CN115259460A - Method for treating brackish mine water of coal mine - Google Patents
Method for treating brackish mine water of coal mine Download PDFInfo
- Publication number
- CN115259460A CN115259460A CN202210921049.5A CN202210921049A CN115259460A CN 115259460 A CN115259460 A CN 115259460A CN 202210921049 A CN202210921049 A CN 202210921049A CN 115259460 A CN115259460 A CN 115259460A
- Authority
- CN
- China
- Prior art keywords
- water
- mine
- bin
- nanofiltration
- enters
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 399
- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000003245 coal Substances 0.000 title claims abstract description 20
- 150000003839 salts Chemical class 0.000 claims abstract description 55
- 238000001728 nano-filtration Methods 0.000 claims abstract description 45
- 238000010612 desalination reaction 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
- 230000000694 effects Effects 0.000 claims abstract description 16
- 230000009467 reduction Effects 0.000 claims abstract description 16
- 235000020681 well water Nutrition 0.000 claims abstract description 16
- 239000002349 well water Substances 0.000 claims abstract description 16
- 238000001914 filtration Methods 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 230000001376 precipitating effect Effects 0.000 claims abstract description 3
- 238000011084 recovery Methods 0.000 claims description 25
- 238000001223 reverse osmosis Methods 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 239000000839 emulsion Substances 0.000 claims description 11
- 238000002360 preparation method Methods 0.000 claims description 10
- 238000005352 clarification Methods 0.000 claims description 6
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 5
- 238000011010 flushing procedure Methods 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 239000004155 Chlorine dioxide Substances 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 235000019398 chlorine dioxide Nutrition 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 239000002351 wastewater Substances 0.000 claims description 3
- 238000011033 desalting Methods 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims description 2
- 239000012141 concentrate Substances 0.000 claims 1
- 125000004122 cyclic group Chemical group 0.000 claims 1
- 230000007797 corrosion Effects 0.000 abstract description 7
- 238000005260 corrosion Methods 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000004659 sterilization and disinfection Methods 0.000 description 19
- 150000002500 ions Chemical class 0.000 description 14
- 230000008569 process Effects 0.000 description 12
- 230000001954 sterilising effect Effects 0.000 description 9
- 230000008901 benefit Effects 0.000 description 8
- 239000013505 freshwater Substances 0.000 description 7
- 230000007613 environmental effect Effects 0.000 description 6
- 230000002262 irrigation Effects 0.000 description 5
- 238000003973 irrigation Methods 0.000 description 5
- 239000002689 soil Substances 0.000 description 5
- 239000002352 surface water Substances 0.000 description 5
- 239000003513 alkali Substances 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910001424 calcium ion Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 238000005342 ion exchange Methods 0.000 description 3
- 229910001425 magnesium ion Inorganic materials 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229940037003 alum Drugs 0.000 description 2
- 230000033558 biomineral tissue development Effects 0.000 description 2
- 235000020188 drinking water Nutrition 0.000 description 2
- 239000003651 drinking water Substances 0.000 description 2
- 239000008394 flocculating agent Substances 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000035622 drinking Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 230000007160 gastrointestinal dysfunction Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- -1 salt ions Chemical class 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
Landscapes
- 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 method for treating brackish well water of a coal mine, which comprises the following steps of S01: pretreating, namely precipitating mine water in the underground water sump and removing suspended matters; step S02: performing salt reduction treatment, namely sequentially performing primary precision filtration and nanofiltration treatment on the pretreated water by using nanofiltration equipment, wherein the concentrated solution is used as water for production activities, and the permeate enters a clear water bin; step S03: the water in the clean water bin is treated again, the water in the clean water bin comprises at least three water paths, the first water path is that the water in the clean water bin sequentially passes through secondary precise filtration and secondary nanofiltration equipment, and the permeate liquid is disinfected and used as domestic water; the second water path is that the water in the clear water bin is directly used as water for production activities; and the third water channel enters an underground water supply network for salt reduction and desalination again, and the permeate is used for equipment cooling. The invention has the beneficial effects that: the quality of the mine water recycled 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 coal mine brackish well water treatment method.
