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Method for cracking sludge through ultrasonic coupling Fenton oxidation

An ultrasonic and sludge technology, applied in chemical instruments and methods, water/sludge/sewage treatment, water/sewage multi-stage treatment, etc., can solve the limitation of practical application, high cost of Fenton reagent, no ultrasonic strengthening of sludge Fenton Oxidation treatment research reports and patent applications, etc., to achieve the effect of improving the cracking effect

Active Publication Date: 2012-06-20
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many studies require a large amount of H 2 o 2 , which caused the high cost of Fenton's reagent, which limited the practical application of this technology
[0004] In sewage treatment, the synergistic effect of ultrasonic and Fenton oxidation on the removal of organic matter has been verified, but there are no related research reports and patent applications on ultrasonic enhanced sludge Fenton oxidation treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of ultrasonic coupling Fenton oxidation cracks sludge method, comprises the following steps:

[0021] In the first step, adjust the pH value of the sludge system with 0.1mol / L dilute hydrochloric acid to make the pH value of the sludge system 2.6,

[0022] In the second step, ultrasonic wave and Fenton oxidation are used to break down the sludge system at the same time,

[0023] Ultrasonic frequency is 20kHz, ultrasonic sound energy density is 100W / L;

[0024] The dosage of Fenton's reagent is: add ferrous sulfate solution to make the Fe in the sludge system 2+ The ion concentration range is 0.2g / L, and the added mass fraction is 30% H 2 o 2 The solution makes the H of the sludge system 2 o 2 The concentration range is 0.25g / L,

[0025] In the third step, ultrasonic wave and Fenton oxidation simultaneously decompose the sludge system for 1 hour.

[0026] After the cracking is completed, take 500mL sludge sample and add it to a 2L conical flask, add a magne...

Embodiment 2

[0032] A kind of ultrasonic coupling Fenton oxidation cracks sludge method, comprises the following steps:

[0033] In the first step, adjust the pH value of the sludge system with 0.1mol / L dilute hydrochloric acid to make the pH value of the sludge system 3,

[0034] In the second step, ultrasonic wave and Fenton oxidation are used to break down the sludge system at the same time,

[0035] Ultrasonic frequency is 25kHz, ultrasonic sound energy density is 100W / L;

[0036] The dosage of Fenton's reagent is: add ferrous sulfate solution to make the Fe in the sludge system 2+ The ion concentration range is 0.4g / L, and the added mass fraction is 30% H 2 o 2 The solution makes the H of the sludge system 2 o 2 The concentration range is 0.3g / L,

[0037] In the third step, ultrasonic wave and Fenton oxidation simultaneously decompose the sludge system for 0.5h.

[0038]After the cracking is completed, take 500mL sludge sample and add it to a 2L conical flask, add a magnetic st...

Embodiment 3

[0044] A kind of ultrasonic coupling Fenton oxidation cracks sludge method, comprises the following steps:

[0045] In the first step, adjust the pH value of the sludge system with 0.1mol / L dilute hydrochloric acid to make the pH value of the sludge system 3.4,

[0046] In the second step, ultrasonic wave and Fenton oxidation are used to break down the sludge system at the same time,

[0047] Ultrasonic frequency is 40kHz, ultrasonic sound energy density is 125W / L;

[0048] The dosage of Fenton's reagent is: add ferrous sulfate solution to make the Fe in the sludge system 2+ The ion concentration range is 0.4g / L, and the added mass fraction is 30% H 2 o 2 The solution makes the H of the sludge system 2 o 2 The concentration range is 0.3g / L,

[0049] In the third step, ultrasonic wave and Fenton oxidation simultaneously decompose the sludge system for 0.5h.

[0050] After the cracking is completed, take 500mL sludge sample and add it to a 2L conical flask, add a magnetic...

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Abstract

The invention relates to a method for cracking sludge through ultrasonic coupling Fenton oxidation. Firstly, the pH value of a sludge system is regulated to 2.5 to 3.5 by diluted hydrochloric acid, then, ultrasonic waves and Fenton oxidation are adopted for simultaneously cracking a sludge system, the ultrasonic wave frequency is 20 to 40 kHz, and the ultrasonic sound energy density is 50 to 125 W / L; the simultaneous cracking time of the ultrasonic waves and Fenton oxidation on the sludge system is 0.25 to 1 hour, the sludge cracking effect is improved, and compared with non-enhanced Fenton oxidation treatment, the ultrasonic coupling Fenton oxidation has the advantages that the specific resistance of the sludge and the capillary water absorption time are greatly reduced. The method for cracking sludge through ultrasonic coupling Fenton oxidation has the advantages that the fetor control effect is obvious, and the Fe<2+> addition quantity and the H2O2 addition quantity are greatly reduced, so the treatment cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of solid waste disposal, and in particular relates to an ultrasonic coupling Fenton oxidation method for cracking sludge. Background technique [0002] Researchers at home and abroad have conducted relatively comprehensive research on ultrasonic cracking pretreatment sludge technology. Ultrasonic waves produce instantaneous local high temperature of thousands of degrees, high pressure of hundreds of atmospheres, rapid discharge, ultra-high-speed jets and other extreme environments in water, thereby destroying the structure of sludge bacteria micelles, releasing organic matter and water in them, improving dewatering performance of sludge. Although ultrasonic waves can promote the cracking of the microstructure of sludge, increase the content of organic matter in the supernatant, and benefit the anaerobic digestion of sludge, it has little effect on the improvement of sludge dewatering performance, and it red...

Claims

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Application Information

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IPC IPC(8): C02F9/08
Inventor 蒋建国宫常修杨世辉
Owner TSINGHUA UNIV
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