CN113414234A - Method for remediating soil and underground water pollution by using in-situ low-consumption combined relay remediation device - Google Patents
Method for remediating soil and underground water pollution by using in-situ low-consumption combined relay remediation device Download PDFInfo
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- CN113414234A CN113414234A CN202110688632.1A CN202110688632A CN113414234A CN 113414234 A CN113414234 A CN 113414234A CN 202110688632 A CN202110688632 A CN 202110688632A CN 113414234 A CN113414234 A CN 113414234A
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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
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
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- 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
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- B09C1/005—Extraction of vapours or gases using vacuum or venting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
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Abstract
The invention discloses a method for remedying soil and underground water pollution by using an in-situ low-consumption combined relay remediation device. The invention can utilize different functions and optimal working intervals of each system, sequentially start different system combinations in the equipment, sequentially carry out a combined relay restoration mode of multiphase extraction-enhanced desorption-bioremediation on high-concentration organic polluted soil and underground water, and realize the targeted relay restoration of the characteristics of high-medium-low concentration of underground pollutants in the field step by step; or one or more system combinations in the integrated equipment are started to repair the pollution according to the requirements aiming at the specific pollution conditions in different organic pollution sites, the use method of the equipment is flexible and changeable, and the multiple purposes of one machine can be realized.
Description
Technical Field
The invention relates to a technology for repairing soil and underground water in the technical field of environmental protection, in particular to a low-consumption combined relay in-situ repairing device for multiphase extraction, enhanced desorption and bioremediation aiming at pollution of soil and underground water in a polluted site.
Background
The geological and hydrogeological conditions of the Yangtze river economic zone are complex, and as a key development area, a plurality of landfall petrochemical pollution sites are in service and most of the landfall petrochemical pollution sites are in service. For historical reasons, the levels of contamination of these field soils and groundwater vary widely, with some fields having significant contamination of non-aqueous liquids (NAPLs) with groundwater and others having contaminants only slightly above acceptable levels for human health.
For the petrochemical pollution sites in service, the in-situ remediation mode is usually adopted, and the method mainly has small interference on the normal operation of the sites because the method does not relate to large-scale dredging and carrying. In the in-situ remediation technology, the multiphase extraction technology is commonly used for the remediation treatment of typical organic pollutants in soil and underground water of petrochemical sites. The multiphase extraction technology is characterized in that vacuum is applied to an extraction well installed underground, soil gas, polluted underground water or non-aqueous phase liquid in an underground pollution area is simultaneously extracted to the ground in a form of a gas-water mixture, the gas, the liquid and the non-aqueous phase are separated and then respectively enter related treatment facilities on the ground, and the treatment is discharged or treated after reaching the standard.
However, in the process of repairing soil and groundwater, the method is limited by the heterogeneity of the stratum and the rate limitation of pollutant phase transfer, and the existing multiphase extraction system has high difficulty in extracting pollutants in the soil and groundwater residual non-aqueous phase liquid and non-gravity water type groundwater, and has low pollutant removal efficiency. Specifically, in the initial stage of operation of the existing multiphase extraction system, due to the application of a dropper in an extraction well, a flowing water phase in underground water can be effectively pumped out, and pollutants are removed through a waste water or tail gas treatment system on the ground. The water phase is mainly pumped out at this stage, and as long as the high vacuum degree is met, the vacuum equipment with low gas flow can meet the requirements. After the flowing water phase is pumped out, the system starts to pump out a gas-water mixture or pure soil gas, and the increase of the flow of the pumped gas can cause the rapid attenuation of the vacuum degree of the system. Pollutants in the non-gravity water type underground water at the stage can be removed by pumping out after entering the gravity water through molecular diffusion, or directly volatilized into soil gas, pumped out through vacuum and removed through a tail gas treatment system on the ground. The great reduction of the extraction vacuum degree can cause the volatilization rate of the pollutant underground water in the opposite soil gas to be limited, and the water phase extraction capacity is weakened, thereby causing the repair efficiency to be reduced. Therefore, the requirement of multi-phase extraction can be met only by a vacuum device with medium vacuum degree and high gas flow rate.
On the other hand, the existing single restoration technology and equipment in the current market are lack of universality, have poor applicability to different petrochemical pollution conditions of enterprises in the Yangtze river economic zone, and cannot meet the specific treatment requirement on the pollution of the petrochemical site at present. In practical applications, two or more kinds of remediation technologies are often required to be used simultaneously to meet the requirements for low-energy consumption and high-efficiency removal of pollutants with different pollutants and different pollution concentrations. Therefore, a set of green low-consumption in-situ combined relay repair technology and equipment system is urgently needed to be developed to realize targeted repair of petrochemical polluted sites and different repair stages of the same polluted site under different conditions.
Disclosure of Invention
The invention aims to provide an in-situ combined relay repairing method for multiphase extraction, enhanced desorption and bioremediation of soil and underground water pollution, which aims at solving the problems in the prior repairing technology and completes low-consumption and high-efficiency repairing of pollutants in an organic pollution site under various concentrations of high concentration, medium concentration and low concentration.
