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UNEP-IETC: maESTro2 - Database of technologies that are environmentally sound (Online database)
maESTro is a free searchable directory of Environmentally Sound Technologies (EST). It has been developed for decision makers in local and national governments and other organizations. It is a global repository of information on ESTs. The information provided is intended to improve decision-making processes regarding EST selection, transfer, adoption and use.

Access maESTro to search for technologies on water treatment technologies
http://www.unep.or.jp/maestro2/

Sanicon: Wastewater Treatment Technology (Thematic page)
The five main wastewater treatment technologies covered in these Sanitation Connection pages are waste stabilization ponds, wastewater storage and treatment reservoirs, constructed wetlands, chemically enhanced primary treatment, and upflow anaerobic sludge blanket reactors.
http://www.sanicon.net/titles/topicintro.php3?topicId=6