CN102671932B - In-situ repair system and method for deep layer stirring-hot air injection of polluted soil - Google Patents
In-situ repair system and method for deep layer stirring-hot air injection of polluted soil Download PDFInfo
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Abstract
The invention provides an in-situ repair system and an in-situ repair method for deep layer stirring-hot air injection of polluted soil. According to the in-situ repair system, the lower end of a hot air spray pipe is communicated with a drill body core pipe in a drill; the upper end of the hot air spray pipe is communicated with an air outlet of a hot air compressor; and a mixed air-liquid pipeline is connected between a coverage cover and an air-liquid separator. According to the method, the drill is drilled in a target soil layer up and down in a reciprocating mode according to designed elevation, wherein the diameter of a stirring drill hole is 1.5 to 2.5 meters, the depth of the stirring drill hole is 9 to 12 meters, the injection pressure of hot air is 1 to 2 MPa, and the temperature of the hot air is 90 to 110 DEG C. According to the technology of the in-situ repair system and the in-situ repair method, the application range of strata can be expanded to low-middle permeable strata, and the range of the types of applicable pollutants is also increased, for example, the technology is still valid to semivolatile organic matters such as anilines. By the in-situ repair system and the in-situ repair method, the problem of 'smearing' of a soil vapor extraction (SVE) technology in the later period of repair can be solved, so that the repair efficiency is improved greatly, and the repair period is shortened greatly.
Description
Technical field
The present invention relates to a kind of original position repair system and method for contaminated soil deep-layer stirring-hot-air injection, belong to contaminated soil remediation system adopting recirculating and restorative procedure technical field.
Background technology
Soil environment is the basis that the mankind depend on for existence, and along with global process of industrialization, organic contamination surpasses heavy metal pollution and radioactive pollution and leaps to the first.In recent years, China's soil pollution is day by day serious, the own ecosystem of spoiled soil not only, directly or indirectly harm humans is healthy, more seriously, volatile organic contaminant can migrate to deep layer in unsaturated zone, especially underground water resource is constituted a threat to, cause serious consequence, therefore be badly in need of the Engineering Remediation Techniques that research and development tally with the national condition.Because complexity, the particularity of volatile organic matter, the pollutant in soil skewness of contaminated site geological conditions, single soil remediation technology often can not reach the reparation target of expection, and it is particularly urgent that the demand of contaminated soil combined remediation technology seems.
The soil remediation engineering can be divided into original position reparation and showering by its embodiment, can be divided into physics reparation, chemistry reparation and biological restoration by its restorative procedure.
Soil vapor extraction (Soil Vapor Extraction, SVE), it is a kind of soil in-situ recovery technique that starts from the middle and later periods eighties 20th century, its principle is mainly to utilize physical method to remove volatile organic matter (Volatile Organic Compounds, VOCs) in the porous media soil in underground unsaturated zone (vadose).The Restricted requirements such as the contaminated thing characteristic of the field of SVE recovery technique, soil characteristic and subterranean microorganisms situation.General SVE system comprises the basic structures such as extraction well, vavuum pump, ground pipeline, exhaust gas processing device usually.
The application of soil vapor extraction technology has its scope of application: the SVE technology is suitable for the removal reparation of volatile organic contaminant in the unsaturated zone of soil, and the penetration property of soil, the vapour pressure of pollutant have material impact to repairing effect.The soil vapor extraction technology has been widely used in actual repair in developed country, but its repair theory also need be further perfect, and the design of SVE system still largely depends on field trial or pilot scale data.
The deep subsoil stirring technique is a kind of technology of reinforcing soft ground, to utilize deep-layer stirring machinery (such as the stay bolt rig), in reinforcement depth, on the spot weak soil and cement are forced mix, weak soil is hardened into have a kind of method for processing foundation of the soil cement of globality, water stability and sufficient intensity.This technology is that Japan is pioneering and begin to use at the mid-1970s, is called for short the CMC engineering method.The domestic cooperation by Water Planning And Design Institute Of Traffic Ministry and metallurgical construction research institute the year ends 1977 carried out machinery development and indoor and outdoor test, and the formal use of beginning in Geotechnical Engineering.
