Dry toilet systems
Eco Solution cc in Otjiwarongo/Namibia offers different advanced Dry Toilet Systems
Saving Water with the Otji-Toilet
In Namibia water is a scarce resource, and local sources can't meet the growing demand. The Dry Toilet Solutions offer an ecological and economical alternative - different innovative systems are helping to save water and money.
How the Dry Toilet System works
A perforated container under the toilet pot separates solid from liquid. The solid stays in the perforated container, while the liquid runs through a perforated concrete panel into a second chamber. From there, the liquid filtrates into the ground.
After more or less six months the container is filled with solid. With a long steel hook it can easily be moved to the drying area of the tank. There it will dry out and reduce weight as well as volumen. Meanwhile a second container is collecting the droppings under the toilet pot. After another six months, when the second container is full, the dry solid will be removed from the first container, which can then be used for the next turn. So maintenance is only needed twice a year.
Due the perforated concret panel, the tank stays clean and hygienic all the time. A sun based ventilation system at the back of the toilet, always facing to the north, provides fresh air, which keeps it dry and ensures an odourless use. For inside toilets we add an electrical Volt fan, solar based or grid, for night ventilation.
Visitors are invited to get more information about this technology at the Eco Solution compound in Otjiwarongo.
Frequently Asked Questions
Will the Otji-Toilet get full?
Incorrect application and a lack of maintenance are typical problems of technical installations in rural areas. Taking into account this experience, the Otji-Toilet has been developed to be simple and resistant against improper use. As it is open to the soil below, even a lot of liquid would rather seep into the ground than soak the solid. Moreover, poor maintenance does not lead to the collapse of the whole system. If the toilet is falsely used while the perforated container is already full, the solid builds up a blocking of the toilet pot and closes the Otji-Toilet automaticly until maintenance is done.
Do I still need to be connected to a sewage system if I have the Otji-Toilet installed?
In cities like Otjiwarongo municipalities cannot meet the immense demand for new erven (plots of land). Although there is enough land that could be built on, developing this land and especially connecting it to the local sewage system is extremely expensive. With the employment of the CHP's dry toilet a sewage system for low cost housing becomes dispensable. Local authorities can develop new erven at a very low cost.
Will a dry toilet contaminate the ground water of my region?
Environmental researchers agree that the mixing of solid and liquid droppings is to be regarded as the main problem of dry toilets which don't use a sealed tank. The Otji-Toilet, however, separates solid from liquid by collecting the solid in the container. Therefore, it does not fit into the category of traditional latrines and effectively prevents contamination. Nonetheless, the system has been developed for regions which don't serve as freshwater resource areas and it should only be installed after having received official permission to do so.
Can the content of the droppings in the container be used as a fertilizer?
Yes, the droppings collected can be used as a high-quality fertilizer. However, experience has shown that many people do not only use the toilet as a sanitary facility but as a general dumping place. After the composting period the fertilizer should be separated from plastic and other undesirable components.
How much does the dry toilet system cost?
The Otji-Toilet has been optimized to be affordable for low cost housing. It is made out of common building materials and a skilled mason can build up the installation without further assistance. Moreover, the system is designed to minimize running and maintenance costs leading to a win-win situation for individual water-bill payers, municipalities and private water supply companies that often struggle trying to gain acceptance for their cost-recovery strategy.
If you are interested in receiving an up-to-date pricelist of the required building materials or if you have more questions, please don’t hesitate to contact us.