CN103529190A - Aeration and vapor extraction combination two-dimensional testing device - Google Patents
Aeration and vapor extraction combination two-dimensional testing device Download PDFInfo
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- CN103529190A CN103529190A CN201310495166.0A CN201310495166A CN103529190A CN 103529190 A CN103529190 A CN 103529190A CN 201310495166 A CN201310495166 A CN 201310495166A CN 103529190 A CN103529190 A CN 103529190A
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Abstract
The invention discloses an aeration and vapor extraction combination two-dimensional testing device. The device comprises a two-dimensional testing model, an aeration module connected with the two-dimensional testing model, and a vapor extraction module, wherein the aeration module is sequentially connected with a second air compressor, an air filter, a first pressure regulating valve, a second pressure regulating valve, a first flowmeter and a pressure sensor; the vapor extraction module is sequentially connected with a vapor extraction pipe, a second flowmeter, an activated carbon filter and a vacuum pump. The device can be used for performing underground water aeration tests, vapor phase extraction tests and aeration and vapor extraction combination tests on various soil conditions; parameters, mainly including aeration pressure, aeration flow rate, extraction flow rate and the like, can be monitored in real time in the testing process; water samples or gas samples in different positions of soil can be quantitatively analyzed in different stages of each test.
Description
Technical field
The present invention relates to a kind of aeration two dimension test unit, particularly relate to aeration associating gas phase extracting two dimension test unit.
Background technology
Along with economic fast development, owing to lacking effective environmental protection, China's soil and groundwater pollution problem is day by day serious.State Council's issue " national underground water control program (2011-2020) " in 2011, requires in a planned way to accelerate to advance groundwater contamination reparation, the basic groundwater contamination situation of grasping by 2015, and the year two thousand twenty builds up groundwater contamination and prevents and treats system.Country " 12 " planning is the special palpus " descending intentinonally water prevention and cure of pollution " that proposes also.Take Jiangsu as example, and 2006 ~ 2011 continuous two-wheeleds in Nian， Jiangsu Province have been carried out the Chemical Manufacture enterprise focus efforts on special areas of 6 years by a definite date altogether.For further promoting chemical industry development level, determine from 2012～2014, with 3 years, in the whole province, carry out new round Chemical Manufacture enterprise focus efforts on special areas again, be intended to improve chemical industry environmental protection and security level comprehensively, advance the high-end development of chemical industry, Transformation Development, green Compact development.Expect the end of the year in 2014; the whole province's Chemical Manufacture enterprise safety operation standard and environment containment standard all reach relevant national standard requirement, and the Chemical Manufacture enterprise on main city, city, resident concentration zones, drinking water source ground all moves out in principle or changes the line of production, closes.These industrial pollution places are administered or are repaired if do not added and directly use and will have very large environment hidden danger and human health risk.In industry contaminated sites thing, volatilization/half volatile has engine dyeing thing to occupy larger proportion, accounts for more than 70%.
Volatile organic contaminant is mainly derived from: the seepage of the landing oil that (1) petrochemical complex production area, refuelling station etc. form or accident leakage, the discharge of oil-containing production waste and oil pipeline; (2) chemicals production such as chemical plant, insecticide factory enterprise, the medicine causing in transit at workshop, packing workshop, drug stock control warehouse and on-site is revealed.A large amount of volatile organic contaminants directly enters in soil, be adsorbed in soil particle surfaces externally and internally, because it has stronger volatility, easily in soil, spread, thereby cause more large-area soil pollution, even be penetrated in underground water, cause serious groundwater contamination, also can work the mischief to earth's surface biological.
Underground water aeration method (AS) grows up from the mid-80, is a kind of very effective method of processing volatile organic pollutants in soil and groundwater, has that cost is low, efficiency is high, former bit manipulation and an advantage such as repair time is short.In 1982-2008 U.S. groundwater contamination " super fund " administration project underground water original position is repaired each technology, the shared ratio of aeration is up to 23%.Underground water aeration method is generally combined with soil vapor extraction method, the ultimate principle of the method is that pressurized air is injected to underground water saturation region, air-flow moves upward under buoyancy, drive part effumability pollutant from soil and groundwater, volatilize and enter air stream, the air that contains pollutant rises to non-saturated region, then adopts soil vapor extraction technology to process.Meanwhile, the fresh air of injection can help aerobe to carry out biodegradation, further improves the clearance of pollutant.
