Drying treatment method for municipal sludge

Abstract

The invention relates to a municipal sludge drying treatment method. Including the following steps: a. The dewatered sludge from the sewage plant is mixed with the dried granular sludge with a moisture content below 15% until the moisture content is 45%-50%; b. Add biological dehydration strains in the biological dehydration pool; c. After 10-15 days of biochemical heating reaction, the water content drops below 30%; d. Biologically dehydrated municipal sludge with a moisture content below 30% enters the drying system for drying until the moisture content is below 15%, and part of the finished particles is returned to be mixed with the wet sludge; e. The rest is the final product of municipal reform sludge disposal, which can be used as fuel, soil improver, etc. The beneficial effect of the present invention is that the operating cost is greatly reduced; it is suitable for large-scale sludge disposal, and the daily treatment of wet sludge can reach hundreds of tons; and there are various ways of utilization, such as fuel, fertilizer, soil conditioner, etc., It can be disposed according to the multi-channel disposal of sludge.

Description

technical field [0001] The invention relates to the technical field of environmental protection treatment, in particular to a municipal sludge drying treatment method. Background technique [0002] Sewage treatment using secondary treatment process will produce a large amount of sludge during operation. Sludge contains a large amount of organic matter, pathogenic bacteria, heavy metals and other toxic and harmful substances. At present, treatment equipment for sludge digestion and concentration and dehydration are generally installed in sewage plants. After these treatments, the moisture content of the sludge can be reduced to about 8026, which still contains a large amount of pollutants. If it is not disposed of properly, it is bound to bring serious pollution to the environment. At present, there are several disposal technologies for dewatered sludge in sewage plants in the world: composting, drying, incineration, landfill, melting, etc. Landfill has been gradually ban...

AI Technical Summary

Problems solved by technology

At present, the technology and equipment of direct drying of municipal sludge in developed countries are relatively mature, and the way of resource utilization of its products is also relatively wide. However, the drying method adopts ripening to transfer evaporated water, and the moisture content of municipal sludge is about 80%. Therefore, the operating cost of drying the sludge to the available water content below 1026 is very expensive, and the operating cost of drying each ton of wet sludge is about 200 yuan, which hinders the development of this technology in my country. The most fundamental reason for widespread promotion