How to compost toilet

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A presentation explaining how compost toilets work, a series of photos of making a low (no) budget loo and a series of photos showing wonderful, awful and sometimes bizarre compost loos I have seen or …

A presentation explaining how compost toilets work, a series of photos of making a low (no) budget loo and a series of photos showing wonderful, awful and sometimes bizarre compost loos I have seen or used

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Transcript

  • 1. COMPOST TOILETS
  • 2. Why do it?
    • Water input
    • Sewage output
    • Compost
    • F i nancial cost
    • Closing the nutrients loop
  • 3. Water
    • Less than 1% of earths water is potable
    • Gallon jug - tablespoon.
    • 2/3s domestic water use is in the bathroom.
    • Flushing = 5 – 15L water.
    • “ The practice of injecting ‘waste' products and toxic materials into the arterial waterways of Earth is comparable to the idea of using our own bloodstream as a disposal site for hazardous compounds."
    • Keith Helmuth
  • 4. Do they smell?
    • If it smells something is wrong….
    • Anaerobic = Smelly
    • Aerobic = Not smelly
  • 5. Is it disgusting?
    • You never have to touch raw shit
    • Nothing should crawl out or fly around
    • Handled properly it should never be offensive
  • 6. What can go in?
    • Can have wet or dry loos
    • Beware of antibiotics, hormones & tummy bugs
    • N o t tampons
  • 7. Is it safe?
    • Take responsibility for yourselves
    • Recommended to mulch trees
    • Pathogens are eaten and attacked by other compost organisms, cooked to death, and then finally starved of food for a year. They do not survive.
  • 8. How Does it all Work?
    • Microhusbandry and the 4 Stages of Thermophilic Composting
  • 9. 1: Macroorganisms
    • Worms and insects munch away on material, breaking it down.
    • They migrate through the compost heap, moving to cooler areas where they can thrive.
    • Some eat human parasites and their eggs
    COOL Temperature:
  • 10. 2: Mesophillic Phase
    • Bacteria, fungi and other microorganisms that like a moderate temperature range, up to that of the human body, start to feed, multiply and raise the temperature of the pile.
    • They eat and attack human pathogens and compete with them for food.
    MEDIUM Temperature:
  • 11. 3: Thermophillic Phase
    • Once the mesophiles raise the temperature enough, thermophillic bacteria and fungi, which are always present in small amounts, take over and flourish, raising the temperature past 60  C, sometimes up to 80  C. A few hours is enough to kill all pathogens, but activity typically lasts for weeks, especially over the summer.
    • You can monitor the heat of the pile with a spike thermometer (brewers thermometer) or simply leave a metal rod in the pile, which you then take out and feel (put hand near, don’t touch).
    FAST and HOT
  • 12. 4: Curing
    • Macroorganisms and fungi migrate back in and finish off the leftovers, breaking down the harder remaining carbon dense material.
    • Long process of decomposition and humification.
    • Time provides an added safety-net for human pathogens, which cannot survive without food or a host, and at low temperatures for more than a few weeks.
    LONG and COOL
  • 13. What comes out?
    • Black liquid – dilute, tree feed
    • Lovely compost
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  • 42. Entire Humanure Handbook available online for free download at www.jenkinspublishing.com/humanure.html
  • 43. With thanks to…
    • Hannah Thorogood, Aranya, Rainbow Valley Farm, NZ, Ourganics, UK, Tatnam Organic Patch, UK, Permaculture Austria, Andy & Ella Portman, UK, www.permaculture.org.uk