CN114890605A - Ultraviolet irradiation device and method for removing urea in solution - Google Patents
Ultraviolet irradiation device and method for removing urea in solution Download PDFInfo
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- CN114890605A CN114890605A CN202210774276.XA CN202210774276A CN114890605A CN 114890605 A CN114890605 A CN 114890605A CN 202210774276 A CN202210774276 A CN 202210774276A CN 114890605 A CN114890605 A CN 114890605A
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- urea
- ultraviolet
- light source
- ultraviolet irradiation
- acid
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- 239000004202 carbamide Substances 0.000 title claims abstract description 110
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000006243 chemical reaction Methods 0.000 claims abstract description 61
- 239000000047 product Substances 0.000 claims description 31
- 239000000460 chlorine Substances 0.000 claims description 27
- 229910052801 chlorine Inorganic materials 0.000 claims description 27
- 230000020477 pH reduction Effects 0.000 claims description 27
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 26
- 230000005855 radiation Effects 0.000 claims description 15
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 14
- 239000007800 oxidant agent Substances 0.000 claims description 13
- 239000003153 chemical reaction reagent Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 11
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 9
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 9
- 239000011358 absorbing material Substances 0.000 claims description 8
- 150000007522 mineralic acids Chemical class 0.000 claims description 8
- 150000007524 organic acids Chemical class 0.000 claims description 8
- 230000001590 oxidative effect Effects 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 6
- 239000002535 acidifier Substances 0.000 claims description 6
- 239000007795 chemical reaction product Substances 0.000 claims description 6
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 6
- KDYFGRWQOYBRFD-UHFFFAOYSA-N succinic acid Chemical compound OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
- 235000011054 acetic acid Nutrition 0.000 claims description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 3
- 235000019253 formic acid Nutrition 0.000 claims description 3
- 230000001678 irradiating effect Effects 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- 235000006408 oxalic acid Nutrition 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000001384 succinic acid Substances 0.000 claims description 3
- 235000011044 succinic acid Nutrition 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 59
- 229910021642 ultra pure water Inorganic materials 0.000 abstract description 18
- 239000012498 ultrapure water Substances 0.000 abstract description 18
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 238000002360 preparation method Methods 0.000 abstract description 5
- 239000000243 solution Substances 0.000 description 55
- 230000008569 process Effects 0.000 description 15
- 239000005708 Sodium hypochlorite Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 11
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- 125000001309 chloro group Chemical group Cl* 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 238000012544 monitoring process Methods 0.000 description 6
- 238000005868 electrolysis reaction Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910001873 dinitrogen Inorganic materials 0.000 description 4
- 239000011261 inert gas Substances 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 230000009182 swimming Effects 0.000 description 4
- PNNCWTXUWKENPE-UHFFFAOYSA-N [N].NC(N)=O Chemical compound [N].NC(N)=O PNNCWTXUWKENPE-UHFFFAOYSA-N 0.000 description 3
- VGPSUIRIPDYGFV-UHFFFAOYSA-N [N].O[N+]([O-])=O Chemical compound [N].O[N+]([O-])=O VGPSUIRIPDYGFV-UHFFFAOYSA-N 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- XTEGARKTQYYJKE-UHFFFAOYSA-M Chlorate Chemical compound [O-]Cl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-M 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000006065 biodegradation reaction Methods 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000012295 chemical reaction liquid Substances 0.000 description 2
- -1 chlorine-substituted urea Chemical class 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- BZSXEZOLBIJVQK-UHFFFAOYSA-N 2-methylsulfonylbenzoic acid Chemical compound CS(=O)(=O)C1=CC=CC=C1C(O)=O BZSXEZOLBIJVQK-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- TYXNQDAIWMHZAY-UHFFFAOYSA-N [C].NC(N)=O Chemical class [C].NC(N)=O TYXNQDAIWMHZAY-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000004071 biological effect Effects 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229910001919 chlorite Inorganic materials 0.000 description 1
- 229910052619 chlorite group Inorganic materials 0.000 description 1
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- NNNSKJSUQWKSAM-UHFFFAOYSA-L magnesium;dichlorate Chemical compound [Mg+2].[O-]Cl(=O)=O.[O-]Cl(=O)=O NNNSKJSUQWKSAM-UHFFFAOYSA-L 0.000 description 1
- NWAPVVCSZCCZCU-UHFFFAOYSA-L magnesium;dichlorite Chemical compound [Mg+2].[O-]Cl=O.[O-]Cl=O NWAPVVCSZCCZCU-UHFFFAOYSA-L 0.000 description 1
- YZQBYALVHAANGI-UHFFFAOYSA-N magnesium;dihypochlorite Chemical compound [Mg+2].Cl[O-].Cl[O-] YZQBYALVHAANGI-UHFFFAOYSA-N 0.000 description 1
- 238000003760 magnetic stirring Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- VKJKEPKFPUWCAS-UHFFFAOYSA-M potassium chlorate Chemical compound [K+].[O-]Cl(=O)=O VKJKEPKFPUWCAS-UHFFFAOYSA-M 0.000 description 1
- SATVIFGJTRRDQU-UHFFFAOYSA-N potassium hypochlorite Chemical compound [K+].Cl[O-] SATVIFGJTRRDQU-UHFFFAOYSA-N 0.000 description 1
