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Earth auger toilet: Innovation in waterless sanitation

2011 - 2015 • Fundación In Terris

Purpose

To develop several prototypes of a mechanised, pedal-operated, low-cost, easy-to-use, odourless urine-diverting dry toilet (UDDT).

Activities

Development of prototypes:
Several prototypes of “El Taladro de la Tierra“ (The Earth Auger) were designed based on earlier work Dr. Henry had done at the University of Washington. These are decentralized pedal-operated urine-diverting dry toilets (UDDT) where diverted urine is infiltrated into the ground and faeces are being composted. The main innovations with the prototypes were the mechanised, foot-pedal-actuated dry-flush system and sawdust delivery systems. When the pedal is operated the faeces, cleansing paper and automatically added sawdust are mechanically processed through a pipe with an auger inside, which mixes, aerates and moves them through a composting chamber to storage (e.g., buckets). In storage it is detained for an additional 1-5 months (depending upon number of users) for compost stability and pathogen kill prior to being used as a soil amendment. Direct handling of excreta by the user is thus not required as the whole process is pedal-operated until harvest. The urine is harvested separately in hose-connected containers, or mixed with wash water and used in a grey water system. The toilets differ in price and number of accessories: in mass production the different units are expected to cost between US$150 and US$ 300.

Countries of activity

Location of main activity

Objectives

The goal of this project was to develop several prototypes of a mechanised, pedal-operated, low-cost, easy-to-use, odourless urine-diverting dry toilet (UDDT).

Further information

This was an RTTC grant and also falls into the BDS (Building Demand for Sanitation) category.

Filter tags

Bill & Melinda Gates Foundation Composting, vermicomposting (solid waste), composting toilets Faeces or faecal sludge Fertiliser Latin America & Caribbean Local NGO North America Peri-urban Practitioners Product design and engineering Resource recovery Specific to one or several countries Toilets or urinals (user interface) Treatment of wastewater or greywater Urine diversion dehydration toilets (UDDTs)

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Uploaded by:
Trevor Surridge (tmsinnovation)

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