CN115259460B - Treatment method of brackish mine water of coal mine - Google Patents
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 384
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000003245 coal Substances 0.000 title claims abstract description 15
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- 238000010612 desalination reaction Methods 0.000 claims abstract description 42
- 238000001728 nano-filtration Methods 0.000 claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 claims abstract description 40
- 239000012466 permeate Substances 0.000 claims abstract description 22
- 230000009467 reduction Effects 0.000 claims abstract description 19
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- 238000001223 reverse osmosis Methods 0.000 claims description 11
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- 239000001301 oxygen Substances 0.000 claims description 3
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- 238000005260 corrosion Methods 0.000 abstract description 7
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- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 235000019658 bitter taste Nutrition 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000035622 drinking Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
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Classifications
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a treatment method of brackish well water of a coal mine, which comprises the following steps of: preprocessing, namely precipitating mine water in an underground water sump and removing suspended matters; step S02: salt reduction treatment, namely sequentially carrying out primary precise filtration and salt reduction treatment on pretreated water by nanofiltration equipment, wherein concentrated solution is used for production water for activities, and permeate enters a clean water bin; step S03: the water in the clean water bin comprises at least three waterways, wherein the first waterway is that the water in the clean water bin sequentially passes through secondary precise filtering and secondary nanofiltration equipment, and permeate disinfection treatment is carried out to obtain domestic water; the second waterway is the water in the clean water bin and is directly used as production activity water; and the third waterway enters an underground water supply network to carry out salt reduction and desalination treatment again, and permeate is used for equipment cooling. The invention has the beneficial effects that: the water quality of the mine water is improved, the influences of corrosion, scaling and the like are reduced, the maintenance cost is reduced, and the comprehensive utilization of the mine water resources is promoted.
Description
Technical Field
The invention relates to the technical field of coal mine water treatment, in particular to a treatment method of brackish well water of a coal mine.
Background
The brackish water is water resources such as lake water, river water, underground water and the like which have high mineralization degree and cannot be directly utilized or have small utilization range, and can be divided into brackish water (1-3 g/L), brackish water (3-5 g/L), medium salinity (5-10 g/L) and high salinity brackish water (more than 10 g/L) according to the salinity content. The brackish water contains a plurality of heavy metals and harmful impurities, has bitter taste, is difficult to drink directly, and causes gastrointestinal dysfunction and low immunity after long-term drinking.
Although fresh water resources in China are lack, the resources of brackish water are abundant, and particularly in coal mines operated by workers, whether the coal mines are in the eastern part or the western part of China, due to the high mineralization property of mine water, the salt content is basically attributed to brackish water, so that a large amount of mine water cannot be effectively utilized and is directly discharged, on one hand, shallow underground water is extracted from a mine in the production process, agricultural water and domestic water are contended, and on the other hand, a large amount of highly mineralized mine water is discharged to pollute surface water and waste water resources.
At present, a common treatment technology for brackish mine water with the salt content ranging from 1000 m/L to 3000m/L is a coagulation-precipitation technology, mainly comprises the steps of removing suspended matters (SS), failing to remove salt and reduce salt, wherein the treated water also belongs to hypersalinity mine water or brackish water, utilization is limited, mine drainage needs to meet the requirement that the salt content is not more than 1000 mg/L except meeting the relevant legal regulation standard, and the relevant water quality factor value also meets or is superior to the corresponding value of the surface water environment quality defined by the environmental functional division of a receiving water body; the current treatment mode can not meet the requirement, and some zero emission processes have large investment and high running cost.
