CN117361709A - Ternary micro-electrolysis ceramsite-permeable reactive barrier for repairing groundwater and application thereof - Google Patents
Ternary micro-electrolysis ceramsite-permeable reactive barrier for repairing groundwater and application thereof Download PDFInfo
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- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 46
- 239000003673 groundwater Substances 0.000 title claims abstract description 33
- 230000004888 barrier function Effects 0.000 title claims description 20
- 239000002245 particle Substances 0.000 claims abstract description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 23
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000000919 ceramic Substances 0.000 claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 238000001179 sorption measurement Methods 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 11
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 10
- 238000001354 calcination Methods 0.000 claims description 8
- 238000000498 ball milling Methods 0.000 claims description 7
- 239000000440 bentonite Substances 0.000 claims description 7
- 229910000278 bentonite Inorganic materials 0.000 claims description 7
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 239000010881 fly ash Substances 0.000 claims description 7
- 235000019738 Limestone Nutrition 0.000 claims description 6
- 229910021536 Zeolite Inorganic materials 0.000 claims description 6
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 6
- 239000006028 limestone Substances 0.000 claims description 6
- 239000010457 zeolite Substances 0.000 claims description 6
- 239000012298 atmosphere Substances 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000005067 remediation Methods 0.000 claims description 4
- 238000011109 contamination Methods 0.000 claims description 3
- 125000006850 spacer group Chemical group 0.000 claims 2
- SNGREZUHAYWORS-UHFFFAOYSA-N perfluorooctanoic acid Chemical compound OC(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F SNGREZUHAYWORS-UHFFFAOYSA-N 0.000 abstract description 18
- 239000002994 raw material Substances 0.000 abstract description 12
- 229910052782 aluminium Inorganic materials 0.000 abstract description 7
- 239000002957 persistent organic pollutant Substances 0.000 abstract description 5
- 239000003344 environmental pollutant Substances 0.000 abstract description 4
- 231100000719 pollutant Toxicity 0.000 abstract description 4
- 238000005469 granulation Methods 0.000 abstract description 3
- 230000003179 granulation Effects 0.000 abstract description 3
- 230000008439 repair process Effects 0.000 abstract description 3
- 239000003638 chemical reducing agent Substances 0.000 abstract description 2
- 238000003837 high-temperature calcination Methods 0.000 abstract description 2
- 238000000227 grinding Methods 0.000 description 14
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- 238000000034 method Methods 0.000 description 10
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- 229910052799 carbon Inorganic materials 0.000 description 7
- 239000002351 wastewater Substances 0.000 description 7
- 238000005303 weighing Methods 0.000 description 6
- 238000000605 extraction Methods 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 230000003203 everyday effect Effects 0.000 description 4
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- 238000000465 moulding Methods 0.000 description 4
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- 239000013067 intermediate product Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 239000003651 drinking water Substances 0.000 description 2
- 235000020188 drinking water Nutrition 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
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- 239000012429 reaction media Substances 0.000 description 2
- 206010048610 Cardiotoxicity Diseases 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 206010019851 Hepatotoxicity Diseases 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 206010029350 Neurotoxicity Diseases 0.000 description 1
- 206010074268 Reproductive toxicity Diseases 0.000 description 1
- 206010044221 Toxic encephalopathy Diseases 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 231100000259 cardiotoxicity Toxicity 0.000 description 1
- 238000002144 chemical decomposition reaction Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
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- 239000007857 degradation product Substances 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- -1 fluoride ions Chemical class 0.000 description 1
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- 238000003895 groundwater pollution Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000007686 hepatotoxicity Effects 0.000 description 1
- 231100000304 hepatotoxicity Toxicity 0.000 description 1
- 231100000386 immunotoxicity Toxicity 0.000 description 1
- 230000007688 immunotoxicity Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 231100001240 inorganic pollutant Toxicity 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000007135 neurotoxicity Effects 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
-
- 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
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- 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
- C02F2101/36—Organic compounds containing halogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Water Treatment By Sorption (AREA)
- Electrolytic Production Of Metals (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention discloses a ternary micro-electrolysis ceramsite-permeable reaction wall for repairing groundwater and application thereof, belonging to the technical field of groundwater repair, wherein the reaction wall comprises a first chamber, a second chamber and a third chamber which are sequentially arranged; the first chamber and the third chamber are filled with adsorption media; the second chamber is filled with nZVI/Al/C ceramic particles. The invention also provides application of the ternary micro-electrolysis ceramsite-permeable reaction wall for repairing groundwater in repairing groundwater organic pollution. The invention can not only realize the adsorption of pollutants, but also degrade organic pollutants such as PFOA in groundwater. In addition, the invention does not need a large amount of reducing agent, and the required raw materials are fewer, so the cost is lower. Meanwhile, granulation is carried out through high-temperature calcination, so that the problem that nano zero-valent iron and aluminum are easy to run off is avoided.