In order to achieve the aim, the invention provides a method for remediating soil and underground water pollution by using an in-situ low-consumption combined relay remediation device, wherein the device adopted in the method comprises a first multi-phase extraction vacuum system, a second multi-phase extraction vacuum system, an activated carbon adsorption system, a gas injection system and a dissolved gas injection system which are integrated on a platform; the first multiphase extraction vacuum system comprises a steam-water separator, a water ring vacuum pump, a gas-liquid separation tank, a demister and a diaphragm pump; the second multiphase extraction vacuum system comprises a steam-water separator, a demister, a Roots vacuum pump and a diaphragm pump; the active carbon adsorption system comprises a carbon adding platform, an active carbon adsorber, an induced draft fan and an exhaust funnel; the gas injection system comprises an air compressor; the dissolved air injection system comprises a dosing tank, a dissolved air pump, a large bubble separating tank and a pipe coiling device.
In the method for remedying the soil and groundwater pollution by using the in-situ low-consumption combined relay remediation device, the steam-water separator is provided with a box body in the first multiphase extraction vacuum system and the second multiphase extraction vacuum system, the box body is internally provided with a liquid level meter and a compressed air backwashing system, one side of the box body is provided with a steam-water inlet, the lower part of the other side of the box body is provided with a water outlet, and the top of the box body is provided with an exhaust port; the steam-water inlet is connected with a multiphase extraction well group arranged in the polluted production area through a pipeline, a drainage pipeline is arranged at the drainage outlet, and a diaphragm pump is arranged on the drainage pipeline.
The method for remedying the soil and underground water pollution by using the in-situ low-consumption combined relay remediation device is characterized in that the diaphragm pump is a pneumatic diaphragm pump and is connected with an air compressor of a gas injection system through a pipeline.
In the method for remedying the soil and underground water pollution by using the in-situ low-consumption combined relay remediation device, the demister in the first multi-phase extraction vacuum system and the second multi-phase extraction vacuum system consists of a wave-shaped blade, a plate and a fixed structure comprising a clamping strip.
The method for remedying the soil and underground water pollution by using the in-situ low-consumption combined relay remediation device comprises the following steps that a first multiphase extraction vacuum system is a water ring vacuum pump multiphase extraction system and is provided with a first diaphragm pump and a first demister; an exhaust port of a steam-water separator in the system is connected with one side of a water ring vacuum pump through a pipeline, and the other side of the water ring vacuum pump is respectively connected with one side of a gas-liquid separation tank through two pipelines to form a circulation loop; the gas-liquid separation jar is equipped with the cuboid box that carbon steel anticorrosive material made, and the box top is equipped with first defroster, and the other end of first defroster is equipped with the pipeline and connects gradually active carbon adsorption ware, draught fan and the aiutage of active carbon adsorption system.
The method for remedying the soil and underground water pollution by using the in-situ low-consumption combined relay remediation device comprises the following steps that a first multiphase extraction vacuum system is a Roots vacuum pump multiphase extraction system, and a first demister and a first diaphragm pump are arranged; the gas vent of catch water is connected with the second defroster in the system, and the other end of second defroster is equipped with the pipeline and connects gradually roots vacuum pump and active carbon adsorption ware, draught fan and aiutage of active carbon adsorption system.
In the method for remedying the soil and underground water pollution by using the in-situ low-consumption combined relay remediation device, the carbon adding platform in the activated carbon adsorption system is formed by welding steel structure materials and is installed and fixed above the activated carbon adsorber; granular activated carbon is arranged in the activated carbon adsorber as a filler; the draught fan is internally provided with an impeller, negative pressure is generated through rotation, waste gas is pumped out of the pipeline and is discharged in the high altitude through the exhaust funnel after being purified.
In the method for remedying the soil and underground water pollution by using the in-situ low-consumption combined relay remediation device, in the gas injection system, compressed air with the pressure of 0.6-0.8MPa generated by an air compressor is injected into the ground, and meanwhile, the compressed air is supplied to a pneumatic diaphragm pump as power.
In the dissolved air injection system, the dosing tank is provided with a cylindrical box body made of polyethylene materials, the top of the box body is provided with a solid/liquid medicament dosing opening, and is provided with a motor and a speed reducer, a stirring paddle connected with the speed reducer is arranged in the box body, and the bottom of the box body is provided with a medicament outlet and a valve; the medicament outlet is connected with the dissolved air pump through a medicament delivery pipe; the dissolved air pump is connected with the large bubble separation tank through a pipeline, the outlet of the large bubble separation tank is provided with the pipeline, and the other end of the pipeline is provided with an injection hose which is used as a medicament injection end; the dissolved air pump sucks in gas, then the gas is pressurized by the pump body to form small bubbles which are fully mixed with the liquid medicament and released by the injection end to generate micro bubbles; the pipe coiling device is used for quickly coiling an injection hose and is made of stainless steel materials.
