CN113860557B - Tetrabromobisphenol A comprehensive wastewater photocatalysis treatment process - Google Patents
Tetrabromobisphenol A comprehensive wastewater photocatalysis treatment process Download PDFInfo
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- CN113860557B CN113860557B CN202111208963.7A CN202111208963A CN113860557B CN 113860557 B CN113860557 B CN 113860557B CN 202111208963 A CN202111208963 A CN 202111208963A CN 113860557 B CN113860557 B CN 113860557B
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- tetrabromobisphenol
- hydrogen peroxide
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- wastewater
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- 239000002351 wastewater Substances 0.000 title claims abstract description 46
- VEORPZCZECFIRK-UHFFFAOYSA-N 3,3',5,5'-tetrabromobisphenol A Chemical compound C=1C(Br)=C(O)C(Br)=CC=1C(C)(C)C1=CC(Br)=C(O)C(Br)=C1 VEORPZCZECFIRK-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000001699 photocatalysis Effects 0.000 title claims abstract description 26
- 238000007146 photocatalysis Methods 0.000 title description 15
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 44
- DIKBFYAXUHHXCS-UHFFFAOYSA-N bromoform Chemical compound BrC(Br)Br DIKBFYAXUHHXCS-UHFFFAOYSA-N 0.000 claims abstract description 44
- BSWWXRFVMJHFBN-UHFFFAOYSA-N 2,4,6-tribromophenol Chemical compound OC1=C(Br)C=C(Br)C=C1Br BSWWXRFVMJHFBN-UHFFFAOYSA-N 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229950005228 bromoform Drugs 0.000 claims abstract description 22
- 150000002894 organic compounds Chemical class 0.000 claims abstract description 15
- 238000003916 acid precipitation Methods 0.000 claims abstract description 8
- 239000007864 aqueous solution Substances 0.000 claims abstract description 4
- 239000007800 oxidant agent Substances 0.000 claims abstract description 4
- 230000001590 oxidative effect Effects 0.000 claims abstract description 4
- 239000000243 solution Substances 0.000 claims description 39
- 239000006228 supernatant Substances 0.000 claims description 18
- FAXWFCTVSHEODL-UHFFFAOYSA-N 2,4-dibromophenol Chemical compound OC1=CC=C(Br)C=C1Br FAXWFCTVSHEODL-UHFFFAOYSA-N 0.000 claims description 10
- SSIZLKDLDKIHEV-UHFFFAOYSA-N 2,6-dibromophenol Chemical compound OC1=C(Br)C=CC=C1Br SSIZLKDLDKIHEV-UHFFFAOYSA-N 0.000 claims description 10
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 9
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 claims description 9
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052794 bromium Inorganic materials 0.000 claims description 8
- -1 2,4, 6-tribromophenol organic compounds Chemical class 0.000 claims 1
- FNAKEOXYWBWIRT-UHFFFAOYSA-N 2,3-dibromophenol Chemical compound OC1=CC=CC(Br)=C1Br FNAKEOXYWBWIRT-UHFFFAOYSA-N 0.000 abstract description 4
- 238000004065 wastewater treatment Methods 0.000 abstract description 4
- 238000004064 recycling Methods 0.000 abstract description 3
- MVPPADPHJFYWMZ-UHFFFAOYSA-N chlorobenzene Chemical compound ClC1=CC=CC=C1 MVPPADPHJFYWMZ-UHFFFAOYSA-N 0.000 description 18
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 18
- 238000013032 photocatalytic reaction Methods 0.000 description 18
- 239000000126 substance Substances 0.000 description 18
- 238000004458 analytical method Methods 0.000 description 17
- 238000006243 chemical reaction Methods 0.000 description 14
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 10
- 238000010586 diagram Methods 0.000 description 10
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 9
- 230000020477 pH reduction Effects 0.000 description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000012071 phase Substances 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 7
- QQZOPKMRPOGIEB-UHFFFAOYSA-N 2-Oxohexane Chemical compound CCCCC(C)=O QQZOPKMRPOGIEB-UHFFFAOYSA-N 0.000 description 6
- 238000000605 extraction Methods 0.000 description 6
- 238000002290 gas chromatography-mass spectrometry Methods 0.000 description 6
- ZOCHHNOQQHDWHG-UHFFFAOYSA-N hexan-3-ol Chemical compound CCCC(O)CC ZOCHHNOQQHDWHG-UHFFFAOYSA-N 0.000 description 6
- 238000001819 mass spectrum Methods 0.000 description 6
- 208000033962 Fontaine progeroid syndrome Diseases 0.000 description 5
- 239000002253 acid Substances 0.000 description 5
- 238000005273 aeration Methods 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 239000013067 intermediate product Substances 0.000 description 5
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 5
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 4
