Les toilettes EcoSan - une alternative à l'assainissement classique dans les zones vulnérables
WaterAid India a expérimenté des technologies qui répondent aux besoins spécifiques des communautés dans une région donnée. Avec l'aide de nos partenaires, un tel effort est en cours dans le district de Korba, dans l'État du Chhattisgarh, où certaines régions ont une nappe phréatique élevée. Cette caractéristique géologique implique un risque élevé de défaillance des toilettes à fosse à infiltration en raison de la contamination de l'eau, ce qui a incité nos partenaires à explorer la possibilité d'introduire des toilettes EcoSan dans les zones concernées. L'intervention initiale s'est faite auprès d'une poignée de familles dans un village, et a été étendue par la suite.
The EcoSan system
The EcoSan toilet is a closed system that does not need water, so is an alternative to leach pit toilets in places where water is scarce or where the water table is high and the risk of groundwater contamination is increased. The toilet is based on the principle of recovery and recycling of nutrients from excreta to create a valuable resource for agriculture.
When the pit of an EcoSan toilet fills up it is closed and sealed. After about eight to nine months, the faeces are completely composted to organic manure and can be used on farms. When the first pit is closed, users can switch to using the second pit.
After a successful demonstration in one village, acceptance of the technology has increased and communities have asked for EcoSan toilets to be built in five other panchayats of Korba. The fact that people in these communities have contributed up to 40% of the cost is further proof of the acceptance the technology enjoyed.
We initially used poly-fibre squatting pans for the EcoSan toilets, but because these were not available in Chhattisgarh and had to be purchased from another state the cost per toilet increased to around 16,000 rupees. This cost was not viable, because it made it difficult to get support from the Government's Nirmal Bharat Abhiyan programme (formerly the Total Sanitation Campaign), which can provide up to 10,000 rupees for the construction of household toilets.
To ensure the sustainability of these toilets it was therefore important to reduce the unit cost. Thus, instead of procuring the traditional poly-fibre pans, masons were trained to construct the floor of the toilets as EcoSan pans. This in-situ construction reduced costs substantially to just 12,000 rupees per unit, which could be further decreased by reducing the size of the pit, building the super-structure from locally available material such as bamboo, or making super-structure walls thinner. Together, these changes brought the cost within the range required by the Nirmal Bharat Abhiyan programme.
The processes used to encourage families to first accept the concept and thereafter get them to use a different model of toilet have provided us with some definitive learning points:
- The leach pit toilet, which is seen as a sustainable option for rural areas in general, is useless in this type of context.
- Because construction and use of EcoSan toilets are very different from conventional toilets, intensive training must be given to the mason, users and supervisory staff for a successful outcome.
- Post-construction monitoring is crucial for at least one year so the family can learn processes such as when to close the first chamber and start using the second one and when to remove the compost. If there is a mistake in any one of the three steps, the system will not work.
- Sustained information, education and communication work is necessary to remove social prejudices. Live examples are best and can instill confidence. After the failure of leach pit toilets in the village, the community was uncertain when the option of EcoSan toilets was put before them, but, when one was built and used and they saw the impact, they were gradually convinced.