CN112607845A - Method for treating organic wastewater by using ozone composite activated carbon nano titanium dioxide - Google Patents
Method for treating organic wastewater by using ozone composite activated carbon nano titanium dioxide Download PDFInfo
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- CN112607845A CN112607845A CN202110106020.7A CN202110106020A CN112607845A CN 112607845 A CN112607845 A CN 112607845A CN 202110106020 A CN202110106020 A CN 202110106020A CN 112607845 A CN112607845 A CN 112607845A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 91
- 239000002351 wastewater Substances 0.000 title claims abstract description 56
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 title claims abstract description 40
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 239000002131 composite material Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 73
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 57
- 239000000945 filler Substances 0.000 claims abstract description 23
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000002245 particle Substances 0.000 claims abstract description 8
- 239000011941 photocatalyst Substances 0.000 claims abstract description 5
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 5
- 230000002195 synergetic effect Effects 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims abstract description 3
- 238000005273 aeration Methods 0.000 claims description 22
- 229910021389 graphene Inorganic materials 0.000 claims description 9
- 230000000903 blocking effect Effects 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 7
- 239000000919 ceramic Substances 0.000 claims description 6
- 238000006555 catalytic reaction Methods 0.000 claims description 3
- 239000000725 suspension Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 239000003344 environmental pollutant Substances 0.000 abstract description 3
- 231100000719 pollutant Toxicity 0.000 abstract description 3
- 239000002957 persistent organic pollutant Substances 0.000 abstract description 2
- 238000004065 wastewater treatment Methods 0.000 abstract description 2
- 229910052799 carbon Inorganic materials 0.000 description 10
- 238000007254 oxidation reaction Methods 0.000 description 6
- 230000004888 barrier function Effects 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 4
- 230000001699 photocatalysis Effects 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 238000002306 biochemical method Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 208000005623 Carcinogenesis Diseases 0.000 description 1
- 208000031320 Teratogenesis Diseases 0.000 description 1
- 125000000751 azo group Chemical class [*]N=N[*] 0.000 description 1
- 150000001555 benzenes Chemical class 0.000 description 1
- 230000036952 cancer formation Effects 0.000 description 1
- 231100000504 carcinogenesis Toxicity 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 210000005056 cell body Anatomy 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000002703 mutagenesis Methods 0.000 description 1
- 231100000350 mutagenesis Toxicity 0.000 description 1
- 150000005181 nitrobenzenes Chemical class 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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Classifications
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- 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
-
- 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
- C02F1/72—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
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention provides a method for treating organic wastewater by ozone composite activated carbon nano titanium dioxide, belonging to the technical field of wastewater treatment; aims to solve the problem that organic pollutants which are difficult to degrade in the wastewater can not be completely degraded or removed; the technical scheme is that the method comprises the following steps: s1, feeding the wastewater, the ozone and the hydrogen peroxide into a closed water pool, and aerating the bottom of the water pool to fully mix the hydrogen peroxide with the wastewater; s2: the wastewater in the step 1 passes through a suspended composite activated carbon nano titanium dioxide filler, under the irradiation of ultraviolet light or LED light, the composite activated carbon nano titanium dioxide is used as a photocatalyst, and organic matters in the wastewater are degraded under the synergistic action of ozone and hydrogen peroxide, wherein the composite activated carbon nano titanium dioxide filler is particles which are sintered by activated carbon and titanium dioxide with the particle size of less than 10nm and have the size of 0-1 cm; the invention has the technical effects that the invention can thoroughly degrade the organic nondegradable pollutants in the wastewater, has no secondary pollution, high efficiency and low cost.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a method for treating organic wastewater by using ozone composite activated carbon nano titanium dioxide.
Background
The waste water mainly contains benzene series, nitrobenzene series, halogenated compounds, azo compounds, phenols and other organic nondegradable pollutants, has the three effects of carcinogenesis, teratogenesis and mutagenesis, and is treated by a biochemical method at present, but the organic nondegradable pollutants in the waste water cannot be completely degraded or removed by the biochemical method.
Disclosure of Invention
The invention overcomes the defects of the prior art, provides a method for treating organic wastewater by using ozone composite activated carbon nano titanium dioxide, and aims to solve the problem that organic pollutants which are difficult to degrade in the wastewater cannot be completely degraded or removed.