- 150000001335 aliphatic alkanes Chemical class 0.000 description 4
- 239000006227 byproduct Substances 0.000 description 4
- 239000003063 flame retardant Substances 0.000 description 4
- 150000002576 ketones Chemical class 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000012074 organic phase Substances 0.000 description 4
- 230000035484 reaction time Effects 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 239000013049 sediment Substances 0.000 description 4
- 239000011550 stock solution Substances 0.000 description 4
- ULPMRIXXHGUZFA-UHFFFAOYSA-N (R)-4-Methyl-3-hexanone Natural products CCC(C)C(=O)CC ULPMRIXXHGUZFA-UHFFFAOYSA-N 0.000 description 3
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 3
- PFCHFHIRKBAQGU-UHFFFAOYSA-N 3-hexanone Chemical compound CCCC(=O)CC PFCHFHIRKBAQGU-UHFFFAOYSA-N 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000005893 bromination reaction Methods 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 229960001566 methyltestosterone Drugs 0.000 description 3
- 238000013033 photocatalytic degradation reaction Methods 0.000 description 3
- 150000003254 radicals Chemical class 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- OXMIDRBAFOEOQT-UHFFFAOYSA-N 2,5-dimethyloxolane Chemical compound CC1CCC(C)O1 OXMIDRBAFOEOQT-UHFFFAOYSA-N 0.000 description 2
- SXRHGLQCOLNZPT-UHFFFAOYSA-N 3,5-dibromo-4-hydroxybenzaldehyde Chemical compound OC1=C(Br)C=C(C=O)C=C1Br SXRHGLQCOLNZPT-UHFFFAOYSA-N 0.000 description 2
- PHWAJJWKNLWZGJ-UHFFFAOYSA-N 3,5-dibromo-4-hydroxybenzoic acid Chemical compound OC(=O)C1=CC(Br)=C(O)C(Br)=C1 PHWAJJWKNLWZGJ-UHFFFAOYSA-N 0.000 description 2
- CPELXLSAUQHCOX-UHFFFAOYSA-N Hydrogen bromide Chemical compound Br CPELXLSAUQHCOX-UHFFFAOYSA-N 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 2
- 239000008346 aqueous phase Substances 0.000 description 2
- 238000010835 comparative analysis Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- JHJLBTNAGRQEKS-UHFFFAOYSA-M sodium bromide Chemical compound [Na+].[Br-] JHJLBTNAGRQEKS-UHFFFAOYSA-M 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- HWWKEEKUMAZJLL-UHFFFAOYSA-N 4-bromo-2,5-dichlorophenol Chemical compound OC1=CC(Cl)=C(Br)C=C1Cl HWWKEEKUMAZJLL-UHFFFAOYSA-N 0.000 description 1
- GZFGOTFRPZRKDS-UHFFFAOYSA-N 4-bromophenol Chemical compound OC1=CC=C(Br)C=C1 GZFGOTFRPZRKDS-UHFFFAOYSA-N 0.000 description 1
- PXSGFTWBZNPNIC-UHFFFAOYSA-N 618-80-4 Chemical compound OC1=C(Cl)C=C([N+]([O-])=O)C=C1Cl PXSGFTWBZNPNIC-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000031709 bromination Effects 0.000 description 1
- FMWLUWPQPKEARP-UHFFFAOYSA-N bromodichloromethane Chemical compound ClC(Cl)Br FMWLUWPQPKEARP-UHFFFAOYSA-N 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004587 chromatography analysis Methods 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 229910000042 hydrogen bromide Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 239000000825 pharmaceutical preparation Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 238000006552 photochemical reaction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- 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
- C02F1/26—Treatment of water, waste water, or sewage by extraction
-
- 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
- C02F1/66—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
- C02F1/722—Oxidation by peroxides
-
- 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
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
- C02F2101/345—Phenols
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/36—Organic compounds containing halogen
-
- 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
- C02F2303/02—Odour removal or prevention of malodour
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physical Water Treatments (AREA)
- Catalysts (AREA)
Abstract
The invention provides a comprehensive wastewater photocatalytic treatment process of tetrabromobisphenol A, which comprises the steps of firstly adjusting the pH value to 3-4, separating organic compounds such as dibromophenol, tribromophenol and the like through acid precipitation, then decomposing the organic compounds remained in an aqueous solution into tribromomethane under the action of ultraviolet light by utilizing a hydrogen peroxide oxidant and the existing acidity; finally extracting and removing the tribromomethane in the water. The invention basically realizes the recycling and utilization of organic matters in the wastewater and innocent treatment, which opens up a new world for the comprehensive wastewater treatment of tetrabromobisphenol A.
