CN212069924U - Biological barrier system for blocking path of benzene series in field to move to atmosphere - Google Patents
Biological barrier system for blocking path of benzene series in field to move to atmosphere Download PDFInfo
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- CN212069924U CN212069924U CN202020188534.2U CN202020188534U CN212069924U CN 212069924 U CN212069924 U CN 212069924U CN 202020188534 U CN202020188534 U CN 202020188534U CN 212069924 U CN212069924 U CN 212069924U
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Abstract
The utility model relates to a pollute place risk management and control technical field, a biological separation system for blocking benzene series thing in place to atmospheric migration way is disclosed. The utility model covers 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 utility model discloses with low costs, the normal position blocks, and no secondary pollution, economic environmental protection, the separation is effectual.
Description
Technical Field
The utility model relates to a pollute place risk management and control technical field, concretely relates to a biological separation system for blocking benzene series thing in place to atmospheric migration way.
Background
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.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a with low costs, the normal position is blocked, no secondary pollution, economic environmental protection, it is effectual to the separation of benzene series thing, can the breathing of effective control benzene series thing expose healthy risk target be arranged in blocking the biological separation system of benzene series thing to atmospheric migration way in the place.
The utility model provides an extremely easy secondary pollution condition that produces among the traditional soil repair technology, cut off the way that benzene series thing migrated in to the atmosphere, avoided the waste gas that produces among the soil repair process to atmospheric pollution, economic environmental protection, the repair cycle length.
The utility model discloses block the biological separation system that benzene series thing moved the way to the atmosphere in place, cover directly over the contaminated area, include aeration layer and barrier layer from bottom to top in proper order, still include soil gas monitoring system, the barrier layer is the clean soil that has 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 utility model discloses block in the place benzene series thing to the biological separation system of atmospheric migration way, it is further, the thickness of precoat is not less than 30cm, lays for particle diameter 2-5 mm's quartz sand and forms, the aeration pipe level sets up, and parallel interval arranges.
The utility model discloses block in the field soil benzene series thing to the biological separation system of atmospheric migration way, it is further, connecting pipe one end and aeration pipe intercommunication, the other end is vertical upwards to extend subaerial back and be connected with the aeration fan, and it has manometer, vortex flowmeter and governing valve to be located to establish ties in proper order along the air flow direction on the subaerial connecting pipe.
The utility model discloses block in the place benzene series thing to the biological separation system of atmospheric migration way, it is further, the interval is provided with the aeration seam on the aeration pipe, and the aeration seam sets up along the axial of aeration pipe, and length is not more than 20mm, and aeration seam width is not more than 1mm, and the distance between the adjacent aeration seam on the same root aeration pipe is not more than 10mm, and the rate of cracking on every aeration pipe is not more than 8%.
The utility model discloses block in the place benzene series thing to the biological separation system of atmospheric migration way, it is further, still be provided with the geomembrane between aeration layer and the barrier layer.
The utility model discloses block in the place benzene series thing to the biological separation system of atmospheric migration way, it is further, when the soil of pollution zone does not have non-aqueous phase liquid to exist, the thickness of barrier layer is not less than 1.5m, and when the soil of pollution zone exists non-aqueous phase liquid, the thickness of barrier layer must not be less than 4.5 m.
The utility model discloses block in place benzene series thing to the biological separation system of atmospheric migration way, it is further, the soil intrinsic permeability coefficient of clean soil is not less than 10-8 cm2The 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 utility model discloses block the biological separation system of benzene series thing to the atmospheric migration way in place, further, the distance between upper and lower adjacent 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 utility model discloses block the biological separation system of benzene series thing to atmospheric migration way in the place, it is further, pipe air inlet and air guide device gas outlet intercommunication, gas outlet one end is vertical upwards to pass and packs to the well head layer upon layer, passes the sealing platform back air exhaust device who is located the well head and connects, and the gas outlet department of pipe is provided with the gas tightness valve.
The utility model discloses block in the place benzene series thing to the biological separation system of atmospheric migration way and have following beneficial effect:
for the petroleum hydrocarbon pollution place taking benzene series as the main, benzene series steam in the soil vertically migrates upward in the soil space of the aeration zone, in the utility model, the benzene series steam migrates upward to pass through the aeration layer to enter the barrier layer, in the barrier layer, microorganisms in the clean soil are subjected to aerobic biodegradation with the benzene series under the condition that the micro-ecological environment such as moisture, oxygen concentration and the like is appropriate, so as to degrade the benzene series into nontoxic 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 utility model discloses biological separation system is better to the separation effect of benzene series thing, and after the continuous operation, the separation rate to benzene series thing vapour is not less than 98%, can block the migration way of benzene series thing basically, avoids its pollution to the atmosphere.