Background
Brackish water refers to water resources such as lake water, river water and underground water which have high mineralization degree and can not be directly utilized or can be utilized in a small range, according to the salt content, the salt water 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). The brackish water contains a lot of heavy metals and harmful impurities, is bitter and astringent in taste, is difficult to directly drink, and causes gastrointestinal dysfunction and low immunity after long-term drinking.
Although fresh water resources are lacked in China, the brackish water resources are abundant, especially in coal mines operated by well workers, no matter the coal mines are in the east or the west of China, due to the high salinity characteristic of mine water, the salt content is basically brackish water, a large amount of mine water cannot be effectively utilized and is directly discharged, so that shallow underground water is extracted from mines, agricultural water and domestic water are strived for in the production process, and pollution to surface water and waste of water resources are caused by discharging a large amount of high salinity mine water.
At present, a common treatment technology for brackish mine water with the salt content ranging from 1000 to 3000m/L is a coagulation-precipitation process, which mainly removes suspended matters (SS) and cannot remove and reduce salt, the treated water also belongs to highly mineralized mine water or brackish water, the utilization is limited, and mine drainage needs to meet the requirements that 'besides meeting relevant legal and regulatory standards, the relevant water quality factor value also meets or is superior to a surface water environment quality corresponding value specified by a receiving water body environment function division, and the salt content cannot exceed 1000 mg/L'; the current treatment mode cannot meet the requirement, and some 'zero emission' processes have large investment and high operation cost.
Chinese patent literature, CN108298745B, saline-alkali soil brackish water desalination treatment process, which comprises the following steps of collecting water, arranging a water collecting well, wherein the water collecting well is used for collecting brackish water in deep soil of saline-alkali soil, the brackish water is raw water in a water treatment process, arranging a water collecting tank on one side of the water collecting well, the water collecting tank is connected to the water collecting well through a pipeline, arranging a water lifting pump in series on the pipeline between the water collecting tank and the water collecting well, and lifting the raw water in the water collecting well into the water collecting tank by the water lifting pump for later use; 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 tank through a pipeline, a raw water pump is arranged on the pipeline between the sterilization box and the water collecting tank, and the raw water pump conveys water in the water collecting tank to the sterilization box for sterilization; step three, filtering, namely arranging a multi-medium filter, connecting a water inlet end of the multi-medium filter to a water outlet end of the sterilization box, connecting a fine sand filter, an activated carbon adsorption filter and a fine filter in series at one side of the water outlet end of the multi-medium filter, and outputting raw water to a reverse osmosis host after passing through the fine filter; step four, desalting, namely conveying the filtered water output from the reverse osmosis host machine to an ion exchange mixed bed, wherein free acid type cation resin and heavy carbonic acid type strong base anion resin are arranged in the ion exchange mixed bed, and removing residual salt ions 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 forms direct drinking water after disinfection, a fresh water box is connected with the disinfection box and used for storing disinfected fresh water, a water supply pump is arranged in the fresh water box, 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 faucet, a flow sensor is arranged in the water taking faucet, and the flow sensor is in signal connection with 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 the electromagnetic control valve is connected to the water taking controller in a signal mode; step six, distribution, wherein after the flow sensor detects that water flows out of the water taking faucet, a signal is transmitted to the water taking controller, and the water taking controller closes the electromagnetic control valve; when the flow sensor has no signal output, the water taking faucet has no water taking requirement, the water taking controller controls the opening of the electromagnetic control valve, and the treated fresh water is conveyed to the irrigation joint for irrigation. Although the steps of saline-alkali soil brackish water desalination treatment are given, the saline-alkali soil brackish water desalination treatment process is mainly a process for treating heavy fresh water, different treatment processes are not carried out according to different requirements, for example, how to meet the requirements of grouting, fire fighting and the like on production water with relatively low requirements on water quality, main production and living water sources of mines, or how to discharge when the water quantity of mine water is large, if the brackish water is only treated into fresh water, the input cost is high, the treatment process is complex, and the utilization mode is not comprehensively reflected.
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 forms part of the prior art that is already known to a person skilled in the art.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to solve the problems that the existing treatment process of brackish well water cannot meet the requirements of multiple conditions and the utilization rate is low.
