CN113582392A - Permeable reactive barrier and method for repairing underground water pollution of landfill and polluted site - Google Patents

Permeable reactive barrier and method for repairing underground water pollution of landfill and polluted site Download PDF

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Publication number
CN113582392A
CN113582392A CN202110889448.3A CN202110889448A CN113582392A CN 113582392 A CN113582392 A CN 113582392A CN 202110889448 A CN202110889448 A CN 202110889448A CN 113582392 A CN113582392 A CN 113582392A
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China
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filler layer
filler
wall
thickness
permeable reactive
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Inventor
曾武清
马洪亭
卜庆国
张将军
胡泊
柴建伟
柴志艇
王宗林
高轩
谢嘉瑞
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Cecep Beijing Energy Saving Environmental Protection Engineering Co ltd
China Energy Conservation And Environmental Protection Group Co ltd
Tianjin University
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Cecep Beijing Energy Saving Environmental Protection Engineering Co ltd
China Energy Conservation And Environmental Protection Group Co ltd
Tianjin University
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Priority to CN202110889448.3A priority Critical patent/CN113582392A/en
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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
    • 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
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • 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
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • 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
    • C02F1/70—Treatment of water, waste water, or sewage by reduction
    • 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
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/103—Arsenic compounds
    • 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
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • 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

Abstract

The utility model provides a permeable reactive barrier and a method for landfill and pollution site groundwater pollution remediation, at least one reactive barrier module of reactive barrier, the reactive barrier module includes the module skeleton, two tip of module skeleton all are equipped with the filter screen, two it has quartz sand filler layer, fly ash filler layer, active carbon filler layer, reduced iron powder filler layer, iron modified red gold stone filler layer, active alumina filler layer, titanium white powder filler layer to fill in proper order between the filter screen. By arranging the permeable reactive barrier, groundwater polluted by arsenic, cadmium, lead and the like is repaired, so that the pollutant treatment efficiency can be improved, the treatment cost can be reduced, secondary pollution is effectively avoided, the treatment process is clean and efficient, the repairing effect is good, the stability is high, the pollution in-situ treatment is realized, large-scale engineering can be realized, and the permeable reactive barrier is suitable for treating complex environmental pollution problems.

Description

Permeable reactive barrier and method for repairing underground water pollution of landfill and polluted site
Technical Field
The disclosure relates to the technical field of ecological environment protection, in particular to a permeable reactive barrier and a permeable reactive barrier method for repairing underground water pollution of a landfill and a polluted site.
Background
With the progress of industrial development, the problem of environmental pollution is more and more emphasized by society, pollutants such as heavy metals in the soil of a polluted site enter underground water along with water circulation to cause serious environmental pollution of the underground water, wherein the pollution caused by arsenic, cadmium, lead and the like of the underground water is an important pollution factor for human health. In recent years, a great deal of research is carried out on groundwater pollution treatment at home and abroad, and certain effect is achieved, wherein the research focuses on research on pollution diffusion, solute migration along with water and transformation rules, research on pollutant removal mechanisms, engineering application research on groundwater pollution treatment and the like. Although a great deal of research is carried out on groundwater pollution control at home and abroad, the forming technology with remarkable effect has less application and practical engineering application, and particularly has less related research and engineering application on pollution caused by arsenic, cadmium, lead and the like in groundwater.
At present, the remediation technology for polluted underground water containing arsenic, cadmium, lead and the like at home and abroad mainly focuses on: flocculation technology using flocculation sedimentation as a core, exchange adsorption technology using a strong specific surface area adsorption material as a core, permeation-reverse osmosis technology using membrane permeation as a core, electrophoresis and electro-adsorption technology based on electrochemistry, redox technology based on redox, microbial technology based on microbial digestion, and the like.
In view of the existing treatment effect, the single technology is difficult to achieve the ideal effect on treating the complex environmental pollution problem. Underground water resources are important natural resources in China, and with the improvement of national requirements on environmental protection and the increasing requirements of the public on clean environment, an economic, efficient and environment-friendly efficient arsenic, cadmium, lead and other polluted underground water restoration technology without secondary pollution is urgently needed to solve the problem of complex environmental pollution.
Disclosure of Invention
In view of the above, the present disclosure is directed to a permeable reactive barrier and a method for repairing groundwater pollution in a landfill or a polluted site, so as to solve or partially solve the above technical problems.
