CN112845561A - Thermal ventilation reinforced petroleum hydrocarbon contaminated soil in-situ remediation method - Google Patents
Thermal ventilation reinforced petroleum hydrocarbon contaminated soil in-situ remediation method Download PDFInfo
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- CN112845561A CN112845561A CN201911182815.5A CN201911182815A CN112845561A CN 112845561 A CN112845561 A CN 112845561A CN 201911182815 A CN201911182815 A CN 201911182815A CN 112845561 A CN112845561 A CN 112845561A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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Abstract
The invention discloses a method for strengthening in-situ remediation of petroleum hydrocarbon contaminated soil by thermal ventilation, which comprises the following steps: s1, determining the pollution range and the concentration distribution of pollutants in a polluted site, and laying an extraction well and an injection well; s2, performing gas phase extraction and remediation of the soil through a vacuum extraction system, and performing underground water aeration and low-temperature thermal desorption and in-situ remediation of the soil through a blast injection system; s3, repeating the step S2 until the concentration of the pollutants in the polluted site is reduced to 0.45% -5% of the original concentration of the pollutants, and completing the in-situ remediation of the polluted soil. The method for in-situ remediation of the petroleum hydrocarbon contaminated soil through thermal ventilation strengthening provided by the invention achieves the removal of volatile and semi-volatile organic compounds in soil and underground water in a mode of multiple alternate operation of SVE, AS and a hot air injection system; the in-situ remediation technology has small field disturbance and small influence on the ground, and the whole process has no secondary pollution.
Description
Technical Field
The invention relates to the technical field of soil in-situ remediation. More particularly, relates to a method for strengthening in-situ remediation of petroleum hydrocarbon contaminated soil by hot ventilation.
Background
The accidents of soil and underground water pollution caused by the leakage of gas stations and finished oil depots are frequent. In 1995, 78 tons of diesel oil leaked from a gas station of an Anjia building in Beijing leaked into soil and underground water within one week, so that a nearby water plant is forced to stop production, and the water supply range is influenced to 36 kilometers; in 2006, a large amount of leakage occurs in the Jiangsu Nanjing Panlong refueling station, the oil storage tank of the three-well refueling station leaks in the same year, and the leaked gasoline spreads to municipal sewer pipelines; in the south-Su area, leakage detection is carried out on 29 gas stations, 21 gas stations have leakage with different degrees, accounting for 72.4% of the total number of the gas stations to be investigated, and 12 gas stations in 20 gas stations have leakage phenomena more than 15 years ago; in 2008, oil pipelines of Guangzhou Guangde gas stations leak, and leaked oil permeates nearby sidewalks. After the oil product leaks, part of the oil product is removed through volatilization, degradation and the like, but part of the petroleum hydrocarbon can be retained in the natural environment for a long time, so that the soil and the underground water are polluted, and the human health is threatened. To date, petroleum hydrocarbon pollution has become an important factor in soil and groundwater pollution.
The leaked oil products of the gas station and the finished product oil depot storage tank are mainly gasoline and diesel oil, and the pollution components mainly comprise gasoline and diesel oil, benzene series, polycyclic aromatic hydrocarbon, MTBE and the like. Gasoline and diesel oil are mixture, and the gasoline component mainly includes C4-C12 aliphatic hydrocarbon and cyclic hydrocarbon, including partial olefin, small amount of aromatic hydrocarbon, sulfide, etc. The diesel oil mainly contains C10-C22 hydrocarbons, which generally comprise 67.69% of alkanes, 15.22% of cycloalkanes, 17.09% of aromatic hydrocarbons (comprising monocyclic aromatic hydrocarbons, polycyclic aromatic hydrocarbons, heterocyclic aromatic hydrocarbons and the like) and 0.40% of colloid. Benzene series (BETX) mainly comprises benzene, toluene, ethylbenzene, xylene, styrene and the like. Various studies and testifies that benzene series organisms are toxic to organisms and can cause direct harm to human health. BTEX has been studied to cause symptoms such as neurasthenia, headache, insomnia, vertigo, lower limb fatigue and genetic toxicity (DNA damage), and can cause anemia and leukemia in human body after long-term contact.
