After my disappointing experience
with a commercial plastic compost bin, I was tempted to give up on closed
composters. The plastic bin didn’t produce any usable compost, and it attracted
an unknown animal that easily chewed its way through the side.
Searching
for advice on line, I learned that plastic bins sitting on the ground were well
known to attract animals. I looked into more expensive bins, some standing on
legs that kept them off the ground and enabled spinning them to turn the
compost. I didn’t feel like spending a lot on another possibly ineffective
commercial product.
I
remembered that I did have two aluminum garbage cans full of bird seed standing
a few feet from the plastic compost bin, their lids secured with bricks. In
five years no animal had managed to penetrate those. And they were round. Maybe
metal barrels could be modified to serve my composting purpose, and maybe I
could even turn the compost by rolling them.
In
April 2013, I started my experiment with garbage can composting. I bought a
small barrel with a tight-fitting lid for about $25 at the local hardware store.
An obliging staff member punched half-inch holes in the bottom and sides for
ventilation.
Through that summer I dumped in kitchen scraps, adding some soil and finished compost that
I hoped would inoculate the waste with hungry microbes.
This
weekend, two and a half years later, I harvested some recognizable compost from
my first two trash-can batches. In both barrels, the materials I’d added had
shrunk from filling the barrel to the top to occupying about a quarter of its
volume.
This is what the finished compost looked like. Newspaper I used to line the kitchen bucket didn't decompose but was easily extracted. |
The finished product was black and seemed fulling decomposed, with no
recognizable food bits. I dumped one barrel’s contents in the vegetable bed and
another in a perennial border.
Why
did my garbage can composters work better than the plastic one? They kept
animals out, of course. I also think adding soil and compost helped them along.
I’d learned my lesson and left out paper shreds, torn-up cardboard from
take-out food containers, and fall leaves, all of which had proven to be too
slow to decompose in a closed bin, although they worked fine when incorporated
into open compost piles. I gave the barrels’ contents one to two years to
decompose after adding the last deposit of food scraps, much longer than the
sixty to ninety days predicted by the manufacturers of commercial bins.
I
also think rolling the cans occasionally probably aided the decomposition process.
I had tried to mix the contents of the plastic bin but found the mechanics
completely wrong—because of its diameter and height, about 2.5 by 3 feet, I
couldn’t dig inside the bin with a small spade, and the material was too heavy
and solid to stir with a stout stick.
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