CN111266402A - Biological barrier system and method for blocking path of benzene series in field to move to atmosphere - Google Patents
Biological barrier system and method for blocking path of benzene series in field to move to atmosphere Download PDFInfo
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- CN111266402A CN111266402A CN202010104700.0A CN202010104700A CN111266402A CN 111266402 A CN111266402 A CN 111266402A CN 202010104700 A CN202010104700 A CN 202010104700A CN 111266402 A CN111266402 A CN 111266402A
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- 238000005273 aeration Methods 0.000 claims abstract description 122
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- 229910052760 oxygen Inorganic materials 0.000 claims description 20
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 15
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- 238000006065 biodegradation reaction Methods 0.000 claims description 9
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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
- B09C1/00—Reclamation of contaminated soil
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
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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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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Microbiology (AREA)
- Physics & Mathematics (AREA)
- Biotechnology (AREA)
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Abstract
The invention relates to the technical field of pollution site risk management and control, and discloses a biological barrier system and a biological barrier method for blocking a migration path of benzene series in a site to the atmosphere. The invention covers right above the polluted area, and sequentially comprises an aeration layer and a barrier layer from bottom to top, wherein the barrier layer is clean soil with biological activity; the aeration layer comprises a filter material layer laid above the polluted area and an aeration pipe embedded in the filter material layer; the soil gas monitoring system comprises a layered monitoring gas well and a soil gas collecting device, wherein the soil gas collecting device comprises an air guide device embedded in the layered monitoring gas well, the air guide device is communicated with an air inlet of an air extractor on the ground through a guide pipe, the air guide device is arranged at intervals along the depth direction of the layered monitoring gas well and embedded in an air guide material layer, isolation layers are respectively laid on the upper side and the lower side of the air guide material layer, and a connecting layer is filled between the isolation layers of the air guide devices adjacent to each other from top to bottom. The invention has the advantages of low cost, in-situ blocking, no secondary pollution, economy, environmental protection and good blocking effect.
Description
Technical Field
The invention relates to the technical field of pollution site risk management and control, in particular to a biological barrier system and a biological barrier method for blocking a migration path of benzene series in a site to atmosphere.
Technical Field
Benzene series with high volatility is generally detected at high frequency in soil and underground water of industrial polluted sites, and pollutants of the type can finally enter surface air through a series of migration and transformation and cause harm to human health after being inhaled through breathing.
At present, the risk control of the pollution site in China mainly takes remediation as a main factor. Benzene series are removed from soil and groundwater by taking a series of high-energy-consumption and high-disturbance engineering remediation measures, so that the possible risks to the health of people are eliminated. However, in the implementation process of the engineering repair measures, the benzene series has strong volatility, so that the benzene series is easy to escape into the surrounding atmospheric environment, and secondary pollution is caused. Meanwhile, odor problems in the implementation process are very likely to cause the resistance of surrounding crowds and finally cause crowd events. In addition, due to the adsorption of soil organic matters to pollutants, a tailing phenomenon is easy to occur in the repairing process, so that the period of repairing engineering is prolonged, the repairing effect is uncertain to a certain extent, and the site is finally influenced to be re-developed and utilized.
Disclosure of Invention
The invention discloses a biological barrier system and a biological barrier method for blocking a migration path of a benzene series to the atmosphere in a site, which have the advantages of low cost, in-situ blocking, no secondary pollution, economy, environmental protection and good barrier effect on the benzene series, and can effectively control the respiratory exposure health risk target of the benzene series.
The method solves the problem of secondary pollution easily generated in the traditional soil remediation process, cuts off the way of benzene series migration to the atmosphere, avoids the pollution of waste gas generated in the soil remediation process to the atmosphere, and is economical, environment-friendly and long in remediation period.