In order to achieve the above object, the present invention is achieved by the following technical solutions.
The method for treating organic wastewater by using ozone composite activated carbon nano titanium dioxide comprises the following steps:
s1, enabling the wastewater, the ozone and the hydrogen peroxide to enter a closed water tank, arranging a degasser and a tail gas destroyer at the top of the water tank, aerating at the bottom of the water tank to fully mix the hydrogen peroxide, the ozone and the wastewater, and generating hydroxyl radicals under the catalysis of the hydrogen peroxide to degrade organic matters in the wastewater;
s2: the wastewater in the step 1 passes through the suspended composite activated carbon nano titanium dioxide filler, under the irradiation of ultraviolet light or LED light, the composite activated carbon nano titanium dioxide is used as a photocatalyst, and organic matters in the wastewater are degraded under the synergistic action of ozone and hydrogen peroxide, wherein the composite activated carbon nano titanium dioxide filler is particles which are sintered by activated carbon and titanium dioxide with the particle size of less than 10nm and have the size of 0-1 cm.
Further, in the step 2, the composite activated carbon nano titanium dioxide filler is in a suspension state through aeration.
Furthermore, in the step 1, the wastewater and the hydrogen peroxide are aerated and then pass through the ceramic filler, so that the contact area of the wastewater and the hydrogen peroxide is increased.
Further, in step 1, be provided with the breakwater that inclines to pond bottom direction in the pond, be provided with in the pond to the breakwater of pond bottom direction slope for the manger plate, the breakwater is arranged along cell body inner wall circumference and is hourglass hopper-shaped, and waste water gets into follow behind the pond the breakwater encircles the round for abundant aeration makes ozone, hydrogen peroxide solution and waste water intensive mixing.
Further, ozone enters the water tank through the aeration device, hydrogen peroxide enters the water tank through the water distributor, and the water distributor is arranged above the aeration device.
Furthermore, a plurality of layers of graphene blocking nets are arranged in the water tank along the water flow direction, and composite activated carbon nano titanium dioxide filler is filled in a cavity formed by the graphene blocking nets and the inner wall of the tank body of the water tank.
Compared with the prior art, the invention has the advantages that the invention is environment-friendly and has no secondary pollution; the occupied area of the equipment is small; the operation is simple; the oxidizing ability is strong; the operation cost is low. The method comprises the following specific steps:
1) the degradation speed of the organic matters is high, and a good treatment effect can be achieved only by minutes to hours generally;
2) the strong oxidizing compounds are efficiently oxidized without difference, and can treat various organic wastewater which is difficult to degrade;
3) the oxidation reaction condition is mild, the investment is less, the energy consumption is low, and the photocatalytic oxidation reaction can be carried out under the irradiation of ultraviolet light or LED light;
4) the organic matter is thoroughly oxidized, no sludge is generated, and the method is more green and environment-friendly;
5) the organic matter and the heavy metal ions can be treated cooperatively.
Drawings
The invention is further described below with reference to the accompanying drawings;
FIG. 1 is an apparatus for treating organic wastewater using the method of the present invention;
the device comprises a water distributor, a water baffle, a water inlet, a water guide plate, a ceramic filler, a composite activated carbon nano titanium dioxide filler, a water outlet weir, an LED lamp tube, a degasser, a tail gas destructor, a power supply and a water outlet, wherein 1 is an ozone generator, 2 is a hydrogen peroxide storage tank, 3 is a first aeration tube, 4 is a water distributor, 5 is a water baffle, 6 is a water inlet, 7 is a guide plate, 8 is a ceramic filler, 9 is a composite activated carbon nano titanium dioxide filler, 10 is a first blocking net, 11 is a blower, 12 is a second aeration tube, 13 is a water outlet weir, 14.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention is described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.
