CN113290033A - Method for strengthening remediation of soil and underground water by in-situ injection of microbubble generation device - Google Patents
Method for strengthening remediation of soil and underground water by in-situ injection of microbubble generation device Download PDFInfo
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- CN113290033A CN113290033A CN202110675307.1A CN202110675307A CN113290033A CN 113290033 A CN113290033 A CN 113290033A CN 202110675307 A CN202110675307 A CN 202110675307A CN 113290033 A CN113290033 A CN 113290033A
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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
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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 and repairing soil underground water by using in-situ injection of a microbubble generation device, which is carried out by the microbubble generation device. The method comprises the following steps: step 1, adding clear water and/or a medicament into a medicine dissolving tank, and starting a stirrer to prepare a repairing medicament; step 2, simultaneously inhaling gas and the prepared medicament by using a micro-bubble generating device, and pressurizing in a pump to produce micro-bubbles; step 3, injecting the microbubble dissolved gas medicament into the polluted soil groundwater environment through an injection well group through a pipeline; step 4, after the micro bubbles in the step 3 enter the ground, slowly releasing the micro bubbles and gradually floating up; and 5, repeating the step 3 until all the areas of the designed injection points complete the injection of the medicament. The method provided by the invention utilizes microbubble dissolved gas water or dissolved gas medicament formed by a microbubble generating device to inject into the polluted soil groundwater environment through an in-situ injection technology, thereby realizing the reinforced removal of the underground pollutants.
Description
Technical Field
The invention relates to a method for repairing soil groundwater in the technical field of environmental protection, in particular to a method for strengthening and repairing polluted soil groundwater by combining a microbubble generating device with an in-situ injection technology.
Background
With the promotion of the urbanization process and the adjustment of the industrial structure, the industrial enterprises of pesticide, chemical industry and the like in large and medium-sized cities gradually stop or move away from the urban area, and meanwhile, a large amount of polluted sites are left for carrying out the soil and underground water remediation work.
The in-situ injection remediation of the soil and the underground water is to inject gaseous or liquid remediation agents into the polluted area of the soil or the underground water, and to convert pollutants in the soil or the underground water into substances which are nontoxic or have relatively low toxicity under the action of the agents, so that the remediation purpose is realized, and the in-situ injection remediation method is mainly suitable for polluted sites which are difficult to excavate and have more structures. In situ remediation agent injection is typically performed by injection well injection or by direct push injection via an injection rod. The injection well type injection directly injects the repairing agent into a pre-established injection well, and utilizes stratum fractures and underground water to flow and convey the repairing agent. The injection rod direct-push type injection is that after the injection rod with an injection head is pressed down to a target stratum, the peripheral stratum is split through high pressure to form a local fracture for quickly conveying the medicament, meanwhile, the dispersed medicament can further diffuse through the flow of underground water, and the injected medicament can be contacted with pollutants within a certain range. Injection wells are typically used when the contaminated land formation has little heterogeneity or when a remediation agent with a lower viscosity is injected.
However, the traditional in-situ gas medicament injection method has the problems of large diameter of injection bubbles, small injection influence radius and low utilization rate of effective ingredients of gas; the traditional liquid medicament injection method has the problems of poor underground disturbance degree in the repairing process, slow migration and diffusion speed of the medicament in soil groundwater environment, difficulty in desorption of pollutants from the surface of soil particles, difficulty in effective contact with the repairing medicament and the like, and the overall repairing efficiency is poor.
Therefore, in order to overcome the limitations of the conventional injection repair method in the field repair, it is necessary to develop a novel injection method that can be applied to the field repair, and solve the problems associated with the prior injection technology.
Disclosure of Invention
The invention aims to provide a method for restoring soil underground water, which utilizes a microbubble generation device to combine with an in-situ injection technology to strengthen the restoration of the polluted soil underground water, combines the microbubble technology with the in-situ injection technology, and can exert high-efficiency in-situ injection restoration effect under relatively low medicament injection concentration.
