CN103230933B - A device for remediation of organic contaminated soil by using thermal desorption combined with an oxidant and a remediation method - Google Patents

A device for remediation of organic contaminated soil by using thermal desorption combined with an oxidant and a remediation method Download PDF

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CN103230933B
CN103230933B CN201310124490.1A CN201310124490A CN103230933B CN 103230933 B CN103230933 B CN 103230933B CN 201310124490 A CN201310124490 A CN 201310124490A CN 103230933 B CN103230933 B CN 103230933B
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soil
air
heat
thermal desorption
oxidant
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CN103230933A (en
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卢宏玮
史斌
任丽霞
杜鹏
何理
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North China Electric Power University
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North China Electric Power University
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Abstract

The invention belongs to the technical field of environmental protection, and in particular relates to a device for remediation of organic contaminated soil by using thermal desorption combined with an oxidant and a remediation method. The device of the invention is composed of an air heater, an air compressor, an air valve, a dosing valve, a dosing tank, a vacuum suction pump, a delivery pump, an electric power control unit, an insulation layer, lateral pipes, injection syringes, injection wells, a gas collection well and vacuum suction pipelines. According to the invention, through a treatment method of in situ thermal desorption and adding the oxidant, volatile organic compound contaminated soil is effectively treated. The technique of the invention is applicable to a relatively broad scope, can be used to perform in situ pollution remediation of volatile organic compounds under different climatic conditions, geological conditions, soil properties, and earth surface conditions. The heater of the present invention can infuse more produced heat into the soil, thus saving fuel and combustion time.

