CN112358103A - Nanofiltration device, and nanofiltration pre-mode mine water treatment system and process - Google Patents

Nanofiltration device, and nanofiltration pre-mode mine water treatment system and process Download PDF

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CN112358103A
CN112358103A CN202011038037.5A CN202011038037A CN112358103A CN 112358103 A CN112358103 A CN 112358103A CN 202011038037 A CN202011038037 A CN 202011038037A CN 112358103 A CN112358103 A CN 112358103A
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nanofiltration
stage
water
crystallization
mine water
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李买军
赵婷
赛世杰
党平
余占海
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Inner Mongolia Jiuke Kangrui Environmental Technology Co ltd
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Inner Mongolia Jiuke Kangrui Environmental 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
    • C02F1/001—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
    • C02F1/44—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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
    • C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
    • 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
    • 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
    • C02F2001/007—Processes including a sedimentation step
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/12—Halogens or halogen-containing compounds
    • C02F2101/14—Fluorine or fluorine-containing 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
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention

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

Abstract

The invention discloses a nanofiltration device, a nanofiltration pre-positioned mine water treatment system and a nanofiltration pre-positioned mine water treatment process. The system comprises a pretreatment device, a nanofiltration device, a concentration device and a sodium chloride crystallization device; the pretreatment device, the nanofiltration device, the concentration device and the sodium chloride crystallization device are sequentially connected. The process comprises the steps of pretreating mine water through a pretreatment device, removing suspended matters, scaling ions, fluorides and COD in the mine water, enabling the pretreated mine water to enter a nanofiltration device for multistage nanofiltration treatment to intercept divalent ions in the mine water, enabling nanofiltration produced water of the nanofiltration device to be directly recycled or discharged up to the standard, enabling nanofiltration concentrated water of the nanofiltration device to enter a concentration device for concentration treatment, and enabling the concentrated water of the concentration device to enter a sodium chloride crystallization device for crystallization treatment to produce sodium chloride. The system can realize more thorough separation of monovalent salt and divalent salt and has low operation difficulty.

Description

Nanofiltration device, and nanofiltration pre-mode mine water treatment system and process
Technical Field
The invention relates to the field of water treatment, in particular to a mine water treatment system in a nanofiltration pre-positioned mode and a process thereof.
Background
The development and utilization of mine water as a water resource in China have been about 40 years old, and the treatment process of mine water containing suspended matters, high-salinity mine water and acidic mine water is basically mature. The process flow of the treatment of the mine water containing suspended matters is generally as follows: suspended matter mine water → water quantity regulating tank → lift pump → sedimentation tank (or clarification tank) → filtration → disinfection → recycling. The pretreatment process of the high-salinity mine water is basically the same as that of the conventional mine water, and is different from the fact that a desalting process is added in the subsequent process, and the desalting process commonly used in China at the present stage is a reverse osmosis technology. In the prior art, the coal mine wastewater treatment usually adopts a pretreatment-membrane separation concentration treatment process, the treated fresh water is recycled, and the strong brine is directly discharged. Realizing zero discharge of waste water becomes the self requirement and external requirement of the development of the chemical industry.
At the present stage, the zero discharge technology is applied in the field of wastewater treatment such as coal chemical wastewater, mine water and the like, the main technical route is pretreatment → membrane concentration → membrane salt separation → deep treatment → salt separation crystallization by a cold-hot method, the technical requirement is high, and particularly in the salt separation crystallization stage by the cold-hot method, because the front-end membrane separation is not thorough, the crystallization difficulty of the divalent salt side is high, and improper control can cause accidents such as reduction of the purity of the crystallized salt, system blockage and the like.
Disclosure of Invention
Therefore, a nanofiltration device, a nanofiltration front-end high-chloride mine water treatment system and a nanofiltration front-end high-chloride mine water treatment process are needed to be provided, wherein monovalent salt and divalent salt can be separated more thoroughly, and the operation difficulty is low.
A nanofiltration device comprises a first-stage nanofiltration unit and a second-stage nanofiltration unit, wherein the first-stage nanofiltration unit comprises a first-stage nanofiltration component, a second-stage nanofiltration component and a third-stage nanofiltration component which are sequentially communicated in series, the first-stage nanofiltration component is connected with the first-stage pretreatment unit, the first-stage nanofiltration component, the second-stage nanofiltration component and the third-stage nanofiltration component are respectively connected with the second-stage nanofiltration unit, and the second-stage nanofiltration unit is used for being connected with a concentration device.
In one embodiment, the nanofiltration device further comprises a weak acid cation bed device connected in series between the second stage nanofiltration assembly and the second stage nanofiltration assembly.
A nanofiltration pre-positioned mine water treatment system comprises a pretreatment device, a concentration device, a sodium chloride crystallization device and a nanofiltration device;
the pretreatment device, the nanofiltration device, the concentration device and the sodium chloride crystallization device are sequentially connected; the second-stage nanofiltration unit is connected with a concentration device, the third-stage nanofiltration assembly is connected with a sodium sulfate crystallization device, and the sodium sulfate crystallization device is used for carrying out crystallization treatment on the final nanofiltration concentrated water from the third-stage nanofiltration assembly to obtain sodium sulfate.
In one embodiment, the pretreatment device comprises a first stage pretreatment unit connected to the front end of the nanofiltration device for removing suspended matter, scaling ions and fluoride from the mine water.
In one embodiment, the first stage pretreatment unit comprises one or more of a high-density sedimentation tank, a V-shaped filter tank, a D-shaped filter tank, sand filtration, a multi-medium filter and an ultrafiltration device;
and/or the pretreatment device comprises a second-stage pretreatment unit, the second-stage pretreatment unit is connected between the concentration device and the sodium chloride crystallization device in series, and the second-stage pretreatment unit is used for removing scaling ions, COD (chemical oxygen demand) and fluoride in nanofiltration product water of the nanofiltration device.