The biological blocking system for blocking the way of benzene series in the field to migrate to the atmosphere covers the polluted area, sequentially comprises an aeration layer and a blocking layer from bottom to top, and further comprises a soil gas monitoring system, wherein the blocking layer is clean soil with biological activity;
the aeration layer comprises a filter material layer laid above the polluted area and an aeration pipe embedded in the filter material layer, and the aeration pipe is connected with an aeration fan through a connecting pipe;
the soil gas monitoring system comprises a layered monitoring gas well and a soil gas collecting device, wherein the layered monitoring gas well is distributed at intervals in the plane range of a polluted area; the soil gas collecting device comprises a gas guide device embedded in the layered monitoring gas well, an air pumping device and a collecting device which are positioned on the ground; the air guide devices are communicated with air inlets of the air extraction devices on the ground through guide pipes respectively, the air guide devices are arranged at intervals along the depth direction of the layered monitoring gas well and are embedded in the air guide material layer, isolation layers are laid on the upper side and the lower side of the air guide material layer respectively, and a connecting layer is filled between the isolation layers of the air guide devices adjacent to each other from top to bottom.
The invention relates to a biological barrier system for blocking a way of benzene series migration to the atmosphere in a field, and further, the thickness of a filter material layer is not less than 30cm and is formed by laying quartz sand with the particle size of 2-5mm, and aeration pipes are horizontally arranged and arranged at intervals in parallel.
The invention relates to a biological separation system for blocking the migration path of benzene series in field soil to the atmosphere, which is characterized in that one end of a connecting pipe is communicated with an aeration pipe, the other end of the connecting pipe vertically extends upwards to the ground and then is connected with an aeration fan, and a pressure gauge, a vortex flowmeter and an adjusting valve are sequentially connected in series on the connecting pipe on the ground along the air flowing direction.
The biological blocking system for blocking the migration path of the benzene series in the field to the atmosphere is characterized in that aeration seams are arranged on the aeration pipes at intervals, the aeration seams are arranged along the axial direction of the aeration pipes, the length of each aeration seam is not more than 20mm, the width of each aeration seam is not more than 1mm, the distance between every two adjacent aeration seams on the same aeration pipe is not more than 10mm, and the rate of each aeration seam on each aeration pipe is not more than 8%.
The invention relates to a biological barrier system for blocking a way of transferring benzene series in a field to the atmosphere, and further a geomembrane is arranged between an aeration layer and a barrier layer.
The invention relates to a biological barrier system for blocking a path of benzene series in a field to move to the atmosphere, and further, when the soil in a polluted area has no non-aqueous phase liquid, the thickness of a barrier layer is not less than 1.5m, and when the soil in the polluted area has the non-aqueous phase liquid, the thickness of the barrier layer is not less than 4.5 m.
The invention relates to a biological barrier system for blocking a way of benzene series in a field migrating to the atmosphere, and further, the soil of the clean soil is intrinsic in that the permeability coefficient is not lower than 10-8cm2The water content by weight is 10-15%, the pH of the soil is 6-9, and the ratio of C in the soil is as follows: n: p: the weight ratio of K is 100: 10-15: 1:1, and the number of indigenous microorganisms contained in the clean soil is not less than 105cfu per gram of dry soil.
The invention relates to a biological barrier system for blocking a way of benzene series in a field to migrate to the atmosphere, and further, the distance between the upper air guide device and the lower air guide device is not more than 1.5 m; the gas guide material layer is formed by laying quartz sand with the particle size of 2-4mm, the thickness of the gas guide material layer is not less than 30cm, the isolation layer is a dry bentonite layer with the thickness of not more than 10cm, and the connection layer is a wet bentonite layer.
The invention relates to a biological barrier system for blocking the migration path of benzene series in a field to the atmosphere, which is characterized in that a gas inlet of a guide pipe is communicated with a gas outlet of a gas guide device, one end of the gas outlet vertically penetrates through a layer of filler layer by layer upwards to reach a wellhead, and penetrates through a sealing platform positioned at the wellhead to be connected with a gas extraction device, and a gas tightness valve is arranged at the gas outlet of the guide pipe.
