CN110550791A - Desulfurization waste water resourceful zero discharge system - Google Patents
Desulfurization waste water resourceful zero discharge system Download PDFInfo
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- CN110550791A CN110550791A CN201810536995.1A CN201810536995A CN110550791A CN 110550791 A CN110550791 A CN 110550791A CN 201810536995 A CN201810536995 A CN 201810536995A CN 110550791 A CN110550791 A CN 110550791A
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 28
- 230000023556 desulfurization Effects 0.000 title claims abstract description 28
- 239000002351 wastewater Substances 0.000 title claims abstract description 23
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 28
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims abstract description 27
- 235000019341 magnesium sulphate Nutrition 0.000 claims abstract description 27
- 239000012528 membrane Substances 0.000 claims abstract description 25
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 21
- 238000005189 flocculation Methods 0.000 claims abstract description 18
- 230000016615 flocculation Effects 0.000 claims abstract description 18
- 238000002425 crystallisation Methods 0.000 claims abstract description 15
- 230000008025 crystallization Effects 0.000 claims abstract description 15
- 239000011780 sodium chloride Substances 0.000 claims abstract description 14
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 14
- 239000010802 sludge Substances 0.000 claims abstract description 13
- 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 claims abstract description 12
- 239000011734 sodium Substances 0.000 claims abstract description 12
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 12
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000005352 clarification Methods 0.000 claims abstract description 11
- 239000000701 coagulant Substances 0.000 claims abstract description 10
- 239000003463 adsorbent Substances 0.000 claims abstract description 9
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 9
- 238000001704 evaporation Methods 0.000 claims abstract description 8
- 230000008020 evaporation Effects 0.000 claims abstract description 8
- 239000011777 magnesium Substances 0.000 claims abstract description 8
- 238000004806 packaging method and process Methods 0.000 claims abstract description 8
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 7
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 7
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 7
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 7
- 238000000746 purification Methods 0.000 claims abstract description 7
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 7
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 7
- 239000011575 calcium Substances 0.000 claims abstract description 5
- 230000008014 freezing Effects 0.000 claims abstract description 4
- 238000007710 freezing Methods 0.000 claims abstract description 4
- 230000001105 regulatory effect Effects 0.000 claims abstract 2
- 238000004064 recycling Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 239000012452 mother liquor Substances 0.000 claims description 8
- 239000002033 PVDF binder Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 230000002457 bidirectional effect Effects 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 230000007774 longterm Effects 0.000 claims description 2
- WRUGWIBCXHJTDG-UHFFFAOYSA-L magnesium sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Mg+2].[O-]S([O-])(=O)=O WRUGWIBCXHJTDG-UHFFFAOYSA-L 0.000 claims description 2
- 229940061634 magnesium sulfate heptahydrate Drugs 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 239000002562 thickening agent Substances 0.000 claims description 2
- 239000012065 filter cake Substances 0.000 claims 5
- 239000007787 solid Substances 0.000 claims 3
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 claims 2
- 230000003014 reinforcing effect Effects 0.000 claims 2
- 239000004155 Chlorine dioxide Substances 0.000 claims 1
- 239000005708 Sodium hypochlorite Substances 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 claims 1
- 235000019398 chlorine dioxide Nutrition 0.000 claims 1
- 230000002349 favourable effect Effects 0.000 claims 1
- 239000008394 flocculating agent Substances 0.000 claims 1
- 230000005484 gravity Effects 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 239000002245 particle Substances 0.000 claims 1
- 238000001556 precipitation Methods 0.000 claims 1
- 238000005201 scrubbing Methods 0.000 claims 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims 1
- 239000006228 supernatant Substances 0.000 claims 1
- 239000006227 byproduct Substances 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 description 4
- 238000009297 electrocoagulation Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000010842 industrial wastewater Substances 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 125000001741 organic sulfur group Chemical group 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002455 scale inhibitor Substances 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229920011532 unplasticized polyvinyl chloride Polymers 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/40—Magnesium sulfates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/10—Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
