Big Dog Poop Composter (made from salvaged materials)

 by conky
With garbage dumps becoming full it has become very important to find an alternative to simply tossing your pet's waste into the trash. I have always liked the idea of composting my pet's waste, but didn't want to add it to my garden compost. That is why I decided to build a separate composter specifically for doggy doo. I had originally planned to purchase a dog waste composter, but quickly realized that I need a much bigger one than is on the market in order to handle all of the waste from my 70 lb. Labrador Retriever. Big dog, Big poop, Big composter. I decided to create this Instructable to help others deal with their pets waste in an environmentally sound manner.

Tools & Materials: All that you will need to build a waste composter is a shovel, a saw, a drill, 4" pvc pipe, and a vessel of some sort.

First find your vessel. I decided to use a salvaged plastic 55-gallon barrel and give it a third life. A 5-gallon bucket or a trash can would work if you have a small dog. Rather than recycling the barrel I simply reused it. I got it from our local coffee roaster and used it as a leaf composter for a couple years. Be careful that you don't use a barrel that may have had toxic chemicals in it. Mine used to be full of French vanilla flavoring. That stuff is fairly harmless.

I have also entered this Instructable in the Epilog Challenge, so please remember to vote.
 
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Step 1: Preparing the Vessel

Take your vessel and drill holes everywhere except the top and bottom. Any bit size ranging between 1/4-inch and 3/4-inch will suffice. The holes need to be large enough to allow air to reach your composter, but not large enough to allow soil to fall through.

If you are using a barrel you will need to cut the top off. The open end will become the bottom of the compster. This will increase the surface area that is exposed to the soil and allow rain water to drain easily.

Next cut a circular hole into what will be the top of your composter. I cut a 4-inch hole into mine because I decided to use a 4-inch inside diameter (ID) pvc pipe as the access port for my composter. It's good to have a hole large enough to allow the dog waste to fall into the vessel without the need of a push-stick. The 4-inch ID pvc fits perfectly over the 4-inch hole without the danger of falling in. I was able to find a waste cut piece of pipe that was headed for the dumpster.
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rayleb says: May 15, 2012. 10:12 PM
Well I'm about to make a big mistake I guess. I have been composting leaves dog poo and grass for a few years. I just got through tilling into a 15' X 15' area for what was intended for corn. The composted mix is about 1.5 foot deep. Does anyone know is this dangerous for planting food?
st_indigo in reply to raylebNov 30, 2012. 10:17 AM
You should NOT use pet or human poop compost on fruit or vegetable crops, though tree crops are okay.
1983746758937219 says: Nov 27, 2012. 1:19 PM
I have a huge backyard. Should be an interesting project with all the dog poop back there.
ElmoRoyD says: Apr 9, 2012. 11:43 PM
i have to ask again, how is this going?

im about to have my own house with a backyard. Finally.
jennybean42 says: Jul 17, 2009. 6:31 AM
When I went to girl scout camp, the nurse would go around every week and pour a mixture down the latrine to help it decompose faster... I asked her once what was in it... I wish I could remember the recipe, it was brown sugar, yeast, water, all organic things, but I don't remember it's been 10 plus years. If someone could find that recipe, I'm sure something like that added to the system every once in awhile would help with the decomposition. One wouldn't want to use this for "garden compost" but it would be an excellent septic system rather than the "no man's land" we have in the back of our property!
HaShe in reply to jennybean42Jan 21, 2012. 9:48 PM
I live in a developing nation an none of the over the counter products are available. I found this:

http://www.ehow.com/how_5490180_make-own-septic-system-treatment.html
StuNutt says: Apr 11, 2010. 11:41 PM
During my first season at this location, and with 3 cats to cope with, I dumped the cats'-dump on my compost heap.  It didn't seem to decompose very well!

What do you guys do with the products from cats?  I've had to stop them half-burying it where I am trying to grow a lawn (wire mesh), and they don't seem to be very adept at the burying concept anyway - they just seem to dig a hole, dump 3 or 4 inches away, and then dig another hole but miss the first hole  with the diggings!

