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A method for advanced treatment of biochemical tail water in a Fenton fluidized bed

An advanced treatment, fluidized bed technology, applied in the direction of oxidized water/sewage treatment, etc., can solve the problems of a small amount of iron sludge and the utilization rate of chemicals is not maximized, so as to achieve less iron sludge production, saving acid and alkali adjustment, The effect of good wastewater treatment effect

Active Publication Date: 2016-04-27
NANJING UNIV +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems in the prior art of fluidized bed Fenton technology for biochemical tail water treatment, such as acid-base adjustment, a small amount of iron sludge, the utilization rate of the chemical agent is not maximized, and regular slag discharge, etc., the present invention proposes a Fenton fluidized bed depth The method of treating biochemical tail water, it can make full use of the heterogeneous catalytic performance of the loaded filler, improve the utilization rate of chemicals, reduce the consumption of acid and alkali, basically eliminate the generation of iron sludge, and realize "zero slag discharge", which is especially suitable for Improved Fenton fluidized bed advanced wastewater treatment method for treating biochemical tail water with COD<150mg / L

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  • A method for advanced treatment of biochemical tail water in a Fenton fluidized bed
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  • A method for advanced treatment of biochemical tail water in a Fenton fluidized bed

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Embodiment 1

[0032] A method for advanced treatment of biochemical tail water in a Fenton fluidized bed, the steps of which are:

[0033] (1) Add 80g / L yellow sand with a particle size of 0.2mm in the fluidized bed;

[0034] (2) Adjust the pH of the influent to 6.0, control the influent flow rate, and keep the residence time in the fluidized bed at 30 minutes;

[0035] (3) Control the rising velocity of the liquid in the fluidized bed to be 30m / h by returning the water outlet part from the top of the fluidized bed to the bottom, and add hydrogen peroxide and ferrous sulfate solution in the fluidized bed to react respectively, and the dosage of hydrogen peroxide is 2mM, the hydrogen peroxide with a mass fraction of 30% was diluted 10 times before adding, and the dosage of ferrous sulfate in the crystal growth stage was 100mg / L;

[0036] (4) Maintain conditions (1)-(3), and run continuously for 2 weeks to carry out crystal growth on the filler surface (crystal growth stage);

[0037] (5) A...

Embodiment 2

[0044] A method for advanced treatment of biochemical tail water in a Fenton fluidized bed, the steps of which are:

[0045] (1) Add 100g / L quartz sand with a particle size of 0.4mm in the fluidized bed;

[0046](2) Adjust the pH of the influent to 5.0, control the influent flow, and keep the residence time in the fluidized bed at 45 minutes;

[0047] (3) Control the ascending flow rate of the liquid in the fluidized bed to 50m / h by returning the water outlet part from the top of the fluidized bed to the bottom, and add hydrogen peroxide and ferrous sulfate solution in the fluidized bed to react, and the dosage of hydrogen peroxide is 5mM, the hydrogen peroxide with a mass fraction of 30% was diluted 10 times before adding, and the dosage of ferrous sulfate in the crystal growth stage was 200mg / L;

[0048] (4) Maintain conditions (1)-(3), and operate continuously for 3 weeks for crystal growth (crystal growth stage);

[0049] (5) After the crystal growth ends, the pH of the ...

Embodiment 3

[0056] A method for advanced treatment of biochemical tail water in a Fenton fluidized bed, the steps of which are:

[0057] (1) Add 120g / L zeolite in the fluidized bed with a particle size of 0.6mm;

[0058] (2) Adjust the pH of the influent to 4.0, control the influent flow rate, and keep the residence time in the fluidized bed at 60 minutes;

[0059] (3) Control the ascending flow rate of the liquid in the fluidized bed to be 80m / h by returning the water outlet part from the top of the fluidized bed to the bottom, and add hydrogen peroxide and ferrous sulfate solution in the fluidized bed to react, and the dosage of hydrogen peroxide is 10mM, the hydrogen peroxide with a mass fraction of 30% was diluted 10 times before adding, and the dosage of ferrous sulfate in the crystal growth stage was 400mg / L;

[0060] (4) Maintain conditions (1)-(3), and operate continuously for 4 weeks for crystal growth (crystal growth stage);

[0061] (5) After the crystal growth ends, the pH o...

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Abstract

The invention discloses a Fenton fluidized bed biochemical tail water advanced treatment method and belongs to the field of wastewater treatment. The method comprises a crystal growth stage and a biochemical tail water advanced treatment stage; in the crystal growth stage, a Fenton agent is rapidly loaded on the surface of a filler and grow a crystal; in the biochemical tail water advanced treatment stage, the wastewater is oxidized and degraded by prolonging the time of the biochemical tail water staying in the fluidized bed and taking full advantage of the heterogeneous catalytic performance of the crystal growing on the surface of the filler, ferrous sulfate is not added in the treatment process any more, the target of discharging zero slags without producing iron cement or regulating acid-base is achieved, the method is economical, green and environment friendly, available cheap sands are chosen as the filler, the surface charge of the filler is negative and has a very strong combination action on iron oxide with positive charges, the more stable crystal is more rapidly formed, a better wastewater treatment effect is achieved, and the method is recycled, the service life is long, the design is reasonable, and the utilization ratio of the agent is high.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and more specifically relates to a method for advanced treatment of biochemical tail water by a Fenton fluidized bed. Background technique [0002] Industrial wastewater usually has the characteristics of high concentration, high toxicity, and difficulty in biodegradation, which makes it difficult for the wastewater after biological treatment (biochemical tail water) to meet the discharge standards. Studies have shown that industrial biochemical tail water contains: microbial metabolites, organic intermediates, natural organic matter, trace toxic substances, etc., which are difficult to further biochemically degrade and require advanced treatment. Among many advanced treatment technologies, Fenton technology, as an advanced oxidation technology, is widely used because of its low cost, high efficiency and simplicity. However, Fenton's optimal reaction pH (2-4) conditions and the need for ferro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72
Inventor 李爱民沈科双陈冬孙亮李文涛徐子潇
Owner NANJING UNIV
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