CN114956366A - Method for treating organic wastewater by combining catalytic wet oxidation and macroporous resin - Google Patents
Method for treating organic wastewater by combining catalytic wet oxidation and macroporous resin Download PDFInfo
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- CN114956366A CN114956366A CN202210361719.2A CN202210361719A CN114956366A CN 114956366 A CN114956366 A CN 114956366A CN 202210361719 A CN202210361719 A CN 202210361719A CN 114956366 A CN114956366 A CN 114956366A
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- 229920005989 resin Polymers 0.000 title claims abstract description 48
- 239000011347 resin Substances 0.000 title claims abstract description 48
- 239000002351 wastewater Substances 0.000 title claims abstract description 31
- 238000009279 wet oxidation reaction Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 16
- 239000003054 catalyst Substances 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000002253 acid Substances 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims description 30
- 238000006243 chemical reaction Methods 0.000 claims description 23
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 18
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 18
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 18
- 238000011001 backwashing Methods 0.000 claims description 14
- 239000000706 filtrate Substances 0.000 claims description 14
- 238000004132 cross linking Methods 0.000 claims description 9
- 229910000480 nickel oxide Inorganic materials 0.000 claims description 9
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims description 9
- 229910001404 rare earth metal oxide Inorganic materials 0.000 claims description 9
- 238000001179 sorption measurement Methods 0.000 claims description 9
- 239000004408 titanium dioxide Substances 0.000 claims description 9
- 239000011787 zinc oxide Substances 0.000 claims description 9
- 239000003957 anion exchange resin Substances 0.000 claims description 7
- 239000013522 chelant Substances 0.000 claims description 7
- 229920001429 chelating resin Polymers 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 239000011148 porous material Substances 0.000 claims description 7
- 125000001453 quaternary ammonium group Chemical group 0.000 claims description 7
- 229920006395 saturated elastomer Polymers 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- CHRJZRDFSQHIFI-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;styrene Chemical compound C=CC1=CC=CC=C1.C=CC1=CC=CC=C1C=C CHRJZRDFSQHIFI-UHFFFAOYSA-N 0.000 claims 1
- 208000028659 discharge Diseases 0.000 abstract 1
- 229920001577 copolymer Polymers 0.000 description 6
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 4
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 4
- 150000007524 organic acids Chemical class 0.000 description 4
- 235000005985 organic acids Nutrition 0.000 description 4
- 239000007800 oxidant agent Substances 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- 239000005711 Benzoic acid Substances 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 235000010233 benzoic acid Nutrition 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- LJRGBERXYNQPJI-UHFFFAOYSA-M sodium;3-nitrobenzenesulfonate Chemical compound [Na+].[O-][N+](=O)C1=CC=CC(S([O-])(=O)=O)=C1 LJRGBERXYNQPJI-UHFFFAOYSA-M 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 208000012839 conversion disease Diseases 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- XTVVROIMIGLXTD-UHFFFAOYSA-N copper(II) nitrate Chemical compound [Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O XTVVROIMIGLXTD-UHFFFAOYSA-N 0.000 description 1
- 239000006184 cosolvent Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000010525 oxidative degradation reaction Methods 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003756 stirring Methods 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
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/83—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with rare earths or actinides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/584—Recycling of catalysts
Abstract
The invention provides a method for treating organic wastewater by combining catalytic wet oxidation and macroporous resin, which can decompose general high-COD organic wastewater into micromolecular acid or micromolecular organic substances and remove the micromolecular organic substances by adopting mild conditions and deep treatment of the gel resin under a catalyst, wherein the COD removal rate reaches more than 97 percent, the COD of effluent water is less than 300mg/L, and the effluent water reaches the national secondary discharge standard.
Description
Technical Field
The invention belongs to the field of wastewater treatment, and particularly relates to a method for treating organic wastewater by combining catalytic wet oxidation and macroporous resin.
Background
The wet oxidation (CWAO) is to oxidize organic substances in water into small molecular organic substances or inorganic substances by using gaseous oxygen (or air) as an oxidant under the conditions of high temperature (120-320 ℃) and high pressure (0.5-20 MPa). Wet oxidation has been widely used in the environmental fields of industrial wastewater treatment, sludge treatment, and recovery of useful inorganic salts.
Chinese patent publication No. CN1289725A discloses a pretreatment method for extracting benzoic acid wastewater by complexing, which adopts a mixed solvent of complexing agent, cosolvent and diluent to perform multi-stage extraction on the benzoic acid wastewater at normal temperature until the chemical oxygen consumption value of raffinate reaches the discharge standard. The invention has high solvent cost, long treatment period and severe treatment environment.
