Closed machinery incineration treatment method for half-dry sludge

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...

AI Technical Summary

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 the sludge components produced by most sewage plants. Limitations of using this technique

The sludge incineration treatment technology that has received wide attention, due to the high moisture content and high viscosity of the sludge from the sewage treatment plant, has caused the high cost of sludge incineration and the small processing capacity, which makes sludge incineration subject to There is a lot of resistance; in addition, the public has many doubts about the impact of sludge incineration on the environment

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