CN103529190B - 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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- CN103529190B CN103529190B CN201310495166.0A CN201310495166A CN103529190B CN 103529190 B CN103529190 B CN 103529190B CN 201310495166 A CN201310495166 A CN 201310495166A CN 103529190 B CN103529190 B CN 103529190B
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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 the fast development of economy, owing to lacking effective environmental protection, China's soil and groundwater pollution problem is day by day serious.Within 2011, State Council issues " national Groundwater prevention planning (2011-2020) ", and require in a planned way to accelerate to advance groundwater contamination reparation, substantially grasped groundwater contamination situation by 2015, the year two thousand twenty builds up groundwater contamination countermeasure system.Country " 12 " planning also proposes palpus " descending water prevention and cure of pollution intentinonally " especially.For Jiangsu, 2006 ~ 2011, the continuous two-wheeled in Jiangsu Province carried out the Chemical Manufacture enterprise focus efforts on special areas of 6 years by a definite date altogether.For promoting chemical industry developping levels further, determine from 2012 ~ 2014, carry out new round Chemical Manufacture enterprise focus efforts on special areas with 3 years in the whole province 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 of city main city zone, resident concentration zones, drinking water source area all moves out in principle or changes the line of production, closes.These industrial pollution places are administered if do not added or are repaired and directly use the very large environment hidden danger of existence and human health risk.In industrial sites pollutant, volatilization/half volatile has engine dyeing thing to occupy larger proportion, accounts for more than 70%.
Volatile organic contaminant is mainly derived from: the landing oil that (1) petrochemical complex production area, refuelling station etc. are formed or accident leakage, the discharge of oil-containing production waste and the seepage of oil pipeline; (2) chemicals production such as chemical plant, insecticide factory enterprise, the medicine caused 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 spread in soil, thus cause more large-area soil pollution, even penetrate 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 the very effective method of one of volatile organic pollutants in process soil and groundwater, has that cost is low, efficiency is high, manipulation in situ and an advantage such as repair time is short.Ratio in each technology of 1982-2008 US groundwaters pollution " super fund " administration project underground water in-situ immobilization shared by 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 underground water saturation region, air-flow moves upward under buoyancy, part effumability pollutant is driven to volatilize from soil and groundwater and enter air stream, air containing 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, improves the clearance of pollutant further.
Because underground water aeration theoretical research is still in the starting stage, repair mechanisms are reached common understanding not yet completely, cause inevitably occurring in Practical Project that design is unreasonable, causes the wasting of resources, and therefore the inherent mechanism of Study of The Underground water aeration reparation is extremely important.Current China to soil and groundwater pollution effect and recovery technique research less, recovery technique means are relatively weak and lack perfect theoretical system, and management experience is obviously not enough, can not meet soil and groundwater and pollute the extensive needs effectively administered.While the advanced recovery technique of Developed Countries, the domestic basic research also should actively developing 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 and aeration associating gas phase extracting reparation is carried out to volatilization/half volatile organic contaminant in the soil body be under different condition and underground water, various process parameters in process is regulated and monitored simultaneously, water sample can be taked in process of the test in real time to carry out quantitative test, thus to the aeration associating gas phase extracting two dimension test unit that repair process and inherent mechanism are studied.
technical scheme:aeration associating gas phase extracting two dimension test unit of the present invention, comprise two-dimentional test model, the aeration module be connected with two-dimentional test model and gas phase extracting module, two dimension test model comprises model groove, be arranged on the dividing plate that two ends inwall is closed in model groove inside, be arranged on the stephanoporate steel plate of model groove upper end, be arranged on the pressurised airbag on the upside of stephanoporate steel plate, be arranged on the solarization air cap in model groove bottom and pollutant filling orifice, a water tank is connected respectively bottom model groove two ends, pressurised airbag is connected with the first air compressor machine, the connecting tube of water tank and model groove is provided with valve, a side panel of model groove is provided with multiple thief hole.Aeration module comprises the second air compressor machine, air strainer, the first air pressure regulator, the second air pressure regulator, the gentle pressure sensor of first-class gauge that connect successively, baroceptor is connected with solarization air cap by pipeline, or is connected with the air injection tube be arranged in model groove.Gas phase extracting module comprises the gas phase extraction tube, second gauge, active carbon filter, the vacuum pump that connect 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 unsatalation zone by the on-the-spot soil layer of left and right sides cistern water level control reproduction, carries out the underground water aeration test under various complex random systems condition, gas phase extraction test and aeration associating gas phase extraction test on this basis.
(2) this device is also connected to a water tank bottom model groove two ends, adjusts underground water table time they are not only for testing.Can also by the height of adjustment two water tanks, to form certain head difference at model groove two ends, thus can the flowing of simulated groundwater in process of the test, groundwater condition during reduction field repair, with the impact of Study of The Underground water flow on repairing effect.
