CN114226449A - Soil gas phase diffusion remediation and treatment method for volatile organic contaminated soil - Google Patents
Soil gas phase diffusion remediation and treatment method for volatile organic contaminated soil Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
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Abstract
The invention belongs to the field of research, development and application of an in-situ remediation technology for organic contaminated soil, and further discloses a soil gas-phase diffusion remediation method for volatile organic contaminated soil, which is applied to the in-situ remediation of volatile organic contaminated soil. And arranging a diversion diffusion pipeline in the aeration zone of the soil to be treated, so that pollutants in the soil gas are transferred to the biological reduction layer and the blocking layer covered above the aeration zone through directional diversion diffusion, and are subjected to degradation treatment, thereby realizing the in-situ treatment of the volatile organic polluted soil. The soil gas phase diffusion repair technology provided by the invention provides safe, reliable, parallel and effective innovative technology selection and guarantee for in-situ treatment of volatile organic contaminated soil.
Description
Technical Field
The invention belongs to the field of research, development and application of an in-situ Remediation technology for organic contaminated soil, and further discloses a soil gas phase Diffusion-Remediation (SVDR) method for volatile organic contaminated soil, which is applied to the in-situ Remediation of volatile organic contaminated soil.
Background
The continuous progress of the petrochemical industry powerfully promotes the development process of industrialization and the progress of social economy in China, relates to a plurality of fields of oil refining, metallurgy, energy, light industry, petrifaction, environment, medicine and the like, and greatly improves the life quality of people. With the continuous improvement of living standard, the high quality demand of ecological civilization is more urgent. However, in the production and operation process of the petrochemical industry, pollution problems of various site soil environments are generated additionally, although environmental protection supervision and process environmental protection measure standards of production enterprises are more strict, some pollution sources are inevitably omitted, and pollution sites are caused, and meanwhile, site pollution problems left in early industrial development are also key points and difficulties of pollution control at the present stage. In the present day that urbanization is continuously expanded, resident living land demand is continuously expanded, early factory relocation in many urban areas, the place that leaves over needs to be developed and utilized urgently, however often the place will have the pollution problem, need repair in order to accomplish follow-up construction. In many site pollution cases, the proportion of volatile organic pollution sites is visible, especially some pollution sites distributed in urban areas, as the periphery is mostly residential areas or densely populated areas, once volatile organic pollutants in the sites are diffused into the air, great health risks and hazards are generated to peripheral residents, and urban construction is also hindered.
Aiming at the treatment of the volatile organic pollution site, the existing pollution site repair technologies are various, including incineration, solvent extraction, multiphase extraction, bioremediation, phytoremediation, electric remediation, photochemical remediation, soil vapor extraction, heat treatment, soil cleaning and the like, and relate to various methods from an in-situ method to an ex-situ method. However, various disadvantages and inconveniences of the application still exist in the existing technologies. Mainly reflect and cause volatile pollutant's exposure and secondary pollution easily in the normal position restoration process, and the ectopic restoration process has avoided digging and clearing and transporting to place soil again, can produce secondary pollution's risk equally, and the restoration cost is higher.
In order to better repair volatile organic contaminated soil, and particularly to be more suitable for in-situ repair in densely populated areas, the patent aims to start with biodegradation and effective separation, and provides a novel in-situ repair technology which is economical, reliable and convenient for construction management so as to meet the requirements of eliminating secondary pollution risks and safely utilizing an original contaminated site, thereby enriching the treatment means of volatile organic contaminated soil and providing a solid technical foundation for further realizing diversified effective repair of organic contaminated soil.
Disclosure of Invention
The invention aims to provide a soil gas phase diffusion repairing and treating method for volatile organic contaminated soil, which is applied to the in-situ treatment of the volatile organic contaminated soil.
In order to achieve the purpose, the invention adopts the technical scheme that:
a diversion diffusion pipeline is arranged on an aeration zone of soil to be treated, so that pollutants in the soil gas are migrated to a biological reduction layer and a blocking layer covered above the aeration zone through directional diversion diffusion, degradation treatment is carried out, and in-situ treatment of the volatile organic polluted soil is further realized.
