Activated sludge

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1. A granular, porous, organic fertilizer material derived from sewerage. Aeration, digestion, and drying processes kill all bacteria and weed seeds. Nitrogen is the most valuable component of this product.

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Schematic of Activated Sludge Process Facility Before and After
Source: http://www.chiyoda-corp.com/biz/e/environ/biofiner-n/index.shtml

Retrieved from "http://www3.hcs.ohio-state.edu/wiki/index.php/Activated_sludge"
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