In one embodiment, the second stage pretreatment unit comprises one or more of a high-density sedimentation tank device, a V-shaped filter tank, a D-shaped filter tank, a sand filter, a multi-medium filter and an ultrafiltration device, wherein the high-density sedimentation tank device, the V-shaped filter tank, the D-shaped filter tank, the sand filter, the multi-medium filter and the ultrafiltration device are used for removing scaling ions and fluorides in nanofiltration produced water, and the advanced oxidation device is used for removing COD in the nanofiltration concentrated water.
In one embodiment, the nanofiltration pre-positioned mine water treatment system further comprises an adjusting tank, the adjusting tank is connected to the front end of the first-stage pretreatment unit, and the adjusting tank is used for buffering and adjusting mine water.
In one embodiment, the nanofiltration pre-mode mine water treatment system further comprises a mixed salt crystallization device, wherein the mixed salt crystallization device is connected with the sodium chloride crystallization device and is used for treating sodium chloride crystallization mother liquor from the sodium chloride crystallization device to produce mixed salt;
and/or the mixed salt crystallization device is one or more of a single-effect evaporation crystallization device, a multi-effect evaporation crystallization device, MVR and TVR.
In one embodiment, the nanofiltration pre-mode mine water treatment system further comprises a sodium sulfate crystallization device, wherein the sodium sulfate crystallization device is connected with the nanofiltration device and is used for carrying out crystallization treatment on final nanofiltration concentrated water from the nanofiltration device and producing sodium sulfate;
and/or the sodium sulfate crystallization device is also connected with a miscellaneous salt crystallization device;
and/or the sodium sulfate crystallization device is one or more of a triple-effect evaporative crystallization device, a single-effect evaporative crystallization device, MVR and TVR.
In one embodiment, the pretreatment device further comprises a third stage pretreatment unit, the third stage pretreatment unit is connected in series between the nanofiltration device and the sodium sulfate crystallization device, and the third stage pretreatment unit is used for removing COD and fluoride in the final nanofiltration concentrated water.
In one embodiment, the concentration device is one or more of a multi-stage reverse osmosis membrane element, a high pressure reverse osmosis membrane element, a DTRO membrane element, and electrodialysis.
In one embodiment, the sodium chloride evaporative crystallization device is one or more of a reverse osmosis concentration device, a three-effect evaporative crystallization device, a single-effect evaporative crystallization device, an MVR evaporator, a TVR evaporator, a DTRO device, a reverse osmosis device, a high-pressure reverse osmosis device and an electrodialysis device.
A nanofiltration pre-positioned mine water treatment process comprises the following steps:
the method comprises the steps that mine water is pretreated by a pretreatment device to remove suspended matters, scaling ions, fluorides and COD in the mine water, the pretreated mine water enters a nanofiltration device to be subjected to multistage nanofiltration treatment to intercept divalent ions in the mine water, nanofiltration water produced by the nanofiltration device is desalted by a concentration device and then directly recycled or discharged up to standard, the nanofiltration water produced by the nanofiltration device enters a concentration device to be subjected to concentration treatment, and the concentrated water produced by the concentration device enters a sodium chloride crystallization device to be subjected to crystallization treatment to produce sodium chloride.
In one embodiment, the method further comprises the following steps:
the mine water is subjected to primary pretreatment through a first-stage pretreatment unit to remove suspended matters, scaling ions and fluorides in the mine water, the pretreated mine water enters a nanofiltration device to be subjected to multi-stage nanofiltration treatment to intercept divalent ions in the mine water, nanofiltration produced water of the nanofiltration device is directly recycled or discharged after reaching standards after being desalted through a concentration device, concentrated water of the concentration device enters a second-stage pretreatment unit to be subjected to secondary pretreatment to remove scaling ions, COD (chemical oxygen demand) and fluorides in the nanofiltration produced water, and the nanofiltration produced water subjected to secondary pretreatment enters a sodium chloride crystallization device to be subjected to crystallization treatment.
In one embodiment, the method further comprises the following steps: and the sodium chloride crystallization mother liquor of the sodium chloride crystallization device enters a mixed salt crystallization device for crystallization treatment to produce mixed salt.
In one embodiment, the method further comprises the following steps: and the mine water enters the first-stage pretreatment unit after being buffered and regulated by the regulating reservoir.
In one embodiment, the multi-stage nanofiltration treatment of the nanofiltration device comprises the following steps:
the mine water pretreated by the first-stage pretreatment unit enters a first-stage nanofiltration component for first-stage nanofiltration treatment, first-stage nanofiltration produced water of the first-stage nanofiltration component enters a second-stage nanofiltration unit, hardness of first-stage nanofiltration concentrated water of the first-stage nanofiltration component is removed through a weak acid cation bed, the first-stage nanofiltration concentrated water enters a second-stage nanofiltration component for first-stage nanofiltration treatment, second-stage nanofiltration produced water of the second-stage nanofiltration component enters the second-stage nanofiltration unit, second-stage nanofiltration concentrated water of the second-stage nanofiltration component enters a third-stage nanofiltration component for third-stage nanofiltration treatment, third-stage nanofiltration produced water of the third-stage nanofiltration component enters the second-stage nanofiltration unit, and the third-stage nanofiltration concentrated water of the third-stage nanofiltration component enters a sodium sulfate crystallization device for crystallization treatment to obtain sodium sulfate.
The mine water treatment system with the nanofiltration preposition mode can realize more thorough separation of monovalent salt and divalent salt, and has low operation difficulty. The nanofiltration device of the mine water treatment system with the nanofiltration preposition mode is designed according to multistage and multistage design, the mine water with relatively low TDS content is high in recovery rate, divalent salts of final nanofiltration concentrated water occupy most of the mine water, and monovalent salts of nanofiltration produced water occupy most of the mine water.