- C02F1/12—Spray evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
- C02F1/385—Treatment of water, waste water, or sewage by centrifugal separation by centrifuging suspensions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/425—Treatment of water, waste water, or sewage by ion-exchange using cation exchangers
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Geology (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
the invention discloses a desulfurization wastewater resource zero-discharge system which mainly comprises a desulfurization treatment device, a high-pressure centrifugal cyclone, a raw water regulating tank, an electric flocculation device, a high-efficiency clarification softener, a membrane filter, a high-pressure ozone device, a high-pressure ultraviolet device, a single-head packaging hollow ultrafiltration, a security filter, an NF device, a magnesium sulfate concentration device, a magnesium sulfate crystallizer, a freezing separator, a purification device, a sodium bed, a primary RO device, a HIRO device, an electrolysis device, a sodium chloride crystallizer, a flue evaporation crystallization device, a secondary RO device, a high-efficiency adsorbent dosing device, a sodium hydroxide dosing device, a calcium hydroxide dosing device, a sodium sulfate dosing device, a coagulant aid dosing device, a PH meter, a Ca online monitor, a Mg online monitor, an online COD instrument and a sludge dewatering device. The system can reduce the dosage, simultaneously reduce the sludge amount of produced water, generate industrial-grade magnesium sulfate and sodium chloride byproducts, and solve the problems encountered in the prior thermal power plant.
Description
Technical Field
The invention relates to the technical field of desulfurization wastewater treatment and environmental protection of thermal power plants, and particularly relates to a desulfurization wastewater recycling zero-emission system.
Background
At present, the economy of China is developed at a high speed, and simultaneously, the environmental problem is increasingly serious along with the huge consumption of energy. In order to improve the current environmental situation, the national management of three wastes is getting tighter and tighter, the industrial wastewater zero discharge is accepted by a plurality of enterprises and professional personnel, and the implementation in the industrial field is gradually started. The water is used as an indispensable resource in the industrial field, and the discharge of concentrated brine is used as an important environmental protection index. The zero discharge implemented in the industrial wastewater field of China, especially in a thermal power plant, has the key problems of high operation cost and investment cost of desulfurization wastewater and lack of stable operation experience, and how to find a more stable treatment method and a technology with lower operation cost by experiments is being explored.
Under the normal operation condition of the desulfurization system, in order to keep stable operation and continuously discharge desulfurization wastewater, Mg in some desulfurization wastewater reaches more than 2000Mg, and in the softening process, Mg is required to be settled to generate Mg (OH) 2 by the traditional method, so that a large amount of OH radicals are added, a large amount of sludge is generated, and the operation and maintenance cost of the system is increased.
Therefore, it is necessary to develop a system capable of reducing the dosage of the desulfurization wastewater and the sludge discharge, and recycling the obtained by-products.
disclosure of Invention
The invention overcomes the defects of the prior art and provides a desulfurization wastewater recycling zero-discharge system.
in view of the above problems in the prior art, according to one aspect of the present invention, to solve the above technical problems, the present invention employs a desulfurization wastewater recycling zero-emission system, which mainly comprises a desulfurization treatment device, a high-pressure centrifugal cyclone, a raw water conditioning tank, an electrocoagulation device, a high-efficiency clarification softener, a membrane filter, a high-pressure ozone device, a high-pressure ultraviolet device, a single-head packaged hollow ultrafiltration, a cartridge filter, an NF device, a magnesium sulfate concentration device, a magnesium sulfate crystallizer, a freeze separator, a purification device, a sodium bed, a primary RO device, a HIRO device, an electrolysis device, a sodium chloride crystallizer, a flue evaporative crystallization device, a secondary RO device, a high-efficiency adsorbent dosing device, a sodium hydroxide dosing device, a calcium hydroxide dosing device, a sodium sulfate dosing device, a coagulant dosing device, a PH meter, a Ca on-line monitor, a, Mg on-line monitor, on-line COD instrument, sludge dewatering device.