Digging 80-130 cm below the surface layer of the aeration zone of the soil of the polluted site to be treated, laying a diversion diffusion pipeline in the soil layer of the aeration zone after digging, wherein the diversion diffusion pipeline is 15-30 cm higher than the upper part of the surface layer of the aeration zone, then covering a biological cutting layer and a blocking layer which contain a microbial degradation layer and a crushed stone layer on the aeration zone, so that the diversion diffusion pipeline is arranged in the aeration zone and the microbial degradation layer of the polluted site, and the TVOCs in the gas-enclosed zone polluted soil are led into the biological reduction layer by means of concentration gradient diffusion (the TVOCs are gradually diffused into the biological reduction layer with low concentration from the gas-enclosed zone with high concentration, namely the TVOCs are diffused by means of concentration difference diffusion), and are degraded by microorganisms in the biological reduction layer, meanwhile, TVOCs are blocked and sealed by the blocking layer to form diffused gas circulation in the biological reduction layer, so that pollutants are fully degraded, and in-situ treatment of volatile organic polluted soil is realized.
The biological cutting layer consists of a microbial degradation layer and a crushed stone layer, and the crushed stone layer is positioned between the microbial degradation layer and the blocking layer;
the thickness of the microbial degradation layer is 20-40 cm, and the microbial degradation layer is prepared by mixing a turfy soil matrix, a facultative anaerobic microbial agent and a functional conditioner;
the turfy soil matrix has the turfy soil specific surface area of 1300-1500 m2The grain size is less than or equal to 6mm, the organic matter content is more than or equal to 50 percent, and the organic carbon fertilizer has the functions of providing a fixed carrier for functional microorganisms, adsorbing volatile organic pollutants and providing bioavailable organic carbon for the functional microorganisms;
the gravel layer is formed by filling gravel, the diameter range of the gravel is 0.5-2 cm, and the thickness of the gravel layer is 10-15 cm;
the thickness of the barrier layer is 30-50 cm, the barrier layer is composed of a yellow clay layer and two cloth films, and the yellow clay layer is in direct contact with the crushed stone layer; wherein, the two cloth membranes are sequentially non-woven geotextile, impermeable membrane and non-woven geotextile from bottom to top.
The permeability coefficient of the yellow clay is less than or equal to 8 multiplied by 10-6cm/s, and a cosmid component (a)<0.002mm,%) content is more than or equal to 65%, the thickness of the yellow clay substrate layer is 30-50 cm, and the yellow clay layer is directly contacted with the gravel air guide layer; the two cloth films are sequentially non-woven geotextile, impermeable film and non-woven geotextile from bottom to top, wherein the specification of the non-woven geotextile is 1000-1500 g/m3The thickness of the anti-seepage film is 1.5-2.5 mm, and the upper end of the barrier layer is in contact with clean soil and is used for vegetation planting and other designs;
the upper end of the barrier layer is in contact with clean soil and is used for planting vegetation.
The microbial agent is a microbial agent with a facultative anaerobic function (the microbial agent with the facultative anaerobic function and the TVOCs degradation function can be any microbial agent with the facultative anaerobic function and the microbial agent is a single or mixed microbial agent with the function of degrading volatile organic pollutants, and the microbial agent has the degradation capability of one or more of halogenated alkane, halogenated aromatic hydrocarbon and halogenated olefin), wherein the addition amount of the microbial agent is more than or equal to 5 multiplied by 108CFU/g turfy soil;
the functional conditioner is a mineral conditioner and/or a metabolic conditioner;
wherein the mineral conditioner comprises oxides of iron and manganese, and the main component is Fe3O4And MnO2The particle size ranges from 0.045 mm to 0.075mm, and the applied dose is respectively 200-500 g/m3And 10～20g/m3(ii) a The method is used for optimizing the content of inorganic minerals in the turfy soil and promoting the volatile organic pollutants in the turfy soil matrix to generate chemical oxidation-reduction reaction;
the metabolic conditioner is made of soluble Fe3+、NO3 -、NH4 +、CH3COO+Ions and MnO2And H2Can be used as electron acceptor auxiliary microbial agent under anaerobic condition to carry out anaerobic oxidative degradation on halogenated hydrocarbon, wherein Fe3+The application amount of (A) is 50-300 mmol/g TVOCs, NO3 -The application amount of (a) is 20-120 mmol/g TVOCs; NH (NH)4 +The application amount of (A) is 5-20 mmol/g TVOCs, H2The injection dosage of the injection is 100-300 ppmv; CH (CH)3COO+The application amount is 50-150 mmol/g TVOCs.
