CN113620375A - Photocatalytic reaction device and method for wastewater treatment - Google Patents
Photocatalytic reaction device and method for wastewater treatment Download PDFInfo
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- CN113620375A CN113620375A CN202111076769.8A CN202111076769A CN113620375A CN 113620375 A CN113620375 A CN 113620375A CN 202111076769 A CN202111076769 A CN 202111076769A CN 113620375 A CN113620375 A CN 113620375A
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- 238000013032 photocatalytic reaction Methods 0.000 title claims abstract description 25
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000002351 wastewater Substances 0.000 claims abstract description 64
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 36
- 238000006731 degradation reaction Methods 0.000 claims abstract description 21
- 150000003254 radicals Chemical class 0.000 claims abstract description 21
- 230000015556 catabolic process Effects 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 239000010453 quartz Substances 0.000 claims abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000011521 glass Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 82
- 238000006243 chemical reaction Methods 0.000 claims description 31
- 239000013589 supplement Substances 0.000 claims description 14
- 230000001699 photocatalysis Effects 0.000 claims description 11
- 238000007599 discharging Methods 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims description 2
- 239000003054 catalyst Substances 0.000 abstract description 7
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 8
- 238000005070 sampling Methods 0.000 description 8
- 238000013033 photocatalytic degradation reaction Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- STZCRXQWRGQSJD-GEEYTBSJSA-M methyl orange Chemical compound [Na+].C1=CC(N(C)C)=CC=C1\N=N\C1=CC=C(S([O-])(=O)=O)C=C1 STZCRXQWRGQSJD-GEEYTBSJSA-M 0.000 description 5
- 229940012189 methyl orange Drugs 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
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- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000007146 photocatalysis Methods 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 238000004043 dyeing Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 description 2
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- 238000007639 printing Methods 0.000 description 2
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- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 description 2
- -1 sulfate radical Chemical class 0.000 description 2
- 101100210287 Drosophila melanogaster wech gene Proteins 0.000 description 1
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- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
- C02F1/325—Irradiation devices or lamp constructions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/308—Dyes; Colorants; Fluorescent agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/40—Organic compounds containing sulfur
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/32—Details relating to UV-irradiation devices
- C02F2201/326—Lamp control systems
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention discloses a photocatalytic reaction device and a method for wastewater treatment. The method only needs to promote the free radical donor to generate more free radicals by raising the temperature, does not need to add excessive free radical donor reagent or catalyst, is simple and efficient, and does not generate secondary pollution; meanwhile, the waste water can be heated to the required temperature by utilizing the self heating of the ultraviolet lamp tube, the intermittent heating of the heat exchanger and the auxiliary heater; after degradation is finished, heat energy is transferred from the treated high-temperature wastewater to imported low-temperature wastewater through the heat exchanger, so that heat loss is effectively avoided, and power consumption of the auxiliary heater is greatly reduced; in addition, if quartz or glass outer tube is selected, the reflecting paper can be selected to improve the utilization rate of the light source and reduce the light energy loss of the light source when the wastewater is treated.
Description
Technical Field
The invention belongs to the technical field of sewage treatment in environmental protection, and particularly relates to a photocatalytic reaction device and method for wastewater treatment.
