CN117466377A - Method for directionally removing refractory organic pollutants in water - Google Patents
Method for directionally removing refractory organic pollutants in water Download PDFInfo
- Publication number
- CN117466377A CN117466377A CN202311598182.2A CN202311598182A CN117466377A CN 117466377 A CN117466377 A CN 117466377A CN 202311598182 A CN202311598182 A CN 202311598182A CN 117466377 A CN117466377 A CN 117466377A
- Authority
- CN
- China
- Prior art keywords
- organic
- wavelength
- solution
- water
- led lamp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002957 persistent organic pollutant Substances 0.000 title claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000003756 stirring Methods 0.000 claims abstract description 17
- 239000000356 contaminant Substances 0.000 claims description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 17
- 239000002351 wastewater Substances 0.000 claims description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 230000000593 degrading effect Effects 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 239000004753 textile Substances 0.000 claims description 2
- 230000015556 catabolic process Effects 0.000 abstract description 35
- 238000006731 degradation reaction Methods 0.000 abstract description 35
- 238000010521 absorption reaction Methods 0.000 abstract description 14
- 230000001678 irradiating effect Effects 0.000 abstract description 14
- 239000005416 organic matter Substances 0.000 abstract description 10
- 150000003254 radicals Chemical class 0.000 abstract description 10
- 238000006303 photolysis reaction Methods 0.000 abstract description 5
- 230000015843 photosynthesis, light reaction Effects 0.000 abstract description 5
- 239000003814 drug Substances 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 3
- 238000001782 photodegradation Methods 0.000 abstract description 2
- 230000005855 radiation Effects 0.000 abstract 1
- ZHNUHDYFZUAESO-UHFFFAOYSA-N Formamide Chemical compound NC=O ZHNUHDYFZUAESO-UHFFFAOYSA-N 0.000 description 32
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 25
- AYIRNRDRBQJXIF-NXEZZACHSA-N (-)-Florfenicol Chemical compound CS(=O)(=O)C1=CC=C([C@@H](O)[C@@H](CF)NC(=O)C(Cl)Cl)C=C1 AYIRNRDRBQJXIF-NXEZZACHSA-N 0.000 description 13
- 229960003760 florfenicol Drugs 0.000 description 13
- 239000010453 quartz Substances 0.000 description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 230000033558 biomineral tissue development Effects 0.000 description 9
- 239000000376 reactant Substances 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical class OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 7
- LINPIYWFGCPVIE-UHFFFAOYSA-N 2,4,6-trichlorophenol Chemical compound OC1=C(Cl)C=C(Cl)C=C1Cl LINPIYWFGCPVIE-UHFFFAOYSA-N 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 238000012546 transfer Methods 0.000 description 6
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 5
- 230000001590 oxidative effect Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- CAWXEEYDBZRFPE-UHFFFAOYSA-N Hexazinone Chemical compound O=C1N(C)C(N(C)C)=NC(=O)N1C1CCCCC1 CAWXEEYDBZRFPE-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 229910052753 mercury Inorganic materials 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 239000003242 anti bacterial agent Substances 0.000 description 3
- 229940088710 antibiotic agent Drugs 0.000 description 3
- 239000000575 pesticide Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000010918 textile wastewater Substances 0.000 description 3
- 238000006552 photochemical reaction Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000000862 absorption spectrum Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005183 environmental health Effects 0.000 description 1
- 238000004128 high performance liquid chromatography Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- -1 hydroxyl radicals Chemical class 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 230000007704 transition 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
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
Abstract
The invention belongs to the technical field of photodegradation of organic pollutants in water, and particularly relates to a method for directionally removing refractory organic pollutants in water. The method comprises the steps of firstly determining the maximum absorption wavelength of an organic pollutant solution, then introducing the organic pollutant solution into a UV photolysis processor, finally starting a UV-LED lamp, adjusting the wavelength of a light source according to the maximum absorption wavelength, and synchronously irradiating and stirring to obtain the ultraviolet radiation organic pollutant solution. The invention utilizes UV-LED of ultraviolet light of 200-320nm and 185nm to carry on the direct photolysis to the difficult degradation organic matter absorbed in 200-320nm wavelength range, and for the difficult degradation organic matter not absorbed in 200-320nm of wavelength, can directly photodecompose water to produce the reducing free radical by ultraviolet light of 185nm wavelength, used for the advanced reduction degradation of the above-mentioned organic matter, has increased the organic species of degradation, and the invention does not need extra medicament, the cost is cheap, green, suitable for popularizing and applying on a large scale.
