravity type driving is adopted, and the water head is 0.1 m-1 m. The other steps are the same as those in the first to seventh embodiments.
The following examples were employed to demonstrate the beneficial effects of the present invention:
example 1: a method for removing 2-methylisoborneol and geosmin in drinking water is specifically completed according to the following steps:
1. feeding the drinking water to be treated into an air floatation device, and recovering algae and floc impurities in the water by using the air floatation device to obtain drinking water subjected to air floatation treatment;
the air floatation device in the step one is a dissolved air floatation device, the air water amount is 40mL/L, and the operation pressure is 0.2MPa;
2. adding a catalytic adsorbent into the drinking water subjected to air floatation treatment for catalytic adsorption for 5 hours to obtain drinking water from which a part of micro pollutants in the water are removed;
the adding amount of the catalytic adsorbent in the step two is 30g/L;
the catalytic adsorbent in the step two is graphene catalytic modified activated carbon, and the preparation method is completed according to the following steps:
(1) dispersing graphene oxide, urea, cerium nitrate and sodium citrate into ethylene glycol, and performing ultrasonic dispersion to obtain a mixed solution;
the mass fraction of graphene oxide in the mixed solution in the step (1) is 0.5%;
the mass fraction of sodium citrate in the mixed solution in the step (1) is 0.05 percent;
the mass fraction of the cerium nitrate in the mixed solution in the step (1) is 0.6%;
the mass fraction of urea in the mixed solution in the step (1) is 0.05%;
(2) placing the mixed solution in a hydrothermal reaction kettle, then immersing activated carbon in the mixed solution, sealing the hydrothermal reaction kettle, heating to 200 ℃, carrying out hydrothermal reaction at 200 ℃ for 10 hours, cooling to room temperature, cleaning, and drying to obtain graphene catalytic modified activated carbon;
the activated carbon in the step (2) is commercial activated carbon, and the specific surface area is 1500m 2 /g～1700m 2 (iv) g, having micropores therein;
3. carrying out oxidation treatment for 2h by adopting an ozone oxidation process to further remove micro pollutants in the water;
in the third step, the ozone oxidation process adopts a flat plate type ozone generator; in the third step, a micro-nano bubble mode is adopted for aeration in the ozone oxidation process, and the aeration rate is 0.2mg/L;
4. a catalytic ceramic membrane filtering device is adopted for filtering, so that gravity type low-pollution operation is realized, and the effluent is drinking water (which reaches the drinking water standard) from which 2-methylisoborneol and geosmin are removed;
in the fourth step, the aperture of the catalytic ceramic membrane hole in the catalytic ceramic membrane filtering device is 500nm, the component is in a flat plate type, the gravity type driving is adopted, and the water head is 0.3m.
Example 2: a method for removing 2-methylisoborneol and geosmin in drinking water is specifically completed according to the following steps:
1. feeding the drinking water to be treated into an air flotation device, and recovering algae and floc impurities in the water by using the air flotation device to obtain drinking water subjected to air flotation treatment;
the air floatation device in the first step is a dissolved air floatation device, the air water amount is 20mL/L, and the operating pressure is 0.6MPa;
2. adding a catalytic adsorbent into the drinking water subjected to air floatation treatment for catalytic adsorption for 3 hours to obtain drinking water from which a part of micro pollutants in the water are removed;
the adding amount of the catalytic adsorbent in the step two is 28g/L;
the catalytic adsorbent in the step two is molybdenum sulfide catalytic modified activated carbon, and the preparation method comprises the following steps:
(1) dispersing molybdenum disulfide, urea, cerium nitrate and sodium citrate into ethylene glycol, and performing ultrasonic dispersion to obtain a mixed solution;
the mass fraction of molybdenum disulfide in the mixed solution in the step (1) is 2%;
the mass fraction of sodium citrate in the mixed solution in the step (1) is 0.06%;
the mass fraction of cerium nitrate in the mixed solution in the step (1) is 0.6%;
the mass fraction of urea in the mixed solution in the step (1) is 0.05 percent;
(2) placing the mixed solution in a hydrothermal reaction kettle, then immersing activated carbon in the mixed solution, sealing the hydrothermal reaction kettle, heating to 200 ℃, carrying out hydrothermal reaction at 200 ℃ for 10 hours, cooling to room temperature, cleaning, and drying to obtain molybdenum disulfide catalytic modified activated carbon;
the activated carbon in the step (2) is commercial activated carbon, and the specific surface area is 1500m 2 /g～1700m 2 (ii)/g, having micropores therein;
3. carrying out oxidation treatment for 2h by adopting an ozone oxidation process to further remove micro pollutants in the water;
the ozone oxidation process in the third step is to adopt a flat plate type ozone generator; in the third step, the ozone oxidation process adopts a micro-nano bubble mode for aeration, and the aeration rate is 0.1mg/L;
4. a catalytic ceramic membrane filtering device is adopted for filtering, so that gravity type low-pollution operation is realized, and the effluent is drinking water (which reaches the drinking water standard) from which 2-methylisoborneol and geosmin are removed;
in the fourth step, the aperture of the catalytic ceramic membrane hole in the catalytic ceramic membrane filtering device is 300nm, the component is in a flat plate type, the gravity type driving is adopted, and the water head is 0.4m.