In order to achieve the above object, the present invention provides a method for in-situ injection enhanced remediation of soil groundwater using a microbubble generator, wherein the method is performed by the microbubble generator; the micro-bubble generating device comprises a medicine dissolving tank, a gas-liquid mixing pump, an injection well group, a pipeline and a valve; a stirrer is arranged in the medicine dissolving tank, the top of the medicine dissolving tank is provided with a medicine adding port, and the lower part of the medicine dissolving tank is provided with a medicine liquid outlet; the injection well group comprises a plurality of injection wells vertically inserted into the polluted soil, the top of each injection well is connected with a liquid medicine outlet of the medicine dissolving tank through a pipeline, and a gas-liquid mixing pump is arranged in the middle of each pipeline.
The method for in-situ injection and reinforced remediation of soil groundwater by using the microbubble generation device comprises the following steps: step 1, adding clear water and/or a medicament into a medicament dissolving tank, and starting a stirrer to prepare a repairing medicament; step 2, simultaneously sucking gas and the medicament prepared in the step 1 by using a micro-bubble generating device, and pressurizing in a gas-liquid mixing pump to produce micro-bubbles; step 3, injecting the microbubble dissolved gas medicament generated in the step 2 into the polluted soil groundwater environment through an injection well group through a pipeline by using a microbubble generating device; step 4, after the micro bubbles in the step 3 enter the ground, slowly releasing the micro bubbles and gradually floating up; and 5, repeating the step 3 until all the areas of the designed injection points complete the injection of the medicament.
In the above method for in-situ injection enhanced remediation of soil groundwater by using the microbubble generator, in step 1, the prepared remediation agent contains any one or a combination of more than one of an oxidant, a reducing agent, an activator, a regulator, a microbial nutrient or a microbial strain according to different soil groundwater pollutants.
In the method for strengthening remediation of soil groundwater by using in-situ injection of the microbubble generation device, when the oxidant in the remediation agent is sodium persulfate, the mass concentration of the oxidant is controlled to be 0.5-5%; when the activating agent is ferrous sulfate, the mass concentration of the activating agent is controlled to be 0.25-5%; when the pH regulator adopts sodium hydroxide, the pH is controlled to be 9-11; when the reducing agent is zero-valent iron, the mass concentration of the reducing agent is controlled to be 0.5-5%.
In the method for strengthening remediation of soil groundwater by using in-situ injection of the microbubble generation device, when the remediation agent adopts a reducing agent or an anaerobic strain, the inhaled gas is a reducing or inert gas containing methane gas or nitrogen gas; when the repairing agent adopts oxidant or aerobic bacteria, the inhaled gas is selected to be air or oxygen.
In the method for in-situ injection reinforced remediation of soil groundwater by using the microbubble generation device, in the step 2, the gas suction amount is 8-10% by volume percentage.
The method for strengthening and repairing the soil groundwater by using the in-situ injection of the microbubble generating device comprises the steps that the pipeline comprises a main pipeline connected with a liquid medicine outlet, a plurality of branch pipelines connected in parallel are arranged at the other end of the main pipeline, and one branch pipeline is connected with the top of one injection well; a gas-liquid mixing pump is arranged on the main pipeline, a first valve is arranged on the main pipeline between the gas-liquid mixing pump and the medicine dissolving tank, and a second valve is arranged on the main pipeline between the gas-liquid mixing pump and the branch pipeline; a pressure gauge is arranged on the main pipeline between the second valve and the branch pipeline; and each branch pipeline is respectively provided with a third valve.
In the method for strengthening the remediation of the soil and the underground water by using the in-situ injection of the microbubble generator, the gas-liquid mixing pump adopts a corrosion-resistant self-suction type gas-liquid mixing vortex pump.
In the method for strengthening the remediation of the soil and the underground water by using the in-situ injection of the microbubble generation device, gas is introduced into the gas-liquid mixing pump, meanwhile, the liquid medicine in the medicine dissolving tank enters the gas-liquid mixing pump through the main pipeline, and the gas is pressurized and dissolved by the gas-liquid mixing pump to generate microbubbles in the liquid medicine; the size range of the microbubbles is 20 μm to 30 μm.
In the method for in-situ injection reinforced remediation of soil groundwater by using the microbubble generation device, the injection well is of a vertically downward cylindrical structure, and the bottom end of the injection well is inserted into the polluted soil groundwater environment to form an outlet; the wall of the injection well is filled with quartz sand from bottom to top, and the upper part of the quartz sand is filled with bentonite to the ground.
The method for strengthening and repairing the soil groundwater by using the microbubble generation device through in-situ injection provided by the invention has the following advantages:
(1) the invention can greatly improve the influence radius of gas injection and improve the utilization rate of effective components of gas underground.
