CN114477589A - Mine water treatment system and method - Google Patents

Mine water treatment system and method Download PDF

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Publication number
CN114477589A
CN114477589A CN202210094811.7A CN202210094811A CN114477589A CN 114477589 A CN114477589 A CN 114477589A CN 202210094811 A CN202210094811 A CN 202210094811A CN 114477589 A CN114477589 A CN 114477589A
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tank
water
concentration
outlet
concentrated
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宋建超
李文毅
肖学权
常亮
杨彬
李强
刘浪
刘洋城
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Jereh Environment Engineering Technology Co ltd
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Jereh Environment Engineering Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/048—Purification of waste water by 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
    • C02F1/442—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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • 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
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/05—Conductivity or salinity
    • C02F2209/055—Hardness

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

The application discloses a mine water treatment system and method, and relates to the field of coal mine water treatment. A mine water treatment system is characterized in that a first-stage concentration desalting device is connected with a precipitation device and a product water tank respectively, the precipitation device is connected with a second-stage concentration desalting device and a precipitation treatment device respectively, the second-stage concentration desalting device is connected with a nanofiltration device and a product water tank respectively, the nanofiltration device is connected with a microfiltration membrane device and a product water tank respectively, the microfiltration membrane device is connected with an ion exchange resin device and the precipitation treatment device respectively, the ion exchange resin device is connected with an oxidation reaction device, and the oxidation reaction device is connected with an evaporation device. A mine water treatment method is applied to the mine water treatment system. The method and the device can solve the problems of low efficiency, high cost, large occupied area, complex process and the like in the current mine water treatment process.

Description

Mine water treatment system and method
Technical Field
The application belongs to the technical field of coal mine water treatment, and particularly relates to a mine water treatment system and method.
Background
A large amount of waste water is discharged in the coal mining process, if the waste water is directly discharged without being treated, the environment is inevitably seriously polluted, a large amount of waste of water resources is caused, and the aim of circular economy cannot be fulfilled. In order to protect the environment and save water resources, the mine water can be deeply desalted to realize zero emission, so that the pollution to the environment can be reduced, the water resources can be recycled, and the exploitation of underground water resources is reduced.
At present, evaporation crystallization salt separation is mostly adopted to realize zero emission in deep desalination and zero emission of mine water, and crystalline salts of sodium chloride and sodium sulfate are respectively produced. However, due to the large scale of mine water treatment, the large dosage of pretreatment at the front end, the low efficiency of concentration and reduction, the large amount of brine after evaporation crystallization treatment, the high overall operation cost and the complex process, and the problems of large floor area, complex process, high construction and operation cost and the like of the current mine water treatment system.
Disclosure of Invention
The embodiment of the application aims to provide a mine water treatment system and method, which can solve the problems of low efficiency, high cost, large occupied area, complex process and the like in the current mine water treatment process.
In order to solve the technical problem, the present application is implemented as follows:
the embodiment of the application provides a mine water treatment system, and the mine water treatment system comprises: a first-stage concentration desalting device, a precipitation device, a second-stage concentration desalting device, a nanofiltration device, a microfiltration membrane device, an ion exchange resin device, an oxidation reaction device, an evaporation device, a precipitation treatment device and a product water tank;
the first-stage concentration desalting device is connected with the precipitation device and the product water tank respectively, the precipitation device is connected with the second-stage concentration desalting device and the precipitation treatment device respectively, the second-stage concentration desalting device is connected with the nanofiltration device and the product water tank respectively, the nanofiltration device is connected with the microfiltration membrane device and the product water tank respectively, the microfiltration membrane device is connected with the ion exchange resin device and the precipitation treatment device respectively, the ion exchange resin device is connected with the oxidation reaction device, and the oxidation reaction device is connected with the evaporation device.
The embodiment of the application also provides a mine water treatment method, which comprises the following steps:
pretreating raw mine water;
performing primary concentration desalination on the pretreated mine water;
carrying out hardness removal, desilication and precipitation on concentrated water generated by the primary concentration and desalination, treating precipitates, and storing or using fresh water generated by the primary concentration and desalination;
carrying out secondary concentration desalination on concentrated water generated by the hard removal desilication precipitation;
nanofiltration is carried out on at least part of concentrated water generated by the secondary concentration desalination, and fresh water generated by the secondary concentration desalination is stored or used;
carrying out micro-flocculation precipitation on concentrated water generated by nanofiltration, and storing or using fresh water generated by nanofiltration;
carrying out ion exchange on concentrated water generated by the micro-flocculation precipitation;
oxidizing concentrated water generated by ion exchange;
and evaporating and crystallizing the oxidized concentrated water.
In the embodiment of the application, the first-stage concentration desalting device is used for carrying out primary concentration desalting, so that pollutants in mine water can be reduced rapidly, the treatment scale of a subsequent treatment unit can be reduced, and the construction and operation cost can be reduced; the precipitation device can be used for removing hardness, desiliconizing and precipitating, so that the dosage and the operating cost are reduced, and meanwhile, the occupied area is reduced; the secondary concentration desalination is carried out through the secondary concentration desalination device, so that pollutants in the mine water can be further reduced; the nanofiltration membrane salt separation, silicon removal, hardness removal and oxidation treatment processes are realized through a nanofiltration device, a microfiltration membrane device, an ion exchange resin device and an oxidation reaction device, and the treated water body is introduced into an evaporation device for evaporation and crystallization, so that zero emission can be realized; meanwhile, the sediment can be treated by the sediment treatment device, and the product water can be collected and stored by the product water tank, so that the product water can be reasonably utilized.
Based on the arrangement, the embodiment of the application adopts reasonable process design aiming at the characteristics of the mine water with high mineralization degree, reduces the construction investment and the operation cost, has stable treatment effect of the mine water, and realizes zero emission and resource utilization of the mine water.
Drawings
FIG. 1 is a schematic view of a mine water treatment system disclosed in an embodiment of the present application;
fig. 2 is a flowchart of a mine water treatment method disclosed in an embodiment of the present application.
Description of reference numerals:
1-primary sedimentation regulating tank; 2-a filter chamber; 3-a first ultrafiltration unit; 4-a first reverse osmosis component; 5-a first concentrated brine pond; 6-magnetic coagulating sedimentation device; 61-a first multi-grid stirring reaction tank; 62-a concentration sedimentation tank; 7-an intermediate pool; 8-a first multimedia filter; 9-a second ultrafiltration unit; 10-a second reverse osmosis component; 11-a second concentrated brine pond; 12-a second multimedia filter; 13-a high pressure nanofiltration device; 14-tubular microfiltration membrane devices; 141-a second multi-grid stirring reaction tank; 142-a flocculation concentration tank; 143-tubular microfiltration membrane elements; 15-ion exchange resin unit; 16-advanced oxidation reaction tank; 17-MVR falling film evaporation apparatus; 18-product water pool; 19-sludge concentration tank; 20-a mechanical dewatering element; 21-a first return channel; 22-second return channel.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. 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 application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
The embodiments of the present application are described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.