The method for remediating the soil and underground water pollution by using the in-situ low-consumption combined relay remediation device comprises the following steps: s1, running period A of the multiphase extraction system: starting a first multiphase extraction vacuum system, namely a water ring vacuum pump multiphase extraction system, and pumping a single liquid phase or a gas-liquid mixture mainly comprising the liquid phase out of the ground to reduce the load of underground pollutants; s2, and the running period B of the multiphase extraction system: closing the water ring vacuum pump multiphase extraction system, starting a second multiphase extraction vacuum system, namely a Roots vacuum pump multiphase extraction system, and pumping a gas-water mixture or single soil gas mainly comprising a gas phase from the underground to further reduce the load of underground pollutants; s3, strengthening the desorption period: for organic pollutants in the aeration zone soil, compressed air is injected into the aeration zone by an air compressor to reduce the partial pressure of gas-phase pollutants, and meanwhile, desorption and extraction of the organic pollutants are assisted by flow increase, so that the removal effect of the pollutants is enhanced; for organic pollutants in soil and underground water in a saturated zone, a dissolved gas injection system is used for injecting dissolved gas water into the saturated zone, and the concentration of the pollutants in a water phase, particularly non-gravity water, is reduced, the partial pressure of the pollutants in the soil gas in the aeration zone is reduced, the desorption, diffusion and extraction of the pollutants are promoted, and the removal effect of the pollutants is enhanced by combining pumping and injection; s4, bioremediation: selecting proper strains, nutrients, pH regulators and gas according to the types of underground pollutants, and injecting the selected bacteria, nutrients, pH regulators and gas into the ground by using a dissolved gas injection system to carry out in-situ microbial remediation so as to ensure that the remediation target is achieved; s5, for a high-concentration pollution scene, sequentially executing S1 and S2 at the initial stage of multiphase extraction operation; synchronously or alternatively executing S1 and S2 or S3 in the middle and later stages of the multiphase extraction operation; after the multiphase extraction is finished, S4 is executed to realize the multiphase extraction, the enhanced desorption and the bioremediation relay repair; and for the medium-low concentration pollution scene, directly starting to repair from a certain link in the middle.
The method for remedying the soil and underground water pollution by using the in-situ low-consumption combined relay remediation device has the following advantages:
(1) the integrated design is adopted, the first multi-phase extraction vacuum system, the second multi-phase extraction vacuum system, the tail gas activated carbon adsorption system, the dissolved gas injection system and the gas injection system are integrated on a skid-mounted platform, the structure is compact, the space is saved, the transportation and the movement of equipment between fields and in the fields are facilitated, the labor time is further shortened, the planning steps of entering, deploying and withdrawing of a plurality of devices are simultaneously omitted, and the engineering efficiency of soil and underground water remediation is improved.
(2) In the repairing method, a plurality of repairing technologies are jointly used, so that the whole repairing period can be covered, and in the relay in-situ repairing, each repairing technology can be applied to the most suitable environmental condition, so that the repairing efficiency is improved.
(3) The repairing method comprises a plurality of contact points, and in actual implementation, the implementation starting node of the repairing method can be determined according to site conditions, pollutant types, concentration conditions and the like. The judgment of different pollution concentrations of the relay node can be comprehensively judged according to the exceeding multiple of the pollutants and the existence of free equivalence, and finally the judgment is determined according to the field pilot test result.
(4) Through a system combining the multiphase extraction system and the gas injection system or the dissolved gas injection system for pumping and injecting, the influence radius of the repair system can be improved, and the repair effect is greatly improved;
(5) the use method is flexible and changeable, the system in the equipment can be used in a combined relay way, one or more repair units can be selected for independent use according to factors such as site conditions, target pollutants, pollutant concentration and the like, and for occasions without groundwater pollution and pollution concentration and the like, only the second multiphase extraction vacuum system and the gas injection system can be selected; for the occasion with low pollution concentration, only a dissolved air injection system can be selected for bioremediation.
Drawings
Fig. 1 is a schematic view of a first multiphase extraction vacuum system, namely a multiphase extraction + water ring vacuum pump system, in the method of the present invention.
Fig. 2 is a schematic diagram of a second multiphase extraction vacuum system, i.e. a multiphase extraction + roots vacuum pump system, in the method of the present invention.
FIG. 3 is a schematic view of a dissolved air injection system in the method of the present invention.
FIG. 4 is a schematic plan view of a skid-mounted integrated platform in the method of the present invention.
Fig. 5 is a schematic cross-sectional view of a first multiphase extraction vacuum system, i.e., a multiphase extraction + water ring vacuum pump system, in the method of the present invention.
Fig. 6 is a schematic cross-sectional view of a second multiphase extraction vacuum system, i.e. a multiphase extraction + roots vacuum pump system, in the method of the invention.
FIG. 7 is a schematic sectional view of a steam-water separator and a diaphragm pump in the method of the present invention.
Wherein: 1. multiphase extraction well group; 2. a steam-water separator; 3-1, a first demister; 3-2, a second demister; 4. a water-ring vacuum pump; 5. a gas-liquid separation tank; 6. a Roots vacuum pump; 7. an activated carbon adsorber; 8. an induced draft fan; 9. an exhaust funnel; 10. an air compressor; 11-1, a first diaphragm pump; 11-2, a second diaphragm pump; 12. a dosing box; 13. a dissolved air pump; 14. a large bubble separation tank; 15. a liquid level meter; 16. a water leakage protection sensor; 17. a touch screen electric cabinet; 18. a carbon adding platform; 19. a pipe coiling device; 20. an integrated platform.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The invention provides a method for remedying soil and underground water pollution by using an in-situ low-consumption combined relay remediation device, which adopts a device comprising a first multi-phase extraction vacuum system, a second multi-phase extraction vacuum system, an activated carbon adsorption system, a gas injection system and a dissolved gas injection system which are integrated on a platform; namely, the system is integrated on a skid-mounted integrated platform 20.