Description
Technical Field
The invention belongs to the technical field of photodegradation of organic pollutants in water, and particularly relates to a method for directionally removing refractory organic pollutants in water.
Background
The treatment of hardly degradable organic substances is generally mainly carried out by oxidation, and advanced oxidation is carried out by using radicals having a strong oxidizing ability, such as hydroxyl radicals (. OH) and the like. The free radical with strong oxidability can oxidatively degrade the organic matters with toxicity and difficult degradation into low-toxicity or nontoxic small molecular substances. Although the advanced oxidation method can remove refractory organic matters in the water body, the oxidative free radicals with high oxidation potential can react with common coexisting organic matters in the water body in a non-selective way, and the side reactions not only can compete for consuming the oxidative free radicals for removing pollutants, but also can generate toxic byproducts.
The organic matter can absorb photon energy, electrons in a bonding orbit and a non-bonding orbit are possibly excited into a counter-bonding orbit to become excited molecules, most organic photoreaction is carried out through n- & gt pi-pi transition, the corresponding absorption wavelength is respectively in a visible light region and an ultraviolet light region, the precondition of the photochemical reaction of the organic matter is that the absorption spectrum of the organic matter is suitable for the spectrum of absorbed light, and the direct photolysis of the organic matter by ultraviolet light (UV) is determined to be a targeted treatment process. The light source used to emit UV is typically a mercury vapor lamp, which has many drawbacks in engineering applications, for example, the use and disposal of mercury lamps may lead to the release of mercury into the environment, constituting a risk to human and environmental health. In addition, the variety of refractory organic matters in the water body is various, the optimal absorption wavelength of each organic matter is different, but the wavelength of the mercury lamp is fixed, and the requirement of wavelength adjustment to degrade different organic matters cannot be met in the actual treatment process.
Ultraviolet light emitting diodes (UV-LEDs) have various advantages including mercury free and energy efficient, compact size (no dedicated circuitry), fast start-up time and long lifetime, but most importantly UV-LEDs can adjust the wavelength of the emitted UV light to better selectively degrade certain refractory organics. The Chinese patent No. 114853116A discloses a method for treating the hexazinone pesticide wastewater by using UV-LED dual-wavelength activated hydrogen peroxide, which is carried out by adopting a processor with a UV-LED lamp arranged on the side wall, introducing the hexazinone pesticide wastewater into the processor, adding hydrogen peroxide to enable the concentration of the hexazinone pesticide wastewater to reach 4-8mM, starting the UV-LED lamp, irradiating the wastewater by using the UV-LED lamp to enable the hydrogen peroxide to generate hydroxyl free radicals, and oxidizing the hexazinone in the water, wherein the transportation and storage of the hydrogen peroxide as a strong oxidant are very severe, thereby causing additional expense, and the treatment cost is increased by using additional reagents. Another chinese patent CN113651390a discloses a photochemical reaction device for treating wastewater containing antibiotics by using UV-LED, which uses LED lamp beads with wavelength of 275nm to directly irradiate the wastewater containing antibiotics, and the method does not add additional medicines, and has the advantages of green and low cost, but using only 275nm UV light can cause few kinds of antibiotics capable of degrading, and more likely to cause the pollutants in the wastewater not to be degraded completely.