Description
Technical Field
The invention belongs to the field of wastewater treatment, and relates to tetrabromobisphenol A wastewater, in particular to a tetrabromobisphenol A comprehensive wastewater photocatalysis treatment process.
Background
The tetrabromobisphenol A has good flame retardant property and wide application range, can be used as a reactive or additive flame retardant, and is commonly used in the production of epoxy resin, polycarbonate, ABS resin and the like. At present, the domestic tetrabromobisphenol A production process is generally characterized in that firstly, a prepared chlorobenzene solvent is pumped into a reaction kettle, then bisphenol A is put into the reaction kettle, stirred and dissolved in the chlorobenzene solvent to form a chlorobenzene solution of bisphenol A, a catalyst is added, liquid bromine is dripped into the reaction kettle containing the chlorobenzene solution of bisphenol A at a set temperature, partial bromination of bisphenol A is carried out, hydrogen bromide is generated, hydrogen peroxide is introduced, the generated brominated hydrogen is oxidized into bromine, the bromination reaction of bisphenol A is continued, more operation steps are needed to truly obtain the tetrabromobisphenol A product, three waste water production ways are needed, firstly, after the bromination reaction is completed, the discharged waste water of water phase belongs to acidic water, alkali addition is needed to neutralize, and then the waste water is discharged into a subsequent treatment tank. And secondly, the solution of the separated chlorobenzene phase is treated by sodium sulfite to convert redundant bromine into sodium bromide and then into sodium sulfate, and then the solution is subjected to layered separation to form second wastewater, and the second wastewater is sent into a subsequent treatment tank. Thirdly, the solution of the separated chlorobenzene phase is washed three times with hot water to remove impurities in the chlorobenzene, and because of the alkalescence, relatively more substances are dissolved in the hot water by some reaction products and byproducts, so that more complex wastewater is formed. The three types of water have five characteristics, namely high organic matter content, relatively high salt content, pungent smell, high chromaticity and slightly alkaline solution. These industrial wastewater is free from biochemical property, has high biochemical toxicity, and such substances with benzene rings are difficult to chemically decompose and enhance biochemical property, so that there is great difficulty in effectively recovering and removing the substances, and a special treatment method is required. The produced comprehensive wastewater has higher biochemical toxicity, the biochemical treatment is almost impossible, and substances with benzene rings in the wastewater are difficult to decompose by adopting a chemical method, so that great difficulty exists in effectively recovering and removing the substances, and the comprehensive wastewater is a great difficulty in the industry, and a special treatment method with higher cost performance needs to be developed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a tetrabromobisphenol A comprehensive wastewater photocatalysis treatment process, wherein the treated wastewater is colorless and odorless, and can reach the emission standard of industrial wastewater.
The technical scheme adopted for solving the technical problems is as follows:
a comprehensive wastewater photocatalytic treatment process of tetrabromobisphenol A comprises the steps of firstly adopting a method of adjusting pH to 3-4 and separating out more organic compounds such as dibromophenol, tribromophenol and the like which are reaction byproducts through an acid precipitation method, then utilizing bromine in wastewater and the existing acidity, utilizing a hydrogen peroxide oxidant to decompose the organic compounds remained in an aqueous solution under the action of ultraviolet light, and converting complex and multicomponent organic matters into single and high-added-value tribromomethane to thoroughly eliminate organic compounds with pungent odor; and then extracting by using benzene according to the characteristics of the tribromomethane, removing the tribromomethane in the water, realizing the effective treatment of the production wastewater, solving the problem which needs to be solved by the same line and protecting the environment.
Preferably, the pH is adjusted with sulfuric acid; more preferably, the pH is adjusted with 5wt% sulfuric acid.
Preferably, the concentration of hydrogen peroxide is 20-40wt%. More preferably, the concentration of hydrogen peroxide is 30wt%.
Preferably, the adding amount of the hydrogen peroxide is 2-15% of the volume of the supernatant after the acid precipitation. The addition amount is more preferably 10%. The control of the addition amount of hydrogen peroxide is extremely important, and does not mean H 2 O 2 The more the amount of the catalyst is, the better the photocatalytic effect is, and an optimal amount is present.
Preferably, the ultraviolet irradiation time is 2-5 hours.
Preferably, the adding amount of the hydrogen peroxide is 10% of the volume of the supernatant after the acid precipitation, and the ultraviolet irradiation time is 2 hours. The best results, the most thorough reaction, the least intermediate products and the highest content of bromoform.
Preferably, the ultraviolet lamp irradiates 800-1200w of power.