Chinese patent publication No. CN100999355A discloses a method for catalytic wet oxidative degradation of sodium m-nitrobenzenesulfonate, which comprises adding sodium m-nitrobenzenesulfonate solution with a certain TOC concentration into a reaction kettle with a volume of 1L, sequentially adding hydrogen peroxide and oxygen as oxidants and copper nitrate as catalysts, and sealing; introducing oxygen with initial oxygen pressure of 0.1-15 MPa, stirring, heating to 150-300 deg.C for degradation, reacting for 0.5-2.5 hr, and cooling to obtain TOC removal rate of 96.51%. The method has higher treatment cost, hydrogen peroxide is used as an oxidant in the catalytic wet oxidation reaction, the risk in the wastewater treatment process is higher, and the copper introduced by the catalyst is easy to cause secondary pollution to the treated effluent.
Disclosure of Invention
In order to solve the technical problem, the invention provides a method for treating organic wastewater by combining catalytic wet oxidation and macroporous resin.
The technical scheme of the invention is as follows:
a method for treating organic wastewater by combining catalytic wet oxidation and macroporous resin comprises the following steps:
(1) carrying out wet oxidation on the organic wastewater under the conditions that the pressure is 1-7.5 MPa, the temperature is 150-250 ℃ and a catalyst exists, and filtering to obtain a filtrate I after the reaction is finished;
(2) adsorbing the filtrate I by chelating resin to recover the catalyst, and taking the water after adsorption as a solution II;
(3) adsorbing the catalyst by using chelate resin to obtain saturated backwash liquid III;
(4) enabling the solution II to flow through gel resin to adsorb micromolecular acid and organic matters, and yielding water to obtain a solution IV with COD (chemical oxygen demand) less than 300 mg/L;
(5) backwashing the gel resin by using a 5% NaOH solution to obtain a backwashing liquid V;
(6) combining the backwash liquids III and V, mixing the backwash liquids with the organic wastewater according to a certain proportion, and allowing the mixture to enter a reaction kettle for circular reaction.
In the method, the catalyst in the step (1) consists of the following components in parts by weight: 30-40 parts of titanium dioxide, 20-30 parts of activated carbon, 10-15 parts of zinc oxide, 5-7 parts of rare earth oxide and 8-12 parts of nickel oxide.
Preferably, the catalyst in the step (1) consists of the following components in parts by weight: 35 parts of titanium dioxide, 25 parts of activated carbon, 13 parts of zinc oxide, 6 parts of rare earth oxide and 10 parts of nickel oxide.
The gel resin in the steps (4) and (5) is anion exchange resin with quaternary ammonium group [ -N (CH3)3OH ] on styrene-divinylbenzene copolymer with 7% crosslinking degree.
The pore diameter of the gel resin in the steps (4) and (5) is less than 3 nm.
Preferably, the pressure in the step (1) is 3.5-7 MPa, and the temperature is 180-250 ℃.
The invention has the following beneficial effects: the invention relates to a method for treating organic wastewater by combining catalytic wet oxidation and macroporous resin, which adopts the combined catalyst to carry out catalytic wet oxidation to oxidize organic matters in water into micromolecular organic acids or organic matters, compared with the common catalyst, the oxidation is more thorough and efficient, the oxidation rate is high, the oxidation reaction time is short, then the cross-linking strong base resin is adopted for adsorption, the strong base group of the cross-linking strong base resin and the micromolecular acids generated by the wet oxidation reaction carry out complex reaction, so that the organic acids or the organic matters are separated from the water, meanwhile, as the diameter of the micromolecular organic acids or the organic matters is smaller than the aperture of the resin, the resin adsorbs the micromolecular organic acids or the organic matters through the absorption of the Van der Waals force among molecules, the reaction conversion rate and the adsorption rate are high, the invention can decompose the common high COD organic matter wastewater into the micromolecular acids or the micromolecular organic matters and remove the organic matters, the COD removal rate reaches more than 97 percent, the COD of the effluent reaches less than 300mg/L, and the effluent reaches the national second-level discharge standard.
