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Innocent treatment method and system for domestic sludge

A harmless treatment of domestic sludge, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc., can solve the problem of the reduction of the calorific value of wet combustion and the inability to effectively use organic matter , secondary pollution and other issues, to achieve the effect of reducing the difficulty and energy consumption of filter press, facilitating full combustion, reducing difficulty and energy consumption

Pending Publication Date: 2017-12-15
CHONGQING ANGRUIYUE SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Domestic sludge, also known as sewage plant sludge and municipal sludge, is a long-term, stable, and large-scale sludge produced with the increase in urban sewage treatment. It has the following three characteristics: First, it has high organic matter content. Accounting for more than 50% of its dry basis content, it also contains a large amount of nutrients such as nitrogen and phosphorus; second, because the sewage plant also receives some industrial wastewater, the sludge also contains a certain proportion of heavy metal ions and chemical substances, especially Contains a certain amount of harmful chemical substances, such as adsorbable organic halogens, anionic synthetic detergents, etc., and a large number of pathogenic microorganisms; third, the water content is high, and dehydration is difficult. The water content of domestic sludge produced by general sewage treatment plants is between About 80%, the calorific value of wet combustion is obviously reduced, and its organic matter cannot be effectively used
[0003] At present, domestic sludge treatment methods include the following four technologies: 1) landfill technology, which not only causes a large amount of land waste, but also has secondary pollution; 2) aerobic composting, which requires maintenance and drying to evaporate water, and occupies a lot of space. And the conversion time is long, and it will also pollute the environment; 3) incineration, but direct incineration not only has large investment in equipment, high operating costs, but also has the problem of toxic gas emissions such as dioxins, and wastes energy; at present, there is no efficient The technology can solve the harmless treatment of domestic sludge and the recycling of resources

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Examples

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Effect test

Embodiment 1

[0040] A kind of harmless treatment method steps of domestic sludge:

[0041] 1. Dehydration pretreatment

[0042] Step 1: Mix domestic sludge, lime and polyaluminum chloride at a mass ratio of 100:5:3, and dehydrate through a filter to obtain a mud cake with a water content of 60%, where polyaluminum chloride refers to the mass percent concentration 30% aqueous solution of polyaluminum chloride. ;

[0043] Step 2: According to the original mass of the domestic sludge, the biomass carbon powder accounting for 10% of the original mass of the domestic sludge and the bran shell accounting for 5% of the original mass of the domestic sludge are mixed with the mud cake obtained in step 1 to obtain mixed sludge .

[0044] In step 1, when domestic sludge, lime and polyaluminum chloride (PAC) are mixed in a mass ratio of 100:5:3, the viscosity of domestic sludge can be significantly reduced, the dehydration rate can be improved, and it can be mixed with domestic sludge during incine...

Embodiment 2

[0056] A kind of harmless treatment method steps of domestic sludge:

[0057] 1. Dehydration pretreatment

[0058] Step 1: Mix domestic sludge, lime and polyaluminum chloride at a mass ratio of 100:1:6, and dehydrate through a filter to obtain a mud cake with a moisture content of 63%, where polyaluminum chloride refers to the mass percentage concentration 30% polyaluminum chloride aqueous solution;

[0059] Step 2: According to the original mass of domestic sludge, the biomass carbon powder accounting for 5% of the original mass of domestic sludge and the chaff shell accounting for 5% of the original mass of domestic sludge are mixed with the mud cake obtained in step 1 to obtain mixed sludge .

[0060] In step 1, when domestic sludge, lime and polyaluminum chloride (PAC) are mixed in a mass ratio of 100:1:6, the viscosity of domestic sludge can be significantly reduced, the dehydration rate can be increased, and it can be mixed with domestic sludge during incineration. Th...

Embodiment 3

[0072] A kind of harmless treatment method steps of domestic sludge:

[0073] 1. Dehydration pretreatment

[0074] Step 1: Mix domestic sludge, lime and polyaluminum chloride at a mass ratio of 100:10:2, and dehydrate through a filter to obtain a mud cake with a water content of 63%, where polyaluminum chloride refers to the mass percentage concentration 30% polyaluminum chloride aqueous solution;

[0075] Step 2: According to the original mass of domestic sludge, the biomass carbon powder accounting for 10% of the original mass of domestic sludge and the bran shell accounting for 2% of the original mass of domestic sludge are mixed with the mud cake obtained in step 1 to obtain mixed sludge .

[0076] In step 1, when domestic sludge, lime and polyaluminum chloride (PAC) are mixed in a mass ratio of 100:10:2, the viscosity of domestic sludge can be significantly reduced, the dehydration rate can be increased, and it can be mixed with domestic sludge during incineration. The...

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Abstract

The invention belongs to the technical field of treatment of solid wastes and in particular relates to an innocent treatment method and system for domestic sludge. The invention aims to provide an innocent treatment method for domestic sludge. By virtue of a dehydration pretreatment method for performing secondary mixing on the domestic sludge, the innocent treatment of the domestic sludge is realized. In addition, according to the self-developed treatment system of the method, the system is low in construction cost and low in operating cost, and a novel pathway is developed for innocent treatment of the domestic sludge and resource recycling.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, and in particular relates to a harmless treatment method and system for domestic sludge. Background technique [0002] Domestic sludge, also known as sewage plant sludge and municipal sludge, is a long-term, stable, and large-scale sludge produced with the increase in urban sewage treatment. It has the following three characteristics: First, it has high organic matter content. Accounting for more than 50% of its dry basis content, it also contains a large amount of nutrients such as nitrogen and phosphorus; second, because the sewage plant also receives some industrial wastewater, the sludge also contains a certain proportion of heavy metal ions and chemical substances, especially Contains a certain amount of harmful chemical substances, such as adsorbable organic halogens, anionic synthetic detergents, etc., and a large number of pathogenic microorganisms; third, the water content ...

Claims

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Application Information

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IPC IPC(8): C02F11/14C02F11/12F23G7/00F23G5/44
CPCF23G5/44F23G7/001C02F11/122C02F11/14
Inventor 李秉正李一吴汕
Owner CHONGQING ANGRUIYUE SCI & TECH
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