Conference Papers | 2009 Conference Papers

THERMAL DRYING OF BIOSOLIDS

Gareth Knight, Operator, United Water
Ronald Crafter, Plant Manager, United Water

DOWNLOAD FULL PAPER (pdf 555 kb)

ABSTRACT

A thermal biosolid dryer has been installed at the Ballarat North Water Reclamation Plant (BNWRP). The BNWRP was constructed in 2007 and is designed for 8.4ML/d of combined industrial wastewater and domestic sewage. There are no sludge digestion facilities and Waste Activated Sludge (WAS) is discharged direct to a thickening centrifuge which produces a 3% dry solid sludge. Dewatering centrifuges then dewater the sludge to 18% dry solids which is the feed material for the thermal dryer. The dryer uses natural gas as the fuel for a rotating drum kiln. Biosolids are dried from 18% dry solids to 92% dry solids and approximately 80T per month of dry pelletised biosolids are produced for reuse.

KEY WORDS

Biosolids, Centrifuge, CHW, Sludge, Thermal Dryer, WAS