The oil pollution remediation technology is classified according to disposal sites, and the remediation modes of the oil pollution soil mainly comprise in-situ remediation and ex-situ remediation, wherein the in-situ remediation has the characteristics of low investment and small influence on the surrounding environment. The main categories of the repair technology include physical repair, chemical repair, biological repair and the like, each repair technology has the application range and the advantages and disadvantages,
soil gas phase Extraction (SVE) is a Soil in-situ remediation technology, negative pressure is generated by the Extraction action of a vacuum pump, directional flow of air is formed in a Soil unsaturated zone, and volatile and semi-volatile organic matters in Soil gaps are desorbed and carried out when the air flows through a polluted area, so that the purpose of purifying the Soil is achieved, and the method is mainly used for remedying the volatile and semi-volatile organic pollutants. Compared with the ectopic remediation technology, the SVE is a soil remediation method with better technical and economic performance.
An aeration remediation technology (AS) for groundwater pollution is an in-situ remediation technology for volatile organic pollutants in soil and groundwater in a saturated region. As sprays fresh air into the soil and underground water in the saturation area through the blower, the air is transported in the soil porous medium under the action of buoyancy and pressure gradient, so that pollutants are volatilized and rise from soil gaps and underground water to be removed by the ground treatment system.
Under the common condition, the underground water aeration remediation technology (AS) is combined with the soil vapor extraction technology (SVE), and after the air containing volatile organic pollutants rises to an aeration zone, the volatile organic pollutants are collected and treated by a soil vapor extraction centralized treatment system, so that the purpose of removing the volatile organic pollutants is achieved.
The combination of the groundwater aeration remediation technology (AS) and the soil vapor extraction technology (SVE) is very effective for volatile organic compounds, but the organic pollutants except the light volatile petroleum hydrocarbon components are difficult to completely remove due to the strong adsorption effect of the organic compounds and the soil matrix, the relatively weak volatilization capacity of the semi-volatile organic pollutants and the like.
The low-temperature thermal desorption in-situ soil restoration technology is characterized in that hot air is heated to a certain temperature through direct or indirect heat exchange, and when gas flows through soil gaps, volatilization and desorption of volatile semi-volatile organic pollutants in soil and underground water are accelerated, so that the restoration target is achieved.
At present, in the prior art, single technical research is carried out on in-situ remediation technologies such AS an underground water aeration remediation technology (AS), a soil vapor extraction technology (SVE) and the like, and partial field experiments are carried out successively, but the three technologies are combined to make up for deficiencies and achieve advantage complementation, so that a combined remediation technology for improving the remediation effect of organic pollutants in soil and underground water is still blank in technical research and engineering implementation.
Therefore, the invention provides a method for strengthening in-situ remediation of petroleum hydrocarbon contaminated soil by hot ventilation, so as to solve the problems.
Disclosure of Invention
The invention aims to provide a method for in-situ remediation of petroleum hydrocarbon contaminated soil through thermal ventilation enhancement, which combines the remediation technologies such AS SVE, AS and low-temperature thermal desorption to achieve the effects of making up for deficiencies of others and complementing advantages, can remarkably improve the remediation efficiency of light oil contaminated sites such AS gasoline and diesel oil, and can effectively fulfill the aim of in-situ remediation of the contaminated sites of finished oil in gas stations, oil depots and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for strengthening in-situ remediation of petroleum hydrocarbon contaminated soil by thermal ventilation comprises the following steps:
s1, determining the pollution range and the concentration distribution of pollutants in a polluted site, and laying an extraction well and an injection well;
s2, performing gas phase extraction and remediation of the soil through a vacuum extraction system, and performing underground water aeration and low-temperature thermal desorption and in-situ remediation of the soil through a blast injection system;
s3, repeating the step S2 until the concentration of the pollutants in the polluted site is reduced to 0.45% -5% of the original concentration of the pollutants, and completing the in-situ remediation of the polluted soil.
Preferably, the contamination range and the concentration distribution of the contaminants of the contaminated site are determined by the membrane interface probe in step S1.
Preferably, the influence radius of the extraction well in the step S1 is set to be 2.5 m to 5 m, the injection wells are arranged according to the groundwater pollution plume condition, the injection wells in the high-concentration pollution area are arranged more densely than the low-concentration pollution area, and the extraction well and the injection wells are arranged at intervals.