Preferably, the solution is aerated while being irradiated with ultraviolet light.
H 2 O 2 The addition amount, aeration and ultraviolet irradiation time of the catalyst have obvious influence on the photocatalysis reaction of tetrabromobisphenol A wastewater.
The invention has the advantages and positive effects that:
1. after acidification, precipitation, sedimentation and separation, a large amount of floc sediments can be obtained, and the sediments can still be processed later and can be used as raw materials of flame retardants.
2. The invention adds a certain amount of H 2 O 2 Solution H under intense irradiation of ultraviolet light 2 O 2 The organic matters in the comprehensive wastewater of the tetrabromobisphenol A can be degraded by decomposing OH.
3. The invention fully proves the feasibility of the treatment means of acid-regulating pretreatment and photocatalytic degradation of the tetrabromobisphenol A comprehensive wastewater, basically realizes the recycling and utilization of organic matters in the wastewater and harmless treatment, and opens up a new world for the tetrabromobisphenol A comprehensive wastewater treatment.
4. The method has simple process and convenient operation, not only effectively recovers more organic compounds such as dibromophenol, tribromophenol and the like which are reaction byproducts, but also gradually removes bromine-containing organic compounds with pungent odor, and realizes the purification treatment of wastewater to reach the emission standard.
Drawings
Fig. 1 is a mass spectrum of a raw water sample.
FIG. 2 is a mass spectrum of the pH adjusted sample.
Fig. 3 shows that, from left to right: adding H into supernatant of tetrabromobisphenol A after regulating pH to 3 2 O 2 After 1ml of the solution, ultraviolet light was irradiated for 2,3,4, and 5 hours, respectively.
Fig. 4 shows, in order from left to right: adding H into supernatant of tetrabromobisphenol A after regulating pH to 3 2 O 2 After 2ml of the solution, ultraviolet light was irradiated for 2,3,4,5 hours, respectively.
Fig. 5 shows, in order from left to right: adding H into supernatant of tetrabromobisphenol A after regulating pH to 3 2 O 2 After 3,5,7ml of solution, the solution was irradiated with ultraviolet light for 2 hours.
To the left of FIG. 6 is the addition of H 2 O 2 2ml of the solution was irradiated with UV light for 4H, with H added on the right 2 O 2 2ml of the solution was then aerated and irradiated with UV light for 4 hours.
FIG. 7 is a pH3 stock solution chromatogram.
FIG. 8 is a diagram of the addition of H 2 O 2 2ml was illuminated for 2h.
FIG. 9 is a diagram of the addition of H 2 O 2 3ml was illuminated for 2h.
FIG. 10 is a diagram of the addition of H 2 O 2 5ml was illuminated for 2h.
FIG. 11 is a diagram of the addition of H 2 O 2 7ml was illuminated for 2h.
FIG. 12 is a diagram of the addition of H 2 O 2 2ml was illuminated for 5h.
FIG. 13 is a chromatogram after 5 extractions with n-hexane.
Detailed Description
The invention is further illustrated by the following examples, which are intended to be illustrative only and not limiting in any way.
Experimental instrument
GCMS-QP2010Ultral gas chromatography-mass spectrometer; photochemical reaction apparatus (model CY-GHX-AC) was produced by Shanghai Naai precision instruments Co., ltd; HAILEA Haili AC0-5505 aeration pump; six-link synchronous coagulation stirrer is produced from West Ruichang laboratory instruments factory in city of gold altar
Experimental reagent
Concentrated sulfuric acid (superior purity) was purchased from the wind ship chemical materials limited company in the Tianjin city; sodium hydroxide (content not less than 96%) is purchased from the light complex technology development limited company in Tianjin; 30wt% H 2 O 2 (analytical grade), purchased from Tianjin municipal chemicals Co., ltd; the tetrabromobisphenol A comprehensive water for experiments is obtained from Tianjin long Arhat put salt field Limited liability company, and is diluted to different degrees according to the experiment design requirement when in use; the water for the experiment is deionized water.
A comprehensive wastewater photocatalytic treatment process of tetrabromobisphenol A comprises the steps of firstly adopting a method of adjusting pH to 3-4 and separating out more organic compounds such as dibromophenol, tribromophenol and the like which are reaction byproducts through an acid precipitation method, then utilizing bromine in wastewater and the existing acidity, utilizing a hydrogen peroxide oxidant to decompose the organic compounds remained in an aqueous solution under the action of ultraviolet light, and converting complex and multicomponent organic matters into single and high-added-value tribromomethane to thoroughly eliminate organic compounds with pungent odor; and then extracting by using benzene according to the characteristics of the tribromomethane, removing the tribromomethane in the water, realizing the effective treatment of the production wastewater, solving the problem which needs to be solved by the same line and protecting the environment.
