CN112939304B - Method for treating halogenated organic wastewater by using advanced reduction-oxidation coupling system based on magnesium method flue gas desulfurization slag - Google Patents
Method for treating halogenated organic wastewater by using advanced reduction-oxidation coupling system based on magnesium method flue gas desulfurization slag Download PDFInfo
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 39
- 230000023556 desulfurization Effects 0.000 title claims abstract description 39
- 239000002351 wastewater Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000002893 slag Substances 0.000 title claims abstract description 27
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 24
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 239000003546 flue gas Substances 0.000 title claims abstract description 24
- 239000011777 magnesium Substances 0.000 title claims abstract description 24
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 24
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 20
- 230000008878 coupling Effects 0.000 title claims abstract description 14
- 238000010168 coupling process Methods 0.000 title claims abstract description 14
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 14
- 238000005695 dehalogenation reaction Methods 0.000 claims abstract description 17
- 230000009467 reduction Effects 0.000 claims abstract description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000001301 oxygen Substances 0.000 claims abstract description 13
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 13
- 239000002699 waste material Substances 0.000 claims description 21
- 239000005416 organic matter Substances 0.000 claims description 14
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 10
- 229910052753 mercury Inorganic materials 0.000 claims description 10
- 238000006864 oxidative decomposition reaction Methods 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 230000001678 irradiating effect Effects 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 230000007613 environmental effect Effects 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000003054 catalyst Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 229910000314 transition metal oxide Inorganic materials 0.000 claims description 4
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims description 3
- 239000002957 persistent organic pollutant Substances 0.000 claims description 3
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 2
- 229910052731 fluorine Inorganic materials 0.000 claims description 2
- 229910052736 halogen Inorganic materials 0.000 claims description 2
- 150000002367 halogens Chemical class 0.000 claims description 2
- 229910052740 iodine Inorganic materials 0.000 claims description 2
- -1 hydrogen free radical Chemical class 0.000 abstract description 9
- 230000033558 biomineral tissue development Effects 0.000 abstract description 6
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 abstract description 4
- 239000001257 hydrogen Substances 0.000 abstract description 4
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 4
- 238000011065 in-situ storage Methods 0.000 abstract description 3
- 230000001590 oxidative effect Effects 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 abstract description 3
- 230000004913 activation Effects 0.000 abstract description 2
- 230000036571 hydration Effects 0.000 abstract description 2
- 238000006703 hydration reaction Methods 0.000 abstract description 2
- 230000033116 oxidation-reduction process Effects 0.000 abstract description 2
- 239000002910 solid waste Substances 0.000 abstract description 2
- 230000001502 supplementing effect Effects 0.000 abstract description 2
- 238000006722 reduction reaction Methods 0.000 description 12
- 230000003647 oxidation Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 4
- MYSWGUAQZAJSOK-UHFFFAOYSA-N ciprofloxacin Chemical compound C12=CC(N3CCNCC3)=C(F)C=C2C(=O)C(C(=O)O)=CN1C1CC1 MYSWGUAQZAJSOK-UHFFFAOYSA-N 0.000 description 4
- 238000011946 reduction process Methods 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- HSQFVBWFPBKHEB-UHFFFAOYSA-N 2,3,4-trichlorophenol Chemical compound OC1=CC=C(Cl)C(Cl)=C1Cl HSQFVBWFPBKHEB-UHFFFAOYSA-N 0.000 description 2
- 239000003242 anti bacterial agent Substances 0.000 description 2
- 229940088710 antibiotic agent Drugs 0.000 description 2
- 238000006065 biodegradation reaction Methods 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229960003405 ciprofloxacin Drugs 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 150000004820 halides Chemical class 0.000 description 2
- 150000008282 halocarbons Chemical class 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 2