The mine water treatment system with the nanofiltration preposition mode has the following beneficial effects:
(1) according to the invention, the mine water is pretreated and then directly enters the nanofiltration device for treatment, so that on one hand, the content of monovalent salt in the final nanofiltration concentrated water is reduced, on the other hand, the content of divalent salt in the nanofiltration produced water is reduced, and the monovalent salt and the divalent salt are separated to the greatest extent.
(2) The invention creatively combines the multistage nanofiltration device with the weak acid cation bed device, reduces the treatment scale of the weak acid cation bed device and ensures the operation stability of the final process route of nanofiltration concentrated water.
(3) Compared with the conventional mine water zero discharge system, the method has the advantages of obviously shortened process flow, obviously reduced energy consumption and medicament consumption, simple operation and low cost.
Drawings
Fig. 1 is a schematic view of a nanofiltration pre-positioned mine water treatment system according to an embodiment of the invention.
Description of the reference numerals
10. A nanofiltration pre-positioned mine water treatment system; 100. a nanofiltration device; 110. a first stage nanofiltration unit; 111. a first stage nanofiltration assembly; 112. a second section of nanofiltration component; 113. a third nanofiltration assembly; 120. a second stage nanofiltration unit; 200. a concentration device; 300. a sodium chloride crystallization device; 400. a first stage preprocessing unit; 500. a second stage pre-processing unit; 600. a third stage pretreatment unit; 700. a regulating tank; 800. a miscellaneous salt crystallization device; 900. a sodium sulfate crystallization device; 1000. weak acid cation bed device.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
In the description of the present invention, it should be understood that the terms used in the present invention are used in the description of the present invention, and it should be understood that the directions or positional relationships indicated by the terms "center", "upper", "lower", "bottom", "inner", "outer", etc. in the present invention are based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention.
It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, which are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening components, or they may be in communication within two elements, i.e., when an element is referred to as being "secured to" another element, it may be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Those skilled in the art can understand the specific meaning of the above terms in the present invention in specific cases.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a nanofiltration device 100 according to an embodiment of the present invention is provided.
A nanofiltration device 100 comprises a first-stage nanofiltration unit 110 and a second-stage nanofiltration unit 120, wherein the first-stage nanofiltration unit 110 comprises a first-stage nanofiltration component 111, a second-stage nanofiltration component 112 and a third-stage nanofiltration component 113 which are sequentially communicated in series, the first-stage nanofiltration component 111 is connected with a first-stage pretreatment unit 400, the first-stage nanofiltration component 111, the second-stage nanofiltration component 112 and the third-stage nanofiltration component 113 are further respectively connected with the second-stage nanofiltration unit 120, and the second-stage nanofiltration unit 120 is used for being connected with a concentration device 200.
In one embodiment, the nanofiltration device 100 further comprises a weak acid cation bed device 1000, the weak acid cation bed device 1000 being connected in series between the second-stage nanofiltration module 112 and the second-stage nanofiltration module 112.
Referring to fig. 1, an embodiment of the present invention provides a mine water treatment system 10 with a nanofiltration pre-positioned mode.
Referring to fig. 1, a mine water treatment system 10 with a nanofiltration pre-treatment mode comprises a pretreatment device, a concentration device 200, a sodium chloride crystallization device 300 and a nanofiltration device 100;
the pretreatment device, the nanofiltration device 100, the concentration device 200 and the sodium chloride crystallization device 300 are sequentially connected; the second-stage nanofiltration unit 120 is connected with the concentration device 200, the third-stage nanofiltration assembly 113 is connected with a sodium sulfate crystallization device 900, and the sodium sulfate crystallization device 900 is used for performing crystallization treatment on the final nanofiltration concentrated water from the third-stage nanofiltration assembly 113 to obtain sodium sulfate.
Referring to fig. 1, in one specific example, the preprocessing apparatus includes a first stage preprocessing unit 400. The first stage pretreatment unit 400 is connected to the front end of the nanofiltration device 100, and the first stage pretreatment unit 400 is used for removing suspended matters, scaling ions and fluorides in mine water.
In one specific example, the first stage pretreatment unit 400 includes one or more of a high density settling tank, a V-bank filter, a D-bank filter, sand filtration, a multi-media filter, and an ultrafiltration device. The high-density sedimentation tank is used for reducing calcium ions in the mine water to be below 20.0mg/L, and the V-shaped filter tank and the ultrafiltration device are used for reducing the SDI of the mine water to be below 3 and the turbidity to be below 1 NTU.
Referring to fig. 1, in one embodiment, the preprocessing apparatus includes a second stage preprocessing unit 500. The second stage pretreatment unit 500 is connected in series between the nanofiltration device 100 and the concentration device 200, and the second stage pretreatment unit 500 is used for removing scaling ions, COD and fluorides in the nanofiltration product water of the nanofiltration device 100.
In one specific example, the second stage pretreatment unit 500 includes one or more of a high density sedimentation tank unit, a V-type filter, a D-type filter, sand filtration, a multi-media filter, and ultrafiltration unit, and an advanced oxidation unit. The high-density sedimentation tank device, the V-shaped filter tank, the D-shaped filter tank, the sand filter, the multi-medium filter and the ultrafiltration device are used for removing scaling ions and fluorides in nanofiltration produced water, and the advanced oxidation device is used for removing COD in the nanofiltration concentrated water.
Referring to fig. 1, in one embodiment, the nanofiltration pre-positioned mine water treatment system further comprises a conditioning tank 700. The adjusting tank 700 is connected to the front end of the first-stage pretreatment unit 400, and the adjusting tank 700 is used for buffering and adjusting mine water.
