CN115072928A - Mine water advanced treatment system and method - Google Patents
Mine water advanced treatment system and method Download PDFInfo
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- CN115072928A CN115072928A CN202210996710.9A CN202210996710A CN115072928A CN 115072928 A CN115072928 A CN 115072928A CN 202210996710 A CN202210996710 A CN 202210996710A CN 115072928 A CN115072928 A CN 115072928A
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Images
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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- 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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F2001/5218—Crystallization
-
- 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
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Engineering & Computer Science (AREA)
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a mine water advanced treatment system which comprises an underground advanced treatment system and an overground advanced treatment system which are mutually communicated, so that the zero discharge of salt separation crystallization of mine water is realized, and the produced high-quality reuse water can be used by nearby industry and agriculture or can reach the standard for discharge. The invention also discloses a mine water advanced treatment method, so that the desalted water and the filtered purified water after the mine water is treated completely meet the requirements of various underground water, water supply to the underground water is not needed through an underground water treatment process unit, the water quantity of the mine water pumped to the ground is effectively reduced, the investment and the operating cost of the underground water treatment are greatly reduced, and the energy consumption of water delivery is reduced.
Description
Technical Field
The invention relates to the technical field of mine water treatment, in particular to a mine water advanced treatment system and a mine water advanced treatment method.
Background
As is known, coal is an important energy resource in China, a large amount of mine water is generated in the mining process, machines are in contact with coal seams and rock stratums, and a series of physical, chemical and biochemical reactions occur under the influence of human activities. Therefore, the quality of the mine water has obvious characteristics in the coal industry: the content of suspended matters in the mine water containing the suspended matters is far higher than that of surface water; the particle size of the contained suspended matters is small, the specific gravity is light, the sedimentation speed is slow, and the coagulation effect is poor; some mine water also contains organic pollutants such as waste engine oil and emulsified oil; and contains much higher total ion content than the general surface water. Therefore, the mine water can not meet the requirements of industrial production and use, and can not meet the requirements of domestic water. If the mine water is directly discharged to the ground, water and soil loss, salinization, vegetation damage and the like can be caused, and great influence is brought to the local ecological environment protection.
At present, mine water needs to be purified after being pumped to the ground, but the problems of complex treatment process, long treatment period and high treatment cost exist, and part of the mine water after being treated on the ground needs to be returned to the underground for use, so that the repeated promotion of the mine water increases a lot of energy consumption, reduces the treatment and use efficiency of the mine water, and can not meet the requirements of efficient and economic environment-friendly treatment of the mine water.
Disclosure of Invention
Aiming at the problems in the prior art, the invention discloses a mine water advanced treatment system which comprises an underground advanced treatment system and an overground advanced treatment system which are communicated with each other. The underground deep treatment system comprises an underground mining solid-liquid separation unit, an underground adjusting primary sedimentation unit, an underground tubular filtering unit and an underground reverse osmosis unit which are communicated in sequence, wherein the underground adjusting primary sedimentation unit and the underground tubular filtering unit are both communicated with an underground sludge dewatering unit, and the underground adjusting primary sedimentation unit is also communicated with an above-ground deep treatment system. The overground deep treatment system comprises an overground adjusting unit, an overground softening reaction and precipitation unit, an overground filtering unit, an overground ultrafiltration unit, an overground primary reverse osmosis unit, an overground ion exchange unit, an overground secondary reverse osmosis unit, an overground nanofiltration unit, an overground tertiary reverse osmosis unit, an overground salt evaporation and crystallization unit and a mother liquor treatment unit which are sequentially communicated, wherein the overground adjusting unit is communicated with the underground adjusting primary precipitation unit, the overground softening reaction and precipitation unit is also communicated with the overground sludge dehydration unit, the overground filtering unit, the overground primary reverse osmosis unit, the overground secondary reverse osmosis unit and the overground tertiary reverse osmosis unit are respectively communicated with an overground reuse water pool, the overground nanofiltration unit is also communicated with the overground nitrate evaporation and crystallization unit, and the overground nitrate evaporation and crystallization unit is further communicated with the mother liquor treatment unit.
As a further improvement of the invention, the solid-liquid separation equipment in the solid-liquid separation unit for the underground mine is selected from the following: one or more of a grid type solid-liquid separation device, a vibrating screen type solid-liquid separation device, a centrifugal type solid-liquid separation device and a sedimentation type solid-liquid separation device.
As a further improvement of the invention, the conditioning precipitation equipment in the downhole conditioning primary precipitation unit is selected from the group consisting of: one or more of a horizontal sedimentation tank, a clarification tank, a radial sedimentation tank, a mechanical stirring and regulating tank and an aeration stirring and regulating tank.