As shown in figure 1, the device for catalytic oxidation of organic wastewater by using the method of the invention comprises a circular water tank with a closed tank body, a water inlet 6 is arranged at the lower side of the water tank, a water outlet 18 is arranged at the upper side of the water tank, wastewater enters from the lower side of the water tank and is discharged from the upper side of the water tank, a degasser 15 and a tail gas destructor 16 are sequentially arranged at the top of the water tank from bottom to top, the degasser 15 is used for gas-liquid separation, the tail gas destructor 16 is used for destroying tail gas so as to lead the tail gas to reach the standard, a first aeration pipe 3 is laid at the bottom of the water tank, the air inlet of the first aeration pipe 3 is connected with an ozone generator 1 arranged outside the water tank, ozone enters the water tank through the first aeration pipe 3, a water distributor 4 is arranged above the first aeration pipe 3, the water distributor 4 is connected with a hydrogen peroxide storage tank, the water baffle 5 is arranged along the side wall of the pool body in an annular downward inclined mode by taking the axis of the pool body as the center, the water port 6 is arranged below the water baffle and above the water distributor, the water baffle 5 is arranged to prevent wastewater entering the pool from directly flowing upwards, water is enabled to surround a circle along the water baffle 5, the retention time of the water at the bottom of the pool is prolonged, the water is guided to the upper portion of the water distributor 4 and the upper portion of the first aeration pipe 3 to be fully contacted with ozone and hydrogen peroxide, a guide plate 7 is arranged above the water baffle 5, a plurality of holes are formed in the guide plate 7, the guide plate 7 is arranged to shear a water body to form a stable flow, two layers of second blocking nets are transversely arranged above the guide plate 7, ceramic fillers 8 are filled in a cavity formed by the two layers of second blocking nets and the inner wall of the pool body to increase the contact area, two layers of first blocking nets 10 are transversely arranged, the first barrier nets 10 are graphene barrier nets, a second aeration pipe 12 is arranged between the two first barrier nets 10, one end of the second aeration pipe 12 is connected with an air blower 11, a cavity formed by the two first barrier nets 10 and the inner wall of the pond body of the pond is filled with a composite active carbon nano titanium dioxide filler 9, the composite active carbon nano titanium dioxide filler 9 is particles with the size of 0-1cm formed by sintering titanium dioxide with the particle size smaller than 10 nanometers in the process of producing active carbon, the composite active carbon nano titanium dioxide filler 9 is in a suspension state under the aeration action of the second aeration pipe 12, an LED lamp tube 14 is arranged above the composite active carbon nano titanium dioxide filler 9, one end of the LED lamp tube 14 is connected with a power supply 17, the other end of the LED lamp tube is fixedly connected with the side wall of the pond body of the pond, and a water outlet weir 13 is arranged at the position of the pond close to a water outlet, a degasser 15 is positioned above the effluent weir 13.
The method for catalytically oxidizing organic wastewater by using ozone composite activated carbon nano titanium dioxide comprises the following steps:
s1, adding 5-10% of ozone relative to the excessive amount of hydrogen peroxide into the water tank, guiding the wastewater to the upper part of the first aeration pipe 3 under the action of the water baffle 5, fully mixing the hydrogen peroxide, the ozone and the wastewater under the aeration action of the first aeration pipe 3, and generating hydroxyl radicals under the catalysis of the hydrogen peroxide by the ozone for degrading organic matters in the wastewater;
s2: the wastewater in the step 1 sequentially passes through the guide plate 7 and the ceramic filler 8 from bottom to top, so that a steady flow is formed, and the contact area of the wastewater with ozone and hydrogen peroxide is increased;
s3: the wastewater in the step 2 passes through the suspended composite activated carbon nano titanium dioxide filler 9, under the irradiation of LED light, the composite activated carbon nano titanium dioxide is used as a photocatalyst to generate hydroxyl radicals, the activated carbon catalyzes ozone to generate the hydroxyl radicals, the graphene in the graphene barrier net catalyzes ozone to generate the hydroxyl radicals, and the hydroxyl radicals are utilized to degrade organic matters in the wastewater under the synergistic effect of the ozone, hydrogen peroxide and the graphene.
In the invention, because the composite active carbon nano titanium dioxide is formed by sintering the active carbon and the nano titanium dioxide into a whole, the nano titanium dioxide cannot fall off from the active carbon, the loss of the catalyst is reduced, during operation, organic matters in the wastewater are adsorbed by the active carbon, and the nano titanium dioxide generates hydroxyl free radicals under the irradiation of light, so that the organic matters are decomposed.