Description
Technical Field
The invention belongs to the technical field of groundwater remediation, and particularly relates to a ternary micro-electrolysis ceramsite-permeable reactive barrier for remediating groundwater and application thereof.
Background
Perfluorinated compounds have reproductive toxicity, hepatotoxicity, cardiotoxicity, immunotoxicity, neurotoxicity and the like on human bodies, and if the perfluorinated compounds are not properly treated, the compounds are released into the environment, so that the health of wild animals and human beings can be seriously influenced, food and drinking water polluted by PFCAs are taken as main exposure sources of PFOA into human bodies, and groundwater is one of drinking water sources in China and is polluted by the PFCAs.
The groundwater pollution repair technology and risk management and control measures mainly comprise extraction treatment technology, chemical oxidation-reduction technology, biotechnology, aeration technology, permeable reactive barrier (permeable reactive barrier, PRB) technology, natural attenuation monitoring technology, double multiphase extraction technology and the like. The PRB technology does not relate to extraction of groundwater, so that the problems of high consumption, high cost, periodic maintenance and monitoring and the like of the groundwater extraction and treatment engineering in the traditional extraction treatment are avoided, and the pollution substances such as organic pollutants, heavy metals, inorganic salts and the like in the groundwater are removed through a specific reaction medium, so that the pollution components are harmless, and the purposes of blocking and repairing are achieved.
The micro-electrolysis method is a good process for treating the wastewater by forming a primary cell by utilizing a metal corrosion principle, and is also called an internal electrolysis method, a zero-valent iron method, a scrap iron filtering method and an iron-carbon method, and is a wastewater treatment technology which is widely researched and applied. Whereas conventional microelectrolysis often employs physical mixing of coke and scrap iron, the resulting microelectrolysis has limited capacity.
Therefore, how to provide a method for combining PRB with micro-electrolysis for groundwater remediation is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In order to solve the technical problems, the invention provides a ternary micro-electrolysis ceramsite-permeable reactive barrier for repairing groundwater and application thereof in repairing organic pollution of the groundwater.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a ternary micro-electrolysis ceramsite-permeable reaction wall for repairing groundwater, wherein the reaction wall comprises a first chamber, a second chamber and a third chamber which are sequentially arranged;
the first chamber and the third chamber are filled with adsorption media;
the second chamber is filled with nZVI/Al/C ceramic particles.
Preferably, the filling thickness of the first chamber and the third chamber is 0.1-0.2m, and the filling thickness of the third chamber is 0.3m. Wherein the description of the "filling thickness" of the chamber refers to the distance between two adjacent baffles in the direction of water flow.
Preferably, the chambers are separated by a partition, the thickness of the partition being 0.1mm.
Preferably, the adsorption medium comprises one of gravel, zeolite, and limestone.
Preferably, the particle size of the adsorption medium is 0.3-0.5mm; the grain diameter of the nZVI/Al/C ceramsite is 15-20mm.
Preferably, the preparation method of the nZVI/Al/C ceramsite comprises the following steps:
mixing iron powder, aluminum powder and activated carbon powder, performing ball milling for 24 hours under nitrogen atmosphere to obtain nZVI/Al/C, mixing and stirring with bentonite, fly ash and water, extruding and granulating, and drying and calcining to obtain the nZVI/Al/C ceramsite.
Preferably, the mass ratio of the iron powder to the aluminum powder to the active carbon is 1:1:1;
preferably, the mass ratio of the nZVI/Al/C, the bentonite and the fly ash is 5:4:1.
Preferably, the ball milling medium comprises absolute ethanol.
In the ball milling process, the ratio of the grinding balls to the raw materials is 50:1, and the revolution is 800r/min.
Preferably, the drying is carried out under a nitrogen atmosphere at 105 ℃ for 2 hours for molding.