In view of the above, the disclosure provides in a first aspect a permeable reactive barrier for groundwater pollution remediation in landfills and polluted sites, comprising: at least one reaction wall module, the reaction wall module comprising: the module comprises a hollow module framework, wherein two end parts of the module framework are respectively provided with a filter screen, and a quartz sand filling material layer, a fly ash filling material layer, an activated carbon filling material layer, a reduced iron powder filling material layer, an iron modified red gold stone filling material layer, an activated alumina filling material layer and a titanium dioxide filling material layer are sequentially filled between the filter screens.
Further, the particle size of the quartz sand filler in the quartz sand filler layer is 10-20 meshes; the particle size of the coal ash filler in the coal ash filler layer is 10-20 meshes; the particle size of the active carbon filler in the active carbon filler layer is 20-40 meshes; the particle size of the reduced iron powder filler in the reduced iron powder filler layer is 20-40 meshes; the particle size of the iron modified rubble filler in the iron modified rubble filler layer is 20-40 meshes; the particle size of the active alumina filler in the active alumina filler layer is 20-40 meshes; the particle size of the titanium dioxide filler in the titanium dioxide filler layer is 20-40 meshes.
Further, the thickness of the quartz sand filler layer is 7-10cm, the thickness of the coal ash filler layer is 7-10cm, the thickness of the activated carbon filler layer is 2-6cm, the thickness of the reduced iron powder filler layer is 7-10cm, the thickness of the iron modified red gold stone filler layer is 2-6cm, the thickness of the activated alumina filler layer is 2-6cm, and the thickness of the titanium dioxide filler layer is 2-6 cm.
Further, the thickness of the quartz sand filler layer is 8cm, the thickness of the coal ash filler layer is 8cm, the thickness of the activated carbon filler layer is 4cm, the thickness of the reduced iron powder filler layer is 8cm, the thickness of the iron-modified ruby filler layer is 4cm, the thickness of the activated alumina filler layer is 4cm, and the thickness of the titanium dioxide filler layer is 4 cm.
The reaction wall module comprises a first wall, a second wall and a third wall which are sequentially connected, wherein the first wall, the second wall and the third wall are formed by sequentially stacking a plurality of reaction wall modules.
Furthermore, the first wall, the second wall and the third wall are sequentially connected to form a wall body with an opening at one side.
Furthermore, an included angle between the first wall and the second wall is an obtuse angle, and an included angle between the second wall and the third wall is an obtuse angle.
Further, the wall body of the permeable reactive wall faces the pollution plume and is arranged in a type of'. sub..
Further, the wall body of the permeable reactive barrier covers and exceeds the pollutant plume intercepting surface by 20% or more.
Further, the laying depth of the permeable reactive barrier is continuously laid to the bedrock from the ground.
Further, the module skeleton is preferably a cylindrical tube structure.
Further, the module framework is preferably a stainless steel tube with the diameter D of 20 mm.
Further, the length × width × height of the module skeleton is preferably 1.0 × 0.4 m.
Further, the filter screen is preferably a stainless steel screen with a pore size of 60 meshes.
Based on the same inventive concept, the second aspect of the present disclosure provides a method for repairing groundwater pollution in a landfill and a polluted site, comprising: any permeable reactive wall provided by the second aspect of the present disclosure is arranged at the tail end of the pollution plume.
Further, the quartz sand filling material layer is arranged close to the tail end of the pollution plume.
Further, still include: preparing the quartz sand filler, preparing the fly ash filler, preparing the activated carbon filler, preparing the reduced iron powder filler, preparing the iron-modified rutile filler, preparing the activated alumina filler and preparing the titanium dioxide filler.
Further, the preparation process of the quartz sand filler comprises the following steps: the quartz sand is crushed and screened, and the quartz sand with the specification of 10-20 meshes is selected as a quartz sand filling material.
Further, the preparation process of the fly ash filler comprises the following steps: the fly ash is crushed and screened, and the fly ash with the specification of 10-20 meshes is selected as an active carbon filling material.
Further, the preparation process of the activated carbon filler comprises the following steps: activated carbon of 20-40 meshes is selected as the activated carbon filler.
Further, the preparation process of the reduced iron powder filler comprises the following steps: and iron powder of 20-40 meshes is selected as the filler of the reduced iron powder.
Further, the preparation process of the iron modified rutile filler comprises the following steps:
crushing and screening the rutile to obtain crushed rutile;
adding FeCl into the crushed red gold ore3And mixing and stirring the solution, and drying to obtain the iron modified rutile filler.
Further, the crushed rutile and FeCl3The weight ratio of the solution was 2: 1.
Further, the mixing intensity is 20r/min, and the mixing time is 24 h.
Further, the preparation process of the active alumina filler comprises the following steps: the active alumina is crushed and screened, and the active alumina with the specification of 20-40 meshes is selected as an active alumina filling material.
