CN114634265A - photo-Fenton process for treating refractory organic wastewater - Google Patents
photo-Fenton process for treating refractory organic wastewater Download PDFInfo
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- CN114634265A CN114634265A CN202210258991.8A CN202210258991A CN114634265A CN 114634265 A CN114634265 A CN 114634265A CN 202210258991 A CN202210258991 A CN 202210258991A CN 114634265 A CN114634265 A CN 114634265A
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000002351 wastewater Substances 0.000 title claims abstract description 35
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 43
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000002156 mixing Methods 0.000 claims abstract description 27
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims abstract description 21
- 230000001699 photocatalysis Effects 0.000 claims abstract description 19
- 238000003756 stirring Methods 0.000 claims abstract description 14
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000005273 aeration Methods 0.000 claims abstract description 13
- 229910001448 ferrous ion Inorganic materials 0.000 claims abstract description 13
- 238000010992 reflux Methods 0.000 claims abstract description 13
- 239000003814 drug Substances 0.000 claims abstract description 12
- 229910001447 ferric ion Inorganic materials 0.000 claims abstract description 11
- 238000004064 recycling Methods 0.000 claims abstract description 11
- 230000001105 regulatory effect Effects 0.000 claims abstract description 9
- -1 iron ions Chemical class 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 238000000926 separation method Methods 0.000 claims abstract description 6
- 238000004062 sedimentation Methods 0.000 claims abstract description 4
- 230000005284 excitation Effects 0.000 claims abstract description 3
- 238000006386 neutralization reaction Methods 0.000 claims description 11
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 7
- 239000011790 ferrous sulphate Substances 0.000 claims description 6
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 6
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 6
- 238000006555 catalytic reaction Methods 0.000 claims description 4
- 238000012668 chain scission Methods 0.000 claims description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 4
- 239000002957 persistent organic pollutant Substances 0.000 claims description 4
- 238000007142 ring opening reaction Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 239000010802 sludge Substances 0.000 abstract description 11
- 229910052742 iron Inorganic materials 0.000 abstract description 9
- 239000000126 substance Substances 0.000 abstract description 8
- 229960004887 ferric hydroxide Drugs 0.000 abstract description 3
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract 1
- 239000012028 Fenton's reagent Substances 0.000 description 7
- 239000003054 catalyst Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 150000002505 iron Chemical class 0.000 description 5
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 4
- 230000033558 biomineral tissue development Effects 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 4
- 238000004065 wastewater treatment Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000003421 catalytic decomposition reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000002779 inactivation Effects 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
- 230000000191 radiation effect Effects 0.000 description 2
- 239000011949 solid catalyst Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000005276 aerator Methods 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000149 chemical water pollutant Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910000358 iron sulfate Inorganic materials 0.000 description 1
- 229910021506 iron(II) hydroxide Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007540 photo-reduction reaction Methods 0.000 description 1
- 208000017983 photosensitivity disease Diseases 0.000 description 1
- 231100000434 photosensitization Toxicity 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
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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
- C02F1/30—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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- 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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
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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)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses a photo-Fenton process for treating refractory organic wastewater, which comprises the steps of firstly, automatically flowing raw water to a regulating tank to adjust the pH value to 3-5, and entering the regulating tank into a high-efficiency mixing tank; in the high-efficiency mixing tank, the medicament and the wastewater are fully mixed and enter an oxidation reaction zone under the action of rotational flow aeration stirring; uniformly mixing the medicament, the ferrous ions and H in the oxidation reaction zone2O2The chain reaction between the two is catalyzed to generate OH; most of ferrous ions are converted into ferric ions, and then a reflux system flows through the UV photocatalytic reactor; under the excitation of UV high-intensity light quantum, the ferric ions in the solution are converted into ferrous ions again, and then the solution returns to the second step for recycling; waste materialAnd (4) after the water is neutralized, the water enters a high-density sedimentation tank for solid-liquid separation, and finally the effluent reaches the standard and is discharged. By recycling the iron ions, the invention reduces the chemical sludge yield by 60-80% by taking the ferric hydroxide as the main component, thereby greatly reducing the medicament cost and the sludge treatment cost.