Referring to fig. 1, the embodiment of the application discloses a mine water treatment system, and the disclosed mine water treatment system comprises a primary concentration desalting device, a precipitation device, a secondary concentration desalting device, a nanofiltration device, a microfiltration membrane device, an ion exchange resin device 15, an oxidation reaction device, an evaporation device, a precipitation treatment device and a product water tank 18.
Wherein, the first-stage concentration desalination device is respectively connected with the precipitation device and the product water tank 18, so that the fresh water generated by the first-stage concentration desalination can be introduced into the product water tank 18 for storage, thereby facilitating the subsequent use; concentrated water generated by the first-stage concentration and desalination can be introduced into a precipitation device to be subjected to precipitation treatment by the precipitation device.
The precipitation device is respectively connected with the second-stage concentration desalting device and the precipitation treatment device, so that concentrated water passing through the precipitation device can be introduced into the second-stage concentration desalting device to carry out second-stage concentration desalting, and precipitates generated by the precipitation device enter the precipitation treatment device to be treated by the precipitation treatment device.
The secondary concentration desalting device is respectively connected with the nanofiltration device, the precipitation device and the product water tank 18, so that fresh water generated by secondary concentration desalting can be introduced into the product water tank 18 for storage, and is convenient for subsequent use; part of the concentrated water generated by the secondary concentration and desalination can be introduced into a precipitation device to be subjected to precipitation treatment through the precipitation device, and the other part of the concentrated water generated by the secondary concentration and desalination can be introduced into a nanofiltration device to realize the separation of low-valence ions and high-valence ions through the nanofiltration device.
The nanofiltration device is respectively connected with the microfiltration membrane device and the product water tank 18, so that fresh water generated by the nanofiltration device can be introduced into the product water tank 18 for storage, and is convenient for subsequent use; and (4) enabling concentrated water generated by the nanofiltration device to enter a microfiltration membrane device so as to be subjected to micro-flocculation precipitation concentration through the microfiltration membrane device. Optionally, the concentrated water produced by the nanofiltration device can also enter other concentrated brine containers for temporary storage.
The microfiltration membrane device is respectively connected with the ion exchange resin device 15 and the precipitation treatment device, so that the micro-flocculation precipitation generated by the microfiltration membrane device can be discharged to the precipitation treatment device for treatment; the concentrated water generated by the micro-filtration membrane device enters an ion exchange resin device 15 so as to remove calcium ions, magnesium ions and the like in the water body through the ion exchange resin.
The ion exchange resin device 15 is connected with the oxidation reaction device, so that the concentrated water treated by the ion exchange resin device 15 is introduced into the oxidation reaction tank to further degrade organic pollutants in the water body under the oxidation action.
The oxidation reaction device is connected with the evaporation device, so that the concentrated water oxidized by the oxidation reaction device can enter the evaporation device for evaporation and crystallization, and a high-purity crystalline salt product, such as a sodium sulfate product, can be produced. Optionally, the crystallized mother liquor can also flow back to the upstream of the primary concentration desalting device, such as the primary sedimentation regulating tank 1 and the like, so as to carry out concentration desalting treatment again.
In the embodiment of the application, the first-stage concentration desalting device is used for carrying out primary concentration desalting, so that pollutants in mine water can be reduced rapidly, the treatment scale of a subsequent treatment unit can be reduced, and the construction and operation cost can be reduced; the precipitation device can be used for removing hardness, desiliconizing and precipitating, so that the dosage and the operating cost are reduced, and meanwhile, the occupied area is reduced; the secondary concentration desalination is carried out through the secondary concentration desalination device, so that pollutants in the mine water can be further reduced; the nanofiltration membrane salt separation, silicon removal, hardness removal and oxidation treatment processes are realized through a nanofiltration device, a microfiltration membrane device, an ion exchange resin device 15 and an oxidation reaction device, and the treated water body is introduced into an evaporation device for evaporation and crystallization, so that zero emission can be realized; meanwhile, the sediment can be treated by the sediment treatment device, and the product water can be collected and stored by the product water tank 18, so that the product water can be reasonably utilized.
Based on the arrangement, the embodiment of the application adopts reasonable process design aiming at the characteristics of the mine water with high mineralization degree, reduces the construction investment and the operation cost, has stable treatment effect of the mine water, and realizes zero emission and resource utilization of the mine water.
In the embodiment of the application, the mine water treatment system can further comprise a first pretreatment device, and the mine water raw water can be pretreated by the first pretreatment device before being introduced into the primary concentration desalination device.
In some embodiments, the first pretreatment device comprises a primary sedimentation regulating tank 1 and a filter tank 2, wherein the outlet of the primary sedimentation regulating tank 1 is connected with the filter tank 2, and the outlet of the filter tank 2 is connected with a primary concentration desalting device.
In the actual process, the mine water raw water firstly enters the primary sedimentation regulating tank 1, and homogeneous uniform regulation and primary sedimentation are carried out in the primary sedimentation regulating tank 1, so that the primary regulation and sedimentation of the mine water raw water are realized. And then the effluent of the primary sedimentation regulating tank 1 enters a filter tank 2 and is filtered in the filter tank 2 to remove suspended matters in the mine water, so that the mine water is ensured not to have suspended matters with larger volume. And then the effluent of the filter 2 enters a first-stage concentration desalting device to carry out a first-stage concentration desalting process.
Based on the arrangement, the mine water can be pretreated through the primary sedimentation regulating tank 1 and the filter tank 2 of the first pretreatment device, so that the mine water can better meet the requirements of subsequent process treatment.
Optionally, the filter 2 may be a gravity-type valveless filter, and when the gravity-type valveless filter works, the filtration and the backwashing are automatically completed by utilizing the pressure difference of the inlet water level and the outlet water level, so that unpowered automatic circulating backwashing is realized. The filter is mainly used for intercepting, filtering and adsorbing silt, colloid and organic matters, and has the advantages of simple structure, convenient operation and lower operating cost.
In addition, the filter material in the filter 2 can adopt natural manganese sand containing manganese dioxide, and during filtering, an active filter membrane is formed on the surface layer of the filter material, so that the filter material has good catalytic oxidation and adsorption removal capacity on ferrous ions and manganese ions in mine water. While removing suspended matters and colloid, the composite material has certain iron and manganese removing capacity, and protects a subsequent ultrafiltration structure and a reverse osmosis structure. Optionally, the particle size of the filter material can be 0.5-1 mm, and the thickness of the filter material layer can be 800-1000 mm.
In some embodiments, the first concentrating desalination apparatus comprises a first ultrafiltration component 3 and a first reverse osmosis component 4, the first ultrafiltration component 3 has a first fresh water outlet and a first concentrated water outlet, wherein the first fresh water outlet is connected to the first reverse osmosis component 4, the first concentrated water outlet is connected to the primary sedimentation regulating tank 1, the first reverse osmosis component 4 has a second fresh water outlet and a second concentrated water outlet, the second fresh water outlet is connected to the product water tank 18, and the second concentrated water outlet is connected to the sedimentation device.