- 235000019341 magnesium sulphate Nutrition 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 150000003071 polychlorinated biphenyls Chemical class 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 238000009303 advanced oxidation process reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 231100000693 bioaccumulation Toxicity 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000006298 dechlorination reaction Methods 0.000 description 1
- 238000006115 defluorination reaction Methods 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- JESHZQPNPCJVNG-UHFFFAOYSA-L magnesium;sulfite Chemical compound [Mg+2].[O-]S([O-])=O JESHZQPNPCJVNG-UHFFFAOYSA-L 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000003993 organochlorine pesticide Substances 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—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
- C02F1/70—Treatment of water, waste water, or sewage by reduction
-
- 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
- C02F2101/36—Organic compounds containing halogen
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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)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention belongs to the technical field of solid waste recycling and advanced oxidation-reduction treatment of wastewater, and particularly relates to a method for treating halogenated organic wastewater by an advanced reduction-oxidation coupling system based on magnesium flue gas desulfurization slag. The system utilizes ultraviolet light to release SO from magnesium flue gas desulfurization slag 3 ‑ Activated under the anoxic condition of the system to generate the hydration electrons with strong reducibilitye aq ‑ And hydrogen free radical H breaks the C-X bond of the halogenated organic matters to realize the reduction dehalogenation of the halogenated organic matters; introducing oxygen (supplementing dissolved oxygen) in situ after the dehalogenation stage is completed, and releasing SO (sulfur dioxide) from the desulfurization slag 3 ‑ With dissolved oxygen O 2 Under the activation of ultraviolet light, strong oxidizing sulfate radical SO is generated 4 ·‑ The dehalogenated organic matters are further oxidized and decomposed into micromolecular organic matters until mineralization, so that the biodegradability of the wastewater is improved, and the organic pollution load is reduced.
Description
Technical Field
The invention belongs to the technical field of solid waste recycling and advanced oxidation-reduction treatment of wastewater, and particularly relates to a method for treating halogenated organic wastewater by an advanced reduction-oxidation coupling system based on magnesium flue gas desulfurization slag.
Background
Organic halogenides are widely used as raw materials, intermediates, solvents and the like in organic synthesis, and have remarkable effects in human production and life. The use and discharge of a large amount of halogenated organic matters make the pollution of halogenated matters in water body increasingly serious, and threaten ecological safety and human health. Such as halogenated hydrocarbons, polychlorinated biphenyls, organochlorine pesticides, antibiotics and perfluorooctasulfonic acid type contaminants are representative of the refractory organic contaminants that are widely present in water bodies. A large number of researches show that the halogenated organic pollutants have the characteristics of environmental persistence, difficult biodegradation, bioaccumulation, high toxicity, long-distance migration capability and the like, are distributed in field environments such as soil, atmosphere and the like, and how to effectively solve the halogenated pollutants has become a focus of attention in the environmental field. Common halogenated organic matter treatment methods include adsorption, incineration, wet catalytic oxidation, chemical reduction with a noble metal having hydrogen storage capacity, advanced oxidation, advanced reduction, and the like. Advanced reduction processes can generate strongly reducing hydrated electrons in the systeme aq - And the hydrogen free radical H breaks the C-X bond to have stronger dehalogenation effect, thereby breaking the structure of the halogenide and improving the biodegradability. Advanced oxidation techniques utilize strong oxidizing groups such as hydroxyl radicals (OH) · ) Sulfate radical (SO) 4 ·- ) Etc. through a series ofThe chain reaction oxidizes and decomposes the organic matters into small molecules until degradation and mineralization. For halogenated organic matters, the degradation of the organic matters can be realized by a high-grade oxidation method and a high-grade reduction method, compared with the high-grade reduction process, the high-grade reduction process has higher dehalogenation performance, and the high-grade oxidation method has higher efficiency in the degradation mineralization of the organic matters.
