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Method and apparatus for treating waste water by microwave photocatalysis

A catalytic treatment, microwave light technology, applied in chemical instruments and methods, illumination water/sewage treatment, water/sewage treatment, etc., can solve the problems of shortening the life of electrodeless lamps, long time required for degradation, and low luminous efficiency, etc. To achieve the effect of improving the photocatalytic degradation efficiency, occupying less floor space and prolonging the service life

Inactive Publication Date: 2005-08-17
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this electrodeless lamp flickers indefinitely when excited by microwaves, the luminous efficiency is not high, the light intensity is small, and it takes a long time to degrade; moreover, the temperature of the electrodeless lamp after being excited can reach 700-1400K. Timely and effective cooling, the excited spectral line will be broadened due to self-absorption, and shorten the life of the electrodeless lamp

Method used

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  • Method and apparatus for treating waste water by microwave photocatalysis
  • Method and apparatus for treating waste water by microwave photocatalysis
  • Method and apparatus for treating waste water by microwave photocatalysis

Examples

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Effect test

Embodiment 1

[0021] Prepare a 50 mg / L m-nitrophenol aqueous solution to simulate phenol-containing wastewater, without needing a grid to remove impurities. After standing still, adjust the pH of the solution to 3-7. The phenol-containing wastewater passes through the flow meter [4] and the pump [5] at a flow rate of 1.5 L / min Enter the 25L waste water reaction chamber [11], the speed is controlled so that the waste water in the waste water reaction chamber [11] stays for 15 to 20 minutes, and the water flow direction is the way of going in and out. The microwave power is 1000W, and the four electrodeless lamps [17] located in the microwave field are excited by the microwave to generate ultraviolet-visible light, and the TiO loaded on the quartz stirrer [13] by the sol-gel method 2 The nanocatalyst is irradiated by ultraviolet-visible light, and at the same time, the quartz agitator [13] is driven by the motor [12] to rotate at a speed of 30 r / m. At this time, the phenolic wastewater solutio...

Embodiment 2

[0023] Prepare 50mg / L Rhodamine-B aqueous solution to simulate dye wastewater, adjust the pH value to 3-7, and after standing still, enter the 25L wastewater reaction chamber at a flow rate of 1L / min through the flow meter [4] and pump [5] [11 ], the speed is controlled so that the wastewater in the reaction chamber stays for 25 to 30 minutes, and the direction of water flow is in the way of going up and down. The microwave power is 1500W, and the 6 electrodeless lamps [17] placed in the reaction chamber are excited by the microwave to generate ultraviolet-visible light, and the quartz stirrer [13] is loaded with Mn / TiO 2 Catalyst, the doping amount is 0.5%, and the quartz stirrer is driven by an external motor [12] to rotate at a speed of 20r / min. The temperature in the waste water reaction chamber is less than 100°C and normal pressure. The rhodamine-B concentration in the wastewater discharged from the wastewater outlet is less than 10mg / L, and the TOC is reduced by 70%. ...

Embodiment 3

[0025] Prepare a 40mg / L bisphenol A aqueous solution to simulate wastewater containing environmental hormones, adjust the pH to 3-7, and after standing still, enter the 25L wastewater reaction chamber [11] at a flow rate of 1L / min through a flow meter [4] and a pump [5]. Control the waste water in the reaction chamber to stay for 25 to 30 minutes, and the direction of water flow is in the way of going up and down. The microwave power is 1500W, and six electrodeless lamps [17] placed in the reaction chamber are excited by microwaves to generate ultraviolet-visible light. Ni / TiO loaded on the quartz stirrer [13] 2 The catalyst (doping amount 0.5%) was irradiated by ultraviolet-visible light, and at the same time, the quartz stirrer was driven by an external motor [12] to rotate at a speed of 20r / min. The temperature in the waste water reaction chamber is less than 100°C and normal pressure. The concentration of bisphenol A in the wastewater discharged from the wastewater outlet...

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Abstract

The present invention discloses waste water treating microwave and light catalyzing method and apparatus. After grille depurating, still standing to deposit and pH regulation, the waste water to be further treated is microwave and light catalyzed in the waste water treating microwave and light catalyzing apparatus. The apparatus includes microwave reaction oven, waste water reaction chamber inside the microwave reaction oven, no-electrode lamp inserted inside the annular fixer on the inner wall of the waste water reaction chamber, and quartz stirrer set inside the waste water reaction chamber with shaft connected to the outer rotating motor. The present invention has prolonged service life of no-electrode lamp, raised photocatalytic degrading efficiency, simple apparatus, low power consumption and other advantages, and the combined microwave effect and photocatalytic oxidizing technology results in high organic matter eliminating rate.

Description

1. Technical field [0001] The invention relates to a method and a device for wastewater treatment, specifically, a method and a device for treating wastewater by using microwaves, microwaves to excite ultraviolet-visible light generated by electrodeless lamps, and loading nanometer catalysts. 2. Background technology [0002] At present, the types and quantities of pollutants entering the environment, especially water bodies, are increasing. Toxic, harmful, tertiary and refractory organic pollutants have seriously threatened the survival of human beings. At present, there are many chemical, physical, and biological methods for eliminating pollution. These methods have shown their own advantages for different types of pollutants and pollution control requirements. However, generally speaking, some traditional treatment technologies can only transfer pollutants and cause serious secondary pollution; some have poor adaptability, and are often powerless when the concentration of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/00C02F1/30
Inventor 洪军孙成钟明刘亚子周芳
Owner NANJING UNIV
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