(3) this device is provided with air pressure regulator, flowmeter and baroceptor, is also provided with multiple thief hole at diverse location place, model groove side simultaneously.By the record of flow meter and baroceptor data, and carry out quantitative test by the liquids and gases sample that thief hole obtains, 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, in the different phase of test is to soil layer, the sampling of diverse location place quantitative test can also be carried out.Adequately achieve renovation technique state modulator and repair overall process pollutant removing rule and monitor in real time.
(4) because this device both can arrange air injection tube in model groove inside, the solarization air cap that model trough floor is arranged also can be utilized to carry out underground water aeration operation respectively, therefore, in experimentation, aeration point can be selected flexibly.When carrying out aeration operation by base plate solarization air cap, be convenient to carry out systematic study to the soil body in model casing and underground water situation, because aerating pipelines formation and underground water do not disturb, be conducive to carrying out aeration mechanism research specially.And when carrying out aeration by the air injection tube stretching into certain depth in soil layer from top to bottom, more meet on-the-spot real working condition, therefore can 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 morely to carry out aeration in experimentation.Therefore, this device is utilized to carry out single hole aeration test, porous aeration test can also be carried out, to study influencing each other, for determining during rig-site utilization that the superior distance of aeration well provides experimental study foundation between the coverage of single aeration well and multiple aeration well.
(6) device top has stephanoporate steel plate to be placed in soil layer end face, carries out entirety and fixes, then can pressurize to soil layer with air bag, thus simulate the stress state suffered by different depth soil layer by applying the larger steelframe of rigidity outward at device.
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 that on each panel of model groove, sampling spot and connecting hole arrange schematic diagram.
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-class gauge; 25, baroceptor; 26, air injection tube; 30, gas phase extraction tube; 31, second gauge; 32, active carbon filter; 33, vacuum pump; 40, connecting hole.
Embodiment
Below in conjunction with Figure of description and embodiment, the present invention is illustrated the most further.
As shown in Figure 1, Figure 2 and Figure 3, in aeration associating gas phase extracting two dimension test unit of the present invention, two-dimentional test model, the aeration module be connected with two-dimentional test model and gas phase extracting module is comprised.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 end stephanoporate steel plate 12, be arranged on pressurised airbag 13 on the upside of stephanoporate steel plate 12, be arranged on solarization air cap 14 on model groove 10 bottom surface and pollutant filling orifice 15, a water tank 16 is connected respectively bottom model groove 10 two ends, pressurised airbag 13 is connected with the first air compressor machine 17, water tank 16 and the connecting tube of model groove 10 are provided with valve 18, a side panel of model groove 10 is provided with thief hole 19; Aeration module comprises the second air compressor machine 20, air strainer 21, first air pressure regulator 22, second air pressure regulator 23, first-class gauge 24 and the baroceptor 25 that connect successively, baroceptor 25 is connected with solarization air cap 14 by pipeline, or is connected with the air injection tube 26 be arranged in model groove 10; Gas phase extracting module comprises the gas phase extraction tube 30, second gauge 31, active carbon filter 32, the vacuum pump 33 that connect successively, and the main body of gas phase extraction tube 30 is arranged on model groove 10 top, and it is outside that exhausr port is arranged on model groove 10.Dividing plate 11 comprises porous organic glass, geotextile and the pore woven wire that ecto-entad sets gradually.
In addition, first-class gauge 24, second gauge 31 and baroceptor 25 are connected to computerized data acquisition device 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 are pvc pipe, and internal diameter is 25 mm, and is connected with model groove 10 by connecting hole 40.The material connecting water tank 16 used with model groove 10 is emulsion tube, and emulsion tube is connected with model groove 10 by connecting hole 40.Spacing between the solarization air cap of three, model groove 10 bottom surface is 20 cm.Model groove 10 side is provided with the thief hole 19 that 4 row 7 arrange 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.First air compressor machine 17 air capacity is less than 150 L/min, and top pressure is 0.8 ~ 1MPa.Vacuum pump 33 flow is 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-class gauge 24 and second gauge 31 is 0 ~ 10 L/min.
Apparatus of the present invention are in use:
(1) when only carrying out aeration test, can gas phase extraction tube 30 in removal device and vacuum pump 33.First will test soil sample to load in model groove 10 by specific dry density, then distilled water is slowly injected by the bottom of water tank 16 from device, reaches the height of specifying, then valve-off 18, is intended to controlling groundwater level height.Pollutant can inject from the pollutant filling orifice 15 in the middle of model groove 10 bottom surface, also can be mixed injection soil layer with water.Finally, isolated operation aerating system, and selected good technological parameter (the aeration point degree of depth, aeration pressure/flow etc.), make air from the solarization air cap 14 injection test soil layer air injection tube 26 or model groove 10 base plate.Can the parameter such as Real-Time Monitoring aeration pressure and aerate flux in process of the test, simultaneously can test different phase, at the diverse location place of soil layer sampling carry out quantitative test.
