Application scope of electroplating sludge dryer in sludge treatment

A large amount of electroplating sludge is produced in metal processing, which is harmful to the ecological environment and our health in various ways. The principle of sludge disposal is harmless treatment and resource utilization. The basic disposal steps of sludge include sludge pretreatment, sludge drying and sludge final disposal. Sludge drying need to use electroplating sludge dryer equipment, then electroplating sludge dryer in the entire sludge treatment and disposal of what role, let's take a look.

Application scope of electroplating sludge dryer in sludge treatment

1. Sludge pretreatment

Sludge pretreatment includes sludge thickening, sludge dewatering, etc. the electroplating sludge after pretreatment can enter the harmless disposal process. Among them, sludge thickening can be divided into gravity thickening, mechanical thickening and air flotation thickening. Its purpose is to improve the solid content of sludge. After thickening, the water content of sludge is still about 97%, which is very large, which is not convenient for transportation and use. Therefore, in order to further reduce the moisture content of sludge, it is necessary to further dewater the sludge by mechanical dewatering equipment, centrifugal dewatering or The moisture content of sludge can be reduced to some extent after dewatering by pressure filter.

2. Sludge drying

Sludge drying requires enterprises to establish electroplating sludge dryer production line. The wet sludge enters the electroplating sludge dryer cylinder and is broken into small particles by the dispersion device. With the rotation of the cylinder, the combined lifting plate device set in the cylinder continuously lifts and scatters the sludge particles, forming a uniform material curtain in the whole drying chamber space. Through direct contact between the hot air and the curtain, the heat and mass transfer effect is accelerated. The material moves forward under the hot air flow, and is dried through 1-stage forward flow, 2-stage counter current and 3-stage mixed flow. The hot-air and material are transferred from the inner cylinder to the outer cylinder, and discharged from the discharge port after complete drying.

The moisture content of materials dried by electroplating sludge dryer can reduce the required standard, and the corresponding volume is also greatly reduced. The properties of the finished products are relatively stable, without odor, and the microorganisms and bacteria in the sludge are basically eliminated, which effectively realizes the purpose of harmless and reduction of sludge disposal.

3. Final disposal of sludge

The final disposal of sludge mainly includes incineration, landfill and physicochemical treatment, among which incineration, landfill, agricultural fertilizer utilization, chemical raw materials utilization, building materials utilization, power plant power generation, etc. electroplating sludge can also recover heavy metal elements. In short, enterprises can choose their own sludge disposal methods.