The invention relates to a blocking method of a biological blocking system for blocking a way of benzene series to migrate to the atmosphere in a site, which comprises the following steps:
the method comprises the following steps of firstly, defining the pollution range of benzene series in soil and underground water of a site, and judging the site pollution condition;
step two, according to the pollution situation in the polluted area, cleaning and digging the soil above the polluted area;
leveling the bottom of a foundation pit formed by cleaning and digging the polluted area, constructing an aeration layer, laying a filter material layer, arranging an aeration pipe and a connecting pipe, laying the filter material layer above the aeration pipe, and leveling;
fourthly, paving a geomembrane on the surface of the leveled filter material layer;
backfilling clean soil with bioactivity on the geomembrane, backfilling in layers, compacting each layer properly, wherein the upper surface of the barrier layer is flush with the ground, and the compacted clean soil is required to keep the soil intrinsic permeability coefficient of the barrier layer not less than 10-8cm2；
Step six, after the clean soil is backfilled and stabilized, arranging layered monitoring gas wells in the unfavorable areas of the aeration flow field in the range of the polluted area, and mounting soil gas collecting devices at different depth positions in the layered monitoring gas wells;
step seven, communicating a connecting pipe extending to the upper part of the ground with an aeration fan, and completing the connection of an aeration system and a variable frequency control system;
step eight, opening aeration fan and governing valve, aerating the barrier layer to adjust the intraformational aerobic degradation efficiency of barrier, specific aeration barrier process is as follows:
8.1, supplying air into the aeration pipe through an aeration fan so as to supply oxygen into the separation layer;
8.2, air enters the aeration layer through the aeration pipe and enters the separation layer through gaps of the filter material layer, so that the oxygen content in the living environment of microorganisms in the separation layer is improved, the oxygen content in the clean soil is controlled to be uniformly distributed and not lower than 10%, indigenous microorganisms in the clean soil are subjected to aerobic biodegradation by taking benzene series steam which vertically migrates upwards from a polluted area as a carbon source and a nitrogen source, and the way of vertically migrating the benzene series upwards is separated;
and 8.3, collecting soil gas samples periodically, detecting and analyzing gas components, determining the oxygen content and the benzene series content in the gas samples, and adjusting aeration quantity according to the oxygen content to ensure the aerobic biodegradation.
The biological barrier system and the method for blocking the way of benzene series in the field to migrate to the atmosphere have the following beneficial effects:
for petroleum hydrocarbon polluted sites mainly containing benzene series, benzene series steam in soil vertically migrates upwards in soil gaps of aeration zones, in the invention, the benzene series steam migrates upwards to pass through an aeration layer to enter a barrier layer, and microorganisms in clean soil perform aerobic biodegradation with the benzene series under the condition that the micro-ecological environment such as moisture, oxygen concentration and the like is appropriate in the barrier layer, so that the benzene series is degraded into non-toxic or low-toxic substances; through manual regulation and control, an aerobic microbial degradation zone with a certain thickness is created, the biodegradation of microbes on benzene series is promoted in the process that the benzene series vertically migrates into the earth surface atmosphere, the volatilization and migration of the benzene series into the earth surface atmosphere are blocked, and the aim of controlling the respiratory exposure health risk of the benzene series is finally achieved.
The biological barrier system has good barrier effect on the benzene series, and after the biological barrier system is continuously operated, the barrier rate on the benzene series steam is not lower than 98 percent, thereby basically blocking the migration path of the benzene series and avoiding the pollution of the benzene series to the atmosphere.
Description of the drawings:
FIG. 1 is a front view of a bio-barrier system of the present invention;
FIG. 2 is a schematic view of the configuration of an aeration system;
FIG. 3 is a schematic diagram of a configuration for monitoring gas wells in layers.
Reference numerals: 1-contaminated area; 2-a filter material layer; 21-geomembrane; 3-an aerator pipe; 4-connecting pipe; 41-pressure gauge; 42-vortex shedding flowmeter; 43-a regulating valve; 5-an aeration fan; 6-a barrier layer; 7-layered monitoring of gas wells; 71-an air guide material layer; 72-an isolation layer; 73-a tie layer; 74-a sealing station; 75-a cover; 8-a soil gas collection device; 81-air guide means; 82-a catheter; 83-airtight valves; 9-frequency conversion control system.
Detailed Description
As shown in figures 1-3, the biological barrier system for blocking the benzene series in the field from migrating to the atmosphere covers the polluted area 1, sequentially comprises an aeration layer and a barrier layer 6 from bottom to top, and further comprises a soil gas monitoring system and a variable frequency control system 9.