The mineral conditioner and the metabolism conditioner have different functions, the mineral conditioner is oxides of iron and manganese, is solid matter and plays a role in chemical oxidation, and the metabolism conditioner is water-soluble and plays a role in promoting microbial metabolism.
The diversion diffusion pipeline is a cylindrical air guide pipe vertically arranged between the aeration zone and the biological reduction layer, the distance from the bottom end of the pipeline to the bottom boundary of the aeration zone is not more than 1/10 of the pollution height range of the aeration zone, the distance from the top end of the pipeline to the top boundary of the microbial degradation layer is 5-10 cm, the distance between every two adjacent pipelines is 5-20 m, and the pipe diameter is 5-15 cm; the two ends of the air duct are sealed, and the side wall and the two ends are respectively provided with holes.
The material of the pipeline is PE steel wire mesh framework plastic composite pipe.
Holes are formed in the side wall of the pipeline along the 12-direction outer perimeter of the cross section of the cylindrical gas guide tube, the included angle between the connecting line of the two adjacent holes and the circle center of the cross section is 30 degrees, the hole diameter is 1-2 cm, and the distance between the two adjacent hole sections along the vertical direction of the pipeline is 5-30 cm; at the top and the bottom of the cylindrical pipeline, holes are distributed in a circumferential mode outwards at the diameter interval of 3-5 cm by taking the circle centers of the upper circle and the lower circle as the reference respectively, each circumference is 12-direction holes, the included angle between the connecting line of the adjacent two holes and the circle centers of the upper circle and the lower circle is 30 degrees, the aperture is 1-2 cm, and the outer surface of the cylindrical pipeline is wrapped by breathable cloth.
The method is applied to the engineering of volatile organic contaminated soil.
In the engineering application of volatile organic contaminated soil, the site soil can be dug downwards to a thickness larger than or equal to the total thickness of the superposition of the biological reduction layer and the barrier layer, then the diversion pipeline layout and the related technical construction are carried out, and the technical construction can also be directly carried out after the surface layer of the site soil is cleaned and leveled.
The invention has the advantages that:
1) the soil gas phase diffusion repair technology can effectively realize tight in-situ volatile organic pollutant sealing and biodegradation through constructing a blocking layer, a biological reduction layer and a soil gas diversion diffusion design, isolate soil gas from outside air through the blocking layer, avoid the risk of secondary pollution, realize pollutant metabolism removal through the degradation of volatile organic pollutant metabolism functional microorganisms of the biological reduction layer and the auxiliary allocation of nutrient auxiliary agents, provide diffusion channels and spaces for volatile organic pollutants adsorbed in a soil matrix through the arrangement of an air guide pipeline, so that the volatile organic pollutants are effectively contacted with the functional microorganisms in the microbial degradation layer to promote the biological metabolism degradation, and the construction mode of auxiliary diversion, biological degradation and tight sealing effectively optimizes the complicated operation of the traditional extraction treatment mode and avoids the risk of leakage of the volatile organic pollutants, the normal re-development and utilization of the polluted site are not interfered, and a repairing technical mode combining biodegradation and strict obstruction which can be applied in situ is formed;
2) the volatile organic pollutant degradation functional microorganisms added in the microbial degradation layer are facultative anaerobic functional microbial inoculum, and because the oxygen partial pressure in soil is very low under the depth of 40-100 cm underground and is approximate to an anaerobic state, the facultative anaerobic functional microorganisms are more suitable for the biological metabolism process under the soil environment condition;
3) the functional conditioner applied in the invention provides an organic carbon source, an electron donor, an electron acceptor and a co-metabolism substrate for microorganisms, and mineral components are supplied in a turfy soil system, so that a substrate nutrient environment required by microbial degradation and a reaction mineral system required in a chemical reaction process are reasonably constructed, and the continuous microbial degradation of volatile organic pollutants is ensured;
4) the designed macadam air conduction layer has the advantages that sufficient space is provided for volatile organic pollutants in a pollution bag air belt to be in mixed contact with the matrix in the microbial degradation layer, and the reasonable macadam air conduction layer space not only ensures that the volatile pollutants are in complete contact with the microbial degradation layer through free diffusion, but also does not cause the accumulation of volatile organic matters due to overlarge space;
5) the soil gas phase diffusion remediation technology constructed in the invention provides a reliable in-situ biodegradation and blocking technology for remediation of volatile organic contaminated soil, avoids the exposure risk of volatile pollutants caused by the traditional cleaning and excavation ex-situ treatment, simultaneously avoids the soil mixing disturbance required by directly mixing a biological agent and an auxiliary agent into the contaminated soil for in-situ remediation, furthest satisfies the blocking and degradation of the volatile pollutants, and ensures the smooth implementation of the lasting and safe treatment.