The invention solves the technical problems through the following technical means:
a method for treating brackish well water from coal mines comprising
Step S01: pretreating, namely precipitating mine water in the underground water sump and removing suspended matters;
step S02: performing salt reduction treatment, namely sequentially performing primary precision filtration and nanofiltration treatment on the pretreated water by using nanofiltration equipment, wherein the treated concentrated solution is used for producing active water, and the treated permeate enters a clear water bin;
step S03: the water in the clean water bin comprises at least three water paths, the first water path is that the water in the clean water bin sequentially passes through secondary fine filtration and secondary nanofiltration equipment, the treated concentrated solution enters a pre-settling regulating tank again, and the treated permeate liquid is disinfected and used as domestic water;
the second water path is that the water in the clear water bin is directly used as water for production activities;
and the third water path 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 again, the treated concentrated solution enters the underground water bin, and the permeate is used for equipment cooling, emulsion preparation and spray dust reduction.
The mine water is precipitated and suspended matters are removed through pretreatment, the salt content of the concentrated solution treated by primary precision 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 fighting and the like, the concentrated water is not required to be treated by processes of evaporative crystallization and the like, the investment cost is reduced, meanwhile, the generation of dangerous wastes, such as miscellaneous salts and the like, is avoided, the economic and environmental benefits are good, and the permeate liquid enters a clear water bin to be used as a main production and living water source of a mine; the water in the clear water bin is provided with three water paths, and the clear water bin can be directly used or used after being treated according to different use occasions. By adopting the method provided by the application, the salt content of the water in the clean water bin can be controlled within 1000mg/L, the reuse water quality of the mine water is improved, the influences of corrosion, scaling and the like caused by high salinity and high scaling ions are reduced, the maintenance and the repair of equipment, pipe networks and other mine production are reduced, and the comprehensive utilization of the mine water resources is powerfully promoted while the mine production is promoted; and the water in the clean water bin is further treated or directly used, so that the clean water bin is applied to different occasions, the water utilization of various aspects of a mine is met, and the utilization rate of the mine water is further improved.
Preferably, in the step S01, the water in the underground sump enters a pre-settling regulating tank through a lift pump for settling treatment, the settled clean water enters a high-efficiency clarification tank, suspended matters and chemical oxygen demand are removed, and then the suspended matters are further removed through a sand filter and a laminated filter in sequence.
Preferably, in the step S02, the mine water from which the suspended matters are removed sequentially enters a first security filter and a nanofiltration device.
Preferably, in the step S02, the treated concentrated solution 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 advantages of nanofiltration technology of ion selectivity, moderate interception relative molecular weight, low operation pressure and large flux to carry out salt reduction and desalination on the brackish mine water, the salt content of the outlet water after nanofiltration treatment is less than 1000mg/L, and simultaneously, the invention basically does not contain sulfate, the content of calcium and magnesium ions is greatly reduced compared with the original water, the invention can effectively reduce the influence of corrosion, structure, blockage and the like of the water body on pipelines and equipment, and can also meet the requirements of related discharge standards; although the salt content of the concentrated water is relatively high, 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 suitable for production activities such as underground grouting and the like and realizes the full utilization of nanofiltration concentrated water.
Preferably, in the step S03, the water entering the clean water warehouse is discharged when the mine water volume exceeds the total amount of the live water produced by the mine.
When the mine water is less 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 and the like are not needed, and redundant mine drainage can meet the requirements of related environmental protection standards.
Preferably, in step S03, the first water path is that water in the clean water bin sequentially passes through the second security filter and the second-stage nanofiltration device, the treated concentrated solution enters the pre-settling regulation tank again, and the treated permeate liquid is disinfected by the chlorine dioxide generator and used as domestic water.
When the outlet water after nanofiltration treatment is used as domestic water, a second security filter, secondary nanofiltration and disinfection treatment working section is additionally arranged, ions in the water can be further removed, the water quality can meet the requirements of relevant standards, the salt content of the outlet water can be guaranteed to be less than 300mg/L by 70% of desalination rate, and the water quality standard of the domestic water can be met.
Preferably, in the step S03, the second water path is water in the clean water bin and is directly used as water for spraying, dedusting, extinguishing and flushing production activities.