Preferably, the calcination is calcination at 900 ℃ for 0.5h under a reducing atmosphere.
Preferably, the particle sizes of the iron powder and the aluminum powder are 100-200 meshes.
Preferably, the particle size of the granulate is 15-20mm.
The beneficial effects are that: according to the invention, the micro-electrolysis technology is combined with the PRB wall to obtain the ternary micro-electrolysis ceramsite-PRB, so that an effective groundwater PFOA in-situ repair technology is formed, and the method has important significance for guaranteeing the water environment health and the water supply safety. The invention adopts active carbon powder to load nanoscale zero-valent iron powder and aluminum powder, and simultaneously obtains the ternary micro-electrolysis ceramsite through granulation. The micro-electrolysis reaction belongs to exothermic reaction, and the water temperature of the underground water is generally about 15 ℃, which is more favorable for the micro-electrolysis reaction. Meanwhile, the first chamber and the third chamber are filled with one of gravel, zeolite or limestone, and are compounded with nano zero-valent iron/aluminum/carbon ternary micro-electrolysis ceramic particles (nZVI/Al/C) to form the permeable reaction wall, so that the defects that PRB is easy to block and easy to run off in the traditional nZVI method are overcome. Compared with the adsorption effect of single PRB media such as active carbon, limestone, zeolite and the like, the filling medium can realize the continuous degradation of organic pollutants in groundwater.
An application of a ternary micro-electrolysis ceramsite-permeable reactive barrier for repairing groundwater in repairing organic pollution of groundwater.
The organic contamination is PFOA contamination.
Preferably, the application comprises the steps of:
introducing PFOA sewage, and carrying out small amount of adsorption in the first chamber; after passing through the second chamber, chemical degradation occurs; and when the wastewater passes through the third chamber, the final product fluoride ions generated by degradation and the intermediate product containing fluoride are adsorbed, so that the wastewater is purified.
The main function of the medium filled in the first chamber of the ternary micro-electrolysis ceramsite-permeable reactive barrier (nZVI/Al/C-PRB) provided by the invention is to adsorb part of inorganic pollutants; the nZVI/Al/C ceramsite of the second chamber is a main reaction medium and mainly used for degrading organic pollutants in groundwater through a micro-electrolysis field constructed by Fe, al and C; the medium in the third chamber is mainly used for adsorbing and removing the final degradation products or intermediate products of pollutants in the water after passing through the second chamber.
Compared with the prior art, the invention has the following advantages and technical effects:
the invention takes the conventional adsorption material (gravel, zeolite and limestone) and the micro-electrolysis ceramsite as the PRB wall medium, not only can realize the adsorption of pollutants, but also can degrade organic pollutants such as PFOA in underground water, and the intermediate products which are not completely degraded can be removed by adsorption through the adsorption medium of the third chamber; secondly, the adopted micro-electrolysis ceramsite is nZVI/Al/C ternary micro-electrolysis ceramsite, has stronger reaction capacity compared with the traditional binary micro-electrolysis filler, and is more beneficial to generating micro-electrolysis effect aiming at the low-temperature condition of underground water, thereby being more beneficial to the degradation of pollutants; in addition, the nZVI/Al/C ternary micro-electrolysis ceramsite is nano zero-valent iron/aluminum obtained by grinding through a ball mill, and compared with a chemical liquid phase reduction method which is generally adopted, the method does not need a large amount of reducing agent, and fewer raw materials are needed, so that the cost is lower. Meanwhile, granulation is carried out through high-temperature calcination, so that the problem that nano zero-valent iron and aluminum are easy to run off is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, illustrate and explain the application and are not to be construed as limiting the application. In the drawings:
FIG. 1 is a schematic diagram of the structure of a ternary micro-electrolysis ceramic-permeable reactive barrier (nZVI/Al/C-PRB) in example 1 of the present invention; wherein the arrow direction is the water flow direction.
Reference numerals illustrate: 1-a first separator, 2-a gravel layer and 3-nZVI/Al/C ceramic particle layer.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
The particle size of the iron powder and the aluminum powder used in the embodiment of the invention is 100-200 meshes, and the purity is more than 99%.
Example 1
A ternary micro-electrolysis ceramsite-permeable reactive barrier for repairing organic pollution of underground water, as shown in figure 1, comprises a first chamber, a second chamber and a third chamber which are sequentially arranged.
