CN115417509A - System and method for in-situ treatment of old pit water in coal mine goaf by sulfate reducing bacteria - Google Patents
System and method for in-situ treatment of old pit water in coal mine goaf by sulfate reducing bacteria Download PDFInfo
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- CN115417509A CN115417509A CN202211136403.XA CN202211136403A CN115417509A CN 115417509 A CN115417509 A CN 115417509A CN 202211136403 A CN202211136403 A CN 202211136403A CN 115417509 A CN115417509 A CN 115417509A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/345—Biological treatment of water, waste water, or sewage characterised by the microorganisms used for biological oxidation or reduction of sulfur compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a system and a method for in-situ treatment of coal mine goaf laojiao water by sulfate reducing bacteria.
Description
Technical Field
The invention belongs to the technical field of groundwater pollution remediation, and particularly relates to a system and a method for in-situ treatment of old pit water in a coal mine goaf by using sulfate reducing bacteria.
Background
Coal generally contains about 0.3% to 5% sulfur, and is mainly present as pyrite, accounting for about 2/3 of the sulfur content of coal. The coal mine damages the environment of the coal bed in the excavation process, the original environment is changed into an oxidation environment, pyrite is contacted with underground water and air, sulfuric acid and ferric hydroxide are generated through a series of reactions such as oxidation, hydrolysis and microorganisms, but after the mine is closed, water is not drained any more, a large number of goafs are left, the coal bed continuously reacts with the underground water, a large number of aged cellar water with high hardness, high mineralization degree, high sulfate and strong acidity is gradually formed, and a large number of toxic and harmful metals such as iron and manganese are dissolved. Along with the increase of time, old kiln water is constantly gathered, and the water level is raised, finally leads to old kiln water to flow along the structure weak area or some pressure release passageways everywhere, finally leads to the pollution of peripheral groundwater, surface water.
At present, mine acid underground water is treated mainly passively, namely, an osmotic reaction grid (PRB) is adopted in the underground water seepage process or the acid underground water is treated after a surface water sump is formed after the underground water is exposed, and the treatment mode is difficult to treat from the source. The treatment of the Permeable Reactive Barrier (PRB) requires construction of a PRB reactive wall, and frequent replacement and maintenance of a reactive wall filter material for a long time, and has the problems of high construction cost, long operation time, high maintenance cost and the like; the exposed acidic underground water is treated by adopting integrated treatment equipment or a newly-built sewage treatment station, and the problems of high construction cost, long operation time, high maintenance cost and the like also exist.
Disclosure of Invention
Therefore, the invention aims to solve the problem that secondary pollution exists in the process that mine acidic groundwater cannot be treated from the source by adopting a Permeable Reactive Barrier (PRB) or groundwater treatment equipment.
In order to realize the aim, the invention provides a method for treating aged pit water in a coal mine goaf in situ by using sulfate reducing bacteria, which comprises the following steps:
injecting sulfate reducing bacteria strains into an injection well at the upper part of a coal mine goaf for mixing reaction;
and adding quicklime into an injection well at the upper part of the coal mine goaf after the mixing reaction is finished.
Preferably, in the method for treating the aged pit water in the coal mine goaf in situ by using the sulfate reducing bacteria, before the step of injecting sulfate reducing bacteria strains into the injection well at the upper part of the coal mine goaf for mixed reaction, the method further comprises the following steps:
establishing an injection well at the upper surface of the coal mine goaf, wherein the well depth of the injection well extends to the coal mine goaf.
Preferably, in the method for treating the aged pit water in the coal mine goaf in situ by using the sulfate reducing bacteria, the method further comprises the following steps:
and establishing an upper monitoring well and a lower monitoring well in the coal mine goaf, wherein the upper monitoring well and the lower monitoring well are respectively positioned on the upstream and the downstream of the injection well along the water flow direction.
