Editing Sewage sludge (section)

===Micro-pollutants===
Micro-pollutants are compounds which are normally found at concentrations up to microgram per liter and milligram per kilogram in the aquatic and terrestrial environment, respectively, and they are considered to be potential threats to environmental ecosystems. They can become concentrated in sewage sludge.<ref name="EPA822R08014">{{Cite web |date=January 2009 |title=Biosolids: Targeted National Sewage Sludge Survey Report&nbsp;— Overview |url=http://water.epa.gov/scitech/wastetech/biosolids/tnsss-overview.cfm |archive-url=https://web.archive.org/web/20150216032645/http://water.epa.gov/scitech/wastetech/biosolids/tnsss-overview.cfm |archive-date=16 February 2015 |access-date=12 January 2015 |website=[[United States Environmental Protection Agency|EPA]] |id=EPA 822-R-08-014}}</ref> Each of these disposal options comes with myriad potential—and in some cases proven—human health and environment impacts.<ref name="HarrisonMcBride2009" />
Several organic micro-pollutants such as endocrine disrupting compounds, pharmaceuticals and per-fluorinated compounds have been detected in sewage sludge samples around the world at concentrations ranging up to some hundreds mg/kg of dried sludge.<ref>Stasinakis et al., 2013. Contribution of primary and secondary treatment on the removal of benzothiazoles, benzotriazoles, endocrine disruptors, pharmaceuticals and perfluorinated compounds in a sewage treatment plant. Sci. Total Environ. vol.463-464, October 2013, p. 1067-1075. [https://www.sciencedirect.com/science/article/pii/S0048969713007390 Stasinakis et al., 2013]</ref><ref>Arvaniti and Stasinakis, 2015. Review on the occurrence, fate and removal of perfluorinated compounds during wastewater treatment. Sci. Total Environ. vol. 524-525, August 2015, p. 81-92. [https://www.sciencedirect.com/science/article/pii/S0048969715004593 Arvaniti and Stasinakis, 2015]</ref> 
[[Sterol]]s and other [[hormone]]s have also been detected.<ref name="TNSSS-SAR" />