Gravel (particle size 0.3-0.5 mm) is filled in the first chamber and the third chamber, and the filling thickness is 0.15m; and filling the nZVI/Al/C ternary micro-electrolysis ceramic particles into the second chamber, wherein the filling thickness is 0.3m.
The preparation method of the nZVI/Al/C ternary micro-electrolysis ceramsite comprises the following steps:
(1) Weighing 5g of iron powder, 5g of aluminum powder and 5g of active carbon powder respectively, taking 750g of stainless steel grinding balls as grinding media, putting the grinding media into a ball milling tank, adding a small amount of absolute ethyl alcohol (the specific dosage is determined according to the total amount of substances to be ground), and grinding for 24 hours at a speed of 800r/min under a nitrogen atmosphere to obtain active carbon-loaded nano zero-valent iron/aluminum (nZVI/Al/C);
(2) Weighing 12g of bentonite and 3g of fly ash, mixing with the nZVI/Al/C, adding water, mixing and stirring (the adding amount of the water is used for fully wetting all solid components, and the mixture is suitable for kneading by hands to form a mass, and the following steps are the same), extruding the mass into a granulated raw material with the particle size of 15-20mm, drying the obtained raw material for 2h in a nitrogen atmosphere at 105 ℃ for molding, and then placing the raw material into a reducing atmosphere furnace for calcining at 900 ℃ for 0.5h to obtain the nZVI/Al/C ceramsite with the particle size of 15-20mm.
After the reaction wall is filled, artificially configured PFOA simulated wastewater is continuously introduced into the nZVI/Al/C-PRB, so that water flows sequentially pass through the first chamber, the second chamber and the third chamber, the hydraulic retention time is set to be 24 hours, the PFOA concentration is 0.5mg/L, water is collected at an outlet every day, and the PFOA removal rate can be stabilized to be more than 90% within 45 days of operation.
Example 2
A ternary micro-electrolysis ceramsite-permeable reaction wall for repairing organic pollution of underground water comprises a first chamber, a second chamber and a third chamber which are sequentially arranged;
the first chamber and the third chamber are filled with zeolite (particle size 0.3-0.5 mm) with filling thickness 0.1m; and filling the nZVI/Al/C ternary micro-electrolysis ceramic particles into the second chamber, wherein the filling thickness is 0.1m.
The preparation method of the nZVI/Al/C ternary micro-electrolysis ceramsite comprises the following steps:
(1) Weighing 10g of iron powder, 10g of aluminum powder and 10g of active carbon powder respectively, taking 1500g of stainless steel grinding balls as grinding media, putting the grinding media into a ball milling tank, adding a small amount of absolute ethyl alcohol at the same time, and grinding for 24 hours at the speed of 800r/min under the nitrogen atmosphere to obtain active carbon-loaded nano zero-valent iron/aluminum (nZVI/Al/C);
(2) Weighing 24g of bentonite and 6g of fly ash, mixing with the nZVI/Al/C, adding water, mixing, stirring, extruding into granular raw material with the particle size of 15-20mm, drying the obtained raw material for 2h in a nitrogen atmosphere at 105 ℃ for molding, and then placing the raw material into a reducing atmosphere furnace for calcining at 900 ℃ for 0.5h to obtain the nZVI/Al/C ceramsite with the particle size of 15-20mm.
After the reaction wall is filled, artificially configured PFOA simulated wastewater is continuously introduced into the nZVI/Al/C-PRB, the hydraulic retention time is set to be 24 hours, wherein the PFOA concentration is 50mg/L, water is collected at an outlet every day, and the PFOA removal rate can be stabilized to be about 70% within 45 days of operation.
Example 3
A ternary micro-electrolysis ceramsite-permeable reaction wall for repairing organic pollution of underground water comprises a first chamber, a second chamber and a third chamber which are sequentially arranged;
limestone (particle size 0.3-0.5 mm) is filled in the first chamber and the third chamber, and the filling thickness is 0.1m; and filling the nZVI/Al/C ternary micro-electrolysis ceramic particles into the second chamber, wherein the filling thickness is 0.3m.