Preferably, in the method for treating the aged pit water in the coal mine goaf in situ by using the sulfate reducing bacteria, before the step of injecting sulfate reducing bacteria strains into the injection well at the upper part of the coal mine goaf for mixed reaction, the method further comprises the following steps:
collecting acidic aged cellar water in a coal mine, separating and purifying to obtain sulfate reducing bacteria, putting a sterilized Barls culture medium into an anaerobic bottle, adding a 5% filtered and sterilized ammonium ferrous sulfate solution, screening according to the inoculum size of 10% to obtain sulfate reducing bacteria liquid, introducing pure nitrogen into the anaerobic operation box for 5-8 minutes, and then sealing the anaerobic bottle and incubating for 3-5 days at 30 ℃ to obtain enriched sulfate reducing bacteria strains;
the obtained sulfate-enriched reducing bacteria strains are respectively inoculated into fresh culture media containing different sulfate radical mass concentrations according to the inoculation amount of 10 percent and the gradient, the pH is adjusted to be approximately 7.0, and the sulfate radical resistance domestication is carried out by anaerobic culture at the temperature of 30 ℃.
Preferably, in the method for treating the aged pit water in the coal mine goaf in situ by using the sulfate reducing bacteria, the concentration ratio of the quick lime is 5-15%.
Preferably, in the method for treating the aged pit water in the coal mine goaf in situ by using the sulfate reducing bacteria, the adding quicklime to an injection well at the upper part of the coal mine goaf after the mixing reaction is completed comprises:
injecting the quicklime water solution into the goaf aged pit water area gradually through the injection well according to different concentrations by using a high-pressure pump for full reaction;
and sampling and detecting different concentrations in a lower monitoring well according to the corresponding addition completion time to judge whether the reaction is complete.
Preferably, in the method for treating aged pit water in a coal mine goaf in situ by using sulfate reducing bacteria, an injection well is established on the upper surface of the coal mine goaf, wherein the well depth of the injection well extends to the front of the step of coal mine goaf, and the method further comprises the following steps:
and determining the position and the depth of the injection well according to geological and hydrogeological conditions of the coal mine goaf, wherein the geological and hydrogeological conditions of the coal mine goaf comprise one or more of the water quantity of the aged pit, the underground water flow field of the mining area, the chemical environment of underground water and the underground water seepage channel.
Preferably, in the method for treating the aged pit water in the coal mine goaf in situ by using the sulfate reducing bacteria, before the step of injecting sulfate reducing bacteria strains into the injection well at the upper part of the coal mine goaf for mixed reaction, the method further comprises the following steps:
collecting an underground water sample, and detecting the water quality condition of underground water to be used as a water quality contrast value before treatment.
In order to achieve the above object, the present invention further provides a system for in-situ treatment of pit water in a coal mine goaf by using sulfate reducing bacteria, which is applied to the method for in-situ treatment of pit water in a coal mine goaf by using sulfate reducing bacteria, and the method comprises:
a water purifying tank;
the system comprises an injection well module, a monitoring module and a monitoring module, wherein the injection well module is used for establishing an injection well, an upper monitoring well and a lower monitoring well for a coal mine goaf, and the upper monitoring well and the lower monitoring well are respectively positioned on the upstream and the downstream of the injection well along the water flow direction;
a high pressure pump having one end for connection with the injection well;
the strain stirring barrel is connected with one end of the high-pressure pump and is used for stirring sulfate reducing bacteria strains, and the other end of the strain stirring barrel is connected with the water purification tank;
one end of the quicklime stirring barrel is connected with the high-pressure pump, and the other end of the quicklime stirring barrel is connected with the water purifying tank.
Preferably, in the system for treating the aged pit water in the coal mine goaf in situ by using the sulfate reducing bacteria, the high-pressure pump is connected with the injection well through a chemical injection pipe.
The invention has the following beneficial effects:
according to the invention, the acidic aged pit water in the goaf is treated in situ by using sulfate reducing bacteria, the environmental problems of overproof underground water sulfate radicals, overproof heavy metals and the like caused by coal mining are treated from the source, the acidic aged pit water treated by using the sulfate reducing bacteria has no secondary pollution, is safe and reliable, has lower pollutant mobility, reduces pollution diffusion, and improves the pH value of the acidic aged pit water, so that part of heavy metal ions are precipitated, the concentration of heavy metal pollutants is reduced, the purpose of reducing the harm of heavy metals to the environment is achieved, and the problem that secondary pollution exists in the process of treating the acidic underground water in the mine from the source by using a Permeable Reactive Barrier (PRB) or underground water treatment equipment is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following descriptions are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic exploded view of an embodiment of the system for treating aged pit water in a goaf of a coal mine in situ by using sulfate-reducing bacteria according to the present invention.
