A Composting AND Urine Diverting Dry Toilet (UDDT)
At Critical Practices, our goal is to keep sanitation solutions as inexpensive as possible, and we have achieved that goal!
Traditional collection and treatment is expensive and even has higher costs for large sewage systems followed by a wastewater treatment plant.
Traditional wastewater treatment also presents technical obstacles. Since a mechanized treatment plant is designed to run within a narrow tuning of parameters, failure in a developing country is often just a broken part, power outage, or funding shortfall away!
But - The EarthAuger is a urine diverting dry toilet (UDDT) - a composting toilet.
- It operates by accepting solid material down the vertical tube, adding a small amount of a cover material, then ‘flushing’ by a foot pedal.
- Each flush moves refuse along a Horizonatal chamber - eventually resulting in compost that is partially stabilized.
A composting toilet makes use of naturally occurring bacteria that use the solids as an energy source – as food – and in the process, convert the solids to a more stable form.
Composting happens faster and with greatly reduced odors if done aerobically (with oxygen); a UDDT helps with this in that the urine (and any other water) is separated from the solids by the way that the toilet seat/vertical chamber is made.
The odors from poop dissipate relatively quickly, whereas as urine sits around, it really stinks over time. If both urine and poop sit together – that’s the worst conditions for odors, as the mess becomes anaerobic (without oxygen), causing ideal conditions for odor generation.
There are other ways that the EA-X enhances composting, drying and odor reduction:
- First, a cover material is added (like sawdust, coffee grounds, rice hulls, ash, etc.). These materials absorb odors as well as absorb moisture. Ideal composting happens between 40 and 60% moisture, so it’s best to reduce the moisture in poop as soon as possible in the system.
- Secondly, each ‘flush’ turns an auger that mixes the poop with the cover material. This action makes the composting happen faster by maintaining aerobic conditions, breaking up chunks of materials and continually moving the materials.
- Eventually, composting slows because the bacteria have used the solids that are easily broken-down. It's easy to tell the solids have changed form, as the material that comes out the end has a typical musty odor of rich earth rather than a fecal smell.
- Finally, the black vent tube outside the toilet building also helps drying. As the sun hits this black tube, the air inside heats up, rises and pulls air down through the toilet seat and through the horizontal chamber. Any odors that are produced are carried away.
Learn more about the EA-X
by solving a problem
The EarthAuger is a urine diverting dry toilet (UDDT) - a composting toilet.
It operates by accepting solid material down the vertical tube, adding a small amount of a cover material, then ‘flushing’ by a foot pedal.
Each flush moves refuse along a Horizonatal chamber - eventually resulting in compost that is partially stabilized.