Referring to fig. 1, in one embodiment, a nanofiltration device 100 includes a first stage nanofiltration unit 110 and a second stage nanofiltration unit 120. The first-stage nanofiltration unit 110 comprises a first-stage nanofiltration component 111, a second-stage nanofiltration component 112 and a third-stage nanofiltration component 113 which are sequentially communicated in series, the first-stage nanofiltration component 111 is connected with the first-stage pretreatment unit 400, the first-stage nanofiltration component 111, the second-stage nanofiltration component 112 and the third-stage nanofiltration component 113 are also respectively connected with the second-stage nanofiltration unit 120, and the second-stage nanofiltration unit 120 is connected with the concentration device 200;
in one specific example, the third nanofiltration module 113 is further connected to a sodium sulfate crystallization device 900. The sodium sulfate crystallization apparatus 900 is used to perform a crystallization process on the final nanofiltration concentrated water from the third stage nanofiltration assembly 113 to obtain sodium sulfate.
Referring to fig. 1, in one embodiment, the nanofiltration pre-positioned mine water treatment system 10 further comprises a weak acid cation bed apparatus 1000. The weak acid cation bed apparatus 1000 is connected in series between the second nanofiltration module 112 and the second nanofiltration module 112.
Referring to fig. 1, in one embodiment, the nanofiltration pre-positioned mine water treatment system further comprises a miscellaneous salt crystallization device 800. The mixed salt crystallizing device 800 is connected with the sodium chloride crystallizing device 300, and the mixed salt crystallizing device 800 is used for processing the sodium chloride crystallizing mother liquor from the sodium chloride crystallizing device 300 to produce the mixed salt.
In one specific example, the mixed salt crystallization device 800 is one or more of a multi-effect evaporative crystallization device, MVR, and TVR.
In one specific example, the nanofiltration pre-mode mine water treatment system 10 further comprises a sodium sulfate crystallization device 900. The sodium sulfate crystallization device 900 is connected with the nanofiltration device 100, and the sodium sulfate crystallization device 900 is used for performing crystallization treatment on the final nanofiltration concentrated water from the nanofiltration device 100 and outputting sodium sulfate;
in one specific example, the sodium sulfate crystallization apparatus 900 is further connected to the miscellaneous salt crystallization apparatus 800.
In one specific example, the sodium sulfate crystallization device 900 is one or more of a triple effect evaporative crystallization device, a single effect evaporative crystallization device, MVR, and TVR.
Referring to fig. 1, in one specific example, the pretreatment apparatus further includes a third stage pretreatment unit 600. The third stage pretreatment unit 600 is connected in series between the nanofiltration device 100 and the sodium sulfate crystallization device 900, and the third stage pretreatment unit 600 is used for removing COD and fluoride in the final nanofiltration concentrated water.
In one specific example, the concentration device 200 is one or more of a multi-stage reverse osmosis membrane element, a high pressure reverse osmosis membrane element, a DTRO membrane element, and electrodialysis.
In one embodiment, the sodium chloride evaporative crystallization device is one or more of a reverse osmosis concentration device 200, a multi-effect evaporative crystallization device, an MVR evaporator, a TVR evaporator, a DTRO device, a reverse osmosis device, a high pressure reverse osmosis device, and an electrodialysis device.
The nanofiltration pre-positioned mine water treatment system 10 can realize more thorough separation of monovalent salt and divalent salt, and has low operation difficulty. The nanofiltration device 100 of the mine water treatment system 10 with the nanofiltration preposition mode is designed according to multistage and multistage design, realizes higher recovery rate of mine water with relatively low TDS content, and can realize that divalent salt of final nanofiltration concentrated water occupies most and monovalent salt of nanofiltration produced water occupies most.
The embodiment of the invention also provides a mine water treatment process in a nanofiltration preposition mode.
Referring to fig. 1, a mine water treatment process with nanofiltration pre-treatment mode includes the following steps:
the mine water is pretreated by a pretreatment device to remove suspended matters, scaling ions, fluorides and COD in the mine water, the pretreated mine water enters a nanofiltration device 100 to be subjected to multistage nanofiltration treatment to intercept divalent ions in the mine water, nanofiltration water produced by the nanofiltration device 100 is directly recycled or discharged after reaching standards after being desalted by a concentration device 200, the nanofiltration water produced by the nanofiltration device 100 enters the concentration device 200 to be subjected to concentration treatment, and the concentrated water produced by the concentration device 200 enters a sodium chloride crystallization device 300 to be subjected to crystallization treatment to produce sodium chloride.
In one specific example, the nanofiltration pre-mode mine water treatment process further comprises the following steps:
referring to fig. 1, mine water is subjected to a first pretreatment by a first-stage pretreatment unit 400 to remove suspended matters, scaling ions and fluorides in the mine water, the pretreated mine water enters a nanofiltration device 100 to be subjected to multi-stage nanofiltration treatment to intercept divalent ions in the mine water, nanofiltration product water of the nanofiltration device 100 is desalted by a concentration device 200 and then directly recycled or discharged after reaching standards, concentrated concentrate water of the concentration device 200 enters a second-stage pretreatment unit 500 to be subjected to a second pretreatment to remove scaling ions, COD and fluorides in the nanofiltration product water, and the nanofiltration product water subjected to the second pretreatment enters a sodium chloride crystallization device 300 to be subjected to crystallization treatment.
In one specific example, the nanofiltration pre-mode mine water treatment process further comprises the following steps: the mother liquor of sodium chloride crystallization in the sodium chloride crystallization device 300 enters the miscellaneous salt crystallization device 800 for crystallization treatment to produce miscellaneous salt.