The tetrabromobisphenol A comprehensive wastewater discharged in the production process is alkaline, the pH value is between 7 and 8, the colored groups in the wastewater exist in the form of soluble salts under the alkaline condition, when a certain amount of acid is added, the soluble salts are replaced by H+ in the solution to generate phenol substances which are difficult to dissolve in water, and white floccules are separated out from the solution.
The acidification operation has great influence on the water quality of the tetrabromobisphenol A comprehensive wastewater, and most organic matters in the wastewater can be effectively removed after the acidification pretreatment. The optimal pH for acidification should be between 3 and 4. In order to prove the effect of acidification pretreatment, the original water sample before acidification and the water sample after acidification are extracted, normal hexane is selected as an extractant, the water sample and the normal hexane are fully mixed according to the proportion of 1:10, so that organic matters in the water sample are dissolved in an organic phase, and the components in the organic matters are qualitatively and quantitatively analyzed by using a GCMS-QP2010Ultral gas chromatograph, so that a mass spectrum is obtained, as shown in figure 1. Analysis of the mass spectrum is shown in table 1.
TABLE 1
The mass spectrum of the sample after pH adjustment is shown in FIG. 2, and the analysis of the mass spectrum is shown in Table 2.
TABLE 2
By comparing the mass spectrograms of raw water and acidified water, it can be known that a large amount of floc sediment can be obtained after acidification, precipitation, sedimentation and separation, the sediment can still be treated later and used as a raw material of a flame retardant, and the removal rates of 2,4 dibromophenol, 2,6 dibromophenol and extremely toxic 2,4,6 tribromophenol in the raw water are 64.76%,54.26% and 90.52% respectively after acidification. There is still some residual amount in the supernatant, especially 2,4,6 tribromophenol, which still results in a strong pungent odor and therefore needs to be removed further. The comprehensive wastewater after acid regulation is kept stand and precipitated for 1 hour, a large amount of floccules precipitated at the bottom are filtered, and the supernatant is reserved, so that the supernatant possibly contains a small amount of organic matters with dyeing groups. While this portion of the remaining volatile irritating organics is considered to be degraded by photocatalysis. During the experiment, a certain amount of H is added 2 O 2 Solution H under intense irradiation of ultraviolet light 2 O 2 The organic matters in the comprehensive wastewater of the tetrabromobisphenol A can be degraded by decomposing OH.
Investigation of different H 2 O 2 Influence of the addition amount and the ultraviolet irradiation time on the photocatalytic reaction
50ml of pH-adjusted supernatant was taken and added with H 2 O 2 (30 wt%) solutions, control H separately 2 O 2 The adding amount of the solution is 1,2,3,5,7ml, the sample is transferred into a quartz test tube, the solution is irradiated by an ultraviolet lamp (power 1000 w) in a photocatalysis instrument, the irradiation time of ultraviolet light is respectively controlled to be 2,3,4,5h, then the condition is observed,
fig. 3 shows that, from left to right: adding H into supernatant of tetrabromobisphenol A after regulating pH to 3 2 O 2 After 1ml of the solution, ultraviolet light was irradiated for 2,3,4, and 5 hours, respectively.
Fig. 4 shows, in order from left to right: adding H into supernatant of tetrabromobisphenol A after regulating pH to 3 2 O 2 After 2ml of the solution, ultraviolet light was irradiated for 2,3,4,5 hours, respectively.
Fig. 5 shows, in order from left to right: adding H into supernatant of tetrabromobisphenol A after regulating pH to 3 2 O 2 After 3,5,7ml of solution, the solution was irradiated with ultraviolet light for 2 hours.
The experimental results are shown as follows: adding H into the supernatant with pH of 3 before ultraviolet irradiation 2 O 2 The color of the solution changes immediately, i.e. from original yellowish to dark yellow. As shown in FIG. 3, add H 2 O 2 After 1ml of the solution, the color of the solution gradually changes from the original deep yellow to light yellow along with the extension of the ultraviolet irradiation time. The supernatant of tetrabromobisphenol A after the pH of the raw water is adjusted to pH3 has an offensive odor in terms of smell. Adding H 2 0 2 After the solution, under the action of ultraviolet light, the pungent smell gradually changes into a mellow smell, and the original pungent smell gradually disappears and the mellow smell gradually deepens along with the extension of the ultraviolet light irradiation time. As shown in FIG. 4, add H 2 O 2 After 2ml of the solution, the color of the solution gradually changes from the original deep yellow to colorless and transparent with the extension of the ultraviolet irradiation time (the solution is nearly colorless under the ultraviolet irradiation for 3 hours). As shown in FIG. 5, H was added under the condition of ultraviolet irradiation for 2 hours 2 O 2 After 3,5,7ml of the solution, the color of the solution became totally colorless and the smell was totally exhibited as a mellow smell.