The basic principle of the wet magnesium method flue gas desulfurization technology is similar to that of the traditional wet lime-gypsum method, and magnesium oxide slurry is used as an absorbent and fully contacted with flue gas in an absorption tower, SO that SO in the flue gas is reduced 2 Absorbs and is immobilized in the form of sulfite. The desulfurization waste mainly comprises magnesium sulfite, a small amount of magnesium sulfate, magnesium carbonate and unreacted desulfurizing agent magnesium hydroxide. The waste treatment method mainly comprises a discarding method, a forced oxidation magnesium sulfate recovery method and a pyrolysis magnesium oxide regeneration method. However, the above process is relatively high in capital investment and operating costs, and desulfurization costs can be significantly reduced only when the recovered product can be opened. Therefore, it is important to find a low-cost desulfurization waste treatment method or a resource utilization mode.
Disclosure of Invention
The invention provides a method for treating halogenated organic matter wastewater based on a high-grade reduction-oxidation coupling system of magnesium flue gas desulfurization slag, which utilizes ultraviolet light to release SO released by the magnesium flue gas desulfurization slag 3 - Activated under the anoxic condition of the system to generate the hydration electrons with strong reducibilitye aq - And hydrogen free radical H breaks the C-X bond of the halogenated organic matters to realize the reduction dehalogenation of the halogenated organic matters; introducing oxygen (supplementing dissolved oxygen) in situ after the dehalogenation stage is completed, and releasing SO (sulfur dioxide) from the desulfurization slag 3 - With dissolved oxygen O 2 Under the activation of ultraviolet light, strong oxidizing sulfate radical SO is generated 4 ·- The dehalogenated organic matters are further oxidized and decomposed into micromolecular organic matters until mineralization, so that the biodegradability of the wastewater is improved, and the organic pollution load is reduced. The invention realizes the high added value recycling of wastes while carrying out innocent treatment on halogenated organics and desulfurization residues in the wastewater, achieves the aim of treating wastes with the wastes, and has remarkable economic benefit,Social and environmental benefits.
1. A method for treating halogenated organic matter wastewater based on an advanced reduction-oxidation coupling system of magnesium flue gas desulfurization slag comprises the following steps:
(1) Drying and crushing waste residues generated by a wet magnesium flue gas desulfurization system which is operated stably, grinding the waste residues through a 80-mesh sieve, and bagging the sieved powder for later use;
(2) Reduction dehalogenation stage: placing a certain amount of halogenated organic matter wastewater into a reaction tank, adding a certain amount of pretreated desulfurization slag, and introducing nitrogen to remove dissolved oxygen in the system; regulating pH of the system to be 3.0-9.0, continuously stirring, and continuously irradiating for 15-180 min by adopting a low-pressure mercury lamp (UVC wave band ultraviolet light);
(3) Oxidative decomposition stage: after the reduction dehalogenation stage is completed, continuously adding a certain amount of pretreated desulfurization slag and nano transition metal oxide catalyst into the wastewater, and slowly introducing air to increase dissolved oxygen; regulating pH of the system to be 5.0-9.0, continuously stirring, and continuously irradiating for 15-180 min by adopting a low-pressure mercury lamp (UVC wave band ultraviolet light);
(4) The ph=6.0-7.0 of the treated wastewater was adjusted and the water was filtered.
The magnesium desulfurization slag is waste generated by a wet magnesium flue gas desulfurization system, and can realize the slow release of sulfite in the system.
The organic halide is an environmental persistent organic pollutant containing halogen elements such as F, cl, br and I, and is common such as halogenated hydrocarbon, polychlorinated biphenyl, organic chlorine pesticide, antibiotics and the like, and has stable property and difficult biodegradation.
The mass of the desulfurization waste added in the reduction dehalogenation stage is about 30-60 times of that of the organic halide, and the reaction pH=2.0-9.0 is controlled.
The reduction dehalogenation stage adopts a low-pressure mercury lamp as a light source (UVB wave band ultraviolet light), and the irradiation time is 15-120min.
The catalyst used in the oxidative decomposition stage is nano-scale transition metal oxide such as TiO 2 ZnO and Fe 2 O 3 One or more of them.
