CN1290632C - Kerb treating process and device for volatile and semi-volatile organic substance polluted soil - Google Patents
Kerb treating process and device for volatile and semi-volatile organic substance polluted soil Download PDFInfo
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- CN1290632C CN1290632C CN 200410056888 CN200410056888A CN1290632C CN 1290632 C CN1290632 C CN 1290632C CN 200410056888 CN200410056888 CN 200410056888 CN 200410056888 A CN200410056888 A CN 200410056888A CN 1290632 C CN1290632 C CN 1290632C
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Abstract
The present invention discloses off-site treating technology for volatile and semivolatile organic substance polluted soil and a device thereof. In the technology, polluted soil is dug out and filled in the device; then, definite vacuum degree can be formed in a pumping drainage well by a vacuum pump; fresh air is endlessly introduced into the polluted soil; the volatilization of pollutants adsorbed by the soil is promoted; and the steam of the pollutants is removed. If the volatility of the pollutants is weak, the polluted soil can be heated, and the volatility of the pollutants is enhanced. The device is formed by that the pumping drainage well of a pumping drainage gas path device, a temperature control sensor and a heating device are embedded into a soil cylinder. The device can quickly and economically implement off-site treatment to volatile organic substance (VOCs) polluted soil and semivolatile organic substance (SVOCs) polluted soil which is difficult to process by a conventional method. The present invention reduces the embedding quantity of hazardous waste and saves processing cost, and the treated soil can be backfilled to an original pollution site or used for other purposes.
Description
Technical field
The invention belongs to environmental protection technical field, particularly a kind of volatility and semi-volatile organic matter contaminated soil are administered technology and device outside the venue.
Background technology
Along with the development of petroleum industry, volatile organic matters such as gasoline, diesel oil (VOCs and) and the pollution of semi-volatile organic matter (SVOCs) in soil environment are increasing.They are mainly from oil spill accident, as breaking of petroleum pipeline, and the seepage of storage tank, and the leakage problem of buried tank etc.In addition, along with the development of chemical engineering industry, various VOCs such as benzene, toluene and carbon tetrachloride also increase gradually to the pollution that soil causes, as arbitrarily toppling over of chemical industry discarded object and chemical agent, and the leakage in chemical plant, the accident in the chemical transport etc.These pollutants can produce many environmental problems: soil physico-chemical property is exerted an influence; Threaten the water quality safety of underground water source; Contaminated air; Owing to accumulating in building basement, the hydrocarbon gas causes explosion danger; Leak hydrocarbon compound and make under the public land that is in contact with it pipe network facilities accelerated ageing etc.Improvement outside the venue to VOCs and SVOCs contaminated soil is that contaminated soil is dug out at present, carries out subsequent treatment again, and employed method has landfill, burning, hydrodynamic cleaning and biological treatment.But all there is shortcoming separately in these methods: though landfill is handled simply, the expense costliness also may face after-treatment; Though it is good to burn treatment effect, the treatment facility complexity, the expense costliness also may produce secondary pollution; The hydrodynamic cleaning waste is serious, and treatment effect is undesirable, needs to handle flushing water; The biological treatment cycle is long, and treatment effect is undesirable, also may produce secondary pollution.People such as Zhang Bingyin are in " rock-soil mechanics " the 25th the 4th phase of volume, in April, 2004, deliver on P544～545 in " in the soil volatilizable pollutant bleed the numerical simulation of removing method " literary composition and mention in being subjected to the soil of volatilizable contaminants, the part of pollutant exists with gaseous form, remainder is with liquid state, the form of solubilised state or ADSORPTION STATE is present in the hole of the soil body, under usual conditions, each alternate pollutant is in dynamic balance state, when vacuum well is set in soil, when bleeding removing with aspiration pump, in vacuum well and surrounding soil, form vacuum, produce barometric gradient, the SOIL GAS that driving contains gaseous contaminant flows to the vacuum well direction of bleeding, air-flow extracting treated being discharged in the atmosphere behind the ground.But this only is the Mathematical Modeling of setting up, and therefore, effective VOCs of exploiting economy and SVOCs contaminated soil improvement technology outside the venue become the problem that needs to be resolved hurrily.By retrieval, do not find relevant publication.