Effect of aeration on photocatalytic reactions
The experimental process comprises the following steps: 50ml of pH3 supernatant was taken and H was added 2 O 2 (30 wt%) solution, control H 2 O 2 The addition amount of the solution is 2ml, the sample is transferred into a quartz test tube, and is irradiated by an ultraviolet lamp (power 1000 w) in a photocatalysis instrument and is connected with an aeration device, and the irradiation time of ultraviolet light is controlledFor 4h, then observe the situation:
to the left of FIG. 6 is the addition of H 2 O 2 2ml of the solution was irradiated with UV light for 4H, with H added on the right 2 O 2 2ml of the solution was then aerated and irradiated with UV light for 4 hours.
To sum up: h 2 O 2 The addition amount, aeration and ultraviolet irradiation time of the catalyst have obvious influence on the photocatalysis reaction of tetrabromobisphenol A wastewater.
Sample gas chromatographic analysis after photocatalytic reaction
To investigate and clarify the composition of organics in tetrabromobisphenol a complex wastewater and to compare the changes in organic composition before and after photocatalytic reaction. Firstly, transferring organic compound into organic phase, so we choose extraction method, using typical n-hexane extractant, mixing n-hexane with water sample according to the ratio of 10:1, and separating n-hexane phase according to conventional extraction method to form sample. And then adopting a gas chromatography-mass spectrometry method, deducing by means of a computer database optimization method according to mass numbers and characteristics of tetrabromobisphenol A production, and obtaining extremely reliable chemical names and corresponding concentrations (area ratios) for different components. Wherein the laboratory instrument selected GCMS-QP2010Ultral, the specific set of operating parameters are shown in table 3 below.
TABLE 3 GCMS-QP2010Ultral operating parameter set results
Respectively adding pH3 stock solution, H 2 O 2 The addition amount is 2,3,5,7ml, the illumination is 2H and H 2 O 2 And (3) adding 2ml of the sample subjected to illumination for 5 hours for extraction, and then carrying out qualitative and quantitative analysis by using a GCMS-QP2010Ultral instrument.
FIG. 7 is a pH3 stock solution chromatogram, and analysis of the chromatogram is shown in Table 4.
TABLE 4 Table 4
Based on the results of the gas chromatography analysis of the sample after the acid-to-pH 3 treatment, the main substances in the sample are mostly bromine-containing phenols, such as: 4-bromophenol, 2, 4-dibromo-phenol, 2, 6-dibromo-phenol, 4-bromo-2, 5-dichlorophenol, 2, 6-dichloro-4-nitrophenol, 2,4, 6-tribromophenol. These materials are insoluble or slightly soluble in water under acidic conditions. Besides, benzene-ring-containing substances such as chlorobenzene and toluene, and 2, 5-dimethyltetrahydrofuran. Therefore, the pH is basically determined to be acidic, so that excessive bromine-containing organic compounds and benzene ring-containing organic compounds are separated out from the water phase, and the organic compounds are settled and separated by utilizing the characteristic that the specific gravity is greater than that of water, thereby obtaining supernatant fluid, and most of organic matters in the water phase can be removed.
FIG. 8 is a diagram of the addition of H 2 O 2 2ml was illuminated for 2h and the analysis of this chromatogram is shown in Table 5.
TABLE 5
According to addition of H 2 O 2 The results of the gas chromatography-mass spectrometry analysis of 2ml of the photocatalytic reaction for 2 hours after-treatment sample can be seen as follows: compared with the pH3 stock solution, the sample contains a plurality of new substances, namely alcohols, ketones and alkanes, wherein the main components are tribromomethane and 2,4, 6-tribromophenol, and the ratio of the main components is 23.8 and 43.1 respectively. And compared with the content of 2,4, 6-tribromophenol before the photocatalytic reaction, the removal rate is 53.8 percent. After the photocatalytic reaction, it was found by analysis that bromoform was newly formed in the sample, and it was considered that chlorobenzene, 2, 4-dibromo-phenol, 2, 6-dibromo-phenol and 2,4, 6-tribromophenol were converted. Based on the analysis of the sample composition, 2, 3-diethyl-ethylene oxide, 3-hexanone, 2-hexanone, 3-hexanol, 2 were present in the sampleEthyl-hexanoic acid, presumably, the large pi bond of benzene ring in tribromophenol is knocked out under the condition of photocatalysis reaction, alkane is converted, further alkane can be converted into alcohol, and alcohol is converted into ketone after adding oxygen. The smell of the alcohol smelled in the sample after photocatalysis is considered to be the mixture of the smell of alcohols, ketones and tribromomethane. In addition, 3, 5-dibromo-4-hydroxybenzaldehyde is converted into 3, 5-dibromo-4-hydroxybenzoic acid under the action of photocatalysis, and the equation can be expressed as follows:
FIG. 9 is a diagram of the addition of H 2 O 2 3ml was illuminated for 2h and the analysis of this chromatogram is shown in Table 6.
