CN220393471U - Treatment device for recycling concentrated water in coal chemical industry - Google Patents
Treatment device for recycling concentrated water in coal chemical industry Download PDFInfo
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- CN220393471U CN220393471U CN202321122915.0U CN202321122915U CN220393471U CN 220393471 U CN220393471 U CN 220393471U CN 202321122915 U CN202321122915 U CN 202321122915U CN 220393471 U CN220393471 U CN 220393471U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 160
- 238000004064 recycling Methods 0.000 title claims abstract description 21
- 239000003245 coal Substances 0.000 title claims abstract description 20
- 239000000126 substance Substances 0.000 title claims abstract description 19
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 70
- 239000012528 membrane Substances 0.000 claims abstract description 50
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- 230000008025 crystallization Effects 0.000 claims abstract description 45
- 238000001728 nano-filtration Methods 0.000 claims abstract description 45
- 150000003839 salts Chemical class 0.000 claims abstract description 39
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 38
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 38
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 38
- 239000011780 sodium chloride Substances 0.000 claims abstract description 35
- 229910001425 magnesium ion Inorganic materials 0.000 claims abstract description 30
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910001424 calcium ion Inorganic materials 0.000 claims abstract description 28
- 238000000926 separation method Methods 0.000 claims abstract description 21
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000011575 calcium Substances 0.000 claims abstract description 16
- 238000001223 reverse osmosis Methods 0.000 claims description 26
- 238000000909 electrodialysis Methods 0.000 claims description 25
- 238000001914 filtration Methods 0.000 claims description 25
- 238000000108 ultra-filtration Methods 0.000 claims description 16
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 14
- 239000013049 sediment Substances 0.000 claims description 14
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical group C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 claims description 13
- 239000012141 concentrate Substances 0.000 claims description 13
- 239000013505 freshwater Substances 0.000 claims description 12
- 238000001704 evaporation Methods 0.000 claims description 9
- 230000008020 evaporation Effects 0.000 claims description 8
- 239000002244 precipitate Substances 0.000 claims description 8
- 239000013078 crystal Substances 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 150000002500 ions Chemical class 0.000 claims description 4
- 239000004952 Polyamide Substances 0.000 claims description 3
- 239000004695 Polyether sulfone Substances 0.000 claims description 3
- 229920001328 Polyvinylidene chloride Polymers 0.000 claims description 3
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 claims description 3
- 229920002301 cellulose acetate Polymers 0.000 claims description 3
- 230000003750 conditioning effect Effects 0.000 claims description 3
- 229920002492 poly(sulfone) Polymers 0.000 claims description 3
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 3
- 229920002647 polyamide Polymers 0.000 claims description 3
- 229920006393 polyether sulfone Polymers 0.000 claims description 3
- 239000005033 polyvinylidene chloride Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 230000008014 freezing Effects 0.000 claims description 2
- 238000007710 freezing Methods 0.000 claims description 2
- 238000005342 ion exchange Methods 0.000 claims description 2
- 239000012716 precipitator Substances 0.000 claims description 2
- 239000012535 impurity Substances 0.000 abstract description 7
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000004065 wastewater treatment Methods 0.000 abstract description 2
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- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
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- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000003513 alkali Substances 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
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- 238000011109 contamination Methods 0.000 description 1
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- 238000000265 homogenisation Methods 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
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- 230000008569 process Effects 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The embodiment of the utility model relates to the technical field of coal chemical wastewater treatment, in particular to a treatment device for reclaimed water recycling concentrated water in coal chemical industry. In the embodiment of the application, the reclaimed water recycling concentrated water treatment device comprises a pretreatment unit, a membrane salt separation concentration unit, a sodium sulfate crystallization unit and a sodium chloride crystallization unit; the pretreatment unit removes calcium and magnesium ion impurities in the concentrated water, and the membrane salt separation concentration unit carries out salt separation treatment on the concentrated water; the pretreatment unit is used for removing impurities, so that the concentrated water treatment efficiency can be improved, the service life of the membrane in the membrane salt separation concentration unit can be prolonged, and the operation difficulty and cost can be reduced. Meanwhile, the embodiment of the application adopts nanofiltration to separate salt, and finally obtains sodium chloride products and sodium sulfate products, thereby realizing the recycling of concentrated water.