- VISKNDGJUCDNMS-UHFFFAOYSA-M potassium;chlorite Chemical compound [K+].[O-]Cl=O VISKNDGJUCDNMS-UHFFFAOYSA-M 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- UKLNMMHNWFDKNT-UHFFFAOYSA-M sodium chlorite Chemical compound [Na+].[O-]Cl=O UKLNMMHNWFDKNT-UHFFFAOYSA-M 0.000 description 1
- 229960002218 sodium chlorite Drugs 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 150000003672 ureas Chemical class 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—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
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/32—Details relating to UV-irradiation devices
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/32—Details relating to UV-irradiation devices
- C02F2201/322—Lamp arrangement
- C02F2201/3226—Units using UV-light emitting lasers
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/32—Details relating to UV-irradiation devices
- C02F2201/322—Lamp arrangement
- C02F2201/3227—Units with two or more lamps
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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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)
Abstract
The invention provides an ultraviolet irradiation device and a method for removing urea in a solution. The ultraviolet irradiation apparatus includes: an ultraviolet light source for emitting ultraviolet light; a light guide device having a hollow structure and allowing at least part of the ultraviolet rays of the ultraviolet light source to pass through the hollow structure thereof in parallel; and a reaction vessel for holding a urea-comprising solution; and the ultraviolet light passing through the light guide means can act substantially perpendicularly on the urea-containing solution to remove urea. The device for removing urea in water has a simple structure, is suitable for efficiently removing low-concentration urea in an ultrapure water production system, and can ensure the quality of produced water when reclaimed water is applied to electronic-grade ultrapure water preparation.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to an ultraviolet irradiation device and method for removing urea in water.
Background
At present, countries in the world face severe water resource shortage, water environment pollution and other problems, and the utilization of reclaimed water is an important way for solving the water resource problem.
The semiconductor manufacturing industry is a high water consumption industry, and has large demand on ultrapure water and high water quality requirement. The amount of fresh water resources required by the station for power accumulation is reported to reach 160 hundred million meters per year 3 The amount of water resources required for producing ultrapure water is very large. With the attention on the independent production of the chips and the great investment, the chip manufacturing industry has huge demand on water resources in the future, and the traditional water resources are difficult to meet the demand of the ultra-pure water which is rapidly increased. Semiconductor manufacturing enterprises are gradually exploring to use urban reclaimed water for preparing electronic-grade ultrapure water, and under the condition of facing severe water problems such as water resource shortage, water environment pollution and the like, the application of non-traditional water sources (urban reclaimed water, polluted surface water and the like) in the preparation of the electronic-grade ultrapure water is an important support for high-quality development of the electronic industry.
The concentration of the urea in the regenerated water is 2-5 times higher than that of the urea in the tap water after reverse osmosis treatment, and research results obtained by using an ultrapure water pilot system show that the existing ultrapure water production process can not completely remove the urea, about 20% of the urea in the inlet water passes through the whole ultrapure water production process and contributes about 25% of total organic carbon in the ultrapure water. The method can effectively remove urea, and becomes a key problem of applying the reclaimed water to the electronic grade ultrapure water production.
Existing urea removal technologies include biodegradation, physical adsorption, chemical oxidation, and the like. The biodegradation technology relying on microbial activity is not suitable for removing low-concentration organic matters, the physical adsorption has poor adsorption effect on hydrophilic and non-electrical urea, particularly low-concentration urea, and new problems can be caused by replacement of an adsorbent, desorption of pollutants or dissolution of impurities.
Citation 1 discloses an electrolysis device for removing urea in water, which comprises an electrolysis bath and an electrode group, wherein the electrolysis bath comprises a bath body, two fixing frames, a water inlet and a water outlet, the two fixing frames are respectively positioned at two ends of the bath body, the bath body is fixed with the fixing frames through stainless steel screws, the water inlet is positioned at the bottom end of the electrolysis bath, and the water outlet is positioned at the top end of the electrolysis bath; the electrode group comprises an anode and a cathode, wherein the anode is a titanium-based metal oxide coating electrode, the cathode is an iron plate, the anode and the cathode are respectively fixed on the fixing frame and are respectively positioned at two ends of the electrolytic cell, and the anode and the cathode are respectively connected with a main cathode of a direct current power supply. However, this method has the disadvantages of low efficiency, limitation of the concentration of the urea in the feed water and complicated process, and is not suitable for removing low concentration urea.
