Closed machinery incineration treatment method for half-dry sludge

A treatment method and technology for drying sludge, which can be used in dewatering/drying/concentrating sludge treatment, combustion methods, incinerators, etc., which can solve the problem of difficulty in finding landfill sites, high sludge incineration costs, and high sludge moisture content. problems, to ensure that the calorific value is not lost, the cost of sludge incineration is low, and the pollution is reduced.

Inactive Publication Date: 2011-08-03
HEFEI GUOHUI ENVIRONMENTAL PROTECTION TECH
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Problems solved by technology

In the past, landfill was used to deal with it. However, this method can no longer meet the growing shortage of land resources in our country. In addition, the people's requirements for the living environment are gradually increasing. It is difficult to find a suitable landfill site.
However, the resource utilization technology of composting sludge and returning it to the land is also subject to the factors of my country's sewage pipe network facilities, industry and domestic sewage being treated together, resulting in

Method used

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  • Closed machinery incineration treatment method for half-dry sludge
  • Closed machinery incineration treatment method for half-dry sludge
  • Closed machinery incineration treatment method for half-dry sludge

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Embodiment Construction

[0022] Such as figure 1 Shown, a kind of closed mechanical semi-dry incineration treatment method, it comprises the following steps:

[0023] Step 1, sludge modification, using a modifier to reduce the viscosity of the sludge, the binding force between the sludge and the water in the sludge, and the strength of the sludge particles;

[0024] Step 2, extruding the sludge for dehydration, reducing the water content of the sludge to 75%, and becoming loose granular sludge;

[0025] Step 3, using waste heat to further dry the sludge to reduce the water content of the sludge to 55%;

[0026] Step 4, mixing the sludge and coal with a moisture content of 55% obtained in step 3;

[0027] Step 5, sending the sludge-coal mixture obtained in Step 4 to the boiler for combustion, and its tail gas is dedusted and desulfurized as a waste heat source in Step 2;

[0028] In step six, the slag and coal ash left over from the sludge incineration in step five are used as building materials and...

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Abstract

The invention relates to the technical field of residual sludge treatment after sewage is treated, in particular relates to a sludge incineration treatment method. The closed machinery incineration treatment method for half-dry sludge is characterized by comprising the following steps: step 1, modifying the sludge, the adhesiveness of the sludge, the bonding force of water between the sludge and the sludge and the strength of sludge particles are reduced by utilizing a modifier; step 2, extruding the sludge for dewatering, so that the moisture content of the sludge is reduced to 75%, and the incompact particle-shaped sludge is formed; step 3, further drying the sludge by using waste heat, so that the moisture content of the sludge is reduced to 55%; step 4, mixing the sludge with the moisture content of 55% from the step 3 with coal; step 5, feeding a sludge-coal mixture obtained in the step 4 to a boiler for combustion, dedusting and desulfurizing tail gas to be used as a secondary waste heat source; and step 6, taking slag and coal ash remained by combustion in the step 5 as building materials and additives. The method is low in cost, efficient and environment-friendly.

Description

technical field [0001] The invention relates to a treatment technology for remaining sludge after sewage treatment, in particular to a sludge incineration treatment method. Background technique [0002] With the development of my country's national economy, my country's sewage treatment rate is increasing year by year, and the resulting sludge disposal problem has become a headache for many local governments and many experts. Since sludge is solid waste "excreta" produced by the sewage treatment system, it has the characteristics of high moisture content, high organic nutrients, high dry basis calorific value, and high heavy metal content, so it needs to be handled carefully. In the past, landfill was used to deal with it, but this method can no longer meet the growing shortage of land resources in our country. In addition, the people's requirements for the living environment are gradually increasing, and it is difficult to find a suitable landfill site. However, the resour...

Claims

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Application Information

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IPC IPC(8): C02F11/12F23G7/00
CPCY02A50/2351
Inventor 于宁瑞华涵杨淑兵
Owner HEFEI GUOHUI ENVIRONMENTAL PROTECTION TECH
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