Background
With the development of social economy, the contradiction between the continuously improved living standard and the increasingly serious environmental pollution is more prominent, and the effective prevention, control and treatment of pollutants become the difficult problems faced by governments of all countries in the world and to be urgently solved. Among the numerous solutions, the advanced oxidation technology based on UV induction is the use of radical donors (e.g. H)2O2、O3、S2O8 2-) Combined with ultraviolet light, hydroxyl radical (OH) and sulfate radical (SO) with strong oxidizing property are generated4) Etc., can rapidly and nonselectively oxidize most organic pollutants to CO2、H2O and inorganic matters, has the advantages of high cleanliness removal, no secondary pollution, high degradation rate, easy operation and the like;
however, the following disadvantages still exist in the existing wastewater treatment process based on the ultraviolet induced advanced oxidation technology: 1. the low generation efficiency of free radicals seriously affects the degradation rate of organic matters, namely H2O2Radical donors, such as 253.7nm ultraviolet light, H, commonly used in wastewater treatment2O2The molar absorption coefficient under light irradiation at this wavelength is low, and the generation of OH by absorbed photons is small. This requires increasing H2O2The better degradation effect can be obtained only by adding the amount of the catalyst or prolonging the illumination time. However, a large amount of experimental data indicates an excess of H2O2Not only can not generate more free radicals, but also has a certain capture effect on OH, and causes the apparent generation rate of OH in the solution to be reduced. Thus, H is excessively increased2O2Efficient degradation could not be achieved, for which reason researchers added some H2O2Catalyst to promote the formation of OH radicals, FeSO4·7H2O is one of the most commonly used catalysts, but the reaction system has too strict requirements on the pH value, and meanwhile, the risks that the catalyst is difficult to separate and recover, sludge is generated in the removal process, secondary pollution is caused, and the like exist. Therefore, how to simply, efficiently and greenly promote the generation of free radicals is crucial in the degradation process of the organic wastewater;
2. the method has the advantages that the treatment capacity is low, the cost is high due to complex process, the large-scale commercial application cannot be realized, the sewage treatment capacity of a general photocatalytic reactor is low, the sewage treatment capacity can reach the discharge standard only by repeated cyclic degradation, and additional equipment such as water storage, stirring and the like needs to be added, so that the manufacturing cost, the use cost and the occupied space of the equipment can be increased, and the complex operation process can be realized; therefore, the large-scale commercial practical application of photocatalytic degradation of organic wastewater urgently needs to develop a high-efficiency non-circulating reactor which can reach the discharge standard without circulation, so that the process is simplified, the cost and the volume of the reactor are reduced, and the space is saved.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provide a photocatalytic reaction device for wastewater treatment. Earlier studies found that the generation of. OH could be accelerated by increasing the temperature (FIG. 1), but the increase in temperature would inevitably bring about an increase in energy consumption. Therefore, the invention improves the temperature of the reaction system through ingenious design to increase the catalytic oxidation efficiency of the sewage and greatly reduce the energy loss, thereby solving the problems proposed in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a photocatalytic reaction device for wastewater treatment comprises a water inlet, a water pump, an electromagnetic flowmeter, a heat exchanger, a temperature control auxiliary heater, a reagent replenisher, a thermometer, a water outlet, an ultraviolet lamp reaction box and a control box, wherein the ultraviolet lamp reaction box and the control box are combined together;
the control box comprises an upper layer and a lower layer, the upper layer of the control box is provided with a control panel, and the lower layer of the control box is provided with a placing cavity; the water inlet, the water pump, the electromagnetic flowmeter, the first channel A of the heat exchanger, the temperature control auxiliary heater and the reagent replenisher are sequentially connected and are arranged in the placing cavity on the lower layer of the control box;
the ultraviolet lamp reaction box comprises a plurality of ultraviolet lamp tube reactors connected in series, an ultraviolet lamp tube reactor water inlet is formed in the lower end of the ultraviolet lamp reaction box and connected with the tail end of the reagent replenisher, an ultraviolet lamp tube reactor water outlet is formed in the upper end of the ultraviolet lamp reaction box and connected with a heat exchanger second channel B and a water outlet in sequence.
Preferably, the ultraviolet lamp tubular reactor includes ultraviolet tubulose light source, sleeve pipe, feeding, discharging pipe, end cap and ultraviolet lamp power connection, and is a plurality of ultraviolet lamp tubular reactor is fixed in the inside of ultraviolet lamp reaction box through the certain angle of pipe clamp slope, reflective membrane and heat preservation pipe box are wrapped up in proper order to the sleeve pipe skin, the control end of water pump, electromagnetic flowmeter, accuse temperature assistor, reagent replenisher, ultraviolet lamp power connection and thermometer passes through the control panel electric connection on connecting wire and control box upper strata.
Preferably, a thermometer is arranged at the water outlet of the ultraviolet lamp tube type reactor.
Preferably, control panel includes ballast, ultraviolet lamp switch, water pump switch, fan switch, electromagnetic flow meter controller, reagent supply controller, assists hot controller, temperature monitor, ultraviolet lamp power connection and ballast electric connection, the truckle is all installed to ultraviolet lamp reaction box and control box bottom, and the fan is all installed at the top.
Preferably, the reagent replenisher is internally provided with H2O2Solution, constitution UV/H2O2System, H2O2The flow rate is 0.23-0.50 mL/s.
Preferably, the reaction temperature of the reaction device is controlled to be 85-97 ℃ by the temperature-controlled auxiliary heater.