The hot-air injection technique has hot-air and injects relatively economical, the advantage that easily provides with respect to high quality steam.Because air has relatively low thermal capacity and in ducted high energy loss, it not is very effective mode to the underground transferring heat that single hot-air injects.
U.S. Patent No. 6,805,518 " volatile organic matter original position soil restorative procedures " have been mentioned in situ chemical oxidation improvement contaminated soil and have in earlier stage been carried out stripping, it collects volatile hydrocarbon in the soil by groove device, be actually the chemical oxidation method that a kind of heat is strengthened, the purpose that the method is introduced hot-air is the pre-treatment of chemical oxidation, and its application has certain limitation, only is suitable for the reparation of the hydrocarbons pollutant of easy oxidation.
U.S. Patent No. 5,836,718 " contaminated soil heterotopic clean method and devices " adopt sealing mound system, supply with by fuel and produce hot-air, form the hot air circulate loop with the processing hydrocarbons contaminated soil.The method adopts pipeline liquid injecting device to conduct heat and direct-fired mode, and factor restricts because mound internal contamination thing skewness, soil porosity differ greatly etc., can cause airflow obstruction, energy consumption is relatively large and treatment effect is not good.
U.S. Patent No. 5,639,182 " soil in-situ restorative procedures " relate to a kind of original position soil stirring means, and it is equipped with the impeller drill bit that can vertically creep into by the rig that portable crawler belt is advanced, and can realize that the original position of contaminated soil stirs.Adopt that to stir drill bit be integral type impeller drill bit, thereby stir that the degree of depth is restricted and resistance is larger, its application has certain limitation, only is suitable for the processing than scall.
Above several patented technology is used for the contaminated soil original position and repairs or showering, method and device that the introducing mode of its hot-air and device, soil stir, use the restriction that largely is subject to the factors such as on-the-spot site condition, pollutant kind, so that the scope of application of this type of technology, application cost, control and remediation efficiency etc. still have many parts of waiting to improve and strengthen, especially hot-air injection technique, soil stirring technique and combinatorial problem thereof.
Summary of the invention
The objective of the invention is for the remediation efficiency that solves existing original position system and the removal of pollutants effect is relatively poor, the SVE technology is in the problem of repairing the later stage ubiquitous " smearing ", and then a kind of original position repair system and method for injecting for contaminated soil deep-layer stirring-hot-air is provided.
The objective of the invention is to be achieved through the following technical solutions:
A kind of original position repair system for contaminated soil deep-layer stirring-hot-air injection, comprise: long-spiral drilling machine, unit head, the hot-air playpipe, drilling rod, bit body core pipe, drill bit, cover, the gas-liquid mixture pipeline, gas-liquid separator, the hot-air compressor, the whirlpool air exhauster, the gas phase treatment device, the liquid phase transfer pipeline, waste liquid processor and power source, described unit head is arranged on the long-spiral drilling machine, the upper end of drilling rod is connected with unit head, the lower end of drilling rod is connected with drill bit, the hot-air playpipe is arranged in the drilling rod, bit body core pipe in the lower end of hot-air playpipe and the drill bit is connected, have the hot-air jet on the bit body core pipe, the upper end of hot-air playpipe is connected with the gas outlet of hot-air compressor, power source is connected with the gas phase treatment device with the hot-air compressor respectively, cover is arranged on the top of drill bit, be connected with the gas-liquid mixture pipeline between cover and the gas-liquid separator, be connected with the liquid phase transfer pipeline between the liquid-phase outlet of gas-liquid separator and the waste liquid processor, waste liquid processor is provided with waste liquid outlet up to standard, the air inlet of whirlpool air exhauster is connected with the gaseous phase outlet of gas-liquid separator, and the air outlet of whirlpool air exhauster is connected with the exhaust gas inlet of gas phase treatment device.