The first multiphase extraction vacuum system comprises a steam-water separator 2, a water ring vacuum pump 4, a gas-liquid separation tank 5, a demister and a diaphragm pump; the second multiphase extraction vacuum system comprises a steam-water separator 2, a demister, a Roots vacuum pump 6 and a diaphragm pump; the activated carbon adsorption system comprises a carbon adding platform 18, an activated carbon adsorber 7, an induced draft fan 8 and an exhaust funnel 9; the gas injection system comprises an air compressor 10; the dissolved air injection system includes a dosing tank 12, a dissolved air pump 13, a large bubble separation tank 14, and a pipe winder 19. The device is also provided with a touch screen electric cabinet 17.
In the first multi-phase extraction vacuum system and the second multi-phase extraction vacuum system, the steam-water separator 2 adopts a unique design to realize the separation of NAPL (non-aqueous phase liquid pollutant), groundwater, soil particles and gas. The steam-water separator 2 is provided with a box body, a liquid level meter 15 is arranged in the box body, and continuous operation of the system is ensured by interlocking the drainage of the subsequent diaphragm pump; in order to prevent the system silt from depositing at the bottom of the box body, a compressed air backwashing system is also arranged in the box body, a steam-water inlet is arranged at one side of the box body, a water outlet is arranged at the lower part of the other side of the box body, and an exhaust port is arranged at the top of the box body; the steam-water inlet is connected with the multiphase extraction well group 1 arranged in the polluted production place through a pipeline, a drainage pipeline is arranged at the position of the drainage outlet, and a diaphragm pump is arranged on the drainage pipeline.
The diaphragm pump is a pneumatic diaphragm pump and is connected with an air compressor 10 of the gas injection system through a pipeline. The air source of the pneumatic diaphragm pump is supplied by an air compressor 10 and is used for draining water and mud of the steam-water separator 2.
The demister comprises wave-shaped blades, plates and a fixing structure comprising clamping strips and the like, and is used for separating liquid drops volatilized from the gas-liquid separation tank 5 and improving the adsorption capacity of subsequent activated carbon. A water leakage protection sensor 16 is arranged in the demister.
The first multiphase extraction vacuum system is a water ring vacuum pump multiphase extraction system and is provided with a first diaphragm pump 11-1 and a first demister 3-1; an exhaust port of the steam-water separator 2 in the system is connected with one side of a water ring vacuum pump 4 through a pipeline, and the other side of the water ring vacuum pump 4 is respectively connected with one side of a gas-liquid separation tank 5 through two pipelines to form a circulation loop. The water ring vacuum pump 4 is suitable for a system which stably operates at a low flow rate and a high vacuum degree.
The gas-liquid separation tank 5 is provided with a cuboid box body made of carbon steel anticorrosive materials and used for water supplement and gas-liquid separation of the water ring vacuum pump. The top of the box body is provided with a first demister 3-1, and the other end of the first demister 3-1 is provided with a pipeline and is sequentially connected with an activated carbon adsorber 7, an induced draft fan 8 and an exhaust funnel 9 of an activated carbon adsorption system.
The second multiphase extraction vacuum system is a Roots vacuum pump multiphase extraction system and is provided with a second demister 3-2 and a second diaphragm pump 11-2; an exhaust port of the steam-water separator 2 in the system is connected with a second demister 3-2, and the other end of the second demister 3-2 is provided with a pipeline and is sequentially connected with a Roots vacuum pump 6, an activated carbon adsorber 7 of an activated carbon adsorption system, an induced draft fan 8 and an exhaust funnel 9. The Roots vacuum pump 6 is suitable for a system which stably operates at medium-low vacuum degree and high flow.
The steam-water separator 2 in the first multiphase extraction vacuum system and the second multiphase extraction vacuum system can be preferably the same one-level steam-water separator, and the box body is respectively provided with two sets of steam-water inlets, water outlets and air outlets for connecting other parts of the multiphase extraction system of the water ring vacuum pump and the multiphase extraction system of the Roots vacuum pump.
In the active carbon adsorption system, namely the tail gas active carbon adsorption system, the carbon adding platform 18 is formed by welding steel structure materials and is installed and fixed above the active carbon adsorber 7, so that manual feeding and material changing are facilitated.
Granular activated carbon is arranged in the activated carbon adsorber 7 as a filler and is used for adsorbing organic pollutants in the gas to be treated so as to purify the gas to be treated.
An impeller is arranged in the draught fan 8, negative pressure is generated through rotation, waste gas generated in the front end system is pumped to the rear end from the pipeline, and purified gas is discharged in the high altitude through the exhaust funnel 9.