Description
Technical Field
The embodiment of the utility model relates to the technical field of coal chemical wastewater treatment, in particular to a treatment device for reclaimed water recycling concentrated water in coal chemical industry.
Background
The treatment mode of reclaimed water recycling concentrated water in the coal chemical industry mainly comprises the following two steps: 1) Through refluxing to the sewage device, homogenizing and then treating; however, the conventional sewage treatment process does not have the capability of removing salinity; 2) Direct evaporation crystallization; but the concentrated water has high salt content, seriously reduces the service efficiency and service life of evaporation equipment, has high equipment maintenance and replacement frequency, and finally the crystals are defined as dangerous waste by the country because of the complex content. The two treatment modes have no ideal treatment effect on the reclaimed water recycling concentrated water in the coal chemical industry.
Disclosure of Invention
In order to improve the treatment effect of reclaimed water reuse concentrated water in coal chemical industry, the embodiment of the application provides a treatment device of reclaimed water reuse concentrated water in coal chemical industry, which can separate sodium sulfate and sodium chloride in reclaimed water reuse concentrated water and obtain sodium chloride products and sodium sulfate products.
In order to solve the technical problems, the embodiment of the application provides the following technical scheme:
the embodiment of the application provides a processing apparatus of coal industry reuse of reclaimed water dense water, the device includes: a pretreatment unit for pretreating the concentrated water, wherein the pretreatment comprises the step of removing calcium ions and magnesium ions in the concentrated water; the membrane salt separation concentration unit comprises nanofiltration equipment, reverse osmosis equipment and electrodialysis equipment which are sequentially arranged and connected through pipelines, wherein the nanofiltration equipment is connected with the pretreatment unit through pipelines and is used for separating concentrated water input from the pretreatment unit so as to obtain first target concentrated water and target fresh water, and the electrodialysis equipment is used for concentrating salt in the target fresh water so as to obtain second target concentrated water; the sodium sulfate crystallization unit is connected with the nanofiltration equipment through a pipeline, receives first target concentrated water input from the nanofiltration equipment, and obtains sodium sulfate crystals by utilizing the first target concentrated water; and the sodium chloride crystallization unit is connected with the electrodialysis equipment through a pipeline, receives second target concentrated water input from the electrodialysis equipment, and obtains sodium chloride crystals by using the second target concentrated water.
In the embodiment of the application, the reclaimed water recycling concentrated water treatment device comprises a pretreatment unit, a membrane salt separation concentration unit, a sodium sulfate crystallization unit and a sodium chloride crystallization unit; the pretreatment unit removes calcium and magnesium ion impurities in the concentrated water, and the membrane salt separation concentration unit carries out salt separation treatment on the concentrated water; the pretreatment unit is used for removing impurities, so that the concentrated water treatment efficiency can be improved, the service life of the membrane in the membrane salt separation concentration unit can be prolonged, and the operation difficulty and cost can be reduced. Meanwhile, the embodiment of the application adopts nanofiltration to separate salt, and finally obtains sodium chloride products and sodium sulfate products, thereby realizing the recycling of concentrated water and achieving the aim of changing waste into valuables.
In some embodiments, the pretreatment unit comprises a calcium and magnesium ion removal tank, a filtration device and an ion exchange resin unit which are arranged in sequence and connected through a pipeline; the calcium-magnesium ion pool is used for enabling calcium ions and magnesium ions in the concentrated water to react with a precipitator and generate corresponding precipitates so as to remove the calcium ions and the magnesium ions in the concentrated water; said filtration means for filtering said precipitate from said concentrate; the ion exchange resin unit is used for removing residual calcium ions and magnesium ions in the concentrated water.