The first ultrafiltration unit 3 is used for removing particles, colloids, organic matters, bacteria and the like in the mine water. The mine water is treated by the first ultrafiltration part 3 to generate fresh water and concentrated water, wherein the fresh water enters the first reverse osmosis part 4 through the first fresh water outlet and is treated by the first reverse osmosis part 4; concentrated water enters the primary sedimentation regulating tank 1 through a first concentrated water outlet so as to be convenient for carrying out pretreatment and primary concentration desalination processes again.
The first reverse osmosis unit 4 is used for removing dissolved salts, colloids, microorganisms, organic matters and the like in the mine water. After the mine water is treated by the first reverse osmosis component 4, fresh water and concentrated water can be generated, wherein the fresh water enters the product water tank 18 through the second fresh water outlet to be stored so as to be reused for industrial water, agricultural irrigation and ecological water, and the concentrated water enters the precipitation device through the second concentrated water outlet to be subjected to precipitation treatment.
Optionally, a temporary storage pool, such as a first concentrated brine pool 5, may be provided between the first reverse osmosis unit 4 and the precipitation device to temporarily store the concentrated water produced by the first reverse osmosis unit 4 for further concentration and desalination.
Based on the arrangement, substances such as particles, colloid, organic matters, bacteria, dissolved salts, microorganisms and the like in the mine water can be removed preliminarily, so that primary concentration desalination of the mine water can be realized, and pollution impurities in the mine water can be reduced rapidly, so that subsequent treatment is facilitated.
In some embodiments, the sedimentation device comprises a first multi-cell stirring reaction tank 61 and a concentration sedimentation tank 62, wherein an inlet of the first multi-cell stirring reaction tank 61 is connected with the primary concentration desalting device, an outlet of the first multi-cell stirring reaction tank 61 is connected with the concentration sedimentation tank 62, and an outlet of the concentration sedimentation tank 62 is connected with the sedimentation treatment device.
Alternatively, the precipitation device may be a magnetic coagulation precipitation device 6, which is mainly composed of a first multi-compartment stirring reaction tank 61 and a concentration precipitation tank 62. In addition, the inlet of the first multi-compartment agitation reaction tank 61 may be connected to the first reverse osmosis unit 4.
It should be noted here that the magnetic coagulation sedimentation device 6 is developed on the basis of a high-density sedimentation tank, and the magnetic powder is added into the reaction tank, so that the quality of flocs is improved, the sedimentation speed of the flocs is accelerated, the surface load of a sedimentation area is improved, the occupied area is reduced, and meanwhile, the adding amount of the medicament can be reduced and the operating cost is reduced through the recovery of the magnetic powder and the sludge backflow.
Of course, the mine water treatment system may further include a first concentrated brine tank 5, the first concentrated brine tank 5 being disposed between the primary concentrating and desalting device and the precipitation device, that is, an inlet of the first concentrated brine tank 5 is connected to the first reverse osmosis unit 4 of the primary concentrating and desalting device, and an outlet of the first concentrated brine tank 5 is connected to the first multi-compartment agitation reaction tank 61 of the precipitation device. On this basis, the concentrated water generated by the first-stage concentrated desalination device can be temporarily stored by the first concentrated brine tank 5 for further treatment.
Aiming at the characteristics of high sulfate and high alkalinity of the mine water, the pH value, the dosing sequence and the type of the mine water can be controlled in the first multi-grid stirring reaction tank 61, and the aim of synchronously removing hardness, desiliconizing and precipitating is fulfilled by the concentration and precipitation tank 62. The sediment (such as the sediment sludge) generated by the sediment device enters the sediment treatment device for concentration, dehydration and other treatments so as to realize the treatment of the sediment.
Specifically, calcium hydroxide/sodium hydroxide, calcium chloride, a magnesium agent (such as magnesium oxide/magnesium chloride), polymeric ferric sulfate and polyacrylamide are sequentially added into the first multi-grid stirring reaction tank 61, and the pH value, the type of the added agent and the sequence of the added agent are controlled. According to the characteristics of high sulfate and high alkalinity in high-salinity mine water, the aims of synchronously removing hardness and desiliconizing are achieved through a series of reactions. The reaction formula is as follows:
Ca(HCO3)2+Ca(OH)2→2CaCO3↓+H2O
Mg(HCO3)2+2Ca(OH)2→2CaCO3↓+Mg(OH)2↓+H2O
2NaHCO3+Ca(OH)2→CaCO3↓+Na2CO3+2H2O
Na2CO3+CaCl2→CaCO3↓+2NaCl
MgO+H2O→Mg(OH)2↓
2Mg(OH)2+3SiO2→Mg2Si3O8·2H2O↓
before secondary concentration and desalination, the mine water can be pretreated again. Based on this, the mine water treatment system in the embodiment of the application further comprises a second pretreatment device, and the second pretreatment device comprises an intermediate water tank 7 and a first multi-media filter 8, wherein an inlet of the intermediate water tank 7 is connected with the sedimentation device, an outlet of the intermediate water tank 7 is connected with the first multi-media filter 8, and an outlet of the first multi-media filter 8 is connected with the second-stage concentration desalination device.
Wherein, the concentrated water produced by the precipitation device enters the intermediate water tank 7, acid is added into the intermediate water tank 7 to adjust the pH value to be neutral, then the effluent water of the intermediate water tank 7 enters the first multi-media filter 8 for filtration, and the mine water treated by the first multi-media filter 8 enters the secondary concentration desalination device for secondary concentration desalination.
Based on the arrangement, before the mine water is subjected to secondary concentration desalination, the pH value of the mine water can be adjusted in the intermediate water tank 7 of the second pretreatment device, and the mine water is filtered by the first multi-media filter 8, so that the mine water meets the requirements of secondary concentration desalination.
In some embodiments, the two-stage concentration desalination apparatus comprises a second ultrafiltration part 9 and a second reverse osmosis part 10, wherein the second ultrafiltration part 9 has a third fresh water outlet and a third concentrated water outlet, the third fresh water outlet is connected with the second reverse osmosis part 10, and the third concentrated water outlet is connected with the primary sedimentation regulating tank 1; the second reverse osmosis component 10 has a fourth fresh water outlet connected to the product water tank 18, a fourth concentrated water outlet connected to the precipitation device, and a fifth concentrated water outlet connected to the nanofiltration device.
The second ultrafiltration unit 9 is used to remove particles, colloids, organic matter and bacteria from the mine water. The mine water is treated by the second ultrafiltration part 9 to generate fresh water and concentrated water, wherein the fresh water enters the second reverse osmosis part 10 through the third fresh water outlet and is treated by the second reverse osmosis part 10, and the concentrated water enters the primary sedimentation regulating tank 1 through the third concentrated water outlet so as to be subjected to pretreatment and primary concentration desalination processes again.
The second reverse osmosis unit 10 is used to remove dissolved salts, colloids, microorganisms, organic matter, etc. from the mine water. The mine water is treated by the second reverse osmosis component 10 to generate fresh water and concentrated water, wherein the fresh water enters the product water pool 18 through the fourth fresh water outlet to be stored so as to be conveniently recycled for industrial water, agricultural irrigation and ecological water; and one part of the concentrated water enters the precipitation device through the fourth concentrated water outlet to carry out precipitation treatment, and the other part of the concentrated water enters the nanofiltration device through the fifth concentrated water outlet, so that the nanofiltration treatment is carried out on the mine water through the nanofiltration device.