Drawings
FIG. 1 is a functional schematic diagram of a soil vapor diffusion remediation technique provided by an embodiment of the invention
FIG. 2 is a schematic view of the soil vapor diffusion remediation technique according to an embodiment of the present invention
FIG. 3 is a schematic perspective view of a soil vapor diffusion technique applied to site remediation layout according to an embodiment of the present invention
FIG. 4 is a sectional view of the gas-guiding tube layout in the application of the soil vapor diffusion technology according to the embodiment of the present invention
FIG. 5 is a schematic view of a way of opening holes on the airway passage along the length direction and the outer side
FIG. 6 is a schematic view of the way of opening holes on the lower surface of the airway tube according to the embodiment of the present invention
FIG. 7 is a distribution diagram of microbial abundance in contaminated site remediation by soil vapor diffusion technology according to an embodiment of the present invention
FIG. 8 is a graph showing the change of TVOCs content in aerated soil gas applied to contaminated site remediation by the soil vapor diffusion technique provided in the embodiment of the present invention
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The TVOCs in the polluted aeration zone are guided into the biological reduction layer by a diversion diffusion pipeline in a concentration gradient diffusion mode, the volatile organic pollutants are degraded by the reduction dehalogenation, anaerobic oxidation and co-metabolism degradation of facultative anaerobic microorganisms in the biological reduction layer, the crushed stone gas guide layer is arranged at the upper part of the microbial degradation layer to provide a larger diffusion space for the TVOCs diffused into the microbial degradation layer, so that diffused gas circulation is formed, the isolation of the TVOCs is effectively realized by the barrier layer arranged at the upper layer of the crushed stone gas guide layer, and the TVOCs are prevented from diffusing to the outside while the TVOCs are fully contacted with the biological reduction layer;
furthermore, a biological reduction layer, a barrier layer and a free diffusion air guide pipeline connecting the aeration zone and the biological reduction layer are constructed above the aeration zone of the polluted soil, so that the barrier sealing and biodegradation of volatile organic pollutants are realized; the design of the air guide pipeline effectively promotes the diffusion and the migration of volatile pollutants in the aeration zone to the biological reduction layer, and the contact and biological metabolism probability of volatile organic compounds and functional microorganisms is improved; facultative anaerobic microorganisms and functional conditioners are applied to the biological reduction layer, effective bioavailable carbon sources, electron acceptors, electron donors, co-metabolic substrates and chemical oxidation carriers are provided for the facultative anaerobic microorganisms, and the microorganisms are strengthened to continuously degrade volatile organic pollutants in various modes such as anaerobic reduction dehalogenation and anaerobic oxidation; the blocking layer effectively isolates volatile organic pollutants and strengthens the capture and metabolic degradation of microorganisms through the sealing action of the yellow clay and the two films.
The soil vapor diffusion remediation technology (SVDR) is demonstrated and applied to a polluted site left after a certain chemical plant is moved, the following real-time example takes the site demonstration application as an example for explanation, and the system explains the construction of related structures, parameter setting, treatment effect aiming at volatile organic pollutants in soil and planning application of the polluted site ground surface in the application of the soil vapor diffusion technology.
Embodiment adopts SVDR technology to carry out historical legacy chemical industry pollution site treatment and application
The exemplary area for treating the chemical pollution site is 3600m2The field surface has weeds, broken bricks and tiles and other building garbage, the field soil pollution survey result in the early stage shows that the vertical range from the field surface to the underground 10m aeration zone has serious pollution of volatile organic pollutants (TVOCs), a PID detector is adopted to carry out multiple times of determination of the TVOCs of each sampling depth of the soil sample, and the average pollution concentration of the TVOCs in the soil gas reaches 23500 +/-1150 mu g/m3The on-site sensory embodiment shows that the tea has stronger pungent peculiar smell, and can bring greater threat to human health after being placed in the tea for a long time. Planning to be public greening park land according to the land of the land parcel. Aiming at 3600m by adopting SVDR technology2The polluted area is treated and demonstrated, and the function of the treated planning land is simulated to evaluate the treatment effect of the remediation technology.
