Main structure was of sludge drying field, separated by embankments around and piece of ground, if the permeability of the soil, you can put a thin layer of gravel and sand, and plastic drain pipe. Rely on infiltration and evaporation reduces the exile arrived at the scene on the water content of the sludge. About 2-3 days to complete the process of infiltration, can reduce the moisture content to 85%. Since then mainly depends on the evaporation, be reduced to 75% after a few weeks or so. Dehydration of sludge drying field effects, effects of local rainfall, evaporation, temperature, humidity, etc. Generally suitable for dry, less rainfall, sandy soil areas.