(2) The method can obviously shorten the soil groundwater remediation time, improve the contact reaction efficiency of the chemical agent and the pollutants by strengthening the desorption of the pollutants from the surface of the soil particles and the migration of the pollutants to the free flowing groundwater phase, reduce the using amount of the remediation agent and efficiently remove the soil groundwater pollutants.
(3) The method is flexible and changeable, and can be suitable for multi-point soil groundwater remediation under various application scene conditions.
Drawings
FIG. 1 is a schematic structural diagram of the apparatus for in-situ injection enhanced remediation of soil groundwater using a microbubble generation device in accordance with the present invention.
Wherein: 1. a medicine dissolving tank; 2. a gas-liquid mixing pump; 3. a stirrer; 4. a medicament addition port; 5. a liquid medicine outlet; 6. an injection well; 7. a main pipeline; 8. a branch line; 9. a first valve; 10. a second valve; 11. a pressure gauge; 12. a third valve; 13. quartz sand; 14. bentonite; 15. a stirring rod; 16. a paddle; 17. an electric motor.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
As shown in figure 1, the method for strengthening and restoring the soil groundwater by using the microbubble generator in-situ injection is carried out by the microbubble generator.
The microbubble generating device comprises a medicine dissolving tank 1, a gas-liquid mixing pump 2, an injection well group, a pipeline and a valve; a stirrer 3 is arranged in the medicine dissolving tank 1, a medicine adding port 4 is arranged at the top, and a medicine liquid outlet 5 is arranged at the lower part.
The medicine dissolving tank 1 is a vertical closed hollow tank body. The main part of agitator 3 is equipped with puddler 15 and paddle 16, inserts by the top center of dissolving medicine jar 1 and dissolves medicine jar 1 in until being close dissolving medicine jar 1 bottom, and the main part top of agitator 3 lies in the part outside dissolving medicine jar 1 top surface and is equipped with motor 17, stirs the liquid medicine in dissolving medicine jar 1 through drive puddler 15 and paddle 16 rotation.
The injection well group comprises a plurality of injection wells 6 vertically inserted into the polluted soil, the top of each injection well 6 is connected with a liquid medicine outlet 5 of the liquid medicine tank 1 through a pipeline, and a gas-liquid mixing pump 2 is arranged in the middle of each pipeline.
The method comprises the following steps: step 1, adding a certain amount of clear water and/or medicament into a medicament dissolving tank 1, and starting a stirrer 3 to prepare a repairing medicament; step 2, simultaneously sucking a certain amount of gas and the medicament prepared in the step 1 by using a micro-bubble generating device, and pressurizing in a gas-liquid mixing pump 2 to produce micro-bubbles to obtain a micro-bubble gas-dissolving medicament; step 3, injecting the microbubble dissolved gas medicament generated in the step 2 into the polluted soil groundwater environment through an injection well group through a pipeline by using a microbubble generating device; step 4, after the micro bubbles in the step 3 enter the ground, slowly releasing the micro bubbles and gradually floating up; in the process, the washing, shearing and lifting actions of the bubbles promote the pollutants to be diffused or resolved from the surface of the soil particles into the underground water, the desorption of the pollutants is enhanced, the movement of the bubbles helps the agents to be diffused and migrated and fully mixed with the pollutants in the soil and the underground water, the utilization efficiency of the agents is improved, and meanwhile, the effective components in the gas can be dissolved into the underground water to realize the restoration action; and 5, repeating the step 3 until all the areas of the designed injection points complete the injection of the medicament.
Preferably, the remediation agent formulated in step 1 may comprise any one or a combination of more of an oxidizing agent, a reducing agent, an activating agent, a regulating agent, a microbial nutrient or a microbial species, etc., depending on the soil groundwater contaminants.
When the oxidant in the repairing agent is sodium persulfate, the mass concentration of the oxidant is controlled to be 0.5-5%; when the activating agent is ferrous sulfate, the mass concentration of the activating agent is controlled to be 0.25-5%; when the pH regulator adopts sodium hydroxide, the pH is controlled to be 9-11; when the reducing agent is zero-valent iron, the mass concentration of the reducing agent is controlled to be 0.5-5%.