Citation 3 discloses a device for removing urea in a swimming pool, which comprises a circulating water tank, an ozone generator, a field energy catalytic oxidation device and a catalyst, wherein the field energy catalytic oxidation device is positioned in the circulating water tank, the ozone generator is positioned outside the circulating water tank, a functional bubble gas dissolving machine negative pressure pipe of the ozone generator is positioned in the circulating water tank, the catalyst is alkali and persulfate, a water inlet pipe of the circulating water tank and a water outlet end of a lift water pump are connected through a pipeline, a water outlet pipe of the circulating water tank is positioned on the swimming pool, discharged water enters the swimming pool, and a PLC (programmable logic controller) is connected with the lift water pump, the ozone generator and the field energy catalytic oxidation device through leads. However, the method has low removal efficiency and poor economic benefit, can not be used for removing low-concentration urea, and has a certain distance from ideal practical application effect.
In conclusion, research and development of a method for efficiently removing low-concentration urea, which is suitable for an ultrapure water production system, are urgently needed to ensure the quality of produced water when reclaimed water is applied to electronic grade ultrapure water preparation.
Cited documents:
cited document 1: CN105129924A
Cited document 2: CN105819591A
Cited document 3: CN108996658A
Disclosure of Invention
Problems to be solved by the invention
Aiming at the technical problems in the prior art, the invention firstly provides a device for removing urea in water, which has a simple structure, is suitable for an ultrapure water production system to efficiently remove low-concentration urea and can ensure the quality of produced water when reclaimed water is applied to electronic grade ultrapure water preparation.
Further, the invention also provides a method for removing urea in water, which can effectively oxidize and decompose the urea in the water.
Means for solving the problems
[1] The present invention first provides an ultraviolet irradiation apparatus, comprising:
an ultraviolet light source for emitting ultraviolet light;
a light guide device having a hollow structure and allowing at least part of the ultraviolet rays of the ultraviolet light source to pass through the hollow structure thereof in parallel; and (c) a second step of,
a reaction vessel for holding a urea-containing solution; and the ultraviolet light passing through the light guide means can act substantially perpendicularly on the urea-containing solution to remove urea.
[2] The ultraviolet irradiation apparatus according to the above [1], wherein the ultraviolet rays include at least a radiation wave having a wavelength of 185nm and a radiation wave having a wavelength of 254 nm; the light directing device is a hollow tubular device.
[3] The ultraviolet irradiation device according to the above [1] or [2], wherein the ultraviolet light source has a housing and a cover on the outside thereof, wherein,
the shell is provided with an air inlet; and a power line is arranged at the position of the sealing cover to supply power to the ultraviolet light source.
[4] The ultraviolet irradiation apparatus according to any one of the above [1] to [3], wherein at least an inner surface of the reaction vessel and/or the light guide means is coated with a light absorbing material.
[5] The ultraviolet irradiation apparatus according to any one of the above [1] to [4], wherein a light shield is provided at least at a position where the light guide means is close to the outlet of the reaction vessel and where the reaction vessel receives ultraviolet light.
[6] The ultraviolet irradiation apparatus according to any one of the above [1] to [5], wherein the ultraviolet irradiation apparatus further comprises a support structure for supporting the ultraviolet light source, the light guiding device and the reaction vessel and adjusting the relative position and the relative distance between the ultraviolet light source and the light guiding device, the light guiding device and the reaction vessel.
[7] A method for removing urea from a solution comprising the steps of:
an acidification step, namely, carrying out acidification treatment on the urea solution by using an acidification reagent to obtain an acidification product;
a mixing step, mixing an oxidizing reagent and an acidification product to obtain a mixed product;
an irradiation step, namely irradiating the mixed product by using an ultraviolet irradiation device to enable urea to generate chemical reaction to obtain a reaction product; wherein,
the ultraviolet irradiation apparatus is any one of the ultraviolet irradiation apparatuses described in [1] to [6 ].
[8] The process according to [7] above, wherein the pH of the acidified product after the acidification treatment is 2 to 3.5; and/or the presence of a gas in the gas,
the acidifying agent comprises an inorganic acid or an organic acid; preferably, the inorganic acid comprises one or a combination of more than two of sulfuric acid, hydrochloric acid, nitric acid and phosphoric acid, and the organic acid comprises one or a combination of more than two of oxalic acid, acetic acid, formic acid and succinic acid.
[9] The method according to the above [7] or [8], wherein the oxidizing agent is a chlorine-containing oxidizing agent; preferably, in the chlorine-containing oxidizing agent, the ratio of the mass concentration of the active chlorine to the mass concentration of urea is 2.5 or more, preferably 5 or more, in terms of active chlorine.