Referring to fig. 1-3, according to the current situation characteristics of the polluted site, after the soil surface layer is cleaned, the barrier layer and the biological reduction layer related to the SVDR technology are embedded into the polluted air-covering belt layer, so that the upper surface of the barrier layer is level with the surface elevation of the original polluted site, and the clean soil layer covers the upper surface of the barrier layer to perform herbaceous plant preparation and planting for landscape greening. According to the design of a demonstration period, the SVDR technology structure of the demonstration project is planned to be laid in 4-5 months of the year, sampling is carried out from 6 months to 3 months of the next year, and the abundance of microorganisms and the content of TVOCs in soil gas are monitored. In the construction process of the SVDR technical structure, firstly, building garbage such as broken stones on the surface layer of the site is cleaned, then, the area 120cm away from the surface layer is dug vertically, and odor inhibitor is sprayed during digging to eliminate peculiar smell, so that secondary pollution of volatile pollutants to the air around the site is avoided.
After grooving and dredging, conducting SVDR technology structure construction, firstly conducting air guide pipeline layout (see figures 4-6), and conducting pipeline layout pore punching on a soil aeration zone layer by adopting a pile driver, wherein the punching depth of the pile driver is designed to be 7.8m, the punching aperture is 10cm, and the distance between two adjacent holes is 10m in view of the fact that the depth of the remaining polluted aeration zone soil layer is 8.8 m; sealing two ends of the gas guide pipe, performing hole opening treatment on the gas guide pipe, and performing hole opening treatment on the side wall and two ends of the gas guide pipe respectively, wherein holes are formed in the side wall of the gas guide pipe along the outer perimeter of the cross section of the cylindrical gas guide pipe in the 12-direction, the included angle between the adjacent two holes and the connecting line of the circle centers of the cross sections is 30 degrees, the hole diameter is 1.5cm, and the section interval between the adjacent two holes along the length direction of the gas guide pipe is 10 cm; on the top and the bottom of the cylindrical pipeline, circular distributed holes are respectively formed outwards by taking the circle centers of the upper and the lower circular surfaces as the reference and taking 3cm as the diameter interval, each circle is a hole in 12 directions, the included angle between the adjacent two holes and the connecting line of the circle centers of the upper and the lower circular surfaces is 30 degrees, the aperture is 1.5cm, the outer surface of the cylindrical pipeline is wrapped by breathable cloth to prevent the air holes from being blocked, and the total length of the air guide pipeline is designed to be 8.15 m; the air guide pipes after the hole opening treatment are vertically inserted into the holes of the soil layer of the aeration zone which is opened in advance, the depth of the air guide pipes inserted into the aeration zone is 7.8m, 36 air guide pipes are inserted into the air guide pipes according to the hole opening design of a demonstration site, and then a biological reduction layer is laid on the surface layer of the aeration zone.
The biological cutting layer is prepared by mixing a turfy soil matrix, a facultative anaerobic functional microbial agent and a functional conditioner, and is prepared by taking the turfy soil matrix as a main body, simultaneously mixing the functional microbial agent and the functional conditioner, and homogenizing. The specific process parameters include: the specific surface area is 1300m2The overall grain diameter range of the turfy soil is less than 5.6mm, and the organic matter content of the turfy soil reaches 56.8 percent; mixing 9.1 × 10 with turfy soil8CFU/g peat soil facultative anaerobic function microbial inoculum, and then mixed with function conditioner;
the facultative anaerobic functional microbial agent is Pseudomonas aeruginosa (Pseudomonas aeruginosa), and the microbial agent can be obtained commercially;
the functional conditioner is a mineral conditioner and a metabolic conditioner, wherein the mineral conditioner is 350g/m3Fe (b) of3O4And 20g/m3MnO of2Fe used3O4And MnO2The particle size of the active carbon is 0.05mm, and then a metabolism conditioner is mixed into the turfy soil matrix, wherein the metabolism conditioner is soluble Fe3+、NO3 -、NH4 +、CH3COO+Ions and MnO2Wherein, Fe3+Is applied at a concentration of 150mmol/g TVOCs, NO3 -Is administered at a concentration of 70mmol/g TVOCs; NH (NH)4 +Is administered at a concentration of 15mmol/g TVOCs; CH (CH)3COO+Is applied at a dose of 120mmol/g TVOCs and a batch wise 150ppmv H feed into the biodegradable layer2。
Filling the prepared turfy soil matrix to the upper layer of the surface of the aeration zone pollution layer, so that the total thickness of the microbial degradation layer reaches 40cm, namely exceeds 5cm of the tail end of the vertically arranged gas guide pipeline;
and then paving a gravel layer of 15cm on the upper layer of the biological cutting layer, wherein the gravel layer is composed of gravels, and the diameter of each gravel is 1.5-2 cm.
