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3.  FERTILIZER
Concentrated sludge collected from settling tanks is baked at 95°F (30°C) for three weeks in mammoth digester tanks, some as high as 60 feet (18 meters). Bacteria at work during this phase turns the sludge into a biodegradable, nearly inert goo. Most of the sludge dries into pellets and is sold as organic fertilizer.

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