Detailed explanation of technical steps for drying treatment of lead containing sludge

There are many disposal methods of lead containing sludge drying, which can be mainly divided into: sludge thickening, sludge mechanical dewatering, drying treatment of lead sludge drying machine, comprehensive disposal and utilization (energy utilization, incineration, building materials utilization, extraction of valuable metals, etc.). Next, the ZJN editor will tells us in detail what steps have been taken in the treatment process of lead containing sludge drying.

1. Sludge thickening

After the lead containing wastewater is precipitated in the sedimentation tank, the sludge in the fluidized state is formed. Thickening is to dehydrate the raw sludge and digested sludge in the fluidized state into semi-solid or solid sludge. The purpose of thickening is to solidify the sludge.

2. Mechanical dewatering of sludge

The moisture content of sludge after thickening or digestion is very high. At this time, if the sludge dryer containing lead is directly used for drying treatment, not only the drying time is long, but also the consumption of heat source is relatively large. Therefore, in order to improve the solid content of sludge cake and reduce the occupied area of sludge, many enterprises will do dehydration treatment before drying.

3. Drying treatment of lead containing sludge by dryer

In order to achieve the water content of comprehensive utilization of lead sludge, it needs to be dried by sludge drying machine. This is because the water in sludge includes free water, capillary water and internal bound water. It is easy to remove free water and capillary water by mechanical method, and the content of internal bound water is related to the proportion of microbial cells in sludge, which is difficult to remove by machinery. Therefore, high temperature dehydration method is widely used in the market. But the common high temperature process has some disadvantages, such as large exhaust emissions and high operating costs.

The ZJN company has been committed to the R & D, production and manufacturing of high humidity and high viscosity sludge drying machine for 30 years. With "environmental protection, energy saving and cleaning" as the core, it has continuously innovated, adopted a variety of scientific and reasonable drying processes, and strictly controlled the equipment quality. Interested enterprise users are welcome to visit and consult.