Description

The device of thermal desorption co-oxidation agent repairing organic polluted soil and restorative procedure
Technical field
The invention belongs to environmental protection technical field, particularly a kind of device of thermal desorption co-oxidation agent repairing organic polluted soil and restorative procedure.
Background technology
Since reform and opening-up, develop rapidly along with China is industrialized, city size expands gradually, thus makes urbanization process achieve unprecedented development.In the process that city is constantly expanded to the periphery, be originally in periphery in a large number and exist pollute industrial enterprise also become a part for urban central zone gradually; And the population of urban central zone often high concentration, these industrial enterprises that there is pollution risk cause great threat to health and Environmental security.In order to adapt to the requirement improving city environmental quality, Optimizing City functional structure, the policy of " move back two and enter three " has been carried out in the transformation of China to urban central zone.Thus, since the nineties in 20th century, first there is the phenomenon of large-scale industry enterprises remove in the more flourishing city of China.
Because a large amount of contaminated sites has been left in contaminating enterprises' resettlement, the environmental pollution accident caused after resettlement and the hazardous events to health happen occasionally.In addition, due to the development of petroleum industry, the contamination accident that volatility (VOCs) organic pollutions such as the gasoline caused, diesel oil bring.As oil pipeline breaks, oil storage tank seepage, the soil environment problem that gas station's resettlement etc. cause.
According to the detection to the current most of organic polluted soil of China, wherein major pollutants have total petroleum hydrocarbon class, and content can reach 1786 ~ 40167 mg/kg; Polycyclic aromatic hydrocarbon, content reaches 26.10 mg/kg, exceedes GB " standard of soil environment quality " third level standard value.
In the past few decades, by the restriction of the many factors such as period of history economic technology condition and people's level of understanding, oil play, while making major contribution for country, also brings a series of environmental problem: the pollutants such as the waste water in oil-gas mining process, waste gas, ground crude oil, waste gas drilling fluid enter environment and can impact water body, air, soil and ecological environment.Along with the extensive use of petroleum resources, the oil pollution in environment is more and more serious.In Petroleum Production, storing, refining processing and use procedure, also have spilling and the discharge of petroleum hydrocarbon, cause the oil pollution that oil field and petrochemical factory's surrounding water and soil are serious.In the world today, the total output of oil about has 2,200,000,000 t every year, and wherein 17.5 hundred million t are by land field produces.The whole world has 8,000,000 t entered environments every year, and China has nearly 600,000 t entered environments every year, contaminated soil, underground water, river and ocean, annual new pollution soil 1 × 10 5t.
Up to the present, be showering and in-situ immobilization by petroleum hydrocarbons contaminated soil and underground moisture.Showering contaminated soil and underground water is transferred to more than ground process, and comprises in-situ processing, composting process, pyrolysis processing, Soil leaching, bioreactor etc.In-situ immobilization refers to that contaminated soil underground water processes in position, is not substantially comprised Soil leaching, biology in situ reparation and in-situ chemical reparation etc. by stirring during process.In-situ immobilization because of its expense relatively low, the advantages such as, secondary pollution little to environmental perturbation is little become the research and practice main flow of soil restoring technology.
What the present invention adopted is the technology of novel thermal desorption process and chemical oxidizing agent Combined Treatment contaminated soil.Thermal desorption treatment technology, generally refers to by direct or indirect heat exchange, by the organic pollution decompose themselves in contaminated soil, evaporation, oxidation, and is separated with contaminated soil.Chemical oxidizing agent process is adopted to the incomplete pollutant of thermal desorption process.Having at present much uses strong oxidizer (as ozone, hydrogen peroxide and permanganate) to process the method (as surface treatment, seepage flow, filtration, desorption) of the soil and groundwater of Organic Pollution.Wherein, permanganate is the organic strong oxidizer of a kind of process, and the organic matter that can process comprises: ethylbenzene, toluene, dimethylbenzene, carrene, 1,2-dichloroethanes, 1,1,1-trichloroethanes, carbon tetrachloride, chloroform, chlorobenzene, ethylene dibromide, tertbutyl ether, tetrachloro-ethylene, trichloro-ethylene, dichloroethylene, vinyl chloride etc.
Repair in high-enriched organics contaminated soil process in position, in order to the scope making organic concentration reach safe, if directly use permanganate to be oxidized, a large amount of manganese dioxide precipitate can be generated.Although in general, manganese dioxide is a kind of naturally occurring harmless mineral matter.But in the soil containing a large amount of organic pollution, the amount of the permanganate oxidant needed for organics removal is very large, the amount of the manganese dioxide produced after reaction will exceed safe concentration, so generally directly can not use permanganate reparation.
Summary of the invention
Not enough for prior art, the invention provides a kind of device and restorative procedure of thermal desorption co-oxidation agent repairing organic polluted soil.
A device for thermal desorption co-oxidation agent repairing organic polluted soil, arranges heat-insulation layer, in order to prevent heat loss on earth's surface, contaminated soil region; Few 1 injector well and at least 1 gas collection well is respectively provided in contaminated soil region below heat-insulation layer; The degree of depth of described injector well, all through Polluted area 1 ~ 2 m, reaches unpolluted soil; Each the penetrating on the well borehole wall of described note all arranges multiple horizontal pipeline, in order to increase its operating radius; Arrange at least 1 syringe in described injector well, described each syringe is all connected with air compressor by air door, and described each syringe is all connected with dosing tank by dosing valve; Described air compressor is connected with air heater, and air heater, air compressor and Vacuum suction pump are connected with electric power control device respectively; Described Vacuum suction pump is connected with at least 1 vacuum draw pipeline with delivery pump respectively, and the lower end mouth of pipe of described every bar vacuum draw pipeline is all arranged in gas collection well.
The material of described heat-insulation layer is PCB aluminium base.
Described heat-insulation layer is directly weldingly connected with each injector well and each gas collection well respectively, realizes seamless link.
A restorative procedure for the device of thermal desorption co-oxidation agent repairing organic polluted soil, its concrete steps are as follows:
(1) site investigation is carried out to pending contaminated site, obtain area, the hydrogeologic condition of contaminated site, pollutant kind, physicochemical properties data, thus determine pollution condition;
(2) above the Polluted area determined, at least a bite injector well is set up; Open air heater and air compressor, open air door, removed the hydrocarbon existed in the volatile organic matter of soil middle and high concentration and soil by continuous print injection HTHP air; By injection HTHP air, shake loose closely knit soil texture, increase soil porosity, HTHP air sprays from the nozzle of injector tip; Continuous use hot-air carries out desorption, monitors organic situation of change in soil at any time, when the organic concentration in soil no longer obviously reduces, closes air door, stops thermal desorption process;