When the repairing agent adopts a reducing agent or anaerobic bacteria, the inhaled gas is selected to be reductive or inert gas containing methane gas or nitrogen gas and the like; when the repairing agent adopts oxidant or aerobic bacteria, the inhaled gas is selected from air or oxygen. The remediation agent can also be only clear water, and the gas type is determined according to the remediation process and the type of underground pollutants.
In the step 2, the suction amount of the gas is 8-10% of the total flow of the gas and the liquid according to the volume percentage.
The pipeline comprises a main pipeline 7 connected with the liquid medicine outlet 5, the other end of the main pipeline 7 is provided with a plurality of branch pipelines 8 which are connected in parallel, and one branch pipeline 8 is connected with the top of one injection well 6. The main pipeline 7 is provided with a gas-liquid mixing pump 2, the main pipeline 7 between the gas-liquid mixing pump 2 and the medicine dissolving tank 1 is provided with a first valve 9, and the main pipeline 7 between the gas-liquid mixing pump 2 and the branch pipeline 8 is provided with a second valve 10. A pressure gauge 11 is arranged on the main pipe 7 between the second valve 10 and the branch pipe 8. Each branch pipeline 8 is provided with a third valve 12.
The gas-liquid mixing pump 2 is a corrosion-resistant self-suction gas-liquid mixing vortex pump.
Gas is introduced into the gas-liquid mixing pump 2, meanwhile, liquid medicine in the medicine dissolving tank 1 enters the gas-liquid mixing pump 2 through the main pipeline 7, and micro bubbles are generated in the liquid medicine through the gas-liquid mixing pump 2 by adopting a pressurizing and gas dissolving principle. The size range of the micro-bubbles is controlled to be about 20-30 μm.
The injection well group consists of a plurality of injection wells 6 which are uniformly arranged in parallel in the polluted site.
The injection well 6 is a vertically downward cylindrical structure, and the bottom end of the injection well is inserted into the polluted soil groundwater environment to form an outlet. The wall of the injection well 6 is filled with quartz sand 13 from bottom to top, and the upper part of the quartz sand 13 is filled with bentonite 14 to the ground.
The method for in-situ injection enhanced remediation of soil groundwater provided by the invention by using the microbubble generation device is further described below with reference to the embodiment.
Example 1
A method for strengthening and repairing soil underground water by using microbubble generation device in-situ injection is carried out by the microbubble generation device.
The microbubble generating device comprises a medicine dissolving tank 1, a gas-liquid mixing pump 2, an injection well group, a pipeline and a valve.
A stirrer 3 is arranged in the medicine dissolving tank 1, a medicine adding port 4 is arranged at the top, and a medicine liquid outlet 5 is arranged at the lower part.
The injection well group comprises a plurality of injection wells 6 vertically inserted into the polluted soil, the top of each injection well 6 is connected with a liquid medicine outlet 5 of the liquid medicine tank 1 through a pipeline, and a gas-liquid mixing pump 2 is arranged in the middle of each pipeline. The injection well 6 is a vertically downward cylindrical structure, and the bottom end of the injection well is inserted into the polluted soil groundwater environment to form an outlet. The wall of the injection well 6 is filled with quartz sand 13 from bottom to top, and the upper part of the quartz sand 13 is filled with bentonite 14 to the ground.
The pipeline comprises a main pipeline 7 connected with the liquid medicine outlet 5, the other end of the main pipeline 7 is provided with a plurality of branch pipelines 8 which are connected in parallel, and one branch pipeline 8 is connected with the top of one injection well 6.
The main pipeline 7 is provided with a gas-liquid mixing pump 2, the main pipeline 7 between the gas-liquid mixing pump 2 and the medicine dissolving tank 1 is provided with a first valve 9, and the main pipeline 7 between the gas-liquid mixing pump 2 and the branch pipeline 8 is provided with a second valve 10. A pressure gauge 11 is arranged on the main pipe 7 between the second valve 10 and the branch pipe 8. Each branch pipeline 8 in the pipeline is provided with a third valve 12.
The gas-liquid mixing pump 2 is a corrosion-resistant self-suction gas-liquid mixing vortex pump. Gas is introduced into the gas-liquid mixing pump 2, meanwhile, the liquid medicine in the medicine dissolving tank 1 enters the gas-liquid mixing pump 2 through the main pipeline 7, and the gas is pressurized and dissolved through the gas-liquid mixing pump 2, so that micro bubbles are generated in the liquid medicine. The size range of the microbubbles is 20 μm to 30 μm.