Description of the drawings:
figure 1 is a front view of the biological 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 fig. 1-3, the utility model discloses block in the place biological separation system of benzene series thing to atmospheric migration way, cover directly over contaminated area 1, include aeration layer and barrier layer 6 from bottom to top in proper order, still include soil gas monitoring system and 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 10-8 cm2The 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 a soil gas collecting device 8 arranged in the layered monitoring gas wells 7, the layered monitoring gas wells 7 are distributed at intervals in the plane range of a polluted area 1, the distance between every two adjacent layered monitoring gas wells 7 is not less than 4m, the layered monitoring gas wells 7 are located between every two adjacent aeration pipes 3, the layered monitoring gas wells are more preferably arranged on the central positions with the same distance between every two adjacent aeration pipes 3, when the layered monitoring gas wells 7 are arranged, the arrangement of the areas with the 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 condition can be conveniently and flexibly adjusted according to the difference of the condition, 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 a gas collecting system in a utility model patent CN102288457B named as a portable soil volatile gas collecting system and a collecting method thereof, and can collect soil volatile gas in a layered monitoring gas well 7 at regular time, the soil gas collecting device 8 comprises an air guide device 81 embedded in the layered monitoring gas well 7, an air extractor and a collecting device which are positioned on the ground, the air guide device 81 is respectively communicated with an air inlet of the air extractor on the ground through a guide pipe 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 an air guide material layer 71, and the distance between the upper and lower adjacent air guide devices 81 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; it has articulamentum 73 to fill between upper and lower adjacent air guide 81's the isolation layer 72, articulamentum 73 is wet bentonite layer, be not more than 4mm for the particle diameter, moisture content 25% ~40% wet bentonite, pipe 82 air inlet and air guide 81 gas outlet intercommunication, the vertical upwards of gas outlet one end is passed and is packed to the well head layer upon layer, pass and seal platform 74 back air exhaust device and connect, the gas outlet department of pipe 82 is provided with gas tightness valve 83, be convenient for control opening and closing of sampling, pipe 82 is the nylon tube that the diameter is not less than 4mm, air exhaust device's gas outlet and collection device's air inlet intercommunication, air exhaust device and collection device are above-mentioned utility model CN102288457B in air exhaust device and collection device.
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 20 m), 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 utility model discloses block the method of benzene series thing to the biological separation system of atmospheric migration way in place, specifically include following step:
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 10-8 cm2。
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 the present embodiment, pressIntrinsic permeability coefficient of about 10 for post-construction clean soil-7 cm2The 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 utility model discloses biological separation system continuous operation 18 months, every month carries out the sampling test to each monitoring sampling point in the operation process, and the gas composition in the analysis sample shows on average the monitoring result, and sampling test at every turn is located that the concentration of benzene, toluene, ethylbenzene and styrene all exceeds 10 in the average sampling monitoring gas sample of 9 sampling monitoring points (air guide device 81 sets up degree of depth 5 m) in the contaminated area 15μg/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. Will not examine the sample and calculate according to half of the detection limit, the utility model discloses biological separation system is 98.0%, 99.8%, 99.7% and 99.2% respectively to the separation efficiency of benzene, toluene, ethylbenzene, styrene, reaches fine separation effect.
The above-mentioned embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.
Claims (8)
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 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.
8. 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).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111266402A (en) * | 2020-02-20 | 2020-06-12 | 北京市环境保护科学研究院 | Biological barrier system and method for blocking path of benzene series in field to move to atmosphere |
| CN114160559A (en) * | 2021-11-16 | 2022-03-11 | 辽宁中博生态环境技术有限公司 | Organic contaminated soil management and control disposal system and application thereof |
| CN115463957A (en) * | 2022-10-11 | 2022-12-13 | 中国地质调查局水文地质环境地质调查中心 | Multistage injection well system for in-situ soil and underground water pollution remediation and installation method |
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2020
- 2020-02-20 CN CN202020188534.2U patent/CN212069924U/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111266402A (en) * | 2020-02-20 | 2020-06-12 | 北京市环境保护科学研究院 | Biological barrier system and method for blocking path of benzene series in field to move to atmosphere |
| CN114160559A (en) * | 2021-11-16 | 2022-03-11 | 辽宁中博生态环境技术有限公司 | Organic contaminated soil management and control disposal system and application thereof |
| CN115463957A (en) * | 2022-10-11 | 2022-12-13 | 中国地质调查局水文地质环境地质调查中心 | Multistage injection well system for in-situ soil and underground water pollution remediation and installation method |
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