CN115626680A - Permeable reactive barrier and method for removing new pollutants in underground water by using same - Google Patents

Permeable reactive barrier and method for removing new pollutants in underground water by using same Download PDF

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CN115626680A
CN115626680A CN202211166638.3A CN202211166638A CN115626680A CN 115626680 A CN115626680 A CN 115626680A CN 202211166638 A CN202211166638 A CN 202211166638A CN 115626680 A CN115626680 A CN 115626680A
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layer
adsorption
reactive barrier
permeable reactive
beta
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周彦波
周易
凌良雄
李霞
王鑫
陈鑫雨
汪彤
贺怡灵
高明
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East China University of Science and Technology
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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
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
    • 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
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
    • B01J20/26—Synthetic macromolecular compounds
    • B01J20/262—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon to carbon unsaturated bonds, e.g. obtained by polycondensation
    • 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
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by 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
    • C02F1/722—Oxidation by peroxides
    • 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
    • C02F2101/345—Phenols
    • 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
    • C02F2101/38—Organic compounds containing nitrogen
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/02—Specific form of oxidant
    • C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical

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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)
  • Inorganic Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

The invention provides a permeable reactive barrier and a method for removing new pollutants in underground water by using the permeable reactive barrier, the method leads the underground water to sequentially pass through an adsorption-oxidation layer, a slow oxygen release layer and a safety layer of the permeable reactive barrier, wherein the adsorption-oxidation layer comprises citric acid cross-linked beta-cyclodextrin polymer and delta-MnO 2 The slow oxygen release layer comprisesCaO 2 And coarse sand, the safety layer comprises a molecular sieve and quartz sand; firstly, adsorbing and enriching new pollutants by citric acid cross-linked beta-cyclodextrin polymer (CD-CA), and adding trace manganese oxide (delta-MnO) 2 ) Construction of adsorption + oxidation technique using delta-MnO 2 Surface intermediate valence state manganese activates molecular oxygen to generate superoxide radical (O) 2 ‑ ) Degrading new pollutants while adding calcium peroxide (CaO) 2 ) Coarse sand ensures the continuous existence of molecular oxygen in the system to improve delta-MnO 2 The utilization efficiency of the manganese Mn (III) with the intermediate valence state on the surface is improved, so that the new pollutants are treated efficiently and durably; and use CaO 2 The generated alkaline environment and the molecular sieve and the quartz sand are used as insurance measures to recover the dissolved manganese, thereby completing the invention.