[10] The method according to any one of the above [7] to [10], wherein the irradiation step is performed for 30min or less.
ADVANTAGEOUS EFFECTS OF INVENTION
The device for removing urea in water has a simple structure, is suitable for efficiently removing low-concentration urea in an ultrapure water production system, and can ensure the quality of produced water when reclaimed water is applied to electronic-grade ultrapure water preparation.
The method for removing the urea in the water can completely remove the urea in the water, and converts the urea nitrogen into nitric acid nitrogen, ammonia nitrogen and nitrogen gas, thereby avoiding secondary pollution to the environment.
Drawings
FIG. 1 shows a schematic diagram of the apparatus for removing urea from water according to the present invention;
description of the reference numerals
1: an ultraviolet light source; 2: a housing; 3: an air inlet;
4: a support; 5: a light directing device; 6: sealing the cover;
7: a light shield; 8: a lifting platform; 9: a reaction vessel.
Figure 2 shows the urea removal effect of the process of the invention at different sodium hypochlorite concentrations of examples 1-4 of the invention (pH 3, urea concentration 4 mg/L);
FIG. 3 shows the urea removal effect of the process of the invention at different pH values according to examples 5-8 of the invention (urea concentration of 2mg/L, active chlorine content of 10 mg-Cl) 2 /L)。
Detailed Description
The present invention will be described in detail below. The technical features described below are explained based on typical embodiments and specific examples of the present invention, but the present invention is not limited to these embodiments and specific examples. It should be noted that:
in the present specification, the numerical range represented by "numerical value a to numerical value B" means a range including the end point numerical value A, B.
In the present specification, "plural" in "plural", and the like means a numerical value of 2 or more unless otherwise specified.
In this specification, the terms "substantially", "substantially" or "substantially" mean an error of less than 5%, or less than 3% or less than 1% as compared to the relevant perfect or theoretical standard.
In the present specification, "%" denotes mass% unless otherwise specified.
In the present specification, the meaning of "may" includes both the meaning of performing a certain process and the meaning of not performing a certain process.
In this specification, "optional" or "optionally" means that the subsequently described event or circumstance may or may not occur, and that the description includes instances where the event occurs and instances where it does not.
In the present specification, reference to "some particular/preferred embodiments," "other particular/preferred embodiments," "embodiments," and the like, means that a particular element (e.g., feature, structure, property, and/or characteristic) described in connection with the embodiment is included in at least one embodiment described herein, and may or may not be present in other embodiments. In addition, it is to be understood that the described elements may be combined in any suitable manner in the various embodiments.
In the present specification, the terms "normal temperature", "room temperature" and the like mean 10 to 40 ℃.
<First aspect>
A first aspect of the present invention provides an ultraviolet irradiation apparatus comprising:
an ultraviolet light source 1, the ultraviolet light source 1 being for emitting ultraviolet light;
a light guide device 5, wherein the light guide device 5 has a hollow structure, and at least part of ultraviolet rays of the ultraviolet light source 1 pass through the hollow structure in parallel; and
a reaction vessel 9, the reaction vessel 9 being for containing a urea-comprising solution; and the ultraviolet rays passing through the light guiding means 5 can act substantially perpendicularly on the urea-containing solution to remove urea.
Ultraviolet light source
The ultraviolet light source 1 of the present invention is a non-lighting electric light source mainly generating ultraviolet radiation, and therefore, the ultraviolet light source 1 of the present invention is used to emit ultraviolet rays. In general, the ultraviolet light source 1 has a fluorescence effect, a biological effect, a photochemical effect, and a photoelectric effect. In addition, the ultraviolet light source 1 emits ultraviolet rays at a higher frequency than visible rays. Generally, ultraviolet rays can be classified into 4 types, i.e., UVA (ultraviolet A, wavelength 400nm to 320nm, low-frequency wavelength), UVB (wavelength 320nm to 280nm, intermediate-frequency medium-frequency wavelength), UVC (wavelength 280nm to 100nm, high-frequency short-wave), and EUV (ultra high frequency, wavelength 100nm to 10 nm).
In the present invention, in view of acting on urea, it is preferable to use a dual wavelength ultraviolet lamp as the ultraviolet light source 1. That is, in the present invention, the ultraviolet rays include at least a radiation wave having a wavelength of 185nm and a radiation wave having a wavelength of 254 nm. The inventors have found that urea in the urea-containing solution can be completely removed when a dual wavelength ultraviolet lamp is used as the ultraviolet light source 1.
Furthermore, the material used by the lamp tube of the dual-wavelength ultraviolet lamp can be high-transmittance quartz, so that the emission of ultraviolet rays can not be influenced.
