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Bokashi Bin: What You Need To Know To Make Amazing Compost

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Make amazing compost from all your food scraps and reduce waste with a Bokashi Bin.

Reduce Food waste with a Bokashi Bin
Bokashi Bin. Image by Gary Perkin @ stock.adobe.com

Are you looking for a convenient way to eliminate your food waste?

One solution – even for apartment dwellers – is the Bokashi Bin. This is an indoor, small space system for “composting” food scraps. It will help you to eliminate food waste and reduce the total amount of waste that ends up in landfill. We have invested in a Bokashi Bin and it’s had a huge impact on the amount of waste that goes into our bin!

This article will cover everything you need to know about Bokashi – what it is, what are the many benefits, how to use a Bokashi Bin and how to make the most of your Bokashi waste.

Make amazing compost, full of beneficial microorganisms your plants will love and cut down on waste with a Bokashi Bin.

Here’s how.

What Is A Bokashi Bin?

A Bokashi Bin is an indoor “composting” system. It’s called composting because cuts your food waste, but it doesn’t actually compost your food…it ferments it. Once your food has fermented, it still needs to be further composted.

The Bokashi system uses a select variety of microorganisms to ferment or “pickle” your food scraps. These beneficial microorganisms are lactic acid bacteria, yeasts and photosynthetic bacteria and are known as Effective Microorganisms or EM.1® for short.

This system of fermenting food before composting was invented by Japanese professor of agriculture Dr Teruo Higa in 1982.

In the Bokashi composting system, you add these effective microorganisms to food waste in the form of dry bran, which you sprinkle over your waste to inoculate it. Some systems use a spray instead – it’s up to you which you prefer.

For more information on the history and science, check out this video:

How Does A Bokashi Bin Work?

A Bokashi Bin uses an anaerobic system and friendly bacteria to “pre-digest” food scraps before you dig them directly into your garden, add them to your compost bin or feed them to your worm farm.

The Bokashi Bin system comprises of a bucket with a tight fitting lid to create the essential anaerobic (airless) environment, a grate in the bottom of the bucket to allow the food scraps to drain, and a tap at the bottom to drain off this beneficial Bokashi “juice”.

Once you place your scraps in the bucket at the end of each day, you add a handful of bran or a few sprays of the friendly bacteria, fit the lid on tight and let the micro bugs get to work.

When the bin is full, you can dig it directly into your garden or better still, leave it to ferment for a further two weeks before adding it to your garden.

What Are The Benefits Of Having A Bokashi Bin?

If a Bokashi Bin doesn’t compost your food scraps, what’s the point of having one? Here are the benefits:

  • Bokashi processes ALL your scraps. There are some food scraps you can’t add to a compost heap or feed to your worms or chickens. (That’s if you have them.) You can conveniently feed it all to your Bokashi bacteria.
  • Because it’s an indoor system, you can use a Bokashi bin to process scraps even in an apartment or small space living.
  • If you have a worm farm, you can use a Bokashi bin to pre-process your food scraps before they go to the worms. They are then able to eat food scraps they couldn’t beforehand.
  • Traditional composting can take months. Bokashi waste breaks down quickly once it’s fermented (about 45 days), speeding up the composting process.
  • Using a Bokashi Bin to deal with your food scraps is clean, easy and requires little maintenance.
  • Your food scraps won’t smell bad and won’t attract flies so you can keep your Bokashi Bin inside. We all tend to follow the path of least resistance. The easier you can make composting, the more likely you and your family will do it.
  • Studies have shown that using the microorganisms in the soil reduces soil-borne pathogens and increases the decomposition of organic matter. This makes nutrients available to plants quicker, promoting plant growth. You can get a summary of these studies on the Permaculture News page.
  • This study found an increase in macro and micronutrients in the soil when using microorganisms as opposed to conventional composting. And this study revealed healthier plants, increased yields and a decrease in disease and pests when using compost decomposed with microorganism EM technology. All of this is great news for the home gardener and agriculture in general!

What Can You Put In A Bokashi Bin?

Bokashi can handle a wider range of food scraps than you can put in a regular compost system or worm farm. The scraps you can put in your Bokashi Bin include:

  • All fruit and vegetable scraps (raw and cooked)
  • Seeds and nuts
  • Eggshells (give them a bit of a squash to break them up)
  • Meat and Fish
  • Bread, cakes, crackers etc.
  • Cooked food (rice, pizza crusts etc.)
  • Coffee grounds tea leaves and tea bags
  • Paper products like tissues
  • Dairy (like cheese)
  • Spent flowers
  • Small bits of wood like toothpicks or bamboo skewers

What should you not put in your Bokashi Bin?

