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.

Tilley%20et%20al%202014%20Schematic%20of%20the%20Activated%20Sludge_medium.png

Schematic of the aeration tank and secondary settling tank of an Activated Sludge System.
Source: http://www.sswm.info/category/implementation-tools/wastewater-treatment/hardware/semi-centralised-wastewater-treatments-3