Because underground water aeration theoretical research is still in the starting stage, repair mechanisms are reached common understanding not yet completely, cause inevitably occurring that design is unreasonable in Practical Project, cause the wasting of resources, so the inherent mechanism that Study of The Underground water aeration is repaired are extremely important.China is less to soil and groundwater pollution effect and recovery technique research at present, and recovery technique means relative thin is weak and lack perfect theoretical system, and management experience is obviously not enough, can not meet soil and groundwater and pollute the extensive needs of effectively administering.In the advanced recovery technique of Developed Countries, the domestic basic research that also should actively develop pollution remediation technology.
Summary of the invention
technical matters:the invention provides a kind of for underground water aeration method shop experiment demand, can simulate volatilization/half volatile organic contaminant in the soil body under different condition and underground water is carried out to aeration associating gas phase extracting reparation, various process parameters in process is regulated and monitored simultaneously, in process of the test, can take in real time water sample to carry out quantitative test, thus the aeration that repair process and inherent mechanism are studied associating gas phase extracting two dimension test unit.
technical scheme:aeration associating gas phase extracting two dimension test unit of the present invention, comprise two-dimentional test model, the aeration module being connected with two-dimentional test model and gas phase extracting module, two dimension test model comprises model groove, be arranged on model groove inside and close on the dividing plate of two ends inwall, be arranged on the stephanoporate steel plate of model groove upper end, be arranged on the pressurised airbag of stephanoporate steel plate upside, be arranged on solarization air cap and pollutant filling orifice in model groove bottom, bottom, model groove two ends connects respectively a water tank, pressurised airbag is connected with the first air compressor machine, on the connecting tube of water tank and model groove, be provided with valve, on a side panel of model groove, be provided with a plurality of thief holes.Aeration module comprises the second air compressor machine, air strainer, the first air pressure regulator, the second air pressure regulator, first flow meter and the baroceptor connecting successively, baroceptor is connected with solarization air cap by pipeline, or is connected with the air injection tube in being arranged on model groove.Gas phase extracting module comprises gas phase extraction tube, the second flowmeter, active carbon filter, the vacuum pump connecting successively, and the main body of gas phase extraction tube is arranged on model groove top, and it is outside that exhausr port is arranged on model groove.
In the present invention, dividing plate comprises porous organic glass, geotextile and the pore woven wire that ecto-entad sets gradually.
beneficial effect:the present invention compared with prior art, has the following advantages:
(1) this device can be reported with reference to Practical Project geological mapping, the situations such as the method simulated field soil body layering of employing layering filling soil sample and heterogeneous body, saturated and the unsaturation band by the on-the-spot soil layer of left and right sides cistern water level control reproduction, carries out underground water aeration test, gas phase extraction test and aeration associating gas phase extraction test under various complicated soil layer conditions on this basis.
(2) this device is also connected with respectively a water tank in model groove two ends bottoms, and they are not only to adjust underground water table when testing.Can also be by regulating the height of two water tanks, to form certain head difference at model groove two ends, thereby can be in process of the test the flowing of simulated groundwater, groundwater condition during reduction field repair, the impact with Study of The Underground water flow on repairing effect.
(3) this device is provided with air pressure regulator, flowmeter and baroceptor, also at diverse location place, model groove side, is provided with a plurality of thief holes simultaneously.By the record to flowmeter and baroceptor data, and the liquids and gases sample of obtaining by thief hole carries out quantitative test, make can control in real time and monitor various process parameters in process of the test, mainly comprise aeration pressure, aerate flux, vacuum pressure and extracting flow etc.Meanwhile, can also the different phase of test to soil layer in diverse location place sampling carry out quantitative test.Fully realized the control of renovation technique parameter and repaired overall process pollutant removing rule and monitor in real time.
(4) because this device both can arrange air injection tube in model groove inside, also can utilize the solarization air cap arranging in model trough floor to carry out respectively underground water aeration operation, therefore, in experimentation, aeration point can be selected flexibly.While carrying out aeration operation by base plate solarization air cap, be convenient to the soil body in model casing and underground water situation to carry out systematic study, because aerating pipelines does not disturb stratum and underground water, be conducive to carry out specially aeration mechanism research.And when stretching into the air injection tube of certain depth in soil layer from top to bottom and carry out aeration, more meet on-the-spot real working condition, therefore at utmost simulated field renovation technique as the impact on repairing effect such as the aeration well point degree of depth, aeration well diameter, aeration tube segment length, aeration tube and soil layer contact conditions.
