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Convective dryers

Convective (or direct) dryers are the most commonly used type of dryer for removing moisture from sewage sludge using heat. The sludge particles are in direct contact with hot gas – air or steam – which provides the heat needed to evaporate the water. They can be configured as conveyer belts (belt dyers), fluidised beds, rotating drums, or flash (pneumatic) dryers. Belt, fluidised bed, rotating drum dryers are the most often used configurations in sewage sludge drying. Since these dryers demand a significant air volume, the air is often recirculated prior to venting to conserve energy.

Convective dryers related videos

Simulation of rotary dryer operation, Dynamis Source: Dynamis /

Simulation of rotary dryer operation, Dynamis

A simulation of rotary dryer operation, produced by Dynamis.

Convective dryers features and blogs

Feature combined hydrothermal carbonization header

Combined hydrothermal carbonization with anaerobic digestion: recycling of the HTC products

Recycling the product streams from a hydrothermal carbonisation process to the anaerobic digester promotes biogas yield in terms of methane volume per unit feed COD, using HTC process conditions of 190 °C and a 1 h reaction time, this research suggests.

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