Example 3: a method for removing 2-methylisoborneol and geosmin in drinking water is specifically completed according to the following steps:
1. feeding the drinking water to be treated into an air floatation device, and recovering algae and floc impurities in the water by using the air floatation device to obtain drinking water subjected to air floatation treatment;
the air floatation device in the first step is a dissolved air floatation device, the air water amount is 50mL/L, and the operating pressure is 0.2MPa;
2. adding a catalytic adsorbent into the drinking water subjected to air floatation treatment for catalytic adsorption for 4 hours to obtain drinking water from which a part of micro pollutants in the water are removed;
the adding amount of the catalytic adsorbent in the step two is 25g/L;
the catalytic adsorbent in the step two is MOFs catalytic modified activated carbon, and the preparation method comprises the following steps:
(1) dissolving cerium nitrate into a mixed solution of dimethylformamide and water, adding terephthalic acid, and performing ultrasonic treatment to obtain a mixed solution;
the volume ratio of the mass of the terephthalic acid to the mixed solution of the dimethylformamide and the water in the step (1) is 0.8g;
the volume ratio of the mass of the cerium nitrate to the mixed solution of the dimethylformamide and the water in the step (1) is 0.5g;
the volume ratio of the dimethylformamide to the water in the dimethylformamide/water mixed solution in the step (1) is 10;
(2) transferring the mixed solution into a hydrothermal reaction kettle, immersing activated carbon into the mixed solution, sealing the hydrothermal reaction kettle, heating to 160 ℃, carrying out hydrothermal reaction at 160 ℃ for 7 hours, cooling to room temperature, cleaning, and drying to obtain MOFs catalytic modified activated carbon;
the activated carbon in the step (2) is commercial activated carbon, and the specific surface area is 1500m 2 /g～1700m 2 (ii)/g, having micropores therein;
3. carrying out oxidation treatment for 2 hours by adopting an ozone oxidation process, and further removing micropollutants in the water;
the ozone oxidation process in the third step is to adopt a tubular ozone generator; in the third step, the ozone oxidation process adopts a micro-nano bubble mode for aeration, and the aeration rate is 0.3mg/L;
4. a catalytic ceramic membrane filtering device is adopted for filtering, so that gravity type low-pollution operation is realized, and the effluent is drinking water (which reaches the drinking water standard) from which 2-methylisoborneol and geosmin are removed;
in the fourth step, the aperture of the catalytic ceramic membrane hole in the catalytic ceramic membrane filtering device is 500nm, the component is in a flat plate type, the gravity type driving is adopted, and the water head is 0.3m.
Comparative example 1:
comparative example 1 the drinking water to be treated was treated by the conventional filtration-precipitation-disinfection process, in which both the 2-methylisoborneol and geosmin contents did not meet the standard requirements.
Comparative example 2:
comparative example 2 the drinking water to be treated is treated by the traditional filtration-precipitation-ultrafiltration membrane-disinfection process, wherein the contents of 2-methylisoborneol and geosmin do not meet the standard requirements.
The quality of drinking water to be treated is the same in examples 1 to 3 and comparative examples 1 to 2, and the properties of the catalytic ceramic membrane and the outlet water after filtration are shown in table 1;
TABLE 1
Figure BDA0003751343110000071
Figure BDA0003751343110000081
As can be seen from Table 1: the embodiments 1 to 3 can effectively remove the 2-methylisoborneol and the geosmin in the drinking water, and reach the safety standard of the drinking water.