In the gas injection system, an air compressor 10, namely an air compressor, takes air as a compression medium, generates compressed air with the pressure of about 0.6-0.8MPa, can be injected underground, and simultaneously can supply the compressed air to a pneumatic diaphragm pump as the power of a pump.
In the dissolved air injection system, the dosing tank 12 is provided with a cylindrical tank body made of Polyethylene (PE) material, the top of the tank body is provided with a solid/liquid medicament dosing opening, and is provided with a motor and a speed reducer, a stirring paddle connected with the speed reducer is arranged in the tank body, and a medicament outlet and a valve are arranged at the bottom of the tank body; the prepared liquid medicament is connected with the dissolved air pump 13 through a medicament outlet through a medicament delivery pipe; the dissolved air pump 13 is connected with the large bubble separation tank 14 through a pipeline, the outlet of the large bubble separation tank 14 is provided with a pipeline, and the other end of the pipeline is an injection hose which is used as a medicament injection end; the tube coiling device 19 is made of stainless steel materials and used for quickly coiling an injection hose, and field operation is convenient.
The dissolved air pump 13 sucks air, then pressurizes the air to form small bubbles through the pump body, the small bubbles are fully mixed with the liquid medicament, and micro bubbles are generated after the small bubbles are released through the injection end.
The method comprises the following steps:
s1, running period A of the multiphase extraction system: and starting a first multiphase extraction vacuum system, namely a water ring vacuum pump multiphase extraction system, and pumping a single liquid phase or a gas-liquid mixture mainly comprising the liquid phase out of the ground to reduce the load of underground pollutants.
S2, and the running period B of the multiphase extraction system: and closing the water ring vacuum pump multiphase extraction system, and opening a second multiphase extraction vacuum system, namely a Roots vacuum pump multiphase extraction system, so as to pump out a gas-water mixture or single soil gas mainly comprising a gas phase from the underground, thereby further reducing the load of underground pollutants.
S3, strengthening the desorption period: for organic pollutants in the aeration zone soil, compressed air is injected into the aeration zone by an air compressor to reduce the partial pressure of gas-phase pollutants, and meanwhile, desorption and extraction of the organic pollutants are assisted by flow increase, so that the removal effect of the pollutants is enhanced; for organic pollutants in soil and underground water in a saturated zone, dissolved air water is injected into the saturated zone by using a dissolved air injection system, and the concentration of the pollutants in a water phase, particularly non-gravity water, is reduced, the partial pressure of the pollutants in the soil gas in the aeration zone is reduced, the desorption, diffusion and extraction of the pollutants are promoted, and the removal effect of the pollutants is enhanced by combining pumping and injection.
The enhanced desorption is shown in 1) the turbulence degree of the surface of the soil particles in the aeration zone is increased through the injection of compressed air, and the diffusion of organic pollutants in the soil to soil gas is increased; 2) the partial pressure of the pollutants in the soil gas is reduced by injecting compressed air into the aeration zone, so that the power of the pollutants for volatilizing into the soil gas is increased and the pollutants are pumped out along with a vacuum system; 3) by injecting the dissolved air water and combining pumping and injecting, the turbulence degree of the surface of the saturated zone soil particles is increased, the diffusion of organic pollutants in the underground water from the non-gravity water phase to the gravity water phase is increased, the desorption of the soil phase pollutants to the underground water phase is enhanced, and the soil phase pollutants are pumped out along with a vacuum system; 4) the injection of the dissolved air water also directly reduces the concentration of the liquid phase pollutant and helps the desorption of the soil phase pollutant to the underground water phase.
S4, bioremediation: according to the type of underground pollutants, selecting proper strains, nutrients, pH regulators and gas, and injecting the selected materials into the ground by using a dissolved gas injection system to carry out in-situ microbial remediation so as to ensure that the remediation target is achieved.
When the type of the site pollutant is biodegradable organic matter, nutrient solution or biological strains are injected into the ground in the bioremediation stage, and the micro bubbles can help the nutrient solution or the biological strains to diffuse and mix in the ground. In addition, the introduction of air can help change the oxidation-reduction potential of underground water and help the growth of aerobic bacteria. When the strain is anaerobic bacteria, nitrogen gas can be used instead of air injection.
S5, for a high-concentration pollution scene, sequentially executing S1 and S2 at the initial stage of multiphase extraction operation; synchronously or alternatively executing S1 and S2 or S3 in the middle and later stages of the multiphase extraction operation; after the multiphase extraction is finished, S4 is executed to realize the multiphase extraction, the enhanced desorption and the bioremediation relay repair; and for the medium-low concentration pollution scene, directly starting to repair from a certain link in the middle.
The method for remediating contaminated soil groundwater by using the in-situ low-consumption combined relay remediation device provided by the invention is further described with reference to the following examples.
Example 1
A combined relay repairing method with low consumption in situ for polluted soil and underground water includes such steps as multi-phase extraction, strengthened desorption and bioremediation.
The device comprises a first multi-phase extraction vacuum system, a second multi-phase extraction vacuum system, a tail gas activated carbon adsorption system, a dissolved gas injection system and a gas injection system, and the systems are integrated on a skid-mounted integrated platform 20.