In one specific example, the nanofiltration pre-mode mine water treatment process further comprises the following steps: the mine water enters the first-stage pretreatment unit 400 after being buffered and regulated by the regulating reservoir 700.
In one specific example, the multi-stage nanofiltration process of the nanofiltration device 100 comprises the steps of:
referring to fig. 1, mine water pretreated by a first-stage pretreatment unit 400 enters a first-stage nanofiltration component 111 for first-stage nanofiltration treatment, first-stage nanofiltration produced water of the first-stage nanofiltration component 111 enters a second-stage nanofiltration unit 120, first-stage nanofiltration concentrated water of the first-stage nanofiltration component 111 enters a second-stage nanofiltration component 112 for first-stage nanofiltration treatment after the hardness of the first-stage nanofiltration concentrated water is removed by a weak acid cation bed, second-stage nanofiltration produced water of the second-stage nanofiltration component 112 enters the second-stage nanofiltration unit 120, second-stage nanofiltration concentrated water of the second-stage nanofiltration component 112 enters a third-stage nanofiltration component 113 for third-stage nanofiltration treatment, third-stage nanofiltration produced water of the third-stage nanofiltration component 113 enters the second-stage nanofiltration unit 120, and third-stage nanofiltration concentrated water of the third-stage nanofiltration component 113 enters a sodium sulfate crystallization device 900 for crystallization treatment to obtain sodium. The second stage nanofiltration concentrated water of the second stage nanofiltration unit 120 enters the first stage nanofiltration assembly 111 again.
The method mainly aims at treating the mine water, the mine water enters a first-stage pretreatment unit 400 after being buffered and regulated by a regulating reservoir 700, and suspended matters, scaling ions and fluoride in the mine water are preliminarily removed; after the pretreatment of the first-stage pretreatment unit 400, the mine water enters the nanofiltration device 100 for treatment, the nanofiltration device 100 is designed according to multiple stages and multiple sections, the multiple sections are used for realizing high recovery rate of the mine water with relatively low TDS content and performing negative interception on monovalent salt, divalent salt of the final nanofiltration concentrated water occupies most parts, and the multiple-stage design is used for continuously feeding the multi-section designed produced water into the second-stage nanofiltration device 100 to further purify the produced water, so that the monovalent salt of the nanofiltration produced water occupies most parts. A weak acid cation bed device 1000 is designed at the rear end of the first section nanofiltration component 111 to deeply remove scaling ions such as calcium, magnesium and the like in the first section nanofiltration concentrated water; the final nanofiltration water product enters a concentration device 200 to realize concentration of the final nanofiltration water product, so that the treatment scales of a second-stage pretreatment unit 500 and a sodium chloride crystallization device 300 are reduced; after being concentrated by the concentration device 200, the concentrated water enters the second-stage pretreatment unit 500 to remove scaling ions, fluorides and the like in the concentrated water; after being treated by the second-stage pretreatment unit 500, the water produced by the second-stage pretreatment unit 500 enters the sodium chloride crystallization device 300 to produce high-purity sodium chloride, and the sodium chloride crystallization mother liquor produced by the sodium chloride crystallization device 300 enters the miscellaneous salt crystallization device 800; the final nanofiltration concentrated water of the third nanofiltration component 113 enters a third-stage pretreatment unit 600 to remove COD, fluoride and the like in the final nanofiltration concentrated water; after being treated by the third-stage pretreatment unit 600, the final nanofiltration concentrated water enters a sodium sulfate crystallization device 900 to produce high-purity sodium sulfate, and the produced sodium sulfate crystallization mother liquor and sodium chloride crystallization mother liquor enter a mixed salt crystallization device 800 together to produce a small amount of mixed salt.
Example 1
The embodiment provides a mine water treatment process in a nanofiltration pre-treatment mode.
A nanofiltration pre-positioned mine water treatment process is used for treating coal mine wastewater.
The coal mine wastewater is detected to have the following water quality conditions: COD: 16.0 mg/L; pH: 7.2; ca2+： 51.9mg/L；Mg2+：13.6mg/L；Na+：804.1mg/L；K+：7.9mg/L；Cl-：867.2mg/L； SO4 2-：685.0mg/L；NO3 -：6.8mg/L；F-：3.3mg/L；SiO2：9.5mg/L；TDS：2449.4mg/L。
The treatment process comprises the following steps:
please refer to fig. 1.
(1) The coal mine wastewater firstly enters a regulating tank 700 for buffering and regulating treatment, and the inflow rate is 1250m3And/h, the retention time of the coal mine wastewater in the regulating reservoir 700 is 4 h.