The UK BaconSalt Man
http://www.crazy4flavour.co.uk
NaturalCrafter in reply to StuNuttApr 18, 2011. 12:36 AM
We used to have two bombay cats. One would go indoors and use the cat box and nowhere else, and the other hated the indoor catbox and only go outside. Even if it meant my flower box in icy winter. She would use the cat box If she had to but preferred fresh dug soil. So when I first started my garden beds I had to put plastic chicken fencing over them. She hated stepping on that or the black fabric mulch both turned her off. I would compromise and scratch up an area where her poop would not hurt next to bushes or back of garage and she was grateful for the dirt to dig in.
HaShe in reply to NaturalCrafterJan 21, 2012. 9:27 PM
Have you tried to make an outdoor litterbox? I found instructions on the web and made a small one. Instead of store bought litter we sprinkled w/ some fine gravel. It is easy to clean. Our neighbors are happy bec. the cats don't go in their yards eithe.
La and Mike says: May 6, 2010. 12:42 PM
Look up 'black soldier fly larvae'.  These guys will eat poop like it's $500 dollar chocolate!  I am convinced these are creatures sent from another universe-they eat all kinds of human-produced garbage, and then turn into a non-biting, non-filth-and-disease-spreading fly that zips off into the sunset.  I had a bunch in my garden at the end of the season last year, and we would dump everything short of beef bones in, and by the next day there was nothing left!  When the birds and lizards discovered them, they kept the population down a bit, but I still ended up with a little extra compost in the garden.  Wonderful critters-I would like to build some type of containment system, so I could harvest the larvae and put them in my outdoor-bird feeders!
dreiseratops in reply to La and MikeOct 3, 2011. 11:27 PM
Another universe hah :)
HaShe says: Jan 28, 2011. 8:12 AM
Have you city dwellers ever thought of just flushing it? It will go to a treatment plant and be processed. This might be better than the landfill.

I'm going to try this with cat poo.
dreiseratops in reply to HaSheOct 3, 2011. 11:24 PM
I did that a few times when I was a kid when it was part of my chores.
After a while my mom saw me do it & totally yelled at me.
I couldnt understand why. :)
Just Bill says: Aug 25, 2011. 7:11 PM
My guess is that nightcrawlers (which travel deep) are going to keep that thing from ever filling up ... the more food you give 'em, the more nightcrawlers you get. No need to do anything special ... natural processes on auto-pilot will handle things just fine.

Beautiful how that works, no?

That's why the world isn't covered 3' deep in dinosaur doo-doo.

May I suggest, though, that In your next iteration of this design, don't bury it so deep ... and make holes in the top few inches to accommodate ordinary earthworms, too.
WANTONSOUPGUY says: Jul 15, 2011. 9:15 PM
My lab recycles her own poop by eating it. By the third time around she leaves it alone....In the winter she has a large selection of frozen doodies to chose from, like picking a choco bar from the freezer. Yum!
NaturalCrafter says: Apr 18, 2011. 12:38 AM
A system like that works pretty well in sandy or silty soil but not in hard soil.
I have a big lab and we bring it inside but our water bill has doubled. He goes too much to try and dispose of it otherwise.
corioreo says: Mar 4, 2011. 1:24 PM
Conky - please take a look at the Park Spark Project - a friend of mine headed it up in Boston, and your Instructable really reminded me of it:
http://parksparkproject.com/home.html
conky (author) in reply to corioreoMar 7, 2011. 10:55 AM
Great idea. There is a good chance that we can do something similar with the sewer gasses too. Green Mountain Power uses cow manure to produce methane to run generators that make power for the grid. One hurtle for doing this on a small scale is the need for a scrubber to remove the acids from the gas. It will breakdown whatever is using the gas otherwise. I have even heard of people capturing the gas from their septic system to use in a natural gas stove.
calikoala says: Jul 23, 2009. 2:19 PM
I am going to guess you have never pulled one of these out of the ground? i can bet you probably don't want to use what comes out of it for any food or garden purposes.. and I'm sure you will be unpleasantly surprised by the smell when you pull it out not to mention a 55 gallon drum half full of poop will be pretty darned heavy. what is the time that these need to remain i the ground to allow the decomposition? If you are adding daily or very frequently, how are you getting the mixture to combined so it breaks down? I would think it will just compact to the bottom of the barrel and end up just being a huge barrel full of pop that needs to be taken to the dump in one large clump?
mz anne thrope in reply to calikoalaMar 4, 2011. 1:14 PM
The barrel would not be heavy because one end in cut out in order for the "stuff" to compost into the earth. Water and grass clippings add to the composting factor.
teslafan100 in reply to calikoalaMar 19, 2010. 7:29 PM
yea how our you gonna get the poo out?