The first multiphase extraction vacuum system is a water ring vacuum pump multiphase extraction system and comprises a steam-water separator 2, a first demister 3-1, a water ring vacuum pump 4, a gas-liquid separation tank 5 and a first diaphragm pump 11-1. See fig. 1, 4, 5 and 7.
The size of the steam-water separator 2 is 1000 multiplied by 1600 multiplied by 1300mm, and the separation of NAPL, underground water, solid and gas is realized by adopting a unique design; a liquid level meter 15 is arranged in a box body of the water pump, and continuous operation of the system is ensured by interlocking a subsequent water pump; meanwhile, in order to prevent the sediment of the system from depositing at the bottom of the box body, a compressed air backwashing system is also arranged in the box body.
The flow rate of the water ring vacuum pump 4 is 3.83m3Min, absolute pressure of 0.033MPa, power of less than or equal to 5.5kw, and is suitable for a system which stably operates in low flow and high vacuum degree.
The diaphragm pump selects the pneumatic diaphragm pump for use, and the air supply is supplied with by air compressor 10 for 2 drainage of catch water and row mud.
The gas-liquid separation tank 5 is a cuboid box body made of carbon steel anticorrosive materials and is used for water supplement and gas-liquid separation of the water ring vacuum pump 4.
The first demister 3-1 mainly comprises a wave-shaped blade, a plate, a clamping strip and other fixing structures, and is used for separating liquid drops volatilized from the gas-liquid separation tank 5 and improving the adsorption capacity of subsequent activated carbon.
The second multiphase extraction vacuum system is a Roots vacuum pump multiphase extraction system and comprises a steam-water separator 2, a second demister 3-2, a Roots vacuum pump 6 and a second diaphragm pump 11-2. See fig. 2, 4, 6 and 7.
The design and the function of the steam-water separator 2, the second demister 3-2 and the second diaphragm pump 11-2 are the same as those of the corresponding components in the first multiphase extraction vacuum system.
The flow rate of the Roots vacuum pump 6 is 5.73m3Min, absolute pressure of 0.095MPa, power less than or equal to 7.5kw, and stable operationLow vacuum degree and high flow rate.
The tail gas active carbon adsorption system comprises a carbon adding platform 18, an active carbon adsorber 7, an induced draft fan 8 and an exhaust funnel 9. See fig. 1, 2 and 4.
The carbon adding platform 18 is formed by welding steel structure materials and is installed and fixed above the activated carbon absorber 7, so that manual feeding and material changing are facilitated.
The internal filler of the activated carbon adsorber 7 is granular activated carbon, which is used for adsorbing organic pollutants in the gas to be treated and purifying the gas to be treated.
The induced draft fan 8 rotates through the impeller and produces the negative pressure, takes out the waste gas that produces in the front end system to the rear end from the pipeline, and the gas after the purification is discharged in the high altitude through aiutage 9.
The exhaust funnel 9 has a diameter of 30cm and a height of 15m, and is formed by welding galvanized pipes.
The dissolved air injection system, i.e., a drug injection system, includes a dosing tank 12, a dissolved air pump 13, a large bubble separation tank 14, and a tube winding device 19. See fig. 3 and 4.
The dispensing box 12 is a circular barrel-shaped box body made of PE material, the top of the dispensing box is provided with a solid/liquid medicament dispensing opening, the dispensing box is provided with a motor and a speed reducer, the inside of the dispensing box is provided with a stirring paddle connected with the speed reducer, the bottom of the dispensing box is provided with a medicament outlet and a valve, and the dispensing box is connected with a dissolved air pump 13 through a medicament conveying pipe.
The dissolved air pump 13 is connected with the large bubble separation tank 14 through a pipeline, the outlet of the large bubble separation tank 14 is provided with a pipeline, and the other end of the pipeline is an injection hose which is used as a medicament injection end. The dissolved air pump 13 sucks air, then pressurizes the air to form small bubbles through the pump body, the small bubbles are fully mixed with the liquid medicament, and micro bubbles are generated after the small bubbles are released through the injection end.
The tube winder 19 is made of stainless steel material and is used for rapidly retracting the injection hose.
The gas injection system mainly comprises an air compressor 10. The air compressor 10 uses air as a compression medium, and supplies the generated gas with the pressure of about 0.6-0.8MPa to a pneumatic diaphragm pump or injects the gas into an underground air-bag. See fig. 1, 2 and 4.
Example 2
A method for remediating soil and groundwater pollution by using an in-situ low-consumption combined relay remediation device comprises the following steps:
s1, running period A of the multiphase extraction system: a first multiphase extraction vacuum system, namely a water ring vacuum pump multiphase extraction system, is started, and a single liquid phase or a gas-liquid mixture mainly comprising the liquid phase is mainly pumped out from the underground, so that the load of underground pollutants is quickly reduced.
S2, and the running period B of the multiphase extraction system: the multiphase extraction system of the water ring vacuum pump is closed, the multiphase extraction system of the Roots vacuum pump is started, and mainly a gas-water mixture or single soil gas which mainly takes gas phase is pumped out from the underground, so that the load of underground pollutants is further reduced.