Preferably, the vacuum extraction system in step S2 includes a vacuum pump, a gas-liquid separator, a gas purification device and a liquid purification device; the blowing injection sledge comprises a blowing heating device and a dosing device; wherein the content of the first and second substances,
the vacuum pump is connected with the extraction well; the fluid inlet of the gas-liquid separator is connected with the vacuum pump; the gas inlet of the gas purification device is connected with the gas outlet of the gas-liquid separator; a liquid inlet of the liquid purification device is respectively connected with a liquid outlet of the gas-liquid separator and a liquid outlet of the dosing device; the blast heating device comprises a heater connected with the injection well and a blast fan connected with the heater; and the liquid outlet of the dosing device is respectively connected with the injection well and the liquid inlet of the liquid purification device.
Preferably, in step S2, the soil vapor extraction remediation is performed by a vacuum extraction system, and the groundwater aeration remediation and the soil low-temperature thermal desorption in-situ remediation are performed by a blast injection system, which specifically includes:
s201, starting a vacuum pump in a vacuum extraction system, performing soil vapor extraction on an extraction well, and monitoring and recording the concentration of pollutants in the extraction well before the operation of the vacuum pump;
s202, after the concentration of pollutants in the extraction well reaches a stable value, starting a blower in a blower injection system to inject air into an injection well for underground aeration while operating a vacuum pump, and starting a chemical adding device to inject a soil remediation agent into the injection well for underground aeration remediation; after the concentration of the pollutants in the extraction well reaches a stable value, continuously operating the vacuum pump, the blower and the dosing pump for 1-2 hours, and then sequentially stopping operating the blower, the dosing pump and the vacuum pump;
s203, repeating the process of the step S202 for 8-10 times every day, and after the concentration of the pollutants in the extraction well reaches relatively stable and continues for 20-30 days, starting a heater in a blast injection skid to heat air introduced into an injection well while running a blower to perform underground aeration, so as to perform low-temperature thermal desorption in-situ remediation on the soil;
and S204, after the heater is started, continuously repeating the process of the steps S201 to S203 for 8-10 times every day, and in the process, operating the heater while operating the air blower to perform combined remediation of the soil vapor extraction remediation, the underground water aeration remediation and the soil low-temperature thermal desorption in-situ remediation.
In the steps, at the initial stage of operation of the vacuum pump, the concentration of volatile pollutants in the extraction well is rapidly reduced, and the blower is started to be operated after the concentration of the volatile pollutants reaches a stable value; vacuum is formed in soil gaps through soil vapor extraction, so that a gas circulation channel from the periphery to an extraction well is established in an aeration zone, and volatile organic gas in the soil gaps is entrained in the gas flowing process, so that the soil pollutant remediation target is achieved; the method comprises the following steps of starting a blower, introducing air into an injection well, injecting air into soil and underground water in a saturated zone, enabling the air to migrate in a soil gap medium under the action of buoyancy and pressure gradient, and discharging the air from an extraction well through an air circulation channel established in a soil gap under the extraction action of a vacuum pump, wherein the concentration of volatile organic pollutants in the extraction well is remarkably improved at the initial stage of injecting the air into the injection well; after the heater is started, the hot air is contacted with the organic matters adsorbed in the soil particles in the transfer process, the desorption efficiency of the organic matters on the soil particles is improved, and the desorption efficiency is increased by about 1 time when the gas temperature is increased by 10 degrees.
Preferably, step S201 further includes the steps of separating the soil gas extracted by the vacuum pump through a gas-liquid separator, purifying the separated gas through a gas purification device, and purifying the separated liquid through a liquid purification device.
Preferably, in step S201, the gas purification device includes a tail gas adsorption device, or a cold dryer and a tail gas adsorption device, a gas inlet of the tail gas adsorption device is connected to a gas outlet of the gas-liquid separator, and the cold dryer is disposed between the tail gas adsorption device and the gas-liquid separator; step S201 further includes a step of separating the soil gas extracted by the vacuum pump through a gas-liquid separator, and purifying the separated gas through a tail gas adsorption device, or through a cold dryer and the tail gas adsorption device.
Preferably, in step S201, the liquid purification device includes a medicament buffering device and an oil-water separation device, a liquid inlet of the medicament buffering device is connected to a liquid outlet of the gas-liquid separator and a liquid outlet of the chemical dosing device, respectively, and a liquid inlet of the oil-water separation device is connected to a liquid outlet of the medicament buffering device; step S201 further includes the steps of separating the soil gas extracted by the vacuum pump through a gas-liquid separator, and purifying the separated liquid by entering an oil-water separation device through a medicament buffer device.
