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Catalyst for microwave catalytic degradation of organic wastewater and organic wastewater treatment method

A technology of organic wastewater and microwave catalysis, applied in the direction of oxidized water/sewage treatment, water/sewage treatment, chemical instruments and methods, etc., can solve problems such as time-consuming, inability to degrade pollutants, and failure to meet actual needs, etc., to achieve process parameters Easy control, convenient control of irradiation parameters, and convenient industrial operation

Inactive Publication Date: 2016-11-23
XIANGTAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Organic wastewater has the disadvantages of high toxicity, deep color, complex composition, and difficult biodegradation. Therefore, if these organic wastewater flows into rivers, lakes and seas, it will cause serious pollution of water bodies, which will seriously threaten the lives of human beings and other organisms.
[0004] Many aromatic compounds in industrial wastewater have been listed by the U.S. Environmental Protection Agency as a priority pollutant control list. These pollutants mainly come from industries such as synthetic dyes, pharmaceuticals, petrochemicals, and fine chemicals. Among them, nitrophenol and its derivatives are pollutants It is toxic to the respiratory system and central nervous system, and the biochemical degradation rate is low. The traditional treatment method is difficult to meet the pollutant control requirements. The details are as follows: (1) Physical adsorption method has the defect that the pollutant cannot be degraded fundamentally; ( 2) The biological decolorization method has the defects of long time consumption and the pollutants are difficult to be completely degraded; (3) the ultrasonic degradation method has the defects of long time consumption and low efficiency; (4) the photocatalytic degradation method is only suitable for low chroma and low concentration (5) Microwave-assisted or enhanced photocatalysis has high energy consumption and complex equipment, and has not fundamentally improved the conventional photocatalysis method; (6) Microwave and inorganic oxidant combined Processing method, high processing cost, uneconomical

Method used

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  • Catalyst for microwave catalytic degradation of organic wastewater and organic wastewater treatment method
  • Catalyst for microwave catalytic degradation of organic wastewater and organic wastewater treatment method
  • Catalyst for microwave catalytic degradation of organic wastewater and organic wastewater treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A treatment method for organic wastewater containing nitrophenol, first prepare a certain amount of catalyst, a microwave device, a UV spectrophotometer, a centrifuge and 100mL of organic wastewater containing nitrophenol concentration of 100mg / L .

[0026] The catalyst uses α-Bi 2 o 3 , the preparation method is as follows: after fully grinding bismuth nitrate, roasting at a temperature of 550°C for 5 hours, and then getting the catalyst α-Bi 2 o 3 .

[0027] Step A, mixing 0.1g of the catalyst with organic waste water to obtain a mixed material;

[0028] Step B, put the mixed material obtained in step A into microwave equipment, degrade it under microwave irradiation, and cool to room temperature to obtain the degraded waste liquid, wherein: the power of microwave irradiation is 600 watts, and the time of microwave irradiation for 5min.

[0029] The degraded waste liquid is centrifuged with a centrifuge to obtain the supernatant, and the absorbance of the supern...

Embodiment 2- Embodiment 12

[0037] Embodiment 2-Example 12 differs from Example 1 only in the parameters listed in Table 1, see Table 1 for details, and Example 2-Example 12 is checked by the same detection method as Example 1, and the results are detailed See Table 1.

[0038] Embodiment 1-embodiment 5 is the impact of different catalyst dosages on microwave catalytic treatment of organic waste water, as can be seen from Table 1, when the consumption of catalyst increases from 3g to 7g (treatment contains the organic waste water 100mL of nitrophenol concentration of 100mg / L) , the degradation rate increased from 98.0% to 99.2%. When the amount of catalyst continued to increase, the degradation rate did not increase significantly. The main reason is that a certain microwave quantum density (ie power) can only excite a certain amount of microwave catalyst to generate electron space. hole pairs, so that only a certain amount of pollutants can be degraded. From the consideration of saving cost, the catalys...

Embodiment 3

[0039] Embodiment 3 in conjunction with embodiment 6-embodiment 8 investigated the influence of microwave irradiation time on microwave catalytic treatment of organic wastewater, as can be seen from Table 1, when microwave irradiation time is extended to 7 minutes by 5 minutes, its degradation rate changes little , can be ignored, the main reason for the decrease in the data here may be that the condensed and refluxed reaction solution was not completely refluxed into the reaction system during the 7min reaction, resulting in an increase in the concentration of the reaction system; it may also be a measurement error.

[0040]Embodiment 3 in conjunction with embodiment 9-embodiment 11 investigated the influence of microwave irradiation power on microwave catalytic treatment of organic wastewater, as can be seen from Table 1, 600W and 800W are high power, when other conditions are appropriate, all can reach greater degradation rate, but the difference is not very large. When the...

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Abstract

The invention provides a catalyst for microwave catalytic degradation of organic waste water. The catalyst includes metal oxides, and the metal oxides are metal oxides containing bismuth. The catalyst of the present invention can fully absorb microwaves and be excited to generate electron-hole pairs, and the active oxygen species such as hydroxyl radicals generated by the combination of water molecules in organic wastewater and strong electron-absorbing holes act as oxidants for degradation reactions, realizing Efficient degradation of organic wastewater. The present invention also provides a method for treating organic wastewater, which includes the following steps: step A, mixing the catalyst and organic wastewater evenly; step B, placing it in a microwave device, degrading it under microwave irradiation, and cooling to room temperature to obtain the degradation subsequent waste. The treatment method of the present invention is suitable for all waste water with a nitrophenol concentration of 100-500mg / L, and has strong practicability; the microwave irradiation parameters are convenient to control, the irradiation time is short, and the degradation rate can reach 99.2%, meeting the high efficiency requirement.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a catalyst for microwave catalytic degradation of organic wastewater and a method for treating organic wastewater. Background technique [0002] With the development of industry, environmental pollution is becoming more and more serious, especially water pollution. [0003] Organic wastewater has the disadvantages of high toxicity, deep color, complex composition, and difficult biochemical degradation. Therefore, if these organic wastewater flows into rivers, lakes and seas, it will cause serious pollution of water bodies, which will seriously threaten the lives of human beings and other organisms. [0004] Many aromatic compounds in industrial wastewater have been listed by the U.S. Environmental Protection Agency as a priority pollutant control list. These pollutants mainly come from industries such as synthetic dyes, pharmaceuticals, petrochemicals, and fine chemi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18C02F1/30C02F1/72C01G29/00C02F101/38C02F101/34
CPCB01J23/18C01G29/00C02F1/302C02F1/725C02F2101/34C02F2101/38
Inventor 周继承仇殷徐文涛石妮
Owner XIANGTAN UNIV
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