Therefore, a treatment process with strong selectivity, high efficiency and low cost is needed for degradation of refractory organic matters. The UV-LED lamp can adjust the emission wavelength in real time according to the maximum absorption wavelength of the target organic pollutants, so that the target organic matters are degraded under the maximum absorption wavelength, the maximum efficiency is exerted, and the directional removal of more refractory organic pollutants is realized. Meanwhile, for organic pollutants with the maximum absorption wavelength not in the emission wavelength range of the UV-LED lamp, 185nm vacuum ultraviolet light can be adopted to directly photolyze water in an alkaline anoxic environment to generate reducing free radicals, such as H.and e aq - The reducing free radicals can exist more stably and have higher yield under the alkaline anoxic environment, the pollutants are more easily degraded, the free radicals can attack the C-C bond and the C-X bond of the refractory organic matters to degrade the refractory organic matters, and the degradation types of the pollutants can be increased.
Disclosure of Invention
The invention provides a method for directionally removing organic pollutants difficult to degrade in water, aiming at the problems existing in the prior art.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a method for directionally removing refractory organic pollutants in water comprises the steps of determining the wavelength of a solution for degrading the organic pollutants, and synchronously carrying out UV-LED lamp irradiation and stirring.
Preferably, when the wavelength of the organic contaminant solution is not in the range of 200-320nm, the wavelength of the UV-LED lamp is adjusted to 185nm.
Preferably, the organic contaminants originate from wastewater produced by the medical, paper or textile industry, and the wavelength is determined by full-band scanning with an ultraviolet spectrophotometer.
Preferably, the concentration of the organic contaminant is 4-100mg/L.
Preferably, the temperature of the organic contaminant solution is 20-30 ℃.
Preferably, after determining the wavelength for degrading the organic pollutant solution, the organic pollutant solution is introduced into the processor and nitrogen is introduced, and the time for introducing the nitrogen is 20-30min.
Preferably, the power of the UV-LED lamp is 5-30W.
Preferably, the irradiation time is 3-30min.
Preferably, the rotational speed of the stirring is 500-1000rpm.
Preferably, when the wavelength of the UV-LED lamp is adjusted to 185nm, the pH value of the organic pollutant solution is adjusted to 8-10, and the concentration of dissolved oxygen is less than or equal to 1mg/L.
The invention also provides application of the method in degrading organic pollutants in water.
Compared with the prior art, the invention has the following beneficial effects:
(1) The in-situ photolysis technology adopted by the invention does not need extra medicament, can utilize the absorption wavelength of the refractory organic matters to carry out direct photolysis, maximizes the utilization rate of ultraviolet light, simultaneously avoids secondary pollution of the medicament, and has the advantages of low cost and environmental protection.
(2) The invention utilizes the UV-LED of ultraviolet light with the wavelength of 200-320nm to directly photolyze the organic matters which are difficult to degrade and are absorbed in the wavelength range, greatly increases the organic matters which are difficult to degrade, and can directly photolyze water to generate reducing free radicals by ultraviolet light with the wavelength of 185nm for the organic matters which are difficult to degrade and are absorbed in the wavelength range of not 200-320nm, comprising e aq - H.its standard reduction potential is-2.9V and-2.3V respectively reflects its reduction capacity.
Drawings
FIG. 1 is a graph showing degradation rate of 2,4, 6-Trichlorophenol (TCP) which is an organic pollutant in example 1.
FIG. 2 is a graph of the degradation rate of Florfenicol (FLO), an organic contaminant in example 2.
FIG. 3 is a graph showing the degradation rate of formamide as an organic pollutant in example 3.
FIG. 4 is a graph showing degradation rate of N, N-dimethylformamide as an organic contaminant in example 4.
FIG. 5 is a graph showing the degradation rate of formamide as an organic pollutant in comparative example 1.