The aeration layer comprises a filter material layer 2 laid above the polluted area 1 and an aeration pipe 3 buried in the filter material layer 2, and the aeration pipe 3 is connected with an aeration fan 5 through a connecting pipe 4. The thickness of the filter material layer 2 is not less than 30cm, and the filter material layer is formed by laying quartz sand with the particle size of 2-5mm, so that a supporting framework of the aeration pipe 3 can be formed, the damage to the aeration pipe 3 in real time caused by back-filling and pressing of the barrier layer 6 is avoided, meanwhile, appropriate gaps can be formed among granules of the quartz sand, a passage through which aeration can pass is provided, and the aeration can smoothly and effectively enter the barrier layer 6 upwards.
3 horizontal setting of aeration pipe, parallel interval arranges, the distance between the adjacent aeration pipe 3 is not more than 4m, aeration pipe 3 is the rigid polyethylene pipe that the external diameter is not less than 5cm, the wall thickness selects the tubular product that can withstand voltage at least 1.6MPa, the interval is provided with the aeration seam on the aeration pipe 3, the aeration seam sets up along aeration pipe 3's axial, length is not more than 20mm, the aeration seam is formed for laser cutting, the width is not more than 1mm, the distance between the adjacent aeration seam on the same aeration pipe 3 is not more than 10mm, the rate of slotting on every aeration pipe 3 is not more than 8%; the distance between the aeration pipe 3 and the upper surface or the lower surface of the filter material layer 2 is not less than 10cm, so that the aeration effect is ensured, and the aeration pipe 3 is prevented from being crushed.
One end of the aeration pipe 3 is sealed, the other end of the aeration pipe is connected with the aeration fan 5 through a connecting pipe 4, one end of the connecting pipe 4 is communicated with the aeration pipe 3 through a 90-degree elbow, the other end of the connecting pipe vertically extends upwards to the ground and then is connected with the aeration fan 5, the connecting pipe 4 is a hard polyethylene pipe with the outer diameter not less than 5cm, a pressure gauge 41, a vortex shedding flowmeter 42 and an adjusting valve 43 are sequentially connected in series on the connecting pipe 4 on the ground along the air flowing direction, so that the aeration quantity can be monitored and adjusted at any time, and the oxygen content in the blocking layer 6 can; the regulating valve 43 is a ball valve, and the signal input ends of the pressure gauge 41, the vortex flowmeter 42 and the regulating valve 43 are respectively electrically connected with the signal output end of the variable frequency control system 9.
The aeration fan 5 is a turbine air pump, the air pressure at the outlet is 20-40kPa, and the signal input end of the turbine air pump is electrically connected with the signal output end of the variable frequency control system 9.
And a geomembrane 21 is also arranged between the aeration layer and the barrier layer 6.
The barrier layer 6 is clean soil with bioactivity, the thickness is not less than 1.5m, and is distinguished according to the soil condition of the polluted area 1, and when the soil of the polluted area 1 has no non-aqueous phase liquid, the thickness of the barrier layer 6 isNot less than 1.5m, when the soil in the contaminated area 1 has non-aqueous phase liquid, the thickness of the barrier layer 6 is not less than 4.5m, and the soil intrinsic permeability coefficient of clean soil is not less than 10-8cm2The water content by weight is 10-15%, the pH of the soil is 6-9, and the ratio of C in the soil is as follows: n: p: the weight ratio of K is 100: 10-15: 1:1, and the number of indigenous microorganisms contained in the clean soil is not less than 105cfu per gram of dry soil provides a suitable environment for the aerobic degradation of benzene series by microorganisms.
The soil gas monitoring system comprises layered monitoring gas wells 7 and soil gas collecting devices 8 arranged in the layered monitoring gas wells 7, the layered monitoring gas wells 7 are distributed at intervals in the plane range of the pollution area 1, and the distance between every two adjacent layered monitoring gas wells 7 is not less than4m, the layered monitoring gas wells 7 are positioned between the adjacent aeration pipes 3, more preferably, the layered monitoring gas wells 7 are positioned at the central positions with the same distance between the adjacent aeration pipes 3 at two sides, when the layered monitoring gas wells 7 are arranged, the arrangement in the area with unfavorable aeration flow fields is considered preferentially, the aerobic degradation condition in the range of the polluted area 1 can be mastered uniformly and comprehensively in real time, the flexible adjustment can be performed according to different conditions, the higher degradation effect can be kept, and the migration path of benzene series steam can be effectively blocked.