(2) The coal mine wastewater enters a first-stage pretreatment unit 400 after being buffered and regulated by a regulating reservoir 700, in the embodiment, the first-stage pretreatment unit 400 comprises a high-density sedimentation tank, a V-shaped filter tank and an ultrafiltration device, the total hardness in the coal mine wastewater is reduced to be less than 100.0mg/L by adding sodium hydroxide and sodium carbonate into the high-density sedimentation tank, and then the coal mine wastewater passes through the V-shaped filter tank and the ultrafiltration deviceThe system of straining filters, makes mine water SDI drop to below 3, and the turbidity drops to below 1NTU to ensure follow-up membrane system steady operation, in this embodiment, the product water quality of first order preprocessing unit 400 is as follows: pH: 7.5; ca2+：19.30mg/L； Mg2+：9.5mg/L；Na+：1075.3mg/L；K+：7.93mg/L；Cl-：1217.2mg/L；SO4 2-： 685.0mg/L；NO3 -：6.8mg/L；F-：3.3mg/L；SiO2：9.53mg/L；COD：16.0mg/L。
(3) The nanofiltration water enters the nanofiltration device 100 after being pretreated by the first-stage pretreatment unit 400, in this embodiment, the multi-stage nanofiltration system is designed according to two stages and three sections, wherein the first-stage recovery rate is 80%, the second-stage recovery rate is 80%, the third-stage recovery rate is 76%, the second-stage recovery rate is 85%, and the final nanofiltration water quality is as follows in table 1:
table 1 final nanofiltration water production quality table of nanofiltration device 100
Figure BDA0002705757350000111
As can be seen from the above table, the final nanofiltration yields Cl-/SO4 2-1225.68/14.75, saltpeter ratio (NaCl/Na)2SO4) The sodium chloride accounts for more than 97.7 percent when the ratio is 83.1/1. The three-stage nanofiltration concentrated water is used as the final nanofiltration concentrated water of the nanofiltration device 100, and due to the negative interception effect of the third-stage nanofiltration component 113, the chloride ion concentration of the three-stage nanofiltration produced water is higher than that of the three-stage nanofiltration inlet water (namely, the two-stage nanofiltration concentrated water), and the final nanofiltration concentrated water (namely, the three-stage nanofiltration concentrated water) is Cl-/SO4 2-473.96/59460.63, saltpeter ratio (NaCl/Na)2SO4) 1/125.5, and the final sodium sulfate in the nanofiltration concentrated water accounts for more than 99.0 percent. The final nanofiltration water (i.e., the nanofiltration water of the second nanofiltration unit 120) enters the concentration device 200 to reduce the treatment scale of the second pretreatment unit 500 and the sodium chloride crystallization device 300; the final nanofiltration concentrate (i.e., the three-stage nanofiltration concentrate) enters a third stage pretreatment unit 600 to ensure a subsequent concentration device 200 and sodium sulfateThe crystallization apparatus 900 is stably operated.
(4) In this embodiment, the concentration device 200 is a multi-stage reverse osmosis membrane element, and other items may be a device having similar functions, such as a high pressure reverse osmosis membrane element, a DTRO membrane element, and electrodialysis, and the concentration device 200 may concentrate the water to a concentration level of 1235.9m3The/h is reduced to 92.7m3And/h, the TDS of the concentrated produced water is 103.7mg/L, the TDS completely reaches the recycling and discharge standards, and the water quality of the concentrated water is as follows: pH: 7.5; ca2+：7.9mg/L；Mg2+：3.9mg/L；Na+：10170.2mg/L；K+：98.7mg/L；Cl-：15586.5mg/L； SO4 2-：187.5mg/L；NO3 -：87.35mg/L；F-：41.2mg/L；SiO2：118.6mg/L；COD： 97.9mg/L。
(5) After being concentrated by the concentration device 200, the concentrated water enters the second-stage pretreatment unit 500, in this embodiment, the second-stage pretreatment unit 500 includes a high-density sedimentation tank for removing silicon dioxide and fluoride in the concentrated water, in other embodiments, the second-stage pretreatment unit 500 can also be used as a device having similar functions, such as a tubular micro-filtration membrane, a tubular ultrafiltration membrane, and the like, for pretreating evaporative crystallization; after passing through the second stage pretreatment unit 500, the quality of the concentrated water is as follows: pH: 7.2; ca2+：7.9mg/L； Mg2+：3.9mg/L；Na+：10148.8mg/L；K+：98.7mg/L；Cl-：15586.5mg/L；SO4 2-： 187.5mg/L；NO3 -：87.4mg/L；F-：5.0mg/L；SiO2：10.0mg/L；COD：97.9mg/L。
(6) After being treated by the second stage pretreatment unit 500, the concentrated water enters the sodium chloride crystallization device 300, in this embodiment, the sodium chloride crystallization device 300 includes a reverse osmosis concentration device 200 and a triple effect evaporation crystallization device, other items can be replaced by the concentration devices 200 having similar functions, such as a single effect evaporation, an MVR evaporator, a TVR evaporator, a DTRO device, a reverse osmosis and high pressure reverse osmosis device, and an electrodialysis device, etc., and the sodium chloride crystallization device 300 produces 2.15t/h of sodium chloride, purity: 98.9%, moisture: 0.2%, water-insoluble matter: 0.02%, total amount of calcium and magnesium ions: 0.11%, sulfate ion: 0.14%, TOC: 25mg/kg, whiteness: 81.2% ammonium (as NH)4 +Meter): 1.2mg/KG, iodine (as I): 0.2mg/kg, barium (as Ba): 0.81mg/kg, iron (as Fe): 0.43mg/kg, reaches the primary standard of industrial dry salt in GB/T5642-2016 industrial salt, and simultaneously meets the primary standard of dry salt in T/CCT 002-2019 coal chemical industry byproduct industrial sodium chloride. Residual mother liquor 0.8m3The water quality of the mother liquor is as follows: pH: 7.9; ca2+：944.5mg/L；Mg2+：463.9mg/L；Na+： 124012.6mg/L；K+：11845.8mg/L；Cl-：182051.3mg/L；SO4 2-：22503.5mg/L； NO3 -：10482.2mg/L；F-：601.0mg/L；SiO2: 123.4 mg/L; COD: 11751.0mg/L, the sodium chloride mother liquor enters the miscellaneous salt crystallization device 800.
