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Bokashi Vermicomposting

Bokashi 'Compost' Added to Worm Bin

As some of you may know, for the last couple months I have been experimenting with another waste management strategy called ‘bokashi’. I’ve been writing about it over on CompostGuy.com (which unfortunately seems to be experiencing some server issues as I write this).

For those of you unfamiliar, bokashi is a very simple way to deal with common household (organic) wastes. All you need is a bucket (although a specialized bokashi bucket works best), some bokashi mix, and some food waste. You then add your scraps to the bucket and sprinkle some bokashi mix at the same time. When the material reaches the top of the bucket you put on the lid (which should always be on when not adding scraps) and let it sit for a few weeks. The final product can then be dug into your garden or added to your compost bins. The bokashi mix itself is wheat bran impregnated with special microorganisms. You can buy this mix or make it yourself, which can actually be a lot of fun.

Unlike vermicomposting and composting, bokashi is an anaerobic process, but interestingly enough it doesn’t smell bad thanks to the bokashi mix microorganisms. Also unlike regular aerobic composting, you don’t actually end up with a stabilized, humus-rich material. The end materials need to undergo further decomposition in order to become an effective plant fertilizer and soil conditioner. Nevertheless, given the simplicity of the process I think it’s a great option for a lot of people – anyone with a garden or compost bins, that is – I wouldn’t recommend this for apartment dwellers, unless they happened to have a big balcony garden and/or some worm bins.

Part of the reason I was attracted to bokashi (aside from being such a composting fanatic) was because I suspected that the end product would make an excellent ‘worm food’. I commonly recommend that people keep their food scraps in a separate container for a little while so as to allow time for microbial colonization. Well this method does just that, and the final product is absolutely loaded with microbes – and once it is exposed to aerobic conditions it likely becomes an even richer microbial playground.

Two of my bokashi buckets have been brewing for a number of weeks now so I decided it was finally time to try feeding some of this stuff to my worms. As you can see above, I put a decent layer of material at the top of my European Nightcrawler bin. I made sure to add some dry bedding first, just to help separate it from the worms a little should they not feel like moving into it right away. I’ve read that worms go crazy for the stuff, so I’ll be interested to see what happens.

I’ll keep you posted!

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Written by Bentley on March 26th, 2008 with 14 comments.
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14 comments

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Get your own gravatar by visiting gravatar.com NewAlchemyGuy
#1. March 26th, 2008, at 6:00 PM.

Thank you for your websites and your posts on bokashi and other composting methods.
I’m very passionate about all this and I’m working to help others better understand the entire process and show that it doesn’t require special, expensive products to compost the bokashi way. It’s all available wild and free.

: )

Get your own gravatar by visiting gravatar.com Bentley
#2. March 27th, 2008, at 6:52 PM.

Hi NewAlchemyGuy! (great name – I get the feeling you and I would be interested in a lot of the same stuff!)

Thanks for the positive comments. I try not to be TOO biased when it comes to any one type of composting (such as vermicomposting, which is my favourite). I feel strongly that there is no ONE solution – most of these strategies work very well together.
8)

Get your own gravatar by visiting gravatar.com Steve
#3. March 28th, 2008, at 11:21 AM.

Bentley,

Whenever I clean my goldfish bowl, I usually throw out the dirty water. But I was wondering if it was safe to use the water in my worm bin. I am extremely concerned with what I am putting in the bin because I want to use the castings on my homegrown fruits and vegetables that I will also be feeding to my children. Is the fish manure safe/beneficial for my worm bin?

Get your own gravatar by visiting gravatar.com Bentley
#4. March 28th, 2008, at 12:18 PM.

Hi Steve,
Great question!
If your worm bin drains well you would probably be ok doing this, but I would definitely do so in small doses and would also test it out in part of the bin first. I’ve read that fish ‘manure’ from aquaculture doesn’t work very well as a worm food (due to the high ammonia levels, I believe), but I bet if you soaked some shredded cardboard in your fish water then feed that to your worms it would work well (again, experiment with it before going gangbusters)

B

Get your own gravatar by visiting gravatar.com Mauricio
#5. April 28th, 2008, at 3:06 AM.

Bentley,
Can Vermi and bokashi transform big amounts?What indoor or outdoor area would you need to compost 10 Tons or 50 Tons of Daily organic, mainly raw vegetable and fruit waste maybe mixed with other chunks of matter?

