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1 Urine Diversion Dehydrating Toilets (UDDTs) Rahul Ingle and Dr. Elisabeth von Münch GIZ Sustainable sanitation – ecosan

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Presentation on theme: "1 Urine Diversion Dehydrating Toilets (UDDTs) Rahul Ingle and Dr. Elisabeth von Münch GIZ Sustainable sanitation – ecosan"— Presentation transcript:

1 1 Urine Diversion Dehydrating Toilets (UDDTs) Rahul Ingle and Dr. Elisabeth von Münch GIZ Sustainable sanitation – ecosan ( ) 16 July 2011, Bonn

2 2 The main question What should sanitation systems be like? (focus in development cooperation: pro-poor, sustainable) Foto: Florian Erzinger /

3 3 NUTRIENTS WATER NUTRIENTS WATER FOOD Treatment to destroy pathogens (sanitisation) Closing the loop between sanitation and agriculture

4 4 Sanitation should be seen as a system Household toilets Part A Treatment and storage Treatment for faeces, greywater, urine Road-based transport and/or pipes Part B Part C Part D Reuse (e.g. agriculture) Sale of fertiliser, compost, irrigation water Part E Toilets, showers, baths, sinks, washing machines, … Crop grown with sanitation products (fertiliser, water)

5 5 What is the difference between sustainable sanitation and ecosan? The difference is only very small Ecosan is sustainable sanitation with a particular emphasis on reuse of nutrients (and water and possibly biogas)

6 6 Ecological sanitation… … is not a specific technology, but a new philosophy of dealing with what is presently regarded as waste and wastewater for disposal … applies the basic natural principal of closing the loop by using modern and safe sanitation and reuse technologies … employs up a wide range of sanitation options

7 7 Two principles are often applied in ecosan systems 1.flow streams with different characteristics are often collected separately (e.g. toilet wastewater separately from rest of the domestic wastewater (=greywater)) 2.the unnecessary dilution of the flow streams is usually avoided (e.g. by using dry, low flush or vacuum) Example: waterless urinals

8 8 BadenWaschen Greywater Küchen Toilette Faeces Blackwater Urine Yellow water Brown water Sources… Source: Gulyas, TUHH, 2008

9 9 Greywater l/(p*a) Large volume Low hygienic risk Few nutrients Easy to treat Urine ~ 500 l/(p*a) Small volume Low hygienic risk Nearly all nutrients Faeces ~ 50 l/(p*a) Small volume High hygienic risk Carefull treatment required Characteristics… Source: Otterpohl, TUHH

10 10

11 11 Source: Schematic diagram of Urine Diversion Dehydrating Toilet (can be built as single or double chambered toilets)

12 12 Film This film shows the construction, use and functioning of the UDDT.

13 13 Examples of urine diverting toilets Wost-Man, Sweden waterless: Urine-diversion dehydration toilet (UDDT) with area for anal washing Roediger, GermanyDubletten, Sweden Urine-diversion dehydration toilet Urine-diversion flush toilet Urine-diversion flush toilet Shital ceramics, India

14 14 Urine Diversion Dehydrating Toilet in a school in Lima, Peru Photos: Heike Hoffmann (Rotaria), 2008 More Details:

15 15 School UDDT- built under the Ecosan Promotion Project, Kenya (SIDA, EU, GTZ) Fotos: Hagen von Bloh, GTZ, 2008

16 16 Ecosan wants Safe reuse – but how? Some slides were kindly provided by Blanca Jimenez (Treatment and Reuse Group, Institute of Engineering, UNAM-Mexico), 2007

17 17 WHO Guidelines for the safe use of wastewater, excreta and greywater (2006) Volume 1, Policy and regulatory aspects Volume 2, Wastewater use in agriculture Volume 3, Wastewater and excreta use in aquaculture Volume 4, Excreta and greywater use in agriculture

18 18 Any Questions?


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