S3, strengthening the desorption period: for organic pollutants in the aeration zone soil, compressed air can be injected into the aeration zone by using an air compressor 10 to reduce the partial pressure of gas-phase pollutants, help desorption and extraction of the organic pollutants and strengthen the removal effect of the pollutants; for organic pollutants in soil and underground water in a saturated zone, a dissolved gas injection system can be used for injecting dissolved gas water into the saturated zone so as to reduce the concentration of water phase pollutants, particularly non-gravity water pollutants, reduce the partial pressure of the pollutants in the soil gas in the aeration zone, promote the desorption, diffusion and extraction of the pollutants and strengthen the removal effect of the pollutants.
S4, bioremediation period: according to the type of underground pollutants, selecting proper strains, nutrients, pH regulators and gases, and injecting the selected gases into the ground by using a separately arranged dissolved gas injection system to carry out in-situ microbial remediation so as to ensure that the remediation target is achieved.
The type of the site pollutant can be biodegradable organic matters, nutrient solution or biological strains are injected into the underground in the bioremediation stage, and the micro bubbles can help the nutrient solution or the biological strains to diffuse and mix in the underground. In addition, the introduction of air can help change the oxidation-reduction potential of underground water and help the growth of aerobic bacteria.
S5, sequentially carrying out S1 and S2 at the initial operation stage of the multiphase extraction system; synchronously executing the middle and later stages S2 and S3 in the operation of the multi-phase extraction system; and S4 is executed after the multiphase extraction is finished, so that relay repair of 'multiphase extraction-enhanced desorption-bioremediation' is realized.
Example 3
If the in-situ low-consumption combined relay repairing device is used for repairing a medium-concentration polluted site, the process in the comparative example 2 is skipped over from the step S1, and S2 and S3 are alternately executed, and S4 is executed after the multiphase extraction is finished.
If it is aimed at repairing a low concentration contaminated site, the procedure in comparative example 2 skips steps S1, S2, S3 and executes S4 directly.
In example 3, only the initial force point of repair was changed, and S2, S3, S4 were the same as those in example 2.
The method for remedying the soil and underground water pollution by using the in-situ low-consumption combined relay remediation device provided by the invention utilizes the multiphase extraction-enhanced desorption-bioremediation in-situ low-consumption combined relay remediation technology, and can establish green low-consumption combined remediation technical equipment suitable for petrochemical enterprises in the Yangtze river economic zone aiming at the characteristics of high-medium-low concentration of pollutants in petrochemical fields.
The invention can utilize different functions and optimal working intervals of each system, sequentially start different system combinations in the equipment, sequentially carry out a combined relay restoration mode of multiphase extraction-enhanced desorption-bioremediation on high-concentration organic polluted soil and underground water, and realize the targeted relay restoration of the characteristics of high-medium-low concentration of underground pollutants in the field step by step; or one or more system combinations in the integrated equipment are started to repair the pollution according to the requirements aiming at the specific pollution conditions in different organic pollution sites, the use method of the equipment is flexible and changeable, and the multiple purposes of one machine can be realized.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. A method for remediating soil and underground water pollution by using an in-situ low-consumption combined relay remediation device is characterized in that the device adopted in the method comprises a first multi-phase extraction vacuum system, a second multi-phase extraction vacuum system, an activated carbon adsorption system, a gas injection system and a dissolved gas injection system which are integrated on a platform;
the first multiphase extraction vacuum system comprises a steam-water separator, a water ring vacuum pump, a gas-liquid separation tank, a demister and a diaphragm pump;
the second multiphase extraction vacuum system comprises a steam-water separator, a demister, a Roots vacuum pump and a diaphragm pump;
the active carbon adsorption system comprises a carbon adding platform, an active carbon adsorber, an induced draft fan and an exhaust funnel;
the gas injection system comprises an air compressor;
the dissolved air injection system comprises a dosing tank, a dissolved air pump, a large bubble separating tank and a pipe coiling device.
2. The method for remediating soil and groundwater pollution by using the in-situ low-consumption combined relay remediation device as recited in claim 1, wherein in the first and second multi-phase extraction vacuum systems, the steam-water separator is provided with a tank body, a liquid level meter and a compressed air backwashing system are arranged in the tank body, a steam-water inlet is arranged at one side of the tank body, a water outlet is arranged at the lower part of the other side of the tank body, and an exhaust port is arranged at the top of the tank body; the steam-water inlet is connected with a multiphase extraction well group arranged in the polluted production area through a pipeline, a drainage pipeline is arranged at the drainage outlet, and a diaphragm pump is arranged on the drainage pipeline.
3. The method for remediating soil and groundwater pollution by using the in-situ low-consumption combined relay remediation device as recited in claim 2, wherein the diaphragm pump is a pneumatic diaphragm pump and is connected with an air compressor of a gas injection system through a pipeline.
4. The method for remediating soil and groundwater pollution by using the in-situ low-consumption combined relay remediation device as recited in claim 2, wherein in the first and second multi-phase extraction vacuum systems, the demister is composed of wave-shaped blades, plates, and a fixed structure including clamping strips.