Description
Technical Field
The invention relates to the technical field of treatment of high-difficulty industrial wastewater, in particular to a photo-Fenton process for treating degradation-resistant organic wastewater.
Background
The fenton oxidation refers to a process that a fenton reagent (a homogeneous liquid system consisting of ferrous ions and hydrogen peroxide) generates hydroxyl radicals under an acidic condition, destroys an organic matter structure and finally oxidizes and decomposes the organic matter. The Fenton oxidation method is mainly suitable for treating wastewater containing refractory organic matters, such as wastewater of paper industry, dyeing and finishing industry, coal chemical industry, petrochemical industry, fine chemical industry, fermentation industry, landfill leachate and the like, wastewater of centralized wastewater treatment plants in industrial parks and the like. The Fenton oxidation wastewater treatment engineering process mainly comprises acid regulation, catalyst mixing, oxidation reaction, neutralization, solid-liquid separation, medicament dosing and a sludge treatment system.
The Fenton method is a homogeneous reaction, has high reaction rate and has application potential in a plurality of industrial wastewater treatment fields, but the defects of the technology limit the further popularization and application of the technology, such as:
(1) the Fenton process has low mineralization degree, and COD can not be further removed after reaching a certain removal rate.
(2) In Fenton Process H2O2The utilization rate of the mineral is not high, and organic matters cannot be mineralized fully;
(3) with Fe2+For catalyst H2O2Production of OH and OH-, but with a large amount of Fe (OH) sludge3Extra treatment is needed, and the cost of treatment cost is increased;
(4) catalyst Fe2+Will be converted during the reaction processIs Fe3+The traditional Fenton method cannot realize the recycling or reutilization of the catalyst, the consumption of iron salt is large, and the generation amount of iron mud is large.
(5) When the water quality and the water quantity fluctuate greatly, the Fenton technology is adopted to hardly ensure the stability to reach the standard, and when the H is used2O2When the addition amount and the proportion of the iron sulfate and the ferric iron are not controlled well or ferric iron is not precipitated, the wastewater is easy to turn color and is yellowish or brownish yellow.
(6) The existing stirring mode is single, the energy consumption is high by mechanical stirring, the equipment is easy to corrode, the conventional aeration disc is easy to block by aeration stirring, and the operation and maintenance workload is high.
Disclosure of Invention
In view of the above technical problems in the related art, the present invention provides a photo-fenton process for treating refractory organic wastewater, which can overcome the above disadvantages of the prior art methods.
In order to achieve the technical purpose, the technical scheme of the invention is realized as follows:
a photo-Fenton process for treating refractory organic wastewater comprises the following steps:
s1, lifting or automatically flowing the raw water to a regulating tank, adjusting the pH value to 3-5, and then entering a high-efficiency mixing tank;
s2, in the high-efficiency mixing tank, the medicament and the wastewater are fully mixed under the action of rotational flow aeration stirring to improve the mass transfer efficiency, and then enter an oxidation reaction zone;
s3, uniformly mixing the medicament in an oxidation reaction zone by adopting a multi-point feeding mode, wherein ferrous ions Fe in the oxidation reaction zone2+And H2O2OH, organic pollutants in the wastewater are subjected to chain scission and ring opening to form micromolecule organic matters or are directly mineralized into CO2And H2O to reduce the organic content;
s4-after the oxidation reaction is finished, most of ferrous ions Fe2+Has been converted into ferric ion Fe3+Flows through a UV photocatalytic reactor through a reflux system;
s5 exciting the UV high-intensity light quantum in the UV photocatalytic reactorFerric ion of (Fe)3+Reconverting into ferrous ion Fe2+Then returning to step S2 for reuse;
and S6, after repeated catalysis and oxidation reactions, the wastewater enters a high-density sedimentation tank for solid-liquid separation after being neutralized by a wastewater neutralization zone, and finally the effluent reaches the standard and is discharged.
Further, the efficient mixing tank, the oxidation reaction zone and the waste water neutralization zone are fully reacted in a rotational flow aeration stirring mode.
Further, in step S4, the reflux ratio of the reflux system is adjustable within a range of 50% -200%.
