The Mini Bokashi Project – (Dipping My Toes)

Bokashi! No it’s not a weird Japanese game show, although it was created by Japanese Professor Dr. Teruo Higa. Bokashi is the fermentation composting of kitchen waste in an anaerobic bin. Normally anaerobic breakdown of material involves putrefying which means the horrible rotting stench of decomposition.

I had read about Bokashi composting and liked the idea but was put off by the idea of the expensive little bin (~$130 at the time) and the need to continually buy their special EM (Essential/Effective Microbes) powder. You essentially put kitchen waste in the bin and sprinkle the special EM powder over the waste to inoculate it with the microbes. Then seal the bin shut from air. Each time you add a thick layer of scraps you add the EM powder. It’s so efficient you can even compost meat and fat in there! Pretty much any solid kitchen waste except bones.

The leachate juice is an amazing concentrated fertiliser that you dilute with water and feed to your plants. The juice is also a great drain cleaner as the bacteria will feast on the food goop you’ve let slip down the kitchen sink. Once the bin is full, the fermented waste can be buried in the ground where the bacteria continue their work. They rapidly breaking down the organic matter faster than would normally happen. The bokashi waste can also be fed to worms so can complement vermiposting.

 

In January 2012 I got really lucky and happened to pick up a Bokashi bin on freecycle for the amazing price of zero dollars. The lid needed a little silicone and the tap wasn’t very well built but it was a jump start into a whole new world that I would otherwise have put off doing.
It doesn’t look very pretty but it was free and it’s been sitting outside my kitchen door fermenting for me for two and a half years, with more to go.

With bin in hand and kitchen waste available, all I needed was my EM inoculant. Even making it from EM concentrate would be fairly expensive long term, but persevere in your research and eventually you find the answer. I initially made my home made EM powder using Method 1 here, but over time have developed an infinitely easier way.
This is what the bokashi bin looks like inside with the strainer removed. The low area below the lip is where the excess juice drains to. The white nut holds the tap in place.

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Carazy Composting Method : No Turn, Self Aerated, Quick Hot Composting System – Part 2

For those of you who’ve come late to the party here is part 1

Carazy Composting Method : No Turn, Turbo Charged, Self Aerated Hot Composting System

After building the self aerated composting bin the next stage was to fill it with organic matter.

I chopped up a whole heap of dry sugar cane mulch, leaves, horse manure and began to fill the bin to the top pausing every 15-20cm to give each layer a soaking with the hose.

When placing the material in there do not compact it. You want there to be small passages of air to allow the aerobic process to occur. The wetting process will make the material heavy and compact it to some extent. If you are putting small sticks or woody material, place the layers at various angles to each other to give more opportunities for air pockets to be created.

 

 

 

 

Given my one person household doesn’t turn over much in the way of compostable food waste, I had a chat with the owner of a local cafe and asked if I could get her food scraps and coffee grounds. She was happy to oblige so I bought a brand new black garbage bin and tied a laminated note to it specifying that it was for composting materials only and my contact details. So twice a week I get a phone call saying my compost is ready and I duck down to the cafe and grab my bin. I can’t believe how excited I am to be picking up someone else’s garbage!

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