Preferably, the step S201 further includes starting a dosing device in the blowing injection system, and injecting a soil remediation agent into a medicament buffering device in the vacuum extraction system; separating the soil gas extracted by the vacuum pump through a gas-liquid separator, mixing the separated liquid with the soil remediation agent in a medicament buffer device, and purifying the mixture by a liquid purification device.
Preferably, a self-priming pump is arranged between the gas-liquid separator and the liquid purification device in the vacuum extraction system in step S201, the self-priming pump is further connected with the extraction well, step S201 further includes the steps of starting the self-priming pump in the vacuum extraction system, extracting the groundwater in the extraction well, mixing the extracted groundwater with the liquid separated by the gas-liquid separator, and purifying by the liquid purification device.
Preferably, the amount of air injected into the injection well in step S202 is set to 1/2 to 1 times of the extraction amount of air extracted by the vacuum pump.
Preferably, the heating temperature for heating the air introduced into the injection well in step S203 is 50 to 60 ℃.
The invention also provides a thermal ventilation reinforced petroleum hydrocarbon polluted soil in-situ remediation device used by the remediation method, which comprises a vacuum extraction system and a blast injection sledge; the vacuum extraction system comprises a vacuum pump, a gas-liquid separator, a gas purification device and a liquid purification device; the air blowing injection sledge comprises an air blowing heating device and a dosing device:
the vacuum pump is connected with the extraction well and is used for extracting underground water and soil gas;
the fluid inlet of the gas-liquid separator is connected with the vacuum pump and is used for carrying out gas-liquid separation on underground water and soil gas pumped out by the vacuum pump;
the gas inlet of the gas purification device is connected with the gas outlet of the gas-liquid separator and is used for removing volatile organic compounds contained in the gas separated by the gas-liquid separator;
a liquid inlet of the liquid purification device is respectively connected with a liquid outlet of the gas-liquid separator and a liquid outlet of the dosing device and is used for removing oily sewage in the liquid separated by the gas-liquid separator;
the blowing heating device is connected with the injection well and is used for blowing hot air into the injection well to remove volatile and semi-volatile organic pollutants in soil;
and the liquid outlet of the dosing device is respectively connected with the injection well and the liquid inlet of the liquid purification device, and is used for injecting a soil remediation medicament into the injection well and providing the soil remediation medicament for the liquid purification device in the vacuum extraction system.
Preferably, the vacuum extraction system further comprises a buffer device arranged between the extraction well and the vacuum pump.
Preferably, gas purification device includes tail gas adsorption equipment, tail gas adsorption equipment's air inlet with gas-liquid separator's gas outlet is connected for adsorb the volatile organic compounds in the soil gas.
Preferably, the gas purification device further comprises a cold dryer, wherein the cold dryer is arranged between the tail gas adsorption device and the gas-liquid separator and used for removing volatile organic compounds contained in soil gas extracted by a vacuum pump through cooling.
Preferably, the liquid purification device comprises a medicament buffer device and an oil-water separation device, a liquid inlet of the medicament buffer device is respectively connected with a liquid outlet of the gas-liquid separator and a liquid outlet of the dosing device, and a liquid inlet of the oil-water separation device is connected with a liquid outlet of the medicament buffer device; the agent buffering device is used for mixing liquid separated by the soil remediation agent and the gas-liquid separator, the oil-water separation device is used for separating oily sewage in the mixed liquid, separated oil stains enter the oil recovery device, and the separated sewage is discharged to the sewage drainage pipeline system.
Preferably, the oil-water separation device comprises a coarse filter and an oil-water filter; the liquid inlet of the coarse filter is connected with the liquid outlet of the medicament buffering device, and the liquid outlet of the coarse filter is connected with the liquid inlet of the oil-water filter; the coarse filter is used for preliminarily filtering mixed liquid output by the medicament buffering device, and the oil-water filter is used for carrying out oil-water separation on the liquid output by the coarse filter.
Preferably, a self-priming pump is arranged between the gas-liquid separator and the liquid purification device in the vacuum extraction system, and further, the self-priming pump is also connected with the extraction well and is used for extracting the underground water and/or the liquid separated by the gas-liquid separator in the extraction well, and at the moment, the liquid purification device is used for removing the oily sewage in the underground water and/or the liquid separated by the gas-liquid separator extracted by the self-priming pump.
