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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

Example of a flash dryer for drying slurries Source: Hosokawa Micron B.V. / YouTube

Example of a flash dryer for drying slurries

Animation demonstrating the workings of the flash dryer for drying slurries, from Hosokawa Micron B.V.

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Convective dryers features and blogs

HTC/AD integration flowsheet
Feature

Co-processing of sewage digestate by hydrothermal carbonisation

Hydrothermal carbonisation (HTC) can be used to co-process anaerobic digestion (AD) digestate and lignocellulosic (or plant-based) feedstocks to improve the the hydrochar product quality. This AD waste co-processing route has been studied at bench scale.

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