Example 2
A method for strengthening and restoring soil groundwater by using microbubble generation device in-situ injection comprises the following process flows:
step 1, adding required amount of clear water and medicament into the medicament dissolving tank 1, and starting the stirrer 3 to prepare the repairing medicament.
The remediation agent may include an oxidizing agent, a reducing agent, an activating agent, a conditioning agent, a microbial nutrient or microbial species, etc., depending on the soil groundwater contaminant.
Preferably, the chemical agent is sodium persulfate which is an oxidation type chemical agent and has the mass concentration of 5 percent; the pH regulator adopts sodium hydroxide and has a pH value of 11.
And 2, sucking the medicament and the gas prepared in the step 1 by using a micro-bubble generating device and pressurizing in a gas-liquid mixing pump 2 to produce micro-bubbles.
The gas-liquid mixing pump 2 is an anti-corrosion self-suction gas-liquid mixing vortex pump, and adopts a pressurizing and gas dissolving principle, wherein the size range of micro bubbles is 20-30 mu m; the intake of gas was 10% of the liquid flow by volume percent.
The medicament is an oxidizing medicament, and the gas sucked by the gas-liquid mixing pump 2 generating vortex selects common air, and the gas flow is about 1-1.5L/min.
And 3, injecting the mixed microbubble agent generated in the step 2 into the polluted soil groundwater environment through a pipeline by using a microbubble generation device.
And 4, after the medicament mixed with the microbubbles in the step 3 enters the ground, the microbubbles are slowly released to gradually form larger bubbles to float upwards.
In the process, the shearing and lifting of the bubbles promote the migration and diffusion of pollutants from the surface of the soil particles to the underground water, the desorption of the pollutants is strengthened, the movement of the bubbles helps the further mixing of the medicament and the pollutants in the soil and the underground water, and the utilization efficiency of the medicament is improved.
And 5, repeating the step 3 until all the areas for designing the injection points complete the injection of the medicament.
Example 3
A method for strengthening and repairing soil and underground water by using in-situ injection of a microbubble generation device is characterized in that a certain amount of clear water and a certain amount of medicament are added into a medicament dissolving tank 1, a stirrer 3 is started to prepare the repairing medicament, and the chemical medicament is reduced medicament zero-valent iron with the mass concentration controlled at 0.5%. The prepared medicament and a certain amount of gas are sucked by a micro-bubble generating device, and micro-bubbles are produced by pressurizing in a gas-liquid mixing pump 2; the gas-liquid mixing pump 2 is an anti-corrosion self-suction gas-liquid mixing vortex pump, and adopts a pressurizing and gas dissolving principle, wherein the size range of micro bubbles is 20-30 mu m; the intake of gas was 8% of the liquid flow by volume percentage. The gas sucked by the gas-liquid mixing vortex pump is common inert gas nitrogen, and the gas flow is about 1-1.5L/min. The rest of the procedure was the same as in example 2.
Example 4
A method for strengthening remediation of soil and underground water by in-situ injection of a microbubble generation device is characterized in that a certain amount of clear water and a certain amount of medicament are added into a medicament dissolving tank 1, a stirrer 3 is started to prepare the remediation medicament, and the remediation medicament is selected from aerobic biological agents. The micro-bubble generating device is used for sucking the prepared medicament and a certain amount of gas and pressurizing the medicament and the gas in the gas-liquid mixing pump 2 to produce micro-bubbles; the gas-liquid mixing pump 2 is an anti-corrosion self-suction gas-liquid mixing vortex pump, and adopts a pressurizing and gas dissolving principle, wherein the size range of micro bubbles is 20-30 mu m; the intake of gas was 8% of the liquid flow by volume percentage. The gas-liquid mixing vortex pump sucks gas and selects oxygen, and the gas flow is about 1-1.5L/min. The rest of the procedure was the same as in example 2.
