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A kind of 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: 2019-03-15
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 same time, the lime industry It belongs to the state-restricted industry. The production of lime consumes a lot of energy and damages the mountain. It is foreseeable that its price will become higher and higher;
[0009] (4) Ferric chloride is highly corrosive to equipment and pipelines, and will also cause a certain degree of sludge increase;
[0010] (5) The addition of PAM and lime can easily cause blockage of the filter cloth, affecting its water permeability and service life, while increasing the frequency of cleaning, and the work is labor-intensive;
[0011] (6) Due to the large amount of lime used in sludge conditioning, its subsequent disposal and resource utilization are limited
[0012] (7) Higher operating costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of ozone-hydroxy radical combined catalytic oxidation sludge conditioning method, comprises the following steps:

[0030] (1) Place the sludge with a moisture content of 92% in the first reaction tank, add a mixed solution of 30% ferrous sulfate heptahydrate and sulfamic acid with respect to the mass concentration of 33.3% of the sludge dry weight, stirrer 200r / min is stirred evenly, carries out mixed reaction, and the pH of sludge after the reaction is 5.5; The preparation method of the mixed solution of described ferrous sulfate heptahydrate and sulfamic acid is: ferrous sulfate heptahydrate and sulfamic acid are pressed 10: Mix at a weight ratio of 0.5, add water to prepare a solution with a mass concentration of 30%;

[0031] (2) The reaction product of step (1) is placed in the second reaction tank, adding a liquid hydrogen peroxide solution with a mass concentration of 3% relative to the dry weight of the sludge is 27%, and the mixer is stirred at 200r / min...

Embodiment 2

[0035] A kind of ozone-hydroxy radical combined catalytic oxidation sludge conditioning method, comprises the following steps:

[0036] (1) Place the sludge with a moisture content of 95.75% in the first reaction tank, add a mixed solution of 30% ferrous sulfate heptahydrate and sulfamic acid relative to the mass concentration of 50% of the dry weight of the sludge, and stirrer 275r / min stirs evenly, carries out mixed reaction, and the pH value of sludge after the reaction is 4.5; : mix at a weight ratio of 0.75, add water to be mixed with a solution whose mass concentration is 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 5% relative to the dry weight of the sludge that is 28.5%, stir evenly with a mixer at 275r / min, and perform a mixed reaction;

[0038] (3) The product after the reaction in step (2) enters the enhanced reaction tank, and an aeration system is provi...

Embodiment 3

[0041] A kind of ozone-hydroxy radical combined catalytic oxidation sludge conditioning method, comprises the following steps:

[0042] (1) Place the sludge with a moisture content of 99.5% in the first reaction tank, add a mixed solution of 30% ferrous sulfate heptahydrate and sulfamic acid with respect to the mass concentration of 66.7% of the dry weight of the sludge, and stirrer 350r / min stirs evenly, carries out mixed reaction, and the pH value of sludge after the reaction is 5.5; : mix in a weight ratio of 1, add water to be mixed with a solution whose mass concentration is 30%;

[0043] (2) The reaction product of step (1) is placed in the second reaction tank, adding a liquid hydrogen peroxide solution with a mass concentration of 7% relative to the dry weight of the sludge is 30%, and the mixer is stirred at 350r / min to perform a mixed reaction;

[0044] (3) The product after the reaction in step (2) enters the enhanced reaction tank, and an aeration system is provide...

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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 invention relates to the technical field of sludge treatment, in particular to an ozone-hydroxyl radical combined catalytic oxidation sludge conditioning method. Background technique [0002] Sludge is a solid-liquid mixture, and its solid-liquid ratio is relatively stable without external force intervention. The nature of sludge is easy to rot and smell, with fine particles, small specific gravity (about 1.02-1.06), high water content and not easy to dehydrate, which is a hydrophilic substance with glue-packed structure. [0003] The characteristics of municipal sewage plant sludge in my country are: 1) large amount of sludge, large scale of sewage plant, and concentrated sludge production; 2) low organic matter content and large sediment content; 3) large differences in mud quality in different regions. As of 2015, the national sewage treatment volume was 78.4 billion tons, and the sludge production volume was 34 million tons (water content 80%)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/06C02F11/143
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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