Optionally, a temporary storage water tank, such as a second concentrated brine tank 11, may be further disposed between the second reverse osmosis unit 10 and the nanofiltration device, so as to temporarily store a part of the concentrated water generated by the second reverse osmosis unit 10 for further nanofiltration, salt separation and evaporative crystallization treatment.
Based on the arrangement, substances such as particles, colloid, organic matters, bacteria, dissolved salts, microorganisms and the like in the mine can be further removed, so that secondary concentration and desalination of the mine water can be realized, and pollution impurities in the mine water are further reduced, so that the subsequent treatment is facilitated.
Before nanofiltration treatment, the mine water can be pretreated again. Based on this, the mine water treatment system in the embodiment of the present application may further include a third pretreatment device, the third pretreatment device includes a second multimedia filter 12, an inlet of the second multimedia filter 12 is connected to the second-stage concentration desalination device, and an outlet of the second multimedia filter 12 is connected to the nanofiltration device.
Specifically, a fifth concentrated water outlet of the second reverse osmosis component 10 is connected with the second multi-media filter 12, so that the treated mine water enters the second multi-media filter 12 for filtration, and the filtered mine water enters the nanofiltration device for nanofiltration treatment.
Optionally, the mine water treatment system may further include a second concentrated brine tank 11, and the second concentrated brine tank 11 is disposed between the secondary concentrated desalination device and the nanofiltration device. Specifically, the fifth concentrated water outlet of the second reverse osmosis unit 10 is connected to the second concentrated brine tank 11, and the outlet of the second concentrated brine tank 11 is connected to the second multimedia filter 12. Therefore, the mine water subjected to secondary concentration and desalination can be temporarily stored in the second concentrated brine tank 11, filtered by the second multi-medium filter 12 and then introduced into the nanofiltration device, so that low-valence ions and high-valence ions can be separated by the nanofiltration device.
In some embodiments, the nanofiltration device has a fifth fresh water outlet connected to the product water tank 18 and a sixth concentrated water outlet connected to the microfiltration membrane device. Based on this, the fresh water generated by the nanofiltration device can be introduced into the product water tank 18 for storage so as to be reused for industrial water, agricultural irrigation and ecological water, and the concentrated water generated by the nanofiltration device enters the microfiltration membrane device for micro-flocculation precipitation.
Optionally, the nanofiltration device can adopt a high-pressure disc tube type nanofiltration membrane, the nanofiltration device is suitable for concentrated high-salinity sulfate mine water, sodium chloride is efficiently filtered under the condition that the operating pressure is 30-120 bar, the filtered fresh water enters the product water tank 18, sodium sulfate can be efficiently intercepted and concentrated, the interception rate reaches more than 98%, and the concentration of the sodium sulfate is concentrated to be more than 12%, so that the sodium sulfate is effectively recovered, and the resource utilization is realized to the maximum extent.
In this application embodiment, the mine water treatment system may further include a third concentrated brine tank disposed between the nanofiltration device and the microfiltration membrane device, that is, an inlet of the third concentrated brine tank is connected to the nanofiltration device, and an outlet of the third concentrated brine tank is connected to the microfiltration membrane device. Based on this, the third strong brine pond can be used for temporarily storing the concentrated water generated by the nanofiltration device, and then the mine water in the third strong brine pond can enter the microfiltration membrane device for treatment.
Of course, the third concentrated brine tank is not arranged, and the concentrated water outlet of the nanofiltration device is directly connected with the inlet of the microfiltration membrane device, and the mode can also meet the actual requirement.
In some embodiments, the microfiltration membrane device comprises a second multi-cell agitation reaction tank 141, a flocculation concentration tank 142 and a tubular microfiltration membrane part 143, wherein an inlet of the second multi-cell agitation reaction tank 141 is connected to the nanofiltration device, the flocculation concentration tank 142 is connected to the second multi-cell agitation reaction tank 141, the tubular microfiltration membrane part 143 is connected to the flocculation concentration tank 142, and an outlet of the tubular microfiltration membrane part 143 is connected to the ion exchange resin device 15; a first return channel 21 for returning flocculation and sedimentation is connected between the tubular microfiltration membrane part 143 and the flocculation concentration tank 142; the outlet of the flocculation concentration tank 142 is connected with a sedimentation treatment device.
In the embodiment of the present application, the microfiltration membrane device is composed of a second multi-grid stirring reaction tank 141, a flocculation concentration tank 142 and a tubular microfiltration membrane part 143, wherein, under a certain PH condition, a silicon removing agent and a coagulant aid are added into the second multi-grid stirring reaction tank 141 to form a micro flocculation precipitate, and then the micro flocculation precipitate is filtered through the tubular microfiltration membrane part 143, so as to realize solid-liquid separation, and the micro flocculation precipitate intercepted by the tubular microfiltration membrane part 143 can flow back to the flocculation concentration tank 142 through the first backflow channel 21. In order to prevent the micro-flocculation in the flocculation concentration tank 142 from accumulating too much, the micro-flocculation may be periodically discharged to a sedimentation treatment device to treat the micro-flocculation.
Optionally, the second multi-grid stirring reaction tank 141 may be a double-grid stirring reaction tank, sodium metaaluminate, polyferric sulfate, and polyacrylamide are respectively added into the double-grid stirring reaction tank, and form micro flocs or precipitates with silica in the water body, and solid-liquid separation is realized through the tubular microfiltration membrane part 143, so as to achieve the purpose of removing silicon and prevent the subsequent evaporative crystallization reactor from scaling. The tubular microfiltration membrane part 143 is suitable for use in high-salt water, and simultaneously utilizes micro-flocculation and cross-flow filtration to reduce the dosage and effectively avoid scaling, fouling and plugging.
Optionally, the aperture of the microfiltration membrane of the tubular microfiltration membrane part 143 is 0.2 μm, the material of the membrane tube is PP polypropylene, and the water flux is 200-400L/(m)2H) the maximum solids content of the feed water can reach 160 g/L.
Based on the arrangement, the micro-flocculation precipitation treatment of partial impurities in the mine water can be realized through the micro-filtration membrane device, so that the pollution impurities contained in the mine water can be further reduced.
Optionally, the ion exchange resin device 15 may adopt weak acid cation exchange resin, which uses hydrogen ions to exchange cations in the water body, and may treat wastewater with higher alkalinity, remove calcium ions and magnesium ions corresponding to alkalinity, and have large exchange capacity and easy regeneration.
In addition, the oxidation reaction device can adopt an ozone oxidation mode, ozone is a substance with stronger oxidation capacity in an oxidant, the oxidation-reduction potential in water reaches 2.07V, and the ozone is decomposed to generate hydroxyl free radicals, so that chain reaction is initiated, organic matters, bacteria and microorganisms in water can be instantly decomposed, and the reaction speed is high and the selectivity is low. By the oxidation of ozone, the COD concentration is controlled to be 200mg/L, the chroma and purity of the salt of the subsequent evaporation crystallization product can be ensured, and the scaling can be prevented.