The preparation method of the nZVI/Al/C ternary micro-electrolysis ceramsite comprises the following steps:
(1) Weighing 10g of iron powder, 10g of aluminum powder and 10g of active carbon powder respectively, taking 1500g of stainless steel grinding balls as grinding media, putting the grinding media into a ball milling tank, adding a small amount of absolute ethyl alcohol at the same time, and grinding for 24 hours at the speed of 800r/min under the nitrogen atmosphere to obtain active carbon-loaded nano zero-valent iron/aluminum (nZVI/Al/C);
(2) Weighing 24g of bentonite and 6g of fly ash, mixing with the nZVI/Al/C, adding water, mixing, stirring, extruding into granular raw material with the particle size of 15-20mm, drying the obtained raw material for 2h in a nitrogen atmosphere at 105 ℃ for molding, and then placing the raw material into a reducing atmosphere furnace for calcining at 900 ℃ for 0.5h to obtain the nZVI/Al/C ceramsite with the particle size of 15-20mm.
After the reaction wall is filled, artificially configured PFOA simulated wastewater is continuously introduced into the nZVI/Al/C-PRB, the hydraulic retention time is set to be 24 hours, wherein the PFOA concentration is 50mg/L, water is collected at an outlet every day, and the PFOA removal rate can be stabilized to be about 64% within 45 days of operation.
Comparative example 1
A ternary micro-electrolysis ceramsite-permeable reactive barrier for repairing organic pollution of groundwater, which is different from example 1 in that the filler in the second chamber is replaced with common activated carbon particles.
After the reaction wall is filled, artificially configured PFOA simulated wastewater is continuously introduced into the C-PRB, the hydraulic retention time is set to be 24 hours, wherein the PFOA concentration is 50mg/L, water is collected at an outlet every day, and the PFOA removal rate can be kept above 80% in the first 12 days of the reaction within 45 days of operation; however, since the activated carbon particles only adsorb about, the later adsorption gradually reaches saturation, so that the removal rate gradually decreases, and the removal rate is only 13% on the 45 th day.
The foregoing is merely a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. The ternary micro-electrolysis ceramsite-permeable reaction wall for repairing underground water is characterized by comprising a first chamber, a second chamber and a third chamber which are sequentially arranged;
the first chamber and the third chamber are filled with adsorption media;
the second chamber is filled with nZVI/Al/C ceramic particles.
2. A ternary micro-electrolysis ceramic particle-permeable reactive barrier for repairing groundwater according to claim 1, wherein the first chamber and the third chamber are filled with 0.1-0.2m, and the third chamber is filled with 0.3m.
3. A ternary micro-electrolysis ceramic particle-permeable reactive barrier for repairing groundwater according to claim 1, wherein the chambers are separated by a spacer, the spacer having a thickness of 0.1mm.
4. A ternary micro-electrolysis ceramic particle-permeable reactive barrier for repairing groundwater according to claim 1, wherein the particle size of the adsorption media is 0.3-0.5mm, and the adsorption media comprises one of gravel, zeolite, and limestone.
5. A ternary micro-electrolysis ceramsite-permeable reactive barrier for repairing groundwater according to claim 1, wherein the size of the nZVI/Al/C ceramsite is 15-20mm;
the preparation method of the nZVI/Al/C ceramsite comprises the following steps:
mixing iron powder, aluminum powder and activated carbon powder, performing ball milling for 24 hours under nitrogen atmosphere to obtain nZVI/Al/C, mixing and stirring with bentonite, fly ash and water, extruding and granulating, and drying and calcining to obtain the nZVI/Al/C ceramsite.
6. The ternary micro-electrolysis ceramic particle-permeable reactive barrier for repairing groundwater according to claim 5, wherein the mass ratio of the iron powder, the aluminum powder and the activated carbon is 1:1:1.
7. The ternary micro-electrolysis ceramic particle-permeable reactive barrier for repairing groundwater according to claim 5, which is characterized in thatCharacterized in that the mass ratio of the nZVI/Al/C, the bentonite and the fly ash is 5:4:1 。
8. The ternary micro-electrolysis ceramic particle-permeable reactive barrier for repairing groundwater according to claim 5, wherein the drying is performed for 2 hours at 105 ℃ under nitrogen atmosphere.
9. A ternary micro-electrolysis ceramic particle-permeable reactive barrier for repairing groundwater according to claim 5, wherein the calcination is performed in a reducing atmosphere at 900 ℃ for 0.5h.
10. Use of a ternary micro-electrolysis ceramic particle-permeable reactive barrier for remediation of groundwater according to any one of claims 1 to 9, for remediation of organic contamination of groundwater.
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