Constructing a barrier layer on the upper end of the crushed stone layer, wherein the barrier layer is composed of a yellow clay layer and two cloth-one membranes, and the permeability coefficient of the yellow clay is 5 multiplied by 10-6cm/s, cosmid fraction: (<0.002mm,%) content of 71%, the thickness of the laid yellow clay matrix layer is 40cm, and the yellow clay layer is directly contacted with the gravel air guide layer; two cloth-one films are laid on the upper surface of the yellow clay layer, the two cloth-one films are sequentially non-woven geotextile, impermeable film and non-woven geotextile from bottom to top, wherein the specification of the non-woven geotextile is 1200g/m3The thickness of the anti-seepage film is 1.5 mm; the upper end of the barrier layer is in contact with clean soil, the thickness of the clean soil layer is designed to be 25cm, and herbaceous plants such as ryegrass and asterias are planted in the clean soil layer; further leading volatile pollutants (TVOCs) in the soil into the biological reduction layer in a concentration gradient diffusion mode by utilizing a diversion diffusion pipeline, degrading the volatile organic pollutants by utilizing the reduction dehalogenation, anaerobic oxidation and co-metabolism degradation of facultative anaerobic microorganisms in the biological reduction layer, arranging a broken stone gas guide layer on the upper part of the microbial degradation layer, and providing a larger diffusion space for the TVOCs diffused into the microbial degradation layerThe blocking layer arranged on the upper layer of the gravel air conduction layer effectively realizes the isolation of the TVOCs, and prevents the TVOCs from diffusing to the outside while ensuring the full contact between the TVOCs and the biological reduction layer; meanwhile, in order to perform sampling monitoring, 10 sampling points are arranged in the middle area of a demonstration field, sampling monitoring is performed on the field every month, and after sampling, sampling holes are completely closed to prevent pollutants from diffusing.
After sampling is carried out at a sampling time node according to the design, PID is used for respectively measuring samples with the depths of 3m, 6m and 9m in the aeration zone layer, the result is shown in figure 8, after 12 months of SVDR technical treatment, the average concentration of TVOCs in soil gas is reduced by 65.1%, and meanwhile, the abundance of facultative anaerobic microorganisms in the microbial degradation layer of the demonstration site is still maintained at 3 multiplied by 107CFU/g peatmoss (FIG. 7), indicating that it still has the potential to continuously degrade TVOCs; in addition, the green space greening function is realized on the ground surface of the field, so that the aims of underground organism reduction, pollutant isolation and sealing and ground soil development and reutilization of TVOCs in the volatile organic pollution field by adopting a soil vapor diffusion remediation technology (SVDR) are fulfilled. Therefore, the SDVR technology has a good application effect in the in-situ treatment and restoration of volatile organic polluted soil, and particularly has a huge future application and popularization prospect in the polluted site soil which is short in land resources and needs to be planned and utilized urgently.
TABLE 1
Claims (9)
1. A soil gas phase diffusion restoration treatment method for volatile organic contaminated soil is characterized in that: and arranging a diversion diffusion pipeline in the aeration zone of the soil to be treated, so that pollutants in the soil gas are transferred to the biological reduction layer and the blocking layer covered above the aeration zone through directional diversion diffusion, and are subjected to degradation treatment, thereby realizing the in-situ treatment of the volatile organic polluted soil.
2. The soil vapor diffusion remediation method for volatile organic contaminated soil of claim 1 further comprising: the method comprises the steps of digging 80-130 cm below the surface layer of an aeration zone of the soil of the polluted site to be treated, laying a flow guide diffusion pipeline in the aeration zone soil layer after digging, wherein the flow guide diffusion pipeline is 15-30 cm higher than the upper part of the surface layer of the aeration zone, covering a biological cutting layer and a blocking layer which comprise a microbial degradation layer and a gravel layer on the aeration zone, enabling the flow guide diffusion pipeline to be arranged in the aeration zone and the microbial degradation layer of the polluted site, leading TVOCs in the polluted soil of the aeration zone into the biological cutting layer in a concentration gradient diffusion mode, degrading the TVOCs by using microorganisms in the biological cutting layer, blocking and sealing the TVOCs by the blocking layer to form diffusion gas circulation in the biological cutting layer, fully degrading pollutants, and further realizing in-situ treatment of the volatile organic polluted soil.