In some embodiments, the evaporation device has a crystallization outlet for producing a crystallization product and a reflux port for refluxing the crystallization mother liquor, and the reflux port is connected with the primary settling tank 1 through a second reflux channel 22. Based on this, evaporation crystallization treatment can be carried out on mine water through an evaporation device to obtain a crystallized product, for example, a high-purity sodium sulfate product is produced through freezing crystallization, and a crystallized mother liquor flows back to the primary sedimentation regulating tank 1 through the second backflow channel 22 to be concentrated, desalted and crystallized again.
In order to treat the sediments, the sedimentation treatment device in the embodiment of the application comprises a sludge concentration tank 19 and a mechanical dehydration part 20, wherein the inlet of the sludge concentration tank 19 is connected with the sedimentation device and the micro-filtration membrane device respectively, and the outlet of the sludge concentration tank 19 is connected with the mechanical dehydration part 20. Based on this, can hold the precipitate through sludge thickening tank 19 to carry out dehydration mummification to the precipitate through mechanical dewatering device and handle, so that the moisture content satisfies the predetermined requirement, finally carry out the outsourcing and deal with.
Based on the mine water treatment system, the embodiment of the application also discloses a mine water treatment method, the steps of the disclosed mine water treatment method are shown in fig. 2, and the method comprises the following steps:
pretreating raw mine water;
performing primary concentration desalination on the pretreated mine water;
carrying out hardness removal, desilication and precipitation on concentrated water generated by the primary concentration and desalination, treating precipitates, and storing or using fresh water generated by the primary concentration and desalination;
carrying out secondary concentration desalination on strong brine generated by the hard desilication precipitation;
nanofiltration is carried out on at least part of concentrated water generated by the secondary concentration desalination, and fresh water generated by the secondary concentration desalination is stored or used;
carrying out micro-flocculation precipitation on concentrated water generated by nanofiltration, and storing or using fresh water generated by nanofiltration;
carrying out ion exchange on concentrated water generated by the micro-flocculation precipitation;
oxidizing concentrated water generated by ion exchange;
and evaporating and crystallizing the oxidized concentrated water.
It can be understood that the implementation of each step included in the mine water treatment method is implemented based on the corresponding device in the mine water treatment system, and specific reference may be made to the corresponding content in the mine water treatment system, which is not described herein again.
This is explained in more detail below in connection with fig. 1 in various embodiments.
Example 1:
the embodiment of the application discloses mine water treatment system, and the disclosed mine water treatment system comprises a primary sedimentation regulating tank 1, a filter tank 2, a first ultrafiltration part 3, a first reverse osmosis part 4, a first concentrated salt water tank 5, a magnetic coagulation precipitation device 6, a middle water tank 7, a first multi-medium filter 8, a second ultrafiltration part 9, a second reverse osmosis part 10, a second concentrated salt water tank 11, a second multi-medium filter 12, a high-pressure nanofiltration device 13, a tubular microfiltration membrane device 14, an ion exchange resin device 15, an advanced oxidation reaction tank 16, an MVR falling film evaporation device 17, a product water tank 18 and a sludge concentration tank 19.
Wherein, the outlet of the primary sedimentation regulating tank 1 is communicated with the inlet of the filter tank 2, the outlet of the filter tank 2 is communicated with the inlet of the first ultrafiltration component 3, the fresh water outlet (i.e. the first fresh water outlet) of the first ultrafiltration component 3 is communicated with the inlet of the first reverse osmosis component 4, the concentrated water outlet (i.e. the first concentrated water outlet) of the first ultrafiltration component 3 is communicated with the inlet of the primary sedimentation regulating tank 1, the fresh water outlet (i.e. the second fresh water outlet) of the first reverse osmosis component 4 is connected with the inlet of the product water tank 18, the concentrated water outlet (i.e. the second concentrated water outlet) of the first reverse osmosis component 4 is communicated with the inlet of the first concentrated brine tank 5, the outlet of the first concentrated brine tank 5 is communicated with the inlet of the magnetic coagulation sedimentation device 6, the outlet of the magnetic coagulation sedimentation device 6 is communicated with the inlet of the intermediate water tank 7, the outlet of the intermediate water tank 7 is communicated with the inlet of the first multimedia filter 8, an outlet of the first multimedia filter 8 is communicated with an inlet of the second ultrafiltration part 9, a fresh water outlet (i.e., a third fresh water outlet) of the second ultrafiltration part 9 is communicated with an inlet of the second reverse osmosis part 10, a concentrated water outlet (i.e., a third concentrated water outlet) of the second ultrafiltration part 9 is communicated with an inlet of the primary sedimentation adjustment tank 1, a fresh water outlet (i.e., a fourth fresh water outlet) of the second reverse osmosis part 10 is communicated with an inlet of the product water tank 18, a concentrated water outlet (i.e., a fifth concentrated water outlet) of the second reverse osmosis part 10 is communicated with an inlet of the second concentrated brine tank 11, an outlet of the second concentrated brine tank 11 is communicated with an inlet of the second multimedia filter 12, an outlet of the second multimedia filter 12 is communicated with an inlet of the high-pressure nanofiltration device 13, a fresh water outlet (i.e., a fifth fresh water outlet) of the high-pressure nanofiltration device 13 is communicated with an inlet of the product water tank 18, a concentrated water outlet (i.e., a sixth concentrated water outlet) is communicated with an inlet of the tubular microfiltration membrane device 14, an outlet of the tubular microfiltration membrane device 14 is communicated with an inlet of the ion exchange resin device 15, an outlet of the ion exchange resin device 15 is communicated with an inlet of the advanced oxidation reaction tank 16, and an outlet of the advanced oxidation reaction tank 16 is communicated with an inlet of the MVR falling film evaporation device 17.
The magnetic coagulation sedimentation device 6 comprises a first multi-grid stirring reaction tank 61 and a concentration sedimentation tank 62, the inlet and the outlet of which are sequentially communicated, the outlet at the bottom of the concentration sedimentation tank 62 is communicated with the inlet of the sludge concentration tank 19, and the outlet at the upper part of the concentration sedimentation tank 62 is communicated with the inlet of the middle water tank 7.
The tubular microfiltration membrane device 14 comprises a second multi-grid stirring reaction tank 141, a flocculation concentration tank 142 and a tubular microfiltration membrane part 143, wherein an outlet of the second multi-grid stirring reaction tank 141 is communicated with an inlet of the flocculation concentration tank 142, an outlet of the upper part of the flocculation concentration tank 142 is communicated with an inlet of the tubular microfiltration membrane part 143, an outlet of the bottom of the flocculation concentration tank 142 is communicated with an inlet of the sludge concentration tank 19, a concentrated water outlet of the tubular microfiltration membrane part 143 is communicated with an inlet of the flocculation concentration tank 142, and a fresh water outlet of the tubular microfiltration membrane is communicated with an inlet of the ion exchange resin device 15.
Example 2:
referring to embodiment 1, a mine water treatment system includes the following processes: a first-stage pretreatment and concentration section, a second-stage pretreatment and concentration section and a nanofiltration salt separation and evaporation crystallization section.