As a further development of the invention, the conditioning precipitation equipment in the above-ground conditioning unit is selected from the group consisting of: one or more of a horizontal sedimentation tank, a clarification tank, a radial sedimentation tank, a mechanical stirring and regulating tank and an aeration stirring and regulating tank.
As a further improvement of the invention, the downhole tubular filter unit adopts coagulation reaction, and the filter device in the downhole tubular filter unit is selected from the following components: microfiltration or ultrafiltration devices.
As a further improvement of the invention, the filtering membrane in the filtering device is selected from: inorganic ceramic membranes or organic material membranes.
As a further improvement of the invention, the precipitation pool in the above-ground softening reaction precipitation unit is selected from: a high-density sedimentation tank or a mechanical clarification tank.
As a further development of the invention, the filter in the above-ground filtration unit is selected from the group consisting of: one or more of a V-shaped filter chamber, a multi-medium filter, an activated carbon filter, a valveless filter chamber, an external pressure type ultrafilter and an immersion type ultrafilter.
As a further development of the invention, the filter in the above-ground ultrafiltration unit is selected from the group consisting of: one or more of a V-shaped filter chamber, a multi-medium filter, an activated carbon filter, a valveless filter chamber, an external pressure type ultrafilter and an immersion type ultrafilter.
As a further improvement of the invention, the reverse osmosis membranes in the underground reverse osmosis unit, the overground first-stage reverse osmosis unit, the overground second-stage reverse osmosis unit and the overground third-stage reverse osmosis unit are all selected from the following groups: one or more of a brackish water reverse osmosis membrane, a sea water reverse osmosis membrane and a high pressure reverse osmosis membrane.
As a further improvement of the invention, the water inlet power in the downhole tubular filtration unit, the downhole reverse osmosis unit, the overground first-stage reverse osmosis unit, the overground second-stage reverse osmosis unit and the overground third-stage reverse osmosis unit is selected from the following power: centrifugal pump power or water inlet power formed by elevation difference.
As a further improvement of the invention, the aboveground ion exchange unit adopts a weak acid cation bed and is filled with weak acid resin or chelating resin.
As a further improvement of the invention, the nanofiltration membranes in the above-ground nanofiltration unit are selected from: a common nanofiltration membrane or a high pressure nanofiltration membrane.
As a further improvement of the invention, the evaporators in the above-ground salt evaporation crystallization unit and the above-ground saltpeter evaporation crystallization unit are selected from the following: one or more combined evaporators selected from the group consisting of: one or more of a multiple effect evaporator or an MVR evaporator.
As a further improvement of the invention, the treatment device in the mother liquor treatment unit is selected from: one or more of a single-effect evaporator, a roller drying device, a spray drying device, a submerged combustion device and a mother liquor drying device.
The invention also provides a treatment method of the mine water deep treatment system, which comprises the following steps:
step one, mine water flows into an underground adjusting primary sedimentation unit after particulate matters are removed by an underground mining solid-liquid separation unit, and produced slag is transported out; after the suspended matters are settled in the primary settling unit, supernatant is pumped into the underground tubular filtering unit, and the suspended matters in the mine water are removed through coagulation reaction precipitation and membrane filtration of the tubular membrane unit to meet the water inlet requirement of reverse osmosis; pumping part of produced water filtered by the tubular filtering unit into an underground reverse osmosis unit, wherein the produced water of the underground reverse osmosis unit is used for desalted water of underground equipment; part of produced water of the underground tubular filtering unit and concentrated water of the underground reverse osmosis unit are used for underground spraying, ash removal, fire prevention and filling; sludge generated by the underground adjusting primary sedimentation unit and the underground tubular filtering unit is conveyed to the underground sludge dewatering unit for dewatering and then is transported outside;
step two, the residual mine water of the underground adjusting primary sedimentation unit is pumped to an overground adjusting unit through a lifting pump; then the mixture is conveyed to an above-ground softening reaction precipitation unit by an above-ground adjusting unit, and the above-ground softening reaction precipitation unit is softened and de-hardened by adding medicine and then is conveyed to an above-ground filtering unit and an above-ground ultrafiltration unit to be filtered to remove suspended matters; the produced water of the above-ground ultrafiltration unit is pumped to the above-ground first-stage reverse osmosis unit, the produced water enters an above-ground reuse water pool after desalination through a reverse osmosis membrane, and concentrated water is pumped into the above-ground ion exchange unit; the overground ion exchange unit removes the residual hardness in the mine water through the adsorption of resin; the outlet water of the overground ion exchange unit is pumped to an overground secondary reverse osmosis unit, the produced water after desalination by a reverse osmosis membrane enters an overground reuse water pool, concentrated water is pumped into an overground nanofiltration unit, a nanofiltration device separates divalent ions, the nanofiltration produced water is further concentrated by an overground tertiary reverse osmosis unit, the produced water of the overground tertiary reverse osmosis unit enters the overground reuse water pool, and the concentrated water of the overground tertiary reverse osmosis unit is sent to an overground salt evaporation crystallization unit for concentration, evaporation and crystallization to produce a sodium chloride product; concentrated water of the ground nanofiltration unit is sent to a ground nitrate evaporative crystallization unit to be concentrated, evaporated and crystallized to generate a sodium sulfate product; finally, mother liquor generated by the above-ground salt evaporation crystallization unit and the above-ground saltpeter evaporation crystallization unit is sent to a mother liquor treatment unit to generate miscellaneous salt, so that zero emission of mine water is realized;
step three, the effluent of the overground reuse water pool is used for nearby agriculture and industry or is discharged after reaching the standard;
and step four, conveying the sludge generated by the ground softening reaction precipitation unit to a ground sludge dehydration unit for dehydration and then transporting the sludge outside.