Hydroxyl free radicals generated by ozone water at the bottom of the water tank under the action of hydrogen peroxide firstly carry out preliminary decomposition on organic matters in the wastewater, and along with the flowing of water from bottom to top, titanium dioxide photocatalytic oxidation, activated carbon catalytic ozone and graphene catalytic ozone are utilized to further decompose the organic matters in the wastewater, so that the organic matters in the wastewater are thoroughly decomposed.
The invention greatly improves the traditional photocatalytic oxidation method and the ozone advanced oxidation method, adopts the nano titanium dioxide and the active carbon to be integrally sintered as the photocatalyst, has quick reaction start, and only needs normal temperature and normal pressure; the light reaction unit, the activated carbon adsorption unit and the catalyst separation unit are reasonably and effectively integrated, a complex reaction system is not required to be designed, and the equipment is simple; the photocatalysis efficiency is greatly improved, the loss of the catalyst is reduced, the dosage of hydrogen peroxide and ozone is reduced, and the operation cost is reduced; meanwhile, the volume of the equipment is effectively reduced, and the occupied area is reduced; the organic matters are oxidized more thoroughly, and the utilization efficiency of the medicament is high; and no waste gas or sludge is generated in the operation process, so that secondary pollution and subsequent treatment cost are avoided.
While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. The method for treating organic wastewater by using ozone composite activated carbon nano titanium dioxide is characterized by comprising the following steps of:
s1, enabling the wastewater, the ozone and the hydrogen peroxide to enter a closed water tank, arranging a degasser and a tail gas destroyer at the top of the water tank, aerating at the bottom of the water tank to fully mix the hydrogen peroxide, the ozone and the wastewater, and generating hydroxyl radicals under the catalysis of the hydrogen peroxide to degrade organic matters in the wastewater;
s2: the wastewater in the step 1 passes through the suspended composite activated carbon nano titanium dioxide filler, under the irradiation of ultraviolet light or LED light, the composite activated carbon nano titanium dioxide is used as a photocatalyst, and organic matters in the wastewater are degraded under the synergistic action of ozone and hydrogen peroxide, wherein the composite activated carbon nano titanium dioxide filler is particles which are sintered by activated carbon and titanium dioxide with the particle size of less than 10nm and have the size of 0-1 cm.
2. The method for treating organic wastewater by using ozone-compounded activated carbon nano titanium dioxide as claimed in claim 1, wherein the method is characterized in that
In step 2, the composite activated carbon nano titanium dioxide filler is in a suspension state through aeration.
3. The method for treating organic wastewater by using the ozone composite activated carbon nano titanium dioxide as claimed in claim 1, wherein in the step 1, the wastewater and hydrogen peroxide are aerated and then pass through a ceramic filler so as to increase the contact area of the wastewater and the hydrogen peroxide.
4. The method for treating organic wastewater by using ozone composite activated carbon nano titanium dioxide as claimed in claim 1, wherein in step 1, a water baffle inclined towards the bottom of the water tank is arranged in the water tank, the water baffle inclined towards the bottom of the water tank is arranged in the water tank and used for retaining water, the water baffle is arranged along the circumferential direction of the inner wall of the tank body to form a funnel shape, and wastewater enters the water tank and then surrounds the water baffle for one circle for sufficient aeration so that ozone, hydrogen peroxide and wastewater are sufficiently mixed.
5. The method for treating organic wastewater by using the ozone composite activated carbon nano titanium dioxide as claimed in claim 1, wherein ozone enters the water tank through the aeration device, and hydrogen peroxide enters the water tank through a water distributor which is arranged above the aeration device.
6. The method for treating organic wastewater by using ozone composite activated carbon nano titanium dioxide as claimed in claim 1, wherein a plurality of graphene blocking nets are arranged in the water tank along the water flow direction, and a cavity formed by the graphene blocking net and the inner wall of the tank body of the water tank is filled with composite activated carbon nano titanium dioxide filler.
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| CN202110106020.7A CN112607845A (en) | 2021-01-26 | 2021-01-26 | Method for treating organic wastewater by using ozone composite activated carbon nano titanium dioxide |
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| CN202110106020.7A CN112607845A (en) | 2021-01-26 | 2021-01-26 | Method for treating organic wastewater by using ozone composite activated carbon nano titanium dioxide |
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