Wherein, the first-stage pretreatment and concentration section: mine water raw water firstly enters a primary sedimentation regulating tank 1, after homogeneous uniform volume and primary sedimentation, enters a filter tank 2 to remove suspended matters, the effluent of the filter tank 2 enters a subsequent first ultrafiltration part 3 and a first reverse osmosis part 4 to carry out primary concentration desalination, the fresh water produced by the first reverse osmosis part 4 enters a product water tank 18 for recycling, and the concentrated water produced by the first reverse osmosis part 4 enters a secondary pretreatment and concentration section.
Alternatively, the first ultrafiltration part 3 is an immersion type ultrafiltration membrane, and the first reverse osmosis part 4 is a picric water reverse osmosis membrane.
A second-stage pretreatment and concentration section: the strong brine generated by the primary pretreatment and concentration section enters the magnetic coagulation sedimentation device 6, and different water treatment agents are respectively added into a first multi-grid stirring reaction tank 61 of the magnetic coagulation sedimentation device 6, so that the purpose of hard desilication is achieved. The effluent of the magnetic coagulation sedimentation device 6 enters a first multi-media filter 8 after the PH value of the effluent is adjusted back through an intermediate water tank 7, and suspended matters are further removed; the effluent of the first multi-media filter 8 enters a subsequent second ultrafiltration part 9 and a second reverse osmosis part 10 for secondary concentration and desalination, the fresh water produced by the second reverse osmosis part 10 enters a product water pool 18 for reuse, and the concentrated water produced by the second reverse osmosis part 10 is continuously treated.
Alternatively, the second ultrafiltration part 9 employs a hollow fiber type ultrafiltration membrane, and the second reverse osmosis part 10 employs a seawater desalination reverse osmosis membrane.
Nano-filtering salt separation and evaporation crystallization section: concentrated water generated in the secondary pretreatment and concentration section enters a second multi-media filter 12, the effluent of the second multi-media filter 12 enters a high-pressure nanofiltration device 13 to realize the separation of low-valence ions and high-valence ions, fresh water generated by the high-pressure nanofiltration device 13 enters a product water tank 18 for recycling, concentrated water generated by the high-pressure nanofiltration device 13 enters a tubular microfiltration membrane device 14, different water treatment agents are added into a second multi-grid stirring reaction tank 141 of the tubular microfiltration membrane device 14 to form micro flocs, solid-liquid separation is realized through a tubular microfiltration membrane part 143, the separated concentrated water enters an ion exchange resin device 15, and the ion exchange resin device 15 adopts weak acid cation resin to remove calcium ions and magnesium ions in a water body through ion exchange; the effluent of the ion exchange resin device 15 enters an advanced oxidation reaction tank 16, and ozone is introduced to further degrade organic pollutants in the water body; the effluent of the advanced oxidation reaction tank 16 enters an MVR falling film evaporation device 17 for concentration and decrement, a high-purity sodium sulfate product is produced through freezing crystallization, and the crystallized mother liquor flows back to the primary sedimentation regulating tank 1.
Example 3:
a mine water treatment system comprises the following working procedures: a first-stage pretreatment and concentration section, a second-stage pretreatment and concentration section and a nanofiltration salt separation and evaporation crystallization section.
Wherein, the first-stage pretreatment and concentration section: the mine water raw water firstly enters a primary sedimentation regulating tank 1, and enters a filter tank 2 after homogeneous uniform volume and primary sedimentation, the filter tank 2 adopts a gravity type valveless filter tank, and a filter material adopts a natural manganese sand filter material, so that the purposes of synchronously removing iron and manganese, removing suspended matters and reducing the operation cost are achieved. The effluent of the filter 2 enters a subsequent first ultrafiltration part 3 and a first reverse osmosis part 4 for primary concentration and desalination, the fresh water produced by the first reverse osmosis part 4 enters a product water tank 18 for reuse, and the concentrated water produced by the first reverse osmosis part 4 enters a secondary pretreatment and concentration section.
Alternatively, the first ultrafiltration part 3 is an immersion type ultrafiltration membrane, and the first reverse osmosis part 4 is a picric water reverse osmosis membrane.
A second-stage pretreatment and concentration section: the strong brine generated by the primary pretreatment and concentration section enters the magnetic coagulation sedimentation device 6, and different water treatment agents are respectively added into a first multi-grid stirring reaction tank 61 of the magnetic coagulation sedimentation device 6, so that the purpose of hard desilication is achieved. The effluent of the magnetic coagulation sedimentation device 6 enters a first multi-media filter 8 after the PH value of the effluent is adjusted back through an intermediate water tank 7, and suspended matters are further removed; the effluent of the first multi-media filter 8 enters a second ultrafiltration part 9 and a second reverse osmosis part 10 for secondary concentration and desalination, the fresh water produced by the second reverse osmosis part 10 enters a product water pool 18 for reuse, and the strong brine produced by the second reverse osmosis part 10 is continuously treated.
Alternatively, the second ultrafiltration part 9 employs a hollow fiber type ultrafiltration membrane, and the second reverse osmosis part 10 employs a seawater desalination reverse osmosis membrane.
Nano-filtering salt separation and evaporation crystallization section: the strong brine generated in the second-stage pretreatment and concentration section enters a second multi-media filter 12, the effluent of the second multi-media filter 12 enters a high-pressure nanofiltration device 13 to realize the separation of low-valence ions and high-valence ions, the fresh water produced by the high-pressure nanofiltration device 13 enters a product water tank 18 for recycling, the strong brine produced by the high-pressure nanofiltration device 13 enters a tubular microfiltration membrane device 14, different water treatment agents are added into a second multi-grid stirring reaction tank 141 of the microfiltration membrane device to form micro flocs, the solid-liquid separation is realized through a tubular microfiltration membrane part 143, the separated strong brine enters an ion exchange resin device 15, and the ion exchange resin device 15 adopts weak acid cation resin to remove calcium ions and magnesium ions in the water body through ion exchange; the effluent of the ion exchange resin device 15 enters an advanced oxidation reaction tank 16, and ozone is introduced to further degrade organic pollutants in the water body; the effluent of the advanced oxidation reaction tank 16 enters an MVR falling film evaporation device 17 to be concentrated and reduced, a high-purity sodium sulfate product is produced through freezing and crystallization, and the crystallized mother liquor flows back to the primary sedimentation regulating tank 1.
Example 4:
a first-stage pretreatment and concentration section: the mine water raw water firstly enters a primary sedimentation regulating tank 1, and enters a filter tank 2 after homogeneous uniform volume and primary sedimentation, the filter tank 2 adopts a gravity type valveless filter tank, and the filter material adopts natural manganese sand filter material, so that the purposes of synchronously removing iron and manganese, removing suspended matters and reducing the operation cost are achieved. The effluent of the filter tank 2 enters a subsequent first ultrafiltration part 3 and a first reverse osmosis part 4 for primary concentration and desalination, the fresh water produced by the first reverse osmosis part 4 enters a product water tank 18 for recycling, and the strong brine produced by the first reverse osmosis part 4 enters a secondary pretreatment and concentration section.