A kind of in-situ remediation method for contaminated soil deep-layer stirring-hot-air injection, at first, according to designed elevation, drill bit up and down reciprocatingly creeps in the target soil horizon, the contaminated soil of differing texture, different density degree is broken up mixing, increase voidage and the sponginess of soil, the high-pressure hot air that is provided by the hot-air compressor is delivered in the stirring boring, hot-air jet ejection from the drill bit bottom, also heat soil in the time of pollutant in the stripping soil, accelerate to be adsorbed on desorb, volatilization and the diffusion of the pollutant in the soil; At last, process via gas-liquid separator, gas phase treatment device and waste liquid processor from the organic pollutant that stirs the boring collection, the diameter of described stirring boring is 1.5～2.5 meters, the degree of depth that stirs boring is 9～12 meters, the hot-air injection pressure is 1～2MPa, and hot air temperature is 90～110 ℃.
The invention has the beneficial effects as follows:
One, the repair system design is relatively simple, is superior to other such as the design of the Technology Need complexity such as biological treatment or soil flushing or special equipment.Can reach best remediation efficiency and the removal of pollutants effect of original position system.
Two, have feasibility for contaminated site soil situ flow mechanics test and the reparation of volatile organic matter original position, its vertical shaft vertically stirs hole-drilling system and is adapted to on-the-spot stratum and edaphic condition such as different geological conditions such as sand, silt, silty clay, argillic horizons.The present invention has adopted the mode of injecting hot-air, compares with steam injection technique, and energy consumption reduces greatly.
Three, the present invention is with respect to soil vapor extraction (SVE) technology, and its range of application has greatly obtained expansion.During tradition SVE technology is only applicable to～high permeability formation and pollutant in soil are volatile organic compound, and technology application of the present invention stratum scope can expand to low～middle permeable formation, the type scope of applicable pollutant also increases to some extent, as still effective for some semi-volatile organic matters such as aniline.Can solve the SVE technology repairing later stage ubiquitous " smearing " problem, remediation efficiency is improved greatly, greatly shorten repairing efficiency.
Four, deep-layer stirring of the present invention has adopted and has stirred again technique, is divided into rough drill and bores again two processes, can guarantee to mix the abundant stripping of volatile contaminant in the rear soil.The rough drill purpose is to loosen, the soil of mixing restoring area, and cooperates the PID reading tentatively to judge the restoring area pollution level, for multiple brill operation and vent gas treatment provide foundation.Bore again purpose and be efficiently, at utmost to remove volatile contaminant in the soil.
Contaminated soil deep-layer stirring of the present invention-hot-air injected system, its ground gas phase is collected and treatment system, and hot-air injection device and pipeline portions thereof and underground stirring boring part organically combine the organic polluted soil original position that has consisted of desirable, the efficient field pilot test of volatility organic polluted soil or commercial Application scale and repair system.Comparing needs other recovery technique of complex device such as Soil leaching, biological restoration, chemical oxidation reparation, can reach the target of expected test or reparation with the equipment investment that drops into less.Field pilot-scale proves, the present invention be have reasonable in design, equipment relatively simple, easy to operate feasible, be easy to safeguard, the running parameter holds manageable organic polluted soil original position and repairs system, have broad application prospects.
Description of drawings
Fig. 1 is the structural representation of a kind of original position repair system that injects for contaminated soil deep-layer stirring-hot-air of the present invention;
Fig. 2 is the A place enlarged drawing of Fig. 1.
The specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing: the present embodiment is implemented under take technical solution of the present invention as prerequisite, has provided detailed embodiment, but protection scope of the present invention is not limited to following embodiment.