The well head department of layering monitoring gas well 7 is provided with seals platform 74, seals platform 74 and is the concrete structure for seal layering monitoring gas well 7, be convenient for form inclosed sample environment, seal platform 74 top cover and be equipped with housing 75, housing 75 is the UPVC material, when not taking a sample the during operation, plays sealed effect, avoids the rainwater to get into layering monitoring gas well 7, influences inside soil gas collection system 8.
The soil gas collecting device 8 selectively uses the gas collecting system in the invention patent CN102288457B entitled Portable soil volatile gas collecting system and collecting method thereof, and can collect soil volatile gas in the layered monitoring gas well 7 at regular time, the soil gas collecting device 8 comprises a gas guide device 81 embedded in the layered monitoring gas well 7, an air suction device and a collecting device which are positioned on the ground, the gas guide device 81 is respectively communicated with the air inlet of the air suction device on the ground through a conduit 82, and the gas guide device 81 monitors the depth of the gas well 7 along the layersThe directions are arranged at intervals and are embedded in the air guide material layer 71, and the distance between the upper air guide device 81 and the lower air guide device 81 which are adjacent is not more than 1.5 m; the gas guide material layer 71 is formed by laying quartz sand with the particle size of 2-4mm, the thickness of the gas guide material layer is not less than 30cm, the gas guide device 81 is embedded in the middle of the gas guide material layer 71, the upper side and the lower side of the gas guide material layer 71 are respectively provided with an isolation layer 72, the isolation layer 72 is a dry bentonite layer with the thickness of not more than 10cm, and dry bentonite with the particle size of not more than 4mm is selected as the dry bentonite; the connecting layers 73 are filled between the isolating layers 72 of the air guide devices 81 adjacent up and down, the connecting layers 73 are wet bentonite layers, the grain diameter is not more than 4mm, and the water content is 25% ~40%The air inlet of the conduit 82 is communicated with the air outlet of the air guide device 81, one end of the air outlet vertically penetrates through the layer of filler to the well mouth upwards, the filler penetrates through the sealing platform 74 and then is connected with an air extraction device, an air tightness valve 83 is arranged at the air outlet of the conduit 82, the opening and closing of sampling are convenient to control, the conduit 82 is a nylon pipe with the diameter not smaller than 4mm, the air outlet of the air extraction device is communicated with the air inlet of a collection device, and the air extraction device and the collection device are the air extraction device and the collection device in the invention patent CN 102288457B.
When the sampling operation is not carried out, the conduit 82 is not connected with the air extractor, the cover 75 covers the sealing platform 74, and the air outlet of the conduit 82 and the regulating valve 43 which are exposed outside are covered, so that the pollution of rainwater and atmosphere is avoided; when sampling operation is performed, the air outlet of the conduit 82 is connected with an air extraction device, and the sampling operation is started.
Taking a benzene series pollution area 1 of a certain coke-oven plant as an example, the area of the implementation area is about 400m2(20 m multiplied by 20m), the benzene series polluted soil is buried under 5m deep below the ground, and residual phase light non-aqueous phase liquid (LNAPL) exists in the polluted area 1.
The invention relates to a method for blocking a biological barrier system of a way of benzene series to migrate to the atmosphere in a site, which specifically comprises the following steps:
step one, according to the national relevant pollution site survey assessment technology guide rules, the benzene series pollution range in the site soil and underground water is defined, and whether non-aqueous phase liquid exists in the pollution area 1 is found out.
And step two, according to the investigation result of whether the non-aqueous phase liquid exists in the polluted area 1, dredging the soil above the polluted area 1.
Wherein, if non-aqueous phase liquid exists in the polluted area, the dredging depth is not less than 4.5 m; if non-aqueous phase liquid does not exist, the dredging depth is not less than 1.5 m; in the contaminated area 1 of this example, it was confirmed that the residual phase of the light nonaqueous liquid was present, and therefore, the depth of the excavation was determined to be 4.5m, 400m2The soil of 4.5m below the ground in the contaminated area 1 of (2) is dug, and the soil at the bottom and the side walls of the pit is trimmed to ensure the flatness of the surface.
