Why is sludge dried?
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Wastewater sludge is dried to minimize its mass and to save sludge hauling and disposal costs. Handling and storage of dried sludge is easy and all further disposal and utilization methods are possible. The dried product can be used as fertilizer and as well as fuel - its caloric value is similar to that of brown coal.
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Eliminating the water from the sludge by evaporation reduces its volume and weight, making for easier storage and transportation. Drying stabilises the sludge, thereby reducing olfactory nuisances and improving sanitization. By evaporating the water, the end product can be prepared for use in a composting facility.
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