Summary of the invention
The object of the present invention is to provide a kind of volatility and semi-volatile organic matter contaminated soil to administer technology and device outside the venue.Described contaminated soil controlling device outside the venue is that vacuum well is set in soil, and be connected with filter with ground aspiration pump, promptly in the soil tube 13 of the contaminated soil of filling, install by the gas pump-drainage well 1 that is equipped with colored hole, be connected with vacuum meter 3 by wearing wall pipe 19, and connect and compose by pipeline 2 and vavuum pump 8.In the pump drainage air pipe, also be in series with pump drainage gas sampler 4, tail gas charcoal absorption removal device 5, gas flowmeter 6, flow control valve 7; And install by the temperature sensor 9 that inserts contaminated soil in the soil tube 13 of the contaminated soil of filling and is connected with relay 11 by temperature controller 10, heating tape 12 layerings are imbedded in the interior contaminated soil 14 of soil tube 13, and are connected with relay 11.
Described gas releaser is in gas pump-drainage well 1, and the gas pipeline 15 that the expanding cement 17 on its top is equipped with peastone 16 and ventilation with the bottom is fixed on central authorities, and its top connects cement gauge seal lid 18, and the connection suitable for reading of gas pipeline 15 is worn wall pipe 19 and constituted.
Described volatility and semi-volatile organic matter contaminated soil are administered technology outside the venue: at first, volatilized property and semi-volatile organic matter contaminated soil are dug out from the scene of polluting, layering then (every layer of about 2cm height) evenly is packed into treating apparatus, guarantee that bulk density everywhere is identical; Restart vavuum pump 8, slow turn-on flow rate control valve 7 makes the reading of gas flowmeter 6 reach the reservation value of pump drainage gas flow, at this moment can read vacuum pressure value the gas pump-drainage well 1 from vacuum meter 3.When vavuum pump is worked, because ambient atmosphere pressure is higher than pressure in the pump-drainage well 1, fresh air constantly enters in the contaminated soil from atmosphere, formed towards the gas flowfield of pump-drainage well direction motion, promote the volatilization of the organic pollution that soil is adsorbed and bring its steam into gas pump-drainage well 1, be transported to tail gas charcoal absorption removal device 5 through gas pipeline 2 again and filter, give off the tail gas that meets atmospheric emission standard at last.From gas sampling device 4, gather the organic pollution steam, can weigh the degree of purification of contaminated soil and whether reach the design governance standard by measuring its concentration.At last, treated soil is backfilling into former pollued field or uses it for anything else.
As the volatility of pollutant a little less than, can use the temperature control heating system that contaminated soil is heated, improve the volatility of its pollutant.Connect heating power supply after starting vavuum pump, the 12 pairs of contaminated soils in heating tape are heated, by the temperature sensor 9 that is embedded in the contaminated soil signal is passed to temperature controller 10 simultaneously, the heating-up temperature of control contaminated soil: when temperature surpasses design temperature, temperature controller commands relays 11 disconnects heating power supply, stops the heating of ribbon heater to soil; When temperature drops to when being lower than design temperature, the temperature controller commands relays is closed heating power supply, heats to soil once more.In this way, this temperature control heating system can be controlled soil moisture maintenance and be substantially constant at the temperature that sets.
The invention has the beneficial effects as follows that energy is convenient and swift, cost-effectively VOCs and SVOCs contaminated soil are administered outside the venue, can control the soil moisture and keep being substantially constant at the temperature that sets, improve the volatility of its pollutant.Treated soil can be backfilling into former pollued field or use it for anything else.
Description of drawings
Fig. 1 is apparatus of the present invention structural representation.
Fig. 2 is all structural representations of native barrel.
Fig. 3 is a gas pump-drainage well structural representation.