Step three, leveling the bottom of a foundation pit formed by dredging the polluted area 1, and then constructing an aeration layer, wherein the specific construction method comprises the following steps:
3.1, laying a clean quartz sand filter material layer 2 with the thickness of about 10cm, wherein the particle size of the quartz sand filter material is 2-5 mm;
3.2, horizontally arranging the aeration pipe 3 on the quartz sand filter material at the lower layer;
3.3, one end of each aeration pipe 3 is sealed by a pipe plug, and the other end of each aeration pipe is connected to the ground through a UPVC (unplasticized polyvinyl chloride) connecting pipe 4 after being switched through a 90-degree elbow;
and 3.4, continuously paving a clean quartz sand filter material layer 2 with the thickness of about 20 cm, uniformly covering the aeration pipe 3, and flattening the upper surface of the filter material layer 2.
And fourthly, paving the geomembrane 21 on the surface of the leveled filter material layer 2.
Backfilling clean soil with bioactivity on the geomembrane 21, backfilling in layers, compacting each layer properly until the required height of the barrier layer 6 is achieved, wherein the upper surface of the barrier layer 6 is flush with the ground, and the compacted clean soil is required to keep the soil intrinsic permeability coefficient of the barrier layer 6 to be not less than 10-8cm2。
Meanwhile, the clean soil should meet the following requirements:
the water content of the soil is 10-15%, the pH of the soil is 6-9, and the ratio of C in the soil: n: p: the weight ratio of K is 100: 10-15: 1:1, and the number of indigenous microorganisms contained in the clean soil is not less than 105cfu per gram of dry soil.
In this embodiment, the compaction is carried outIntrinsic permeability coefficient of about 10 for post-clean soil-7cm2The water content of the soil is about 12 percent, the pH value is 6.8-8.5, and the microbial quantity is 4 multiplied by 105~8×105cfu per gram of dry soil, the ratio of C to N to P to K is 100:15:1: 1.
And step six, after the clean soil is backfilled and stabilized, arranging layered monitoring gas wells 7 in the unfavorable areas of the aeration flow field in the range of the polluted area 1, and installing soil gas collecting devices 8 at different depth positions in the layered monitoring gas wells 7.
In the embodiment, 79 layered monitoring gas wells are arranged, gas guide devices 81 are arranged at the positions with the depths of 1.5m, 2.5 m, 3.5m and 5m respectively, and 36 sampling positions are designed and distributed in the soil in the polluted area 1 and at different depths of the barrier layer 6.
And step seven, communicating the connecting pipe 4 extending to the upper part of the ground with the aeration fan 5, arranging a pressure gauge 41, a vortex flowmeter 42 and an adjusting valve 43 on the connecting pipe 4, and completing the connection of the aeration system and the variable frequency control system 9.
Step eight, opening aeration fan 5 and governing valve 43, aerating barrier layer 6 to the aerobic degradation efficiency in the regulation barrier layer 6, specific aeration barrier process is as follows:
8.1, supplying air into the aeration pipe 3 through the aeration fan 5, adjusting the aeration quantity through the adjusting valve 43 to adjust the oxygen content in the aeration layer and the barrier layer 6, and controlling the real-time flow of the air in the connecting pipe 4 to be 70-80m3/h；
8.2, air enters the aeration layer through the aeration pipe 3 and enters the barrier layer 6 through gaps among quartz materials of the filter material layer 2, so that the oxygen content in the living environment of microorganisms in the barrier layer 6 is improved, the oxygen content in the clean soil is controlled to be uniformly distributed and not lower than 10%, indigenous microorganisms in the clean soil are subjected to aerobic biodegradation by taking benzene series steam which vertically and upwards migrates from the pollution area 1 as a carbon source and a nitrogen source, and an aerobic biodegradation zone is formed in the barrier layer 6; when the microorganism carries out self-propagation, the benzene series is degraded into low-toxicity or non-toxic metabolites, and the way of the benzene series to vertically migrate upwards is completely cut off;
and 8.3, collecting soil gas samples regularly, detecting and analyzing gas components, determining the oxygen content and the benzene series content in the gas samples, adjusting the aeration amount according to the oxygen content, and when the monitoring result shows that the oxygen content in the soil gas is lower than 10%, properly adjusting the adjusting valve 43 to increase the aeration amount and continuously increase the larger aeration amount to ensure that the oxygen content in the tested soil gas is not lower than 10%.