Compared with the prior art, the mine water deep treatment system disclosed by the invention has the advantages that the desalted water and the filtered purified water after the mine water is treated can completely meet the requirements of various underground water through the water treatment process unit designed underground, the underground water is not required to be supplied through the underground water treatment process unit, the water quantity of the mine water pumped to the ground is effectively reduced, the investment and the operating cost of the underground water treatment are greatly reduced, and the energy consumption of water delivery is reduced; and the water treatment process unit designed on the ground ensures that the zero discharge of salt separation crystallization of the mine water is realized, and the produced high-quality reuse water can be used for nearby industry and agriculture or can reach the standard for discharge. The mine water advanced treatment method disclosed by the invention can completely meet the requirements of efficient and economic mine water environment-friendly treatment and recycling.
Drawings
FIG. 1 is a schematic diagram of a mine water advanced treatment system according to an embodiment of the invention;
fig. 2 is a schematic flow chart of a mine water deep treatment method disclosed in an embodiment of the invention.
In the figure:
1: a solid-liquid separation unit for underground mining; 2: adjusting a primary settling unit underground; 3: a downhole tubular filtration unit; 4: a downhole reverse osmosis unit; 5: an underground sludge dewatering unit; 6: an above-ground adjusting unit; 7: an aboveground softening reaction precipitation unit; 8: an above-ground filtration unit; 9: an above-ground ultrafiltration unit; 10: an aboveground first-stage reverse osmosis unit; 11: an above-ground ion exchange unit; 12: an aboveground secondary reverse osmosis unit; 13: an above-ground nanofiltration unit; 14: an aboveground three-stage reverse osmosis unit; 15: an above-ground salt evaporative crystallization unit; 16: an overground nitre evaporation crystallization unit; 17: a mother liquor treatment unit; 18: an overground reuse water pool; 19: an overground sludge dewatering unit.
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 drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "communication" means not only connection by a pipe but also connection by a weir.
Embodiment I, mine water advanced treatment system
As shown in FIG. 1, the invention provides a mine water advanced treatment system, which comprises a downhole advanced treatment system and an overground advanced treatment system which are communicated with each other;
the underground depth treatment system comprises an underground mining solid-liquid separation unit 1, an underground adjusting primary sedimentation unit 2, an underground tubular filtering unit 3 and an underground reverse osmosis unit 4 which are communicated in sequence, wherein the underground adjusting primary sedimentation unit 2 and the underground tubular filtering unit 3 are both communicated with an underground sludge dewatering unit 5, and the underground adjusting primary sedimentation unit 2 is also communicated with the above-ground depth treatment system.
Further, the solid-liquid separation equipment in the solid-liquid separation unit 1 for the underground mine is selected from: one or more of grid type solid-liquid separation equipment, vibration screen type solid-liquid separation equipment, centrifugal type solid-liquid separation equipment and sedimentation type solid-liquid separation equipment. The conditioning precipitation equipment in the downhole conditioning primary precipitation unit 2 is selected from: one or more of a horizontal flow sedimentation tank, a clarification tank, a radial flow sedimentation tank, a mechanical stirring and regulating tank and an aeration stirring and regulating tank. The downhole tubular filtering unit 3 adopts coagulation reaction, and a filtering device in the downhole tubular filtering unit 3 is selected from: a microfiltration or ultrafiltration device, wherein the filtration membrane in the filtration device is selected from the group consisting of: inorganic ceramic membranes or organic material membranes. The water input power in the downhole tubular filtration unit 3 and the downhole reverse osmosis unit 4 is selected from: centrifugal pump power or water inlet power formed by elevation difference. The reverse osmosis membrane in the downhole reverse osmosis unit 4 is selected from: one or more of a brackish water reverse osmosis membrane, a sea water reverse osmosis membrane and a high pressure reverse osmosis membrane.
