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[[Image:sludge1.jpg|thumb|right|200px|[http://sanitationupdates.wordpress.com/2013/05/13/sri-lanka-new-partnership-tackles-fecal-sludge-management/ Sri Lanka: new partnership tackles fecal sludge management]. Photo: USAID]]
[[Image:sludge system.png|thumb|right|200px|BioTopp small-scale sewage plant with sludge settling system. (© Ökoservice), [http://www.bio-pro.de/standort/unternehmen_bw/index.html?lang=en&artikelid=/artikelde/02768/index.html Bio-pro.de]]]
Sewer and/or latrine construction is not enough to control the public health and environmental hazards of excreta. Latrine and septic/interceptor tank contents are collectively referred to as '''fecal sludge''' and require attention before their emptying and release to the environment. In addition to the “usual” sewage sludge from municipal wastewater treatment plants, the collection treatment and disposal of sludge from on-site sanitation systems must also be considered.
