Abstract
The operational capabilities of four anaerobic fluidised bed reactors restarted after periods of downtime of 39 and 89 days were determined, together with a profile of biomass activity at steady state through the bed length of two reactors. Full operational performance was retained after the shorter downtime period, but restart required manipulation after the 89-day shutdown due to poor COD removal and high volatile acid production. Biomass activity was greatest in the upper third of the reactors, with attached biomass being more active than suspended.
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