Alternatively, the first ultrafiltration part 3 is an immersion type ultrafiltration membrane, and the first reverse osmosis part 4 is a picric water reverse osmosis membrane.
A second-stage pretreatment and concentration section: the strong brine generated in the first-stage pretreatment and concentration section enters the magnetic coagulation precipitation device 6, and calcium hydroxide, calcium chloride, magnesium oxide, polymeric ferric sulfate and polyacrylamide are sequentially added into a first multi-grid stirring reaction tank 61 of the magnetic coagulation precipitation device 6, so that the purpose of hard desilication is achieved. The effluent of the magnetic coagulation sedimentation device 6 enters a first multi-media filter 8 after the pH value of the effluent is adjusted back through an intermediate water tank 7, and suspended matters are further removed. The effluent of the first multi-media filter 8 enters a subsequent second ultrafiltration part 9 and a second reverse osmosis part 10 for secondary concentration and desalination, the fresh water produced by the second reverse osmosis part 10 enters a product water pool 18 for reuse, and the concentrated water produced by the second reverse osmosis part 10 is continuously treated.
Alternatively, the second ultrafiltration part 9 employs a hollow fiber type ultrafiltration membrane, and the second reverse osmosis part 10 employs a seawater desalination reverse osmosis membrane.
Nano-filtering salt separation and evaporation crystallization section: strong brine generated in the second-stage pretreatment and concentration section enters a second multi-media filter 12, and effluent of the second multi-media filter 12 enters a high-pressure nanofiltration device 13, so that low-valence ions and high-valence ions are separated; fresh water produced by the high-pressure nanofiltration device 13 enters a product water tank 18 for recycling, concentrated water produced by the high-pressure nanofiltration device 13 enters a tubular microfiltration membrane device 14, different water treatment agents are added into a second multi-grid stirring reaction tank 141 of the tubular microfiltration membrane device 14 to form micro flocs, solid-liquid separation is realized through a tubular microfiltration membrane part 143, the separated concentrated water enters an ion exchange resin device 15, the ion exchange resin device 15 adopts weak acid cation resin, calcium and magnesium ions in a water body are removed through ion exchange, water discharged from the ion exchange resin device 15 enters an advanced oxidation reaction tank 16, and ozone is introduced to further degrade organic pollutants in the water body; the effluent of the advanced oxidation reaction tank 16 enters an MVR falling film evaporation device 17 to be concentrated and reduced, a high-purity sodium sulfate product is produced through freezing and crystallization, and the crystallized mother liquor flows back to the primary sedimentation regulating tank 1.
Example 5:
a first-stage pretreatment and concentration section: the mine water raw water firstly enters a primary sedimentation regulating tank 1, and enters a filter tank 2 after homogeneous uniform amount and primary sedimentation, the filter tank 2 adopts a gravity type valveless filter tank, and a filter material adopts natural manganese sand filter material, so that the purposes of synchronously removing iron and manganese, removing suspended matters and reducing the operation cost are achieved. The effluent of the filter 2 enters a subsequent first ultrafiltration part 3 and a first reverse osmosis part 4 for primary concentration and desalination; fresh water produced by the first reverse osmosis component 4 enters the product water pool 18 for recycling, and strong brine produced by the first reverse osmosis component 4 enters the secondary pretreatment and concentration section.
Alternatively, the first ultrafiltration part 3 is an immersion type ultrafiltration membrane, and the first reverse osmosis part 4 is a picric water reverse osmosis membrane.
A second-stage pretreatment and concentration section: the strong brine generated in the first-stage pretreatment and concentration section enters the magnetic coagulation precipitation device 6, and calcium hydroxide, calcium chloride, magnesium oxide, polymeric ferric sulfate and polyacrylamide are sequentially added into a first multi-grid stirring reaction tank 61 of the magnetic coagulation precipitation device 6, so that the purpose of hard desilication is achieved. The effluent of the magnetic coagulation sedimentation device 6 enters a first multi-media filter 8 after the pH value of the effluent is adjusted back through an intermediate water tank 7, and suspended matters are further removed. The effluent of the first multi-media filter 8 enters a subsequent second ultrafiltration part 9 and a second reverse osmosis part 10 for secondary concentration and desalination, the fresh water produced by the second reverse osmosis part 10 enters a product water pool 18 for reuse, and the strong brine produced by the second reverse osmosis part 10 is continuously treated.
Alternatively, the second ultrafiltration part 9 employs a hollow fiber type ultrafiltration membrane, and the second reverse osmosis part 10 employs a seawater desalination reverse osmosis membrane.
Nano-filtering salt separation and evaporation crystallization section: strong brine generated in the second-stage pretreatment and concentration section enters a second multi-media filter 12, and effluent of the second multi-media filter 12 enters a high-pressure nanofiltration device 13, so that low-valence ions and high-valence ions are separated; fresh water produced by the high-pressure nanofiltration device 13 enters a product water tank 18 for recycling, concentrated water produced by the high-pressure nanofiltration device 13 enters a tubular microfiltration membrane device 14, sodium metaaluminate, polyferric sulfate, polyacrylamide and silicon dioxide are added into a second multi-grid stirring reaction tank 141 of the tubular microfiltration membrane device 14 to react to form micro flocs, solid-liquid separation is realized through a tubular microfiltration membrane part 143, the separated concentrated water enters an ion exchange resin device 15, the ion exchange resin device 15 adopts weak acid cation resin, calcium and magnesium ions in wastewater are removed through ion exchange, water discharged from the ion exchange resin device 15 enters an advanced oxidation reaction tank 16, and ozone is introduced to further degrade organic pollutants in a water body; the effluent of the advanced oxidation reaction tank 16 enters an MVR falling film evaporation device 17 for concentration and decrement, a high-purity sodium sulfate product is produced through freezing and crystallization, and the crystallized mother liquor flows back to the primary sedimentation regulating tank 1.
In order to verify the treatment method or system in the embodiment of the application, the inventor installs the treatment method or system in the mine water deep desalination zero emission treatment project according to the embodiment of the application, and the main water quality indexes of the project water inflow are as follows: COD less than or equal to 30mg/L, Ca2+≤70mg/L、Mg2+≤12mg/L、SiO2≤20mg/L、HCO3 -≤680mg/L、Cl-≤160mg/L、SO4 2-The mine water is typical high-salinity coal mine water, the hardness, the alkalinity and the sulfate concentration are high, according to the water quality characteristics, the technical scheme in the embodiment of the application is adopted for design, construction, installation and debugging, the project effluent reaches the local drainage basin discharge standard, and the total salt content is less than or equal to 1600mg/L, SO42 -The content of sodium sulfate is less than or equal to 650mg/L, the byproduct sodium sulfate reaches the II-class standard of GB/T6009-2014 industrial anhydrous sodium sulfate, the yield of miscellaneous salt is less than 10 percent, and the deep desalination, zero emission and resource recycling of mine water are realized.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (12)

1. A mine water treatment system, comprising: a first-stage concentration desalting device, a precipitation device, a second-stage concentration desalting device, a nanofiltration device, a microfiltration membrane device, an ion exchange resin device, an oxidation reaction device, an evaporation device, a precipitation treatment device and a product water tank;
the first-stage concentration desalting device is connected with the precipitation device and the product water tank respectively, the precipitation device is connected with the second-stage concentration desalting device and the precipitation treatment device respectively, the second-stage concentration desalting device is connected with the nanofiltration device and the product water tank respectively, the nanofiltration device is connected with the microfiltration membrane device and the product water tank respectively, the microfiltration membrane device is connected with the ion exchange resin device and the precipitation treatment device respectively, the ion exchange resin device is connected with the oxidation reaction device, and the oxidation reaction device is connected with the evaporation device.