The overground advanced treatment system comprises an overground adjusting unit 6, an overground softening reaction and precipitation unit 7, an overground filtering unit 8, an overground ultrafiltration unit 9, an overground primary reverse osmosis unit 10, an overground ion exchange unit 11, an overground secondary reverse osmosis unit 12, an overground nanofiltration unit 13, an overground tertiary reverse osmosis unit 14, an overground salt evaporation and crystallization unit 15 and a mother liquor treatment unit 17 which are communicated in sequence, the ground-level adjusting unit 6 is communicated with the underground adjusting primary sedimentation unit 2, the ground-level softening reaction sedimentation unit 7 is also communicated with a ground-level sludge dewatering unit 19, the ground-level filtering unit 8, the ground-level first-level reverse osmosis unit 10, the ground-level second-level reverse osmosis unit 12 and the ground-level third-level reverse osmosis unit 14 are respectively communicated with a ground-level reuse water pool 18, the ground-level nanofiltration unit 13 is also communicated with a ground-level saltpeter evaporation crystallization unit 16, and the ground-level saltpeter evaporation crystallization unit 16 is further communicated with a mother liquor treatment unit 17.
Further, the conditioning precipitation equipment in the above-ground conditioning unit 6 is selected from: one or more of a horizontal sedimentation tank, a clarification tank, a radial sedimentation tank, a mechanical stirring and regulating tank and an aeration stirring and regulating tank. The settling pond in the above-ground softening reaction settling unit 7 is selected from: a high-density sedimentation tank or a mechanical clarification tank. The filters in the above-ground filtering unit 8 are selected from: one or more of a V-shaped filter chamber, a multi-medium filter, an activated carbon filter, a valveless filter chamber, an external pressure type ultrafilter and an immersion type ultrafilter. The filters in the above ground ultrafiltration unit 9 are selected from: one or more of a V-shaped filter chamber, a multi-medium filter, an activated carbon filter, a valveless filter chamber, an external pressure type ultrafilter and an immersion type ultrafilter. The reverse osmosis membranes in the above-ground first-stage reverse osmosis unit 10, the above-ground second-stage reverse osmosis unit 12 and the above-ground third-stage reverse osmosis unit 14 are all selected from the group consisting of: one or more of a brackish water reverse osmosis membrane, a sea water reverse osmosis membrane and a high pressure reverse osmosis membrane. The water inlet power in the ground first-stage reverse osmosis unit 10, the ground second-stage reverse osmosis unit 12 and the ground third-stage reverse osmosis unit 14 is selected from the following power: centrifugal pump power or water inlet power formed by elevation difference. The above-ground ion exchange unit 11 adopts a weak acid cation bed and is filled with weak acid resin or chelating resin. The nanofiltration membranes in the above-ground nanofiltration unit 13 are selected from: a common nanofiltration membrane or a high pressure nanofiltration membrane. The evaporators in the above-ground salt evaporation crystallization unit 15 and the above-ground nitre evaporation crystallization unit 16 are selected from the following: one or more combined evaporators selected from the group consisting of: one or more of a multiple effect evaporator or an MVR evaporator. The treatment means in the mother liquor treatment unit 17 are selected from: one or more of a single-effect evaporator, a roller drying device, a spray drying device, a submerged combustion device and a mother liquor drying device.
Second embodiment, a mine water advanced treatment method
As shown in fig. 2, the invention provides a mine water advanced treatment method, which comprises the following steps:
firstly, mine water flows into an underground adjusting primary sedimentation unit 2 after particulate matters are removed through an underground mining solid-liquid separation unit 1, and produced slag is transported out; after the primary sedimentation unit 2 is adjusted to settle suspended matters underground, supernatant is pumped into an underground tubular filtering unit 3, and suspended matters in mine water are removed through coagulation reaction sedimentation and membrane filtration of a tubular membrane unit to meet the water inlet requirement of reverse osmosis; and part of produced water filtered by the underground tubular filtering unit 3 is pumped into an underground reverse osmosis unit 4, and the water produced by the underground reverse osmosis unit 4 is used for desalted water of underground equipment. The desalted water used for the underground equipment reaches the water quality standard of comprehensive water used for equipment such as coal mining machines, hydraulic supports and the like in design Specification for fire fighting and water spraying under coal mines GB50383-2006 through detection. Part of the produced water of the downhole tubular filtration unit 3 and the concentrated water of the downhole reverse osmosis unit 4 are used for downhole spraying, ash removal, fire prevention and filling. The concentrated water for underground spraying, ash removal, fire prevention and filling is detected to reach the water quality standard of underground fire-fighting sprinkler in the design specification GB50383-2006 of underground fire-fighting and sprinkler of coal mines. And the sludge generated by the underground adjusting primary sedimentation unit 2 and the underground tubular filtering unit 3 is sent to an underground sludge dewatering unit 5 for dewatering and then is transported out.