Preferably, the vacuum extraction system further comprises a vacuum pump circulating water air cooler, a liquid inlet of the vacuum pump circulating water air cooler is connected with a liquid outlet of the gas-liquid separator, and a liquid outlet of the vacuum pump circulating water air cooler is connected with the vacuum pump.
Preferably, the blast heating device in the blast injection skid comprises a heater connected to the injection well and a blower connected to the heater; the air blower is used for blowing air to the injection well, and the heater is used for heating the air output by the air blower, so that the air outlet temperature is increased, and the desorption efficiency of volatile semi-volatile organic pollutants in soil particles is increased.
Preferably, the dosing device in the blast injection sledge comprises a plurality of groups of dosing units which are arranged in parallel, and each group of dosing units comprises a medicament storage device for mixing the soil remediation agent and water and a dosing pump for pumping the mixed medicament in the medicament storage device into the injection well and the medicament buffer device respectively.
Preferably, a stirrer for uniformly stirring the soil remediation agent and water is arranged in the agent storage device.
Preferably, the medicament storage device is respectively connected with the water supply device and the soil remediation agent supply device.
In addition, unless otherwise specified, any range recited herein includes any subrange defined by the endpoints and any value therebetween, and any subrange defined by the endpoints or any value therebetween; the concentrations in the present invention are mass concentrations unless otherwise specified.
The invention has the following beneficial effects:
the method for in-situ remediation of the petroleum hydrocarbon contaminated soil by thermal ventilation reinforcement can extract light volatile pollution components in the site soil, such as straight-chain alkane, isoparaffin, aromatic hydrocarbon and the like of a gasoline section C6-C12, through an SVE process; through the AS process, light volatile pollution components such AS benzene series and the like in the field soil and the underground water can be removed; the air blowing heating device is used for improving the air outlet temperature and increasing the desorption efficiency of volatile semi-volatile organic pollutants in soil particles; removing volatile and semi-volatile organic compounds in soil and underground water by means of multiple alternate operation of an SVE (support vector Equipment), AS (application server) and hot air injection system; in the operation process of the system, hot air is transported in the soil gap to increase the oxygen content in the soil gap and underground water, so that the proliferation of petroleum hydrocarbon degrading bacteria in the soil and underground water of the field can be obviously improved, and the degradation of petroleum hydrocarbon pollutants in the soil and underground water is realized; the in-situ remediation technology has small field disturbance and small influence on the ground, and the whole process has no secondary pollution.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 shows a schematic diagram of a device for in situ remediation of hot ventilation enhanced petroleum hydrocarbon contaminated soil in example 1 of the present invention;
FIG. 2 shows a schematic view of a vacuum extraction system in example 1 of the present invention;
fig. 3 shows a schematic view of a blast heating apparatus in embodiment 1 of the present invention;
FIG. 4 is a schematic view showing a drug adding device in example 1 of the present invention;
FIG. 5 is a schematic diagram showing a site sample collection point of an oil filling station in embodiment 2 of the present invention;
the system comprises a vacuum pump 1, a gas-liquid separator 2, a gas purification device 3, a tail gas adsorption device 31, an air cooler 32, a liquid purification device 4, a medicament buffer device 41, an oil-water separation device 42, a coarse filter 421, an oil-water filter 422, an air blowing heating device 5, an air blower 51, a heater 52, a medicament feeding device 6, a medicament storage device 61, a stirrer 611, a medicament feeding pump 62, an extraction well 7, an injection well 8, a buffer device 9, a self-priming pump 10, a water supply device 11, a soil remediation agent supply device 12 and a vacuum pump circulating water air cooler 13.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below in connection with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
Example 1
The embodiment provides a thermal ventilation reinforced petroleum hydrocarbon contaminated soil in-situ remediation device, as shown in figures 1 to 4,