Further, the preparation process of the titanium dioxide filler comprises the following steps: titanium dioxide powder with 20-40 meshes is selected as the titanium dioxide powder filling material.
From the above, according to the permeable reactive barrier and the method for repairing groundwater pollution in a landfill and a polluted site provided by the disclosure, by arranging the permeable reactive barrier, using the compound of various materials as the filling material of the permeable reactive barrier, and by the combined action of layered filtration, exchange adsorption, chemical precipitation and the like of the filling material, the groundwater polluted by arsenic, cadmium, lead and the like is repaired, so that the pollutant treatment efficiency can be improved, the treatment cost can be reduced, secondary pollution is effectively avoided, the treatment process is clean and efficient, the repairing effect is good, the stability is high, the in-situ treatment of pollution is realized, the large-scale engineering can be realized, and the permeable reactive barrier and the method are suitable for treating the complicated environmental pollution problem.
Drawings
In order to more clearly illustrate the technical solutions in the present disclosure or related technologies, the drawings needed to be used in the description of the embodiments or related technologies are briefly introduced below, and it is obvious that the drawings in the following description are only embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a reaction wall module according to an embodiment of the present disclosure;
FIG. 2 is a schematic view of a permeable reactive barrier for groundwater pollution remediation in a landfill and a polluted site according to an embodiment of the present disclosure;
FIG. 3 is a top view of an installation layout of a permeable reactive wall of an embodiment of the present disclosure;
fig. 4 is a schematic flow chart of a method for remediating groundwater pollution of a landfill and a polluted site according to an embodiment of the present disclosure.
In the figure, 1, a reaction wall module; 11. a quartz sand filling material layer; 12. a fly ash filling material layer; 13. an active carbon filling material layer; 14. reducing the iron powder filling material layer; 15. an iron-modified rubble filler layer; 16. an active alumina filler layer; 17. titanium dioxide filling material; 18. a module skeleton; 19. filtering with a screen; A. the surface close to the pollution feather; B. the surface close to the pollution feather;
2. a first wall; 3. a second wall; 4. a third wall; 5. and (5) a polluted water quality monitoring sampling point.
Detailed Description
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
It is to be noted that technical terms or scientific terms used in the embodiments of the present disclosure should have a general meaning as understood by those having ordinary skill in the art to which the present disclosure belongs, unless otherwise defined. The use of "first," "second," and similar terms in the embodiments of the disclosure is not intended to indicate any order, quantity, or importance, but rather to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
Example 1
Referring to fig. 1, the present disclosure provides a permeable reactive barrier for groundwater pollution remediation in landfills and polluted sites, comprising a reactive barrier module 1, the reactive barrier module comprising: the module comprises a hollow module framework 18, wherein two end parts of the module framework 18 are respectively provided with a filter screen 19, and a quartz sand filling material layer 11, a fly ash filling material layer 12, an activated carbon filling material layer 13, a reduced iron powder filling material layer 14, an iron modified red gold stone filling material layer 15, an activated alumina filling material layer 16 and a titanium dioxide filling material layer 17 are sequentially filled between the two filter screens 19.
Wherein, the particle size of the quartz sand filler in the quartz sand filler layer 11 is 10 meshes; the particle size of the fly ash filler in the fly ash filler layer 12 is 10 meshes; the particle size of the active carbon filler in the active carbon filler layer 13 is 20 meshes; the particle size of the reduced iron powder filler in the reduced iron powder filler layer 14 is 20 meshes; the particle size of the iron modified rubble filler in the iron modified rubble filler layer 15 is 20 meshes; the particle size of the active alumina filler in the active alumina filler layer 16 is 20 meshes; the particle size of the titanium dioxide filler in the titanium dioxide filler layer 17 is 20 meshes.
The thickness of the quartz sand filler layer 11 is 7cm, the thickness of the coal ash filler layer 12 is 7cm, the thickness of the activated carbon filler layer 13 is 2cm, the thickness of the reduced iron powder filler layer 14 is 7cm, the thickness of the iron-modified rubberlite filler layer 15 is 2cm, the thickness of the activated alumina filler layer 16 is 2cm, and the thickness of the titanium dioxide filler layer 17 is 2 cm.
The thickness of the quartz sand filler layer 11 refers to the vertical height of the top surface of the quartz sand filler layer 11 from the bottom surface thereof (as shown in fig. 1), and the thickness of the other layers refers to the corresponding vertical height thereof.
The permeable reactive barrier for repairing underground water pollution of landfill sites and polluted sites can be used for repairing underground water polluted by arsenic, cadmium, lead and the like, is directly distributed at the tail end of pollution feather when in use, can efficiently treat pollutants, does not have any secondary pollution, and is low in treatment cost.