The specific embodiment
The invention provides a kind of volatility and the semi-volatile organic matter contaminated soil is administered technology and device outside the venue.At contaminated soil shown in Figure 1 outside the venue in the controlling device, in the soil tube 13 of the contaminated soil of filling, install by the gas pump-drainage well 1 that is equipped with colored hole, be connected with vacuum meter 3 by wearing wall pipe 19, and connect and compose by pipeline 2 and vavuum pump 8, in the pump drainage air pipe, also be in series with pump drainage gas sampler 4, tail gas charcoal absorption removal device 5, gas flowmeter 6, flow control valve 7; And install by the temperature sensor 9 that inserts contaminated soil in the soil tube 13 of the contaminated soil of filling and is connected with relay 11 by temperature controller 10, heating tape 12 layerings are imbedded in the interior contaminated soil of soil tube 13, and are connected with relay 11.
Its gas releaser is in gas pump-drainage well 1, the gas pipeline 15 that the expanding cement 17 on its top is equipped with peastone 16 and ventilation with the bottom is fixed on central authorities, its top connects cement gauge seal lid 18, and the connection suitable for reading of gas pipeline 15 is worn wall pipe 19 and constituted (as shown in Figure 3).
Described volatility and semi-volatile organic matter contaminated soil are administered technology outside the venue: at first, volatilized property and semi-volatile organic matter contaminated soil are dug out from the scene of polluting, layering then (every layer of about 2cm height) evenly is packed into treating apparatus, guarantee that bulk density everywhere is identical; Restart vavuum pump 8, slow turn-on flow rate control valve 7 makes the reading of gas flowmeter 6 reach the reservation value of pump drainage gas flow, at this moment can read vacuum pressure value the gas pump-drainage well 1 from vacuum meter 3.When vavuum pump is worked, because ambient atmosphere pressure is higher than pressure in the pump-drainage well 1, fresh air constantly enters in the contaminated soil from atmosphere, formed towards the gas flowfield of pump-drainage well direction motion, promote the volatilization of the organic pollution that soil is adsorbed and bring its steam into gas pump-drainage well 1, be transported to tail gas charcoal absorption removal device 5 through gas pipeline 2 again and filter, give off the tail gas that meets atmospheric emission standard at last.From gas sampling device 4, gather the organic pollution steam, can weigh the degree of purification of contaminated soil and whether reach the design governance standard by measuring its concentration.At last, treated soil is backfilling into former pollued field or uses it for anything else.
When more weak, can use the temperature control heating system that contaminated soil is heated as the volatility of pollutant, improve the volatility of its pollutant.Connect heating power supply after starting vavuum pump, the 12 pairs of contaminated soils in heating tape are heated, by the temperature sensor 9 that is embedded in the contaminated soil signal is passed to temperature controller 10 simultaneously, the heating-up temperature of control contaminated soil: when temperature surpasses design temperature, temperature controller commands relays 11 disconnects heating power supply, stops the heating of ribbon heater to soil; When temperature drops to when being lower than design temperature, the temperature controller commands relays is closed heating power supply, heats to soil once more.In this way, this temperature control heating system can be controlled soil moisture maintenance and be substantially constant at the temperature that sets.
Lattice are radius 50cm * high 75cm, and the cover plate of a PVC is arranged on the soil tube 13, and available copper screw and valve rubber combine cover plate with the cylindrical shell sealing.Inside and outside one section of welding on the barrel at tube end 70cm place, all give prominence to 5cm external diameter Φ 20mm wear wall steel pipe 19, be convenient to connect gas pipeline 2.At soil tube 13 walls on week, from apart from the tube end 5cm to 50cm, whenever between the upper and lower every 5cm, between left and right every 10cm, the pore 15 of 10 row Φ 7mm is opened in diamond array, as shown in Figure 2, so that air evenly enters from contaminated soil top and side simultaneously, and weld 120 orders (aperture 0.125mm) steel gauze, prevent that contaminated soil from spilling from eyelet at the eyelet place.The total height of the contaminated soil of inserting in the soil tube 13 is 0.6m, and promptly the contaminated soil cumulative volume of Chu Liing is 0.471m
3, gross weight is 740kg.