Step two, the residual mine water of the underground adjusting primary sedimentation unit 2 is pumped to an overground adjusting unit 6 through a lifting pump; then the mixture is conveyed to an above-ground softening reaction precipitation unit 7 by an above-ground adjusting unit 6, and the above-ground softening reaction precipitation unit 7 is softened by adding medicine and then is conveyed to an above-ground filtering unit 8 and an above-ground ultrafiltration unit 9 to be filtered and remove suspended matters; the produced water of the ground ultrafiltration unit 9 is pumped to a ground primary reverse osmosis unit 10, the produced water enters a ground reuse water pool 18 after desalination through a reverse osmosis membrane, and concentrated water is pumped into a ground ion exchange unit 11; the overground ion exchange unit 11 removes the residual hardness in the mine water through the adsorption of resin; the outlet water of the overground ion exchange unit 11 is pumped to an overground second-stage reverse osmosis unit 12, the produced water after desalination by a reverse osmosis membrane enters an overground reuse water pool 18, concentrated water is pumped to an overground nanofiltration unit 13, a nanofiltration device separates divalent ions, the nanofiltration produced water is further concentrated by an overground third-stage reverse osmosis unit 14, the produced water of the overground third-stage reverse osmosis unit 14 enters the overground reuse water pool 18, and the concentrated water of the overground third-stage reverse osmosis unit 14 is sent to an overground salt evaporation crystallization unit 15 for concentration, evaporation and crystallization to produce a sodium chloride product; sending the concentrated water of the ground nanofiltration unit 13 to a ground nitrate evaporative crystallization unit 16 for concentration, evaporation and crystallization to generate a sodium sulfate product; and finally, mother liquor generated by the above-ground salt evaporation crystallization unit 15 and the above-ground saltpeter evaporation crystallization unit 16 is sent to a mother liquor treatment unit 17 to generate miscellaneous salt, so that zero emission of mine water is realized.
And step three, detecting the effluent of the above-ground reuse water pool 18 to reach the water quality standard required by the water quality standards GB/T18920 of urban sewage recycling-urban miscellaneous water quality, GB/T19923 of urban sewage recycling-industrial water quality and GB 20922 of urban sewage recycling-farmland irrigation water quality, and then supplying the effluent of the above-ground reuse water pool 18 for the use of nearby industry and agriculture or discharging the effluent after reaching the standard.
And step four, the sludge generated by the ground softening reaction precipitation unit 7 is sent to a ground sludge dehydration unit 19 for dehydration and then is transported outside.
Example III mine Water advanced treatment experiment
The daily mine water yield of a certain coal mine is about 10000m 3 And/d, the TDS of the mine water is 3000-4000 mg/L. The mine water is subjected to advanced treatment through the mine water treatment system and the mine water advanced treatment method in the first embodiment.
The treatment process is as follows:
underground mine water firstly enters an underground mine solid-liquid separation unit 1, slag is screened and removed from the mine water through a vibrating screen type solid-liquid separator, the effluent water of the separator automatically flows into an underground adjusting primary sedimentation unit 2, a primary sedimentation tank of the underground adjusting primary sedimentation unit 2 is designed into a horizontal sedimentation tank, a mud suction machine is arranged to discharge suspended matters such as coal slime and the like in the horizontal sedimentation tank into an underground sludge storage tank, the sludge storage tank is conveyed to an underground sludge dewatering unit 5 through a sludge pump, the coal slime is pressed and dewatered through a plate-and-frame filter press, and the dewatered coal slime and the slag are transported outwards together or filled underground for use.
3000m is arranged in the underground tubular filtering unit 3 3 The pipe-type membrane treatment system comprises a machine throwing flocculating agent and a coagulating agent to form flocs, a pipe-type membrane is fed into the flocs to filter and remove suspended matters in mine water, the pipe-type membrane is discharged to a sludge storage tank, and the pipe-type membrane produces 1000m of water 3 D, sending to a downhole reverse osmosis unit 4, designing the reverse osmosis recovery rate to be about 75%, and conveying the reverse osmosis desalted product to be 750m 3 The desalted water of/d is used for desalted water of underground equipment (the water quality detection result is shown in a table 1); concentrated water 250m for reverse osmosis water production 3 D and the remaining 2000m 3 The tubular membrane produced water of/d is used for underground spraying, ash removal, fire prevention, filling and the like (the water quality detection results are shown in a table 2).