In the embodiments of the present invention, the micro bubble generation device and the in-situ injection are combined to repair soil and groundwater intensively, which can be used for repairing and treating target pollutants such as Volatile Organic Compounds (VOCs), Semi-Volatile Organic Compounds (SVOCs), Total Petroleum Hydrocarbons (TPH), and the like in soil and groundwater of an Organic contaminated site. The characteristics of stable microbubble colloid, large specific surface area, high mass transfer and the like are utilized to enhance the contact of the repairing medicament and pollutants in soil and underground water, accelerate mass transfer from gas phase to liquid phase and reduce the consumption of the medicament. Meanwhile, the high interface charge of the microbubbles and shock waves generated by collapse of the microbubbles can promote the rapid transfer of underground pollutants from a solid-liquid interface to a liquid phase, so that the underground pollutants are more beneficial to contact reaction with a repairing medicament.
Thus, the features of the present invention can be summarized as follows: 1) the microbubble specific surface area is big, and under the unchangeable condition of total volume, the total surface area of bubble is in inverse proportion with the diameter of single bubble, and the microbubble can have better mass transfer efficiency, the utilization ratio of high gas active ingredient underground. 2) The hydraulic gradient of underground water in a local area can be improved through flow increasing and pressurization, the migration and diffusion of dissolved air medicaments or dissolved air water in the underground along the horizontal direction are assisted, the migration and diffusion of air flow from an injection point to the periphery are assisted by means of water flow, the mixing of medicaments is assisted, the influence radius of medicament injection is improved, and in the process, a part of non-flowing water phase can be converted into a flowing water phase under the flushing of the dissolved air medicaments or the dissolved air water so as to utilize the contact reaction of pollutants in the water phase and the medicaments; 3) after the gas dissolving medicament or the gas dissolving water enters the ground, the micro bubbles are slowly released and float upwards; in the process, the interface of the non-flowing water phase can be damaged by the washing, shearing and lifting actions of the micro-bubbles, the non-flowing water phase on the surface of the soil particles can be further promoted to be converted into the flowing water phase, and meanwhile, the micro-bubbles are in contact permeation with the non-flowing water phase, so that the repairing agent and the non-flowing water can be mixed together, and the using efficiency of the agent is improved.
The method for strengthening and repairing the soil underground water by using the microbubble generator in situ injection provided by the invention has the advantages that microbubble dissolved gas water or dissolved gas medicament formed by microbubble generation is injected into the polluted soil underground water environment through the in situ injection technology, so that the strengthened removal of underground pollutants is realized. Compared with the traditional in-situ injection technology, the gas injection device can solve the problems of large diameter of gas injection bubbles, small injection influence radius and low utilization rate of gas components; and the problems that the underground disturbance degree is poor, the migration and diffusion speed of the medicament in the soil groundwater environment is slow, the pollutants are difficult to desorb from the surface of soil particles and difficult to effectively contact with the remediation medicament in the liquid injection remediation process can be solved.
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 strengthening and repairing soil groundwater by using microbubble generator in-situ injection is characterized in that the method is carried out by the microbubble generator;
the micro-bubble generating device comprises a medicine dissolving tank, a gas-liquid mixing pump, an injection well group, a pipeline and a valve; a stirrer is arranged in the medicine dissolving tank, the top of the medicine dissolving tank is provided with a medicine adding port, and the lower part of the medicine dissolving tank is provided with a medicine liquid outlet; the injection well group comprises a plurality of injection wells vertically inserted into the polluted soil, the top of each injection well is connected with a liquid medicine outlet of the medicine dissolving tank through a pipeline, and a gas-liquid mixing pump is arranged in the middle of each pipeline.
2. The method for in-situ injection enhanced remediation of soil groundwater using microbubble generation device as claimed in claim 1, wherein the method comprises:
step 1, adding clear water and/or a medicament into a medicament dissolving tank, and starting a stirrer to prepare a repairing medicament;
step 2, simultaneously sucking gas and the medicament prepared in the step 1 by using a micro-bubble generating device, and pressurizing in a gas-liquid mixing pump to produce micro-bubbles;
step 3, injecting the microbubble dissolved gas medicament generated in the step 2 into the polluted soil groundwater environment through an injection well group through a pipeline by using a microbubble generating device;
step 4, after the micro bubbles in the step 3 enter the ground, slowly releasing the micro bubbles and gradually floating up;
and 5, repeating the step 3 until all the areas of the designed injection points complete the injection of the medicament.