(5) this device is provided with three solarization air caps altogether in model groove bottom, can select one or more aerations that carry out in experimentation.Therefore, utilize this device can carry out single hole aeration test, can also carry out porous aeration test, to study influencing each other between the coverage of single aeration well and a plurality of aeration well, during for rig-site utilization, determine that the optimum spacing of aeration well provides experimental study foundation.
(6) device top has stephanoporate steel plate to be placed in soil layer end face, by applying steelframe that rigidity is larger and carry out integral body and fix device being outer, then with air bag, can pressurize to soil layer, thereby simulate the suffered stress state of different depth soil layer.
Accompanying drawing explanation
Fig. 1 is apparatus structure schematic diagram of the present invention.
Fig. 2 is the another kind of method of attachment schematic diagram of apparatus of the present invention.
Fig. 3 is sampling spot and connecting hole layout schematic diagram on each panel of model groove.
In figure: 10, model groove; 11, dividing plate; 12, stephanoporate steel plate; 13, pressurised airbag; 14, solarization air cap; 15, pollutant filling orifice; 16, water tank; 17, the first air compressor machine; 18, valve; 19, thief hole; 20, the second air compressor machine; 21, air strainer; 22, the first air pressure regulator; 23, the second air pressure regulator; 24, first flow meter; 25, baroceptor; 26, air injection tube; 30, gas phase extraction tube; 31, the second flowmeter; 32, active carbon filter; 33, vacuum pump; 40, connecting hole.
Embodiment
Below in conjunction with Figure of description and embodiment, the present invention is the most further illustrated.
As shown in Figure 1, Figure 2 and Figure 3, in aeration associating gas phase extracting two dimension test unit of the present invention, comprise two-dimentional test model, the aeration module being connected with two-dimentional test model and gas phase extracting module.Two dimension test model comprises model groove 10, be arranged on model groove 10 inner and close on two ends inwall dividing plate 11, be arranged on model groove 10 upper ends stephanoporate steel plate 12, be arranged on stephanoporate steel plate 12 upsides pressurised airbag 13, be arranged on solarization air cap 14 and pollutant filling orifice 15 on model groove 10 bottom surfaces, model groove 10 bottoms, two ends connect respectively a water tank 16, pressurised airbag 13 is connected with the first air compressor machine 17, on the connecting tube of water tank 16 and model groove 10, be provided with valve 18, on a side panel of model groove 10, be provided with thief hole 19; Aeration module comprises the second air compressor machine 20, air strainer 21, the first air pressure regulator 22, the second air pressure regulator 23, first flow meter 24 and the baroceptor 25 connecting successively, baroceptor 25 is connected with solarization air cap 14 by pipeline, or is connected with the air injection tube 26 in being arranged on model groove 10; Gas phase extracting module comprises gas phase extraction tube 30, the second flowmeter 31, active carbon filter 32, the vacuum pump 33 connecting successively, and the main body of gas phase extraction tube 30 is arranged on model groove 10 tops, and exhausr port is arranged on model groove 10 outsides.Dividing plate 11 comprises porous organic glass, geotextile and the pore woven wire that ecto-entad sets gradually.
In addition, first flow meter 24, the second flowmeter 31 and baroceptor 25 are connected to computer data collector by data line.The length of model groove 10 is 110 cm, and width is 10 cm, is highly 90 cm, and material is organic glass.Gas phase extraction tube 30 and air injection tube 26 material used is pvc pipe, and internal diameter is 25 mm, and is connected with model groove 10 by connecting hole 40.Connecting water tank 16 and model groove 10 material used is emulsion tube, and emulsion tube is connected with model groove 10 by connecting hole 40.Spacing between the solarization air cap of three of 10 bottom surfaces of model groove is 20 cm.Model groove 10 sides are provided with the thief hole 19 of 4 row 7 row altogether, and its horizontal spacing is 10 cm, and longitudinal pitch is followed successively by 11,12 and 11 cm from top to bottom.The internal diameter of all thief holes is 1.5 cm, and external diameter is 2.0 cm.Dividing plate 11 is 10 cm with the spacing at model groove 10 two ends, and the aperture of dividing plate 11 pore woven wire used is 0.5 mm.The first air compressor machine 17 air capacities are less than 150 L/min, and top pressure is 0.8 ~ 1MPa.Vacuum pump 33 flows are 20 ~ 50 L/min, and vacuum tightness is less than 30kPa.The range of adjustment of the first air pressure regulator 22 is 0 ~ 200 kPa, and the range of adjustment of the second air pressure regulator 23 is 0 ~ 15 kPa.The measurement range of first flow meter 24 and the second flowmeter 31 is 0 ~ 10 L/min.