5. The method for remediating soil and groundwater pollution by using the in-situ low-consumption combined relay remediation device as recited in claim 4, wherein the first multiphase extraction vacuum system is a water ring vacuum pump multiphase extraction system and is provided with a first diaphragm pump and a first demister; an exhaust port of a steam-water separator in the system is connected with one side of a water ring vacuum pump through a pipeline, and the other side of the water ring vacuum pump is respectively connected with one side of a gas-liquid separation tank through two pipelines to form a circulation loop; the gas-liquid separation jar is equipped with the cuboid box that carbon steel anticorrosive material made, and the box top is equipped with first defroster, and the other end of first defroster is equipped with the pipeline and connects gradually active carbon adsorption ware, draught fan and the aiutage of active carbon adsorption system.
6. The method for remediating soil and groundwater pollution by using the in-situ low-consumption combined relay remediation device as recited in claim 4, wherein the second multiphase extraction vacuum system is a Roots vacuum pump multiphase extraction system and is provided with a second demister and a second diaphragm pump; the gas vent of catch water is connected with the second defroster in the system, and the other end of second defroster is equipped with the pipeline and connects gradually roots vacuum pump and active carbon adsorption ware, draught fan and aiutage of active carbon adsorption system.
7. The method for remediating soil and groundwater pollution by using the in-situ low-consumption combined relay remediation device as recited in claim 1, wherein in the activated carbon adsorption system, the carbon adding platform is formed by welding steel structure materials and is installed and fixed above the activated carbon adsorber; granular activated carbon is arranged in the activated carbon adsorber as a filler; the draught fan is internally provided with an impeller, negative pressure is generated through rotation, waste gas is pumped out of the pipeline and is discharged in the high altitude through the exhaust funnel after being purified.
8. The method for remediating soil and groundwater pollution by using the in-situ low-consumption combined relay remediation device as recited in claim 1, wherein in the gas injection system, an air compressor generates compressed air with a pressure of 0.6-0.8MPa and injects the compressed air into the ground, and the compressed air is supplied to a pneumatic diaphragm pump as power.
9. The method for remediating soil and groundwater pollution by using the in-situ low-consumption combined relay remediation device as recited in claim 1, wherein in the dissolved air injection system, the dosing tank is provided with a cylindrical tank body made of polyethylene material, the top of the tank body is provided with a solid/liquid medicament dosing opening, and is provided with a motor and a speed reducer, the tank body is internally provided with a stirring paddle connected with the speed reducer, and the bottom of the tank body is provided with a medicament outlet and a valve; the medicament outlet is connected with the dissolved air pump through a medicament delivery pipe; the dissolved air pump is connected with the large bubble separation tank through a pipeline, the outlet of the large bubble separation tank is provided with the pipeline, and the other end of the pipeline is provided with an injection hose which is used as a medicament injection end; the dissolved air pump sucks in gas, then the gas is pressurized by the pump body to form small bubbles which are fully mixed with the liquid medicament and released by the injection end to generate micro bubbles; the pipe coiling device is used for quickly coiling an injection hose and is made of stainless steel materials.
10. The method for remediating the soil groundwater pollution by using the in-situ low-consumption combined relay remediation device as recited in any one of claims 1 to 9, wherein the method comprises the following steps:
s1, running period A of the multiphase extraction system: starting a first multiphase extraction vacuum system, namely a water ring vacuum pump multiphase extraction system, and pumping a single liquid phase or a gas-liquid mixture mainly comprising the liquid phase out of the ground to reduce the load of underground pollutants;
s2, and the running period B of the multiphase extraction system: closing the water ring vacuum pump multiphase extraction system, starting a second multiphase extraction vacuum system, namely a Roots vacuum pump multiphase extraction system, and pumping a gas-water mixture or single soil gas mainly comprising a gas phase from the underground to further reduce the load of underground pollutants;
s3, strengthening the desorption period: for organic pollutants in the aeration zone soil, compressed air is injected into the aeration zone by an air compressor to reduce the partial pressure of gas-phase pollutants, and meanwhile, desorption and extraction of the organic pollutants are assisted by flow increase, so that the removal effect of the pollutants is enhanced; for organic pollutants in soil and underground water in a saturated zone, a dissolved gas injection system is used for injecting dissolved gas water into the saturated zone, and the concentration of the pollutants in a water phase, particularly non-gravity water, is reduced, the partial pressure of the pollutants in the soil gas in the aeration zone is reduced, the desorption, diffusion and extraction of the pollutants are promoted, and the removal effect of the pollutants is enhanced by combining pumping and injection;
s4, bioremediation: selecting proper strains, nutrients, pH regulators and gas according to the types of underground pollutants, and injecting the selected bacteria, nutrients, pH regulators and gas into the ground by using a dissolved gas injection system to carry out in-situ microbial remediation so as to ensure that the remediation target is achieved;
s5, for a high-concentration pollution scene, sequentially executing S1 and S2 at the initial stage of multiphase extraction operation; synchronously or alternatively executing S1 and S2 or S3 in the middle and later stages of the multiphase extraction operation; after the multiphase extraction is finished, S4 is executed to realize the multiphase extraction, the enhanced desorption and the bioremediation relay repair; and for the medium-low concentration pollution scene, directly starting to repair from a certain link in the middle.
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