Description

Permeable reactive barrier and method for removing new pollutants in underground water by using same
Technical Field
The invention relates to the technical field of environmental management.
Background
New contaminants refer to chemicals not included in routine environmental monitoring, but which may enter the environment and cause known or potential negative ecological or health effects. Including Pharmaceuticals and Personal Care Products (PPCP), endocrine disruptant nothing (EDC), persistent Organic Pollutants (POPs), and microplastics in general. As environmental monitoring technologies develop and the awareness of the environmental and health hazards of chemical substances deepens, more and more new pollutants are identified. Therefore, the search for a high-efficiency new pollutant surface/underground water treatment method is a problem which needs to be solved in the field of environmental pollution prevention and control.
New pollutant treating technology includes biological process, adsorption process, chemical process, etc. The principle of the biological method is to decompose new pollutants by using microorganisms, and the biological method is divided into an aerobic biological method and an anaerobic biological method and has the advantage of environmental protection. However, the biological method has the characteristics of long degradation period and low degradation efficiency due to the toxic effect of the new pollutants on the microorganisms. The adsorption method has the advantages of simple operation, low investment cost and regeneration and utilization, and is commonThe adsorbent comprises montmorillonite, modified bentonite, activated carbon, macrocyclic compound, etc. In recent years, macrocyclic compounds have been increasingly studied as a supramolecular polymer in the field of adsorption. The chemical method includes electrochemical method, photocatalytic method, chemical oxidation method, and the like. Among them, the chemical oxidation method is receiving more and more attention due to its advantages such as thorough removal effect and fast reaction rate. Common oxidants include H 2 O 2 、O 3 The composite material comprises chlorine dioxide, a manganese-based oxidant and the like, wherein the manganese-based oxidant has the advantages of wide source, low price, variable valence state and strong oxidizing capability, and is widely applied to treatment of organic pollutants in water.
In practical applications, the removal of new contaminants by adsorption is subject to multiple limitations. First, adsorption is a physical process and does not fundamentally eliminate new contaminants. Secondly, the actual water quality can interfere the adsorption of the adsorbent to new pollutants, and the pores of the adsorbent are easy to block, so that the adsorption efficiency is reduced.
Meanwhile, the manganese-based oxidant can generate multi-valence manganese in the process of oxidizing and degrading new pollutants, and the intermediate-valence manganese has higher catalytic oxidation capacity and can basically complete reaction in a shorter time, so that the utilization efficiency of the intermediate-valence manganese is lower. However, in actual groundwater remediation processes, it is desirable that the oxidizing agent be able to act slowly over a long period of time. Meanwhile, similar to other metal-based oxidants, manganese-based oxidants inevitably dissolve and leak manganese ions in the use process, and the leakage rises with the decrease of pH, for example, the content of manganese ions in acidic mineral water is up to dozens of milligrams per liter, which poses serious threats to human health and ecological environment.
The invention aims to overcome the defects of the prior art and provides a method for removing new pollutants in underground water by using a permeable reactive barrier. The technology firstly adsorbs and enriches new pollutants through citric acid cross-linked beta-cyclodextrin polymer (CD-CA), and adds trace manganese oxide (delta-MnO) 2 ) Construction of adsorption + oxidation technique using delta-MnO 2 Surface intermediate valence state manganese activates molecular oxygen to generate superoxide radical (O) 2 - ) Degrade new pollutants at the same timeAdding calcium peroxide (CaO) 2 ) And coarse sand ensures that molecular oxygen is continuously present in the system to improve delta-MnO 2 The utilization efficiency of the surface intermediate valence state manganese Mn (III) is improved, thereby realizing the high-efficiency and durable treatment of new pollutants. And use of CaO 2 The generated alkaline environment and the molecular sieve and the quartz sand are used as insurance measures to recover the dissolved manganese, thereby completing the invention.
The method ensures that the CD-CA adsorbent meets the high-efficiency adsorption enrichment efficiency of new pollutants under different water quality conditions in the process of treating the new pollutants in the underground water; adding a trace amount of delta-MnO 2 Activating; with addition of CaO 2 The continuous existence of molecular oxygen in the system is ensured, the activation effect of the oxidant is enhanced, and the high-efficiency and durable treatment of new pollutants is realized; caO (CaO) 2 An alkaline environment can be provided in underground water, so that dissolved manganese ions in the system can be adjusted; the molecular sieve and the quartz sand are used as safety measures to recover the residual dissolved manganese, so that secondary pollution of underground water is avoided, and green treatment of new pollutants in the underground water is realized.
Disclosure of Invention
In order to realize the invention, the method specifically comprises the following scheme:
a permeable reactive barrier, the said reactive barrier includes the absorption-oxide layer and slow release oxygen layer that are laminated sequentially; the slow oxygen release layer comprises CaO 2 And coarse sand; the adsorption-oxidation layer comprises citric acid cross-linked beta-cyclodextrin polymers CD-CA and delta-MnO 2 (ii) a The CD-CA is prepared by the following method:
beta-cyclodextrin (beta-CD), anhydrous Citric Acid (CA) and deionized water are used as raw materials, potassium dihydrogen phosphate is added to be used as a catalyst, and the citric acid cross-linked beta-cyclodextrin polymer (CD-CA) is obtained through the processes of drying, water washing and the like.
