Wastewater can come from a variety of sources like homes, businesses, industries, runoff from roads, lawns and fields and is treated by municipal wastewater treatment facilities (Product, cornell). The solid material that remains after the treatment of wastewater is known as sludge (charac, cornell). Sludge can be employed in many different ways, it can be used as a soil additive or growing medium, sent to a composting facility, incinerated or landfilled (Char, cornell).
Biosolids are derived primarily from a combination of primary, secondary, and tertiary sewage sludges. Biosolids do not contain the coarse grit and screenings removed from raw wastewater during preliminary treatment steps or ash generated from incineration of sewage sludge. Another type of biosolids may be derived from domestic septage, the solid or liquid material removed from septic systems, portable toilets, and other systems that receive only domestic sewage. However, since all sludges and biosolids......
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