Described gas exhaust device: gas pump-drainage well: the gas well (as Fig. 1, shown in Figure 3) of making a bite diameter 6m in soil tube center; Gas pipeline: use the ABS plastic hard tube of external diameter Φ 20mm and the plastic flexible pipe of internal diameter Φ 20mm, the jockey each several part; Vacuum meter: range is-0.1MPa～0Pa; Pump drainage gas sampler: the screw and the supporting nut of a cover ABS plastic customized, screw is Φ 12mm * 45mm, the external diameter of nut is Φ 20mm, and is with flat.The through hole of vertically opening Φ 5mm at screw and nut, the special-purpose sample introduction sealed rubber of the gas-chromatography of Φ 10mm leveled up put into the nut bottom, again with screw precession nut to clamping valve rubber, then nut is coated the ABS plastic special glue, insertion is cemented in the vertical end interface of ABS plastic threeway of Φ 20mm, is sealably coupled to gas pipeline; Tail gas charcoal absorption removal device: the lucite post of an internal diameter Φ 60mm * high 30cm of customization processing is filled with granular activated carbon in the post; Gas flowmeter: model is LZB-15, and range is 0.4～4m
3/ h; Vavuum pump: 2XZ-4 type sliding vane rotary vacuum pump, the speed of exhaust are 41/s, and end vacuum is 6 * 10
-2Pa.
Described temperature control heating device is at stainless steel soil tube 13 outer walls, and to highly twine last 5 heating tapes at interval for 60cm is even, totally 7 circles heat soil tube 13 interior soil from the bottom.In order to prevent that heat that the heating tape produces from being taken away by ambient air and dissipate, simultaneously also for the soil insulation in the soil tube 13, the high temperature resistant and heat insulation asbestic blanket of skin parcel two circles in the heating tape.In the soil of soil tube 13, bury two temperature sensors 9 underground, temperature sensor and temperature controller: model PT100, XMTD-3002, working range 0-99.9 ℃; Relay: model NC3 (CJ46)-09 A.C. contactor, nominal insulation voltage 690V, agreement heating current 16A; The heating tape: wherein the voltage of 4 heating tapes is 220V, and power is 640W, and specification is 50mm * 4000mm, and the power of another heating tape is 960W, and specification is 50mm * 6000mm.
The regulation effect of described contaminated soil is as follows,
Utilize the present invention, handle and contain pentane (C
5H
12) contaminated soil, the initial content of pollutant in soil is 1692mg/kg.Because C
5H
12Volatility is stronger, does not therefore use temperature control heating system heating contaminated soil, and promptly contaminated soil is normal temperature (25 ℃), and regulation effect is fine, sees Table 1.
Table 1 the present invention administers the effect of contaminated soil
| Pollutant | Volatility | The soil moisture (℃) | Processing time (min) | Initial content (ppm) | Handle back content (ppm) | Soil remediation standard (ppm) | Soil removal efficiency (%) |
| C 5H 12 C 8H 18 | A little less than | 25 50 | 660 660 | 1692 247.4 | 3.1 8.7 | 50 50 | 99.8 96.5 |
Annotate: ppm is mg pollutant/kg soil; The relevant criterion that the soil remediation standard is formulated by EPA.
Claims (5)
1. volatility and semi-volatile organic matter contaminated soil controlling device outside the venue, described contaminated soil controlling device outside the venue is to install by the gas pump-drainage well (1) that is equipped with colored hole in the soil tube (13) of the contaminated soil of filling, be connected with vacuum meter (3) by wearing wall pipe (19), and connect and compose by pipeline (2), vavuum pump (8) and tail gas charcoal absorption removal device (5), it is characterized in that: in the pump drainage air pipe, also be in series with pump drainage gas sampler (4), gas flowmeter (6), flow control valve (7); And in the soil tube (13) of the contaminated soil of filling, install and be connected with relay (11) by temperature controller (10) by the temperature sensor (9) that inserts contaminated soil, heating tape (12) layering is imbedded in contaminated soil (14) in the soil tube (13), and and the temperature control heating device that connects to form of relay (11).