Apparatus of the present invention are in use:
(1) in the situation that only carrying out aeration test, gas phase extraction tube 30 and vacuum pump 33 in can removal device.First test soil sample is packed in model groove 10 by specific dry density, then distilled water is slowly injected from the bottom of device by water tank 16, reaches the height of appointment, and then valve-off 18, are intended to controlling groundwater level height.Pollutant can inject by the pollutant filling orifice in the middle of bottom surfaces 15 from model groove 10, also can with the water injection soil layer that is mixed.Finally, isolated operation aerating system, and selected good technological parameter (the aeration point degree of depth, aeration pressure/flow etc.), make the solarization air cap 14 injection test soil layers of air from air injection tube 26 or model groove 10 base plates.Can Real-Time Monitoring aeration pressure in process of the test and the parameter such as aerate flux, simultaneously can be in test different phase, in the sampling of the diverse location place of soil layer, carry out quantitative test.
(2) when carrying out aeration associating gas phase extraction test, first test soil sample is packed in model groove by the dry density of setting, then de aerated water is slowly injected from installing bottom, both sides by water tank 16, until underground water table reaches specified altitude assignment, then valve-off 18.Pollutant can inject by the pollutant filling orifice in the middle of base plates 15 from model groove 10, also can with the water injection soil layer that is mixed.Finally, move successively gas phase extraction system and aerating system, and selected good technological parameter, make the solarization air cap 14 of air from air injection tube 26 or model groove 10 base plates inject soil layer, then at unsaturation band, by gas phase extraction tube 30, extract out.Can Real-Time Monitoring aeration pressure in process of the test, the parameter such as aerate flux, vacuum pressure and extracting flow, simultaneously can be in test different phase, in the sampling of the diverse location place of soil layer, carry out quantitative test.
(3), owing to relating to the removal of volatile contaminant in aeration test process, therefore install top cover and generally seal.If but do not add volatile organic contaminant in test, and be only nowed forming and the characteristics of motion of research air, top cover is without sealing.
(4) when the aeration test of simulation deep soil layer or aeration associating gas phase extraction test, can at soil layer top, apply certain evenly load by pressurised airbag 13, to simulate the suffered vertical stress of deep soil.In addition, when load application, need to use the steelframe that rigidity is larger to reinforce around at device, so that enough counter-forces to be provided.
(5) in process of the test, if need flowing of simulated groundwater, due to what connect water tank 16 uses, it is flexible pipe, therefore can be by opening valve 18, then make water tank 16 liquid levels of the model casing left and right sides keep certain head difference, to form certain current gradient, thereby realize flowing of water, reduce more truly on-the-spot hydrogeological condition.
(6) while needing to take water sample (or gas) to carry out gas chromatographic analysis in process of the test, adopt 5.0 ml glass syringes to extract at thief hole 19 places, wherein thief hole place adopts the sealing of medical grade rubber plug, so that pin hole sampling and sealing.
Claims (2)
1. an aeration is combined gas phase extracting two dimension test unit, it is characterized in that, this device comprises two-dimentional test model, the aeration module being connected with described two-dimentional test model and gas phase extracting module, described two-dimentional test model comprises model groove (10), be arranged on described model groove (10) inner and close on the dividing plate (11) of two ends inwall, be arranged on the stephanoporate steel plate (12) of model groove (10) upper end, be arranged on the pressurised airbag (13) of described stephanoporate steel plate (12) upside, be arranged on solarization air cap (14) and pollutant filling orifice (15) on model groove (10) base plate, bottom, model groove (10) two ends connects respectively a water tank (16), described pressurised airbag (13) is connected with the first air compressor machine (17), on the connecting tube of described water tank (16) and model groove (10), be provided with valve (18), on a side panel of model groove (10), be provided with a plurality of thief holes (19),
Described aeration module comprises the second air compressor machine (20), air strainer (21), the first air pressure regulator (22), the second air pressure regulator (23), first flow meter (24) and the baroceptor (25) connecting successively, described baroceptor (25) is connected with solarization air cap (14) by pipeline, or is connected with the air injection tube (26) in being arranged on model groove (10);
Described gas phase extracting module comprises gas phase extraction tube (30), the second flowmeter (31), active carbon filter (32), the vacuum pump (33) connecting successively, the main body of described gas phase extraction tube (30) is arranged on model groove (10) top, and exhausr port is arranged on model groove (10) outside.
