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EGGS OR PANCAKES: A PROCESS COMPARISON

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Foam, grit and sand accumulation in conventional digesters cause operational and maintenance problems by reducing the active volume for digestion, clogging gas mixers, and causing ineffective sludge recirculation and heating. On the other hand, egg-shaped digesters are kept free of grit by a combination of targeted mixing and preventive bottom grit transfers. Foam control has been achieved on the egg-shaped digesters through a novel mixing mode and exercising the foam removal to prevent accumulation. Volatile solids destruction for conventional and egg-shaped digesters is comparable and variations can be fully resolved by changes in hydraulic detention time. On a unit volume basis, egg-shaped digesters have a greater active volume.
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Document Type: Research Article

Publication date: 2001-01-01

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