3. The soil vapor diffusion remediation method for volatile organic contaminated soil of claim 2 further comprising: the biological cutting layer consists of a microbial degradation layer and a crushed stone layer, and the crushed stone layer is positioned between the microbial degradation layer and the blocking layer; the thickness of the microbial degradation layer is 20-40 cm, and the microbial degradation layer is prepared by mixing a turfy soil matrix, a facultative anaerobic microbial agent and a functional conditioner;
the gravel layer is formed by filling gravel, the diameter range of the gravel is 0.5-2 cm, and the thickness of the gravel layer is 10-15 cm;
the thickness of the barrier layer is 30-50 cm, the barrier layer is composed of a yellow clay layer and two cloth films, and the yellow clay layer is in direct contact with the crushed stone layer; wherein, the two cloth membranes are sequentially non-woven geotextile, impermeable membrane and non-woven geotextile from bottom to top.
4. The soil vapor diffusion remediation method for volatile organic contaminated soil of claim 3 further comprising: the upper end of the barrier layer is in contact with clean soil and is used for planting vegetation.
5. According to claimThe soil gas phase diffusion remediation method for volatile organic contaminated soil, according to claim 3, is characterized in that: the microbial agent is a microbial agent with a facultative anaerobic function, wherein the addition amount of the microbial agent is more than or equal to 5 multiplied by 108CFU/g turfy soil.
6. The soil vapor diffusion remediation method for volatile organic contaminated soil of claim 3 further comprising:
the functional conditioner is a mineral conditioner and/or a metabolic conditioner;
wherein the mineral conditioner consists of oxides of iron and manganese, and the applied dosage is 200-500 g/m3And 10 to 20g/m3，
The metabolic conditioner is made of soluble Fe3+、NO3 -、NH4 +、CH3COO+Ions and MnO2And H2Wherein, Fe3+The application amount of (A) is 50-300 mmol/g TVOCs, NO3 -The application amount of (a) is 20-120 mmol/g TVOCs; NH (NH)4 +The application amount of (A) is 5-20 mmol/g TVOCs, H2The injection dosage of the injection is 100-300 ppmv; CH (CH)3COO+The application amount is 50-150 mmol/g TVOCs.
7. The soil vapor diffusion remediation method for volatile organic contaminated soil of claim 2 further comprising: the diversion diffusion pipeline is a cylindrical air guide pipe vertically arranged between the aeration zone and the biological reduction layer, the distance from the bottom end of the pipeline to the bottom boundary of the aeration zone is not more than 1/10 of the pollution height range of the aeration zone, the distance from the top end of the pipeline to the top boundary of the microbial degradation layer is 5-10 cm, the distance between every two adjacent pipelines is 5-20 m, and the pipe diameter is 5-15 cm; the two ends of the air duct are sealed, and the side wall and the two ends are respectively provided with holes.
8. The soil vapor diffusion remediation method for volatile organic contaminated soil of claim 7 further comprising: holes are formed in the side wall of the pipeline along the 12-direction outer perimeter of the cross section of the cylindrical gas guide tube, the included angle between the connecting line of the two adjacent holes and the circle center of the cross section is 30 degrees, the hole diameter is 1-2 cm, and the distance between the two adjacent hole sections along the vertical direction of the pipeline is 5-30 cm; at the top and the bottom of the cylindrical pipeline, holes are distributed in a circumferential mode outwards at the diameter interval of 3-5 cm by taking the circle centers of the upper circle and the lower circle as the reference respectively, each circumference is 12-direction holes, the included angle between the connecting line of the adjacent two holes and the circle centers of the upper circle and the lower circle is 30 degrees, the aperture is 1-2 cm, and the outer surface of the cylindrical pipeline is wrapped by breathable cloth.
9. The soil vapor diffusion remediation method for volatile organic contaminated soil of claim 1 further comprising: the method is applied to the engineering of volatile organic contaminated soil.
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