In some embodiments, the pretreatment unit further comprises a water inlet conditioning tank and an intermediate water tank; the water outlet of the water inlet regulating tank is connected with the water inlet pipeline of the calcium and magnesium ion removal tank; the water inlet of the middle water tank is connected with the water outlet of the ion exchange unit, and the water outlet of the middle water tank is connected with the water inlet pipeline of the nanofiltration device.
In some embodiments, the nanofiltration device comprises a primary nanofiltration unit and a secondary nanofiltration unit connected by a pipeline, wherein the primary nanofiltration unit is connected with the intermediate pond pipeline; the reverse osmosis device comprises a primary reverse osmosis unit and a secondary reverse osmosis unit, wherein the primary reverse osmosis unit is connected with the secondary nanofiltration unit through a pipeline, and the secondary reverse osmosis unit is connected with the electrodialysis device through a pipeline; the secondary nanofiltration unit is used for outputting the first target concentrated water and the target fresh water.
In some embodiments, the filtration apparatus comprises: a precision filter, a cartridge filter and an ultrafiltration unit; the precise filter is used for primarily filtering sediment in the concentrated water; the cartridge filter is used for further filtering sediment in the concentrated water; the ultrafiltration unit is used for deeply filtering sediment in the concentrated water.
In some embodiments, the ultrafiltration unit comprises an ultrafiltration membrane having micropores with a pore size of 0.02 μm to 0.04 μm.
In some embodiments, the ultrafiltration membrane is a polyvinylidene chloride membrane, polysulfone membrane, polyethersulfone membrane, polyacrylonitrile membrane, polyamide membrane, or cellulose acetate membrane.
In some embodiments, the sodium sulfate crystallization unit comprises a sodium sulfate water tank, a sodium sulfate evaporation crystallization device and a freezing crystallization device which are sequentially arranged and connected through pipelines, wherein the sodium sulfate water tank is connected with the nanofiltration equipment through pipelines.
In some embodiments, the sodium chloride crystallization device sequentially comprises a sodium chloride water tank and a sodium chloride evaporation crystallization device which are connected through a pipeline, wherein the sodium chloride water tank is connected with the electrodialysis device through a pipeline.
In some embodiments, the sodium sulfate evaporative crystallization device and the sodium chloride evaporative crystallization device are multi-effect evaporators.
It should be understood that the description in this summary is not intended to limit the critical or essential features of the disclosure, nor is it intended to limit the scope of the disclosure. Other features of the present disclosure will become apparent from the following description.
Drawings
FIG. 1 is a schematic structural view of a treatment device for recycling concentrated water in coal chemical industry provided in some embodiments of the present application;
FIG. 2 is a schematic diagram of a salt-splitting concentrating processing unit provided in some embodiments of the present application;
fig. 3 is a schematic structural view of a treatment device for recycling concentrated water in coal chemical industry according to other embodiments of the present application.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
It should be noted that, if not in conflict, the features of the embodiments of the present utility model may be combined with each other, which are all within the protection scope of the present utility model. In addition, while the division of functional blocks is performed in a device diagram and the logic sequence is shown in a flowchart, in some cases, the steps shown or described may be performed in a different order than the block division in a device diagram or the sequence in a flowchart.
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 utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "comprising" and the like should be understood to be open-ended, i.e., including, but not limited to. The term "based on" should be understood as "based at least in part on". The term "one embodiment" or "the embodiment" should be understood as "at least one embodiment". The terms "first," "second," and the like, may refer to different or the same object and are used solely to distinguish one from another without implying a particular spatial order, temporal order, order of importance, etc. of the referenced objects. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.