(7) The three-stage nanofiltration concentrated water (i.e. the final nanofiltration concentrated water) of the third nanofiltration component 113 enters a sodium sulfate crystallization device 900, in this embodiment, the sodium sulfate crystallization device 900 used is a triple-effect evaporation crystallization device, in other embodiments, a single-effect evaporation crystallization device, MVR, TVR, or other devices with similar functions may also be used, in this embodiment, the sodium sulfate crystallization device 900 produces sodium sulfate at 1.16t/h, purity: 99.16%, water insoluble: 0.011%, calcium and magnesium: 0.15%, chloride: 0.18%, iron: 0.0007%, moisture: 0.13%, whiteness: 87.2%, TOC: 34mg/kg, reaches the first-class product standard of GB/T6009-2014 industrial anhydrous sodium sulfate class I, and simultaneously meets the first-class product standard of T/CCT 001-2019 coal chemical industry byproduct industrial sodium sulfate class II. In this embodiment, the sodium sulfate crystallization device 900 produces 0.33m of sodium sulfate crystallization mother liquor3The mother liquor water quality is as follows: pH: 7.8 of; ca2+：371.0mg/L；Mg2+：148.4mg/L；Na+：90682.9mg/L； K+：1130.3mg/L；Cl-：6636.3mg/L；SO4 2-：182816.9mg/L；NO3 -：37.1mg/L； F-：251.3mg/L；SiO2：123.5mg/L；COD：11156.9mg/L。
(8) The sodium sulfate crystallization mother liquor and the sodium chloride crystallization mother liquor enter the mixed salt crystallization device 800 together, in the embodiment, the mixed salt crystallization device 800 uses a single-effect evaporation crystallization device, in other embodiments, the mixed salt crystallization device 800 can also use a multi-effect evaporation crystallization device, MVR, TVR or other devices with similar functions, the mixed salt crystallization device 800 finally produces the mixed salt at 0.36t/h, the integral mixed salt rate of the project is 9.84%, and the hazardous waste treatment cost is greatly reduced.
This example finally produced 2.16t/h sodium chloride, 1.16t/h sodium sulfate, 0.36t/h miscellaneous salts.
In summary, the nanofiltration pre-positioned mine water treatment system 10 of the present invention has the following beneficial effects:
(1) according to the invention, the mine water is pretreated and then directly enters the nanofiltration device 100 for treatment, so that the content of monovalent salt in the final nanofiltration concentrated water is reduced on one hand, and the content of divalent salt in the nanofiltration produced water is reduced on the other hand, and the monovalent salt and the divalent salt are separated to the greatest extent.
(2) The invention creatively combines the multistage multi-section nanofiltration device 100 with the weak acid cation bed device 1000, reduces the processing scale of the weak acid cation bed device 1000 and simultaneously ensures the operation stability of the process route of the final nanofiltration concentrated water.
(3) Compared with the conventional mine water zero discharge system, the method has the advantages of obviously shortened process flow, obviously reduced energy consumption and medicament consumption, simple operation and low cost.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (17)

1. A nanofiltration device is characterized by comprising a first-stage nanofiltration unit and a second-stage nanofiltration unit, wherein the first-stage nanofiltration unit comprises a first-stage nanofiltration component, a second-stage nanofiltration component and a third-stage nanofiltration component which are sequentially communicated in series, and the first-stage nanofiltration component, the second-stage nanofiltration component and the third-stage nanofiltration component are further respectively connected with the second-stage nanofiltration unit.
2. The nanofiltration device of claim 1, further comprising a weak acid cation bed device connected in series between the second-stage nanofiltration assembly and the second-stage nanofiltration assembly.
3. A nanofiltration pre-positioned mine water treatment system is characterized by comprising a pretreatment device, a concentration device, a sodium chloride crystallization device and a nanofiltration device according to any one of claims 1 to 2;
the pretreatment device, the nanofiltration device, the concentration device and the sodium chloride crystallization device are sequentially connected; the second-stage nanofiltration unit is connected with a concentration device, the third-stage nanofiltration assembly is connected with a sodium sulfate crystallization device, and the sodium sulfate crystallization device is used for carrying out crystallization treatment on the final nanofiltration concentrated water from the third-stage nanofiltration assembly to obtain sodium sulfate.
4. The nanofiltration pre-positioned mode mine water treatment system according to claim 3, wherein the pretreatment device comprises a first stage pretreatment unit, the first stage pretreatment unit is connected to the front end of the nanofiltration device, and the first stage pretreatment unit is used for removing suspended matters, scaling ions and fluorides in mine water.
5. The nanofiltration pre-positioned mine water treatment system according to claim 4, wherein the first-stage pretreatment unit comprises one or more of a high-density sedimentation tank, a V-shaped filter tank, a D-shaped filter tank, sand filtration, a multi-media filter and an ultrafiltration device;
and/or the pretreatment device comprises a second-stage pretreatment unit, the second-stage pretreatment unit is connected between the concentration device and the sodium chloride crystallization device in series, and the second-stage pretreatment unit is used for removing scaling ions, COD (chemical oxygen demand) and fluoride in nanofiltration product water of the nanofiltration device.
6. The mine water treatment system with nanofiltration front-end mode according to claim 5, wherein the second-stage pretreatment unit comprises one or more of a high-density sedimentation tank device, a V-shaped filter tank, a D-shaped filter tank, a sand filter, a multi-media filter, an ultrafiltration device and an advanced oxidation device, the high-density sedimentation tank device, the V-shaped filter tank, the D-shaped filter tank, the sand filter, the multi-media filter and the ultrafiltration device are used for removing scaling ions and fluorides in nanofiltration production water, and the advanced oxidation device is used for removing COD in the concentrated nanofiltration water.
7. The nanofiltration pre-positioned mode mine water treatment system according to any one of claims 4 to 6, further comprising an adjusting tank connected to the front end of the first stage pretreatment unit, wherein the adjusting tank is used for buffering and adjusting mine water.
8. The nanofiltration pre-positioned mode mine water treatment system according to any one of claims 3 to 6, further comprising a miscellaneous salt crystallization device connected with the sodium chloride crystallization device, wherein the miscellaneous salt crystallization device is used for treating sodium chloride crystallization mother liquor from the sodium chloride crystallization device to produce miscellaneous salts;
and/or the mixed salt crystallization device is one or more of a single-effect evaporation crystallization device, a multi-effect evaporation crystallization device, MVR and TVR.