As depicted in figs. 1 and 2, a kind of original position repair system for contaminated soil deep-layer stirring-hot-air injection that the present embodiment is related, comprise: long-spiral drilling machine 1, unit head 2, hot-air playpipe 3, drilling rod 4, bit body core pipe 7, drill bit 8, cover 13, gas-liquid mixture pipeline 15, gas-liquid separator 16, hot-air compressor 18, whirlpool air exhauster 23, gas phase treatment device 25, liquid phase transfer pipeline 28, waste liquid processor 29 and power source 31, described unit head 2 is arranged on the long-spiral drilling machine 1, the upper end of drilling rod 4 is connected with unit head 2, the lower end of drilling rod 4 is connected with drill bit 8, hot-air playpipe 3 is arranged in the drilling rod 4, bit body core pipe 7 in the lower end of hot-air playpipe 3 and the drill bit 8 is connected, have hot-air jet 6 on the bit body core pipe 7, the upper end of hot-air playpipe 3 is connected with the gas outlet of hot-air compressor 18, power source 31 is connected with gas phase treatment device 25 with hot-air compressor 18 respectively, cover 13 is arranged on the top of drill bit 8, be connected with gas-liquid mixture pipeline 15 between cover 13 and the gas-liquid separator 16, be connected with liquid phase transfer pipeline 28 between the liquid-phase outlet of gas-liquid separator 16 and the waste liquid processor 29, waste liquid processor 29 is provided with waste liquid outlet 32 up to standard, the air inlet of whirlpool air exhauster 23 is connected with the gaseous phase outlet of gas-liquid separator 16, and the air outlet of whirlpool air exhauster 23 is connected with the exhaust gas inlet 24 of gas phase treatment device 25.
Gas-liquid mixture pipeline 15 in described gas-liquid separator 16 porch is provided with gas-liquid separator inlet temperature pressure-measuring-point 14.
Be provided with hot-air compressor exit temperature pressure-measuring-point 17 in the exit of described hot-air compressor 18.
Be provided with whirlpool air exhauster outlet pressure measuring point 22 in the exit of described whirlpool air exhauster 23.
The length of described drilling rod 4 is 9～12m, and diameter is 250～350mm.
A kind of in-situ remediation method for contaminated soil deep-layer stirring-hot-air injection, at first, according to designed elevation, drill bit 8 up and down reciprocatingly creeps in target soil horizon 9, the contaminated soil of differing texture, different density degree is broken up mixing, increase voidage and the sponginess of soil, the high-pressure hot air that is provided by hot-air compressor 18 is delivered in the stirring boring 11, hot-air jet 6 ejections from drill bit 8 bottoms, also heat soil in the time of pollutant in the stripping soil, accelerate to be adsorbed on desorb, volatilization and the diffusion of the pollutant in the soil; At last, process via gas-liquid separator 16, gas phase treatment device 25 and waste liquid processor 29 from the organic pollutant 12 that stirs boring 11 collections, the diameter of described stirring boring 11 is 1.5～2.5 meters, the degree of depth that stirs boring 11 is 9～12 meters, the hot-air injection pressure is 1～2MPa, and hot air temperature is 90～110 ℃.
Soil of the present invention stirs and the hot-air injection technology, can adopt intermittently operated or continued operation.
The above; only be the better specific embodiment of the present invention; these specific embodiment all are based on the different implementations under the general idea of the present invention; and protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (7)
1. one kind is used for the original position repair system that contaminated soil deep-layer stirring-hot-air injects, comprise: long-spiral drilling machine, unit head, the hot-air playpipe, drilling rod, bit body core pipe, drill bit, cover, the gas-liquid mixture pipeline, gas-liquid separator, the hot-air compressor, the whirlpool air exhauster, the gas phase treatment device, the liquid phase transfer pipeline, waste liquid processor and power source, it is characterized in that, described unit head is arranged on the long-spiral drilling machine, the upper end of drilling rod is connected with unit head, the lower end of drilling rod is connected with drill bit, the hot-air playpipe is arranged in the drilling rod, bit body core pipe in the lower end of hot-air playpipe and the drill bit is connected, have the hot-air jet on the bit body core pipe, the upper end of hot-air playpipe is connected with the gas outlet of hot-air compressor, power source is connected with the gas phase treatment device with the hot-air compressor respectively, cover is arranged on the top of drill bit, be connected with the gas-liquid mixture pipeline between cover and the gas-liquid separator, be connected with the liquid phase transfer pipeline between the liquid-phase outlet of gas-liquid separator and the waste liquid processor, waste liquid processor is provided with waste liquid outlet up to standard, the air inlet of whirlpool air exhauster is connected with the gaseous phase outlet of gas-liquid separator, and the air outlet of whirlpool air exhauster is connected with the exhaust gas inlet of gas phase treatment device.