Furthermore, newly added ferrous sulfate and ferrous for recycling are mixed in the high-efficiency mixing tank, wherein the recycling rate of the ferrous sulfate is changed along with the dosage and the recycling amount of the UV photocatalytic reactor.
Furthermore, the UV photocatalytic reactor is arranged at the top or the side of the oxidation reaction tank and is dynamically connected with the oxidation reaction tank of the oxidation reaction zone through a water inlet pipeline and a return pipeline.
Furthermore, an online PH and online OPR monitoring system is arranged in each process of reaction, mixing and neutralization of raw water and is used for automatically adjusting the dosage and closed-loop control of the system.
Further, in step S5, the return water of the VU photocatalytic reactor is introduced from the end of the oxidation reaction zone and returned to the foremost end of the oxidation reaction zone or to a different reaction stage of the oxidation reaction zone.
The invention has the beneficial effects that: the problems of large consumption of ferric salt and large sludge generation amount in the Fenton reaction process are solved by introducing light into the Fenton reagent; by recycling the returned iron ions, the adding amount of the iron salt in the high-efficiency mixing tank is reduced by 60-80%, so that the yield of the chemical sludge taking the ferric hydroxide as the main component is correspondingly reduced by 60-80%, and the medicament cost and the sludge treatment cost are greatly reduced; by adopting a rotational flow aeration stirring mode, the anti-blocking and anti-scaling effects are achieved, the service life is long, and the operation and maintenance are simple; in addition, the whole process does not adopt any solid catalyst, so that the risks of catalyst loss, inactivation, blockage and the like are effectively avoided; meanwhile, the degree of mineralization of Fenton reaction is improved by utilizing the radiation effect of the medium-pressure ultraviolet lamp, the COD removal efficiency can be greatly improved, the reaction process is more stable, and the impact load resistance is strong.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic process flow diagram of a photo-Fenton process for treating refractory organic wastewater according to an embodiment of the present invention.
FIG. 2 is a plan view of a photo-Fenton process for treatment of refractory organic wastewater in parallel with 2 sets of wastewater treatment systems according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention belong to the protection scope of the present invention, and for the convenience of understanding the technical solutions of the present invention, the technical solutions of the present invention are described in detail below through specific use modes.
As shown in fig. 1, the photo-fenton process for treating refractory organic wastewater according to the embodiment of the present invention includes the following steps: firstly, raw water is lifted or automatically flows to a regulating tank, the PH value is adjusted to 3-5, and then the raw water enters a high-efficiency mixing tank;
s2, in the high-efficiency mixing tank, the medicament, the wastewater and the reflux are fully mixed under the action of rotational flow aeration stirring to improve the mass transfer efficiency and reduce the dosage of ferric salt, and then enter an oxidation reaction zone; the high-efficiency mixing tank is internally mixed with newly added ferrous sulfate and returned and recycled ferrous, wherein the returned and recycled rate of ferrous sulfate is changed along with the dosage and the returned quantity of the UV photocatalytic reactor.
Uniformly mixing the medicament in an oxidation reaction zone in a multi-point feeding mode, wherein ferrous ions Fe in the oxidation reaction zone2+And H2O2OH, organic pollutants in the wastewater are subjected to chain scission and ring opening to form micromolecule organic matters or are directly mineralized into CO2And H2O to reduce the organic content;
after the oxidation reaction is finished, most of ferrous ions Fe2+Has been converted into ferric ion Fe3+Flows through a UV photocatalytic reactor through a reflux system; in step S4, the reflux ratio of the reflux system is within an adjustable range of 50-200%; the UV photocatalytic reactor is arranged on the top or the side of the oxidation reaction tank and is dynamically connected with the oxidation reaction tank of the oxidation reaction zone through a water inlet pipeline and a return pipeline.
