Method for treating printing and dyeing wastewater through iron-manganese/biochar catalytic ozonation

A technology for ozone catalytic oxidation and printing and dyeing wastewater, applied in the field of sewage treatment, can solve the problems of low COD removal efficiency of printing and dyeing wastewater, difficult recovery of heterogeneous catalysts, unstable treatment effect, etc., and achieve good catalytic activity and stability, and reaction conditions. Easy to control, great effects

Pending Publication Date: 2022-05-24
CHINA JILIANG UNIV
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Problems solved by technology

[0006] However, in the existing technology, there are generally problems such as low COD removal efficiency of printing and dyeing wastewater, slow speed and low efficiency of free radicals generated by catalyst ozone catalysis, and unstable treatment effect, and conventional heterogeneous catalysts are not easy to recycle, which is easy to cause secondary pollution

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  • Method for treating printing and dyeing wastewater through iron-manganese/biochar catalytic ozonation

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Experimental program
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Effect test

Embodiment 1

[0027] At room temperature, the iron-manganese / biochar catalyst is mixed with the printing and dyeing wastewater, stirred until the mixture is evenly mixed, and the ozone gas is introduced into the aeration liquid after mixing, the diameter of the microporous aerator is 3cm, and the amount of ozone is 30mg / L. The volume of printing and dyeing wastewater is 400ml, and the catalytic reaction at room temperature is 0.5h; the ratio of the iron-manganese / biochar catalyst to the printing and dyeing wastewater is 10:1;

[0028] The iron - manganese / biochar preparation method comprises the following steps:

[0029] 1) Preparation of biochar: dry the surface soil and debris with deionized water for 6h, and roast the dried raw materials under nitrogen protection for 2h at a roasting temperature of 755 °C.

[0030] 2) Pretreatment of biochar: The biochar sieving obtained in step 1) is sequentially washed by 2mol / L sulfuric acid pickling and 2mol / L sodium hydroxide alkali washing, rinsed wi...

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Abstract

The invention discloses a method for treating printing and dyeing wastewater through iron-manganese/biochar catalytic ozonation. An adopted catalyst is an iron and manganese supported biochar catalyst. Hybrid samples of iron and manganese oxides are successfully supported and uniformly distributed on the biochar, so that the biochar has efficient catalytic ozone degradation activity. According to the treatment method, effective treatment of the printing and dyeing wastewater is achieved, the organic matter removal rate is high, chromaticity can be effectively removed, raw materials are low in cost and easy to obtain, secondary pollution is avoided, and good economic and social benefits are achieved.

Description

Technical field [0001] The present invention relates to the field of sewage treatment technology, in particular to an ozone-catalyzed oxidation treatment of printing and dyeing wastewater method. Background [0002] With the continuous development of the economy and the increasing number of enterprises, more and more industrial wastewater is directly discharged without meeting the standards, resulting in more and more serious water pollution in China. Industrial wastewater mainly comes from chemical, paper, textile, pharmaceutical and other industries, of which the textile industry is the most rapid development, and its wastewater discharge accounts for about 35% of the total discharge of industrial wastewater. In addition, the development of chemical fiber fabrics and the progress of dyeing and finishing technology have prompted some new additives and slurries to be put into use in large quantities, which has led to an increasing concentration of organic pollutants in printing a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/78B01J23/889C02F103/30
CPCC02F1/725C02F1/78B01J23/8892C02F2103/30C02F2305/02Y02W10/10
Inventor 李金页朱怡溶戚可欣
Owner CHINA JILIANG UNIV
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