9. The nanofiltration pre-positioned mode mine water treatment system according to any one of claims 3 to 6, further comprising a sodium sulfate crystallization device connected with the nanofiltration device, wherein the sodium sulfate crystallization device is used for carrying out crystallization treatment on final nanofiltration concentrated water from the nanofiltration device and producing sodium sulfate;
and/or the sodium sulfate crystallization device is also connected with a miscellaneous salt crystallization device;
and/or the sodium sulfate crystallization device is one or more of a triple-effect evaporative crystallization device, a single-effect evaporative crystallization device, MVR and TVR.
10. The nanofiltration pre-positioned mode mine water treatment system according to claim 9, wherein the pretreatment device further comprises a third stage pretreatment unit, the third stage pretreatment unit is connected in series between the nanofiltration device and the sodium sulfate crystallization device, and the third stage pretreatment unit is used for removing COD and fluoride in the final nanofiltration concentrated water.
11. The nanofiltration pre-positioned mode mine water treatment system according to any one of claims 3 to 6, wherein the concentration device is one or more of a multi-stage reverse osmosis membrane element, a high pressure reverse osmosis membrane element, a DTRO membrane element and electrodialysis.
12. The nanofiltration pre-positioned mode mine water treatment system according to any one of claims 3 to 6, wherein the sodium chloride evaporative crystallization device is one or more of a reverse osmosis concentration device, a triple effect evaporative crystallization device, a single effect evaporative crystallization device, an MVR evaporator, a TVR evaporator, a DTRO device, a reverse osmosis device, a high pressure reverse osmosis device and an electrodialysis device.
13. A mine water treatment process in a nanofiltration pre-positioned mode is characterized by comprising the following steps:
the method comprises the steps that mine water is pretreated through a pretreatment device to remove suspended matters, scaling ions, fluorides and COD in the mine water, the pretreated mine water enters a nanofiltration device to be subjected to multistage nanofiltration treatment to intercept divalent ions in the mine water, nanofiltration water produced by the nanofiltration device is desalted through a concentration device and then directly recycled or discharged up to standard, the nanofiltration water produced by the nanofiltration device enters a concentration device to be subjected to concentration treatment, and the concentrated water produced by the concentration device enters a sodium chloride crystallization device to be subjected to crystallization treatment to produce sodium chloride.
14. The nanofiltration pre-positioned mine water treatment process according to claim 13, further comprising the steps of:
the mine water is subjected to primary pretreatment through a first-stage pretreatment unit to remove suspended matters, scaling ions and fluorides in the mine water, the pretreated mine water enters a nanofiltration device to be subjected to multi-stage nanofiltration treatment to intercept divalent ions in the mine water, nanofiltration water produced by the nanofiltration device is desalted through a concentration device and then directly recycled or discharged after reaching standards, concentrated water of the concentration device enters a second-stage pretreatment unit to be subjected to secondary pretreatment to remove scaling ions, COD (chemical oxygen demand) and fluorides in the nanofiltration water produced, and the nanofiltration water produced after the secondary pretreatment enters a sodium chloride crystallization device to be subjected to crystallization treatment.
15. The nanofiltration pre-positioned mine water treatment process according to claim 13, further comprising the steps of: and the sodium chloride crystallization mother liquor of the sodium chloride crystallization device enters a mixed salt crystallization device for crystallization treatment to produce mixed salt.
16. The nanofiltration pre-treatment mode mine water treatment process according to any one of claims 14 to 15, further comprising the steps of: and the mine water enters the first-stage pretreatment unit after being buffered and regulated by the regulating reservoir.
17. The nanofiltration pre-treatment mode mine water treatment process according to any one of claims 14 to 15, wherein the multi-stage nanofiltration treatment of the nanofiltration device comprises the following steps:
the mine water pretreated by the first-stage pretreatment unit enters a first-stage nanofiltration component for first-stage nanofiltration treatment, first-stage nanofiltration produced water of the first-stage nanofiltration component enters a second-stage nanofiltration unit, hardness of first-stage nanofiltration concentrated water of the first-stage nanofiltration component is removed through a weak acid cation bed, the first-stage nanofiltration concentrated water enters a second-stage nanofiltration component for first-stage nanofiltration treatment, second-stage nanofiltration produced water of the second-stage nanofiltration component enters the second-stage nanofiltration unit, second-stage nanofiltration concentrated water of the second-stage nanofiltration component enters a third-stage nanofiltration component for third-stage nanofiltration treatment, third-stage nanofiltration produced water of the third-stage nanofiltration component enters the second-stage nanofiltration unit, and the third-stage nanofiltration concentrated water of the third-stage nanofiltration component enters a sodium sulfate crystallization device for crystallization treatment to obtain sodium sulfate.
CN202011038037.5A 2020-09-28 2020-09-28 Nanofiltration device, and nanofiltration pre-mode mine water treatment system and process Pending CN112358103A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113173671A (en) * 2021-04-28 2021-07-27 四川美富特环境治理有限责任公司 Full-quantitative treatment system and treatment method for mine wastewater
CN115259460A (en) * 2022-08-02 2022-11-01 淮南矿业(集团)有限责任公司 Method for treating brackish mine water of coal mine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113173671A (en) * 2021-04-28 2021-07-27 四川美富特环境治理有限责任公司 Full-quantitative treatment system and treatment method for mine wastewater
CN115259460A (en) * 2022-08-02 2022-11-01 淮南矿业(集团)有限责任公司 Method for treating brackish mine water of coal mine
CN115259460B (en) * 2022-08-02 2024-05-14 淮南矿业(集团)有限责任公司 Treatment method of brackish mine water of coal mine

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