Ozone-hydroxyl free radical combined catalytic oxidation sludge conditioning method

A technology of catalytic oxidation and sludge conditioning, which is applied in the direction of oxidation treatment of sludge, sludge treatment, chemical instruments and methods, etc., can solve the problems of system processing capacity reduction, heavy labor of adding chemicals, damage to mountains, etc., and achieve moisture content Stable up to the standard, smooth sludge dewatering, and reduced usage

Active Publication Date: 2017-01-25
陕西鼎益源投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) Changing the conditioning system leads to a reduction in the processing capacity of the system. First, the conditioning process takes a long time, resulting in a longer cycle of a dehydration plate. Second, the lime used in the conditioning increases the amount of sludge and the effective treatment capacity. reduce;
[0007] (2) The amount of dosing is large, the incident of counterfeit medicine is relatively long, and the workload of dosing is relatively large;
[0008] (3) The amount of lime added to Indonesian sludge is 25-35%, which leads to high post-processing and transportation costs. The specificity of lime makes it difficult to add. The workplace is dusty and the work intensity is high. At the sa

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] An ozone-hydroxyl radical combined catalytic oxidation sludge conditioning method includes the following steps:

[0030] (1) Put the sludge with a moisture content of 92% in the first reaction tank, add a 30% mass concentration of 30% ferrous sulfate heptahydrate and sulfamic acid mixed solution relative to the dry weight of the sludge, and the mixer 200r Stir uniformly per minute, and perform a mixing reaction. After the reaction, the pH of the sludge is 5.5; the preparation method of the mixed solution of ferrous sulfate heptahydrate and sulfamic acid is: press 10: Mix at a weight ratio of 0.5, add water to prepare a solution with a mass concentration of 30%;

[0031] (2) Place the reaction product of step (1) in the second reaction tank, add a 27% liquid hydrogen peroxide solution with a mass concentration of 3% relative to the dry weight of the sludge, and stir evenly with a stirrer at 200r / min to perform a mixed reaction;

[0032] (3) Step (2) The product after the react...

Embodiment 2

[0035] An ozone-hydroxyl radical combined catalytic oxidation sludge conditioning method includes the following steps:

[0036] (1) Put the sludge with a water content of 95.75% in the first reaction tank, and add a mixed solution of 30% ferrous sulfate heptahydrate and sulfamic acid with a mass concentration of 50% relative to the dry weight of the sludge. Mixer 275r Stir evenly per minute to perform a mixing reaction. After the reaction, the pH of the sludge is 4.5; the preparation method of the mixed solution of ferrous sulfate heptahydrate and sulfamic acid is as follows: : Mix with a weight ratio of 0.75, add water to prepare a solution with a mass concentration of 30%;

[0037] (2) Place the reaction product of step (1) in the second reaction tank, add a liquid hydrogen peroxide solution with a mass concentration of 28.5% relative to 5% of the dry weight of the sludge, and stir evenly with a mixer at 275r / min to perform a mixing reaction;

[0038] (3) Step (2) The product afte...

Embodiment 3

[0041] An ozone-hydroxyl radical combined catalytic oxidation sludge conditioning method includes the following steps:

[0042] (1) Put the sludge with a water content of 99.5% in the first reaction tank, add a mixed solution of 30% ferrous sulfate heptahydrate and sulfamic acid with a mass concentration of 66.7% relative to the dry weight of the sludge, blender 350r Stir evenly per minute to perform a mixing reaction. After the reaction, the pH of the sludge is 5.5; the preparation method of the mixed solution of ferrous sulfate heptahydrate and sulfamic acid is as follows: :1 weight ratio mix, add water to prepare a solution with a mass concentration of 30%;

[0043] (2) Place the reaction product of step (1) in the second reaction tank, add a 30% liquid hydrogen peroxide solution with a mass concentration of 7% relative to the dry weight of the sludge, and stir evenly with a stirrer at 350r / min to perform a mixed reaction;

[0044] (3) Step (2) The product after the reaction ente...

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PUM

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Abstract

The invention discloses an ozone-hydroxyl free radical combined catalytic oxidation sludge conditioning method. The method includes following steps: adding sludge with water content of 92-99.5% into a mixed solution of ferrous sulfate heptahydrate and sulfamic acid for mixing reaction; adding a liquid-state hydrogen peroxide for mixing reaction; enabling a product after reaction to enter a reinforced reaction tank for aeration treatment to realize sludge oxidation wall breaking, wherein gas is generated by a low-temperature plasma reactor and contains ozone and hydroxyl free radicals and free electrons; enabling a sludge product after treatment to enter a plate-and-frame filter press for press filtering to obtain a sludge cake with water content of 50-62%. The hydroxyl free radicals generated by a sludge conditioning agent used in the method has good oxidizing performance and can damage extracellular polymeric substance and cell walls, bound water bound in the sludge is released to be free water, and the existence form of water in the sludge is changed; a water filtering passage in the dewatering process of the sludge is built, so that dewatering of the sludge is smoother, and the water content of the sludge cake is ensured to stably reach standards. An aeration system in the reaction tank can further realize sludge oxidation wall-breaking effect, so that consumption of the two agents is lowered.

Description

Technical field [0001] The present invention relates to the technical field of sludge treatment, in particular to a method for conditioning sludge by combined catalytic oxidation of ozone and hydroxyl radicals. Background technique [0002] Sludge is a solid-liquid mixture, and its solid-liquid ratio is relatively stable without external intervention. The sludge is easy to decompose and odor, with finer particles, small specific gravity (about 1.02-1.06), high water content and not easy to dehydrate, and is a hydrophilic substance with a gel-pack structure. [0003] The characteristics of sludge from municipal wastewater treatment plants in my country are: 1) large amount of sludge, large scale of wastewater treatment plant, and concentrated sludge production; 2) low organic matter content and large sediment content; 3) large differences in sludge quality in different regions. As of 2015, the national sewage treatment volume was 78.4 billion tons, and the sludge production volume ...

Claims

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Application Information

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IPC IPC(8): C02F11/06C02F11/12
CPCC02F11/06C02F11/122
Inventor 张庆丰王士珩
Owner 陕西鼎益源投资有限公司
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