FIG. 6 is a graph showing degradation rate of 2,4, 6-Trichlorophenol (TCP) which is an organic pollutant in comparative example 2.
Detailed Description
It is worth noting that the raw materials used in the invention are all common commercial products.
Example 1
Taking the degradation of the common refractory organic matter 2,4, 6-Trichlorophenol (TCP) in papermaking wastewater as an example.
A method for directionally removing refractory organic pollutants in water comprises the following steps:
(1) The 2,4, 6-Trichlorophenol (TCP) solution was scanned across the full band by an ultraviolet spectrophotometer and found to have a maximum absorption wavelength at 202 nm.
(2) An initial concentration of 48.63mg/L of 2,4, 6-Trichlorophenol (TCP) solution was placed in a 500mL quartz cylinder apparatus, nitrogen was introduced for 30 minutes, and the temperature of the reaction solution was controlled at 25℃using a constant temperature circulator.
(3) And (3) taking a UV-LED capable of emitting ultraviolet light with the wavelength of 200-320nm as a light source, setting the power of the UV-LED lamp to be 20W, spirally attaching the UV-LED lamp belt on the wall of the quartz cylinder device from top to bottom, adjusting the wavelength to be 202nm, adopting a magnetic stirrer at the bottom of the reactor to improve the mass transfer efficiency between reactants and reaction substances, setting the stirring rotating speed to be 800rpm, synchronously irradiating and stirring, and irradiating for 14.5min by using the light source.
Example 2
Taking the degradation of Florfenicol (FLO) which is a common refractory organic matter in medical wastewater as an example,
a method for directionally removing refractory organic pollutants in water comprises the following steps:
(1) The Florfenicol (FLO) solution was scanned across the full band by an ultraviolet spectrophotometer and found to have a maximum absorption wavelength at 223 nm.
(2) The initial concentration of 3.64mg/L Florfenicol (FLO) solution was placed in a 500mL quartz cylinder apparatus, nitrogen was introduced for 30min, and the temperature of the reaction solution was controlled at 25℃using a constant temperature circulator.
(3) And (3) taking a UV-LED capable of emitting ultraviolet light with the wavelength of 200-320nm as a light source, setting the power of the UV-LED lamp to be 5W, spirally attaching the UV-LED lamp belt on the wall of the quartz cylinder device from top to bottom, adjusting the wavelength to be 223nm, adopting a magnetic stirrer at the bottom of the reactor to improve the mass transfer efficiency between reactants and reaction substances, setting the stirring rotating speed to be 500rpm, synchronously irradiating and stirring, and irradiating for 3min by using the light source.
Example 3
Taking the degradation of common nondegradable organic substance formamide in textile wastewater as an example,
a method for directionally removing refractory organic pollutants in water comprises the following steps:
(1) The formamide solution was scanned across the full band by an ultraviolet spectrophotometer and found to have a maximum absorption wavelength at 190 nm.
(2) The formamide solution with the initial concentration of 20.53mg/L is placed in a quartz cylinder device with the capacity of 500mL, the pH value of the formamide solution is regulated to be 8 by adopting sulfuric acid and sodium hydroxide, nitrogen is introduced for 30min, the concentration of dissolved oxygen is measured to be less than or equal to 1mg/L by an oxygen dissolving instrument, and the temperature of the reaction solution is controlled to be 20 ℃ by using a constant temperature circulator.
(3) And (3) taking a UV-LED capable of emitting ultraviolet light with the wavelength of 200-320nm as a light source, setting the power of the UV-LED lamp to be 10W, spirally attaching the UV-LED lamp belt on the wall of the quartz cylinder device from top to bottom, adjusting the wavelength to be 185nm, adopting a magnetic stirrer at the bottom of the reactor to improve the mass transfer efficiency between the reactant and the reactant, setting the stirring rotating speed to be 1000rpm, synchronously irradiating and stirring, and irradiating for 20min by using the light source.