Further, caO in the slow oxygen release layer 2 And grit at a mass ratio of 3 2 The mass ratio of (1) to (3).
Further, the CD-CA is prepared by the following method, and is characterized by comprising the following specific preparation steps:
(1) Weighing a certain amount of beta-cyclodextrin (beta-CD) and anhydrous Citric Acid (CA) at room temperature, respectively adding potassium dihydrogen phosphate and deionized water, and ultrasonically dispersing uniformly;
(2) Heating the solution obtained in the step 1 to react completely to obtain a solid product;
(3) After cooling to room temperature, the product was washed with deionized water and dried.
Further, the CD-CA is prepared by the following method: the method is characterized in that: in step (1), the mass ratio of the beta-cyclodextrin (beta-CD) to the anhydrous Citric Acid (CA) to the monopotassium phosphate is 4: 4.5L.
Further, the CD-CA is prepared by the following method: the method is characterized in that: the heating temperature in the step (2) is 140 ℃, and the reaction time is 3.0h; further preferably, the drying temperature in step (3) is 30 ℃ to 40 ℃.
Furthermore, the reaction wall comprises an adsorption-oxidation layer, a slow oxygen release layer and a safety layer which are sequentially stacked, wherein the safety layer comprises a molecular sieve and quartz sand.
Further, the particle size of quartz sand filler in the safety layer is 20 meshes, the particle size of the molecular sieve is 3mm, the mass ratio of the quartz sand to the molecular sieve is 3; further preferably, the thickness of the slow oxygen release layer is 10cm, and the thickness of the adsorption-catalysis layer is 20cm.
Further, the method for removing the new pollutants in the underground water by the reaction wall enables the underground water to sequentially pass through the adsorption-oxidation layer and the slow oxygen release layer of the permeable reaction wall; or an adsorption-oxidation layer, a slow oxygen release layer and a safety layer.
The invention has the beneficial technical effects
(1) The CD-CA adsorbent provided by the invention has the advantages of low preparation cost, simple operation, good buffering capacity, good adsorption and enrichment efficiency for new pollutants in a wide pH range (3.0-10.0), and good anti-interference capability.
(2) The adsorption-oxidation layer laid on the permeable reactive wall has good adsorption and catalytic oxidation degradation performances, so that the problem of pore blockage of the adsorbent is relieved to a certain extent, and new pollutants in underground water are eliminated fundamentally.
(3) The slow oxygen release layer laid on the permeable reactive barrier provided by the invention has good support performance and can play a role of slowly releasing oxygen, so that the system can be ensured to efficiently and persistently generate superoxide radicals to degrade new pollutants in underground water, and the utilization efficiency of the intermediate valence state manganese in the permeable reactive barrier is improved.
(4) The permeable reactive barrier provided by the invention is paved with the slow oxygen release layer and the safety layer with specific composition performance, and CaO is utilized 2 The provided alkaline environment and the interception effect of the molecular sieve and the quartz sand can efficiently recover the dissolved manganese, and green restoration of new pollutants in underground water can be realized.
Drawings
FIG. 1 is a schematic view of permeable reactive barrier of the present invention for removing new contaminants from water
Detailed description of the preferred embodiments
The present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to these examples within the scope not exceeding the gist thereof.
The invention provides a permeable reactive barrier and a method for removing new pollutants in underground water by using the permeable reactive barrier, the method leads the underground water to sequentially pass through an adsorption-oxidation layer, a slow oxygen release layer and a safety layer of the permeable reactive barrier, wherein the adsorption-oxidation layer comprises citric acid cross-linked beta-cyclodextrin polymer and delta-MnO 2 The slow oxygen release layer comprises CaO 2 The safety layer comprises a molecular sieve and quartz sand; firstly, adsorbing and enriching new pollutants by citric acid cross-linked beta-cyclodextrin polymer (CD-CA), and adding trace manganese oxide (delta-MnO) 2 ) Construction of adsorption + oxidation technique using delta-MnO 2 Surface intermediate valence state manganese activates molecular oxygen to generate superoxide radical (O) 2 - ) Degrading new pollutants while adding calcium peroxide (CaO) 2 ) Coarse sand ensures the continuous existence of molecular oxygen in the system to improve delta-MnO 2 The utilization efficiency of the surface intermediate valence state manganese Mn (III) is realized, thereby realizing the new pollutionThe object is treated efficiently and durably; and use of CaO 2 The generated alkaline environment and the molecular sieve and the quartz sand are used as insurance measures to recover the dissolved manganese, thereby completing the invention.
Example 1
Referring to fig. 1, a permeable reactive barrier provided by the invention is used for repairing groundwater polluted by a new pollutant, a wall body is arranged in a direction perpendicular to a water flow direction, a safety layer with the thickness of 15cm is laid at the bottom, a slow oxygen release layer with the thickness of 10cm is laid, and an adsorption-oxidation layer with the thickness of 20cm is laid.
The mass ratio of the quartz sand to the molecular sieve in the safety layer is 3.
CaO in the slow oxygen release layer 2 The mass ratio of the coarse sand to the coarse sand is 1.
The preparation method of the citric acid crosslinked beta-cyclodextrin polymer (CD-CA) comprises the following steps: weighing a certain amount of beta-cyclodextrin (beta-CD) and anhydrous Citric Acid (CA), respectively adding potassium dihydrogen phosphate and deionized water, and performing ultrasonic treatment until the mixture is completely dissolved. The mixed solution reacts for 3.0h in a digital display air dry box at the temperature of 140 ℃ to obtain a solid product. When the temperature is reduced to room temperature, washing the mixture for 5 times by using deionized water, removing impurities, and drying the mixture at the temperature of between 30 and 40 ℃ to constant weight. The amounts of reagents used were: 200g of beta-CD, 100g of CA, 50g of monopotassium phosphate and 4.5L of deionized water. The properties of the complex are: BET surface area 0.8m 2 (g), sedimentation time 1min, pore volume 0.001608cm 3 The water absorption capacity is 1.091g/g, and the water absorption volume is 1.091cm 3 /g。