The quality of the desulphurized slag added in the oxidative decomposition stage is about 10-40 times of the quality of organic matters in the wastewater, and the reaction pH=5.0-9.0 is controlled.
The light source in the oxidative decomposition stage adopts a low-pressure mercury lamp (UVB wave band ultraviolet light) to continuously irradiate for 15-120min.
The advanced reduction-oxidation coupling system is based on active substances generated in the process of activating desulfurization slag by ultraviolet light, and the in-situ switching of the advanced reduction and advanced oxidation processes is realized by controlling conditions such as the content of dissolved oxygen, the pH value and the like.
Compared with the prior art, the invention has the characteristics and beneficial effects that:
the invention has good effect of removing halogenated organic matters in the wastewater, realizes the low-cost and high-added-value utilization of the flue gas desulfurization waste, achieves the purpose of treating the waste with the waste, and has remarkable economic benefit, social benefit and environmental benefit.
Drawings
FIG. 1 is a photograph of magnesium desulfurization slag used in the examples of the present invention.
FIG. 2 shows XRD patterns of magnesium desulfurization slag used in the examples of the present invention.
Detailed Description
The methods and techniques of the present invention are described below by way of example, and are not limited in their practical application.
Example 1
The method for treating halogenated organic matter wastewater based on the advanced reduction-oxidation coupling system of the magnesium flue gas desulfurization slag in the embodiment comprises the following steps of:
(1) Drying and crushing waste residues generated by a wet magnesium flue gas desulfurization system which is operated stably, grinding the waste residues through a 80-mesh sieve, and bagging the sieved powder for later use;
(2) Reduction dehalogenation stage: taking ciprofloxacin (C) with concentration of 500 mL of 30 mg/L 17 H 18 FN 3 O 3 ) Adding 0.4 g desulfurization slag into the wastewater in a reaction tank, and introducing nitrogen to remove dissolved oxygen in the system after the wastewater is fully mixed; adjusting the pH of the system to be=5.0, continuously stirring,continuously irradiating for 40min by adopting a UVC wave band low-pressure mercury lamp;
(3) Oxidative decomposition stage: after the reduction dehalogenation stage is completed, continuously adding 0.2g of desulfurization slag and 5mg of nano alpha-Fe into the wastewater 2 O 3 Introducing air at a speed of 0.8L/min; adjusting the pH of the system to be 7.5, continuously stirring, and continuously irradiating for 120min by adopting a low-pressure mercury lamp (UVC wave band ultraviolet light);
(4) The ph=6.0-7.0 of the treated wastewater was adjusted and the water was filtered.
After the treatment, the defluorination rate of the ciprofloxacin in the wastewater is measured to be more than 98%, and the mineralization rate of the organic matters is measured to be 85%.
Example 2
The method for treating halogenated organic matter wastewater based on the advanced reduction-oxidation coupling system of the magnesium flue gas desulfurization slag in the embodiment comprises the following steps of:
(1) Drying and crushing waste residues generated by a wet magnesium flue gas desulfurization system which is operated stably, grinding the waste residues through a 80-mesh sieve, and bagging the sieved powder for later use;
(2) Reduction dehalogenation stage: taking 500 mL trichlorophenol (C) with concentration of 50mg/L 6 H 3 Cl 3 O) adding 0.6 g desulfurization waste into the reaction tank, and introducing nitrogen to remove dissolved oxygen in the system after the waste is fully mixed; adjusting the pH of the system to be 8.0, continuously stirring, and continuously irradiating for 100 min by adopting a low-pressure mercury lamp (UVC wave band ultraviolet light);
(3) Oxidative decomposition stage: after the reduction dehalogenation stage is completed, continuously adding 0.3 g desulfurization slag and 6mg nano TiO into the wastewater 2 Introducing air at a speed of 0.8L/min; adjusting the pH of the system to be 7.0, continuously stirring, and continuously irradiating for 120min by adopting a low-pressure mercury lamp (UVC wave band ultraviolet light);
(4) The ph=6.0-7.0 of the treated wastewater was adjusted and the water was filtered.