Preferably, in step S03, the third water path 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 safety filter and a reverse osmosis device to perform salt reduction and desalination, the treated concentrated solution enters the underground water bin, and the permeate is used for emulsion preparation water and electromechanical device circulation cooling.
For the water with higher water quality requirements such as emulsion preparation and electromechanical circulating cooling, a third security filtration and reverse osmosis treatment working section is additionally arranged in front of a water terminal to desalt and purify the water supply in an underground water supply network, the salt content of the effluent can be ensured to be not higher than 50mg/L by 95 percent of desalination rate, and all water quality standards of mine production can be completely met.
Preferably, in step S03, the wastewater generated by the emulsion preparation and the electromechanical device enters the downhole sump.
Preferably, in the step S02, when the salt content range of the mine water is 2000mg/L to 3000mg/L, the desalination rate of the nanofiltration equipment is more than 67%, and the recovery rate is less than 90%, and when the salt content range of the mine water is less than 2000mg/L, the desalination rate of the nanofiltration equipment is more 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 desalination rate is recommended to be 70%, the recovery rate is recommended to be 90%, a high water yield is ensured, and effluent can retain beneficial ions while removing most pollutants; the selective range of the reverse osmosis desalination rate is more than 80%, the selective range of the recovery rate is more than 50%, the selective range of the reverse osmosis desalination rate is preferably 95%, the recovery rate is preferably 80%, and ions in water can be effectively removed while the high water yield is ensured.
The invention has the advantages that:
(1) The mine water is precipitated and suspended matters are removed through pretreatment, the salt content of the concentrated solution treated by primary precision 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 fighting and the like, the concentrated water is not required to be treated by processes of evaporative crystallization and the like, the investment cost is reduced, meanwhile, the generation of dangerous wastes, such as miscellaneous salts and the like, is avoided, the economic and environmental benefits are good, and the permeate liquid enters a clear water bin to be used as a main production and living water source of a mine; the water in the clear water bin is provided with three water paths, and the clear water bin can be directly used or used after being treated according to different use occasions. By adopting the method provided by the application, the salt content of the water in the clean water bin can be controlled within 1000mg/L, the reuse water quality of the mine water is improved, the influences of corrosion, scaling and the like caused by high salinity and high scaling ions are reduced, the maintenance and the repair of equipment, pipe networks and other mine production are reduced, and the comprehensive utilization of the mine water resources is powerfully promoted while the mine production is promoted; and the water in the clean water bin is further treated or directly used, so that the clean water bin is applied to different occasions, the water utilization of various aspects of a mine is met, and the utilization rate of the mine water is further improved.
(2) Aiming at the brackish mine water with the salt content concentration range of 1000 mg/L-3000 mg/L, the invention utilizes the advantages of nanofiltration technology of ion selectivity, moderate interception relative molecular weight, low operation pressure and large flux to carry out salt reduction and desalination on the brackish mine water, the salt content of the outlet water after nanofiltration treatment is less than 1000mg/L, and simultaneously, the invention basically does not contain sulfate, the content of calcium and magnesium ions is greatly reduced compared with the original water, the invention can effectively reduce the influence of corrosion, structure, blockage and the like of the water body on pipelines and equipment, and can also meet the requirements of related discharge standards; although the salt content of the concentrated water is relatively high, 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 can be suitable for production activities such as underground grouting and the like and realize the full utilization of nanofiltration concentrated water;
(3) When the mine water is less 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 completely utilizes the mine water, water sources such as surface water or shallow underground water and the like are not needed, and redundant mine drainage can meet the requirements of related environmental protection standards;
(4) For the water with higher water quality requirements such as emulsion preparation and electromechanical circulating cooling, a third security filtration and reverse osmosis treatment working section is additionally arranged in front of a water terminal to desalt and purify the water supply in an underground water supply network, the salt content of the effluent can be ensured to be not higher than 50mg/L by 95 percent of desalination rate, and all water quality standards of mine production can be completely met;
(5) The desalination rate of the secondary nanofiltration equipment is more than 50 percent, the recovery rate is less than 95 percent, the desalination rate is recommended to be 70 percent, the recovery rate is recommended to be 90 percent, the high water yield is ensured, and effluent can remove most pollutants and simultaneously can retain beneficial ions; the selective range of the reverse osmosis desalination rate is more than 80%, the selective range of the recovery rate is more than 50%, the selective range of the reverse osmosis desalination rate is preferably 95%, the recovery rate is preferably 80%, and ions in water can be effectively removed while the high water yield is ensured.