Preferably, the heat exchanger is one or more of a plate heat exchanger, a coil heat exchanger and a shell and tube heat exchanger.
Preferably, the ultraviolet lamp tube is made of quartz, and the sleeve of the ultraviolet lamp tube is made of one or more of quartz, glass or ceramic.
The invention also claims a method for treating wastewater by using the photocatalytic reaction device for wastewater treatment, which comprises the following steps:
s1, firstly, turning on a water pump switch, an electromagnetic flow meter controller and a reagent supplement controller through a control panel, and filling the whole ultraviolet lamp tube type reactor with wastewater at a certain flow rate;
s2, turning off the water pump, the electromagnetic flow meter and the reagent supplement controller, turning on all ultraviolet lamp switches when the wastewater is in a non-flowing state, and heating the wastewater to 95 ℃ by using the ultraviolet lamps as an initial high-temperature heat source of the heat exchanger;
s3, after the water temperature is reached, sequentially turning on a water pump switch, a fan switch, an electromagnetic flow meter controller, a reagent supplement controller, an auxiliary heat controller and a temperature display through a control panel, allowing the organic wastewater to sequentially enter the ultraviolet lamp tube reactor from a water inlet through a first channel A of a heat exchanger, the auxiliary heat exchanger and the reagent supplement device, and allowing the organic wastewater to enter the ultraviolet lamp tube reactor through the H2O2And degrading organic matters in the wastewater by using the free radical donor and OH free radicals generated by ultraviolet, discharging the wastewater subjected to photocatalytic treatment from a water outlet after passing through a second channel B of the heat exchanger, and sampling the wastewater at the water outlet at intervals to perform water sample detection.
Preferably: in step S3, during degradation, the waste water at room temperature at the water inlet and the treated high-temperature waste water exchange heat through a heat exchanger to exchange about 80% of heat, the heater only needs to intermittently assist heat to control the temperature, and the number of the lamp tubes is selected to be started according to the requirement of actual treatment capacity, so that the waste water reaching the standard can be directly discharged.
Compared with the prior art, the invention has the technical effects and advantages that:
1. according to the invention, the free radical donor is promoted to generate more free radicals only by raising the temperature, excessive free radical donor reagent or catalyst is not required to be added, the method is simple and efficient, and no secondary pollution is generated; meanwhile, through ingenious design, the waste water can be heated to the required temperature by utilizing the self heating of the ultraviolet lamp tube, the intermittent heating of the heat exchanger and the auxiliary heater; after degradation is finished, heat energy is transferred from the treated high-temperature wastewater to imported low-temperature wastewater through the heat exchanger, so that heat loss is effectively avoided, and power consumption of the auxiliary heater is greatly reduced; in addition, if a quartz or glass outer tube is selected, the utilization rate of the light source can be improved by selectively using the reflective paper, and the light energy loss of the light source in wastewater treatment is reduced;
2. the invention greatly improves the speed and the capability of decomposing pollutants in water by photocatalysis, is a non-circulating reactor, can reach the discharge standard by one-time water outlet, has no secondary pollution, and reduces the large-volume water tank and the fussy process operation required by the circulating reactor;
3. the invention can realize the control functions of the lamp such as on-off, temperature, flow rate and the like under the condition of closing the door through the control panel, thereby avoiding the damage of ultraviolet light to people and having safe and convenient operation; in conclusion, the light energy and heat energy related in the invention has high utilization rate, high degradation rate and lower cost, and is convenient for large-scale industrial application.
Drawings
FIG. 1 is a graph of experimental data of salicylic acid capture OH free radical at different temperatures;
FIG. 2 is a schematic view of the internal structure of the placement chamber of the present invention;
FIG. 3 is a schematic view showing the internal structure of the UV lamp reaction chamber according to the present invention;
FIG. 4 is a schematic view of the structure of a UV tube reactor according to the present invention;
FIG. 5 is a schematic view showing the structure of a photocatalytic reaction apparatus for wastewater treatment according to the present invention.
