Oxidative degradation process for high concentrated organic wastewater by microwave cooperating with ferrate catalyst

A technology for organic wastewater, oxidative degradation, applied in chemical instruments and methods, oxidized water/sewage treatment, water/sewage multi-stage treatment, etc. Oxidative degradation rate, excellent adsorption capacity, low price effect

Inactive Publication Date: 2008-11-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are still a large amount of toxic organic wastewater in my country's papermaking, printing and dyeing,

Method used

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  • Oxidative degradation process for high concentrated organic wastewater by microwave cooperating with ferrate catalyst
  • Oxidative degradation process for high concentrated organic wastewater by microwave cooperating with ferrate catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: the treatment of printing and dyeing wastewater

[0022] Take reactive brilliant red dye wastewater from a printing and dyeing factory, the initial CODc of wastewater r 140mg / L, chromaticity 1200 times, first adjust the pH value of wastewater to 7.0 with calcium hydroxide, remove suspended particles by natural sedimentation, pump into the microwave reaction tank with catalyst manganese ferrite, the amount of manganese ferrite is 10% by weight, and pass into the ozone of 0.001% of the waste water weight, start the microwave launch tube at the same time, the microwave tube is intermittently 0.5 minutes after every 0.5 minutes of opening, and the residence time of the control waste water in the reaction tank is controlled at 30 seconds, and the decolorization rate of the effluent is 100%, COD Cr The removal rate is 85%, and the treated wastewater meets the national discharge standards.

Embodiment 2

[0023] Embodiment 2: Tannery wastewater treatment

[0024] Taking the tannery wastewater from a tannery enterprise, its initial CODc r 4070mg / L, adjust the pH value of the wastewater to 10.0 with calcium carbonate, add 0.1ppm polyacrylamide to flocculate and settle to remove suspended particles, pump it into the microwave reaction tank where the catalyst cobalt ferrite is placed, the amount of cobalt ferrite is the weight of wastewater 0.5% of the waste water, and 0.08% of the weight of the waste water is introduced into the air, and the microwave emission tube is started at the same time. The microwave tube is turned on for 1.5 minutes and then intermittently for 1.5 minutes. The residence time of the waste water in the reaction tank is controlled at 30 minutes, and the effluent COD Cr The removal rate is 90%.

Embodiment 3

[0025] Embodiment 3: papermaking wastewater treatment

[0026] Wastewater from a paper mill, pH=13 before treatment, CODc r It is 2860mg / L, no need to adjust the pH value, add 1ppm polyacrylamide to flocculate and settle to remove suspended particles, pump it into the microwave reaction tank where the catalyst nickel ferrite is placed, the amount of nickel ferrite is 1% of the weight of the wastewater, and pass it into Pure oxygen with 0.005% of the waste water weight, start the microwave emission tube at the same time, the microwave tube is turned on for 1 minute and then pause for 1 minute, control the residence time of the waste water in the reaction tank to 20 minutes, and the effluent COD Cr The removal rate is 80%.

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Abstract

The invention discloses a method for degrading high-concentration organic wastewater through microwave-assisted oxidation of ferrite catalyst. The method comprises the following steps that: the high-concentration organic wastewater or processed high-concentration acid organic wastewater is placed into a rectangular microwave reaction tank for degradation reaction; the wastewater after flocculating settling flows through the reaction tank; the flow velocity of the wastewater is adjusted to control the residence time of the wastewater in the reaction tank to between 30 seconds and 30 minutes; when the wastewater flows through the reaction tank, a microwave launching tube is started for 0.5 to 1.5 minutes and then stopped for 0.5 to 1.5 minutes each time, and air, oxygen or ozone enters into the microwave launching tube; samples are obtained at an inlet and an outlet of the reaction tank; the degradation effect is detected and the wastewater flow rate, the operating time of the microwave launching tube and the flow rate of gas which enters into the microwave launching tube are adjusted so as to make the wastewater exhausted by coming up the standards or recycled. The method has the advantages of mild operating condition, low operating cost, cheap price of catalyst and quickness and high efficiency, and is suitable for catalytic and oxidative degradation of wastewater in the industries such as printing and dyeing, paper making, tanning, printed circuit boards and so on.

Description

technical field [0001] The invention relates to a treatment technology for refractory organic waste water, in particular to a method for oxidizing and degrading high-concentration organic waste water with microwave cooperation with a ferrite catalyst. Background technique [0002] The types and quantities of pollutants entering the environment, especially water bodies, are increasing. The main sources are production wastewater from industries such as papermaking, printing and dyeing, dyes, pharmaceuticals, pesticides, tanning and printing lines. These refractory organic compounds have complex components. If it is not treated or discharged without treatment, it will not only pollute the water body, directly endanger human health, but also poison aquatic animals and plants, destroy the water body and soil ecosystem, and often cause irreversible damage to the environmental ecosystem. [0003] At present, the methods used to treat refractory organic wastewater include adsorption...

Claims

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Application Information

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IPC IPC(8): C02F9/08C02F1/72C02F1/30C02F1/52
Inventor 叶瑛夏枚生陈雪刚吕双双张维睿李秀悌胡秀芳邬黛黛韩沉花姚志通高奇东刘利光
Owner ZHEJIANG UNIV
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