Compared with the prior art, the invention has the advantages that:
(1) Adding high-efficiency composite inorganic adsorbent to obtain original organic sulfur, flocculant and coagulant aid, and reducing dosage;
(2) The high-pressure ozone device and the high-pressure ultraviolet device are arranged, so that COD is effectively reduced;
(3) Mg ions finally form magnesium sulfate heptahydrate, so that the dosage of precipitated magnesium ions is reduced, and simultaneously, sludge is also reduced;
(4) The sodium bed regenerates and utilizes the concentrated water of the HIRO device, thereby saving the medicament and saving part of the investment of the wastewater and the operation treatment cost;
(5) Concentrated water generated by the HIRO device enters an electrolysis device and a sodium chloride crystallizer, and a byproduct generated by the electrolysis device is comprehensively utilized;
(6) Mother liquor of the evaporative crystallizer is discharged into a flue evaporative crystallization device, so that real zero emission is realized.
Drawings
For a clear explanation of the embodiments or prior art technical solutions of the present application, the drawings needed to be used in the description of the embodiments or prior art will be briefly described below, it is obvious that the drawings in the following description are only references to some embodiments in the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts, and some parts of them can be used after adjustment.
Fig. 1 shows a schematic structural diagram of a desulfurization wastewater recycling zero-emission system according to an embodiment of the invention. In the figure, (101) desulfurization treatment apparatus, (102) high-pressure centrifugal cyclone, (103) electrocoagulation apparatus, (104) high-efficiency clarification softener, (105) membrane filter, (106) high-pressure ozone apparatus, (107) high-pressure ultraviolet apparatus, (108) single-head packed hollow ultrafiltration, (109) cartridge filter, (110) NF apparatus, (111) magnesium sulfate concentration apparatus, (112) magnesium sulfate crystallizer, (113) freeze separator, (114) purification apparatus, (115) sodium bed, (116) primary RO apparatus, (117) HIRO apparatus, (118) electrolysis apparatus, (119) sodium chloride crystallizer, (120) flue evaporative crystallization apparatus, (121) secondary RO apparatus, (122) coagulant addition apparatus, (123) sodium hydroxide addition apparatus, (124) calcium hydroxide addition apparatus, (125) high-efficiency adsorbent addition apparatus, (126) sodium sulfate addition apparatus, (127) A sludge dewatering device.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
FIG. 1 shows a desulfurization wastewater recycling zero-emission system according to an embodiment of the present invention, which comprises (101) a desulfurization treatment device, (102) a high-pressure centrifugal cyclone, (103) an electrocoagulation device, (104) a high-efficiency clarification softener, (105) a membrane filter, (106) a high-pressure ozone device, (107) a high-pressure ultraviolet device, (108) a single-head packaged hollow ultrafiltration, (109) a security filter, (110) an NF device, (111) a magnesium sulfate concentration device, (112) a magnesium sulfate crystallizer, (113) a freeze separator, (114) a purification device, (115) a sodium bed, (116) a primary RO device, (117) a HIRO device, (118) an electrolysis device, (119) a sodium chloride crystallizer, (120) a flue evaporative crystallization device, (121) a secondary RO device, (122) a coagulant adding device, (123) a sodium hydroxide adding device, (124) a calcium hydroxide adding device, (125) A high-efficiency adsorbent dosing device, (126) a sodium sulfate dosing device, and (127) a sludge dewatering device.
In order to realize the recycling of the desulfurization waste water, the system is realized by five steps and is connected with each device in the system through a pipeline and a pump.