In the figure: 1. a water inlet; 2. a water pump; 3. an electromagnetic flow meter; 4. a heat exchanger; 5. controlling the temperature of the auxiliary heater; 6. a reagent replenisher; 7. a thermometer; 8. a water outlet; 9. an ultraviolet lamp reaction box; 10. a control box; 11. a placement chamber; 12. a water inlet of the ultraviolet lamp tube type reactor; 13. a water outlet of the ultraviolet lamp tube type reactor; 14. an ultraviolet lamp tube reactor; 15. an ultraviolet tubular light source; 16. a sleeve; 17. a feed pipe; 18. a discharge pipe; 19. a plug; 20. an ultraviolet lamp power supply connector; 21. a ballast; 22. a pipe clamping device; 23. a control panel; 24. an ultraviolet lamp switch; 25. a water pump switch; 26. a fan switch; 27. an electromagnetic flow meter controller; 28. a reagent replenishment controller; 29. an auxiliary heat controller; 30. a temperature display; 31. a caster wheel; 32. a fan.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The manufacturer of the instrument used in the invention is as follows:
water pump (manufacturer: Zhejiang le Tan pump company, Inc. model: SGR type)
Electromagnetic flowmeter and controller (manufacturer: model of Jinhuhe instrument Co., Ltd.: DPLD)
Heat exchanger (manufacturer: Hengshui Wanxiang heating and ventilation equipment Co., Ltd product type: rice-400 type-A)
Reagent replenisher (manufacturer: Kachuan Er fluid science and technology Co., Ltd product model: NKCP)
Ballast (manufacturer: Hangzhou Sihai environmental protection equipment Co., Ltd product model: SX 03-2100-)
Thermometer (manufacturer: Kaiser electric Co., Ltd product type: WRNT-05)
Auxiliary heating controller (manufacturer: Zhengtai group products of company, Inc. type: XMT series)
And a temperature display (manufacturer: measuring electronic appliance manufacturer model number: XMD-200).
Example 1
The invention provides a photocatalytic reaction device for wastewater treatment, which structurally comprises a water inlet 1, a water pump 2, an electromagnetic flow meter 3, a heat exchanger 4, a temperature control auxiliary heater 5, a reagent replenisher 6, a thermometer 7, a water outlet 8, an ultraviolet lamp reaction box 9 and a control box 10, and is characterized in that: the control box 10 comprises an upper layer and a lower layer, a control panel 23 is installed on the upper layer of the control box 10, the lower layer of the control box 10 is set to be a placing cavity 11, the heat exchanger 4 comprises a first channel A and a second channel B, the water inlet 1, the water pump 2, the electromagnetic flow meter 3, the first channel A of the heat exchanger 4, the temperature control auxiliary heater 5 and the reagent replenisher 6 are sequentially connected and placed in the placing cavity 11 on the lower layer of the control box 10, and the reaction temperature is controlled to be 85-97 ℃ through the temperature control auxiliary heater 5;
wherein, the heat exchanger 4 is one or more of a plate heat exchanger, a coil heat exchanger and a shell and tube heat exchanger;
the lower end of the ultraviolet lamp reaction box 9 is provided with an ultraviolet lamp tubular reactor water inlet 12, the tail end of the reagent replenisher 6 is connected with the ultraviolet lamp tubular reactor water inlet 12, and H is arranged in the reagent replenisher 62O2Solution, constitution UV/H2O2System, H2O2The flow rate is 0.23-0.50mL/s, the upper end of the ultraviolet lamp reaction box 9 is provided with an ultraviolet lamp tube type reactor water outlet 13, the thermometer 7 is arranged at the ultraviolet lamp tube type reactor water outlet 13, and the ultraviolet lamp tube type reactor water outlet 13 is sequentially connected with the second channel B and the water outlet 8 of the heat exchanger 4;
the ultraviolet lamp reaction box 9 and the control box 10 are organically combined, the ultraviolet lamp reaction box 9 comprises a plurality of ultraviolet lamp tubular reactors 14 connected in series, each ultraviolet lamp tubular reactor 14 comprises an ultraviolet tubular light source 15, a sleeve 16, a feeding pipe 17, a discharging pipe 18, a plug 19 and an ultraviolet lamp power connector 20, the ultraviolet lamp tubular reactors 14 are obliquely fixed inside the ultraviolet lamp reaction box 9 through pipe clamping devices 22, a reflective film and a heat-insulating pipe sleeve are sequentially wrapped on the outer layer of each sleeve 16, and the water pump 2, the electromagnetic flowmeter 3, the temperature control auxiliary heater 5, the reagent replenisher 6, the ultraviolet lamp power connector 20 and the control end of the thermometer 7 are electrically connected with a control panel 23 on the upper layer of the control box 10 through connecting wires;
the sleeve 16 of the ultraviolet tubular light source 15 is made of one or more of quartz, glass or ceramic, and if a quartz or glass outer tube is selected, reflective paper can be wrapped to improve the utilization rate of the light source;