Example 4
Taking degradation of common nondegradable organic matters N, N-dimethylformamide in textile wastewater as an example,
a method for directionally removing refractory organic pollutants in water comprises the following steps:
(1) The N, N-dimethylformamide solution was subjected to full-band scanning by an ultraviolet spectrophotometer, and the maximum absorption wavelength was found to be at 197 nm.
(2) The N, N-dimethylformamide solution with the initial concentration of 98.6mg/L is placed in a quartz cylinder device with the capacity of 500mL, the pH value of the N, N-dimethylformamide solution is regulated to be 10 by adopting sulfuric acid and sodium hydroxide, nitrogen is introduced for 20min, the concentration of dissolved oxygen is measured to be less than or equal to 1mg/L by an oxygen dissolving instrument, and the temperature of the reaction solution is controlled to be 30 ℃ by using a constant-temperature circulator.
(3) And (3) taking a UV-LED capable of emitting ultraviolet light with the wavelength of 200-320nm as a light source, setting the power of the UV-LED lamp to be 30W, spirally attaching the UV-LED lamp belt on the wall of the quartz cylinder device from top to bottom, adjusting the wavelength to 185nm, adopting a magnetic stirrer at the bottom of the reactor to improve the mass transfer efficiency between the reactant and the reactant, setting the stirring rotating speed to be 800rpm, synchronously irradiating and stirring, and irradiating for 31.5min by using the light source.
Comparative example 1
Taking the degradation of common nondegradable organic substance formamide in textile wastewater as an example,
a method for directionally removing refractory organic pollutants in water comprises the following steps:
(1) The formamide solution was scanned across the full band by an ultraviolet spectrophotometer and found to have a maximum absorption wavelength at 190 nm.
(2) The formamide solution with the initial concentration of 20.53mg/L is placed in a quartz cylinder device with the capacity of 500mL, the pH=8 of the reaction solution is adjusted by adopting sulfuric acid and sodium hydroxide, nitrogen is introduced for 30min, the concentration of dissolved oxygen is measured to be less than or equal to 1mg/L by an oxygen dissolving instrument, and the temperature of the reaction solution is controlled to be 20 ℃ by using a constant temperature circulator.
(3) And (3) taking a UV-LED capable of emitting ultraviolet light with the wavelength of 200-320nm as a light source, setting the power of the UV-LED lamp to be 10W, spirally attaching the UV-LED lamp belt on the wall of the quartz cylinder device from top to bottom, adjusting the wavelength to be 300nm, adopting a magnetic stirrer at the bottom of the reactor to improve the mass transfer efficiency between reactants and reaction substances, setting the stirring rotating speed to be 1000rpm, synchronously irradiating and stirring, and irradiating for 31.5min by using the light source.
Comparative example 2
Taking the degradation of the common refractory organic TCP in the papermaking wastewater as an example,
a method for directionally removing refractory organic pollutants in water comprises the following steps:
(1) The TCP solution was scanned across the full band by an ultraviolet spectrophotometer and found to have a maximum absorption wavelength at 202 nm.
(2) The TCP solution having an initial concentration of 48.63mg/L was placed in a quartz cylinder apparatus having a capacity of 500mL, nitrogen gas was introduced for 30 minutes, and the temperature of the reaction solution was controlled at 25℃by using a constant temperature circulator.
(3) The method comprises the steps of taking a UV-LED capable of emitting ultraviolet light with the wavelength of 200-320nm as a light source, setting the power of a UV-LED lamp to be 20W, spirally attaching a UV-LED lamp belt to the wall of a quartz cylinder device from top to bottom, spirally attaching the UV-LED lamp belt to the wall of the quartz cylinder device from top to bottom, adjusting the wavelength to 300nm, adopting a magnetic stirrer at the bottom of a reactor to improve the mass transfer efficiency between reactants and reaction substances, setting the stirring rotation speed to be 800rpm, synchronously irradiating and stirring, and irradiating for 29.5min by using the light source.
