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Bench testing was conducted to investigate the performance of an auto-heated aerobic digester for stabilizing waste activated sludge from an oxidation ditch activated sludge system for Plover, Wisconsin. Several extended-aeration bench tests where conducted at different temperatures and solids concentrations to estimate the performance of the high solids aerobic digester. Results indicate that vector attraction reduction requirements can be achieved at a detention time/operating temperature of approximately 400°C-days.

Design of the new aerobic digesters considered pre-thickening waste activated sludge to 5° solids concentration ahead of aerobic digestion. Pre-thickening reduces process volume requirements and increases operating temperature due to auto-heating of the digesting sludge. Energy balances were performed to estimate operating temperatures. A minimum operating temperature of 95°F (35°C) was estimated for the month of January and a temperature of 115°F (47°C) was estimated for the warmest summer month.

Full-scale operating data indicate operating temperatures in excess of 110°F (43°C) during winter operation with over 42% volatile solids destruction.

Document Type: Research Article


Publication date: 2000-01-01

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