Top question when someone hears we live in a tiny house? What do you do about the bathroom? Everyone is curious what the is deal with waste disposal. We use a composting system-some folks buy incinerators, others buy fancy compost toilets and then there are those on a budget who use the bucket system. After taking a permaculture course I became fascinated with going a step beyond the composting system. We had a lecture on biogas systems and the biofuels made available by the anaerobic decomposition of waste. Since that day I’ve been researching systems that have been widely used throughout India, Africa, and Latin America. In the US these systems have been used for some time by water treatement plants as an alternative form of energy for generators in the case of emergencies.
Biogas systems take waste and capture the methane from the anaerobic decomposition of the effluent and supplies you with fertilizer and fuel when the cycle is complete. A digester is the apparatus that controls the decomposition and consists of a sealed tank or pit and a means by which to gather and store the methane. I’m so interested in these systems for reasons of sustainability and efficiency. Composting waste is an alternative to the current system of polluting a finite resource but biogas systems take it a step further by gathering fuel that does not require invasive collection from the depths of the earth. It takes toxic waste, keeps it out of the environment and allows it to be used in multiple ways to human benefit.
There are many different shapes and models of biogas plants but by far the most popular and wide spread design is the Indian cylindrical pit design. It has proven to be reliable in many different environs and it’s widespread use dates to the 1970’s. There are two basic parts to the design, a tank that holds the slurry (manure and water) and a gas cap or drum on the tank to capture the gas.
My dreams were dashed for building one of these for our tiny house when I discovered that two people don’t make enough poop to fuel even a small system. You need around 6 people and 6-8 cows for the system to function in a way that meets fuel needs. The first step of building such a system is getting community support and finding other folks who want to use such a system together. In a city this would make a lot sense but in our current situation out in a rural area, just me, Cedric and the pup it’s not a realistic option.
This technology is one that I will keep on the back burner for now but if this article has peaked your interest at all then definitely check out the via link at the bottom of this page. There is a detailed construction manual for the Indian cylindrical pit system that provides advantages, disadvantages, considerations, costs, labor input and more excellent graphics as well as charts on building this biogas system. I hope to be assisting with the construction of such a system in the near future so until then share you interest and experience if you have it with biogas and biofuel systems. I’d love to hear what folks think of the implementation of these systems and how the social perspective on waste treatment can be altered toward regenerative design.
- How do you see alternative systems fitting in to the philosophy and living of the tiny life?