Detailed Description
Example 1
The method for treating organic wastewater by combining catalytic wet oxidation and macroporous resin comprises the following steps:
(1) carrying out wet oxidation on the organic wastewater under the conditions that the pressure is 3.5MPa, the temperature is 180 ℃ and the catalyst exists, and filtering to obtain a filtrate I after the reaction is finished, wherein the catalyst consists of the following components in parts by weight: 30 parts of titanium dioxide, 20 parts of activated carbon, 15 parts of zinc oxide, 5 parts of rare earth oxide and 8 parts of nickel oxide;
(2) adsorbing the filtrate I by chelating resin to recover the catalyst, and taking the water after adsorption as a solution II;
(3) adsorbing the catalyst by using chelate resin to obtain saturated backwash liquid III;
(4) enabling the solution II to flow through gel resin to adsorb micromolecular acid and organic matters, wherein the gel resin is anion exchange resin with quaternary ammonium groups [ -N (CH3)3OH ] on a styrene-divinylbenzene copolymer with the crosslinking degree of 7%, the pore diameter is 2.5nm, and yielding water to obtain a solution IV with the COD of 280 mg/L;
(5) backwashing the gel resin by using a 5% NaOH solution to obtain a backwashing liquid V;
(6) combining the backwash liquid III and the backwash liquid V, mixing the backwash liquid III and the backwash liquid V with the organic wastewater according to a certain proportion, and allowing the mixture to enter a reaction kettle for circular reaction.
Example 2
The method for treating organic wastewater by combining catalytic wet oxidation and macroporous resin comprises the following steps:
(1) carrying out wet oxidation on organic wastewater under the conditions that the pressure is 5MPa, the temperature is 200 ℃ and a catalyst exists, and filtering to obtain a filtrate I after the reaction is finished, wherein the catalyst comprises the following components in parts by weight: 35 parts of titanium dioxide, 25 parts of activated carbon, 13 parts of zinc oxide, 6 parts of rare earth oxide and 10 parts of nickel oxide;
(2) adsorbing the filtrate I by chelating resin to recover the catalyst, and taking the water after adsorption as a solution II;
(3) adsorbing the catalyst by using chelate resin to obtain saturated backwash liquid III;
(4) enabling the solution II to flow through gel resin to adsorb micromolecular acid and organic matters, wherein the gel resin is anion exchange resin with quaternary ammonium groups [ -N (CH3)3OH ] on a styrene-divinylbenzene copolymer with the crosslinking degree of 7%, the pore diameter is 2nm, and yielding water to obtain a solution IV with the COD of 250 mg/L;
(5) backwashing the gel resin by using a 5% NaOH solution to obtain a backwashing liquid V;
(6) combining the backwash liquids III and V, mixing the backwash liquids with the organic wastewater according to a certain proportion, and allowing the mixture to enter a reaction kettle for circular reaction.
Example 3
The method for treating organic wastewater by combining catalytic wet oxidation and macroporous resin comprises the following steps:
(1) carrying out wet oxidation on the organic wastewater under the conditions that the pressure is 6MPa, the temperature is 220 ℃ and a catalyst exists, and filtering to obtain a filtrate I after the reaction is finished, wherein the catalyst comprises the following components in parts by weight: 30 parts of titanium dioxide, 25 parts of activated carbon, 15 parts of zinc oxide, 7 parts of rare earth oxide and 10 parts of nickel oxide;
(2) adsorbing the filtrate I by chelating resin to recover the catalyst, and taking the water after adsorption as a solution II;
(3) adsorbing the catalyst by using chelate resin to obtain saturated backwash liquid III;
(4) enabling the solution II to flow through gel resin to adsorb micromolecular acid and organic matters, wherein the gel resin is anion exchange resin with quaternary ammonium groups [ -N (CH3)3OH ] on a styrene-divinylbenzene copolymer with the crosslinking degree of 7%, the pore diameter is 2.2nm, and yielding water to obtain a solution IV with the COD of 275 mg/L;
(5) backwashing the gel resin by using a 5% NaOH solution to obtain a backwashing liquid V;
(6) combining the backwash liquids III and V, mixing the backwash liquids with the organic wastewater according to a certain proportion, and allowing the mixture to enter a reaction kettle for circular reaction.
Example 4
The method for treating organic wastewater by combining catalytic wet oxidation and macroporous resin comprises the following steps:
(1) carrying out wet oxidation on the organic wastewater under the conditions that the pressure is 4MPa, the temperature is 230 ℃ and a catalyst exists, and filtering to obtain a filtrate I after the reaction is finished, wherein the catalyst comprises the following components in parts by weight: 40 parts of titanium dioxide, 25 parts of activated carbon, 12 parts of zinc oxide, 6 parts of rare earth oxide and 8 parts of nickel oxide;
(2) adsorbing the filtrate I by chelating resin to recover the catalyst, and taking the water after adsorption as a solution II;
(3) adsorbing the catalyst by using chelate resin to obtain saturated backwash liquid III;
(4) enabling the solution II to flow through gel resin to adsorb micromolecular acid and organic matters, wherein the gel resin is anion exchange resin with quaternary ammonium groups [ -N (CH3)3OH ] on a styrene-divinylbenzene copolymer with the crosslinking degree of 7%, the pore diameter is 1.8nm, and yielding water to obtain a solution IV with the COD of 295 mg/L;
(5) backwashing the gel resin by using a 5% NaOH solution to obtain a backwashing liquid V;
(6) combining the backwash liquids III and V, mixing the backwash liquids with the organic wastewater according to a certain proportion, and allowing the mixture to enter a reaction kettle for circular reaction.
