Solidification and desiccation process of sludge

Abstract

The invention discloses a sludge solidification and drying process. The specific steps are as follows: 1) put the raw sludge into a stirring dryer, and add 5% solidifying agent of the input amount of the raw sludge; 2) set the temperature of the stirring dryer 80-160°C, stirring for 2-3 hours to obtain granular sludge with a water content reduced to no more than 40%. The solidification and drying process of sludge disclosed in the technical solution of the present invention adopts chemical modification and solidification, plus low-temperature drying to treat sludge, which can effectively improve the efficiency of sludge drying. It has changed and has the characteristics of ordinary soil, and it will not reverse into sludge when it meets water. Due to the use of low-temperature drying, the stench produced by high temperature and the harmful gas such as dioxin produced by high-temperature incineration are avoided.

Description

technical field [0001] The invention relates to a solidification and drying process of sludge, in particular to a treatment process and method for modification, solidification and drying of municipal sewage sludge. It belongs to the field of sludge treatment. Background technique [0002] With the construction of a large number of urban sewage treatment plants, the volume of sewage treatment and sludge production are increasing. Sludge is a high-moisture porous medium substance with complex components. In addition to containing a large amount of water, there are also bacterial micelles formed by various microorganisms and aggregates composed of organic and inorganic substances adsorbed, organic substances, pathogenic microorganisms, and heavy metals. , salt etc. Even though the sludge has been filtered, it still contains more than 80% water. The high water content brings great difficulties to the later disposal and utilization. If it is not disposed of properly, it will ca...

AI Technical Summary

Problems solved by technology

Due to the high moisture content of sludge, poor soil mechanical properties, and high pollutant content, the current treatment methods often cause environmental pollution, high treatment costs, and also easily cause landfill engineering geological disasters

Sludge can be solidified to change its physical properties and improve its physical and mechanical properties. However, the curing period is long and the working environment is poor. When it rains, the storage yard and mixing plant will not be able to work.

If simple drying is used, the energy consumption is high and the production capacity is very low, and the dried sludge may be reduced to sludge with poor properties after being exposed to water.