Drawings
FIG. 1 is a schematic effluent diagram of a method of treating brackish well water from a coal mine according to an embodiment of the present invention;
reference numbers in the figures: 1. a downhole sump; 2. a pre-settling regulating tank; 3. a high-efficiency clarification tank; 4. a sand filter; 5. a lamination filter; 6. a clear water bin; 7. a downhole water supply network;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
as shown in figure 1, the method for treating brackish well water in coal mines comprises
Step S01: and (2) pretreatment, namely, feeding water in the underground water sump 1 into a pre-settling regulating tank 2 through a lifting pump for settling treatment, feeding settled clear water into a high-efficiency clarification 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 within the range of 1000 mg/L-3000 mg/L, and the salt content belongs to the category of brackish water. The pre-settling regulating tank 2 has the functions of regulating water quantity and settling at the front end of water treatment in mine drainage treatment, and sludge with larger mass sinks at the bottom of the tank and is provided with a sludge discharge facility.
The high-efficiency clarification tank 3 is a high-composite integrated flocculation/sedimentation/concentration tank, and can be obtained by adopting 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 zone is provided with a rapid mechanical stirrer for rapidly mixing the added flocculating agent, and the flocculating agent adopts aluminum salt or ferric salt; specifically, water in the pre-settling regulating tank 2 is introduced into a reaction tank, the water in the reaction tank is uniformly mixed through an impeller, and a proper amount of coagulant aid is added to generate a large amount of alum floc; the alum blossom is slowly gathered into sludge at the bottom of the sedimentation/concentration area and concentrated; the clean water is collected by the inclined tube separation area.
Step S02: performing salt reduction treatment, wherein the mine water after removing suspended matters sequentially enters a first safety filter and a nanofiltration device, a concentrated solution treated by the nanofiltration device is used for grouting and fire fighting, and a treated permeate liquid enters a clear water bin 6;
aiming at the brackish mine water with the salt content concentration range of 1000 mg/L-3000 mg/L, the method utilizes the advantages of the nanofiltration technology of ion selectivity, moderate intercepted relative molecular weight, low operation pressure and large flux to carry out salt reduction and desalination on the brackish mine water, the salt content of the permeate liquid after nanofiltration treatment is less than 1000mg/L, and simultaneously the permeate liquid basically does not contain sulfate, the content of calcium and magnesium ions is greatly reduced compared with the original water, the influences of corrosion, structure, blockage and the like of a water body on pipelines and equipment can be effectively reduced, and meanwhile, the requirements of related discharge standards can be met; although the salt content of the concentrated solution is relatively high, the salt content of the concentrated solution is less than 10000mg/L basically through controlling and adjusting parameters such as desalination rate, recovery rate and the like, and the method is suitable for production activities such as underground grouting and the like and realizes the full utilization of nanofiltration concentrated water.
When the salt content of the mine water is in the range of 2000-3000 mg/L, the selective range of the nanofiltration desalination rate is more than 67%, the selective range of the recovery rate is less than 90%, and the selective range of the nanofiltration desalination rate 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 nanofiltration desalination rate is more than 50 percent, the selective range of the recovery rate is less than 90 percent, and the selective range of the nanofiltration desalination rate is 60 percent and the recovery rate is 80 percent.
Step S03: the water in the clear water bin 6 comprises three water paths;
the first water path 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-settling regulating tank 2 again, and the treated permeate liquid is disinfected and used as domestic water;
specifically, the first water channel is that water in the clear water bin 6 sequentially passes through a second security filter and a second-stage nanofiltration device, the treated concentrated solution enters the pre-precipitation regulating tank 2 again, and the treated permeation solution is disinfected by a chlorine dioxide generator and used as domestic water.
When the effluent after nanofiltration treatment is used as domestic water, a second security filter, secondary nanofiltration and disinfection treatment section is additionally arranged, ions in the water can be further removed, the water quality can meet the requirements of relevant standards, the salt content of the effluent can be guaranteed to be less than 300mg/L by 70 percent of desalination rate, and the water quality standard of the domestic water can be met.