The defects of the common Fenton reagent, also called photo-Fenton, photo-assisted Fenton or UV-Fenton, can be overcome by introducing photo-UV into the Fenton reagent, but not simply combining the common Fenton with UV or H2O2, and the core lies in that under the excitation of UV high-intensity light quantum of the UV photocatalytic reactor, ferric iron ion Fe in the UV photocatalytic reactor3+Reconversion to ferrous ion Fe2+Photo-reduced produced Fe2+Is continued with H2O2Reaction, OH yield is increased, decomposition rate of organic matter is accelerated, and in addition, ultraviolet ray and Fe2+To H2O2Has a synergistic effect on the catalytic decomposition of (i) H2O2The decomposition rate is far greater than Fe2+Or ultraviolet catalysis H2O2Simple addition of the decomposition rates, on the one hand, of partial Fe under photocatalytic action3+Can be converted into Fe2+In addition, certain complexes of iron generate hydroxyl radicals under the action of ultraviolet light:
Fe3+ aq+ H2O2 + H2O +hV→Fe2+ aq + H3O+ + HO2 •-，
Fe(OH)2+ +hV→Fe2++·OH，
Fe(ROH)2+ +hV→Fe2++ H++·OR；
photo-reduction of produced Fe2+Is continued with H2O2The reaction increases the yield of OH, accelerates the decomposition of organic substances, and returns to step S2 for reuse, forming a closed cycle and control. Wherein, the reflux water of the VU photocatalytic reactor is introduced from the tail end of the oxidation reaction zone and reflows to the foremost end of the oxidation reaction zone or different reaction stages of the oxidation reaction zone.
After the catalytic reaction and the oxidation reaction are repeated, the wastewater enters a high-density sedimentation tank for solid-liquid separation after being neutralized by a wastewater neutralization zone, and finally the effluent reaches the standard and is discharged.
In addition, an online PH and online OPR monitoring system is arranged in each process of raw water reaction, mixing and neutralization and is used for automatically adjusting the dosage and the closed-loop control of the system. The high-efficiency mixing tank, the oxidation reaction zone and the wastewater neutralization zone are fully reacted in a rotational flow aeration stirring mode.
As shown in fig. 2, in the photo-fenton process system of the present application, the inlet water may be lifted by a lift pump or automatically flows into the system, and the outlet water may also be lifted by a lift pump or automatically flows, so that the system is suitable for actual elevation design of a project, and in practical application, the system may be a single treatment system, or 2 or more parallel systems may be used as shown in fig. 2 to treat organic wastewater.
In the flow of the traditional Fenton technology, the inlet water only passes through the treatment steps of regulating the pH value by a regulating tank, regulating the pH value by a mixing tank, regulating an oxidation reaction zone, a neutralization zone and solid-liquid separation, and finally the outlet water is discharged; according to the invention, the iron which is recycled through backflow is added into the mixing tank, so that the adding amount of iron salt is reduced, and the efficient and uniform mixing of the medicament is realized in each process in a rotational flow aeration stirring mode; and the organic pollutants in the sewage are subjected to chain scission, ring opening and the like to form micromolecular organic matters or are directly mineralized into CO2And H2O, reducing the content of organic matters; in the UV photocatalysisThrough special structural design in the reactor, overcome the difficult problem that the low luminousness of fenton reagent can influence ultraviolet ray penetrability.
In addition, the Photo-Fenton technology (Photo-Fenton) method is the most mature UV-Fenton method with the highest efficiency at present, organic matters can be partially degraded under the action of ultraviolet rays, and the degradation efficiency is higher because Fe is caused by the traditional Fenton method3+The accumulation of the substances can continuously initiate side reactions and hinder the forward reaction of the substances. Wherein, Fe3+And Fe2+The good circulation reaction can be kept, and the efficiency of the traditional Fenton reagent is improved; ultraviolet light and Fe2+To H2O2The synergistic effect of catalytic decomposition is mainly caused by that some hydroxyl complexes of iron can generate photo-sensitization reaction; the mineralization degree of organic matters can be more sufficient, the utilization rate of iron ions is greatly improved, and the repeated utilization rate of the iron ions reaches more than 60 percent; the addition amount of the ferric salt and the sludge yield are reduced compared with the traditional Fenton through the reflux recycling, so that the operation cost is saved; compared with the Fenton method, the method needs less chemical auxiliary agents, so the running cost is lower; the matched cyclone aerator is used as a bottom aeration stirring mode, so that the energy consumption is saved, and the stirring efficiency is improved.
