CN214299705U - Nanofiltration device and nanofiltration pre-mode mine water treatment system - Google Patents
Nanofiltration device and nanofiltration pre-mode mine water treatment system Download PDFInfo
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- CN214299705U CN214299705U CN202022174187.0U CN202022174187U CN214299705U CN 214299705 U CN214299705 U CN 214299705U CN 202022174187 U CN202022174187 U CN 202022174187U CN 214299705 U CN214299705 U CN 214299705U
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- 238000001728 nano-filtration Methods 0.000 title claims abstract description 255
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 174
- 238000002425 crystallisation Methods 0.000 claims abstract description 127
- 230000008025 crystallization Effects 0.000 claims abstract description 127
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 96
- 150000003839 salts Chemical class 0.000 claims abstract description 61
- 239000011780 sodium chloride Substances 0.000 claims abstract description 48
- 150000002500 ions Chemical class 0.000 claims abstract description 20
- 150000004673 fluoride salts Chemical class 0.000 claims abstract description 12
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 49
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 48
- 235000011152 sodium sulphate Nutrition 0.000 claims description 48
- 238000001223 reverse osmosis Methods 0.000 claims description 21
- 239000012528 membrane Substances 0.000 claims description 19
- 239000012452 mother liquor Substances 0.000 claims description 14
- 238000004062 sedimentation Methods 0.000 claims description 14
- 239000002253 acid Substances 0.000 claims description 13
- 150000001768 cations Chemical class 0.000 claims description 13
- 238000000108 ultra-filtration Methods 0.000 claims description 13
- 238000001704 evaporation Methods 0.000 claims description 12
- 230000008020 evaporation Effects 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 10
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims description 8
- 238000000909 electrodialysis Methods 0.000 claims description 8
- 230000003647 oxidation Effects 0.000 claims description 6
- 238000007254 oxidation reaction Methods 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 230000003139 buffering effect Effects 0.000 claims description 4
- 238000009287 sand filtration Methods 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
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- 239000001301 oxygen Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 24
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- 239000000047 product Substances 0.000 description 15
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- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 7
- 229910001425 magnesium ion Inorganic materials 0.000 description 7
- 238000011084 recovery Methods 0.000 description 7
- 239000000377 silicon dioxide Substances 0.000 description 7
- 229910052681 coesite Inorganic materials 0.000 description 6
- 229910052906 cristobalite Inorganic materials 0.000 description 6
- 238000007781 pre-processing Methods 0.000 description 6
- 229910052682 stishovite Inorganic materials 0.000 description 6
- 229910052905 tridymite Inorganic materials 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 238000013461 design Methods 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 238000002203 pretreatment Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
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- 229910052791 calcium Inorganic materials 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
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- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Inorganic materials [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
- 235000010333 potassium nitrate Nutrition 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000001471 micro-filtration Methods 0.000 description 1
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- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
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Abstract
The utility model discloses a nanofiltration device and nanofiltration pre-mode mine water treatment system. 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
Technical Field
The utility model relates to a water treatment field especially relates to a nanofiltration device and nanofiltration leading mode mine water processing system.
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 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 the difference is 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.
SUMMERY OF THE UTILITY MODEL
Therefore, a nanofiltration device and a nanofiltration front-end high-chloride mine water treatment system which can realize more thorough separation of monovalent salt and divalent salt and have low operation difficulty are needed to be provided.
A nanofiltration device comprises a first stage nanofiltration unit and a second stage nanofiltration unit, wherein the first stage nanofiltration unit comprises a first section nanofiltration component, a second section nanofiltration component and a third section nanofiltration component which are sequentially communicated in series, the first section nanofiltration component is connected with the first stage pretreatment unit, the first section nanofiltration component, the second section nanofiltration component and the third section 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, 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 fluoride in 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, an ultrafiltration device and an advanced oxidation 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, wherein the adjusting tank is connected to the front end of the first-stage pretreatment unit and 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 the 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 crystallization device is one or more of a reverse osmosis concentration device, a three-effect evaporation crystallization device, a single-effect evaporation 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 utility model discloses a receive and strain leading mode mine water processing system and can make monovalent salt and divalent salt realize more thorough separation, the operation degree of difficulty is low. The utility model discloses nanofiltration device of nanofiltration leading mode mine water processing system designs according to multistage, realizes higher rate of recovery with the mine water that TDS content is lower relatively, can realize finally that the divalent salt of nanofiltration dense water occupies the overwhelming majority, and the monovalent salt of nanofiltration product water occupies the overwhelming majority.
The utility model discloses a receive and strain leading mode mine water processing system has following beneficial effect:
(1) the utility model discloses with the mine water after the preliminary treatment, directly get into the nanofiltration device and handle, on the one hand, reduce the monovalent salt content of finally receiving the concentrated water of receiving the filtration, on the other hand has reduced the content of receiving the divalent salt of receiving the filtration product water, realizes monovalent salt and the separation of divalent salt at utmost.
(2) The utility model discloses creative receive multistage nanofiltration device and weak acid cation bed device combines, when reducing weak acid cation bed device treatment scale, has ensured the operational stability of the process route of finally receiving the dense water of straining.
(3) The utility model discloses more conventional mine water zero discharge system, process obviously shortens, and energy consumption, medicament consumption obviously reduce, easy operation, it is with low costs.