The concentrated water for recycling the reclaimed water in the coal chemical industry (hereinafter referred to as concentrated water) mainly refers to wastewater produced by membrane recycling in order to realize water reclamation in coal chemical enterprises, is complex in components, mainly contains cations such as sodium, magnesium, potassium and calcium, and is rich in impurity ion components such as trace amounts of phosphorus, strontium and barium. The waste water of different projects has changeable components, large uncertainty of water quality and high salt content, generally 5000-20000 mg/L, and even 30000mg/L.
Illustratively, fig. 1 shows a treatment device for recycling concentrated water in coal chemical industry according to an embodiment of the present application, and as shown in fig. 1, the device 1000 includes: the pretreatment unit 110, the membrane salt separation concentration unit 120 and the salt separation crystallization unit 130 are sequentially arranged and connected through pipelines. Wherein, the pretreatment unit 110 is used for removing calcium ions and magnesium ions in reclaimed water reuse concentrated water, so that the calcium ions and the magnesium ions generate corresponding sediment and the sediment is removed; the membrane salt concentration unit 120 is used for separating sodium sulfate solution and sodium chloride solution in the concentrated water. The salt separating crystallization unit 130 is used to separate sodium sulfate and sodium chloride in the sodium sulfate solution and the sodium chloride solution, thereby obtaining sodium sulfate crystals and sodium chloride crystals.
Specifically, referring to fig. 2, the pretreatment unit 110 includes a calcium and magnesium ion removal tank 111, a filtration device, and an ion exchange resin unit 115 connected by a pipeline in this order.
In some embodiments, a precipitation agent is added to the calcium and magnesium ion removal cell 111. The precipitant may react with the calcium ions and magnesium ions and form corresponding precipitates, i.e., calcium salt precipitate and magnesium salt precipitate. The precipitant may in particular comprise lime and/or soda water. The concentrate flows into the calcium and magnesium ion removal tank 111 to react with the precipitant, and then is input into the filtering device. The filtering device is used for filtering out sediment in the input reclaimed water and recycling the concentrated water.
Referring to fig. 2, in some embodiments, the filtering apparatus includes a precision filter 112, a cartridge filter 113, and an ultrafiltration unit 114 connected by a pipeline in this order; the precise filter 112 is used for primarily filtering sediment in the concentrated water; the cartridge filter 113 is used for further removing the sediment in the concentrated water to further improve the filtering effect of the calcium-magnesium sediment; the ultrafiltration unit 114 serves to depth-filter the sediment in the medium-concentrated water to ensure the removal effect of the sediment. In some embodiments, to enhance the filtration effect of the ultrafiltration unit 114, the ultrafiltration unit 114 comprises an ultrafiltration membrane having micropores with a pore size of 0.02 μm to 0.04 μm; the ultrafiltration membrane is polyvinylidene chloride membrane, polysulfone membrane, polyethersulfone membrane, polyacrylonitrile membrane, polyamide membrane or cellulose acetate membrane.
After the filtering device filters out the precipitate in the concentrated water, the concentrated water is sent to the ion exchange resin unit 115. If the calcium and magnesium ions in the concentrate are not completely reacted with the precipitant after the concentrate is fed into the calcium and magnesium ion removing tank 111, residual calcium and magnesium ions remain in the concentrate flowing into the ion exchange resin unit 115. In the embodiment of the present application, the ion exchange resin unit 115 is used to deeply remove the calcium ions and magnesium ions remaining in the concentrate water.
In some embodiments, the pretreatment unit 110 further includes a water intake regulating reservoir 100. The water inlet regulating tank 100 is connected with a calcium and magnesium ion removing tank 111 through a pipeline. The upstream concentrated water in the coal chemical industry enters a water inlet regulating tank for homogenization and water distribution, and is conveyed to a calcium and magnesium ion removal tank 111. In other embodiments, the pretreatment unit 110 further comprises an intermediate pond. The middle water tank is connected with the ion exchange resin connecting unit. The concentrated water outputted from the ion exchange resin unit 115 is inputted into the intermediate water tank.