(3) open dosing valve, add permanganate oxidant by dosing tank, oxidant is mixed in soil; Process the incomplete organic pollution materials of above-mentioned thermal desorption, different according to the concentration of the pollutant monitored, select the oxidant adding appropriate amount; The pollutant that further removal remains makes its concentration be reduced to target level;
(4) after adding oxidant 2 ~ 3 h, bring into operation gas collection well, and open Vacuum suction pump, gas pollutant moves to gas collection well direction under suction function, is sucked into earth's surface, and sends external process devices to through delivery pump via gas collection well;
(5) in order to avoid the gas exchanges between the loss and soil atmosphere of heat, above Polluted area, heat-insulation layer is provided with; Be connected with the direct of air in order to cut off whole Polluted area, form a semi-enclosed system, reduce the loss of heat.
Institute uses the mole of permanganate identical with the mole of the pollutant that needs are oxidized in described step (3).
When the regional depth that will heat is not less than 5 m, its surface temperature with when heating region surface temperature difference is not more than 5 DEG C, does not then install heat-insulation layer, to save cost.
Beneficial effect of the present invention is:
This technology scope of application is relatively wider, can carry out the pollution amelioration of the volatile organic contaminant of original position under different geological conditions, soil property and surface conditions.And this method is also applicable at arctic weather, before being introduced by permanganate, preheating is carried out to soil, especially in the clay that water content is higher.Originally thermal desorption process does not need preheating, because the hot-air of injection can produce the heat of local.Then, introduce permanganate, the soil be heated can be helpful to this process, and especially when soil is caught a cold, preheating can melt the soil solidified, and reduces the moisture of soil, improves the temperature of soil, and then accelerate the speed of oxidation.Floor heating system can to soil preheating, and this equipment has insulating barrier and a vapour hood, and heat dissipation can be stoped like this in air.Compared with previous firing equipment, the more heats produced can be injected in soil by this firing equipment, and which save fuel and burning time, this quadrat method is confirmed in actual experiment.
Accompanying drawing explanation
Fig. 1 is apparatus of the present invention structural representation;
Number in the figure: 1-air heater, 2-air compressor, 3-air door, 4-dosing valve, 5-dosing tank, 6-Vacuum suction pump, 7-delivery pump, 8-electric power control device, 9-heat-insulation layer, 10-horizontal pipeline, 11-syringe, 12-injector well, 13-gas collection well, 14-vacuum draw pipeline.
Detailed description of the invention
The invention provides a kind of device and restorative procedure of thermal desorption co-oxidation agent repairing organic polluted soil, below in conjunction with the drawings and specific embodiments, the present invention will be further described.
A device for thermal desorption co-oxidation agent repairing organic polluted soil, arranges heat-insulation layer 9, in order to prevent heat loss on earth's surface, contaminated soil region; Few 1 injector well 12 and at least 1 gas collection well 13 is respectively provided in contaminated soil region below heat-insulation layer 9; The degree of depth of described injector well 12, all through Polluted area 1 ~ 2 m, reaches unpolluted soil; Each the penetrating on well 12 borehole wall of described note all arranges multiple horizontal pipeline 10, in order to increase its operating radius; Arrange at least 1 syringe 11 in described injector well 12, described each syringe 11 is all connected with air compressor 2 by air door 3, and described each syringe 11 is all connected with dosing tank 5 by dosing valve 4; Described air compressor 2 is connected with air heater 1, and air heater 1, air compressor 2 are connected with electric power control device 8 respectively with Vacuum suction pump 6; Described Vacuum suction pump 6 is connected with at least 1 vacuum draw pipeline 14 with delivery pump 7 respectively, and the lower end mouth of pipe of described every bar vacuum draw pipeline 14 is all arranged in gas collection well 13.
The material of described heat-insulation layer 9 is PCB aluminium base.
Described heat-insulation layer 9 is directly weldingly connected with each injector well 12 and each gas collection well 13 respectively, realizes seamless link.
A restorative procedure for the device of thermal desorption co-oxidation agent repairing organic polluted soil, its concrete steps are as follows:
(1) site investigation is carried out to pending contaminated site, obtain area, the hydrogeologic condition of contaminated site, pollutant kind, physicochemical properties data, thus determine pollution condition;
(2) above the Polluted area determined, at least a bite injector well 11 is set up; Open air heater 1 and air compressor 2, open air door 3, removed the hydrocarbon existed in the volatile organic matter of soil middle and high concentration and soil by continuous print injection HTHP air; By injection HTHP air, shake loose closely knit soil texture, increase soil porosity, HTHP air sprays from the nozzle of injector tip; Continuous use hot-air carries out desorption, monitors organic situation of change in soil at any time, when the organic concentration in soil no longer obviously reduces, closes air door 3, stops thermal desorption process;
(3) open dosing valve 4, add permanganate oxidant by dosing tank 5, oxidant is mixed in soil; Process the incomplete organic pollution materials of above-mentioned thermal desorption, different according to the concentration of the pollutant monitored, select the oxidant adding appropriate amount; The pollutant that further removal remains makes its concentration be reduced to target level;
(4) after adding oxidant 2 ~ 3 h, bring into operation gas collection well 13, and open Vacuum suction pump 6, gas pollutant moves to gas collection well 13 direction under suction function, be sucked into earth's surface via gas collection well 13, and send external process devices to through delivery pump 7;
(5) in order to avoid the gas exchanges between the loss and soil atmosphere of heat, above Polluted area, heat-insulation layer 9 is provided with; Be connected with the direct of air in order to cut off whole Polluted area, form a semi-enclosed system, reduce the loss of heat.
Institute uses the mole of permanganate identical with the mole of the pollutant that needs are oxidized in described step (3).
When the regional depth that will heat is not less than 5 m, its surface temperature with when heating region surface temperature difference is not more than 5 DEG C, does not then install heat-insulation layer 9, to save cost.
Embodiment 1
The method is utilized to carry out the in-situ immobilization experimental study of tetrachloro-ethylene:
The soil in the plot of experimental study is clay soil, carries out the research of original position pollution amelioration in this way, and the target of thermal desorption is that the concentration of the tetrachloro-ethylene made in soil is reduced to 20 below ppm.Originally, by injector well by HTHP air sparging in soil.Before use thermal desorption method, tce concentration in soil is 25000 ppm, when continuous injection hot-air through after a while makes the concentration of the tetrachloro-ethylene of soil be reduced to 120 ppm, continue its concentration of thermal desorption and no longer reduce, then stop thermal desorption.Although this one-phase can remove a large amount of tetrachloro-ethylenes, the concentration of residual tetrachloro-ethylene has still exceeded the concentration drafted.
First stage carries out under the condition of cold, and mean temperature is near or below zero degrees celsius.Add in the process of hot-air, the soil moisture raises, and substantially maintains about 90 DEG C, adds potassium permanganate subsequently at pilot region.
And stir with soil vibrating head.By sample determination, the concentration of tetrachloro-ethylene is reduced to 68 ppm after 24 h, and the concentration after 48 h is reduced to 38 ppm, and end product shows to produce a desired effect.