Example 2
Referring to fig. 2, the present disclosure provides a permeable reactive barrier for repairing groundwater pollution in a landfill and a polluted site, which includes a first wall 2, a second wall 3, and a third wall 4 connected in sequence, wherein the first wall 2, the second wall 3, and the third wall 4 are formed by sequentially stacking a plurality of reactive barrier modules 1.
The first wall 2, the second wall 3 and the third wall 4 are sequentially connected to form a wall body with an opening at one side, and the wall body of the permeable reactive wall faces the pollution plume and is arranged in a type of' ] type. The included angle between the first wall 2 and the second wall 3 is an obtuse angle, and the included angle between the second wall 3 and the third wall 4 is an obtuse angle.
The reaction wall module 1 includes: the module comprises a hollow module framework 18, wherein two end parts of the module framework 18 are respectively provided with a filter screen 19, and a quartz sand filling material layer 11, a fly ash filling material layer 12, an activated carbon filling material layer 13, a reduced iron powder filling material layer 14, an iron modified red gold stone filling material layer 15, an activated alumina filling material layer 16 and a titanium dioxide filling material layer 17 are sequentially filled between the two filter screens 19.
Wherein, the particle size of the quartz sand filler in the quartz sand filler layer 11 is 20 meshes; the particle size of the fly ash filler in the fly ash filler layer 12 is 20 meshes; the particle size of the active carbon filler in the active carbon filler layer 13 is 40 meshes; the particle size of the reduced iron powder filler in the reduced iron powder filler layer 14 is 40 meshes; the particle size of the iron modified rubble filler in the iron modified rubble filler layer 15 is 40 meshes; the particle size of the active alumina filler in the active alumina filler layer 16 is 40 meshes; the particle size of the titanium dioxide filler in the titanium dioxide filler layer 17 is 40 meshes.
The thickness of the quartz sand filler layer 11 is 10cm, the thickness of the coal ash filler layer 12 is 10cm, the thickness of the activated carbon filler layer 13 is 6cm, the thickness of the reduced iron powder filler layer 14 is 10cm, the thickness of the iron-modified rubberlite filler layer 15 is 6cm, the thickness of the activated alumina filler layer 16 is 6cm, and the thickness of the titanium dioxide filler layer 17 is 6 cm.
The permeable reactive barrier for repairing underground water pollution of landfill sites and polluted sites can be used for repairing underground water polluted by arsenic, cadmium, lead and the like, is directly distributed at the tail end of pollution feather when in use, can efficiently treat pollutants, does not have any secondary pollution, and is low in treatment cost.
Example 3
Referring to fig. 3 and 4, the present disclosure provides a method for repairing groundwater pollution in a landfill and a polluted site, which specifically includes the following steps:
(1) preparing quartz sand filling materials: and (3) crushing and screening the quartz sand, and selecting the quartz sand with the specification of 15 meshes as a quartz sand filling material.
(2) Preparing a fly ash filler: the fly ash is crushed and screened, and the 15-mesh fly ash is selected as an active carbon filling material.
(3) Preparing an active carbon filling material: 30-mesh active carbon is selected as an active carbon filling material.
(4) Preparing a reduced iron powder filling material: and selecting 30-mesh iron powder as a reduced iron powder filling material.
(5) Preparing the iron modified rutile filler: crushing and sieving the red gold stone to 20 meshes, and adding FeCl with the concentration of 1.0mol/L3Mixing the solution with stirring, and mixing the rutile and FeCl3The weight ratio of the mixed addition of the solution is 2:1, the mixing and stirring intensity is 20r/min, the stirring and mixing time is 24h, and the solution is dried to be used as the iron modified rutile filler.
(6) Preparing an active alumina filler: the active alumina is crushed and screened, and the active alumina with the specification of 20-40 meshes is selected as an active alumina filling material.
(7) Preparing a titanium dioxide filling material: titanium dioxide of 20-40 meshes is selected as a titanium dioxide filling material.
(8) Manufacturing a permeable reactive barrier module: the reaction wall module is manufactured by using a stainless steel pipe with the diameter D of 20mm as a module framework and fixing stainless steel nets with the aperture of 60 meshes at two ends of the module framework, and the specification of the reaction wall module is 1.0m multiplied by 0.4 m. The reaction wall module is filled with a surface of 1.0m multiplied by 1.0m as a bottom surface from bottom to top in sequence: the titanium dioxide filling material layer is 4cm, the activated alumina filling material layer is 4cm, the iron modified red gold stone filling material layer is 4cm, the reduced iron powder filling material layer is 8cm, the activated carbon filling material layer is 4cm, the fly ash filling material layer is 8cm, and the quartz sand filling material layer is 8cm, and the materials are filled in layers and compacted uniformly.