the method comprises the following steps:
the vacuum extraction system is used for extracting underground water and soil gas in the repair well and removing volatile organic compounds; the air blowing injection sledge is used for blowing air into the repair well and injecting a soil repair agent to remove volatile and semi-volatile organic compounds;
as shown in fig. 2, the vacuum extraction system comprises:
the vacuum pump 1 is connected with the extraction well 7 and used for extracting underground water and soil gas;
the fluid inlet of the gas-liquid separator 2 is connected with the vacuum pump and is used for carrying out gas-liquid separation on the underground water and the soil gas pumped out by the vacuum pump;
a gas purification device 3 for removing volatile organic compounds contained in the gas separated by the gas-liquid separator; the gas purification device 3 comprises a tail gas adsorption device 31, wherein a gas inlet of the tail gas adsorption device 31 is connected with a gas outlet of the gas-liquid separator 2 and is used for adsorbing volatile organic compounds in soil gas; the gas purification device 3 further comprises a cold dryer 32, wherein the cold dryer 32 is arranged between the tail gas adsorption device 31 and the gas-liquid separator 2, and is used for removing volatile organic compounds contained in soil gas extracted by a vacuum pump through cooling;
and a liquid purification device 4 for mixing groundwater and a soil remediation agent; the liquid purification apparatus 4 includes a chemical buffer 41 and an oil-water separator 42, and the oil-water separator 42 includes a coarse filter 421 and an oil-water filter 422; a liquid inlet of the medicament buffer device 41 is connected with a liquid outlet of the gas-liquid separator 2 and a liquid outlet of the dosing device 6 respectively, a liquid inlet of the coarse filter 421 is connected with a liquid outlet of the medicament buffer device 41, and a liquid outlet of the coarse filter 421 is connected with a liquid inlet of the oil-water filter 422; the medicament buffer device 41 is used for mixing a soil remediation medicament and liquid separated by the gas-liquid separator, the coarse filter is used for primarily filtering mixed liquid output by the medicament buffer device, the oil-water filter is used for carrying out oil-water separation on the liquid output by the coarse filter, separated oil dirt enters the oil recovery device, and the separated sewage is discharged to the sewage drainage pipeline system;
a self-sucking pump 10 is arranged between the gas-liquid separator 2 and the liquid purification device 4 in the vacuum extraction system, the self-sucking pump 10 is also connected with the extraction well 7 and is used for extracting the underground water and/or the liquid separated by the gas-liquid separator in the extraction well, and the liquid purification device 4 is used for removing the oily sewage in the underground water and/or the liquid separated by the gas-liquid separator 2 extracted by the self-sucking pump 10; in addition, the vacuum extraction system further comprises a vacuum pump circulating water air cooler 13, wherein a liquid inlet of the vacuum pump circulating water air cooler 13 is connected with a liquid outlet of the gas-liquid separator 2, and a liquid outlet of the vacuum pump circulating water air cooler 13 is connected with the vacuum pump 1; the vacuum extraction system also comprises a buffer device 9 arranged between the extraction well 7 and the vacuum pump 1;
the blast injection sledge in the thermal ventilation reinforced petroleum hydrocarbon contaminated soil in-situ remediation device comprises:
the blowing heating device 5, as shown in fig. 3, comprises a heater 52 connected with the injection well 8 and a blower 51 connected with the heater 52, wherein the blower 51 is used for blowing air to the injection well 8, and the heater 52 is used for heating the air output by the blower 51, increasing the outlet air temperature and increasing the desorption efficiency of volatile semi-volatile organic pollutants in soil particles;
and a dosing device 6, as shown in fig. 4, which comprises a plurality of groups of dosing units arranged in parallel, wherein each group of dosing units comprises a drug storage device 61 for mixing the soil remediation agent and water and a drug pump 62 for pumping the mixed drug in the drug storage device into the injection well 8 and the drug buffer device 41 respectively; wherein, a stirrer for uniformly stirring the soil remediation agent and water is arranged in the agent storage device 61; the liquid inlet of the medicament storage device 61 is respectively connected with the water supply device 11 and the soil remediation agent supply device 12.
