Proceedings

OPERATIONAL EXPERIENCES WITH DIRECT, FLASH DRYING TECHNOLOGY FOR RAW SEWAGE SLUDGE

Jane O’Connor, Simon Tilley and Rachel Edgington
Severn Trent Water

(free)

A new drying process is being commissioned at Manton Sewage Treatment Works at Worksop, for Severn Trent Water. This is a direct, pneumatic dryer, the Centridry, and is the first of its kind in the UK. The process combines mechanical dewatering by centrifuge and flash drying of raw sludge in a single process unit, with an evaporation rate of 1,700 kghour-1. The process delivers an enhanced dried product, compliant with The Safe Sludge Matrix, which is pelletised and stored in 1m3 bags for ease of transportation. The process is fitted with a number of safety features to ensure safe operation at all times. This process can ensure that Severn Trent Water’s strategy, of sludge recycling to agricultural land, can be continued into the future.

KEY WORDS Centridry, Centrifuge, Enhanced treatment, Flash Drying, Sewage Sludge.

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