3. The method for in-situ injection enhanced remediation of soil groundwater according to claim 2, wherein the remediation agent prepared in step 1 comprises any one or more of an oxidant, a reductant, an activator, a regulator, a microbial nutrient or a microbial species, depending on the soil groundwater pollutants.
4. The method for in-situ injection reinforced remediation of soil groundwater by using a microbubble generator as claimed in claim 3, wherein in the remediation agent, when sodium persulfate is used as the oxidant, the mass concentration of the sodium persulfate is controlled to be in the range of 0.5-5%; when the activating agent is ferrous sulfate, the mass concentration of the activating agent is controlled to be 0.25-5%; when the pH regulator adopts sodium hydroxide, the pH is controlled to be 9-11; when the reducing agent is zero-valent iron, the mass concentration of the reducing agent is controlled to be 0.5-5%.
5. The method for in-situ injection enhanced remediation of soil groundwater using a microbubble generator as claimed in claim 3, wherein when the remediation agent employs a reducing agent or an anaerobic species, the inhaled gas is selected from a reducing or inert gas comprising methane gas or nitrogen gas; when the repairing agent adopts oxidant or aerobic bacteria, the inhaled gas is selected to be air or oxygen.
6. The method for in-situ injection enhanced remediation of soil groundwater using a microbubble generator as claimed in claim 2, wherein in the step 2, the gas is inhaled in an amount of 8-10% by volume.
7. The method for in-situ injection enhanced remediation of soil groundwater using a microbubble generator as claimed in claim 1, wherein the pipeline comprises a main pipeline connected to the liquid medicine outlet, the other end of the main pipeline is provided with a plurality of branch pipelines connected in parallel, one branch pipeline is connected to the top of one injection well; a gas-liquid mixing pump is arranged on the main pipeline, a first valve is arranged on the main pipeline between the gas-liquid mixing pump and the medicine dissolving tank, and a second valve is arranged on the main pipeline between the gas-liquid mixing pump and the branch pipeline; a pressure gauge is arranged on the main pipeline between the second valve and the branch pipeline; and each branch pipeline is respectively provided with a third valve.
8. The method for in-situ injection enhanced remediation of soil groundwater as claimed in claim 7, wherein the gas-liquid mixing pump is a corrosion-resistant self-priming gas-liquid mixing vortex pump.
9. The method for in-situ injection enhanced remediation of soil groundwater with a microbubble generation device as claimed in claim 8, wherein the gas is introduced into the gas-liquid mixing pump, and the liquid medicine in the medicine dissolving tank enters the gas-liquid mixing pump through the main pipeline, and is pressurized and dissolved by the gas-liquid mixing pump to generate microbubbles in the liquid medicine; the size range of the microbubbles is 20 μm to 30 μm.
10. The method for in-situ injection enhanced remediation of soil groundwater using a microbubble generator as claimed in claim 7, wherein the injection well is a vertically downward cylindrical structure, and the bottom end of the injection well is inserted into the polluted soil groundwater environment to form an outlet; the wall of the injection well is filled with quartz sand from bottom to top, and the upper part of the quartz sand is filled with bentonite to the ground.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114453412A (en) * | 2022-02-11 | 2022-05-10 | 江苏开放大学（江苏城市职业学院） | Soil pollution remediation and chemical adding system and method |
| CN115446099A (en) * | 2022-08-16 | 2022-12-09 | 东华大学 | Method for removing polycyclic aromatic hydrocarbons and heavy metals in soil through microbubble enhanced washing |
-
2021
- 2021-06-17 CN CN202110675307.1A patent/CN113290033A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114453412A (en) * | 2022-02-11 | 2022-05-10 | 江苏开放大学（江苏城市职业学院） | Soil pollution remediation and chemical adding system and method |
| CN115446099A (en) * | 2022-08-16 | 2022-12-09 | 东华大学 | Method for removing polycyclic aromatic hydrocarbons and heavy metals in soil through microbubble enhanced washing |
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Address after: 200001 floor 26, Gangtai Plaza, 700 Yan'an East Road, Huangpu District, Shanghai Applicant after: SHANGHAI GREENMENT ENVIRONMENTAL TECHNOLOGIES CO. L Address before: 200083 Room 203, building 5, No. 500, Memorial Road, Hongkou District, Shanghai Applicant before: SHANGHAI GREENMENT ENVIRONMENTAL TECHNOLOGIES CO. L |
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Application publication date: 20210824 |