In conclusion, by means of the technical scheme, the problems of large consumption of iron salt and large sludge generation amount in the Fenton reaction process are solved by introducing light into the Fenton reagent; by recycling the returned iron ions, the adding amount of the iron salt in the high-efficiency mixing tank is reduced by 60-80%, so that the yield of the chemical sludge taking the ferric hydroxide as the main component is correspondingly reduced by 60-80%, and the sludge treatment cost is greatly reduced; by adopting a rotational flow aeration stirring mode, the anti-blocking and anti-scaling effects are achieved, the service life is long, and the operation and maintenance are simple; in addition, the whole process does not adopt any solid catalyst, so that the risks of catalyst loss, inactivation, blockage and the like are effectively avoided; meanwhile, the degree of mineralization of Fenton reaction is improved by utilizing the radiation effect of the medium-pressure ultraviolet lamp, the COD removal efficiency can be greatly improved, the reaction process is more stable, and the impact load resistance is strong.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A photo-Fenton process for treating refractory organic wastewater is characterized by comprising the following steps of:
s1, lifting or automatically flowing the raw water to a regulating tank, adjusting the pH value to 3-5, and then entering a high-efficiency mixing tank;
s2, in the high-efficiency mixing tank, the medicament and the wastewater are fully mixed under the action of rotational flow aeration stirring to improve the mass transfer efficiency, and then enter an oxidation reaction zone;
s3, uniformly mixing the medicament in an oxidation reaction zone by adopting a multi-point feeding mode, wherein ferrous ions Fe in the oxidation reaction zone2+And H2O2OH, organic pollutants in the wastewater are subjected to chain scission and ring opening to form micromolecule organic matters or are directly mineralized into CO2And H2O to reduce the organic content;
s4-after the oxidation reaction is finished, most of ferrous ions Fe2+Has been converted into ferric ion Fe3+The wastewater passes through a UV photocatalytic reactor through a reflux system;
s5, under the excitation of UV high-intensity light quantum of the UV photocatalytic reactor, ferric iron ion Fe in the UV photocatalytic reactor3+Reconverting into ferrous ion Fe2+Then returning to step S2 for reuse;
and S6, after repeated catalysis and oxidation reactions, the wastewater enters a high-density sedimentation tank for solid-liquid separation after being neutralized by a wastewater neutralization zone, and finally the effluent reaches the standard and is discharged.
2. The photo-Fenton process for treatment of refractory organic wastewater according to claim 1, wherein the high efficiency mixing tank, the oxidation reaction zone and the wastewater neutralization zone are all fully reacted by means of rotational flow aeration stirring.
3. The photo-Fenton process according to claim 1, wherein in step S4, the reflux ratio of the reflux system is adjustable within the range of 50% -200%.
4. The photo-Fenton process for treatment of refractory organic wastewater according to claim 1, wherein new added ferrous sulfate and recycled ferrous iron are mixed in the high efficiency mixing tank, wherein the recycling rate of the ferrous sulfate is changed with the dosage and the recycling amount of the UV photo-catalytic reactor.
5. The photo-Fenton process for treatment of refractory organic wastewater according to claim 1, wherein the UV photo-catalytic reactor is disposed on the top or side of the oxidation reaction tank and is dynamically connected with the oxidation reaction tank of the oxidation reaction zone through a water inlet pipeline and a return pipeline.
6. The photo-Fenton process according to claim 1, wherein an on-line pH and OPR monitoring system is provided for the reaction, mixing and neutralization of raw water for automatic dosage adjustment and closed-loop control of the system.
7. The photo-Fenton process according to claim 1, wherein in step S5, the return water from the VU photocatalytic reactor is introduced from the end of the oxidation reaction zone and returned to the front end of the oxidation reaction zone or to a different reaction stage in the oxidation reaction zone.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114455671A (en) * | 2022-02-17 | 2022-05-10 | 广东工业大学 | High-value treatment method for drug wastewater |
| CN116675323A (en) * | 2023-07-03 | 2023-09-01 | 江苏省南京环境监测中心 | Light-mediated Fenton iron mud recycling process |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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