Example 2
The embodiment provides a method for in-situ remediation of petroleum hydrocarbon contaminated soil through thermal ventilation enhancement, which adopts the device for in-situ remediation of petroleum hydrocarbon contaminated soil through thermal ventilation enhancement described in embodiment 1, and comprises the following steps:
1) in the storage tank landfill areaThe site area is about 200m by performing the site test2(length x width, 20m x 10m), collecting samples between each tank, and collecting 6 point soil samples, wherein the depth of each point collected sample is 0m, 0.5 m, 1.0 m, 1.5 m, 3.0 m and 6.0 m, as shown in FIG. 5;
collecting a soil sample by adopting a direct-push soil sampling device geoprobe on site, carrying out MIP (membrane interface probe) monitoring while drilling, and determining that the pollutants are gasoline and diesel oil, and the concentration range of the pollutants is 3500mg/kg plus 1000-; according to the field soil sample collection and MIP monitoring results, laying a Soil Vapor Extraction (SVE) extraction well and an injection well;
2) the vacuum pump is started up within 0-7 days, a Soil Vapor Extraction (SVE) process is carried out, the operation is carried out for 1 hour each time, the concentration of the volatile organic pollutants in the extraction well is monitored and recorded before the vacuum pump is started up and transported each day, and after the vacuum pump is started up and transported each time, the concentration of the volatile organic pollutants in the extraction well is reduced to 0mg/L after the vacuum pump is operated for 5 minutes;
3) starting from the 8 th day and ending until the 15 th day, starting a blower while starting a vacuum pump and carrying out the soil vapor extraction process, and introducing gas into an injection well, wherein the ventilation rate of the injection well meets 1/2 of the extraction gas rate. Similarly, before the vacuum pump is started up and transported every day, the concentration of the volatile organic pollutants in the extraction well is monitored and recorded; after the vacuum pump and the blower are started and transported each time, the concentration of the volatile organic pollutants in the extraction well is reduced to 0mg/L after the system runs for 15 minutes, and the running time is 1 hour each time.
4) Starting from day 15, operating a heater while starting to transport a vacuum pump and a blower every day, and introducing gas into an injection well to heat, wherein the heating temperature is 60 ℃; similarly, before the vacuum pump is started up and transported every day, the concentration of the volatile organic pollutants in the extraction well is monitored and recorded; after the whole system is started and transported every time, the concentration of the volatile organic pollutants in the extraction well is reduced to 0mg/L after the system runs for 40 minutes, and the running time of each time is still set to 1 hour;
5) the operation was repeated 8 times per day, starting on day 15;
6) beginning on day 30, injectionCollecting soil samples on site, screening and amplifying to obtain biological agent, and injecting into well at a ratio of 1m per hole3And d, then starting the vacuum pump, the blower and the heater, keeping the heating temperature at 60 ℃, and continuously operating for 10 days.
7) After the 40 th day, before the vacuum pump is started up and transported every day, the concentration of the volatile organic pollutants in the extraction well is monitored and recorded, at the moment, the concentration of the volatile organic pollutants is reduced to be below the detection limit, and then, the extraction well is continuously operated for 3 days under the state;
8) in a storage tank landfill area, a soil sample is collected, the oil content of the soil sample is about 100mg/kg, and the pollutant removal rate is 95%.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (10)
1. A method for strengthening in-situ remediation of petroleum hydrocarbon contaminated soil by thermal ventilation is characterized by comprising the following steps:
s1, determining the pollution range and the concentration distribution of pollutants in a polluted site, and laying an extraction well and an injection well;
s2, performing gas phase extraction and remediation of the soil through a vacuum extraction system, and performing underground water aeration and low-temperature thermal desorption and in-situ remediation of the soil through a blast injection system;
s3, repeating the step S2 until the concentration of the pollutants in the polluted site is reduced to 0.45% -5% of the original concentration of the pollutants, and completing the in-situ remediation of the polluted soil.
2. The method for enhancing in-situ remediation of petroleum hydrocarbon contaminated soil by thermal ventilation as claimed in claim 1, wherein the vacuum extraction system in step S2 comprises a vacuum pump, a gas-liquid separator, a gas purification device and a liquid purification device; the blowing injection sledge comprises a blowing heating device and a dosing device; wherein the content of the first and second substances,
the vacuum pump is connected with the extraction well; the fluid inlet of the gas-liquid separator is connected with the vacuum pump; the gas inlet of the gas purification device is connected with the gas outlet of the gas-liquid separator; a liquid inlet of the liquid purification device is respectively connected with a liquid outlet of the gas-liquid separator and a liquid outlet of the dosing device; the blast heating device comprises a heater connected with the injection well and a blast fan connected with the heater; and the liquid outlet of the dosing device is respectively connected with the injection well and the liquid inlet of the liquid purification device.