In some specific embodiments, the ultraviolet light source 1 has an outer shell 2 and a cover 6 on the outside, wherein the outer shell 2 is provided with an air inlet 3; by providing the air inlet 3, inert gas can be introduced to remove air by using a gas guide tube, thereby reducing the loss of 185nm ultraviolet rays caused by the absorption of oxygen in the air. The housing 2 of the present invention is provided with a channel into which the light guide 5 can be inserted, so that the entire irradiation process can be performed in a sealed environment.
In addition, a power line is arranged at the position of the cover 6 to supply power to the ultraviolet light source 1.
The material of the housing 2 and the cover 6 is not particularly limited, and may be any material available in the art, such as a metal material. The inert gas is not particularly limited in the present invention, and may be any gas that does not participate in chemical reactions, which is commonly used in the art, for example: nitrogen, argon, and the like.
Light guide device
A light guide device 5, wherein the light guide device 5 has a hollow structure, and at least part of the ultraviolet rays of the ultraviolet light source 1 parallelly pass through the hollow structure. The invention obtains the ultraviolet rays emitted from the ultraviolet light source 1 through the light guide device 5, and the ultraviolet rays are parallel beams.
The invention can enable the ultraviolet rays emitted by the ultraviolet light source 1 to act on the solution containing the urea in parallel by using the light guide device 5, and the urea is subjected to chemical reaction, thereby removing the urea in the solution.
In particular, the light guiding device 5 may be a hollow tubular device, and preferably may be a collimator tube, such that the ultraviolet light emitted by the ultraviolet light source 1 generates collimator light in the collimator tube, and the collimator light can pass through the collimator tube.
In some specific embodiments, the inner and/or outer surface of the light guiding device 5 is coated with a light absorbing material to eliminate interference of non-parallel light rays generated by reflection at the inner wall of the light guiding device 5. As the light absorbing material, the present invention is not particularly limited, and may be some light absorbing materials commonly used in the art, such as black light absorbing cloth, etc.
The material of the light guide 5 is not particularly limited in the present invention, and may be any material that is feasible in the art, such as a metal material. The number of the light guide devices 5 is not particularly limited in the present invention, and may be one or more, preferably two or more, for example: 1, 2, 3, 4, 5, 6, etc.
Reaction vessel
The reaction vessel 9 of the present invention is used for containing a urea-containing solution; and the ultraviolet rays passing through the light guiding means 5 can act on the urea-containing solution to remove urea. The shape and structure of the reaction vessel 9 are not particularly limited in the present invention, and may be used for holding a urea-containing solution.
In some specific embodiments, the inner and/or outer surface of the reaction vessel 9 is coated with a light absorbing material to eliminate interference of non-parallel light rays generated by reflection from the inner wall of the reaction vessel 9. As the light absorbing material, the present invention is not particularly limited, and may be some light absorbing materials commonly used in the art, such as black light absorbing cloth, etc.
The material of the reaction vessel 9 is not particularly limited in the present invention, and may be any material available in the art, such as metal material, quartz material, etc. The number of reaction vessels 9 is not particularly limited in the present invention, and may be one or more, preferably two or more, in accordance with the light guide device 5, for example: 1, 2, 3, 4, 5, 6, etc.
In some specific embodiments, a light shield 7 is provided at least at the light guiding means 5 near the outlet of the reaction vessel 9 and at the position of the reaction vessel 9 receiving the ultraviolet light. The risk caused by ultraviolet leakage can be isolated by arranging the light shield 7, the reaction vessel 9 is ensured to be arranged in an inert gas environment, and the chemical reaction can be carried out under the dark condition.
Further, in the present invention, in order to facilitate the removal of urea in the solution, the ultraviolet irradiation apparatus further comprises a support structure to support the ultraviolet light source 1, the light guiding device 5 and the reaction vessel 9, and to adjust the relative positions and relative distances of the ultraviolet light source 1 and the light guiding device 5, the light guiding device 5 and the reaction vessel 9.
Specifically, the ultraviolet irradiation device may be supported by the support 4, and the light guide device 5 and the reaction vessel 9 may be supported by the elevating platform 8. So that the relative positions and relative distances of the ultraviolet light source 1, the light guide device 5 and the reaction vessel 9 are adjusted by the lifting platform 8, so that the whole irradiation process is carried out in the inert gas environment.
The ultraviolet irradiation device can completely remove urea in water and convert urea nitrogen into nitric acid nitrogen, ammonia nitrogen and nitrogen.
<Second aspect of the invention>
A second aspect of the invention provides a method of removing urea from a solution comprising the steps of:
an acidification step, namely, carrying out acidification treatment on the urea solution by using an acidification reagent to obtain an acidification product;
a mixing step, mixing an oxidizing reagent and an acidification product to obtain a mixed product;
an irradiation step, namely irradiating the mixed product by using an ultraviolet irradiation device to enable urea to generate chemical reaction to obtain a reaction product; wherein,
the ultraviolet irradiation apparatus is the ultraviolet irradiation apparatus according to the first aspect of the present invention.