Remaining 7000m downhole 3 The/d mine water is pumped to the above ground conditioning unit 6 by a lift pump. Pumping to an above-ground softening reaction sedimentation unit 7 after the aeration stirring and homogenizing of an aeration stirring adjusting pool of an above-ground adjusting unit 6, and adding liquid alkali and carbonic acid into a reaction zone of the above-ground softening reaction sedimentation unitRemoving the hardness of mine water to be below 100mg/L after using medicaments such as sodium, PFS, PAM and the like; the softened effluent sequentially flows to an above-ground filtering unit 8 and an above-ground ultrafiltration unit 9, and an immersed ultrafiltration membrane pool in the above-ground ultrafiltration unit 9 is filtered by an ultrafiltration membrane to remove suspended matters in the wastewater to be below 0.5 mg/L; 6000m 3 The water produced by the ultrafiltration is pumped into an overground first-stage reverse osmosis unit 10 for desalination, the designed recovery rate is about 75 percent, and the first-stage reverse osmosis water produced is 4500m 3 Concentrating the mine water by 4 times; first-stage reverse osmosis concentrated water of 1500m 3 D, pumping the wastewater into a weak acid cation bed in the above-ground ion exchange unit 11, and removing the hardness in the wastewater to be below 5 mg/L; the weak acid cation bed produced water is pumped into the ground second-stage reverse osmosis unit 12 for desalination, the designed recovery rate is about 60 percent, and the second-stage reverse osmosis produced water is 900m 3 Concentrating the mine water by 2.5 times; concentrated water of two-stage reverse osmosis 600m 3 D, pumping the filtrate into a nanofiltration device in the above-ground nanofiltration unit 13; sodium sulfate is mainly retained on the nanofiltration concentrated water side, sodium chloride is mainly on the nanofiltration water production side, the designed nanofiltration recovery rate is about 75 percent, and the nanofiltration water production is 450m 3 D, pumping the filtrate into an overground three-stage reverse osmosis unit 14 for desalination, wherein the designed recovery rate is about 70 percent, and the three-stage reverse osmosis water production is 315m 3 Concentrating mine water by 3.3 times; three-stage reverse osmosis concentrated water 135m 3 D, pumping the sodium chloride product into an MVR salt evaporation crystallizer in the overground salt evaporation crystallization unit 15; nanofiltration concentrated water of 150m 3 And d, pumping the sodium sulfate into an MVR sodium nitrate evaporative crystallizer in the above-ground sodium nitrate evaporative crystallization unit 16 to produce a sodium sulfate product. Finally, mother liquor of the steam devices of the above-ground salt evaporation crystallization unit 15 and the above-ground saltpeter evaporation crystallization unit 16 enters a mother liquor treatment unit 17, and is dried and dried by a roller to generate miscellaneous salt for disposal, so that zero emission of mine water is realized. Residual 1000m of submerged ultrafiltration 3 D, the total of the produced water of the evaporator condensate, the first-stage reverse osmosis produced water, the second-stage reverse osmosis produced water and the third-stage reverse osmosis produced water is about 6850m 3 And d, all the water is recycled to the above-ground recycling pool 18, and the water discharged from the above-ground recycling pool 18 (the water quality detection result is shown in a table 3) is used as the nearby greening and miscellaneous water. Sludge generated by the softening reaction sedimentation tank is discharged to an above-ground sludge storage tank, is conveyed to an above-ground plate-and-frame filter press in an above-ground sludge dewatering unit 19 by a sludge pump for dewatering and then is transported outside.
