Abstract
Piggery slurries treated in pilot-scale aeration vessels were sieved or centrifuged to remove a proportion of the solids. The resulting liquid fractions were stored at 10°C; at intervals samples were removed and analysed for volatile fatty acid (VFA) content. Removal of solids using fine sieves or the decanting centrifuge extended the storage times by one-third before the VFA level indicated that offensive odours had returned to the slurries. A laboratory centrifuge tripled the stable-storage period.
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