the control panel 23 comprises a ballast 21, an ultraviolet lamp switch 24, a water pump switch 25, a fan switch 26, an electromagnetic flowmeter controller 27, a reagent supplement controller 28, an auxiliary heat controller 29 and a temperature display 30, the ultraviolet lamp power connector 20 is electrically connected with the ballast 21, casters 31 are respectively arranged at the bottoms of the ultraviolet lamp reaction box 9 and the control box 10, and fans 32 are respectively arranged at the tops of the ultraviolet lamp reaction box 9 and the control box 10;
the operation flow of the photocatalysis device for treating the wastewater specifically comprises the following steps:
s1, turning on a water pump switch, an electromagnetic flow meter controller and a reagent supplement controller through a control panel, and filling the whole ultraviolet lamp tube type reactor with the wastewater;
s2, turning off the water pump, the electromagnetic flow meter and the reagent supplement controller, turning on all ultraviolet lamp switches when the wastewater is in a non-flowing state, and heating the wastewater to 95 ℃ by using the ultraviolet lamps as an initial high-temperature heat source of the heat exchanger;
s3, after the water temperature is reached, sequentially starting a water pump switch, a fan switch, an electromagnetic flow meter controller, a reagent supplement controller, an auxiliary heat controller and a temperature display through a control panel, and then enabling the organic wastewater to enter the ultraviolet lamp tube reactor from an inlet through a first channel A of a heat exchanger, the auxiliary heat exchanger and the reagent supplement device in sequence; by means of H2O2Degrading organic matters in the wastewater by using a free radical donor and OH free radicals generated by ultraviolet, discharging the wastewater subjected to photocatalytic treatment from a water outlet after passing through a second channel B of the heat exchanger, and sampling the wastewater at the water outlet at intervals to perform water sample detection;
in step S3, during degradation, the wastewater at room temperature at the water inlet and the treated high-temperature wastewater exchange heat through the heat exchanger to exchange about 80% of heat, the heater only needs to intermittently assist heat to control the temperature, and the number of the lamp tubes is selected to be turned on according to the requirement of actual treatment capacity, so that the wastewater reaching the standard can be directly discharged.
Example 2
The photocatalytic reaction device for photocatalytic degradation of wastewater of example 1 was used to perform a Methyl Orange (MO) wastewater simulation experiment under the following test conditions:
in the degradation process, randomly sampling and detecting tail water at different times; the result shows that the methyl orange concentration and COD of the simulated wastewater subjected to photocatalytic treatment are reduced to zero without circulation, and reach the emission standard (GB 4287-.
Example 3
The photocatalytic reaction device for photocatalytic degradation of wastewater in example 1 was used to perform a methyl orange wastewater simulation experiment under the following test conditions:
in the degradation process, randomly sampling and detecting tail water at different times; results show that circulation is not needed, and the concentration ranges of methyl orange and COD of the simulated wastewater subjected to photocatalytic treatment are respectively 0-9.4 and 15.6-47.47 mg.L-1All reach the emission standard (GB 4287-.
Example 4
The photocatalytic reaction device for photocatalytic degradation of wastewater in example 1 was used to perform a dimethyl sulfoxide wastewater simulation experiment under the following test conditions:
in the degradation process, randomly sampling and detecting tail water at different times; the results show that the concentration ranges of dimethyl sulfoxide and COD of the simulated wastewater subjected to photocatalytic treatment are 0-5.35 mg.L respectively without circulation-1And 0 to 17.24 mg.L-1All reach the emission standard (GB 8978 + 1996).
Example 5
The photocatalytic reaction device for photocatalytic degradation of wastewater in example 1 was used to perform a dimethyl sulfoxide wastewater simulation experiment under the following test conditions:
in the degradation process, randomly sampling and detecting tail water at different times; the results show that no further processing is requiredCirculating, wherein the concentration ranges of dimethyl sulfoxide and COD of the simulated wastewater subjected to photocatalytic treatment are respectively 0-6.12 mg.L-1And 0 to 26.68 mg.L-1All reach the emission standard (GB 8978 + 1996).