TABLE 1 Water quality test results for desalted Water for downhole Equipment
TABLE 2 Water quality test results for water used in underground fire sprinkler
TABLE 3 quality of effluent from above-ground reuse water pool
And (4) conclusion:
according to the mine water advanced treatment system disclosed by the invention, the desalted water after the mine water is treated and the filtered purified water can completely meet the requirements of various underground water through the water treatment process unit designed underground, the underground water is not required to be supplied through the underground water treatment process unit, the water quantity of the mine water pumped to the ground is effectively reduced, the investment and the operating cost of the above-ground water treatment are greatly reduced, and the energy consumption of water delivery is reduced; and the water treatment process unit designed on the ground ensures that the zero discharge of salt separation crystallization of the mine water is realized, and the produced high-quality reuse water can be used for nearby industry and agriculture or can reach the standard for discharge. The mine water advanced treatment method disclosed by the invention can completely meet the requirements of efficient and economic mine water environment-friendly treatment and recycling.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A mine water advanced treatment system is characterized by comprising a downhole advanced treatment system and an overground advanced treatment system which are communicated with each other;
the underground depth treatment system comprises an underground mining solid-liquid separation unit, an underground adjusting primary sedimentation unit, an underground tubular filtering unit and an underground reverse osmosis unit which are communicated in sequence, wherein the underground adjusting primary sedimentation unit and the underground tubular filtering unit are both communicated with an underground sludge dewatering unit, and the underground adjusting primary sedimentation unit is also communicated with the above-ground depth treatment system;
the overground advanced treatment system comprises an overground adjusting unit, an overground softening reaction precipitation unit, an overground filtering unit, an overground ultrafiltration unit, an overground first-stage reverse osmosis unit, an overground ion exchange unit, an overground second-stage reverse osmosis unit, an overground nanofiltration unit, an overground third-stage reverse osmosis unit, an overground salt evaporation crystallization unit and a mother liquor treatment unit which are sequentially communicated, wherein the above-ground adjusting unit is communicated with the underground adjusting primary sedimentation unit, the above-ground softening reaction sedimentation unit is also communicated with the above-ground sludge dewatering unit, the ground filtering unit, the ground first-stage reverse osmosis unit, the ground second-stage reverse osmosis unit and the ground third-stage reverse osmosis unit are respectively communicated with a ground reuse water pool, the above-ground nanofiltration unit is also communicated with an above-ground nitre evaporation crystallization unit, and the above-ground nitre evaporation crystallization unit is further communicated with the mother liquor treatment unit.
2. The mine water deep treatment system according to claim 1, wherein the solid-liquid separation equipment in the solid-liquid separation unit for the underground mine is selected from the group consisting of: one or more of a grid type solid-liquid separation device, a vibrating screen type solid-liquid separation device, a centrifugal type solid-liquid separation device and a sedimentation type solid-liquid separation device.
3. The mine water deep treatment system of claim 1, wherein the adjusting precipitation equipment in the downhole adjusting primary precipitation unit is selected from the group consisting of: one or more of a horizontal sedimentation tank, a clarification tank, a radial sedimentation tank, a mechanical stirring and regulating tank and an aeration stirring and regulating tank;
the conditioning precipitation equipment in the above-ground conditioning unit is selected from: one or more of a horizontal sedimentation tank, a clarification tank, a radial sedimentation tank, a mechanical stirring and regulating tank and an aeration stirring and regulating tank.
4. The mine water deep treatment system according to claim 1, wherein the downhole tubular filter unit adopts a coagulation reaction, and a filter device in the downhole tubular filter unit is selected from the group consisting of: a micro-filtration or ultra-filtration device,
the filtration membrane in the filtration device is selected from: inorganic ceramic membranes or organic material membranes.
5. The mine water deep treatment system of claim 1, wherein the settling pond in the above-ground softening reaction settling unit is selected from the group consisting of: a high-density sedimentation tank or a mechanical clarification tank.
6. The mine water advanced treatment system according to claim 1, characterized in that the filter in the above-ground filter unit is selected from the group consisting of: one or more of a V-shaped filter chamber, a multi-medium filter, an activated carbon filter, a valveless filter chamber, an external pressure type ultrafilter and an immersed ultrafilter;
the filter in the above ground ultrafiltration unit is selected from the group consisting of: one or more of a V-shaped filter chamber, a multi-medium filter, an activated carbon filter, a valveless filter chamber, an external pressure type ultrafilter and an immersion type ultrafilter.
7. The mine water deep treatment system according to claim 1, wherein reverse osmosis membranes in the downhole reverse osmosis unit, the above-ground primary reverse osmosis unit, the above-ground secondary reverse osmosis unit and the above-ground tertiary reverse osmosis unit are all selected from the group consisting of: one or more of a brackish water reverse osmosis membrane, a sea water reverse osmosis membrane and a high pressure reverse osmosis membrane;
the water inlet power of the underground tubular filtering unit, the underground reverse osmosis unit, the ground first-stage reverse osmosis unit, the ground second-stage reverse osmosis unit and the ground third-stage reverse osmosis unit is selected from the following steps: centrifugal pump power or water inlet power formed by elevation difference.
8. The mine water advanced treatment system according to claim 1, characterized in that the above-ground ion exchange unit adopts a weak acid cation bed and is filled with weak acid resin or chelating resin;
the nanofiltration membrane in the above-ground nanofiltration unit is selected from: a common nanofiltration membrane or a high pressure nanofiltration membrane.
9. The mine water deep treatment system according to claim 1, wherein the evaporators in the above-ground salt evaporative crystallization unit and the above-ground saltpeter evaporative crystallization unit are selected from the group consisting of: an evaporator in one or more stage combinations selected from the group consisting of: one or more of a multiple effect evaporator or an MVR evaporator;
the processing device in the mother liquor processing unit is selected from: one or more of a single-effect evaporator, a roller drying device, a spray drying device, a submerged combustion device and a mother liquor drying device.