1-a water purification tank, 2-a high-pressure pump, 3-a strain stirring barrel, 4-a quicklime stirring barrel, 5-an injection pipe, 61-an injection well, 62-an upper monitoring well, 63-a lower monitoring well, 71-a mining area stratum and 72-goaf old cellar water.
The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
In the embodiment of the present invention, the term "and/or" describes an association relationship of an associated object, and indicates that three relationships may exist, for example, a and/or B, and may indicate: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
The term "plurality" in the embodiments of the present invention means two or more, and other terms are similar thereto.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in various embodiments of the invention, numerous technical details are set forth in order to provide a better understanding of the present invention. However, the claimed invention can be practiced without these specific details and with various changes and modifications based on the following examples. The following embodiments are divided for convenience of description, and should not constitute any limitation to the specific implementation manner of the present invention, and the embodiments may be mutually incorporated and referred to without contradiction.
The invention provides a method for in-situ treatment of old pit water in a coal mine goaf by sulfate reducing bacteria, which comprises the following steps:
s100, injecting sulfate reducing bacteria strains into an injection well 61 at the upper part of a coal mine goaf for mixing reaction;
before the step S100, the method further includes:
step S110: an injection well 61 is established on the upper surface of the coal mine goaf, wherein the well depth of the injection well 61 extends to the coal mine goaf.
Before step S110, the method includes:
s111: and determining the position and the depth of the injection well 61 according to geological and hydrogeological conditions of the coal mine goaf, wherein the geological and hydrogeological conditions of the coal mine goaf comprise one or more of the water quantity of the aged pit, the underground water flow field of the mining area, the chemical environment of underground water and an underground water seepage channel.
In addition, an upper monitoring well 62 and a lower monitoring well 63 are established in the coal mine goaf, wherein the upper monitoring well 62 and the lower monitoring well 63 are respectively positioned on the upstream and downstream of the injection well 61 along the water flow direction.
Before the step S100, the method further includes:
step S120: collecting acidic aged cellar water in a coal mine, separating and purifying to obtain sulfate reducing bacteria, putting a sterilized Barls' culture medium into an anaerobic bottle, adding a 5% ferrous ammonium sulfate solution subjected to filtration and sterilization, screening according to the inoculation amount of 10% to obtain sulfate reducing bacteria liquid, introducing pure nitrogen into the anaerobic operation box for 5-8 minutes, sealing the anaerobic bottle, and incubating at 30 ℃ for 3-5 days to obtain sulfate-enriched reducing bacteria strains; the obtained sulfate-enriched reducing bacteria strains are respectively inoculated into fresh culture media containing different sulfate radical mass concentrations according to the inoculation amount of 10 percent and the gradient, the pH is adjusted to be approximately 7.0, and the sulfate radical resistance domestication is carried out by anaerobic culture at the temperature of 30 ℃.
And step S200, adding quicklime into the injection well 61 at the upper part of the coal mine goaf after the mixing reaction is finished.
Specifically, the step S200 includes:
injecting the quick lime water solution into the goaf aged cellar water 72 area gradually through the injection well 61 according to different concentrations by using the high-pressure pump 2 for full reaction;
and sampling and detecting different concentrations in the lower monitoring well 63 according to the corresponding addition completion time to judge whether the reaction is complete.
Wherein the concentration ratio of the quicklime is 5-15%.
Before step S200, the method further includes:
step S210: and collecting an underground water sample, and detecting the water quality condition of underground water to be used as a water quality contrast value before treatment.