TABLE 6
/>
According to addition of H 2 O 2 The results of the gas chromatography-mass spectrometry analysis of 3ml of the 2h post-treatment sample of the photocatalytic reaction can be seen as follows: the more pronounced peak numbers are 1,2, 12, 17, 18, 21, 22, respectively. Comparative analysis showed that the peak areas of 3-hexanone, 2-hexanone, 3-hexanol, etc. were reduced, whereas 1, 1-dibromoacetoneAnd 1, 1-tribromoacetone, so that 3-hexanone, 2-hexanone, 3-hexanol, etc. can be considered as intermediate products of photocatalytic reactions. In addition, the content of 2,4, 6-tribromophenol is further reduced, the removal rate reaches 98.1%, and the content of tribromo-methane is further increased. Some minor amounts of dichloromonobromomethane are also present in the sample, considered to be partially converted from bromoform.
FIG. 10 is a diagram of the addition of H 2 O 2 The chromatogram after 2h of illumination with 5ml is analyzed as shown in Table 7.
TABLE 7
/>
According to addition of H 2 O 2 The results of the gas chromatography-mass spectrometry analysis of 5ml of the post-treatment sample for 2 hours of the photocatalytic reaction can be seen as follows: as shown in FIG. 10, 5ml of H was added 2 O 2 Only 2 more significant peaks were found in the chromatogram after 2h of photocatalysis, respectively peak numbers 7 and 11, and the corresponding substances were bromoform and 17. Alpha. -methyltestosterone, with peak areas of 81.48% and 11.1%, respectively. By comparative analysis, it was found that part of the intermediate product disappeared, and a new substance of 17. Alpha. -methyltestosterone was produced, and we could consider 17. Alpha. -methyltestosterone as the final product of the photocatalytic reaction. The content of the 2,4, 6-tribromophenol is not detected, and the removal rate reaches 100%.
In addition, we can conclude that: adding H 2 O 2 The best effect is obtained after 2 hours of photocatalytic reaction in 5ml, the most thorough reaction, the least intermediate products and the highest content of bromoform.
FIG. 11 is a diagram of the addition of H 2 O 2 7ml was illuminated for 2h and the analysis of this chromatogram is shown in Table 8.
TABLE 8
/>
According to addition of H 2 O 2 The results of the gas chromatography-mass spectrometry analysis of 7ml of the sample treated after 2 hours of photocatalytic reaction are shown as follows: comparative addition of H 2 O 2 For 2H in 5ml of photocatalytic reaction, a large part of the intermediate product remained in the sample, and 31.92% of 2,4, 6-tribromophenol was also present, indicating H 2 O 2 The adding amount of the catalyst has a certain influence on the photocatalytic reaction, mainly because hydrogen peroxide can generate a large amount of hydroxyl free radicals under the acidic condition, and because of excessive hydrogen peroxide, the hydroxyl free radicals can quench with the hydrogen peroxide, but the concentration of the hydroxyl free radicals is reduced, and the decomposition of benzene rings contained in 2,4, 6-tribromophenol and the like is influenced, so that the content of the 2,4, 6-tribromophenol is still high. The method fully shows that the hydrogen peroxide adding amount has an optimal operation condition in the decomposition reaction, and two important operation conditions are constructed with the reaction time, the concentration of the hydrogen peroxide is low, the reaction time can be prolonged, the decomposition efficiency is improved, but the most critical is the hydrogen peroxide adding amount, because of the quenching reaction, the hydrogen peroxide adding amount control is extremely important, and the hydrogen peroxide adding amount is not meant to be H 2 O 2 The more the amount of addition, the better the photocatalytic effect, and the optimum amount of addition exists, which can be easily confirmed from the chromatogram.
FIG. 12 is a diagram of the addition of H 2 O 2 2ml was illuminated for 5h and the analysis of this chromatogram is shown in Table 9.
