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Ecological sanitation
Ecological sanitation, commonly abbreviated to ecosan (also spelled eco-san or EcoSan), is an approach which is characterized by a desire to safely "close the loop" (mainly for the nutrients and organic matter) between sanitation and agriculture. Ecosan systems safely recycle excreta resources (plant nutrients and organic matter) to crop production in such a way that the use of non-renewable resources is minimised. When properly designed and operated, ecosan systems can strive to provide a hygienically safe, economical, and closed-loop system to convert human excreta into nutrients to be returned to the soil, and water to be returned to the land.
== Definition ==
The definitions of ecosan have varied in the past. Nowadays, the most widely accepted definition of ecosan, formulated by experts in Sweden, is: "Ecological sanitation systems are systems which allow for the safe recycling of nutrients to crop production in such a way that the use of non-renewable resources is minimized. These systems have a strong potential to be sustainable sanitation systems if technical, institutional, social and economic aspects are managed appropriately."〔Elisabeth Kvarnström, Linus Dagerskog, Anna Norström and Mats Johansson (2012) (Nutrient reuse as a solution multiplier ) (SIANI policy brief 1.1), A policy brief by the SIANI Agriculture-Sanitation Expert Group, Sweden〕
Traditionally, ecosan has often been associated with urine diversion and in particular with urine-diverting dry toilets (UDDTs), a type of dry toilet. For this reason, the term "ecosan toilet" is widely used when people mean a UDDT.〔Rieck, C., von Münch, E., Hoffmann, H. (2012). (Technology review of urine-diverting dry toilets (UDDTs) - Overview on design, management, maintenance and costs ). Deutsche Gesellschaft fuer Internationale Zusammenarbeit (GIZ) GmbH, Eschborn, Germany〕 However, the ecosan concept should not be limited to one particular type of toilet. Also, UDDTs can be used without having any reuse activities in which case they are not in line with the ecosan concept (an example being the 80,000 UDDTs implemented by eThekwini Municipality near Durban, South Africa).〔Roma, E., Holzwarth, S., Buckley, C. (2011). (Large-scale peri-urban and rural sanitation with UDDTs, eThekwini Municipality (Durban), South Africa ) - Case study of sustainable sanitation projects. Sustainable Sanitation Alliance (SuSanA)〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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