According to the invention, the acidic aged pit water in the goaf is treated in situ by using sulfate reducing bacteria, the environmental problems of overproof underground water sulfate radicals, overproof heavy metals and the like caused by coal mining are treated from the source, the acidic aged pit water treated by using the sulfate reducing bacteria has no secondary pollution, is safe and reliable, has lower pollutant mobility, reduces pollution diffusion, and improves the pH value of the acidic aged pit water, so that part of heavy metal ions are precipitated, the concentration of heavy metal pollutants is reduced, the purpose of reducing the harm of heavy metals to the environment is achieved, and the problem that secondary pollution exists in the process of treating the acidic underground water in the mine from the source by using a Permeable Reactive Barrier (PRB) or underground water treatment equipment is solved.
The invention also provides a system for in-situ treatment of the aged pit water in the coal mine goaf by using sulfate reducing bacteria, which comprises a water purification tank 1, an injection well module, a high-pressure pump 2, a strain stirring barrel 3 and a quicklime stirring barrel 4, wherein the injection well module is used for establishing an injection well 61, an upper monitoring well 62 and a lower monitoring well 63 for the coal mine goaf, the upper monitoring well 62 and the lower monitoring well 63 are respectively positioned at the upper stream and the lower stream of the injection well 61 along the water flow direction, one end of the high-pressure pump 2 is connected with the injection well 61, the strain stirring barrel 3 is connected with one end of the high-pressure pump 2 and is used for stirring sulfate reducing bacteria strains, the other end of the strain stirring barrel is connected with the water purification tank 1, one end of the stirring barrel 4 is connected with the high-pressure pump 2, and the other end of the stirring barrel is connected with the quicklime stirring tank 1. Wherein, the high-pressure pump 2 and the injection well 61 are connected through a medicine injection pipe 5.
Specifically, the method for in-situ treatment of the pit water 72 in the goaf of the coal mine by using the sulfate reducing bacteria comprises the following steps:
(1) Hydrogeological survey
Finding out the position scale of a mined-out area of a mining area stratum 71, the water quantity of old pit water 72 of the mined-out area, an underground water flow field of the mining area, an underground water chemical environment, an underground water seepage channel and other hydrogeological related data.
(2) Well construction
According to hydrogeology, a well is drilled on the ground surface of the upper part of the goaf and comprises an injection well 61, an upper monitoring well 62 and a lower monitoring well 63, wherein the upper monitoring well 62 and the lower monitoring well 63 are respectively positioned on the upstream and downstream of the injection well 61 along the water flow direction.
Wherein, the well diameter of the injection well 61 is 150mm, the well depth reaches the goaf, the well casing material adopts corrosion-resistant PE pipe, the pipe diameter is 110mm. In addition, monitoring wells are respectively built on the water surface and the downstream of the underground water in the mining area, so that the underground water can be monitored (water level and water quality); an injection well 61 is formed at the middle of the monitoring well along the direction of the groundwater flow to inject chemicals (sulfate reducing bacteria and quicklime).
(3) Sample collection
Collecting underground water samples before the injection of the medicament or the strain, and detecting the water quality condition of the underground water as a water quality contrast value before treatment.
(4) Obtaining enriched sulfate reducing bacteria
Collecting acidic aged cellar water in a coal mine, separating and purifying to obtain sulfate reducing strains, putting 300mL of sterilized Barls' culture medium into a 500mL anaerobic bottle, adding 5.0mL of 5% ammonium ferrous sulfate solution subjected to filtering sterilization, screening according to the inoculation amount of 10% to obtain sulfate reducing bacteria liquid, introducing pure nitrogen into an anaerobic operation box for 5 minutes, sealing the anaerobic bottle, and incubating at 30 ℃ for 3-5 days to obtain enriched sulfate reducing bacteria.
More specifically, 10mL of acid aged cellar water is added into a 10mLCMD culture medium, the mixture is placed in an anaerobic incubator at 30 ℃ and is cultured in a dark place for 72h, 1% of culture solution is transferred into a fresh CDM culture medium every 72h, after the process is repeated for 3 times, 1mL of culture solution is filtered through a 0.22-micrometer filter membrane, the valence state and the content of sulfur are measured, flora with sulfate radical reducing capacity is selected as target flora for separation and purification, the sulfate reducing bacteria liquid obtained is screened according to 10% inoculation quantity, in an anaerobic operation box, after pure nitrogen is introduced for 5 minutes, an anaerobic bottle is sealed, and the mixture is incubated at 30 ℃ for 3 \96335days, so that the enriched sulfate reducing bacteria are obtained.