2. aeration associating gas phase extracting two dimension test unit as claimed in claim 1, is characterized in that, described dividing plate (11) comprises porous poly (methyl methacrylate) plate, geotextile and the pore woven wire that ecto-entad sets gradually.
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| CN104569323A (en) * | 2015-02-15 | 2015-04-29 | 中国地质科学院水文地质环境地质研究所 | Natural rainfall simulation experimental method based on underground water dynamic simulation experimental platform |
| CN104569321A (en) * | 2015-02-15 | 2015-04-29 | 中国地质科学院水文地质环境地质研究所 | Simulation experimental method of pollution source of earth surface and water-bearing stratum based on underground water dynamic simulation experimental platform |
| CN104569322A (en) * | 2015-02-15 | 2015-04-29 | 中国地质科学院水文地质环境地质研究所 | Construction method of underground water dynamic simulation experiment platform |
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| CN109991388A (en) * | 2019-03-26 | 2019-07-09 | 清华大学 | The experimental provision and its experimental method that research volatile organic matter migrates in the soil |
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| CN104569321A (en) * | 2015-02-15 | 2015-04-29 | 中国地质科学院水文地质环境地质研究所 | Simulation experimental method of pollution source of earth surface and water-bearing stratum based on underground water dynamic simulation experimental platform |
| CN104569322A (en) * | 2015-02-15 | 2015-04-29 | 中国地质科学院水文地质环境地质研究所 | Construction method of underground water dynamic simulation experiment platform |
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| CN107607693B (en) * | 2017-11-08 | 2023-09-15 | 徐州中矿大贝克福尔科技股份有限公司 | Device and method for rapidly testing long-term stability of underground solidified body of polluted soil |
| US10611653B2 (en) | 2018-02-11 | 2020-04-07 | Chinese Research Academy Of Environmental Sciences | System and method for combined microorganism degradation and air sparging-soil vapor extraction of oil-containing sludge |
| CN108405604A (en) * | 2018-02-11 | 2018-08-17 | 中国环境科学研究院 | Oily sludge microbial degradation and aeration-extracting Combined Treatment station and processing method |
| CN109047302B (en) * | 2018-06-27 | 2021-03-30 | 东南大学 | Low-permeability-area VOCs polluted underground water in-situ aeration remediation method |
| CN109047302A (en) * | 2018-06-27 | 2018-12-21 | 东南大学 | A kind of hyposmosis area VOCs polluted underground water original position aeration restorative procedure |
| CN109799257B (en) * | 2019-01-28 | 2020-03-31 | 中国科学院武汉岩土力学研究所 | Test system for thermal evaporation displacement repair of organic contaminated soil body |
| CN109799257A (en) * | 2019-01-28 | 2019-05-24 | 中国科学院武汉岩土力学研究所 | A kind of organic contamination soil body heat steaming displacement repairing test system |
| CN109991388A (en) * | 2019-03-26 | 2019-07-09 | 清华大学 | The experimental provision and its experimental method that research volatile organic matter migrates in the soil |
| CN109991388B (en) * | 2019-03-26 | 2020-09-11 | 清华大学 | Experimental device and experimental method for researching migration of volatile organic compounds in soil |
| CN110245385A (en) * | 2019-05-17 | 2019-09-17 | 东南大学 | A kind of aeration discrete element numerical simulation method considering gas-liquid-solid three-phase coupling |
| CN110245385B (en) * | 2019-05-17 | 2023-05-26 | 东南大学 | Aeration discrete element numerical simulation method considering gas-liquid-solid three-phase coupling |
| CN110548756A (en) * | 2019-08-20 | 2019-12-10 | 东南大学 | Plastic drainage plate in-situ vapor extraction repairing device and repairing method thereof |
| CN112285321A (en) * | 2020-10-09 | 2021-01-29 | 合肥工业大学 | VOCs polluted soil body aeration repair test device and test method |
| CN112285321B (en) * | 2020-10-09 | 2021-06-01 | 合肥工业大学 | VOCs polluted soil body aeration repair test device and test method |
| CN112684111A (en) * | 2020-12-16 | 2021-04-20 | 合肥工业大学 | Aeration strengthening test device and method for surfactant in polluted soil |
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