Claims (2)

1. a device for thermal desorption co-oxidation agent repairing organic polluted soil, is characterized in that: arrange heat-insulation layer (9), in order to prevent heat loss on earth's surface, contaminated soil region; Few 1 injector well (12) and at least 1 gas collection well (13) is respectively provided in the contaminated soil region of heat-insulation layer (9) below; The degree of depth of described injector well (12), all through Polluted area 1 ~ 2m, reaches unpolluted soil; Described each injector well (12) borehole wall all arranges multiple horizontal pipeline (10), in order to increase its operating radius; In described injector well (12), at least 1 syringe (11) is set, described each syringe (11) is all connected with air compressor (2) by air door (3), and described each syringe (11) is all connected with dosing tank (5) by dosing valve (4); Described air compressor (2) is connected with air heater (1), and air heater (1), air compressor (2) are connected with electric power control device (8) respectively with Vacuum suction pump (6); Described Vacuum suction pump (6) is connected with at least 1 vacuum draw pipeline (14) with delivery pump (7) respectively, and the lower end mouth of pipe of described every bar vacuum draw pipeline (14) is all arranged in gas collection well (13);
The material of described heat-insulation layer (9) is PCB aluminium base;
Described heat-insulation layer (9) is directly weldingly connected with each injector well (12) and each gas collection well (13) respectively, realizes seamless link.
2. use a restorative procedure for the device of thermal desorption co-oxidation agent repairing organic polluted soil as claimed in claim 1, it is characterized in that, concrete steps are as follows:
(1) site investigation is carried out to pending contaminated site, obtain area, the hydrogeologic condition of contaminated site, pollutant kind, physicochemical properties data, thus determine pollution condition;
(2) above the Polluted area determined, at least a bite injector well is set up; Open air heater and air compressor, open air door, removed the hydrocarbon existed in the volatile organic matter of soil middle and high concentration and soil by continuous print injection HTHP air; By injection HTHP air, shake loose closely knit soil texture, increase soil porosity, HTHP air sprays from the nozzle of injector tip; Continuous use hot-air carries out desorption, monitors organic situation of change in soil at any time, when the organic concentration in soil no longer obviously reduces, closes air door, stops thermal desorption process;
(3) open dosing valve, add permanganate oxidant by dosing tank, oxidant is mixed in soil; Process the incomplete organic pollution materials of above-mentioned thermal desorption, different according to the concentration of the pollutant monitored, select the oxidant adding appropriate amount; The pollutant that further removal remains makes its concentration be reduced to target level;
(4) after adding oxidant 2 ~ 3h, bring into operation gas collection well, opens Vacuum suction pump, and gas pollutant moves to collection well direction under suction function, is sucked into earth's surface, and sends external process devices to through delivery pump via gas collection well;
(5) in order to avoid the gas exchanges between the loss and soil atmosphere of heat, above Polluted area, heat-insulation layer is provided with; Be connected with the direct of air in order to cut off whole Polluted area, form a semi-enclosed system, reduce the loss of heat;
Institute uses the mole of permanganate identical with the mole of the pollutant that needs are oxidized in described step (3);
When the regional depth that will heat is not less than 5m, its surface temperature with when heating region surface temperature difference is not more than 5 DEG C, does not then install heat-insulation layer, to save cost.
CN201310124490.1A 2013-04-11 2013-04-11 A device for remediation of organic contaminated soil by using thermal desorption combined with an oxidant and a remediation method Active CN103230933B (en)

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