Drawings
Fig. 1 is a schematic view of a nanofiltration pre-mode mine water treatment system according to an embodiment of the present 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
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The 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 terms "center", "upper", "lower", "bottom", "inner", "outer" and the like used in the present invention are used as the terms of the orientation or the positional relationship shown in the drawings, and are only used for convenience of description and simplification of the description, but do not indicate or imply that the device or the element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be interpreted 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, and these terms 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, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening elements, 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. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
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, one embodiment of the present invention provides a nanofiltration device 100.
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 sedimentation tank, a V-type filter, a D-type filter, sand filtration, a multi-media filter, and an ultrafiltration device. The high-density sedimentation tank is used for reducing calcium ions in 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 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 crystallization device 300 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 utility model discloses a receive and strain leading mode mine water processing system 10 and can make monovalent salt and divalent salt realize more thorough separation, the operation degree of difficulty is low. The utility model discloses nanofiltration device 100 of nanofiltration leading mode mine water processing system 10 designs according to multistage, realizes higher rate of recovery with the mine water that TDS content is lower relatively, can realize that the divalent salt of finally nanofiltration dense water occupies the overwhelming majority, and the monovalent salt of nanofiltration product water occupies the overwhelming majority.
The embodiment of the utility model also provides a nanofiltration pre-mode mine water treatment process.
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 desalted by a concentration device 200 and then directly recycled or discharged after reaching standards, 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 water produced by 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 being subjected to hardness removal by a weak acid cation bed, second-stage nanofiltration water produced by 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 water produced by 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 sulfate. The second stage nanofiltration concentrated water of the second stage nanofiltration unit 120 enters the first stage nanofiltration assembly 111 again.
The utility model mainly aims at treating 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 first order pretreatment unit 400 preliminary treatment, colliery mine water gets into nanofiltration device 100 and handles, the utility model discloses nanofiltration device 100 designs according to multistage, and the multistage effect realizes high rate of recovery for the mine water that will TDS content is lower relatively, and to the effect of holding back the burden of monovalent salt, the divalent salt that makes final nanofiltration dense water occupies most, and the effect of multistage design continues to get into second grade nanofiltration device 100 for the product water with the multistage design and further purifies the product water, and the monovalent salt that makes nanofiltration product water occupies most. A weak acid cation bed device 1000 is designed at the rear end of the first section nanofiltration component 111 to deeply remove scale-forming 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, fluorides 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 first enters the adjusting tank 700, carrying out buffering and adjusting treatment, wherein the inflow 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 this embodiment, the first-stage pretreatment unit 400 comprises a high-density sedimentation tank, a V-shaped filter tank and an ultrafiltration device, sodium hydroxide and sodium carbonate are added into the high-density sedimentation tank, the total hardness of the coal mine wastewater is reduced to be below 100.0mg/L, then the coal mine wastewater is filtered by the V-shaped filter tank and an ultrafiltration system, so that the SDI of the coal mine wastewater is reduced to be below 3, and the turbidity is reduced to be below 1NTU, so as to ensure the stable operation of a subsequent membrane system, in this embodiment, the quality of the produced water of the first-stage pretreatment 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
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 the concentration of chloride ions in the three-stage nanofiltration water is higher than that in the three-stage nanofiltration water (namely, the two-stage nanofiltration concentrated water) due to the negative interception effect of the third-stage nanofiltration component 113Chloride ion concentration, and final nanofiltration concentrated water (namely three-stage nanofiltration concentrated water) 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 concentrated water (i.e., the three-stage nanofiltration concentrated water) enters the third-stage pretreatment unit 600 to ensure stable operation of the subsequent concentration device 200 and the sodium sulfate crystallization device 900.
(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 silica 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 microfiltration 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 the treatment of 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 with similar functions, such as single effect evaporation, MVR evaporator, TVR evaporator, DTRO device, reverse osmosis and high pressure reverse osmosis device, electrodialysis device, etc., the sodium chloride crystallization device 300 produces 2.15t/h of sodium chloride, and the 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. The remaining mother liquor is 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 coal gasification of T/CCT 001-2019Industrial by-product sodium sulfate, class II first-class standard. In this embodiment, the sodium sulfate crystallization device 900 produces 0.33m of sodium sulfate crystallization mother liquor3The water quality of the mother liquor 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 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.
To sum up, the utility model discloses a receive and strain leading mode mine water processing system 10 has following beneficial effect:
(1) the utility model discloses with the mine water after the preliminary treatment, directly get into nanofiltration device 100 and handle, on the one hand, reduce the monovalent salt content of finally receiving the concentrated water of receiving the filtration, on the other hand has reduced the content of receiving the divalent salt of receiving the filtration product water, realizes monovalent salt and the separation of divalent salt at utmost.
(2) The utility model discloses creative receive multistage nanofiltration device 100 and combine with weak acid cation bed device 1000, when reducing weak acid cation bed device 1000 and handle the scale, ensured the operational stability of the process route of finally receiving the dense water of straining.
(3) The utility model discloses more conventional mine water zero discharge system, process obviously shortens, and energy consumption, medicament consumption obviously reduce, easy operation, it is with low costs.
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 represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (12)
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 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.
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Denomination of utility model: Nanofiltration device and pre filtration method for mine water treatment system Granted publication date: 20210928 Pledgee: Ordos Rural Commercial Bank Co.,Ltd. Pledgor: INNER MONGOLIA JIUKE KANGRUI ENVIRONMENTAL TECHNOLOGY Co.,Ltd. Registration number: Y2024980046867 |