Adsorption of CD-CA and delta-MnO in oxide layer 2 The mass ratio of (1) to (1) is uniformly mixed to be used as a filling material of the adsorption-oxidation layer.
The content of bisphenol A (BPA) in the polluted underground water is 10mg/L, the polluted underground water flows through the permeable reactive barrier provided by the invention, and the effluent and the inlet of the polluted underground water are respectively sampled, analyzed and detected after running for 12 hours. The result shows that the BPA removal efficiency can reach about 60 percent.
Example 2
Referring to fig. 1, the permeable reactive barrier provided by the invention is used for repairing underground water polluted by a new pollutant, a wall body is arranged in the direction vertical to the water flow, a safety layer with the thickness of 15cm is firstly paved at the bottom, a slow oxygen release layer with the thickness of 10cm is paved, and an adsorption-oxidation layer with the thickness of 20cm is paved at last.
The mass ratio of the quartz sand to the molecular sieve in the safety layer is 3.
CaO in slow-release oxygen layer 2 The mass ratio of the coarse sand to the coarse sand is 3.
The preparation method of the citric acid crosslinked beta-cyclodextrin polymer (CD-CA) comprises the following steps: weighing a certain amount of beta-cyclodextrin (beta-CD) and anhydrous Citric Acid (CA), respectively adding potassium dihydrogen phosphate and deionized water, and performing ultrasonic treatment until the mixture is completely dissolved. The mixed solution reacts for 3.0h in a digital display air dry box at the temperature of 140 ℃ to obtain a solid product. When the temperature is reduced to room temperature, the mixture is washed for 5 times by deionized water, impurities are removed, and the mixture is dried to constant weight at the temperature of 30-40 ℃. The amounts of reagents used were: 200g of beta-CD, 100g of CA, 50g of monopotassium phosphate and 4.5L of deionized water. The properties of the complex are: BET surface area 0.8m 2 (g), sedimentation time 1min, pore volume 0.001608cm 3 G, water absorption capacity of 1.091g/g and water absorption volume of 1.091cm 3 /g。
Adsorption of CD-CA and delta-MnO in oxide layer 2 The mass ratio of (1) to (1) is uniformly mixed to be used as a filling material of the adsorption-oxidation layer.
The content of bisphenol A (BPA) in the polluted underground water is 10mg/L, the polluted underground water flows through the permeable reactive barrier provided by the invention, and the effluent and the inlet of the polluted underground water are respectively sampled, analyzed and detected after running for 12 hours. The result shows that the BPA removal efficiency can reach about 71.3 percent.
Example 3
The difference from example 1 is that: adsorption of CD-CA and delta-MnO in oxide layer 2 The mass ratio of (1) is 3. After the treatment for the same time, the result shows that the removal efficiency of BPA can reach about 85.4%.
Example 4
The difference from example 2 is that: adsorption of CD-CA and delta-MnO in oxide layer 2 In a mass ratio ofAnd 3, uniformly mixing the components to obtain the filler of the adsorption-oxidation layer. After the treatment for the same time, the result shows that the removal efficiency of BPA can reach about 97.4%.
Example 5
The difference from example 4 is that: the content of Parachlorometaxylenol (PCMX) in the polluted underground water is 10mg/L, the polluted underground water flows through the permeable reactive barrier provided by the invention, and the effluent and the inlet of the polluted underground water are respectively sampled, analyzed and detected after running for 12 hours. After the treatment for the same time, the result shows that the removal efficiency of the PCMX can reach 100 percent.
Example 6
The same as example 4, except that: the content of Sulfanilamide (SA) in the polluted underground water is 10mg/L, the polluted underground water flows through the permeable reactive barrier provided by the invention, and the effluent and the inlet water of the polluted underground water are respectively sampled, analyzed and detected after running for 12 hours. After the same time treatment, the result shows that the SA removal efficiency can reach about 98.1%.
Example 7
The difference from example 4 is that: the permeable reactive wall body is only paved with a slow oxygen release layer and an adsorption-oxidation layer. After the treatment for the same time, the result shows that the removal efficiency of BPA reaches about 90.3%.
Comparative example 1
The same as example 4, except that: the permeable reactive wall body is only paved with a safety layer. After the treatment for the same time, the result shows that the removal efficiency of BPA only reaches about 10.4 percent.
Comparative example 2
The difference from example 4 is that: only a safety layer and a slow oxygen release layer are laid on the permeable reactive wall. After the treatment for the same time, the result shows that the removal efficiency of BPA only reaches about 15.2 percent.
Comparative example 3
The difference from example 4 is that: the permeable reactive wall body is only paved with a safety layer and an adsorption-oxidation layer. After the same time treatment, the result shows that the BPA removal efficiency only reaches about 52.6 percent.
Comparative example 4
The same as example 1, except that: the permeable reactive wall body is only paved with a safety layer and a slow oxygen release layer. After the same time treatment, the result shows that the BPA removal efficiency only reaches about 12.8 percent.
Comparative example 5
The same as example 1, except that: the permeable reactive wall body is only paved with a safety layer and an adsorption-oxidation layer. After the same time treatment, the result shows that the BPA removal efficiency only reaches about 47.2 percent.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention.