(5) Sulfate-resistant capacity domestication of sulfate reducing bacteria
Respectively inoculating the enriched sulfate reducing bacteria into fresh culture media containing different sulfate radical mass concentrations (5, 10, 15, 20 mg/L) according to the inoculation amount of 10 percent in a gradient manner, adjusting the pH value to about 7.0, and carrying out anaerobic culture at the temperature of 30 ℃ for 48h for sulfate radical resistance domestication.
(6) Sulfate reducing bacteria
And injecting sulfate reducing bacteria strains into an injection well 61 at the upper part of the coal mine goaf for mixing reaction. More specifically, domesticated sulfate reducing bacteria strains are injected into aged cellar water at a concentration of 5% through an injection well 61 by using a high-pressure pump 2, wait for reaction, and are sampled and sent to a downstream monitoring well on the 0 th day, the 1 st day, the 2 nd day, the 3 rd day, the 5 th day, the 8 th day and the 10 th day respectively.
Wherein, the reaction principle is as follows:
the principle of the reaction of Sulfate Reducing Bacteria (SRB) with sulfate: SRB to SO 4 2- The reduction is divided into 3 processes: 1) And (5) decomposing. The stage is the degradation reaction of organic matter, and SRB decomposes macromolecular organic matter into small molecular CH 2 COOH and generates the direct energy substance ATP and electrons. 2) And (4) an electron transport process. Electrons generated by the first step process pass through cytochrome C in SRB cells 3 And electron transfer complex. 3) And (4) an oxidation process. SO delivered to the body 4 2- And in SO 4 2- S is produced in the presence of reductase 2- And S is 2- With free H in acid mine wastewater + Generation of H 2 S, thereby reducing SO in the acidic aged cellar water 4 2- And (4) concentration.
(7) Limestone is injected
And adding quicklime into an injection well 61 at the upper part of the coal mine goaf after the mixing reaction is finished.
The other main pollutants in the underground water of the coal mine goaf are low pH value, iron and manganese ions, and S is generated by reducing the iron ions 2- Iron sulfide or ferrous sulfide precipitate is generated by reaction, and quicklime is required to be added for treatment when the pH value is increased and the manganese ions are reduced.
Adding the quicklime according to the concentration of 5%, 10% and 15% respectively, injecting a quicklime water solution into a goaf aged cellar water 72 area through an injection well 61 by using a high-pressure pump 2, performing sampling detection after full reaction, and performing sampling inspection on downstream monitoring wells on 0 th day, 1 st day, 2 nd day, 3 rd day, 5 th day, 8 th day and 10 th day after the addition of each proportion concentration is finished.
It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. Based on the embodiments of the present invention, those skilled in the art may make other variations or modifications without creative efforts, and shall fall within the protection scope of the present invention.
Claims (10)
1. A method for in-situ treatment of pit water in a coal mine goaf by sulfate reducing bacteria is characterized by comprising the following steps:
injecting sulfate reducing bacteria strains into an injection well at the upper part of the coal mine goaf for mixed reaction;
and adding quicklime into an injection well at the upper part of the coal mine goaf after the mixing reaction is finished.
2. The method for in-situ treatment of pit water in a coal mine goaf by using sulfate reducing bacteria according to claim 1, wherein before the step of injecting sulfate reducing bacteria strains into an injection well at the upper part of the coal mine goaf for mixed reaction, the method further comprises the following steps:
establishing an injection well at the upper surface of the coal mine goaf, wherein the well depth of the injection well extends to the coal mine goaf.
3. The method for in-situ treatment of pit water in a goaf of a coal mine by using sulfate-reducing bacteria as claimed in claim 2, further comprising:
and establishing an upper monitoring well and a lower monitoring well in the coal mine goaf, wherein the upper monitoring well and the lower monitoring well are respectively positioned on the upstream and the downstream of the injection well along the water flow direction.