(1) (101) wastewater produced by the desulfurization treatment device enters a (102) high-pressure centrifugal cyclone from the bottom through a high-pressure pump, a coagulant aid dosing port is arranged in front of the (102) high-pressure centrifugal cyclone and is connected with a (122) coagulant aid dosing device, then the wastewater is distributed by a cyclone in a central cylinder, a clear water port is arranged at the upper part of the central cylinder and is connected with a raw water adjusting tank through a pipeline, and a waste liquid port is arranged at the bottom of the central cylinder and is connected with a vacuum belt conveyor in the (101) desulfurization treatment device through a pipeline and enters the tail end of the vacuum belt conveyor;
(2) The raw water adjusting tank is connected with a (103) electric flocculation device through a pipeline by a water pump, (103) the electric flocculation device is provided with a direct current power supply, (103) the electric flocculation device is connected with a (104) high-efficiency clarification softener through a pipeline, (104) the high-efficiency clarification softener consists of two front mixing tanks, a flocculation tank and a high-efficiency clarifier, the front mixing tank enters the front pipeline and is provided with a pipeline mixer, the pipeline mixer is connected with a (123) sodium hydroxide dosing device and a (124) calcium hydroxide dosing device, a PH meter is arranged after treatment, a second front mixing tank is connected with a (126) sodium sulfate dosing device and a (125) high-efficiency adsorbent dosing device, the effluent is provided with a Ca online monitor and a Mg online monitor, a quick stirrer is arranged in the front mixing tank, a lifting stirrer is arranged in the flocculation tank, a guide cylinder is arranged in the middle part, the flocculation tank is connected with the (125) high-efficiency, the effluent of the flocculation tank enters a high-efficiency clarifier, a water inlet pipe tangentially enters a flow guide pipe of the high-efficiency clarifier at the top, variable-interval and variable-angle blade type rotational flow cloth is arranged in the flow guide pipe, two layers of inclined pipe devices are arranged in the high-efficiency clarifier, a conical hopper is arranged at the bottom of the high-efficiency clarifier, and the high-efficiency clarifier is connected with a sludge dewatering device (127) through a sludge pump;
(3) (105) the membrane filter consists of an automatic control system, a flexible valve group, a membrane filtering component and a tank body pipe. The membrane filter passes through a high-pressure ozone device (106) and a high-pressure ultraviolet device (107) through a pipeline, and then is connected with a single-head packaging hollow ultrafiltration (108) through a pump, the single-head packaging hollow ultrafiltration (108) mainly adopts reinforced rib type PVDF membrane wires, and one end of each membrane wire is in packaging design;
(4) (108) single-head packaged hollow ultrafiltration is connected with a (109) security filter and a (110) NF device through a pipeline and a pump, (110) the NF device is of a first-stage two-section, a concentrated water port of the NF device is connected with a (111) magnesium sulfate concentration device, (111) a water port of a magnesium sulfate concentration device is connected with a (121) second-stage RO device, (111) a concentrated water port of the magnesium sulfate concentration device is connected with a (112) magnesium sulfate crystallizer, (112) the magnesium sulfate crystallizer consists of an OSLO crystallizer, (113) a freezing separator, a circulating pump, a thickener, a mother liquor tank and a process pump, finally formed magnesium sulfate is purified through a (114) purification device, and (112) the mother liquor tank of the magnesium sulfate crystallizer is connected with a (120) flue evaporation crystallization device;
(5) (120) two kinds of flue evaporation crystallization devices are adopted, one is flue direct injection, and the other is a bypass flue; the discharged mother liquor of the magnesium sulfate crystallizer (112) and the discharged mother liquor of the sodium chloride crystallizer (119) enter a flue evaporation crystallization device (120), and a gas-liquid bidirectional flow nozzle is adopted to perform circumferential tangential gas inlet;
(6) an online COD (chemical oxygen demand) instrument is arranged in front of the NF (110), the produced water of the NF is connected with a sodium (115) bed, (115) the produced water of the sodium bed is connected with a primary RO (116) device, (116) the concentrated water of the primary RO device is connected with a HIRO (117) device, (116) the water producing port of the primary RO device and the water producing port of the HIRO device are connected with a secondary RO (121), (121) the concentrated water of the secondary RO device is connected with the primary RO (116), the concentrated water of the HIRO device is connected with an electrolysis device (118), a sodium chloride crystallizer (119) and the sodium (115) bed, the mother liquor of the sodium chloride crystallizer is discharged to a flue evaporative crystallization device (120), the temperature of the flue evaporative crystallization device (120) is 350 ℃, and the pressure is 500 KPA;
(7) Adding the scale inhibitor in front of (110) an NF device, (116) a first-stage RO device and (117) a HIRO device, wherein the pressure of the first-stage RO device (116) is PN4.0Mpa ~ PN6.4Mpa, a high-pressure anti-pollution membrane is adopted, the pressure of a flow channel is 45mil, the pressure of the HIRO device (117) is PN16Mpa, a roll-type high-pressure wide-flow-channel anti-pollution membrane is adopted, the flow channel is 50mil, and the material is PVDF;
(8) The devices are connected with a pump through a pipeline, the pipeline is UPVC, and the water pump is made of anti-corrosion materials.