Example 5
The method for treating organic wastewater by combining catalytic wet oxidation and macroporous resin comprises the following steps:
(1) carrying out wet oxidation on the organic wastewater under the conditions that the pressure is 7MPa, the temperature is 250 ℃ and a catalyst exists, and filtering to obtain a filtrate I after the reaction is finished, wherein the catalyst comprises the following components in parts by weight: 33 parts of titanium dioxide, 20 parts of activated carbon, 10 parts of zinc oxide, 5 parts of rare earth oxide and 10 parts of nickel oxide;
(2) adsorbing the filtrate I by chelating resin to recover the catalyst, and taking the water after adsorption as a solution II;
(3) adsorbing the catalyst by using chelate resin to obtain saturated backwash liquid III;
(4) enabling the solution II to flow through gel resin to adsorb micromolecular acid and organic matters, wherein the gel resin is anion exchange resin with quaternary ammonium groups [ -N (CH3)3OH ] on a styrene-divinylbenzene copolymer with the crosslinking degree of 7%, the pore diameter is 2nm, and yielding water to obtain a solution IV with the COD of 260 mg/L;
(5) backwashing the gel resin by using a 5% NaOH solution to obtain a backwashing liquid V;
(6) combining the backwash liquids III and V, mixing the backwash liquids with the organic wastewater according to a certain proportion, and allowing the mixture to enter a reaction kettle for circular reaction.
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 and improvements made within the spirit and principle of the present invention are included in the scope of the present invention.
Claims (6)
1. A method for treating organic wastewater by combining catalytic wet oxidation and macroporous resin is characterized by comprising the following steps:
carrying out wet oxidation on the organic wastewater under the conditions that the pressure is 1-7.5 MPa, the temperature is 150-250 ℃ and a catalyst exists, and filtering to obtain a filtrate I after the reaction is finished;
(2) adsorbing the filtrate I by chelating resin to recover the catalyst, and taking the water after adsorption as a solution II;
(3) adsorbing a catalyst by using chelate resin to obtain saturated backwash liquid III;
(4) enabling the solution II to flow through gel resin to adsorb micromolecular acid and organic matters, and yielding water to obtain a solution IV with COD (chemical oxygen demand) less than 300 mg/L;
(5) backwashing the gel resin by using a 5% NaOH solution to obtain a backwashing liquid V;
(6) combining the backwash liquids III and V, mixing the backwash liquids with the organic wastewater according to a certain proportion, and allowing the mixture to enter a reaction kettle for circular reaction.
2. The process of claim 1, wherein the catalyst in step (1) comprises the following components in parts by weight: 30-40 parts of titanium dioxide, 20-30 parts of activated carbon, 10-15 parts of zinc oxide, 5-7 parts of rare earth oxide and 8-12 parts of nickel oxide.
3. The process of claim 1, wherein the catalyst in step (1) comprises the following components in parts by weight: 35 parts of titanium dioxide, 25 parts of activated carbon, 13 parts of zinc oxide, 6 parts of rare earth oxide and 10 parts of nickel oxide.
4. The method of claim 1, wherein the gel resin in steps (4) and (5) is an anion exchange resin having quaternary ammonium groups [ -N (CH3)3OH ] on a styrene-divinylbenzene interpolymer having a degree of crosslinking of 7%.
5. The method of claim 1, wherein the gel resin in steps (4) and (5) has a pore size of less than 3 nm.
6. The method according to claim 1, wherein the pressure in step (1) is 3.5 to 7MPa and the temperature is 180 to 250 ℃.
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| CN202210361719.2A CN114956366A (en) | 2022-04-07 | 2022-04-07 | Method for treating organic wastewater by combining catalytic wet oxidation and macroporous resin |
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-
2022
- 2022-04-07 CN CN202210361719.2A patent/CN114956366A/en active Pending
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| CN106336085A (en) * | 2016-10-27 | 2017-01-18 | 浙江奇彩环境科技股份有限公司 | Caffeine wastewater purification treatment process |
| CN108503116A (en) * | 2018-04-11 | 2018-09-07 | 中国科学院过程工程研究所 | A kind of system and method for high concentrated organic wastewater recycling |
| CN111377523A (en) * | 2018-12-28 | 2020-07-07 | 中国石油化工股份有限公司 | Catalytic wet oxidation treatment method for organic wastewater |
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