Like traditional composting methods, composting toilets rely on biological decomposition to convert humanure into a safe and stabilized soil amendment. Unlike a conventional flush toilet, a composting toilet uses no water to evacuate wastes. Material is collected in a composting chamber where it is decomposed into water vapor, carbon dioxide, and a small volume of compost that is rich in nutrients and organic matter.
The Center has a Clivus Multrum composting toilet that has been in operation since 1990. Humanure collects in a composting chamber located in the basement and a small amount of carbon-rich material such as wood shavings or sawdust is added after each use.
The finished compost has a bacterial content, texture, and color similar to that of topsoil and is used to fertilize ornamental plantings, trees, and other non-food related agricultural endeavors. A ventilation fan provides constant aeration of the pile and creates a negative pressure in the bathroom and basement, ensuring any odors are eliminated.