2. The mine water treatment system according to claim 1, further comprising a first pretreatment device;
the first pretreatment device comprises a primary sedimentation regulating tank and a filter tank, wherein an outlet of the primary sedimentation regulating tank is connected with the filter tank, and an outlet of the filter tank is connected with the primary concentration desalting device.
3. The mine water treatment system of claim 2 wherein the primary concentration desalination device comprises a first ultrafiltration section and a first reverse osmosis section;
the first ultrafiltration component is provided with a first fresh water outlet and a first concentrated water outlet, the first fresh water outlet is connected with the first reverse osmosis component, and the first concentrated water outlet is connected with the primary sedimentation regulating tank;
the first reverse osmosis component is provided with a second fresh water outlet and a second concentrated water outlet, the second fresh water outlet is connected with the product water pool, and the second concentrated water outlet is connected with the precipitation device.
4. The mine water treatment system of claim 1, wherein the sedimentation device comprises a first multi-cell stirring reaction tank and a concentration sedimentation tank;
the inlet of the first multi-grid stirring reaction tank is connected with the first-level concentration desalting device, the outlet of the first multi-grid stirring reaction tank is connected with the concentration sedimentation tank, and the outlet of the concentration sedimentation tank is connected with the precipitation treatment device.
5. The mine water treatment system according to claim 1, further comprising a second pretreatment device;
the second pretreatment device comprises an intermediate water tank and a first multi-media filter, wherein an inlet of the intermediate water tank is connected with the sedimentation device, an outlet of the intermediate water tank is connected with the first multi-media filter, and an outlet of the first multi-media filter is connected with the second-stage concentration desalination device.
6. The mine water treatment system according to claim 5, further comprising a first pretreatment device comprising a primary sedimentation conditioning tank;
the second-stage concentration desalting device comprises a second ultrafiltration part and a second reverse osmosis part;
the second ultrafiltration component is provided with a third fresh water outlet and a third concentrated water outlet, the third fresh water outlet is connected with the second reverse osmosis component, and the third concentrated water outlet is connected with the primary sedimentation regulating tank;
the second reverse osmosis component is provided with a fourth fresh water outlet, a fourth concentrated water outlet and a fifth concentrated water outlet, the fourth fresh water outlet is connected with the product water tank, the fourth concentrated water outlet is connected with the precipitation device, and the fifth concentrated water outlet is connected with the nanofiltration device.
7. The mine water treatment system according to claim 1, further comprising a third pretreatment device, wherein the third pretreatment device comprises a second multi-media filter, an inlet of the second multi-media filter is connected with the secondary concentration desalination device, and an outlet of the second multi-media filter is connected with the nanofiltration device;
the nanofiltration device is provided with a fifth fresh water outlet and a sixth concentrated water outlet, the fifth fresh water outlet is connected with the product water pool, and the sixth concentrated water outlet is connected with the microfiltration membrane device.
8. The mine water treatment system according to any one of claims 1 to 7, further comprising a first concentrated brine pond, wherein an inlet of the first concentrated brine pond is connected with the primary concentrated desalting device, and an outlet of the first concentrated brine pond is connected with the precipitation device;
and/or the mine water treatment system further comprises a second concentrated brine tank, an inlet of the second concentrated brine tank is connected with the second-stage concentration desalting device, and an outlet of the second concentrated brine tank is connected with the nanofiltration device.
9. The mine water treatment system according to claim 1, wherein the microfiltration membrane device comprises a second multi-cell stirring reaction tank, a flocculation concentration tank and a tubular microfiltration membrane part;
the inlet of the second multi-grid stirring reaction tank is connected with the nanofiltration device, the flocculation concentration tank is connected with the second multi-grid stirring reaction tank, the tubular microfiltration membrane part is connected with the flocculation concentration tank, the outlet of the tubular microfiltration membrane part is connected with the ion exchange resin device, and a first return channel for return flocculation precipitation is also connected between the tubular microfiltration membrane part and the flocculation concentration tank;
the outlet of the flocculation concentration tank is connected with the sedimentation treatment device.
10. The mine water treatment system according to claim 1, further comprising a first pretreatment device comprising a primary sedimentation conditioning tank;
the evaporation plant is provided with a crystallization outlet for producing a crystallized product and a reflux port for refluxing crystallized mother liquor, and the reflux port is connected with the primary sedimentation regulating tank through a second reflux channel.
11. The mine water treatment system of claim 1 wherein the precipitation treatment device comprises a sludge thickener and a mechanical dewatering component;
the inlet of the sludge concentration tank is respectively connected with the sedimentation device and the microfiltration membrane device, and the outlet of the sludge concentration tank is connected with the mechanical dehydration component.
12. A mine water treatment method applied to the mine water treatment system of any one of claims 1 to 11, comprising the following steps of:
pretreating raw mine water;
performing primary concentration desalination on the pretreated mine water;
carrying out hardness removal, desilication and precipitation on concentrated water generated by the primary concentration and desalination, treating precipitates, and storing or using fresh water generated by the primary concentration and desalination;
carrying out secondary concentration desalination on concentrated water generated by the hard removal desilication precipitation;
nanofiltration is carried out on at least part of concentrated water generated by the secondary concentration desalination, and fresh water generated by the secondary concentration desalination is stored or used;
carrying out micro-flocculation precipitation on concentrated water generated by nanofiltration, and storing or using fresh water generated by nanofiltration;
carrying out ion exchange on concentrated water generated by the micro-flocculation precipitation;
oxidizing concentrated water generated by ion exchange;
and evaporating and crystallizing the oxidized concentrated water.
CN202210094811.7A 2022-01-26 2022-01-26 Mine water treatment system and method Pending CN114477589A (en)

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CN109231632A (en) * 2018-11-05 2019-01-18 华电水务工程有限公司 The processing method and system of a kind of highly mineralized mine water reuse and resource utilization
CN111285531A (en) * 2020-04-01 2020-06-16 煤科集团杭州环保研究院有限公司 Method and system for concentrating high-salinity mine water
CN112551787A (en) * 2020-11-12 2021-03-26 南京万德斯环保科技股份有限公司 Mine water deep treatment system and method for treating mine water

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109231632A (en) * 2018-11-05 2019-01-18 华电水务工程有限公司 The processing method and system of a kind of highly mineralized mine water reuse and resource utilization
CN111285531A (en) * 2020-04-01 2020-06-16 煤科集团杭州环保研究院有限公司 Method and system for concentrating high-salinity mine water
CN112551787A (en) * 2020-11-12 2021-03-26 南京万德斯环保科技股份有限公司 Mine water deep treatment system and method for treating mine water

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