10. A method for treating the mine water deep treatment system according to any one of claims 1 to 9, comprising the steps of:
step one, mine water flows into an underground adjusting primary sedimentation unit after particulate matters are removed by an underground mining solid-liquid separation unit, and produced slag is transported out; after the suspended matters are settled in the primary settling unit, supernatant is pumped into the underground tubular filtering unit, and the suspended matters in the mine water are removed through coagulation reaction precipitation and membrane filtration of the tubular membrane unit to meet the water inlet requirement of reverse osmosis; pumping a part of produced water filtered by the tubular filtering unit into an underground reverse osmosis unit, wherein the water produced by the underground reverse osmosis unit is used for desalted water of underground equipment; part of produced water of the underground tubular filtering unit and concentrated water of the underground reverse osmosis unit are used for underground spraying, ash removal, fire prevention and filling; sludge generated by the underground adjusting primary sedimentation unit and the underground tubular filtering unit is conveyed to an underground sludge dewatering unit for dewatering and then is transported out;
step two, the residual mine water of the underground adjusting primary sedimentation unit is pumped to an overground adjusting unit through a lifting pump; then the mixture is conveyed to an above-ground softening reaction precipitation unit by an above-ground adjusting unit, and the above-ground softening reaction precipitation unit is softened and de-hardened by adding medicine and then is conveyed to an above-ground filtering unit and an above-ground ultrafiltration unit to be filtered to remove suspended matters; the produced water of the above-ground ultrafiltration unit is pumped to the above-ground first-stage reverse osmosis unit, the produced water enters an above-ground reuse water pool after desalination through a reverse osmosis membrane, and concentrated water is pumped into the above-ground ion exchange unit; the overground ion exchange unit removes the residual hardness in the mine water through the adsorption of resin; the outlet water of the overground ion exchange unit is pumped to an overground secondary reverse osmosis unit, the produced water after desalination by a reverse osmosis membrane enters an overground reuse water pool, concentrated water is pumped into an overground nanofiltration unit, a nanofiltration device separates divalent ions, the nanofiltration produced water is further concentrated by an overground tertiary reverse osmosis unit, the produced water of the overground tertiary reverse osmosis unit enters the overground reuse water pool, and the concentrated water of the overground tertiary reverse osmosis unit is sent to an overground salt evaporation crystallization unit for concentration, evaporation and crystallization to produce a sodium chloride product; concentrated water of the ground nanofiltration unit is sent to a ground nitrate evaporative crystallization unit to be concentrated, evaporated and crystallized to generate a sodium sulfate product; finally, mother liquor generated by the above-ground salt evaporation crystallization unit and the above-ground saltpeter evaporation crystallization unit is sent to a mother liquor treatment unit to generate miscellaneous salt, so that zero emission of mine water is realized;
step three, the effluent of the overground reuse water pool is used for nearby agriculture and industry or is discharged after reaching the standard;
and step four, conveying the sludge generated by the ground softening reaction precipitation unit to a ground sludge dehydration unit for dehydration and then transporting the sludge outside.
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| CN111792764A (en) * | 2020-09-08 | 2020-10-20 | 山东格润内泽姆环保科技有限公司 | Underground coal mine full-membrane modular mine wastewater treatment method and device |
| CN112520912A (en) * | 2020-11-05 | 2021-03-19 | 南京大学 | High-salt high-hardness mine water near-zero discharge process |
| WO2022100313A1 (en) * | 2020-11-12 | 2022-05-19 | 南京万德斯环保科技股份有限公司 | Mine water advanced treatment system and mine water treatment method thereof |
| CN114906989A (en) * | 2022-05-24 | 2022-08-16 | 天津高能时代水处理科技有限公司 | Coal chemical industry waste water salt-separation zero-emission process system and treatment method |
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| CN111792764A (en) * | 2020-09-08 | 2020-10-20 | 山东格润内泽姆环保科技有限公司 | Underground coal mine full-membrane modular mine wastewater treatment method and device |
| CN112520912A (en) * | 2020-11-05 | 2021-03-19 | 南京大学 | High-salt high-hardness mine water near-zero discharge process |
| WO2022100313A1 (en) * | 2020-11-12 | 2022-05-19 | 南京万德斯环保科技股份有限公司 | Mine water advanced treatment system and mine water treatment method thereof |
| CN114906989A (en) * | 2022-05-24 | 2022-08-16 | 天津高能时代水处理科技有限公司 | Coal chemical industry waste water salt-separation zero-emission process system and treatment method |
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