Test case
The degradation rate of the organic contaminants 2,4, 6-Trichlorophenol (TCP), florfenicol (FLO), formamide, N-dimethylformamide and formamide and the total mineralization rate of the system were determined by High Performance Liquid Chromatography (HPLC) and Total Organic Carbon (TOC) analyzer (TOC-L CPH).
The degradation rate is calculated as follows:
degradation rate = (total concentration of contaminants before treatment-total concentration of contaminants after treatment)/total concentration of contaminants before treatment×100%
The calculation formula of the total mineralization rate of the system is as follows:
total mineralization = (total organic carbon before treatment-total organic carbon after treatment)/total organic carbon before treatment × 100%
The degradation rate of organic pollutant TCP in example 1 is shown in FIG. 1. As can be seen from FIG. 1, the TCP in the water body is almost completely degraded at 14.5min, the degradation rate of the TCP after the treatment is measured to be 98.64%, and the total mineralization rate is measured to be 12.69%.
The degradation rate of organic pollutant FLO in example 2 is shown in fig. 2. As can be seen from FIG. 2, at 3.0min, the FLO in the water body is almost completely degraded, the degradation rate of the FLO in the treated water body is 99.41% and the total mineralization rate is 13.54%.
The degradation rate of formamide as an organic pollutant in example 3 is shown in fig. 3. As can be seen from FIG. 3, the formamide in the water body is almost completely degraded at 20min, the degradation rate of the formamide in the treated water body reaches 97.8% after measurement, and the total mineralization rate reaches 10.62%.
The degradation rate of N, N-dimethylformamide as an organic contaminant in example 4 is shown in FIG. 4. As can be seen from FIG. 4, the degradation rate of N, N-dimethylformamide in the water body is almost complete at 30min, the degradation rate of N, N-dimethylformamide in the water body after treatment is measured to be 96.7%, and the total mineralization rate is 9.86%.
The degradation rate of the organic contaminant formamide in comparative example 1 is shown in fig. 5. As can be seen from FIG. 5, the degradation rate of formamide in the treated water body is 32.7%, and the total mineralization rate is 6.54%.
The degradation rate of organic contaminant TCP in comparative example 2 is shown in FIG. 6. From fig. 6, it can be seen that the degradation rate of TCP after treatment is 42.4%, and the total mineralization rate is 3.56%.
Finally, it should be noted that the above description is only for illustrating the technical solution of the present invention, and not for limiting the scope of the present invention, and that the simple modification and equivalent substitution of the technical solution of the present invention can be made by those skilled in the art without departing from the spirit and scope of the technical solution of the present invention.
Claims (10)
1. A method for directionally removing refractory organic pollutants in water is characterized by comprising the steps of determining the wavelength of a solution for degrading the organic pollutants, and synchronously carrying out UV-LED lamp irradiation and stirring, wherein when the wavelength of the solution for degrading the organic pollutants is not in the range of 200-320nm, the wavelength of the UV-LED lamp is adjusted to 185nm.
2. The method of claim 1, wherein the organic contaminant is derived from wastewater produced by a medical, paper or textile industry, and the wavelength is determined by full-band scanning with an ultraviolet spectrophotometer.
3. The method of claim 1, wherein the concentration of the organic contaminant is 4-100mg/L.
4. The method of claim 1, wherein the temperature of the organic contaminant solution is 20-30 ℃.
5. The method of any one of claims 1-4, wherein after determining the wavelength of degrading the organic contaminant solution, the organic contaminant solution is introduced into the processor and nitrogen is introduced for 20-30 minutes.