Acidification step
According to the invention, an acidification reagent is used for carrying out acidification treatment on the urea solution to obtain an acidified product. The acidification process has two functions, namely, the chlorine molecules and the urea have better reaction effect in order to form more chlorine molecules by the chlorine-containing oxidizing reagent subsequently, and the urea is protonated, so that the urea can react with free radicals generated in the irradiation process more easily.
In some specific embodiments, after the acidification treatment, the pH of the acidified product is between 2 and 3.5, for example: 2.2, 2.5, 2.8, 3, 3.2, etc. Furthermore, a water quality analyzer can be adopted to carry out real-time pH monitoring in the acidification treatment process, so that the pH value is controlled. Specifically, the reaction solution may be mixed uniformly into a homogeneous system by continuously stirring with a magnetic stirrer. And continuously adding an acidifying agent until the real-time pH value monitoring result shows that the reaction solution can stop when the pH value is stabilized at 2-3.5, so as to obtain an acidified product.
The acidifying agent is not particularly limited in the present invention, and may be one commonly used in the art. Specifically, the acidifying agent comprises an inorganic acid or an organic acid; preferably, the inorganic acid comprises one or a combination of more than two of sulfuric acid, hydrochloric acid, nitric acid and phosphoric acid, and the organic acid comprises one or a combination of more than two of oxalic acid, acetic acid, formic acid and succinic acid. Preferably, the present invention preferably uses an inorganic acid as the acidifying agent, considering that an organic acid may generate an unnecessary product under photoreaction and that an organic acid is more costly than an inorganic acid.
Mixing step
The invention mixes the oxidizing reagent and the acidification product to obtain the mixed product. In the mixing process, the oxidation reagent and the urea can generate substitution reaction to generate a small amount of substituted urea products, and the urea and the free radicals are in full contact reaction in the irradiation process after being fully mixed. When using a chloroxidizing agent, the chloroxidizing agent reacts with the urea to produce a small amount of a chlorine-substituted urea product that can be effectively removed under ultraviolet conditions.
In some specific embodiments, the oxidizing agent used in the present invention is preferably a chlorine-containing oxidizing agent, which is the most widely used agent in the field of disinfection, bleaching, etc., and can generate a large amount of oxidizing radicals under ultraviolet irradiation, so that the oxidizing agent has a good reaction effect, and the chlorine-containing oxidizing agent and urea undergo a substitution reaction to generate a chlorine-substituted urea product.
The amount of the chlorine-containing oxidizing agent to be used is not particularly limited in the present invention, and may be added as needed. Preferably, in the chlorine-containing oxidizing agent, the ratio of the mass concentration of the active chlorine to the mass concentration of urea is 2.5 or more, preferably 5 or more, in terms of active chlorine, for example: 3. 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5,9. 9.5, 10, 11, etc., and the ratio of the mass concentration to the mass concentration of urea is usually preferably 7 to 10. For example: for urea solution with concentration of 1mg/L, the active chlorine content in sodium hypochlorite solution added after acidification is preferably 5mg-Cl 2 More than/L. When the ratio of the mass concentration of the active chlorine to the mass concentration of urea is 2.5 or more, particularly 5 or more, it is more advantageous to remove urea.
Further, in the mixing step, the reaction solution needs to be rapidly mixed by a magnetic stirring meter under dark and normal temperature conditions to simulate the actual application scenario and reduce the loss of the oxidizing reagent under light.
The chlorine-containing oxidizing agent is not particularly limited in the present invention, and may be one commonly used in the art. For example: hypochlorite, chlorite, chlorate, and the like. Specifically, the chlorine-containing oxidizing agent may be one or a combination of two or more of sodium hypochlorite, potassium hypochlorite, magnesium hypochlorite, sodium chlorite, potassium chlorite, magnesium chlorite, sodium chlorate, potassium chlorate, magnesium chlorate, and the like.
Irradiation step
The invention uses the ultraviolet irradiation device to perform irradiation treatment on the mixed product, so that urea generates chemical reaction to obtain a reaction product; wherein the ultraviolet irradiation apparatus is the ultraviolet irradiation apparatus according to the first aspect of the present invention.
The ultraviolet rays include at least a radiation wave having a wavelength of 185nm and a radiation wave having a wavelength of 254 nm. Before use, air is removed by introducing nitrogen gas through the gas-guide tube, so as to reduce the loss of 185nm ultraviolet rays caused by the absorption of oxygen in the air. After the air is exhausted, the power supply is turned on, the ultraviolet light source 1 is turned on, and ultraviolet irradiation can be carried out when the power of the light source is stable. During the irradiation, the ultraviolet rays emitted by the ultraviolet light source 1 generate parallel light in the light guide device 5, and the parallel light can pass through the light guide device 5 and act on the urea-containing solution in the reaction vessel 9 to remove urea.
In some specific embodiments, in the irradiation step, the irradiation time is less than 30min, preferably 1 to 30min, for example: 5min, 10min, 15min, 20min, 25min and the like. Thus, the process of the invention allows for a rapid removal of urea from the solution. Further, the irradiation process is also performed in a dark condition.
The method for removing the urea in the solution can completely remove the urea in the water and convert the urea nitrogen into nitric acid nitrogen, ammonia nitrogen and nitrogen.
Examples
Embodiments of the present invention will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
The ultraviolet light source used in the examples was a dual wavelength ultraviolet lamp.
Example 1
1. Acidification of urea solutions
Dilute sulfuric acid is added into an intermittent reaction device containing 2mg/L urea solution, a water quality analyzer is used for monitoring pH in real time, and a magnetic stirrer is used for continuously stirring, so that reaction liquid is uniformly mixed to form a uniform system. And (4) continuously adding dilute sulfuric acid until the real-time pH value monitoring result shows that the pH value of the reaction solution is stabilized at about 3, and stopping to obtain an acidified product.
2. Mixing
After the urea solution in the intermittent reaction device is acidified, sodium hypochlorite solution is added at normal temperature and in the dark. The reaction solution was mixed uniformly by continuous stirring with a magnetic stirrer. Wherein the content of active chlorine in the sodium hypochlorite solution is 5mg-Cl 2 and/L to obtain a mixed product.
3. Ultraviolet radiation
And placing the mixed product in a reaction vessel of an ultraviolet irradiation device for ultraviolet irradiation to enable urea to generate chemical reaction, thereby obtaining a reaction product. The ultraviolet irradiation apparatus used is the ultraviolet irradiation apparatus of the present invention, wherein the ultraviolet rays include at least a radiation wave having a wavelength of 185nm and a radiation wave having a wavelength of 254 nm. Before use, air is removed by introducing nitrogen gas through the gas-guide tube, so as to reduce the loss of 185nm ultraviolet rays caused by the absorption of oxygen in the air. After the air is exhausted, the power supply is turned on, the ultraviolet light source is turned on, and the ultraviolet irradiation can be carried out when the power of the ultraviolet light source is stable. During the irradiation, the ultraviolet rays emitted by the ultraviolet light source generate parallel light in the light guide device, and the parallel light can pass through the light guide device and act on the urea-containing solution in the reaction vessel to remove urea.
Example 2
The content of active chlorine in the sodium hypochlorite solution in example 1 was adjusted to 10mg-Cl 2 and/L, keeping other conditions unchanged, and obtaining solutions with different residual urea contents.
Example 3
The active chlorine content in the sodium hypochlorite solution in example 1 was adjusted to 15mg-Cl 2 and/L, keeping other conditions unchanged, and obtaining solutions with different residual urea contents.
Example 4
The active chlorine content in the sodium hypochlorite solution in example 1 was adjusted to 20mg-Cl 2 and/L, keeping other conditions unchanged, and obtaining solutions with different residual urea contents.
Example 5
1. Acidification of urea solutions
Dilute sulfuric acid is added into an intermittent reaction device containing 2mg/L urea solution, a water quality analyzer is used for monitoring pH in real time, and a magnetic stirrer is used for continuously stirring, so that reaction liquid is uniformly mixed to form a uniform system. And (3) continuously adding dilute sulfuric acid until the real-time pH value monitoring result shows that the pH value of the reaction solution is stabilized to about 2, and stopping to obtain an acidified product.
2. Mixing
After the urea solution in the intermittent reaction device is acidified, sodium hypochlorite solution is added at normal temperature and in the dark.The reaction solution was mixed uniformly by continuous stirring with a magnetic stirrer. Wherein the content of active chlorine in the sodium hypochlorite solution is 10mg-Cl 2 and/L to obtain a mixed product.
3. Ultraviolet radiation
And placing the mixed product in a reaction vessel of an ultraviolet irradiation device for ultraviolet irradiation to enable urea to generate chemical reaction, thereby obtaining a reaction product. The ultraviolet irradiation apparatus used is the ultraviolet irradiation apparatus of the present invention, wherein the ultraviolet rays include at least a radiation wave having a wavelength of 185nm and a radiation wave having a wavelength of 254 nm. Before use, air is removed by introducing nitrogen gas through the gas-guide tube, so as to reduce the loss of 185nm ultraviolet rays caused by the absorption of oxygen in the air. After the air is exhausted, the power supply is turned on, the ultraviolet light source is turned on, and the ultraviolet irradiation can be carried out when the power of the ultraviolet light source is stable. During the irradiation, the ultraviolet rays emitted by the ultraviolet light source generate parallel light in the light guide device, and the parallel light can pass through the light guide device and act on the urea-containing solution in the reaction vessel to remove urea.