TABLE 9
/>
According to addition of H 2 O 2 The results of the gas chromatography-mass spectrometry analysis of 2ml of the post-treatment sample for 5 hours of the photocatalytic reaction can be seen as follows: the light reaction time is also an important influencing factor of the photocatalytic reaction, and the longer the photocatalytic reaction time is, the more thorough the catalytic reaction is, and can be easily confirmed from the figure.
By comparing the several peak patterns, the addition of H can be clearly found 2 O 2 The treatment effect is best when 5ml of light is irradiated for 2 hours. Through the pretreatment of adjusting acid and the treatment of photocatalysis reaction, most substances in the solution are completely converted into colorless stable tribromomethane. Table 10 below shows the removal rate under each treatment.
TABLE 10 data analysis-removal Rate against raw Water
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As shown in table 10: after tetrabromobisphenol A comprehensive wastewater is subjected to acid conditioning pretreatment and photocatalysis reaction treatment, most of pollutants in the solution are as follows: 2, 4-dibromo-phenol, 2, 6-dibromo-phenol, 2,4, 6-tribromophenol and the like can be effectively removed with a removal rate of up to 100 percent, and colorless stable tribromomethane is generated. The bromoform is also called bromoform, has chloroform smell, is slightly soluble in water, is soluble in ethanol, diethyl ether, chloroform and benzene, can be used as an intermediate for organic synthesis and for pharmaceutical preparation, but has high toxicity, is carcinogenic, can be gradually decomposed into yellow liquid after long-term storage, can be accelerated by air and light, and can be added with 4% ethanol as a stabilizer. From the results of the gas chromatogram, the substances after photocatalytic degradation are mostly alkane, alcohol, ketone and other substances, which are easily dissolved in the organic phase according to the similar compatibility principle, so we choose the substance with the best treatment effect (namely H 2 O 2 2ml of sample which was irradiated for 5 h) was repeatedly extracted 5 times with an organic phase (n-hexane) so that the organic matter in the aqueous phase was turned over after the photocatalysisMoving to n-hexane, finally, extracting the aqueous phase after 5 times of extraction and n-hexane again according to the ratio of 10:1, and then detecting and evaluating the extracted oil phase by using a gas chromatograph-mass spectrometer to obtain a chromatogram after 5 times of extraction by using n-hexane in FIG. 13, wherein the analysis of the chromatogram is shown in Table 11.
TABLE 11
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The feasibility of the treatment means of the tetrabromobisphenol A comprehensive wastewater through the acid regulating pretreatment and the photocatalytic degradation is fully verified through the treatment and analysis of the whole experiment, the recycling and the utilization of organic matters in the wastewater and the harmless treatment are basically realized, and a new world is opened up for the tetrabromobisphenol A comprehensive wastewater treatment.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that variations and modifications can be made without departing from the scope of the invention.
Claims (6)
1. A comprehensive wastewater photocatalytic treatment process for tetrabromobisphenol A is characterized in that the pH is adjusted to 3-4, 2, 4-dibromophenol, 2, 6-dibromophenol and 2,4, 6-tribromophenol organic compounds are separated through acid precipitation, bromine in wastewater and the existing acidity are used, and the organic compounds remained in an aqueous solution are decomposed into tribromomethane under the action of ultraviolet light by utilizing a hydrogen peroxide oxidant; finally extracting and removing the tribromomethane in the water, wherein the concentration of the hydrogen peroxide is 20-40wt%, the adding amount of the hydrogen peroxide is 2-15% of the volume of the supernatant after the acid precipitation, the ultraviolet irradiation time is 2-5h, and the irradiation power of an ultraviolet lamp is 800-1200w.
2. The process for photocatalytic treatment of tetrabromobisphenol a integrated wastewater according to claim 1, wherein the process is characterized in that: the pH value is adjusted by sulfuric acid.
3. The process for photocatalytic treatment of tetrabromobisphenol a integrated wastewater according to claim 2, wherein the process is characterized in that: the pH was adjusted with 5wt% sulfuric acid.
4. The process for photocatalytic treatment of tetrabromobisphenol a integrated wastewater according to claim 1, wherein the process is characterized in that: the concentration of hydrogen peroxide is 30wt%.
5. The process for photocatalytic treatment of tetrabromobisphenol a integrated wastewater according to claim 1, wherein the process is characterized in that: the adding amount of the hydrogen peroxide is 10% of the volume of the supernatant after the acid precipitation, and the ultraviolet irradiation time is 2 hours.
6. The process for photocatalytic treatment of tetrabromobisphenol a integrated wastewater according to claim 1, wherein the process is characterized in that: the solution was aerated while uv light was irradiated.
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| CN102583849A (en) * | 2012-02-28 | 2012-07-18 | 天津工业大学 | Treatment technique of tetrabromobisphenol A production wastewater |
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