According to the Chinese patent literature, CN108298745B and a saline-alkali soil brackish water desalination treatment process, firstly, collecting water, and arranging a water collecting well, wherein the water collecting well is used for collecting brackish water in deep soil of the saline-alkali soil, the brackish water is raw water in a water treatment process, one side of the water collecting well is provided with a water collecting tank, the water collecting tank is connected to the water collecting well through a pipeline, a water lifting pump is arranged on a pipeline between the water collecting tank and the water collecting well in series, and the water lifting pump lifts raw water in the water collecting well into the water collecting tank for standby; step two, sterilization, namely arranging a sterilization box, wherein a sterilization device is arranged in the sterilization box, the sterilization box is connected to the water collecting box through a pipeline, a raw water pump is arranged on the pipeline between the sterilization box and the water collecting box, and the raw water pump conveys water in the water collecting box into the sterilization box for sterilization; step three, filtering, namely setting a multi-medium filter, wherein the water inlet end of the multi-medium filter is connected to the water outlet end of the sterilization box, and one side of the water outlet end of the multi-medium filter is connected with a fine sand filter, an activated carbon adsorption filter and a fine filter in series, and raw water is output to enter a reverse osmosis host after passing through the fine filter; step four, desalting, namely conveying the filtered water output from the reverse osmosis host to an ion exchange mixed bed, wherein free acid type cationic resin and heavy carbonic acid type strong alkaline anionic resin are arranged in the ion exchange mixed bed, and removing salt ions remained in the filtered water when the filtered water flows through the ion exchange mixed bed; step five, disinfection, namely arranging a disinfection box, wherein a water taking controller is arranged on the disinfection box, the desalted filtered water is conveyed to the disinfection box for disinfection, the filtered water is disinfected to form direct drinking water, the direct drinking water is connected with the disinfection box and is used for storing disinfected fresh water, a water supply pump is arranged in the fresh water tank, the direct drinking water is conveyed to a water taking point through the water supply pump, the water taking point is provided with a water taking tap, a flow sensor is arranged in the water taking tap, and a signal of the flow sensor is connected to the water taking controller; an irrigation joint is connected in series with the water inlet end of the disinfection box and is connected to a drip irrigation device through a conveying pipeline, an electromagnetic control valve is connected to the irrigation joint, and a signal of the electromagnetic control valve is connected to the water taking controller; step six, distributing, wherein after the flow sensor detects that the water flows out of the water taking tap, a signal is transmitted to the water taking controller, and the water taking controller closes the electromagnetic control valve; when the flow sensor outputs no signal, the water taking faucet has no water taking requirement, the water taking controller controls the electromagnetic control valve to be opened, and the treated fresh water is conveyed to the irrigation joint for irrigation. Although the step of the saline-alkali land brackish water desalination treatment is provided, the process of the saline-alkali land brackish water is mainly used for treating the precipitated water, but different treatment processes are not carried out according to different requirements, such as how to cope with the requirements of relatively low water quality requirements of grouting, fire protection and the like on production water, main production and domestic water sources of mines or how to discharge when the water quantity of the mine water is large, if the brackish water is only treated into the fresh water, the input cost is high, the treatment process is complex, and the utilization mode of the brackish water is not fully embodied.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information has been made as prior art that is well known to a person of ordinary skill in the art.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: how to solve the problems that the existing treatment process of brackish bitter well water can not meet the requirements of multiple situations and has lower utilization rate.
The invention solves the technical problems by the following technical means:
The treatment method of the brackish well water of the coal mine comprises the following steps of
Step S01: preprocessing, namely precipitating mine water in an underground water sump and removing suspended matters;
Step S02: salt reduction treatment, namely sequentially carrying out primary precise filtration and salt reduction treatment on pretreated water by nanofiltration equipment, wherein the treated concentrated solution is used for producing water for activities, and the treated permeate enters a clean water bin;
step S03: the water in the clean water bin comprises at least three waterways, wherein the first waterway is that the water in the clean water bin sequentially passes through secondary precise filtration and secondary nanofiltration equipment, the treated concentrated solution enters a pre-sedimentation regulating tank again, and the treated permeate is disinfected to be used as domestic water;
the second waterway is the water in the clean water bin and is directly used as production activity water;
The third waterway is that water in the clean water bin enters the underground water supply network, the water in the underground water supply network is subjected to salt reduction and desalination treatment again, the treated concentrated solution enters the underground water bin, and the permeate is used for equipment cooling, emulsion configuration and spray dust reduction.