(9) Permeable reactive barrier laying: according to the practical application requirements, the permeable reactive barrier is built through the combination of the reactive barrier modules, and the permeable reactive barrier is arranged at the tail end of the pollution plume in the pollution site.
The A surface of the permeable reactive barrier is arranged close to one side of the direction of the pollution plume, the whole permeable reactive barrier is arranged in the type of '<' > towards the pollution plume, the wall body of the permeable reactive barrier needs to cover and exceed the section plane of the pollution plume by 20% or more, and the arrangement depth of the permeable reactive barrier is continuously arranged from the ground to the bedrock.
(10) Underground water pollution monitoring and effect guarantee: a polluted water quality monitoring sampling point is arranged at the water outlet end of the permeable reactive wall, and the density of the monitoring point is more than or equal to 1/m2And monitoring the filtering and removing effect of the pollutants of the permeable reactive wall, wherein the monitoring frequency is 1 time/month, and the content (I-V type) of the pollutants such as arsenic, cadmium, lead and the like in underground water quality standard (GB/T14848-2017) is compared, and the permeable reactive wall needs to be additionally arranged on the original foundation when the standard condition is not met until the monitoring reaches the standard.
According to the preparation process and the groundwater pollution remediation method, the in-situ permeable reactive barrier is used for carrying out in-situ purification treatment on the polluted groundwater such as arsenic, cadmium, lead and the like, the permeable reactive barrier is prepared and orderly combined with the filling process to prepare the reactive barrier module, the reactive barrier module is arranged according to the actual polluted groundwater hydrogeology condition and the pollution abatement requirement, the in-situ permeable reactive barrier is arranged at the tail end of the polluted groundwater pollution plume, and the in-situ and up-to-standard abatement of the polluted groundwater such as arsenic, cadmium, lead and the like is ensured by combining pollution monitoring and an unqualified feedback mechanism.
Specifically, the quartz sand is used as a filling material in the step (1). Quartz sand is a hard, wear-resistant, chemically stable silicate mineral, the main mineral component of which isSiO2The 10-20 mesh quartz sand is mainly used for filtering impurities in underground water, and the water permeability of the whole permeable reactive barrier filling material is improved.
And (3) preparing and using fly ash as a filling material in the step (2). The main composition of the fly ash is SiO2、Al2O3、FeO、Fe2O3 CaO、TiO2The porosity is 50-80%, and the purification effect of the fly ash on polluted underground water containing arsenic, cadmium, lead and the like is mainly reflected in the large specific surface area of the fly ash on As3+And As5+Adsorption of ions and of Fe3+、Ca3+、Al3+The combination of the components and the like forms insoluble combined states of arsenic, cadmium, lead and the like, such as aluminum arsenic, iron arsenic, calcium arsenic, aluminum cadmium, iron cadmium, calcium cadmium, aluminum lead, iron lead, calcium lead and the like, so as to achieve the purposes of removing arsenic, cadmium, lead and the like.
And (3) preparing and using active carbon as a filling material. The specific surface area of the activated carbon can reach 2000m2And/g, the strong adsorption performance has good removal effect on arsenic, cadmium, lead and the like.
And (4) preparing and adopting reduced iron powder as a filling material. The process of removing arsenic, cadmium, lead and the like by the reduced iron powder comprises two key processes of oxidation and adsorption, and the reduced iron powder can convert As into As under the aerobic condition3+By oxidation to As5+Simultaneous formation of FeAsO3The precipitate can remove arsenic, cadmium and lead.
And (5) preparing and adopting iron modified rutile as a filling material. The specific surface area of the iron modified rutile reaches 40-60m2The purification effect of/g on the polluted underground water containing arsenic, cadmium, lead and the like is mainly realized by Fe3+Acting to form FeAsO3The precipitate can remove arsenic, cadmium and lead.
And (6) preparing and adopting activated alumina as a filling material. The activated alumina is a porous solid material with high dispersity, has large specific surface area and adsorption performance, and can effectively realize the adsorption removal of arsenic, cadmium, lead and the like in the absorbed groundwater.
And (7) preparing and adopting titanium dioxide as a filling material. The adsorption of titanium dioxide on arsenic, cadmium, lead and the like is mainly supported by the titanium dioxideHigh specific surface area and affinity of surface hydroxyl groups, As3+And As5+Respectively in TiO2Surface formation (TiO)2AsO2And (TiO)2The AsO achieves the purposes of removing arsenic, cadmium, lead and the like.
