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Performance of Anaerobic Digesters fed with Mechanically Disintegrated Excess Activated Sludge

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The volatile solids reduction and the gas production in an anaerobic digester on a large scale pilot plant was increased by mechanically disintegrating excess activated sludge. Thus, it was shown that by applying mechanical disintegration the digestion time can be reduced down to 5 days while still achieving a sufficient volatile solids reduction. On the other hand, using disintegration at digestion times less than 10 days results in an increased sensitivity of the anaerobic digestion process to changes in the feed sludge or to shock loading. When feed excess activated sludge was suddenly changed from disintegrated to untreated, a rise of volatile acids concentration and reduced methane production was observed. The extent of the changes depended very much on the digestion time. Furthermore the effects of a doubling of the feeding rate for a period of 5 days was investigated. Here similar effects could be monitored. The appropriate choice of the digestion time is therefore considered important when applying mechanical disintegration on a full scale level.

Document Type: Research Article


Publication date: 2000-01-01

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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