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Wastewater Treatment - Solids: Thickening and Digestion

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Uploaded by on Jun 26, 2009

The solids extracted in the primary and secondary treatment steps are first thickened, then pumped into large digesters. Here, they're heated to at least 95 degrees Fahrenheit and slowly broken down by anaerobic bacteria for about 15 days. (A clip from SFPUCs The San Francisco Sewer System: Discovering the city under the City)

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