Get your own gravatar by visiting gravatar.com Bentley
#6. April 28th, 2008, at 3:21 PM.

Hi Mauricio,
While there is technically no limit to the amount of waste these sorts of systems can handle (you simply make larger systems, or many smaller systems), logistically speaking both of these methods can have some limitations. In the case of bokashi, if you make a monstrous system you will end up with a huge amount of fermented waste on your hands – material that will need to be put somewhere to complete the decomposition process. I suppose it could be spread out over fields, but you would like end up creating a pretty foul odour in the area.

Worm composting can definitely be done on a large scale, but the limitation there is the space required to handle lots of wastes. Unlike ‘hot composting’ where you can simply heap huge amounts of material in one (small) area, wastes need to be spread out very thinly in a worm composting system in order to prevent excess heating and other worm hazards (such as release of ammonia gas etc). In all honesty, I don’t know what size of system would be required for 10 or 50 tons of waste, but it would definitely need to be very large. In well-functioning industrial ‘flow-through’ system, material is often laid down in 1 inch (per day) layers – but this will certainly depend on the type of waste being processed. As you can imagine, a LOT of surface area would be required to spread 50 tons of material out in a layer 1 inch thick! But that’s certainly not to say it can’t be done.
Last year I posted a video that showed a large scale vermicomposting system used in Hong Kong. I’m not sure of the exact processing capacity but I’m pretty sure it’s tons per day. Here is the link:
http://www.redwormcomposting.com/large-scale-vermicomposting/large-scale-vermicomposting-in-hong-kong/

Get your own gravatar by visiting gravatar.com Jennifer
#7. September 3rd, 2008, at 11:34 AM.

Hi, I’d like to hear how your Bokashi Vermicomposting experiment went. I’ve been thinking of doing the same thing, but was concerned the fermented food might be too vinegary or acidic. How long was it before your worms were ready to move into it?

Thanks,
Jennifer

Get your own gravatar by visiting gravatar.com Bentley
#8. September 5th, 2008, at 3:40 PM.

Hi Jennifer,
I actually ended up adding to much bokashi waste to one of my bins and it went really sour on me. You definitely need to be careful when adding to small indoor systems.

The bokashi I added to my big outdoor bin on the other hand was consumed quite quickly.

Get your own gravatar by visiting gravatar.com not_tried_it_yet
#9. October 16th, 2008, at 9:03 PM.

One of the vermicomposting forums suggested that garden lime would be a cure for over-acid conditions.

I am thinking that the people that added too much bokashi ended up with too much of an acidic situation, so garden lime added to the mix might help (or ordinary baking powder?).

I am looking to try bokashi / vermiculture and have no experience yet but thought I would mention this.

Get your own gravatar by visiting gravatar.com Bokashiguy
#10. October 17th, 2008, at 2:37 AM.

Just add a little bit of bokashi at a time, the worms thrive on itand you won’t have any problems.
All my bokashi goes to my worm bins.

http://bokashicomposting.com

Get your own gravatar by visiting gravatar.com manoj
#11. October 24th, 2008, at 10:13 AM.

R/sir
pl guide me. is it possible to add the earthworm in the fresh vegetable waste? na dhow much quantity and which one species is good for this waste in india ? and if other species are not degrade why ?
Thanks & regards
manoj

Get your own gravatar by visiting gravatar.com Bentley
#12. October 24th, 2008, at 4:24 PM.

Manoj – it is definitely better to use wastes that are partially decomposed, since there will be a lot more microorganisms for the worms to feed on. It is also a good idea to have some sort of ‘bedding’ material of you are feeding the worms with water-rich veggie/fruit waste. This helps to keep things balanced and protects the worms from fluctuating conditions in the waste materials.
In India, a good choice would probably be either the Blue Worm (Perionyx excavatus) or African Nightcrawler (Eudrilus eugneniae) since the are very well adapted for hot climates, and perform extremely well in these conditions. Red Worms (Eisenia fetida) are also very versatile, and are certainly used widely in India already.
Not sure I understand your last question.

B

Get your own gravatar by visiting gravatar.com andrew price
#13. June 19th, 2009, at 2:29 PM.

Hi Mate

You’re going to have to write a book….excellent stuff
Andrew

Get your own gravatar by visiting gravatar.com Ng
#14. April 29th, 2010, at 10:52 PM.

If you can add the fermented product from the bokashi bin to a wormery, do you still advise against adding meat waste in a bokashi?

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