2. the original position repair system for contaminated soil deep-layer stirring-hot-air injection according to claim 1 is characterized in that, the gas-liquid mixture pipeline in described gas-liquid separator porch is provided with gas-liquid separator inlet temperature pressure-measuring-point.
3. the original position repair system for contaminated soil deep-layer stirring-hot-air injection according to claim 1 is characterized in that, is provided with hot-air compressor exit temperature pressure-measuring-point in the exit of described hot-air compressor.
4. the original position repair system for contaminated soil deep-layer stirring-hot-air injection according to claim 1 is characterized in that, is provided with whirlpool air exhauster outlet pressure measuring point in the exit of described whirlpool air exhauster.
5. the original position repair system for contaminated soil deep-layer stirring-hot-air injection according to claim 1 is characterized in that, the length of described drilling rod is 9～12m, and diameter is 250～350mm.
6. one kind is used for the in-situ remediation method that contaminated soil deep-layer stirring-hot-air injects, it is characterized in that, at first, according to designed elevation, drill bit up and down reciprocatingly creeps in the target soil horizon, the contaminated soil of differing texture, different density degree is broken up mixing, increase voidage and the sponginess of soil, the high-pressure hot air that is provided by the hot-air compressor is delivered in the stirring boring, hot-air jet ejection from the drill bit bottom, also heat soil in the time of pollutant in the stripping soil, accelerate to be adsorbed on desorb, volatilization and the diffusion of the pollutant in the soil; At last, process via gas-liquid separator, gas phase treatment device and waste liquid processor from the organic pollutant that stirs the boring collection, the diameter of described stirring boring is 1.5～2.5 meters, the degree of depth that stirs boring is 9～12 meters, the hot-air injection pressure is 1～2MPa, and hot air temperature is 90～110 ℃.
7. the in-situ remediation method for contaminated soil deep-layer stirring-hot-air injection according to claim 1 is characterized in that, soil stirs with hot-air and injects, and adopts intermittently operated or continued operation.
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| AU658297B2 (en) * | 1992-06-22 | 1995-04-06 | Successful Ventures Enterprises Inc. | Method for treating soil contaminated with hydrocarbons |
| US6413017B2 (en) * | 2000-03-14 | 2002-07-02 | Jonathan B. Scott | Conversion of hydrocarbon-contaminated particulate soil and/or rock to fertile soil useful in erosion control |
| US6632047B2 (en) * | 2000-04-14 | 2003-10-14 | Board Of Regents, The University Of Texas System | Heater element for use in an in situ thermal desorption soil remediation system |
| CN1290632C (en) * | 2004-08-30 | 2006-12-20 | 清华大学 | Kerb treating process and device for volatile and semi-volatile organic substance polluted soil |
| KR100850165B1 (en) * | 2007-04-23 | 2008-08-04 | (주)대우건설 | Apparatus and method for remediation of contaminated soil and groundwater by electric resistance heating combined with the injection of oxidizing agents |
| CN202438537U (en) * | 2012-02-17 | 2012-09-19 | 北京建工环境修复有限责任公司 | In-situ remediation device for deep stirring-hot air injection of polluted soil |
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| CN109108064A (en) * | 2018-08-10 | 2019-01-01 | 安徽与时环保工程技术有限公司 | A kind of heavy caliber lath drill-bit type in-situ remediation system |
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