2. according to the described volatility of claim 1 and semi-volatile organic matter contaminated soil controlling device outside the venue, it is characterized in that: described gas releaser is in gas pump-drainage well (1), the gas pipeline (20) that the expanding cement on its top (17) is equipped with peastone (16) and ventilation with the bottom is fixed on central authorities, its top connects cement gauge seal lid (18), and the connection suitable for reading of gas pipeline (20) is worn wall pipe (19) and constituted.
3. according to the described volatility of claim 1 and semi-volatile organic matter contaminated soil controlling device outside the venue, it is characterized in that: described contaminated soil layering evenly is packed into every floor height 1.5～3cm for the treatment of apparatus, requires to guarantee that bulk density everywhere is identical.
4. volatility and semi-volatile organic matter contaminated soil are administered method outside the venue, described volatility and semi-volatile organic matter contaminated soil are administered technology outside the venue, at first, volatilized property and semi-volatile organic matter contaminated soil are dug out from the scene of polluting, layering evenly is packed into treating apparatus then, guarantee that bulk density everywhere is identical; Restart vavuum pump (8), slow turn-on flow rate control valve (7), make the reading of gas flowmeter (6) reach the reservation value of pump drainage gas flow, at this moment can read vacuum pressure value the gas pump-drainage well (1) from vacuum meter (3), when vavuum pump is worked, because ambient atmosphere pressure is higher than the interior pressure of pump-drainage well (1), fresh air constantly enters in the contaminated soil from atmosphere, formed towards the gas flowfield of pump-drainage well direction motion, promote the volatilization of the organic pollution that soil is adsorbed and bring its steam into gas pump-drainage well (1), pass through gas pipeline (2) again at organic pollution steam and be transported to tail gas charcoal absorption removal device (5) filtration from gas pump-drainage well (1) pump drainage, it is characterized in that: from gas sampling device (4), gather the organic pollution steam, whether reach the design governance standard by the degree of purification of measuring its concentration measurement contaminated soil, give off the tail gas that meets atmospheric emission standard at last, and treated soil is backfilling into former pollued field or uses it for anything else.
5. administer method outside the venue according to described volatility of claim 4 and semi-volatile organic matter contaminated soil, it is characterized in that: when the volatility of the pollutant of described volatilized property and semi-volatile organic matter contaminated soil is more weak, use the temperature control heating system that contaminated soil is heated, improve the volatility of its pollutant, connect heating power supply after starting vavuum pump, heating tape (12) is heated contaminated soil, by the temperature sensor (9) that is embedded in the contaminated soil signal is passed to temperature controller (10) simultaneously, the heating-up temperature of control contaminated soil remains in 25～75 ℃ the steady temperature scope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410056888 CN1290632C (en) | 2004-08-30 | 2004-08-30 | Kerb treating process and device for volatile and semi-volatile organic substance polluted soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410056888 CN1290632C (en) | 2004-08-30 | 2004-08-30 | Kerb treating process and device for volatile and semi-volatile organic substance polluted soil |
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| Publication Number | Publication Date |
|---|---|
| CN1586747A CN1586747A (en) | 2005-03-02 |
| CN1290632C true CN1290632C (en) | 2006-12-20 |
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| CN 200410056888 Expired - Fee Related CN1290632C (en) | 2004-08-30 | 2004-08-30 | Kerb treating process and device for volatile and semi-volatile organic substance polluted soil |
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| CN111569602B (en) * | 2020-05-13 | 2022-10-04 | 中国船舶工业集团公司第七0八研究所 | Safe and efficient core volatile pollutant removing and purifying device |
| CN111701342B (en) * | 2020-06-18 | 2021-05-04 | 湖南恒凯环保科技投资有限公司 | Underground water organic pollution extraction treatment device and process |
| KR102419797B1 (en) * | 2020-09-23 | 2022-07-13 | 주식회사 지엔에스엔지니어링 | Underground pollutant treatment device using wind energy |
| CN112305086B (en) * | 2020-10-29 | 2023-03-24 | 江苏华东地质环境工程有限公司 | Soil pollutant detection device |
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