The sampled soil gas is used for detecting oxygen, carbon dioxide and methane in the collected gas on site by using a portable instrument, and the oxygen content in the clean soil is adjusted in time according to the detection result, so that microorganisms in the clean soil can carry out aerobic biodegradation on benzene series in a good and proper environment, and the vertical migration of the benzene series is effectively blocked, and the benzene series is prevented from entering the surface atmosphere. Meanwhile, the collected gas is sent to a laboratory for detection, GC-MS analysis is carried out, the content of benzene series in the sample gas is detected, and the target pollutants of benzene, toluene, ethylbenzene and styrene are specifically analyzed.
In this embodiment, the bio-barrier system of the present invention is continuously operated for 18 months, during the operation, sampling detection is performed on each monitoring sampling point every month, gas components in the sample are analyzed, and the average monitoring result shows that, in each sampling detection, the concentrations of benzene, toluene, ethylbenzene and styrene in the average sampling monitoring gas sample of 9 sampling monitoring points (the depth of the gas guide device 81 is 5 m) located in the contaminated area 1 exceed 105μg/m3The benzene series concentration in the upper layer of the contaminated area 1 is large. And from the first month of operation, each monitoring sampling point with the depth of 3.5m or more is arranged, so that the concentrations of benzene, toluene, ethylbenzene and styrene in the soil gas are obviously reduced and are basically not detected. The undetected samples are calculated according to half of the detection limit, the barrier efficiency of the biological barrier system for benzene, toluene, ethylbenzene and styrene is respectively 98.0%, 99.8%, 99.7% and 99.2%, and a good barrier effect is achieved.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (10)
1. The biological barrier system for blocking the way of benzene series in the field migrating to the atmosphere is characterized in that: the soil gas monitoring system covers the polluted area (1), sequentially comprises an aeration layer and a blocking layer (6) from bottom to top and further comprises a soil gas monitoring system, wherein the blocking layer (6) is clean soil with biological activity;
the aeration layer comprises a filter material layer (2) laid above the polluted area (1) and an aeration pipe (3) embedded in the filter material layer (2), and the aeration pipe (3) is connected with an aeration fan (5) through a connecting pipe (4);
the soil gas monitoring system comprises a layered monitoring gas well (7) and a soil gas collecting device (8), wherein the layered monitoring gas well (7) is distributed at intervals in the plane range of the polluted area (1); the soil gas collecting device (8) comprises a gas guide device (81) embedded in the layered monitoring gas well (7), an air extracting device and a collecting device which are positioned on the ground; the air guide devices (81) are respectively communicated with an air inlet of an air extraction device on the ground through guide pipes (82), the air guide devices (81) are arranged at intervals along the depth direction of the layered monitoring gas well (7) and are embedded in the air guide material layer (71), the upper side and the lower side of the air guide material layer (71) are respectively paved with an isolation layer (72), and a connecting layer (73) is filled between the isolation layers (72) of the air guide devices (81) which are adjacent up and down.
2. The biological barrier system for blocking the pathway of benzene series in a site to the atmosphere according to claim 1, wherein: the thickness of the filter material layer (2) is not less than 30cm, the filter material layer is formed by laying quartz sand with the particle size of 2-5mm, and the aeration pipes (3) are horizontally arranged and arranged in parallel at intervals.
3. The biological barrier system for blocking the pathway of benzene series in a site to the atmosphere according to claim 1, wherein: one end of the connecting pipe (4) is communicated with the aeration pipe (3), the other end of the connecting pipe vertically extends upwards to the ground and then is connected with the aeration fan (5), and a pressure gauge (41), a vortex flowmeter (42) and an adjusting valve (43) are sequentially connected in series on the connecting pipe (4) on the ground along the air flowing direction.
4. The biological barrier system for blocking the pathway of benzene series in a site to the atmosphere according to claim 1, wherein: aeration gaps are arranged on the aeration pipes (3) at intervals, the aeration gaps are arranged along the axial direction of the aeration pipes (3), the length is not more than 20mm, the width of each aeration gap is not more than 1mm, the distance between every two adjacent aeration gaps on the same aeration pipe (3) is not more than 10mm, and the opening rate on each aeration pipe (3) is not more than 8%.
5. The biological barrier system for blocking the pathway of benzene series in a site to the atmosphere according to claim 1, wherein: and a geomembrane (21) is also arranged between the aeration layer and the barrier layer (6).