In the step (8), a stainless steel pipe with the diameter D of 20mm and a stainless steel net with the aperture of 60 meshes are selected to manufacture a permeable reactive wall module framework, and the specification of the framework is 1.0m multiplied by 0.4 m; the permeable reactive barrier module is filled with 1.0m multiplied by 1.0m surfaces as bottom surfaces from bottom to top in sequence: titanium dioxide filler 4cm, active alumina filler 4cm, iron modified rutile filler 4cm, reduced iron powder filler 8cm, active carbon filler 4cm, fly ash filler 8cm, and quartz sand filler 8cm, and filling in layers and compacting uniformly.
The filling of the filling materials is carried out according to the sequence, so that in the reaction wall module, various filling materials are sequentially filled according to the particle size from large to small, the sewage to be treated can sequentially pass through the filling material blocking and filtering layers from coarse to fine to carry out coarse filtering, fine filtering, percolation and the like, the step-by-step layered purification is realized, and the treatment effect is good.
In the step (9), the side A of the permeable reactive barrier close to the direction of the pollution plume is arranged, so that the quartz sand filler layer is close to a pollution source, the polluted water is firstly preliminarily filtered by the quartz sand filler, then other filler layers gradually adsorb and finely filter the polluted water, and subsequent different filler layers sequentially purify the sewage at different levels, so that the treatment effect on the polluted water is better due to layered purification.
The whole permeable reactive barrier is arranged in a type of'/to the pollution feather, the wall body of the permeable reactive barrier needs to cover and exceed the section of the pollution feather by 20% or more, so that the polluted water flows into the permeable reactive barrier from the left side (as shown in figure 3), and the contact area of the sewage and the reactive barrier can be increased by forming a certain angle among the first wall, the second wall and the third wall, and the purification effect is improved.
The arrangement depth of the permeable reactive barrier is continuously arranged from the ground to the bedrock, the bedrock is a fault in which underground water permeates downwards, and the arrangement depth of the permeable reactive barrier is continuously arranged from the ground to the bedrock, so that sewage can be ensured to comprehensively pass through the permeable reactive barrier, the sewage cannot continuously diffuse towards the lower layer, and the polluted water is comprehensively purified through the reactive barrier.
In the step (10), a polluted water quality monitoring sampling point is arranged at the water outlet end of the permeable reactive wall, the density of the monitoring point is more than or equal to 1/m 2, the filtering and removing effects of pollutants of the permeable reactive wall are monitored, the monitoring frequency is 1 time/month, the content (I-V type) requirements of pollutants such as arsenic, cadmium, lead and the like in underground water quality standard (GB/T14848-2017) are compared, and the permeable reactive wall is required to be additionally arranged on the original foundation when the content does not reach the standard until the monitoring reaches the standard.
The method for repairing groundwater pollution in a landfill and a polluted site in the embodiment 3 is applied to a specific implementation site and is used for continuously monitoring groundwater pollution, and the specific process is as follows:
(1) site selection and survey of hydrological, geological and environmental quality conditions of the polluted site are implemented: selecting a historical legacy arsenic factory site field, and determining the distribution, flow direction and pollution conditions of the polluted site groundwater according to hydrologic engineering environment geological survey reports and polluted site environment quality survey reports, wherein the total content of arsenic, cadmium and lead in the polluted site soil is 1568mg/kg, the total concentration of arsenic, cadmium and lead in the polluted site groundwater is 516mg/L, the groundwater burial depth is 4.4m, the bedrock depth is 6m (the sections are sand soil, silt, fully deteriorated sandstone, medium fully weathered deteriorated sandstone, low-weathered deteriorated sandstone and bedrock in sequence), and the section area of the polluted feather terminal groundwater is 1.5m multiplied by 6 m.
(2) And (3) laying a reaction wall: according to the method for repairing the groundwater pollution of the landfill and the polluted site, which is described in the embodiment 3, the reaction wall is arranged at the tail end of the pollution plume of the implementation site.
(3) Underground water pollution monitoring and effect guarantee: a polluted water quality monitoring sampling point is arranged at the water outlet end of the permeable reactive wall, and the density of the monitoring point is more than or equal to 1/m2And monitoring the filtering and removing effect of the pollutants on the permeable reactive barrier, wherein the monitoring frequency is 1 time/month, and the filtering and removing effect is compared with the requirements on the content (I-V type) of the pollutants such as arsenic, cadmium, lead and the like in underground water quality standard (GB/T14848-2017).
In 1 year after the reaction wall is laid, water quality samples of monitoring points on the B surface of the permeable reaction wall are continuously monitored, the total concentration of arsenic, cadmium and lead in the underground water sample is measured by adopting an atomic fluorescence spectrometry, and the dynamic change of the total concentration of the arsenic, cadmium and lead in the underground water of the monitoring points is shown in the following table 1.
