CN112266043A - Method for treating aged landfill leachate through nano titanium dioxide photocatalysis - Google Patents
Method for treating aged landfill leachate through nano titanium dioxide photocatalysis Download PDFInfo
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- CN112266043A CN112266043A CN202010875519.XA CN202010875519A CN112266043A CN 112266043 A CN112266043 A CN 112266043A CN 202010875519 A CN202010875519 A CN 202010875519A CN 112266043 A CN112266043 A CN 112266043A
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- landfill leachate
- titanium dioxide
- nano titanium
- nano
- aged landfill
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- 239000000149 chemical water pollutant Substances 0.000 title claims abstract description 23
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 230000001699 photocatalysis Effects 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000007146 photocatalysis Methods 0.000 title abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 239000011941 photocatalyst Substances 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims abstract description 7
- 229910021642 ultra pure water Inorganic materials 0.000 claims abstract description 7
- 239000012498 ultrapure water Substances 0.000 claims abstract description 7
- 229910052724 xenon Inorganic materials 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 5
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims abstract description 5
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000004202 carbamide Substances 0.000 claims abstract description 4
- 239000002244 precipitate Substances 0.000 claims abstract description 4
- 239000010936 titanium Substances 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 6
- 239000010453 quartz Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000000047 product Substances 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 2
- 230000003068 static effect Effects 0.000 claims 1
- 238000007254 oxidation reaction Methods 0.000 abstract description 5
- 230000003647 oxidation Effects 0.000 abstract description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 abstract description 4
- 238000004140 cleaning Methods 0.000 abstract description 3
- 238000001035 drying Methods 0.000 abstract description 3
- 238000000227 grinding Methods 0.000 abstract description 3
- -1 polytetrafluoroethylene Polymers 0.000 abstract description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 abstract description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 abstract description 3
- 238000003760 magnetic stirring Methods 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 abstract description 2
- 239000007795 chemical reaction product Substances 0.000 abstract 1
- 239000000498 cooling water Substances 0.000 description 2
- 238000013032 photocatalytic reaction Methods 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- PDWBGRKARJFJGI-UHFFFAOYSA-N 2-phenylcyclohexa-2,4-dien-1-one Chemical compound O=C1CC=CC=C1C1=CC=CC=C1 PDWBGRKARJFJGI-UHFFFAOYSA-N 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Images
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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/063—Titanium; Oxides or hydroxides thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
-
- 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
- C02F2305/10—Photocatalysts
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Catalysts (AREA)
Abstract
The invention discloses a method for treating aged landfill leachate by nano titanium dioxide photocatalysis. Adding photocatalyst nano titanium dioxide into the aged landfill leachate, and carrying out photocatalytic oxidation reaction under the action of magnetic stirring and a xenon lamp, so that the aged landfill leachate is treated. Wherein the preparation of the photocatalyst adopts a hydrothermal method to prepare Ti (SO)4)2And urea were dissolved in 70ml of ultrapure water, heated to dissolve, and then magnetically stirred for 20min to mix the solution uniformly. Then the solution is moved into a reaction kettle with a polytetrafluoroethylene lining, is strictly sealed, and is kept hot in an oven for 12 hours at a certain temperature. Cooling, centrifuging and cleaning the precipitate for 3 times, and cooling to 80 deg.CCompletely drying, grinding the reaction product to obtain the nano TiO2And (3) powder. The method can utilize a xenon lamp to carry out photocatalytic oxidation treatment on the aged landfill leachate with poor biodegradability, and is simple, feasible, economic and effective, and has small secondary pollution.
Description
Technical Field
The invention belongs to the field of environmental protection and photocatalysis, and particularly relates to a method for treating aged landfill leachate by nano titanium dioxide photocatalysis.
Background
Leachate generated in a landfill is high-concentration organic wastewater, has strong and durable toxicity, contains a large amount of organic matters which are difficult to biodegrade, and is likely to become a pollution source due to the fact that the leachate permeates surface water if the landfill leachate is not collected and treated properly. The biological method is the most common method for treating the landfill leachate at present. However, as the landfill time is prolonged, the content of biodegradable organic matters in the leachate is gradually reduced, the content of difficultly biodegradable organic matters is accumulated, and the concentration of pollutants cannot be further reduced. Research in recent years shows that the photocatalytic oxidation method can effectively and thoroughly decompose organic pollutants into CO2And inorganic matters, so the photocatalytic oxidation method is widely applied to the subsequent advanced treatment and the like of toxic and difficultly biodegradable sewage. TiO 22The photocatalyst is the most widely used photocatalyst which is reported at the earliest time, has the advantages of low price, no toxicity, long-term use and the like, and is one of the most successful photocatalysts at present.
Disclosure of Invention
The invention aims to provide a method for treating aged landfill leachate by nano titanium dioxide photocatalysis.
The idea of the invention is as follows: old landfill leachate is a difficult problem for landfill management at present due to the characteristics of poor biodegradability, complex components and the like. Photocatalytic oxidation is considered to be an environment-friendly new technology with good development prospect at present, and can efficiently degrade various refractory substances. The method of the invention prepares the nano titanium dioxide by a hydrothermal method, so that the nano titanium dioxide can treat aged landfill leachate under the condition of simulating sunlight.