3. The method for in-situ remediation of petroleum hydrocarbon contaminated soil through thermal ventilation enhancement according to claim 2, wherein in step S2, the soil is subjected to vapor phase extraction remediation through a vacuum extraction system, and the groundwater aeration remediation and the soil low-temperature thermal desorption in-situ remediation are performed through a blast injection system, and specifically comprises:
s201, starting a vacuum pump in a vacuum extraction system, performing soil vapor extraction on an extraction well, and monitoring and recording the concentration of pollutants in the extraction well before the operation of the vacuum pump;
s202, after the concentration of pollutants in the extraction well reaches a stable value, starting a blower in a blower injection system to inject air into an injection well for underground aeration while operating a vacuum pump, and starting a chemical adding device to inject a soil remediation agent into the injection well for underground aeration remediation; after the concentration of the pollutants in the extraction well reaches a stable value, continuously operating the vacuum pump, the blower and the dosing pump for 1-2 hours, and then sequentially stopping operating the blower, the dosing pump and the vacuum pump;
s203, repeating the process of the step S202 for 8-10 times every day, and after the concentration of the pollutants in the extraction well reaches relatively stable and continues for 20-30 days, starting a heater in a blast injection skid to heat air introduced into an injection well while operating a blast blower, so as to perform low-temperature thermal desorption in-situ remediation on the soil;
and S204, after the heater is started, continuously repeating the process of the steps S201 to S203 for 8-10 times every day, and in the process, operating the heater while operating the air blower to perform combined remediation of the soil vapor extraction remediation, the underground water aeration remediation and the soil low-temperature thermal desorption in-situ remediation.
4. The method as claimed in claim 3, wherein the step S201 further comprises the steps of separating the soil gas extracted by the vacuum pump through a gas-liquid separator, purifying the separated gas through a gas purifier, and purifying the separated liquid through a liquid purifier.
5. The method for in-situ remediation of soil contaminated by petroleum hydrocarbons by thermal ventilation enhancement as claimed in claim 4, wherein the gas purification device in step S201 comprises a tail gas adsorption device, or a cold dryer and a tail gas adsorption device, wherein a gas inlet of the tail gas adsorption device is connected with a gas outlet of the gas-liquid separator, and the cold dryer is arranged between the tail gas adsorption device and the gas-liquid separator; step S201 further includes a step of separating the soil gas extracted by the vacuum pump through a gas-liquid separator, and purifying the separated gas through a tail gas adsorption device, or through a cold dryer and the tail gas adsorption device.
6. The method for in-situ remediation of soil contaminated by petroleum hydrocarbons by thermal ventilation enhancement as claimed in claim 4, wherein the liquid purification device in step S201 comprises a chemical buffer device and an oil-water separation device, wherein a liquid inlet of the chemical buffer device is connected to a liquid outlet of the gas-liquid separator and a liquid outlet of the chemical dosing device, respectively, and a liquid inlet of the oil-water separation device is connected to a liquid outlet of the chemical buffer device; step S201 further includes the steps of separating the soil gas extracted by the vacuum pump through a gas-liquid separator, and purifying the separated liquid by entering an oil-water separation device through a medicament buffer device.
7. The method for in-situ remediation of petroleum hydrocarbon contaminated soil by thermal ventilation enhancement as claimed in claim 6, wherein the step S201 further comprises starting a drug adding device in the blast injection system, and injecting a soil remediation agent into a drug buffering device in the vacuum extraction system; separating the soil gas extracted by the vacuum pump through a gas-liquid separator, mixing the separated liquid with the soil remediation agent in a medicament buffer device, and purifying the mixture by a liquid purification device.
8. The method according to claim 4, wherein a self-priming pump is arranged between the gas-liquid separator and the liquid purification device in the vacuum extraction system in step S201, the self-priming pump is further connected with the extraction well, and step S201 further comprises the steps of starting the self-priming pump in the vacuum extraction system, extracting the groundwater in the extraction well, mixing the extracted groundwater with the liquid separated by the gas-liquid separator, and purifying by the liquid purification device.
9. The method as claimed in claim 3, wherein the amount of air injected into the injection well in step S202 is 1/2 to 1 times the amount of air extracted by the vacuum pump.
10. The method as claimed in claim 3, wherein the heating temperature of the air introduced into the injection well in step S203 is 50-60 ℃.
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