4. The method for in-situ treatment of pit water in a coal mine goaf by using sulfate reducing bacteria according to claim 2, wherein before the step of injecting sulfate reducing bacteria strains into an injection well at the upper part of the coal mine goaf for mixed reaction, the method further comprises the following steps:
collecting acidic aged cellar water in a coal mine, separating and purifying to obtain sulfate reducing bacteria, putting a sterilized Barls' culture medium into an anaerobic bottle, adding a 5% ferrous ammonium sulfate solution subjected to filtration and sterilization, screening according to the inoculation amount of 10% to obtain sulfate reducing bacteria liquid, introducing pure nitrogen into the anaerobic operation box for 5-8 minutes, sealing the anaerobic bottle, and incubating at 30 ℃ for 3-5 days to obtain sulfate-enriched reducing bacteria strains;
the obtained sulfate-enriched reducing bacteria strains are respectively inoculated into fresh culture media containing different sulfate radical mass concentrations according to the inoculation amount of 10 percent and the gradient, the pH is adjusted to be approximately 7.0, and the sulfate radical resistance domestication is carried out by anaerobic culture at the temperature of 30 ℃.
5. The method for in-situ treatment of the aged pit water in the coal mine goaf by using the sulfate reducing bacteria as claimed in claim 2, wherein the concentration ratio of the quicklime is 5-15%.
6. The method for in-situ treatment of the aged pit water in the coal mine goaf by using the sulfate reducing bacteria as claimed in claim 5, wherein the step of adding the quicklime to the injection well at the upper part of the coal mine goaf after the completion of the mixing reaction comprises the following steps:
injecting the quicklime water solution into a goaf aged cellar water area gradually through an injection well according to different concentrations by using a high-pressure pump to perform full reaction;
and sampling and detecting different concentrations in a lower monitoring well according to the corresponding addition completion time to judge whether the reaction is complete.
7. The method for in-situ treatment of pit water in a coal mine goaf using sulfate-reducing bacteria according to claim 2, wherein said step of establishing an injection well at the upper surface of the coal mine goaf, wherein the well depth of said injection well extends to the coal mine goaf, further comprises:
and determining the position and the depth of the injection well according to geological and hydrogeological conditions of the coal mine goaf, wherein the geological and hydrogeological conditions of the coal mine goaf comprise one or more of the water quantity of the aged pit, the underground water flow field of the mining area, the chemical environment of underground water and the underground water seepage channel.
8. The method for in-situ treatment of aged pit water in a coal mine goaf by using sulfate reducing bacteria according to claim 1, wherein before the step of injecting sulfate reducing bacteria strains into an injection well at the upper part of the coal mine goaf for mixing reaction, the method further comprises the following steps:
and collecting an underground water sample, and detecting the water quality condition of underground water to be used as a water quality contrast value before treatment.
9. The system for in-situ treatment of the pit water in the coal mine goaf by using the sulfate reducing bacteria is applied to the method for in-situ treatment of the pit water in the coal mine goaf by using the sulfate reducing bacteria as claimed in any one of claims 1 to 8, and is characterized by comprising the following steps:
a water purifying tank;
the system comprises an injection well module, a monitoring module and a monitoring module, wherein the injection well module is used for establishing an injection well, an upper monitoring well and a lower monitoring well for a coal mine goaf, and the upper monitoring well and the lower monitoring well are respectively positioned on the upstream and the downstream of the injection well along the water flow direction;
a high pressure pump having one end for connection with the injection well;
the strain stirring barrel is connected with one end of the high-pressure pump and is used for stirring sulfate reducing bacteria strains, and the other end of the strain stirring barrel is connected with the purified water tank;
one end of the quicklime stirring barrel is connected with the high-pressure pump, and the other end of the quicklime stirring barrel is connected with the water purifying tank.
10. The system for in-situ treatment of pit water in a goaf of a coal mine by sulfate-reducing bacteria according to claim 9, wherein the high-pressure pump is connected with the injection well through a chemical injection pipe.
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| CN114749479A (en) * | 2022-05-30 | 2022-07-15 | 中南大学 | Method for repairing arsenic-containing gold tailings by using plant-microorganism combination |
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