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Our Modern Composting OutHouse

 
Posts: 115
Location: Tyler Texas
12
forest garden tiny house solar greening the desert homestead
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We kicked so many ideas around. We tried the humanure bucket for a year and in the end we made a trial out house for our woofer guest. After a year, the last thing I want to do is spend my zone 1 time hauling other people's poop and wife is just NOT going to do it. Which means, if I'm working it does not get done and it does stink in hot Texas summers.

The solution. A flushable composting toilet. We use a water efficient flush toilet and an RV toilet would have used even less water. However, as the concrete slab was already here I could not build the worm compost tank directly under it. We do not feel like we are wasting water at all. We are making soil and excess water, if there ever is any, will just feed a fig and willow tree; a tree bog at the end of the line.



Based on calculations of the original system we designed the system for one person continuous and 2 people intermittently. The tank is a 2.5' cube filled with wood chips, Compost, leaves, and 1 pound each red Compost worms and the big night crawlers. The liquid drains out the bottom into a pipe where it is taken to a 1.5' deep, 1.5' wide, 20' long wood chip bed. It's a tank made from folded 1/4 inch thick HDPE sheet; which is cheap for making tanks and unlike Liners will not get fireant holes in it nor rock damage. It will grow reeds or something in the future. Though, it's designed to be aerobic. From there it goes to a 50' long trench, 1'*1'*50', also filled with wood chips lined with thick old billboard Liners. Everything is on a slight slope. At the end of the line is a Compost/gravel pit with a fig and willow tree. We will pretty it up around the edges, but basically it's raised 3 inches above grade so that rain water does not run into the filter.

The whole thing is based, loosely, on the solviva flush toilet. Claiming a 90% reduction in nitrogen ect. http://www.solviva.com/wastewater_management.htm

The end result will be soil creation and moisture for a productive tree. Closing the farms cycle. I'm planning on a complete write up on my site in the near future. I must say it true that the more poo I put in the less there is in the tank! I'm impressed! The system has no foul odor at all. We will be converting the house soon.

The outhouse is 8'*8' and has a shower with a $20 shower head that heats the water as it's used. We even threw in a twin bed and heat pump mini split system for a guest. All in all, I'm very happy with the outcome and can see my self making a quadruplex of these 8*8 rooms with a central shower toilet facility.

Here are my notes I distilled down for design. Rough notes;

264 gallons of tank for 7 people.
38 gallons per person. 8778 Cubic Inches

Lots of tiger worms & red worms! Each person poops about .66 pounds per day. So perhaps 1# of worms per person?

2/3 full of wood chips & leaves chipped, started with a top layer of Compost.

Double size with separate chambers is best for alternating used side with composting side for clean out.

Equal volume second wood chip planter boxes with plants or trees.

Lab tests showed a 90 percent reduction of the total Kjeldahl nitrogen, from 86 ppm to 8.1 ppm, and a 96 percent reduction of the ammonia-nitrogen, from 77 ppm down to 2.5 ppm ... the flow-through took less than 10 minutes, and the foul odor was totally removed



Notice the tank, though in daily use, is rated G. The worms devour the deposits quickly! For cold climates you line the tank with foam board and the worms will generate enough heat to keep functioning year around.

To make the tank I poured the bottom then formed up with chip board laying in rebar prices as I filled the form. Then, I drilled holes in the pipe at the sloped bottom of the tank. I painted a credit card thick layer if plastic on the bottom and edges to prevent any liquid from getting into the ground.
PANO_20160410_085528.jpg
Inside the outhouse
Inside the outhouse
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Poo filter worm tank
Poo filter worm tank
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Dan alan
Posts: 115
Location: Tyler Texas
12
forest garden tiny house solar greening the desert homestead
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One more photo. I missed the toilet in the first pic. Posting from my phone..

Outside shot. We used recycled tin, sliding glass door doubled up, and made a duck pen on the back side. The pipes sticking out are the shower drain and future hand sink drain. This water will be fed to the near by duck a ponic system for hydroponic recycling.
PANO_20160410_085715.jpg
Inside the 8 x 8 outhouse
Inside the 8 x 8 outhouse
IMG_20160410_090041.jpg
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IMG_20160410_094725.jpg
Outside, duck pen on back
Outside, duck pen on back
 
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Abundance on Dry Land, documentary, streaming
https://permies.com/t/143525/videos/Abundance-Dry-Land-documentary-streaming
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