In some embodiments, the filtration device and the ion exchange resin unit 115 are each connected to the influent conditioning tank 100 by a return line. The backwash water of the filtration device and the resin regeneration liquid of the ion exchange resin unit 115 are refluxed to the inflow water adjustment tank through a reflux pipe.
In the embodiment of the application, the service lives of the membrane salt separation concentration unit 120 and the salt separation crystallization unit 130 can be prolonged, the maintenance frequency can be reduced, and the operation cost and the failure rate can be reduced by deeply removing the pollution factors such as calcium ions, magnesium ions and the like and setting the ion exchange resin unit 115 as a guarantee unit for removing the calcium ions and the magnesium ions. For example, in some embodiments, the overhaul period of the conventional membrane split salt concentration unit 120 and split salt crystallization unit 130 may be extended from 3 years to 5 years. The pretreatment unit 110 can specifically reduce subsequent contamination of the membranes, reduce corrosion and fouling blockage of the thermal concentration unit, and reduce maintenance costs and operational risks. Thus, the pre-processing unit 110 will directly determine the subsequent process operation effect and stability.
Specifically, referring to fig. 3, in some embodiments, the membrane split salt concentration unit 120 includes a nanofiltration device, a reverse osmosis device, and an electrodialysis device 125 connected by piping in that order. The salt separation crystallization unit 130 comprises a sodium sulfate crystallization device 131 and a sodium chloride crystallization device 132, wherein the sodium sulfate crystallization device 131 is connected with a nanofiltration device through a pipeline; the sodium chloride crystallization device 132 is in pipeline connection with the electrodialysis device 125. Specifically, the nanofiltration device is used for separating the input concentrated water into a first target concentrated water and a target fresh water, wherein the target concentrated water is input into the sodium sulfate crystallization device 131. The target fresh water obtained by nanofiltration separation is conveyed to reverse osmosis equipment, and is subjected to reverse osmosis desalination and separation to obtain second target concentrated water, and the second target concentrated water enters electrodialysis equipment 125 and sodium chloride crystallization device 132.
In some embodiments, the nanofiltration device specifically comprises a primary nanofiltration unit 121 and a secondary nanofiltration unit 122 connected by a pipeline. Wherein the first-stage nanofiltration unit 121 is connected with the middle water tank pipeline; the secondary nanofiltration unit 122 is respectively connected with a reverse osmosis device and a sodium sulfate crystallization device 131 through pipelines. The secondary nanofiltration unit 122 is used for inputting the generated first target concentrated water to the sodium sulfate crystallization device 131 and inputting the generated target fresh water to the reverse osmosis device. In other embodiments, the reverse osmosis apparatus comprises a first stage reverse osmosis unit 123 and a first stage reverse osmosis unit 124 in line.
The nanofiltration membrane structure of the nanofiltration device is mainly formed by combining a plurality of layers of loose structures, and the structure characteristics enable the nanofiltration membrane to have higher permeability under high salinity and low pressure conditions. Monovalent and divalent salts can be separated from the solution. The nanofiltration membrane can dialyze more than 90% of the nano ions and the chloride ions, and can effectively intercept the components such as bivalent salts and organic matters in the high-concentration brine at the same time, thereby achieving the effect of separating the salts. The water produced at the concentrated water end of the nanofiltration device enters a sodium sulfate crystallization device 131, the water produced at the fresh water end of the nanofiltration device enters a first-stage reverse osmosis unit 123 and a first-stage reverse osmosis unit 124 which are connected in series, and after being treated by a reverse osmosis membrane concentration unit, the water produced at the water outlet of the first-stage reverse osmosis unit 124 enters an Electrodialysis (ED) device 125 for further concentration, and the mass concentration of the concentrated water salt reaches 5% -10%. Electrodialysis device 125 is used to further concentrate the salt, reducing the energy consumption for subsequent evaporation. The concentrate entering the electrodialysis device 125 is driven by the direct current electric field, ions start to migrate continuously from the concentrate chamber to the concentrate chamber, and water is trapped in the concentrate chamber, thereby achieving concentration of salt and simultaneous separation of water. The fresh water end product water of the ED device 125 can be recycled, and the concentrated water end product water of the ED device 125 enters the sodium chloride crystallization device 132.
The ED equipment 125 is added after the reverse osmosis equipment in the reclaimed water recycling concentrated water treatment device in the coal chemical industry, so that the quality of the reclaimed water can be further improved, the water production conductivity after conventional reverse osmosis is about 20S/m, and the water production conductivity after electrodialysis can be below 5S/m. Fresh water generated by electrodialysis can be used as high-standard water replenishing for boilers of enterprises and the like, and the economic value is improved. ED equipment 125 can produce alkali liquor at the anode to recycle the medicament for adjusting the PH by removing calcium and magnesium at the front end, and the concentrated solution further can reduce the energy consumption of the subsequent evaporation unit, thereby achieving the purposes of quality improvement, cost reduction and efficiency improvement.
Specifically, in some embodiments, sodium sulfate crystallization device 131 includes sodium sulfate water tank 1311, sodium sulfate evaporative crystallization device 1312, and freeze crystallization device 1313 connected by piping in that order; wherein sodium sulfate reservoir 1321 is in line with nanofiltration device, e.g., sodium sulfate reservoir 1321 is in line with secondary nanofiltration unit 122. The sodium chloride crystallization device 132 comprises a sodium chloride water tank 1321 and a sodium chloride evaporation crystallization device 1322 which are connected by pipelines in sequence, wherein the sodium chloride water tank 1321 is connected with the electrodialysis device 125 by pipelines.
In some embodiments, to reduce the consumption of heating steam, sodium sulfate evaporative crystallization device 1312 and/or sodium chloride evaporative crystallization device 1322 are multi-effect evaporators.
In the embodiment of the present application, the reclaimed water reuse concentrate treatment apparatus 1000 includes a pretreatment unit 110, a membrane salt concentration unit 120, a sodium sulfate crystallization unit, and a sodium chloride crystallization unit; after the pretreatment unit 110 removes calcium and magnesium ion impurities in the concentrated water, the membrane salt separation concentration unit 120 performs salt separation treatment on the concentrated water; the removal of impurities by the pretreatment unit 110 can improve the concentrated water treatment efficiency, prolong the service life of the membranes in the membrane salt separation concentration unit 120, and reduce the operation difficulty and cost. Meanwhile, the embodiment of the application adopts nanofiltration to separate salt, ensures the purity of the product salt through a plurality of working procedures, and finally obtains sodium chloride products and sodium sulfate products, thereby realizing the recycling of concentrated water and achieving the aim of changing waste into valuables. The device for treating the reclaimed water recycling concentrated water in the coal chemical industry realizes high purity of finished salt, is not influenced by the quality of the reclaimed water recycling concentrated water, and has the advantages of stable operation, low operation cost, long service life of a membrane and the like.
It should be noted that while the present utility model has been illustrated in the drawings and described in the specification of the preferred embodiment, it is to be understood that the present utility model may be embodied in many different forms and should not be construed as limited to the embodiments set forth in the specification, but are provided as additional limitations on the scope of the utility model so as to provide a more thorough understanding of the present utility model. The above-described features are further combined with each other to form various embodiments not listed above, and are considered to be the scope of the present utility model described in the specification; further, modifications and variations of the present utility model may be apparent to those skilled in the art in light of the foregoing teachings, and all such modifications and variations are intended to be included within the scope of this utility model as defined in the appended claims.
Claims (10)
1. A treatment device for recycling concentrated water in coal chemical industry, which is characterized by comprising:
a pretreatment unit for pretreating the concentrated water, wherein the pretreatment comprises the step of removing calcium ions and magnesium ions in the concentrated water;
the membrane salt separation concentration unit comprises nanofiltration equipment, reverse osmosis equipment and electrodialysis equipment which are sequentially arranged and connected through pipelines, wherein the nanofiltration equipment is connected with the pretreatment unit through pipelines and is used for separating concentrated water input from the pretreatment unit so as to obtain first target concentrated water and target fresh water, and the electrodialysis equipment is used for concentrating salt in the target fresh water so as to obtain second target concentrated water;
the sodium sulfate crystallization unit is connected with the nanofiltration equipment through a pipeline, receives first target concentrated water input from the nanofiltration equipment, and obtains sodium sulfate crystals by utilizing the first target concentrated water;
and the sodium chloride crystallization unit is connected with the electrodialysis equipment through a pipeline, receives second target concentrated water input from the electrodialysis equipment, and obtains sodium chloride crystals by using the second target concentrated water.
2. The apparatus according to claim 1, wherein the pretreatment unit comprises a decalcification ion tank, a filtration device and an ion exchange resin unit which are sequentially arranged and connected through a pipeline; wherein,
the calcium-magnesium ion pool is used for enabling calcium ions and magnesium ions in the concentrated water to react with a precipitator and generate corresponding precipitates so as to remove the calcium ions and the magnesium ions in the concentrated water;
said filtration means for filtering said precipitate from said concentrate;
the ion exchange resin unit is used for removing residual calcium ions and magnesium ions in the concentrated water.
3. The apparatus of claim 2, wherein the pretreatment unit further comprises a feed water conditioning tank and an intermediate water tank;
the water outlet of the water inlet regulating tank is connected with the water inlet pipeline of the calcium and magnesium ion removal tank;
the water inlet of the middle water tank is connected with the water outlet of the ion exchange unit, and the water outlet of the middle water tank is connected with the water inlet pipeline of the nanofiltration device.
4. The apparatus of claim 3, wherein the nanofiltration device comprises a primary nanofiltration unit and a secondary nanofiltration unit connected by a pipeline, wherein the primary nanofiltration unit is connected with the intermediate pond pipeline;
the reverse osmosis device comprises a primary reverse osmosis unit and a secondary reverse osmosis unit, wherein the primary reverse osmosis unit is connected with the secondary nanofiltration unit through a pipeline, and the secondary reverse osmosis unit is connected with the electrodialysis device through a pipeline;
the secondary nanofiltration unit is used for outputting the first target concentrated water and the target fresh water.
5. The apparatus of any one of claims 2-4, wherein the filtering device comprises: a precision filter, a cartridge filter and an ultrafiltration unit; wherein,
the precise filter is used for carrying out preliminary filtration on sediment in the concentrated water;
the cartridge filter is used for further filtering sediment in the concentrated water;
the ultrafiltration unit is used for deeply filtering sediment in the concentrated water.
6. The apparatus of claim 5, wherein the ultrafiltration unit comprises an ultrafiltration membrane having micropores with a pore size of 0.02 μm to 0.04 μm.
7. The device of claim 6, wherein the ultrafiltration membrane is a polyvinylidene chloride membrane, a polysulfone membrane, a polyethersulfone membrane, a polyacrylonitrile membrane, a polyamide membrane, or a cellulose acetate membrane.
8. The device according to claim 6 or 7, wherein the sodium sulfate crystallization unit comprises a sodium sulfate water tank, a sodium sulfate evaporation crystallization device and a freezing crystallization device which are sequentially arranged and connected through pipelines, wherein the sodium sulfate water tank is connected with the nanofiltration equipment through pipelines.
9. The device according to claim 8, wherein the sodium chloride crystallizing device comprises a sodium chloride water tank and a sodium chloride evaporating crystallizing device which are connected through a pipeline in sequence, wherein the sodium chloride water tank is connected with an electrodialysis device through a pipeline.
10. The apparatus of claim 9, wherein the sodium sulfate evaporative crystallization apparatus and the sodium chloride evaporative crystallization apparatus are multi-effect evaporators.
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