The method precipitates and removes suspended matters at the position of the mine water through pretreatment, the salt content of the concentrated solution treated by the primary precise filtration and nanofiltration equipment is relatively low, the concentrated solution can be directly used for production activities with relatively low requirements on water quality, such as grouting, fire protection and the like, the concentrated water is not required to be treated by adopting processes, such as evaporation crystallization and the like, the investment of expenses is reduced, meanwhile, the generation of dangerous wastes, such as salt impurities and the like, is completely eradicated, good economic and environmental benefits are achieved, and the permeate enters a clean water bin to be used as a main production and living water source of the mine; the water in the clean water bin is provided with three waterways, and the water is directly used or used after being treated according to different occasions. By adopting the method provided by the application, the salt content of water in the clean water bin can be controlled within 1000mg/L, the water quality of the mine water is improved, the influence of corrosion, scaling and the like caused by hypersalinity and high scaling ions is reduced, the maintenance of equipment, pipe network and other mine production is reduced, and the comprehensive utilization of the resources of the mine water is promoted while the mine production is promoted; the water in the clean water bin is further treated or directly used, so that the water treatment device is applied to different occasions, meets the water utilization of various aspects of a mine, and further improves the utilization rate of the mine water.
Preferably, in the step S01, water in the underground sump enters the pre-sedimentation adjusting tank through the lift pump to perform sedimentation treatment, the settled clean water enters the efficient clarification tank, suspended matters and the chemical oxygen demand are removed, and then the suspended matters are further removed through the sand filter and the laminated filter in sequence.
Preferably, in step S02, the mine water after the suspended matters are removed sequentially enters a first security filter and a nanofiltration device.
Preferably, in the step S02, the treated concentrate is used for grouting and fire-fighting production activities.
Aiming at the brackish mine water with the salt content concentration range of 1000 mg/L-3000 mg/L, the invention utilizes the nanofiltration technology to have the advantages of ion selectivity, moderate interception relative molecular weight, low operation pressure and large flux, carries out salt reduction and desalination on the brackish mine water, and the salt content of the outlet water after nanofiltration treatment is less than 1000mg/L, and simultaneously, the salt-containing mineral water is basically free of sulfate, the content of calcium and magnesium ions is greatly reduced compared with the original water, thus effectively reducing the influence of water on corrosion, structure, blockage and the like generated by pipelines and equipment, and simultaneously meeting the requirements of related emission standards; the salt content of the concentrated water is relatively high, but the salt content of the concentrated water is basically less than 10000mg/L through controlling and adjusting parameters such as desalination rate, recovery rate and the like, and the method is applicable to production activities such as underground grouting and the like, and realizes the full utilization of nanofiltration concentrated water.
Preferably, in the step S03, water entering the clean water bin is discharged when the amount of mine water exceeds the total amount of active water generated by the mine.
When the mine water is smaller than the mine production water, the mine water can be fully utilized without discharging; when the mine water is larger than the mine production water, the mine production water fully utilizes the mine water, water sources such as surface water or shallow groundwater are not needed, and redundant mine drainage can meet the requirements of related environmental protection standards.
Preferably, in the step S03, the water in the first waterway is sequentially passed through the second security filter and the second nanofiltration device, the treated concentrated solution re-enters the pre-sedimentation adjusting tank, and the treated permeate is sterilized by a chlorine dioxide generator and used as domestic water.
When the water after nanofiltration treatment is used as domestic water, a second security filter, a second level nanofiltration and a disinfection treatment section are additionally arranged, so that ions in the water can be further removed, the water quality can be ensured to meet the requirements of related standards, and the desalination rate of 70% can ensure that the salt content of the water is less than 300mg/L, and the water quality standard of the domestic water can be met.
Preferably, in the step S03, the water in the second waterway is clean water bin is directly used as water for spraying, dust settling, fire extinguishing and production activities.
Preferably, in step S03, the third waterway is that water in the clean water bin enters the underground water supply network, the water in the underground water supply network sequentially passes through the third security filter and the reverse osmosis device to be subjected to salt reduction and desalination treatment, the treated concentrated solution enters the underground water bin, and the permeate is used for preparing water for emulsion and circulating cooling for the electromechanical device.