digimancer in reply to calikoalaMar 14, 2010. 7:08 PM
 Sadly I have to agree with [[calikoala]], there are several other above ground instructables on here that make quite a bit more sense. Oh and lol huge barrel of poop! 
plumber4 in reply to calikoalaSep 17, 2009. 3:05 PM
I'm going to guess that you've never read an instructable. If you weren't so busy trying to be look for flaws in other people's instructions, you would have taken the time to read. Nothing will pile up at the bottom of the barrel because there is no bottom. The author never said or implied that you could use this waste for garden fertilizer. Maybe before you try to prove people wrong, you should at least take the time to read.
gemtree says: Dec 5, 2010. 3:18 PM
Seems to me to be an excellent idea for any type of compost.
jondonna says: Nov 29, 2010. 11:23 AM
What about using this for a small flock (3-4) of chickens?
This would work for any animals waste, correct?
Just to scoop out the poo once a day and put it in the composter?
Preston .s says: Oct 6, 2010. 4:26 PM
ygh
cloneboy says: Jul 19, 2010. 10:25 AM
I'm nowhere near an expert, but it seems like you might want to be sure to balance the nitrogen content of the dog manure and grass clippings with lots of carbon. Dead leaves would probably be good, though my readings say sawdust would be best. Shredded newsprint would probably be good, too. Though written for composting human excreta, I highly recommend The Humanure Handbook as a reference.
Smalfrii says: Jun 7, 2010. 4:11 PM
what about the bags? i would think that, unless you are using compostable or no bags at all, the other bags would just sit and slow down the cycle. Also plastic bags take about 500 years to dacompose, so you would just be partially reversing your purpose for the composter
dombeef in reply to SmalfriiJun 25, 2010. 5:58 PM
Did you read the instructable? Is says that she used corn based bags to compost
Smalfrii in reply to dombeefJun 25, 2010. 6:24 PM
oops my bad i guess i accidentally skipped over that. thanks for pointing that out
dombeef in reply to SmalfriiJun 26, 2010. 6:18 AM
Yeah yourwelcome!
patriciasaulnier says: May 14, 2010. 11:03 AM
We have two huge dogs - a pyranees and a shepherd - and I really love this idea.  I would assume, with the bottom cut off, that as the doggy doo decomposed, it would slowly desolve into the ground.  Could you also add some water along with some grass clippings to help the process?
conky (author) says: Apr 7, 2010. 9:05 AM
After a year with this thing in the ground I decided that I had to move it in order to put a shed up.  I dug the soil from the top of the barrel and 1-foot down the sides. With some effort I was able to pull the barrel out of the ground.  After doing so I took a close look at the volume and condition of the contents.  The barrel was about 20% full and did NOT smell badly at all.  The bridgeable bags were not breaking down very quickly, but any un-bagged poop that had turned white and was very crumbly.  I am assuming that this composter would work much better with compostable bags or none at all.  Still, 20% full after 12-months with a 70-pound Lab contributing the poop seems good.  Especially since it froze this winter before decomposition could really take-off.

Please keep in mind that I do not intend to remove the contents and certainly don't plan to put it on a garden. Although there may be nothing wrong with dong so.  If it becomes full I may move it to a new location.
ourmoneypit in reply to conkyApr 12, 2010. 6:03 AM
I have read that dog poop (likely cat poop, too), like human waste, needs a higher temperature for decomposition, and that such a temp. is not generally reached in a household compost pile.  In our municipality, we are encouraged to bring it in and flush it, so it gets treated with the sewage.

You might want to consider setting up something like a compost toilet.  I think Mother Earth News or Cottage magazine had good instructions for building your own, or there might even be some here.  Once composted via this method, the results could then be used in the garden. 
dalaimomma says: Apr 3, 2010. 8:46 PM

Very interesting dialogue and info exchange.  Has anyone tried this method with cat poo?   A litter box by any other name is still a litter box, but it would be great to keep the resulting poo out of the landfills.

coderob says: Feb 15, 2010. 10:45 PM
Great instructable!  We were about to buy one of those expensive systems that does the exact same thing.  Now we can just build one!  Really clear, easy to understand instructions and appropriate, useful even, pictures.  Thank you!
chuckr44 says: Feb 11, 2010. 11:52 AM
Nice, easy idea.

Though I could imagine it would be illegal in some cities, as it would be considered a septic tank. You can't have a septic tank that doesn't meet local specs and hasn't been inspected. Just don't tell anyone about it.

Do you have to water it each week to keep the bacteria alive? The bacteria is what breaks down the doody.

jimdhaem says: Feb 4, 2010. 1:39 PM
You might wish to add some sawdust from time to time, that is what they do to compost  sled dog poo in Alaska, google it
conky (author) in reply to jimdhaemFeb 5, 2010. 9:38 AM
Good idea. We have good luck with mulch hay. I toss a bit in every now and then.
ElmoRoyD says: Jan 6, 2010. 8:57 PM
how is the compost going?im very curios about it.



i wish i could do something like that... but i live in an apartment.
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