After the treatment, the dechlorination rate of the trichlorophenol of the wastewater is measured to be more than 98%, and the mineralization rate of the organic matters is measured to be 90%
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto,
any person skilled in the art, within the scope of the present disclosure, according to the technical solution of the present invention and the present invention
The inventive concept is intended to be covered by the scope of the invention, with equivalents and modifications.
Claims (5)
1. A method for treating halogenated organic matter wastewater based on a high-grade reduction-oxidation coupling system of magnesium flue gas desulfurization slag is characterized by comprising the following steps of:
(1) Drying and crushing waste residues generated by a wet magnesium flue gas desulfurization system which is operated stably, grinding the waste residues through a 80-mesh sieve, and bagging the sieved powder for later use; the powder can slowly release sulfite in a system;
(2) Reduction dehalogenation stage: placing a certain amount of halogenated organic matter wastewater into a reaction tank, adding a certain amount of pretreated powder, and introducing nitrogen to remove dissolved oxygen in a system; regulating pH=3.0-9.0, continuously stirring, and continuously irradiating with UVC band ultraviolet light in a low pressure mercury lamp for 15-180 min;
(3) Oxidative decomposition stage: after the reduction dehalogenation stage is completed, continuously adding a certain amount of pretreated powder and nano transition metal oxide catalyst into the wastewater, and slowly introducing air to increase dissolved oxygen; regulating pH=5.0-9.0, continuously stirring, and continuously irradiating with UVC band ultraviolet light in a low pressure mercury lamp for 15-180 min;
(4) The ph=6.0-7.0 of the treated wastewater was adjusted and the water was filtered.
2. The method for treating halogenated organic matter wastewater by using the advanced reduction-oxidation coupling system based on magnesium flue gas desulfurization slag according to claim 1, wherein the halogenated organic matter is an environmental persistent organic pollutant containing halogen elements F, cl, br or I, and the method is stable in property and difficult to biodegrade.
3. The method for treating halogenated organic matter wastewater by using an advanced reduction-oxidation coupling system based on magnesium flue gas desulfurization slag according to claim 1, wherein the mass of the powder added in the reduction dehalogenation stage is 30-60 times of the mass of halogenated organic matter.
4. The method for treating halogenated organic wastewater by using a high-grade reduction-oxidation coupling system based on magnesium flue gas desulfurization slag as claimed in claim 1, wherein the catalyst used in the oxidative decomposition stage is nano-scale transition metal oxide TiO 2 ZnO and Fe 2 O 3 One or more of them.
5. The method for treating halogenated organic matter wastewater by using an advanced reduction-oxidation coupling system based on magnesium flue gas desulfurization slag according to claim 1, wherein the mass of the powder added in the oxidative decomposition stage is 10-40 times of the mass of halogenated organic matter in the wastewater.
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| US6150157A (en) * | 1994-09-23 | 2000-11-21 | The Regents Of The University Of California | Reductive dehalogenation of organic halides in contaminated groundwater |
| CN103708648B (en) * | 2013-12-26 | 2015-08-19 | 清华大学 | The method of reduction-Fenton oxidation coupling processing azo dyeing waste water |
| CN103920702B (en) * | 2014-04-04 | 2015-12-09 | 青岛欧帝欧环保科技发展有限公司 | A kind of advanced oxidation reduction innocuity disposal system of waste pollutant and method |
| CN110357347B (en) * | 2019-06-13 | 2022-03-29 | 华南师范大学 | Method for treating wastewater by persulfate advanced oxidation coupling biological sulfate reduction |
| CN110372048B (en) * | 2019-06-21 | 2022-04-22 | 深圳市慧创源环保科技有限公司 | Method for removing organic matters in water |
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