The desalination rate of the secondary nanofiltration equipment is more than 50 percent, the recovery rate is less than 95 percent, the desalination rate is recommended to be selected to be 70 percent, the recovery rate is recommended to be 90 percent, the higher water yield is ensured, and the effluent can retain beneficial ions while removing most pollutants.
The second water path is that the water in the clear water bin 6 is directly used as water for production activities; in particular, the water can be directly used for spraying, dust settling, fire extinguishing and flushing production activities.
The third water path 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 again, the treated concentrated solution enters the underground water bin 1, and the permeate liquid is used for cooling equipment.
Specifically, the third water path 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 sequentially passes through a third security filter and a reverse osmosis device 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 emulsion preparation water and electromechanical device circulating cooling.
For the water with higher water quality requirements such as emulsion preparation and electromechanical circulating cooling, a third security filtration and reverse osmosis treatment working section is additionally arranged in front of a water terminal to desalt and purify the water supply in the underground water supply network 7, the salt content of the effluent can be ensured to be not higher than 50mg/L by 95 percent of desalination rate, and all water quality standards of mine production can be completely met.
Wastewater generated by the emulsion preparation and the electromechanical equipment enters the underground sump 1.
The reverse osmosis equipment has the optional range of the desalination rate of more than 80 percent and the optional range of the recovery rate of more than 50 percent, the desalination rate of 95 percent and the recovery rate of 80 percent are recommended to be selected, and ions in water can be effectively removed while the high water yield is ensured.
The water in the underground water supply pipe network 7 can also be directly used for spraying, dedusting, extinguishing fire and flushing.
In the embodiment, the mine water is precipitated and suspended matters are removed through pretreatment, the salt content of the concentrated solution treated by primary precise filtration and nanofiltration equipment is controlled and adjusted by parameters such as desalination rate, recovery rate and the like, the salt content of the concentrated water is less than 10000mg/L, the concentrated solution 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 does not need to be treated by processes such as evaporative crystallization and the like, the investment cost is reduced, meanwhile, the generation of dangerous wastes such as miscellaneous salts and the like is also avoided, good economic and environmental benefits are realized, and the permeate liquid enters the clear water bin 6 to serve as a main water source for production and living of a mine; the water in the clear water bin 6 is provided with three water paths, and the clear water bin can be directly used or used after being treated according to the use of different occasions. By adopting the method provided by the application, the salt content of the water in the clear water bin 6 can be controlled within 1000mg/L, the mine water reuse water quality is improved, the influences of corrosion, scaling and the like caused by high salinity and high scaling ions are reduced, the maintenance and the repair of equipment, pipe networks and other mine production are reduced, and the comprehensive utilization of mine water resources is powerfully promoted while the mine production is promoted; and the water in the clear water bin 6 is further treated or directly used, so that the method is applied to different occasions, the water utilization of various aspects of mines is met, and the utilization rate of the mine water is further improved.
Example 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 volume exceeds the total quantity of the live water produced by the mine.
When the mine water is less 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 and the like are not needed, and redundant mine drainage can meet the requirements of related environmental protection standards.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The method for treating the brackish well water of the coal mine is characterized by comprising
Step S01: pretreating, namely precipitating mine water in the underground water sump and removing suspended matters;
step S02: performing salt reduction treatment, namely sequentially performing primary precision filtration and nanofiltration treatment on the pretreated water by using nanofiltration equipment, wherein the treated concentrated solution is used for producing active water, and the treated permeate enters a clear water bin;
step S03: the water in the clean water bin comprises at least three water paths, the first water path is that the water in the clean water bin sequentially passes through secondary fine filtration and secondary nanofiltration equipment, the treated concentrated solution enters a pre-settling regulating tank again, and the treated permeate liquid is disinfected and used as domestic water;
the second water path is that the water in the clear water bin is directly used as water for production activities;
and the third water path 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 again, the treated concentrated solution enters the underground water bin, and the permeate is used for equipment cooling, emulsion preparation and spray dust reduction.