6. The biological barrier system for blocking the pathway of benzene series in a site to the atmosphere according to claim 1, wherein: the thickness of the barrier layer (6) is not less than 1.5m when the site of the contaminated area (1) is free of non-aqueous liquid, and the thickness of the barrier layer (6) is not less than 4.5m when the site of the contaminated area (1) is free of non-aqueous liquid.
7. The biological barrier system for blocking the pathway of benzene series in a site to the atmosphere according to claim 1, wherein: the soil intrinsic permeability coefficient of the clean soil is not less than 10-8cm2The water content by weight is 10% -15%, the pH of the soil is 6-9, and the ratio of C in the soil is as follows: n: p: the weight ratio of K is 100: 10-15: 1:1, and the number of indigenous microorganisms contained in the clean soil is not less than 105cfu per gram of dry soil.
8. The biological barrier system for blocking the pathway of benzene series in a site to the atmosphere according to claim 1, wherein: the distance between the upper air guide device and the lower air guide device (81) which are adjacent to each other is not more than 1.5 m; the air guide material layer (71) is formed by paving quartz sand with the particle size of 2-4mm, the thickness is not less than 30cm, the isolation layer (72) is a dry bentonite layer with the thickness not more than 10cm, and the connecting layer (73) is a wet bentonite layer.
9. The biological barrier system for blocking the pathway of benzene series in a site to the atmosphere according to claim 1, wherein: the air inlet of the guide pipe (82) is communicated with the air outlet of the air guide device (81), one end of the air outlet vertically penetrates through the layer of filler to the well mouth upwards, the filler penetrates through the sealing platform (74) located at the well mouth and then is connected with the air extraction device, and the air outlet of the guide pipe (82) is provided with an air tightness valve (83).
10. The method for sequestering a biological barrier system that blocks the pathway of benzene-based species migration to the atmosphere in a site of any of claims 1-9, wherein: the method comprises the following steps:
the method comprises the following steps of firstly, defining the pollution range of benzene series in soil and underground water of a site, and judging the site pollution condition;
step two, according to the site pollution condition in the pollution area (1), cleaning and digging the soil above the pollution area (1);
leveling the bottom of a foundation pit formed by dredging the polluted area (1), constructing an aeration layer, laying a filter material layer (2), arranging an aeration pipe (3) and a connecting pipe (4), and laying the filter material layer (2) above the aeration pipe (3) and leveling;
fourthly, paving a geomembrane (21) on the surface of the leveled filter material layer (2);
backfilling clean soil with bioactivity on the geomembrane (21), backfilling in layers, compacting each layer properly, wherein the upper surface of the barrier layer (6) is flush with the ground, and the compacted clean soil is required to keep the soil intrinsic permeability coefficient of the barrier layer (6) not less than 10-8cm2；
Step six, after the clean soil is backfilled and stabilized, arranging layered monitoring gas wells (7) in the unfavorable areas of the aeration flow field in the range of the polluted area (1), and installing soil gas collecting devices (8) at different depth positions in the layered monitoring gas wells (7);
step seven, communicating a connecting pipe (4) extending to the upper part of the ground with an aeration fan (5) and completing the connection of an aeration system and a variable frequency control system (9);
step eight, opening aeration fan (5) and governing valve (43), aerating barrier layer (6) to the aerobic degradation efficiency in regulation barrier layer (6), specific aeration separation process is as follows:
8.1, supplying air into the aeration pipe (3) through an aeration fan (5) so as to supply oxygen into the barrier layer (6);
8.2, air enters the aeration layer through the aeration pipe (3) and enters the barrier layer (6) through gaps of the filter material layer (2), so that the oxygen content in the living environment of microorganisms in the barrier layer (6) is improved, the oxygen content in the clean soil is controlled to be uniformly distributed and not lower than 10%, indigenous microorganisms in the clean soil are subjected to aerobic biodegradation by taking benzene series steam which vertically and upwardly migrates from the polluted area (1) as a carbon source, and the way that the benzene series vertically and upwardly migrates is blocked;
and 8.3, collecting soil gas samples periodically, detecting and analyzing gas components, determining the oxygen content and the benzene series content in the gas samples, and adjusting aeration quantity according to the oxygen content to ensure the aerobic biodegradation.
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