Example 6
The photocatalytic reaction device for photocatalytic degradation of wastewater in example 1 was used to perform a biochemical wastewater degradation experiment in a certain printing and dyeing mill under the following test conditions:
in the degradation process, randomly sampling and detecting tail water at different times; the results show that circulation is not needed, and the concentration ranges of COD, ammonia nitrogen and total nitrogen of the biochemical wastewater of the printing and dyeing mill subjected to one-time treatment by 9 ultraviolet lamps are respectively 0-38.22, 4.35-8.33 and 7.92-12.35 mg.L-1All reach the standard of direct discharge (GB 4287-.
Example 7
The photocatalytic reaction device for photocatalytic degradation of wastewater in example 1 was used to perform a wastewater experiment in a pharmaceutical factory under the following test conditions:
in the degradation process, randomly sampling and detecting tail water at different times; the results show that the concentration ranges of COD, ammonia nitrogen and total nitrogen of the pharmaceutical factory wastewater subjected to one-time treatment by 9 ultraviolet lamps are respectively 0-28.35, 4.30-7.87 and 6.92-16.35 mg.L without circulation-1All reach the standard of direct emission (GB 21907-2008).
In conclusion, the method only needs to promote the free radical donor to generate more free radicals by raising the temperature, does not need to add excessive free radical donor reagent or catalyst, is simple and efficient, and does not generate secondary pollution; meanwhile, through ingenious design, the waste water can be heated to the required temperature by utilizing the self heating of the ultraviolet lamp tube, the intermittent heating of the heat exchanger and the auxiliary heater; after degradation is finished, heat energy is transferred from the treated high-temperature wastewater to imported low-temperature wastewater through the heat exchanger, so that heat loss is effectively avoided, and power consumption of the auxiliary heater is greatly reduced; in addition, if a quartz or glass outer tube is selected, the utilization rate of the light source can be improved by selectively using the reflective paper, and the light energy loss of the light source in wastewater treatment is reduced;
the invention greatly improves the speed and the capability of decomposing pollutants in water by photocatalysis, is a non-circulating reactor, can reach the discharge standard by one-time water outlet, has no secondary pollution, and reduces the large-volume water tank and the fussy process operation required by the circulating reactor;
the invention can realize the control functions of the lamp such as on-off, temperature, flow rate and the like under the condition of closing the door through the control panel, thereby avoiding the damage of ultraviolet light to people and having safe and convenient operation; in conclusion, the light energy and heat energy related in the invention has high utilization rate, high degradation rate and lower cost, and is convenient for large-scale industrial application.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (10)
1. The utility model provides a photocatalytic reaction device for waste water treatment, includes water inlet (1), water pump (2), electromagnetic flowmeter (3), heat exchanger (4), accuse temperature auxiliary heater (5), reagent replenisher (6), thermometer (7), delivery port (8), ultraviolet lamp reaction box (9), control box (10), its characterized in that: the ultraviolet lamp reaction box (9) and the control box (10) are combined together;
the control box (10) comprises an upper layer and a lower layer, the upper layer of the control box (10) is provided with a control panel (23), and the lower layer is provided with a placing cavity (11); the water inlet (1), the water pump (2), the electromagnetic flowmeter (3), the first channel A of the heat exchanger (4), the temperature control auxiliary heater (5) and the reagent replenisher (6) are sequentially connected and are arranged in the placing cavity (11) at the lower layer of the control box (10);
the ultraviolet lamp reaction box (9) comprises a plurality of ultraviolet lamp tube reactors (14) connected in series, an ultraviolet lamp tube reactor water inlet (12) is formed in the lower end of the ultraviolet lamp reaction box (9), the ultraviolet lamp tube reactor water inlet (12) is connected with the tail end of a reagent replenisher (6), an ultraviolet lamp tube reactor water outlet (13) is formed in the upper end of the ultraviolet lamp reaction box (9), and the ultraviolet lamp tube reactor water outlet (13) is sequentially connected with a heat exchanger (4), a second channel B and a water outlet (8).