2. The method for treating brackish well water for coal mines as claimed in claim 1, wherein in step S01, the water in the underground sump is pumped into a pre-settling tank through a lift pump for settling treatment, the settled clean water is pumped into a high efficiency clarification tank for removing suspended matters and chemical oxygen demand, and then the suspended matters are further removed through a sand filter and a laminated filter in sequence.
3. The coal mine brackish well water treatment method according to claim 2, characterized in that in the step S02, the mine water from which suspended matters are removed sequentially enters a first security filter and a nanofiltration device.
4. The method for treating brackish well water for coal mines as claimed in claim 3, wherein in step S02 the treated concentrate is used for grouting and fire fighting production activities.
5. The method for treating brackish well water for coal mines as claimed in claim 1, wherein in step S03, the water entering the clean water silo is discharged when the amount of mine water exceeds the total amount of live water produced by mines.
6. The coal mine brackish well water treatment method according to claim 1, wherein in the step S03, the water in the clean water sump passes through the second security filter and the second-stage nanofiltration device in sequence in the first water path, the treated concentrated solution enters the pre-settling tank again, and the treated permeate liquid is disinfected by a chlorine dioxide generator to be used as domestic water.
7. The method for treating brackish coal mine well water as claimed in claim 1, wherein in step S03, the water in the second water path is clean water, and is directly used as water for spraying, dedusting, extinguishing and flushing production activities.
8. The method for treating brackish well water for coal mines as claimed in claim 1, wherein in step S03, the water in the clean water bin enters the downhole water supply network as a third water path, the water in the downhole water supply network sequentially passes through the third security filter and the reverse osmosis device for salt reduction and desalination, the treated concentrated solution enters the downhole water bin, and the permeate is used for the water for emulsion preparation and the cyclic cooling of the electromechanical device.
9. The method for treating brackish coal mine well water as claimed in claim 8, wherein in step S03, wastewater generated by the emulsion configuration and the electromechanical device enters the underground sump.
10. The coal mine brackish well water treatment method as claimed in claim 1, wherein in the step S02, when the salt content of the mine water is in a range of 2000mg/L to 3000mg/L, the desalination rate of the nanofiltration device is more than 67%, and the recovery rate is less than 90%, and when the salt content of the mine water is less than 2000mg/L, the desalination rate of the nanofiltration device is more than 50%, and the recovery rate is less than 90%; in the step S03, the desalting rate of the secondary nanofiltration equipment is more than 50%, and the recovery rate is less than 95%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210921049.5A CN115259460B (en) | 2022-08-02 | 2022-08-02 | Treatment method of brackish mine water of coal mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210921049.5A CN115259460B (en) | 2022-08-02 | 2022-08-02 | Treatment method of brackish mine water of coal mine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115259460A true CN115259460A (en) | 2022-11-01 |
| CN115259460B CN115259460B (en) | 2024-05-14 |
Family
ID=83746863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210921049.5A Active CN115259460B (en) | 2022-08-02 | 2022-08-02 | Treatment method of brackish mine water of coal mine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115259460B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201380045Y (en) * | 2009-02-24 | 2010-01-13 | 淮南矿业(集团)有限责任公司 | Pretreatment device and reverse osmosis desalination apparatus for desalination of mine water |
| EP2537813A1 (en) * | 2011-06-22 | 2012-12-26 | Siemens Aktiengesellschaft | Method for processing mine waters |
| CN105461104A (en) * | 2015-11-06 | 2016-04-06 | 太原理工大学 | Treatment process of concentrated salt wastewater produced by coal chemical industry |
| CN208577551U (en) * | 2018-06-28 | 2019-03-05 | 山西正企环境技术有限公司 | A kind for the treatment of mine drainage is the nanofiltration device of drinking water source |
| CN210528679U (en) * | 2019-08-30 | 2020-05-15 | 河南海天环境科技有限公司 | Mine water resourceful treatment recycling system |