For water with higher water quality requirements, such as emulsion configuration, electromechanical circulating cooling and the like, a third security filtering and reverse osmosis treatment working section is additionally arranged in front of a water terminal, and the water supply in the underground water supply network is desalted and purified, so that the salt content of the discharged water can be ensured to be not higher than 50mg/L by 95 percent of desalination rate, and the water quality standard of all water used in mine production can be completely met.
Preferably, in the step S03, the wastewater generated by the emulsion preparation and the electromechanical device enters a downhole sump.
Preferably, in the step S02, when the salt content of the mine water is in the range of 2000mg/L to 3000mg/L, the desalination rate of the nanofiltration device is greater than 67%, the recovery rate is less than 90%, and when the salt content of the mine water is in the range of less than 2000mg/L, the desalination rate of the nanofiltration device is greater than 50%, and the recovery rate is less than 90%;
in the step S03, the desalination rate of the secondary nanofiltration equipment is more than 50%, the recovery rate is less than 95%, the recommended desalination rate is 70% and the recovery rate is 90%, so that a higher water yield is ensured, and the effluent can retain beneficial ions while removing most pollutants; the selective range of the desalination rate of reverse osmosis is more than 80%, the selective range of the recovery rate is more than 50%, the recommended desalination rate is 95%, the recovery rate is 80%, and the effective removal of ions in water can be realized while the higher water yield is ensured.
The invention has the advantages that:
(1) The method precipitates and removes suspended matters at the position of the mine water through pretreatment, the salt content of the concentrated solution treated by the primary precise filtration and nanofiltration equipment is relatively low, the concentrated solution can be directly used for production activities with relatively low requirements on water quality, such as grouting, fire protection and the like, the concentrated water is not required to be treated by adopting processes, such as evaporation crystallization and the like, the investment of expenses is reduced, meanwhile, the generation of dangerous wastes, such as salt impurities and the like, is completely eradicated, good economic and environmental benefits are achieved, and the permeate enters a clean water bin to be used as a main production and living water source of the mine; the water in the clean water bin is provided with three waterways, and the water is directly used or used after being treated according to different occasions. By adopting the method provided by the application, the salt content of water in the clean water bin can be controlled within 1000mg/L, the water quality of the mine water is improved, the influence of corrosion, scaling and the like caused by hypersalinity and high scaling ions is reduced, the maintenance of equipment, pipe network and other mine production is reduced, and the comprehensive utilization of the resources of the mine water is promoted while the mine production is promoted; the water in the clean water bin is further treated or directly used, so that the water treatment device is applied to different occasions, meets the water utilization of various aspects of a mine, and further improves the utilization rate of the mine water.
(2) Aiming at the brackish mine water with the salt content concentration range of 1000 mg/L-3000 mg/L, the invention utilizes the nanofiltration technology to have the advantages of ion selectivity, moderate interception relative molecular weight, low operation pressure and large flux, carries out salt reduction and desalination on the brackish mine water, and the salt content of the outlet water after nanofiltration treatment is less than 1000mg/L, and simultaneously, the salt-containing mineral water is basically free of sulfate, the content of calcium and magnesium ions is greatly reduced compared with the original water, thus effectively reducing the influence of water on corrosion, structure, blockage and the like generated by pipelines and equipment, and simultaneously meeting the requirements of related emission standards; the salt content of the concentrated water is relatively high, but the salt content of the concentrated water is basically less than 10000mg/L through controlling and adjusting parameters such as desalination rate, recovery rate and the like, so that the method is applicable to production activities such as underground grouting and the like, and the full utilization of nanofiltration concentrated water is realized;
(3) When the mine water is smaller than the mine production water, the mine water can be fully utilized without discharging; when the mine water is larger than the mine production water, the mine production water fully utilizes the mine water, water sources such as surface water or shallow groundwater are not needed, and redundant mine drainage can meet the requirements of related environmental protection standards;
(4) For water with higher water quality requirements, such as emulsion configuration, electromechanical circulating cooling and the like, a third security filtering and reverse osmosis treatment section is additionally arranged in front of a water terminal, and the water supply in the underground water supply network is desalted and purified, wherein the salt content of the discharged water is not higher than 50mg/L by 95 percent of desalination rate, so that the water quality standard of all water used in mine production can be completely met;
(5) The desalination rate of the secondary nanofiltration equipment is more than 50%, the recovery rate is less than 95%, the recommended desalination rate is 70%, the recovery rate is 90%, the higher water yield is ensured, and the effluent can retain beneficial ions while removing most pollutants; the selective range of the desalination rate of reverse osmosis is more than 80%, the selective range of the recovery rate is more than 50%, the recommended desalination rate is 95%, the recovery rate is 80%, and the effective removal of ions in water can be realized while the higher water yield is ensured.
Drawings
FIG. 1 is a schematic outflow diagram of a method for treating brackish well water in a coal mine according to an embodiment of the present invention;
Reference numerals in the drawings: 1. a downhole sump; 2. a preliminary sedimentation adjusting tank; 3. an efficient clarification tank; 4. a sand filter; 5. lamination filter; 6. a clean water bin; 7. a downhole water supply network;
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
as shown in FIG. 1, the treatment method of the brackish well water of the coal mine comprises the following steps of
Step S01: and (3) pretreatment, namely, enabling water in the underground water sump 1 to enter a pre-sedimentation adjusting tank 2 through a lifting pump for sedimentation treatment, enabling clear water after sedimentation to enter a high-efficiency clarifying tank 3, removing suspended matters and chemical oxygen demand, and then sequentially passing through a sand filter 4 and a laminated filter 5 to further remove the suspended matters.
The salt content of the mine water in the pre-sedimentation regulating tank 2 is controlled to be in the range of 1000mg/L to 3000mg/L, and the salt content belongs to the brackish bitter water category. The pre-sedimentation adjusting tank 2 has the functions of adjusting water quantity and sedimentation at the front end of water treatment in mine drainage treatment, and sludge with larger mass is settled at the bottom of the tank and has a sludge discharge facility.
The high-efficiency clarification tank 3 is a high-composite integrated flocculation/sedimentation/concentration tank, and is only needed in the prior art, for example, a certain high-efficiency clarification tank 3 mainly comprises a mixing zone, a reaction zone, a sedimentation/concentration zone and an inclined tube separation zone; the mixing area is provided with a quick mechanical stirrer for quickly mixing the added flocculant, and the flocculant adopts aluminum salt or ferric salt; specifically, introducing water in the pre-sedimentation regulating tank 2 into a reaction tank, enabling the water in the reaction tank to be uniformly mixed through an impeller, and adding a proper amount of coagulant aid to generate a large amount of alum blossom; the alum blossom is slowly collected into sludge at the bottom of a precipitation/concentration zone and concentrated; clear water is collected by the inclined tube separation zone.
Step S02: salt reduction treatment, namely sequentially feeding mine water with suspended matters removed into a first security filter and nanofiltration equipment, wherein concentrated solution processed by the nanofiltration equipment is used for grouting and fire fighting, and the processed permeate enters a clean water bin 6;
Aiming at the brackish mine water with the salt content concentration range of 1000 mg/L-3000 mg/L, the embodiment utilizes the nanofiltration technology to have the advantages of ion selectivity, moderate interception relative molecular weight, low operation pressure and large flux, carries out salt reduction and desalination on the brackish mine water, and the salt content of the permeate liquid after nanofiltration treatment is less than 1000mg/L, simultaneously does not contain sulfate basically, and the content of calcium and magnesium ions is greatly reduced compared with the raw water, thereby effectively reducing the influence of water on corrosion, structure, blockage and the like generated by pipelines and equipment, and meeting the requirements of related emission standards; the salt content of the concentrated solution is relatively high, but the salt content in the concentrated water is basically less than 10000mg/L through controlling and adjusting parameters such as desalination rate, recovery rate and the like, and the concentrated solution can be suitable for production activities such as underground grouting and the like, so that the full utilization of nanofiltration concentrated water is realized.
When the salt content of mine water is in the range of 2000 mg/L-3000 mg/L, the selective range of the desalination rate of nanofiltration is more than 67%, the selective range of the recovery rate is less than 90%, and the recommended desalination rate of nanofiltration is 70% and the recovery rate is 80%;
When the mineralization degree of mine water is less than 2000mg/L, the selective range of the desalination rate of nanofiltration is more than 50%, the selective range of the recovery rate is less than 90%, and the recommended desalination rate of nanofiltration is 60% and the recovery rate is 80%.
Step S03: the water in the clean water bin 6 comprises three waterways;
The first waterway is that water in the clean water bin 6 sequentially passes through secondary precise filtration and secondary nanofiltration equipment, the treated concentrated solution enters the pre-sedimentation regulating tank 2 again, and the treated permeate is disinfected to be used as domestic water;
Specifically, the first waterway is that water in the clean water bin 6 sequentially passes through a second security filter and a second nanofiltration device, the treated concentrated solution reenters the pre-sedimentation regulating tank 2, and the treated permeate is disinfected by a chlorine dioxide generator to be used as domestic water.
When the water after nanofiltration treatment is used as domestic water, a second security filter, a second level nanofiltration and a disinfection treatment section are additionally arranged, so that ions in the water can be further removed, the water quality can be ensured to meet the requirements of related standards, and the desalination rate of 70% can ensure that the salt content of the water is less than 300mg/L, and the water quality standard of the domestic water can be met.
The desalination rate of the secondary nanofiltration equipment is more than 50%, the recovery rate is less than 95%, the recommended desalination rate is 70%, the recovery rate is 90%, the higher water yield is ensured, and the effluent can retain beneficial ions while removing most pollutants.
The second waterway is that the water in the clean water bin 6 is directly used as production activity water; specifically, the water is directly used as water for spraying dust fall, fire extinguishment and flushing production activities.
The third waterway is that water in the clean water bin 6 enters the underground water supply network 7, the water in the underground water supply network 7 is subjected to salt reduction and desalination treatment again, the treated concentrated solution enters the underground water bin 1, and the permeate is used for equipment cooling.
Specifically, the third waterway is that the interior of the clean water bin 6 enters the underground water supply network 7, the water of the underground water supply network 7 sequentially passes through a third cartridge filter and reverse osmosis equipment to be subjected to salt reduction and desalination treatment, the treated concentrated solution enters the underground water bin 1, and the permeate is used for preparing water for emulsion and circulating cooling for electromechanical equipment.
For water with higher water quality requirements, such as emulsion configuration, electromechanical circulating cooling and the like, a third security filtering and reverse osmosis treatment section is additionally arranged in front of a water terminal, and the water supply in the underground water supply network 7 is desalted and purified, wherein the salt content of the discharged water is not higher than 50mg/L by 95 percent of desalination rate, so that the water quality standard of all water used in mine production can be completely met.
The wastewater generated by emulsion preparation and electromechanical equipment enters a downhole sump 1.
The desalination rate of reverse osmosis equipment can be selected to be more than 80%, the recovery rate can be selected to be more than 50%, the recommended desalination rate is 95%, and the recovery rate is 80%, so that ions in water can be effectively removed while higher water yield is ensured.
The water of the underground water supply network 7 can also be directly used for spray dust removal, fire extinguishment and flushing.
The embodiment precipitates and removes suspended matters at the position of mine water through pretreatment, the salt content of concentrated solution processed by primary precise filtration and nanofiltration equipment can be controlled and regulated by parameters such as desalination rate, recovery rate and the like, so that the salt content in the concentrated water is less than 10000mg/L, the concentrated water can be directly used for production activities such as grouting, fire fighting and the like with relatively low requirements on water quality, the concentrated water is not required to be processed by adopting processes such as evaporation crystallization and the like, the investment of expenses is reduced, meanwhile, the generation of hazardous wastes such as mixed salt and the like is avoided, good economic and environmental benefits are realized, and the permeate enters a clean water bin 6 to be used as a main production and domestic water source of a mine; the water in the clean water bin 6 is provided with three waterways, and the water is directly used or treated for use in different occasions. By adopting the method provided by the application, the salt content of water in the clean water bin 6 can be controlled within 1000mg/L, the water quality of the mine water is improved, the influence of corrosion, scaling and the like caused by hypersalinity and high scaling ions is reduced, the maintenance of equipment, pipe network and other mine production is reduced, and the comprehensive utilization of the resources of the mine water is promoted while the mine production is promoted; the water in the clean water bin 6 is further treated or directly used, so that the water utilization in various aspects of the mine is met and the utilization rate of the mine water is further improved.
Embodiment two:
On the basis of the above embodiment, in the step S03, the water entering the clean water bin 6 is discharged when the mine water quantity exceeds the total amount of the produced active water in the mine.
When the mine water is smaller than the mine production water, the mine water can be fully utilized without discharging; when the mine water is larger than the mine production water, the mine production water fully utilizes the mine water, water sources such as surface water or shallow groundwater are not needed, and redundant mine drainage can meet the requirements of related environmental protection standards.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. The treatment method of the brackish well water of the coal mine is characterized by comprising the following steps of
Step S01: preprocessing, namely precipitating mine water in an underground water sump and removing suspended matters; the mine water is brackish water with the salt content concentration range of 1000mg/L to 3000 mg/L;
step S02: salt reduction treatment, namely carrying out salt reduction treatment on pretreated water sequentially through primary precise filtration and nanofiltration equipment, wherein the treated concentrated solution is used for producing water for activities, and the treated permeate enters a clean water bin;
step S03: the water in the clean water bin comprises at least three waterways, wherein the first waterway is that the water in the clean water bin sequentially passes through secondary precise filtration and secondary nanofiltration equipment, the treated concentrated solution enters a pre-sedimentation regulating tank again, and the treated permeate is disinfected to be used as domestic water;
the second waterway is the water in the clean water bin and is directly used as production activity water;
The third waterway is that water in the clean water bin enters an underground water supply network, the water in the underground water supply network is subjected to salt reduction and desalination treatment again, the treated concentrated solution enters the underground water bin, and the permeate is used for equipment cooling, emulsion configuration and spray dust reduction;
specifically, the first waterway is that water in a clean water bin sequentially passes through a second security filter and a second nanofiltration device, the treated concentrated solution reenters a pre-sedimentation regulating tank, and the treated permeate is disinfected by a chlorine dioxide generator to be used as domestic water; the second waterway is the water in the clean water bin and is directly used as the water for spraying, dust settling, fire extinguishing and flushing production activities; the third waterway is that water in the clean water bin enters an underground water supply network, the water in the underground water supply network sequentially passes through a third security filter and reverse osmosis equipment to be subjected to salt reduction and desalination treatment, the treated concentrated solution enters the underground water bin, and permeate is used for preparing water for emulsion and circulating cooling for electromechanical equipment; the wastewater generated by emulsion preparation and electromechanical equipment enters a downhole sump;
In the step S02, when the salt content of the mine water is in the range of 2000mg/L to 3000mg/L, the desalination rate of the nanofiltration equipment is more than 67 percent, the recovery rate is less than 90 percent, and when the salt content of the mine water is in the range of less than 2000mg/L, the desalination rate of the nanofiltration equipment is more than 50 percent, and the recovery rate is less than 90 percent; in the step S03, the desalination rate of the secondary nanofiltration equipment is more than 50%, and the recovery rate is less than 95%.
2. The method for treating brackish well water in coal mine according to claim 1, wherein in the step S01, water in a downhole sump is sent into a pre-sedimentation adjusting tank for sedimentation treatment through a lift pump, and the settled clear water is sent into a high-efficiency clarification tank for removing suspended matters and chemical oxygen demand, and then sequentially sent to a sand filter and a lamination filter for further removing the suspended matters.
3. The method for treating brackish well water of coal mine according to claim 2, wherein in the step S02, the mine water after removing suspended matters sequentially enters a first security filter and a nanofiltration device.
4. A method for treating brackish well water in a coal mine according to claim 3, wherein the treated concentrate is used in grouting and fire fighting production activities in step S02.
5. The method for treating brackish well water in coal mine according to claim 1, wherein in the step S03, the water in the clean water bin is discharged when the amount of the mine water exceeds the total amount of the produced running water in the mine.
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