Table 1 table unit of dynamic change of total concentration of arsenic, cadmium and lead in groundwater at each monitoring point in example 3: mg/L
Figure BDA0003194952040000101
Referring to the water quality classification standard of underground water quality standard (GB/T14848-:
class I is less than or equal to 0.001mg/L, II class and less than or equal to 0.001mg/L, III class and less than or equal to 0.01mg/L, IV class and less than or equal to 0.05mg/L, V class and more than 0.05 mg/L.
In this embodiment, 9 representative monitoring points are selected to continuously monitor the total concentration of arsenic, cadmium and lead in the treated water for 12 months, as can be seen from table 1 above, the total concentration of arsenic, cadmium and lead in the water treated by the method is less than or equal to 0.05mg/L, and can reach the standard of class IV, that is: the treated underground water can be used as agricultural or industrial water, and can be used as drinking water after being properly treated.
After the method disclosed by the invention is adopted to treat polluted underground water such as arsenic, cadmium, lead and the like, the total concentration of the arsenic, cadmium and lead in the underground water is reduced to 0.05mg/L from 516mg/L, so that the standard of IV-class water quality in the underground water quality standard (GB/T14848-2017) is met, and the pollution removal effect is good.
Comparative example 1
The comparative example adopts conventional activated carbon as a filling material, the arrangement of other steps and reaction walls is completely the same as that of the embodiment 3, and the dynamic change of the total concentration of arsenic, cadmium and lead in underground water of each monitoring point is shown in the following table 2.
Table 2 table unit of dynamic change of total concentration of arsenic, cadmium and lead in groundwater at each monitoring point in comparative example 1: mg/L
Figure BDA0003194952040000111
As can be seen from the above table, the total concentration of arsenic, cadmium and lead in the water treated by the method of comparative example 1 is far greater than that of arsenic, cadmium and lead in example 3, and the water does not reach the IV standard. The treatment effect of the method is not better than that of the method disclosed by the disclosure.
Comparative example 2
The project adopts conventional fly ash as a filling material, the arrangement of other steps and reaction walls is completely the same as that of the implementation 3, and the dynamic change of the total concentration of arsenic, cadmium and lead in underground water of each monitoring point is shown in the following table 3.
Table 3 table unit of dynamic change of total concentration of arsenic, cadmium and lead in groundwater at each monitoring point in comparative example 2: mg/L
Figure BDA0003194952040000112
As can be seen from the above table, the total concentration of arsenic, cadmium and lead in the water treated by the method of comparative example 2 is far greater than that of example 3, and the water does not reach the IV standard. The treatment effect of the method is not better than that of the method disclosed by the disclosure.
As can be seen from the example 1, the comparative example 1 and the comparative example 2, compared with the conventional methods of fly ash and activated carbon and the like, the method disclosed by the disclosure has higher removal efficiency and better treatment effect on heavy metal pollutants such as arsenic, cadmium, lead and the like in water.
The permeable reactive barrier and the method for repairing the pollution of underground water in the landfill and the polluted site have the advantages that the permeable reactive barrier is laid, materials such as titanium dioxide, activated alumina, iron modified rutile, reduced iron powder, activated carbon, fly ash and quartz sand are used as filling materials of the permeable reactive barrier of the underground water through processing and modification, and the polluted underground water such as arsenic, cadmium, lead and the like is repaired through combined actions such as layered filtration, exchange adsorption, chemical precipitation and the like of the filling materials, so that the pollutant treatment efficiency can be improved, the treatment cost can be reduced, the secondary pollution is effectively avoided, the treatment process is clean and efficient, and the permeable reactive barrier and the method are suitable for treating the complicated environmental pollution problem.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the present disclosure, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present disclosure as described above, which are not provided in detail for the sake of brevity.
The disclosed embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalents, improvements, and the like that may be made within the spirit and principles of the embodiments of the disclosure are intended to be included within the scope of the disclosure.

Claims (10)

1. A permeable reactive barrier for groundwater pollution remediation in landfills and contaminated sites, comprising: at least one reaction wall module, the reaction wall module comprising: the module skeleton, two tip of module skeleton all are equipped with the filter screen, two it has quartz sand filler layer, fly ash filler layer, active carbon filler layer, reduced iron powder filler layer, iron modified red gold stone filler layer, active alumina filler layer, titanium white powder filler layer to fill in proper order between the filter screen.
2. The permeable reactive barrier of claim 1, wherein the particle size of the quartz sand filler in the quartz sand filler layer is 10-20 mesh; the particle size of the coal ash filler in the coal ash filler layer is 10-20 meshes; the particle size of the active carbon filler in the active carbon filler layer is 20-40 meshes; the particle size of the reduced iron powder filler in the reduced iron powder filler layer is 20-40 meshes; the particle size of the iron modified rubble filler in the iron modified rubble filler layer is 20-40 meshes; the particle size of the active alumina filler in the active alumina filler layer is 20-40 meshes; the particle size of the titanium dioxide filler in the titanium dioxide filler layer is 20-40 meshes.
3. The permeable reactive barrier of claim 1, wherein the thickness of the quartz sand filler layer is 7-10cm, the thickness of the coal ash filler layer is 7-10cm, the thickness of the activated carbon filler layer is 2-6cm, the thickness of the reduced iron powder filler layer is 7-10cm, the thickness of the iron-modified red gold stone filler layer is 2-6cm, the thickness of the activated alumina filler layer is 2-6cm, and the thickness of the titanium dioxide filler layer is 2-6 cm.
4. The permeable reactive barrier of claim 1, wherein the thickness of the quartz sand filler layer is 8cm, the thickness of the coal ash filler layer is 8cm, the thickness of the activated carbon filler layer is 4cm, the thickness of the reduced iron powder filler layer is 8cm, the thickness of the iron-modified rubble filler layer is 4cm, the thickness of the activated alumina filler layer is 4cm, and the thickness of the titanium dioxide filler layer is 4 cm.
5. The permeable reactive wall of claim 1, further comprising a first wall, a second wall, and a third wall connected in series, wherein the first wall, the second wall, and the third wall are formed by stacking a plurality of the reactive wall modules in series.
6. The permeable reactive wall of claim 1, wherein the first wall, the second wall and the third wall are connected in sequence to form a wall body with one side open.
7. The permeable reactive wall of claim 1, wherein the included angle between the first wall and the second wall is an obtuse angle, and the included angle between the second wall and the third wall is an obtuse angle.
8. A method for remediation of groundwater pollution in landfills and contaminated sites comprising: the permeable reactive wall of any one of claims 1 to 7 is arranged at the tail end of the pollution plume.
9. The method of claim 8, wherein the layer of quartz sand filler is disposed proximate to the contamination plume end;
and/or
The wall body of the permeable reactive barrier covers and exceeds the section of the pollution plume by 20 percent or more.
10. The method of claim 8, further comprising: preparing the quartz sand filler, preparing the fly ash filler, preparing the activated carbon filler, preparing the reduced iron powder filler, preparing the iron-modified rutile filler, preparing the activated alumina filler and preparing the titanium dioxide filler.
CN202110889448.3A 2021-08-03 2021-08-03 Permeable reactive barrier and method for repairing underground water pollution of landfill and polluted site Pending CN113582392A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040134857A1 (en) * 1998-05-14 2004-07-15 The Arizona Board Of Regents Contaminant adsorption and oxidation via the fenton reaction
CN201212019Y (en) * 2008-04-15 2009-03-25 崔维 Cage type pollutant treatment device
JP2009226348A (en) * 2008-03-25 2009-10-08 Kurita Water Ind Ltd Permeable reaction wall and underground water purifying method
CN103723787A (en) * 2013-12-26 2014-04-16 江苏盖亚环境工程有限公司 Method for treating arsenic pollution in underground water
CN107746101A (en) * 2017-11-27 2018-03-02 天津工业大学 A kind of construction method that the PRB in-situ remediation systems for selecting factory are discarded for lead zinc

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040134857A1 (en) * 1998-05-14 2004-07-15 The Arizona Board Of Regents Contaminant adsorption and oxidation via the fenton reaction
JP2009226348A (en) * 2008-03-25 2009-10-08 Kurita Water Ind Ltd Permeable reaction wall and underground water purifying method
CN201212019Y (en) * 2008-04-15 2009-03-25 崔维 Cage type pollutant treatment device
CN103723787A (en) * 2013-12-26 2014-04-16 江苏盖亚环境工程有限公司 Method for treating arsenic pollution in underground water
CN107746101A (en) * 2017-11-27 2018-03-02 天津工业大学 A kind of construction method that the PRB in-situ remediation systems for selecting factory are discarded for lead zinc

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
罗永明等: "《铝系无机材料在含砷废水净化中的关键技术》", 28 February 2019, 冶金工业出版社 *
马琳: "砷污染地下水修复的渗透反应墙材料筛选及除砷机理研究", 《中国优秀博硕士学位论文全文数据库(硕士) 工程科技Ⅰ辑》 *

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Application publication date: 20211102