| CN111362453A (en) * | 2020-03-18 | 2020-07-03 | 北京百灵天地环保科技股份有限公司 | High-salinity coal mine water standard-reaching treatment and resource utilization device and use method thereof |
| CN112358103A (en) * | 2020-09-28 | 2021-02-12 | 内蒙古久科康瑞环保科技有限公司 | Nanofiltration device, and nanofiltration pre-mode mine water treatment system and process |
| CN113429011A (en) * | 2021-06-03 | 2021-09-24 | 河北钢铁集团沙河中关铁矿有限公司 | Comprehensive treatment method for mine water of large water mine |
-
2022
- 2022-08-02 CN CN202210921049.5A patent/CN115259460B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201380045Y (en) * | 2009-02-24 | 2010-01-13 | 淮南矿业(集团)有限责任公司 | Pretreatment device and reverse osmosis desalination apparatus for desalination of mine water |
| EP2537813A1 (en) * | 2011-06-22 | 2012-12-26 | Siemens Aktiengesellschaft | Method for processing mine waters |
| CN103635436A (en) * | 2011-06-22 | 2014-03-12 | 西门子公司 | Process for working up mine water |
| CN105461104A (en) * | 2015-11-06 | 2016-04-06 | 太原理工大学 | Treatment process of concentrated salt wastewater produced by coal chemical industry |
| CN208577551U (en) * | 2018-06-28 | 2019-03-05 | 山西正企环境技术有限公司 | A kind for the treatment of mine drainage is the nanofiltration device of drinking water source |
| CN210528679U (en) * | 2019-08-30 | 2020-05-15 | 河南海天环境科技有限公司 | Mine water resourceful treatment recycling system |
| CN111362453A (en) * | 2020-03-18 | 2020-07-03 | 北京百灵天地环保科技股份有限公司 | High-salinity coal mine water standard-reaching treatment and resource utilization device and use method thereof |
| CN112358103A (en) * | 2020-09-28 | 2021-02-12 | 内蒙古久科康瑞环保科技有限公司 | Nanofiltration device, and nanofiltration pre-mode mine water treatment system and process |
| CN113429011A (en) * | 2021-06-03 | 2021-09-24 | 河北钢铁集团沙河中关铁矿有限公司 | Comprehensive treatment method for mine water of large water mine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115259460B (en) | 2024-05-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Subramani et al. | Impact of intermediate concentrate softening on feed water recovery of reverse osmosis process during treatment of mining contaminated groundwater | |
| CN103224297B (en) | Titanium white production waste water recycling process | |
| CN111039477A (en) | Method for recycling and comprehensively utilizing reverse osmosis concentrated water of coking wastewater | |
| US8623214B2 (en) | Desalination system and method for integrated treatment of brackish concentrate and seawater | |
| CN105565569A (en) | Intensified deep concentration system for high-salt-content industrial wastewater and technology thereof | |
| CN102417253B (en) | In-depth treatment zero-discharge recovery equipment for heavy metal waste water | |
| CN104276711A (en) | Reverse osmosis membrane treatment process for recycling industrial sewage and realizing zero release | |
| CN213085655U (en) | Low-cost mine water purification treatment system | |
| CN108017213A (en) | A kind of high slat-containing wastewater recycling treatment system and technique | |
| CN111285531A (en) | Method and system for concentrating high-salinity mine water | |
| CN112794500B (en) | Coking wastewater strong brine near-zero emission treatment system and treatment method thereof | |
| CN104030483A (en) | Treatment method for recycling power plant circulating water sewage | |
| CN104108813A (en) | Refining and chemical sewage desalting integrated treatment process and device | |
| CN111170524A (en) | Reverse osmosis concentrated water recycling method | |
| CN112047553A (en) | PTA high-salinity wastewater treatment, reuse and zero-discharge system and method | |
| CN113045059A (en) | Treatment system and treatment process for realizing zero discharge of wastewater by full-membrane method | |
| CN111875142A (en) | Zero discharge system and process for salt-containing wastewater of power plant | |
| CN109422383A (en) | A kind of Treated sewage reusing treatment process | |
| CN216472672U (en) | Wastewater zero-discharge treatment system | |
| CN206901956U (en) | GTCC power plant wastewater zero discharge processing unit | |
| CN115259460B (en) | Treatment method of brackish mine water of coal mine | |
| CN109179739A (en) | A kind of strong brine zero discharge treatment production line | |
| CN110921948A (en) | Treatment device and treatment method for high-salinity industrial wastewater | |
| CN212954702U (en) | Zero discharging equipment of power plant's high salt waste water | |
| CN210595643U (en) | System for zero release of power plant's whole factory waste water and resource utilization |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |