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April 16, 2012 at 6:57 pm #37067
How can I build a legal off grid composting toilet?
I use a bucket that goes in to a barrel with worms now, works good but not legal. I even put screen over the top to keep out the rats. Lids seem to keep in the methane and the worms want to escape.
So I was thinking about a compost tumbler that I could keep from leaking on to the ground. Insulate it with space age bubble wrap. I would heat it up with enough carbon and nitrogen and added bacteria? But will it work?
But I think I really need to make a leak proof boat style tumbler toilet. They are about $2000 to buy, that’s crazy, considering they are flimsy plastic. And probably not big enough for even one person.
Well what I need in advice on actually heating the contents in cold weather, without flame, or electricity.
I would love to hear from people with experience with tumbling human manure.April 17, 2012 at 6:05 pm #42564
This is what I got, same price (1K), 8 years ago:
Others want $1,500 plus shipping.
It works well in our Earthship.
Some places still allow outhouses, which are cheaper to build, and compost if you just occasionally drop in some compost starter mix or Rid X.April 18, 2012 at 12:23 am #42565
I too am looking for some plans for a legal home built composting toilet. I am thinking of getting an RV toilet for the seat and flusher and putting that on top of an elevated floor. Underneath will be a 50 gallon drum or even 2 drums on their side. I have not thought about any tumbling right now though drum shape might make that easy enough if one put some thought into it. I have thought that the round shape might make it easy to scoop out the compost. Lets say we had 2 drums. Would need a grate to allow liquids to drain into lower part for evaporation I guess. The sides of the drums might be made as hinged doors in the back so that a person could take a shovel and migrate compost from say right to left thereby stirring it. Could also add brown material. And finally remove some of the well composted material on far left. I’ll keep my eyes open for anything I can find on the web and get back on this. Might make another good blog article.April 18, 2012 at 12:45 am #42566April 19, 2012 at 6:03 pm #42568
I think the book above does not work well….As far as using saw dust, it needs a lot of urine or fish emulsion and should be dry when adding it to the tumbler. Peat moss works much better.
A tumbler will aerate the compost there by forcing the bacteria to grow, unlike a barrel that is not turned. It should heat up to 140 degrees or more, maybe impossible in the winter, unless under ground or in a warm room.April 21, 2012 at 7:31 am #42570
My Biolet NE works fine at 70*F (takes 6 weeks to become true compost fertilizer), and I add 1 cup peat and 1 tsp compost activator per “load” and turn twice. Warmer up to around 110*F works fast(but takes too much energy, usually), but 140*F would kill many organisms. The Earthship III book has plans for a solar incinerator toilet (but, then, you don’t get the good fertilizer quantity). There’s nothing better with true recycling than to eat the food grown in the Earthship, use the compost toilet, and later replenish the garden soil.April 22, 2012 at 2:54 pm #42571
A septic tank causes anaerobic digestion where a composting toilet uses air aerobic digestion? Or is composting more or less both? I mean within a pile of dung you would have anaerobic, unless its stirred.April 23, 2012 at 6:43 pm #42574
This is my idea for a composting toilet made from a couple of 50 gallon drums. What do you guys think? Sorry about the crude windows paint sketch. Also I would add solar powered electric heat to the composter barrel. At least during day light it would be heated. And add a battery would mean it could be heated partially at night and on cloudy days.April 23, 2012 at 7:13 pm #42575
Here is a more simple designApril 26, 2012 at 5:56 pm #42578
I thought of a way to speed up the worm berral composting, plant something like potatos or bamboo in the top. Of course this will use up some of the compost. And I do not know how the worms will take to night-shade roots.May 17, 2012 at 8:53 am #42619
I highly recommend http://humanurehandbook.com. There is extensive free info there and on YouTube. Regarding commercial composting toilets, if you want to stay within the law, check if your jurisdiction requires an approved gray water system in conjunction with the composting toilet.
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