Claims (8)

1. A method for removing 2-methylisoborneol and geosmin from drinking water is characterized by comprising the following steps
1. Feeding the drinking water to be treated into an air flotation device, and recovering algae and floc impurities in the water by using the air flotation device to obtain drinking water subjected to air flotation treatment;
2. adding the catalytic adsorbent into the drinking water after air floatation treatment to obtain drinking water from which a part of micro pollutants in the water are removed;
the catalytic adsorbent in the second step is graphene catalytic modified activated carbon, molybdenum sulfide catalytic modified activated carbon or MOFs catalytic modified activated carbon;
3. an ozone oxidation process is adopted to further remove micro-pollutants in the water;
4. the catalytic ceramic membrane filtering device is adopted for filtering, gravity type low-pollution operation is realized, and the effluent is drinking water for removing 2-methylisoborneol and geosmin.
2. The method of claim 1 wherein the air-floating device in step one is a dissolved air-floating device, the amount of air is 10-200 mL/L, and the operating pressure is 0.05-1.0 MPa.
3. The method for removing 2-methylisoborneol and geosmin in drinking water according to claim 1, wherein the graphene catalytic modified activated carbon is prepared by the following steps:
1. dispersing graphene oxide, urea, cerium nitrate and sodium citrate into ethylene glycol, and performing ultrasonic dispersion to obtain a mixed solution;
the mass fraction of the graphene oxide in the mixed solution in the step one is 0.1-0.5%;
the mass fraction of the sodium citrate in the mixed solution in the step one is 0.03-0.06%;
the mass fraction of the cerium nitrate in the mixed solution in the step one is 0.3-0.6%;
the mass fraction of urea in the mixed solution in the step one is 0.04-0.05%;
2. and (3) placing the mixed solution into a hydrothermal reaction kettle, then immersing the activated carbon into the mixed solution, sealing the hydrothermal reaction kettle, heating to 180-220 ℃, carrying out hydrothermal reaction at 180-220 ℃ for 10-12 h, cooling to room temperature, cleaning, and drying to obtain the graphene catalytic modified activated carbon.
4. The method of claim 1 for removing 2-methylisoborneol and geosmin from drinking water, wherein the molybdenum sulfide catalytically modified activated carbon is prepared by the following steps:
1. dispersing molybdenum disulfide, urea, cerium nitrate and sodium citrate into ethylene glycol, and performing ultrasonic dispersion to obtain a mixed solution;
the mass fraction of molybdenum disulfide in the mixed solution in the step one is 1-2%;
the mass fraction of the sodium citrate in the mixed solution in the step one is 0.03-0.06%;
the mass fraction of the cerium nitrate in the mixed solution in the step one is 0.3-0.6%;
the mass fraction of urea in the mixed solution in the step one is 0.04-0.05%;
2. and (3) placing the mixed solution into a hydrothermal reaction kettle, then immersing the activated carbon into the mixed solution, sealing the hydrothermal reaction kettle, heating to 180-220 ℃, carrying out hydrothermal reaction at 180-220 ℃ for 10-12 h, cooling to room temperature, cleaning, and drying to obtain the molybdenum disulfide catalytic modified activated carbon.
5. The method of claim 1 for removing 2-methylisoborneol and geosmin from drinking water, wherein the MOFs catalytically modified activated carbon is prepared by the following steps:
1. dissolving cerium nitrate into a mixed solution of dimethylformamide and water, adding terephthalic acid, and performing ultrasonic treatment to obtain a mixed solution;
the volume ratio of the mass of the terephthalic acid to the mixed solution of the dimethylformamide and the water in the step one is (0.5 g-1 g) 10mL;
the volume ratio of the mass of the cerium nitrate to the mixed solution of the dimethyl formamide and the water in the step one is (0.3 g-0.6 g) 10mL;
the volume ratio of the dimethylformamide to the water in the dimethylformamide/water mixed solution in the first step is 10;
2. transferring the mixed solution into a hydrothermal reaction kettle, immersing activated carbon into the mixed solution, sealing the hydrothermal reaction kettle, heating to 150-170 ℃, carrying out hydrothermal reaction for 6-8 h at 150-170 ℃, cooling to room temperature, cleaning, and drying to obtain the MOFs catalytic modified activated carbon.
6. The method of claim 1, wherein the ozone oxidation process is a flat ozone generator or a tubular ozone generator.
7. The method for removing 2-methylisoborneol and geosmin in drinking water according to claim 1, wherein aeration is performed in the ozone oxidation process in the third step by using micro-nano bubble mode, and the aeration amount is 0.01 mg/L-1.0 mg/L.
8. The method for removing 2-methylisoborneol and geosmin from drinking water as claimed in claim 1, wherein the catalytic ceramic membrane filter device in the fourth step has a catalytic ceramic membrane pore size of 10nm to 1000nm, and the module is in the form of flat plate or tube, driven by gravity, and has a water head of 0.1m to 1m.
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