(2) when carrying out aeration associating gas phase extraction test, first the dry density of test soil sample by setting loaded in model groove, then de aerated water is slowly injected bottom device both sides by water tank 16, until underground water table reaches specified altitude assignment, and then valve-off 18.Pollutant can inject from the pollutant filling orifice 15 in the middle of model groove 10 base plate, also can be mixed injection soil layer with water.Finally, run gas phase extraction system and aerating system successively, and selected good technological parameter, make air inject soil layer from the solarization air cap 14 air injection tube 26 or model groove 10 base plate, then extracted out by gas phase extraction tube 30 at unsatalation zone.Can the parameter such as Real-Time Monitoring aeration pressure, aerate flux, vacuum pressure and extracting flow in process of the test, simultaneously can test different phase, at the diverse location place of soil layer sampling carry out quantitative test.
(3) owing to relating to the removal of volatile contaminant in aeration test process, therefore device top cover is generally sealing.If but do not add volatile organic contaminant in test, and be only nowed forming and the characteristics of motion of research air, then top cover is without the need to sealing.
(4) when simulating aeration test or the aeration associating gas phase extraction test of deep soil layer, certain evenly load is applied by pressurised airbag 13 at soil layer top, to simulate vertical stress suffered by deep soil.In addition, the steelframe using rigidity larger around device is needed to reinforce, to provide enough counter-forces when load application.
(5) in process of the test, if need the flowing of simulated groundwater, flexible pipe is used owing to connecting water tank 16, therefore by opening valve 18, then water tank 16 liquid level of the model casing left and right sides is made to keep certain head difference, to form certain current gradient, thus realize the flowing of water, reduce on-the-spot hydrogeological condition more truly.
(6) when needing in process of the test to take water sample (or gas) to carry out gas chromatographic analysis, adopt 5.0 ml glass syringes to extract at thief hole 19 place, wherein thief hole place adopts Medical rubber plug to close, so that pin hole is sampled and closed.
Claims (2)
1. an aeration associating gas phase extracting two dimension test unit, it is characterized in that, this device comprises two-dimentional test model, the aeration module be 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 the solarization air cap (14) on model groove (10) base plate and pollutant filling orifice (15), a water tank (16) is connected respectively bottom model groove (10) two ends, described pressurised airbag (13) is connected with the first air compressor machine (17), described two water tanks (16) and the connecting tube of model groove (10) are provided with valve (18), a side panel of model groove (10) is provided with multiple thief hole (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-class gauge (24) and the baroceptor (25) that connect successively, described baroceptor (25) is connected with solarization air cap (14) by pipeline, or is connected with the air injection tube (26) be arranged in model groove (10);
Described gas phase extracting module comprises the gas phase extraction tube (30), second gauge (31), active carbon filter (32), the vacuum pump (33) that connect successively, the main body of described gas phase extraction tube (30) is arranged on model groove (10) top, and it is outside that exhausr port is arranged on model groove (10).
2. aeration associating gas phase extracting two dimension test unit as claimed in claim 1, it 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104569323B (en) * | 2015-02-15 | 2016-02-03 | 中国地质科学院水文地质环境地质研究所 | A kind of natural precipitation analogue experiment method based on groundwater dynamic simulation experiment platform |
| CN104569322B (en) * | 2015-02-15 | 2016-02-10 | 中国地质科学院水文地质环境地质研究所 | A kind of construction method of groundwater dynamic simulation experiment platform |
| CN104569321B (en) * | 2015-02-15 | 2016-02-17 | 中国地质科学院水文地质环境地质研究所 | A kind of earth's surface based on groundwater dynamic simulation experiment platform and pollution of underground aquifers source analogue experiment method |
| 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 |
| CN108405604B (en) | 2018-02-11 | 2020-08-21 | 中国环境科学研究院 | Oily sludge microbial degradation and aeration-extraction combined treatment station and treatment 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 |
| 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 |
| 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 |
| 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 |
| 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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| AU2702595A (en) * | 1994-06-10 | 1996-01-05 | Thermatrix Inc. | Method and apparatus for in situ soil remediation |
| US6284133B1 (en) * | 1995-11-13 | 2001-09-04 | Shell Oil Company | Bio aerator |
| CN203231751U (en) * | 2013-02-06 | 2013-10-09 | 清华大学 | Simulation test system of underground water aeration repairing process |
| CN103148838A (en) * | 2013-02-06 | 2013-06-12 | 清华大学 | Groundwater aeration repair process simulation test system and method |
| CN203184331U (en) * | 2013-03-13 | 2013-09-11 | 童翼飞 | Combined repair system for soil and underwater repair |
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