The method comprises the following specific steps:
(1) adding 1mol/L of Ti (SO)4)2Dissolving urea in 70ml ultrapure water, heating to dissolve, magnetically stirring for 20min, and transferring the solution to polytetrafluoroethylene liningAnd (4) strictly sealing the reaction kettle. Carrying out hydrothermal reaction for 12h in an oven at 150 ℃, cooling, then centrifugally separating the precipitate, centrifugally cleaning for three times by using ultrapure water, completely drying at 80 ℃, and grinding the product to obtain the nano titanium dioxide powder.
(2) And (2) pouring 0.2g of the photocatalyst nano titanium dioxide powder prepared in the step (1) into a quartz test tube containing 50ml of old landfill leachate, reacting for 12 hours under a xenon lamp, stirring by a rotor and a magnetic stirrer, and standing and precipitating after the reaction is finished, so that the old landfill leachate is treated by nano titanium dioxide photocatalysis.
The method has the advantages that:
the method for treating the aged landfill leachate by utilizing the nano titanium dioxide through photocatalysis is economic and effective, is simple to operate, reduces the treatment cost of the landfill leachate, and realizes the photocatalytic treatment of the aged landfill leachate with poor biodegradability.
Drawings
FIG. 1 is a schematic view of the structure of an apparatus used in the embodiment of the present invention.
The labels in the figure are: 1-a main chassis; 2-xenon lamp power supply; 3-double-layer quartz cold trap; 4-xenon lamp; 5-Quartz reaction tube (50 ml); 6-eight-position magnetic stirrers; 7-cooling water inlet; 8-a cooling water outlet; 9-cryostat.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
Example (b):
(1) adding 1mol/L of Ti (SO)4)2And dissolving urea in 70ml of ultrapure water, heating to dissolve, magnetically stirring for 20min, transferring the solution to a reaction kettle with a polytetrafluoroethylene lining, and strictly sealing. Carrying out hydrothermal reaction for 12h in an oven at 150 ℃, cooling, then centrifugally separating the precipitate, centrifugally cleaning for three times by using ultrapure water, completely drying at 80 ℃, and grinding the product to obtain the nano titanium dioxide powder.
(2) Thus, the preparation of the photocatalyst nano-titania used in the present example was completed.
(3) The nanometer titanium dioxide photocatalysis treatment of old landfill leachate comprises the following steps: 0.2g of nano titanium dioxide powder is poured into a quartz test tube 5 containing 50ml of old landfill leachate, photocatalytic reaction is carried out under a xenon lamp 4, stirring is carried out through a magnetic stirrer 6, and standing and precipitation are carried out after the reaction is finished.
In this example, the reaction time was 12 hours, and the magnetic stirring speed, temperature (25 ℃) and light intensity (500W) were kept the same throughout. The change situation of the COD concentration in each time period is shown in Table 1, after 2 hours of reaction, the removal rate of the COD is 74.24 percent, the concentration of the effluent percolate is 69.39mg/L, and the discharge requirement of the pollution control standard of the domestic refuse landfill is met. The invention can realize the photocatalysis of the nano titanium dioxide to quickly and effectively treat the aged landfill leachate.
TABLE 1 COD concentration as a function of photocatalytic reaction time
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010875519.XA CN112266043A (en) | 2020-08-27 | 2020-08-27 | Method for treating aged landfill leachate through nano titanium dioxide photocatalysis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010875519.XA CN112266043A (en) | 2020-08-27 | 2020-08-27 | Method for treating aged landfill leachate through nano titanium dioxide photocatalysis |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112266043A true CN112266043A (en) | 2021-01-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010875519.XA Pending CN112266043A (en) | 2020-08-27 | 2020-08-27 | Method for treating aged landfill leachate through nano titanium dioxide photocatalysis |
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| CN (1) | CN112266043A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101696032A (en) * | 2009-10-29 | 2010-04-21 | 彩虹集团公司 | Method for preparing chromium and nitrogen co-doping nano-titanium dioxide powders |
| CN104888834A (en) * | 2015-05-19 | 2015-09-09 | 华北电力大学 | A flat-plate type catalyst for photodegradation of household garbage leachate and a preparing method thereof |
| CN110304682A (en) * | 2019-06-22 | 2019-10-08 | 桂林理工大学 | A method for photocatalytic treatment of old landfill leachate under sunlight |
| CN111039320A (en) * | 2019-12-20 | 2020-04-21 | 成都理工大学 | A kind of dickite-supported nano-TiO2 composite anti-ultraviolet agent and preparation technology thereof |
-
2020
- 2020-08-27 CN CN202010875519.XA patent/CN112266043A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101696032A (en) * | 2009-10-29 | 2010-04-21 | 彩虹集团公司 | Method for preparing chromium and nitrogen co-doping nano-titanium dioxide powders |
| CN104888834A (en) * | 2015-05-19 | 2015-09-09 | 华北电力大学 | A flat-plate type catalyst for photodegradation of household garbage leachate and a preparing method thereof |
| CN110304682A (en) * | 2019-06-22 | 2019-10-08 | 桂林理工大学 | A method for photocatalytic treatment of old landfill leachate under sunlight |
| CN111039320A (en) * | 2019-12-20 | 2020-04-21 | 成都理工大学 | A kind of dickite-supported nano-TiO2 composite anti-ultraviolet agent and preparation technology thereof |
Non-Patent Citations (1)
| Title |
|---|
| 闪慧君: ""模拟太阳光下二氧化钛光催化氧化渗滤液的研究"", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
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Application publication date: 20210126 |