Affordable dry sanitation

A dry sanitation system that meets the dignity and convenience of a waterborne system, but without the costs and strain on water resources, has been developed by Enviro Options.
The Enviro Loo system provides a hygienic, simple-to-maintain and affordable alternative which has been tried, tested and evaluated in the field since 1993. About 10, {mosimage}A dry sanitation system that meets the dignity and convenience of a waterborne system, but without the costs and strain on water resources, has been developed by Enviro Options.
The Enviro Loo system provides a hygienic, simple-to-maintain and affordable alternative which has been tried, tested and evaluated in the field since 1993. About 10,000 units have been installed in numerous countries in Africa, as well as in countries such as Brazil, Chile, New Mexico, the USA, Australia and Greece.
The Enviro Loo is an environmentally sound system as there is no discharge and no odour, says its developer, Dr Brian La Trobe.
The system is sealed so there is no leakage, nor can storm water penetrate and flood the container. No sewage treatment plants are required nor is any form of power (although the use of power is not precluded in certain applications).
Once waste has entered the system through the ceramic toilet bowl, an agitator pushes it down onto a drying plate where liquid and solid waste is separated. The liquid drains to the bottom of the container, from where it is evaporated by ventilation.
The solid waste falls onto a bed of organic matter on the drying plate. The plate is sloped, ridged and perforated and the waste is continuously ventilated whilst migrating downwards into the collection area.
The extraction ventilation system results in a continuous airflow throughout the unit, resulting in aerobic decomposition and evaporation. It also creates a negative pressure within the container, which prevents odours from escaping through the toilet pan.
The airflow is assisted by a ventilation extraction unit, which is positioned on the top of the outlet vent pipe. Air is drawn into the container via the inlet vent pipes. The black polyethylene manhole cover absorbs sunlight. Heated air below the manhole cover rises by convection and activates the turbine.
Enviro Loo toilets require little maintenance. They need to be inspected on an annual basis and emptied only approximately once every two years when the waste, now reduced to a compost-like matter of about 5% of its original volume, is raked into a plastic bag. The bag is placed below the manhole cover and outlet vent pipe and left to further stabilise for another 12 months. When finally removed, the matter is safe, odourless and simple to dispose of.
The toilets come in three different models, ranging from units for domestic use (8-10 people per day) to high usage like schools, clinics and industry (up to 40 people per day). Designs for both Western and Muslim users are available.
A unit for domestic use costs around $480.
The separate components of the units can be stacked, allowing for compact, economical transport and shipping. A detailed manual supplies information on assembly and information. If required, Enviro Options provides project management and supervision for the installation of the units as well as training for sub-contractors.
ENVIRO OPTIONS: eloo@mweb.co.za Tel +27 11 7082245 Fax +27 11 7082180
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