Example 6
The pH of the reaction solution in example 5 was adjusted to 2.5, and other conditions were unchanged to obtain solutions with different residual urea contents.
Example 7
The pH of the reaction solution in example 5 was adjusted to 3.0, and other conditions were unchanged to obtain solutions with different residual urea contents.
Example 8
The pH of the reaction solution in example 5 was adjusted to 3.3, and other conditions were unchanged to obtain solutions with different residual urea contents.
Performance testing
The percentage of residual urea was measured at various time points in the irradiation time range 0-20 minutes for examples 1-8 according to the method described in section 13 of GB/T18204.2-2014, and the results are shown in FIG. 2.
As can be seen from FIG. 2, the removal of urea can be achieved in a shorter time as the content of active chlorine in the sodium hypochlorite solution increases.
The percentage of residual urea was measured at various time points in the irradiation time range 0-9 minutes for examples 5-8 according to the method described in section 13 of GB/T18204.2-2014, and the results are shown in FIG. 3.
As can be seen from fig. 3, as the pH of the mixed solution decreases, the removal of urea can be achieved in a shorter time.
It should be noted that, although the technical solutions of the present invention are described by specific examples, those skilled in the art can understand that the present invention should not be limited thereto.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. An ultraviolet irradiation apparatus, comprising:
an ultraviolet light source for emitting ultraviolet light;
a light guide device having a hollow structure and allowing at least part of the ultraviolet rays of the ultraviolet light source to pass through the hollow structure thereof in parallel; and the number of the first and second groups,
a reaction vessel for holding a urea-containing solution; and the ultraviolet light passing through the light guide means can act substantially perpendicularly on the urea-containing solution to remove urea.
2. The ultraviolet irradiation apparatus as set forth in claim 1, wherein the ultraviolet rays include at least a radiation wave having a wavelength of 185nm and a radiation wave having a wavelength of 254 nm; the light directing device is a hollow tubular device.
3. The ultraviolet irradiation apparatus according to claim 1 or 2, wherein the ultraviolet light source has an outer casing and a cover on the outside thereof, wherein,
the shell is provided with an air inlet; and a power line is arranged at the position of the sealing cover to supply power to the ultraviolet light source.
4. The ultraviolet irradiation device as set forth in any one of claims 1 to 3, wherein at least an inner surface of the reaction vessel and/or the light guide means is coated with a light absorbing material.
5. The ultraviolet irradiation device as set forth in any one of claims 1 to 4, wherein a light shield is provided at least at the position of the light guide device near the outlet of the reaction vessel and at the position of the reaction vessel receiving the ultraviolet rays.
6. The ultraviolet irradiation device as set forth in any one of claims 1 to 5, further comprising a support structure for supporting the ultraviolet light source, the light guiding means and the reaction vessel and adjusting the relative positions and relative distances of the ultraviolet light source and the light guiding means, the light guiding means and the reaction vessel.
7. A method for removing urea from a solution, comprising the steps of:
an acidification step, namely, carrying out acidification treatment on the urea solution by using an acidification reagent to obtain an acidification product;
a mixing step, mixing an oxidizing reagent and an acidification product to obtain a mixed product;
an irradiation step, namely irradiating the mixed product by using an ultraviolet irradiation device to enable urea to generate chemical reaction to obtain a reaction product; wherein,
the ultraviolet irradiation apparatus is the ultraviolet irradiation apparatus described in any one of claims 1 to 6.
8. The method of claim 7, wherein after the acidification treatment, the pH of the acidified product is 2-3.5; and/or the presence of a gas in the gas,
the acidifying agent comprises an inorganic acid or an organic acid; preferably, the inorganic acid comprises one or a combination of more than two of sulfuric acid, hydrochloric acid, nitric acid and phosphoric acid, and the organic acid comprises one or a combination of more than two of oxalic acid, acetic acid, formic acid and succinic acid.
9. The method of claim 7 or 8, wherein the oxidizing agent is a chloroxidizing agent; preferably, in the chlorine-containing oxidizing agent, the ratio of the mass concentration of the active chlorine to the mass concentration of urea is 2.5 or more, preferably 5 or more, in terms of active chlorine.
10. The method according to any one of claims 7 to 9, wherein in the irradiation step, the irradiation time is 30min or less.
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| WO2024130923A1 (en) * | 2022-12-23 | 2024-06-27 | 清华大学 | Continuous flow reactor, reaction system and method for removing urea from solution |
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