in order to ensure the long-term stable operation of the process system, realize complete zero emission and utilize products, the system also comprises a cleaning device, a dosing device, an electrical system and an instrument which are matched with each other, and the operation of the desulfurization wastewater recycling zero emission system is controlled.
reference throughout this specification to "one embodiment," "an embodiment," and so forth, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally throughout this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the invention to effect such feature, structure, or characteristic in connection with other embodiments.
although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.
Claims (5)
1. a zero discharge system for recycling desulfurization waste water mainly comprises a desulfurization treatment device, a high-pressure centrifugal cyclone, a raw water adjusting tank, an electric flocculation device, a high-efficiency clarification softener, a membrane filter, a high-pressure ozone device, a high-pressure ultraviolet device, single-head packaging hollow ultrafiltration, a security filter, an NF device, a magnesium sulfate concentration device, a magnesium sulfate crystallizer, a freezing separator, a purification device, a sodium bed, a primary RO device, a HIRO device, an electrolysis device, a sodium chloride crystallizer, a flue evaporative crystallization device, a secondary RO device, a high-efficiency adsorbent dosing device, a sodium hydroxide dosing device, a calcium hydroxide dosing device, a sodium sulfate dosing device, a coagulant aid dosing device, a PH meter, a Ca online monitor, an Mg online monitor, an online COD (chemical oxygen demand) instrument and a sludge dewatering device.
2. In order to ensure the long-term stable operation of the process system, the process system also comprises a related cleaning device, an electric system and instrument control, and is characterized in that:
Waste water produced by the desulfurization treatment device enters a high-pressure centrifugal cyclone from the bottom through a high-pressure pump, a coagulant aid dosing port is arranged in front of the high-pressure centrifugal cyclone and then distributed by a cyclone in a central cylinder, a clear water port is arranged at the upper part of the high-pressure centrifugal cyclone and connected with a raw water regulating pool through a pipeline, a waste liquid port is arranged at the bottom of the high-pressure centrifugal cyclone and connected with a vacuum belt conveyor in the desulfurization treatment device through a pipeline, and the waste water enters the tail end of the vacuum;
The raw water adjusting tank is connected with an electric flocculation device through a pipeline by a water pump, the electric flocculation device is provided with a direct-current power supply, the electric flocculation device is connected with a high-efficiency clarification softener through a pipeline, the high-efficiency clarification softener consists of two front mixing tanks, a flocculation tank and a high-efficiency clarifier, the front mixing tank is provided with a pipeline mixer before entering the front pipeline, the pipeline mixer is connected with a sodium hydroxide dosing device and a calcium hydroxide dosing device, a PH meter is arranged after treatment, the second front mixing tank is connected with a sodium sulfate dosing device and a high-efficiency adsorbent dosing device, the effluent is provided with a Ca online monitor and a Mg online monitor, a rapid mixer is arranged in the front mixing tank, a lifting mixer is arranged in the flocculation tank, the middle part of the front mixing tank is provided with a guide cylinder, the flocculation tank is connected with the high-efficiency adsorbent dosing device, the effluent of the flocculation tank enters the high, the variable-interval and variable-angle blade type rotational flow cloth is arranged in the flow guide pipe, two layers of inclined pipe devices are arranged in the high-efficiency clarifier, and the bottom of the high-efficiency clarifier is provided with a cone hopper and is connected with a sludge dewatering device through a sludge pump;
the membrane filter consists of an automatic control system, a flexible valve group, a membrane filtering component and a tank body pipe.
3. after passing through a high-pressure ultraviolet device by a high-pressure ozone device through a pipeline, a film filter is subjected to hollow ultrafiltration by a pump and single-head packaging, wherein the single-head packaging hollow ultrafiltration mainly adopts a PVDF film yarn with a reinforcing rib type, and one end of the film yarn is designed in a packaging way;
the single-head packaged hollow ultrafiltration is connected with a security filter and an NF device through a pipeline and a pump, the NF device is a first-stage two-section device, a concentrated water gap of the NF device is connected with a magnesium sulfate concentration device, a water gap of the magnesium sulfate concentration device is connected with a second-stage RO device, a concentrated water gap of the magnesium sulfate concentration device is connected with a magnesium sulfate crystallizer, the magnesium sulfate crystallizer consists of an OSLO crystallizer, a freezing separator, a circulating pump, a thickener, a mother liquid tank and a process pump, the finally formed magnesium sulfate is purified through a purification device, and the mother liquid tank of the magnesium sulfate crystallizer is connected with a flue evaporation crystallization device;
the flue evaporation crystallization device comprises two types, one type is flue direct injection, and the other type is a bypass flue; the discharged mother liquor of the magnesium sulfate crystallizer and the sodium chloride crystallizer enter a flue evaporation crystallization device, and a gas-liquid bidirectional flow nozzle is adopted for circumferential tangential air intake;
An online COD instrument is arranged in front of the NF device, the produced water of the NF device is connected with a sodium bed, the produced water of the sodium bed is connected with a primary RO device, the concentrated water of the primary RO device is connected with an HIRO device, the primary RO device and the HIRO device are connected with a secondary RO device, the concentrated water of the secondary RO device is connected with the primary RO device, the concentrated water of the HIRO device is connected with an electrolysis device, a sodium chloride crystallizer and a sodium bed, and the mother liquor of the sodium chloride crystallizer is discharged to a flue evaporation crystallization device;
the supernatant of the wastewater rotates from the upper part to flow out and solid particles flow out from the bottom part due to the difference of specific gravity and centrifugal force of the high-pressure centrifugal cyclone, and coagulant aid is added in front of the high-pressure cyclone;
the electric flocculation device generates a flocculating agent from the positive and negative electrode plates through a direct current power supply and grows with the wastewater water;
Mix more than pond agitator rotational speed 200rpm before high-efficient clarification softener, the inlet tube advances the honeycomb duct of the high-efficient clarifier in the high-efficient clarification softener at top tangent line, it is rotatory in the honeycomb duct, be equipped with the variable spacing in the honeycomb duct, variable angle blade type whirl cloth, fully flocculation and precipitation reaction carries out, at last separate in high-efficient clarifier awl fill department, water begins to go up, for the increase velocity of flow, be equipped with two-layer pipe chute device in, two-layer pipe chute device reverse arrangement, the bottom is carried out the mud for awl fill department, the bottom is equipped with the mud level meter, the mud is arranged to the accessible mud level meter, simultaneously mud adopts 6% backward flow to mix the pond before to.
4. when the membrane filter filters, the desulfurization liquid passes through the membrane filter element, clear liquid penetrates through the membrane filter element and enters the upper cavity, solid in the liquid is completely intercepted on the surface of the membrane filter element to form a filter cake, because the membrane has excellent non-adhesiveness and a very small friction coefficient, and an automatic execution system is added, instantaneous reverse flow in seconds forms reverse cleaning, the filter cake is completely removed from the surface of the membrane filter element, the filter cake separated from the surface of the membrane filter element is deposited at the bottom of the filter, and when a certain amount of the filter cake is reached, the filter cake is quickly discharged from the bottom.
5. The single-end packaged hollow ultrafiltration material is a PVDF membrane wire with a reinforcing rib, the membrane wire is allowed to swing freely in the membrane shell, and the open structure of the single-end packaged hollow ultrafiltration material is favorable for scrubbing air into each membrane wire and fully releasing trapped solids;
after the single-head packaged hollow ultrafiltration effluent is sterilized by a high-pressure ozone device and a high-pressure ultraviolet device, the pressure of the high-pressure ozone device is more than PN1.6Mpa, a lamp tube in the high-pressure ultraviolet device is more than 100000 Pa, and the COD of the high-pressure ozone device is controlled within 50 ppm;
The desulfurization wastewater recycling zero-discharge system and the method can simultaneously produce magnesium sulfate heptahydrate, sodium chloride, sodium hypochlorite and chlorine dioxide.
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