2. A photocatalytic reaction apparatus for wastewater treatment according to claim 1, characterized in that: ultraviolet lamp tubular reactor (14) are including ultraviolet tubulose light source (15), sleeve pipe (16), inlet pipe (17), discharging pipe (18), end cap (19) and ultraviolet lamp power connection (20), and are a plurality of ultraviolet lamp tubular reactor (14) are fixed in the inside of ultraviolet lamp reaction box (9) through caliber ware (22) certain angle of slope, sleeve pipe (16) skin wraps up reflective membrane and heat preservation pipe box in proper order, water pump (2), electromagnetic flowmeter (3), accuse temperature auxiliary heater (5), reagent replenisher (6), ultraviolet lamp power connection (20) and thermometer (7) the control end pass through control panel (23) electric connection on connecting wire and control box (10) upper strata.
3. A photocatalytic reaction apparatus for wastewater treatment according to any one of claims 1-2, characterized in that: a thermometer (7) is arranged at the water outlet (13) of the ultraviolet lamp tube type reactor.
4. A photocatalytic reaction apparatus for wastewater treatment according to claim 2, characterized in that: control panel (23) are including ballast (21), ultraviolet lamp switch (24), water pump switch (25), fan switch (26), electromagnetic flowmeter controller (27), reagent replenishment controller (28), auxiliary heating controller (29), temperature monitor (30), ultraviolet lamp power connector (20) and ballast (21) electric connection, truckle (31) are all installed to ultraviolet lamp reaction box (9) and control box (10) bottom, and fan (32) are all installed at the top.
5. A photocatalytic reaction apparatus for wastewater treatment according to claim 1, characterized in that: the reagent replenisher (6) is internally provided with H2O2Solution, constitution UV/H2O2System, H2O2The flow rate is 0.23-0.50 mL/s.
6. A photocatalytic reaction apparatus for wastewater treatment according to claim 1, characterized in that: the reaction temperature of the reaction device is controlled to be 85-97 ℃ by the temperature-controlled auxiliary heater (5).
7. A photocatalytic reaction apparatus for wastewater treatment according to claim 1, characterized in that: the heat exchanger (4) is one or more of a plate heat exchanger, a coil heat exchanger and a shell and tube heat exchanger.
8. A photocatalytic reaction apparatus for wastewater treatment according to claim 1, characterized in that: the ultraviolet lamp tube is made of quartz, and the sleeve of the ultraviolet lamp tube is made of one or more of quartz, glass or ceramic.
9. A method for wastewater treatment using the photocatalytic reaction device for wastewater treatment according to claims 1 to 8, characterized by comprising the steps of:
s1, firstly, a water pump switch (25), an electromagnetic flow meter controller (27) and a reagent supplement controller (28) are started through a control panel (23), and the whole ultraviolet lamp tube type reactor (14) is filled with wastewater at a certain flow rate;
s2, turning off the water pump (2), the electromagnetic flowmeter (3) and the reagent supplement controller (28), wherein the wastewater is in a non-flowing state, turning on all ultraviolet lamp switches (24), and heating the wastewater to 95 ℃ by using the ultraviolet lamps as an initial high-temperature heat source of the heat exchanger;
s3, after the water temperature is reached, sequentially starting a water pump switch (25), a fan switch (26), an electromagnetic flow meter controller (27), a reagent supplement controller (28), an auxiliary heat controller (29) and a temperature display (30) through a control panel (23), enabling the organic wastewater to sequentially pass through a first channel A of a heat exchanger (4), an auxiliary heat exchanger (5) and a reagent supplement device (6) from a water inlet (1) to enter an ultraviolet lamp tube type reactor (14), and utilizing H to supplement the organic wastewater into the ultraviolet lamp tube type reactor (14)2O2Organic matters in the wastewater are degraded by OH radicals generated by the free radical donor and ultraviolet rays, the wastewater after photocatalytic treatment passes through a second channel B of the heat exchanger (4) and then is discharged from a water outlet (8), and the wastewater at the water outlet is sampled at intervals to carry out water sample detection.
10. A photocatalytic reaction apparatus for wastewater treatment according to claim 9, characterized in that: in step S3, during degradation, the waste water at room temperature at the water inlet and the treated high-temperature waste water exchange heat through a heat exchanger to exchange about 80% of heat, the heater only needs to intermittently assist heat to control the temperature, and the number of the lamp tubes is selected to be started according to the requirement of actual treatment capacity, so that the waste water reaching the standard can be directly discharged.
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Application publication date: 20211109 |