Claims (8)

1. A permeable reactive barrier, the said reactive barrier includes the absorption-oxide layer and slow release oxygen layer that are laminated sequentially; the slow oxygen release layer comprises CaO 2 And coarse sand; the adsorption-oxidation layer comprises citric acid cross-linked beta-cyclodextrin polymers CD-CA and delta-MnO 2 (ii) a The CD-CA is prepared by the following method:
beta-cyclodextrin (beta-CD), anhydrous Citric Acid (CA) and deionized water are used as raw materials, potassium dihydrogen phosphate is added to be used as a catalyst, and the citric acid cross-linked beta-cyclodextrin polymer (CD-CA) is obtained through the processes of drying, water washing and the like.
2. The permeable reactive barrier of claim 1, wherein CaO in the slow oxygen release layer 2 And grit at a mass ratio of 3 2 The mass ratio of (1) is 3.
3. The permeable reactive barrier of claim 1, wherein the CD-CA is prepared by the following steps:
(1) Weighing a certain amount of beta-cyclodextrin (beta-CD) and anhydrous Citric Acid (CA) at room temperature, respectively adding potassium dihydrogen phosphate and deionized water, and ultrasonically dispersing uniformly;
(2) Heating the solution obtained in the step 1 to react completely to obtain a solid product;
(3) After cooling to room temperature, the product was washed with deionized water and dried.
4. The permeable reactive barrier of claim 3, wherein the CD-CA is prepared by the following steps: the method is characterized in that: in step (1), the mass ratio of the beta-cyclodextrin (beta-CD) to the anhydrous Citric Acid (CA) to the monopotassium phosphate is 4: 4.5L.
5. The permeable reactive barrier of claim 3, wherein the CD-CA is prepared by the following steps: the method is characterized in that: the heating temperature in the step (2) is 140 ℃, and the reaction time is 3.0h; further preferably, the drying temperature in step (3) is 30 ℃ to 40 ℃.
6. The permeable reactive barrier of claim 1, comprising an adsorption-oxidation layer, a slow oxygen release layer and a safety layer, which are stacked in sequence, wherein the safety layer comprises a molecular sieve and quartz sand.
7. A permeable reactive barrier according to claim 1, wherein: the particle size of quartz sand filler in the safety layer is 20 meshes, the particle size of the molecular sieve is 3mm, the mass ratio of the quartz sand to the molecular sieve is 3; further preferably, the thickness of the slow oxygen release layer is 10cm, and the thickness of the adsorption-catalysis layer is 20cm.
8. A method for removing new pollutants from underground water by using the reaction wall of any one of claims 1 to 7, which comprises the steps of enabling the underground water to sequentially pass through an adsorption-oxidation layer and a slow oxygen release layer of the permeable reaction wall; or an adsorption-oxidation layer, a slow oxygen release layer and a safety layer.
CN202211166638.3A 2022-09-23 2022-09-23 Permeable reactive barrier and method for removing new pollutants in underground water by using same Pending CN115626680A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116639851A (en) * 2023-07-27 2023-08-25 北京科技大学 Permeable reactive barrier for in-situ restoration of groundwater and treatment method and application thereof
CN116639852A (en) * 2023-07-27 2023-08-25 北京科技大学 Permeable reactive barrier for repairing groundwater microplastic pollution and repairing method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116639851A (en) * 2023-07-27 2023-08-25 北京科技大学 Permeable reactive barrier for in-situ restoration of groundwater and treatment method and application thereof
CN116639852A (en) * 2023-07-27 2023-08-25 北京科技大学 Permeable reactive barrier for repairing groundwater microplastic pollution and repairing method thereof
CN116639851B (en) * 2023-07-27 2023-10-20 北京科技大学 Permeable reactive barrier for in-situ restoration of groundwater and treatment method and application thereof
CN116639852B (en) * 2023-07-27 2023-10-20 北京科技大学 Permeable reactive barrier for repairing groundwater microplastic pollution and repairing method thereof

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