6. The method of claim 1, wherein the UV-LED lamp has a power of 5-30W.
7. The method of claim 1, wherein the irradiation is for a period of 3-30 minutes.
8. The method of claim 1, wherein the rotational speed of the stirring is 500-1000rpm.
9. The method according to claim 1, wherein when the wavelength of the UV-LED lamp is adjusted to 185nm, the pH of the organic pollutant solution is adjusted to 8-10 and the concentration of dissolved oxygen is less than or equal to 1mg/L.
10. Use of a method according to any one of claims 1-9 for degrading organic contaminants in water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311598182.2A CN117466377A (en) | 2023-11-27 | 2023-11-27 | Method for directionally removing refractory organic pollutants in water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311598182.2A CN117466377A (en) | 2023-11-27 | 2023-11-27 | Method for directionally removing refractory organic pollutants in water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117466377A true CN117466377A (en) | 2024-01-30 |
Family
ID=89623959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311598182.2A Pending CN117466377A (en) | 2023-11-27 | 2023-11-27 | Method for directionally removing refractory organic pollutants in water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117466377A (en) |
-
2023
- 2023-11-27 CN CN202311598182.2A patent/CN117466377A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Darsinou et al. | Sono-activated persulfate oxidation of bisphenol A: kinetics, pathways and the controversial role of temperature | |
| Almomani et al. | Potential use of solar photocatalytic oxidation in removing emerging pharmaceuticals from wastewater: A pilot plant study | |
| Rosenfeldt et al. | Comparison of the efficiency of OH radical formation during ozonation and the advanced oxidation processes O3/H2O2 and UV/H2O2 | |
| Zhang et al. | Decolorization of methyl orange by ozonation in combination with ultrasonic irradiation | |
| Kritikos et al. | Photocatalytic degradation of reactive black 5 in aqueous solutions: Effect of operating conditions and coupling with ultrasound irradiation | |
| Sharma et al. | Studies on degradation of reactive red 135 dye in wastewater using ozone | |
| Heit et al. | VUV-photolysis of aqueous systems: spatial differentiation between volumes of primary and secondary reactions | |
| Gomez et al. | Photodegradation of 4-chlorophenol using XeBr, KrCl and Cl2 barrier-discharge excilamps: A comparative study | |
| Lü et al. | Degradation of methyl orange by UV, O 3 and UV/O 3 systems: analysis of the degradation effects and mineralization mechanism | |
| Torres et al. | Sequential helio-photo-Fenton and sonication processes for the treatment of bisphenol A | |
| KR20150120255A (en) | Treating method of waste water | |
| Wu et al. | The oxidation study of 2-propanol using ozone-based advanced oxidation processes | |
| CN113415869A (en) | Method for synergistically degrading refractory organic matters in town sewage by using hydrogen peroxide component in low-concentration peroxyacetic acid | |
| Zheng et al. | Degradation of methyl mercaptan by a microwave-induced photoreaction process | |
| Assadi et al. | COMPARISON OF PHENOL PHOTODEGRADATION BY UV/H 2 O 2 AND PHOTO-FENTON PROCESSES. | |
| Rehman et al. | Potential degradation of norfloxacin using UV-C/Fe2+/peroxides-based oxidative pathways | |
| Song et al. | Degradation of the biocide 4-chloro-3, 5-dimethylphenol in aqueous medium with ozone in combination with ultraviolet irradiation: operating conditions influence and mechanism | |
| CN117466377A (en) | Method for directionally removing refractory organic pollutants in water | |
| Ivantsova et al. | Oxidative destruction of phenol in aqueous solution by cotreatment with UV radiation and hydrogen peroxide | |
| RU2235688C2 (en) | Water photodisinfecting method | |
| CN109231350A (en) | A kind of method of sunlight collaboration chlorination degradation Organic substance in water | |
| EP0242941B1 (en) | Process and apparatus for the deodorization of air | |
| Alapi et al. | Vacuum UV radiation-driven processes | |
| US11814304B2 (en) | Ultraviolet treatment method and system | |
| Kumar et al. | Oxidation of fast green FCF by the solar photo-Fenton process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |