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Write about methods of sludge drying using unpaved drying beds 1pages

2. Air drying - Sewage sludge is dried on sand beds or on paved or unpaved basins. The sewage sludge dries for a minimum of three months. During two of the three months, the ambient average daily temperature is above zero degrees Celsius. 3

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    Air Drying Sewage sludge is dried on sand beds or on paved or unpaved basins. The sewage sludge dries for a minimum of 3 months. During 2 of the 3 months, the ambient average daily temperature is above 0 C (23 F). Anaerobic Digestion Sewage sludge is treated in the absence of air for a specific mean cell residence time (i.e

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    Aerobic digestion: The process is conducted by agitating sludge with air or oxygen to maintain aerobic conditions at residence times ranging from 60 days at 15 C to 40 days at 20 C, with a volatile solids reduction of at least 38 percent. Air Drying: Liquid sludge is allowed to drain and/or dry on under-drained sand beds, or paved or unpaved basins in which the sludge is at a depth of nine

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