  • Food that is already rotten or mouldy. You want your scraps to ferment, not rot in your bin.
  • Large bones
  • Shellfish shells like hard crab shells
  • Synthetic tea bags or staples
  • Liquids like milk. You want to avoid getting your Bokashi too wet.
  • If you’re adding cooked food scraps, like the scraps from making your own stock, drain the scraps so they’re not too wet.

How To Use Your Bokashi Bin – Step By Step Instructions

Are you encouraged by the list of Bokashi benefits? Here’s how to use it:

  1. First, install the tap and insert the grate in the bottom of the bin. Make sure the tap is turned off.
  2. Put your kitchen waste into the bucket and press it down to compact. Some brands come with a trowel for this purpose. Or you can use a potato masher or a piece of scrap paper, which you can then leave in the bucket.
  3. Sprinkle a handful of the Bokashi bran over your food scraps. How much? About a tablespoon of bran for every cup of waste. Err on the side of more not less. And if you are adding meat, dairy or other oily or protein-rich foods, add extra bokashi bran as these foods take longer to break down. Or you can spray your food scraps with the Bokashi spray. Use two or three sprays to cover your scraps – more for meats etc.
  4. Cover with the lid and check that it is on tight.
  5. Repeat layering your food scraps with the Bokashi mix.
  6. Regularly tap the juice out to avoid rot – about once or twice a week, more if necessary.
  7. Once your bucket is full, dig the contents into your garden or add them to your compost heap. If you have two buckets, you can leave the contents to ferment for a further two weeks while you’re filling the second bucket.
  8. Rinse your empty bucket out with water (no detergents!) and start again.

The key things to remember when using your Bokashi Bin are: keep it airtight, drain it regularly, squash down your scraps to keep them air-free and use enough Bokashi mixture to ensure your scraps are well inoculated with friendly bacteria.

Does A Bokashi Bin Smell Bad?

If you’re composting inside the house, you don’t want the house full of rotting smells so does the Bokashi Bin smell?

The short answer is yes, BUT…it’s not a rotten food smell, and it only smells when you open the lid.

The smell is a fermenting smell, like vinegar or cider. It’s not a bad smell (unless you hate the smell of fermenting foods). If so, you can keep it outside, in the laundry or otherwise away from where you can smell it. Once you close the lid though, you can’t smell it.

What Can You Do With The Bokashi Juice?

The liquid that drains from your Bokashi bin is a potent elixir of friendly bacteria, enzymes and nutrients from your food scraps.

Undiluted, you can safely pour it down your drains to keep them from getting clogged or smelly and reducing algae buildup.

Diluted, you can use it to feed your houseplants, pot plants or pour it on your garden. To use it as a fertiliser, dilute it to about two teaspoons per one litre of water and pour on the soil around your plants – don’t apply it directly to foliage.

There Is White Mould In My Bokashi Bin, Is That Ok?

It’s common for white mould to grow in the Bokashi Bin – this is normal and ok. It’s a beneficial fungus that helps suppress pathogens. What you need to look out for is black mould. Black mould is not good.

If your Bokashi waste is smelling rotten, this website suggests adding extra Bokashi Bran with some sugar, and that should kick-start the fermentation process again. If there is black mould, they suggest burying the food scraps with extra Bokashi and sugar and leaving it for a few months in the soil to break down completely.

To avoid your Bokashi Bin scraps from rotting, try to put your scraps in the bin every day, rather than letting them sit and start to rot on your bench. And avoid putting rotting food in your Bokashi.

What Do You With The Bokashi Waste After It’s Fermented?

The three main options for disposing of your fermented food scraps so that they can further break down include:

  • Burying the scraps in soil
  • Putting the scraps into your regular compost bin
  • Feeding your scraps to your worm farm.

If you want to bury your scraps, dig a hole about 25cm deep, and add the Bokashi waste and mix in some soil. Cover the waste entirely with soil and then let it break down for a few weeks. You can continue to dig and add more Bokashi to the same hole, or you can dig it into various places in your garden.

You can dig your holes around plants and trees but make sure young roots don’t come in contact with the waste. The waste is acidic for the first couple of weeks before neutralising.

Or you can add your Bokashi waste to a conventional compost bin, covering the scraps with carbon (dry) materials as you would with regular composting.

Finally, because the food has been fermented and pre-digested by bacteria, many foods that were previously inedible for worms can now be fed to them. If you feed you Bokashi waste to your worms, make sure you let it ferment for two whole weeks before you start. Then just give them a little bit to start with so they get used to the new foods. For more information on feeding Bokashi to your worms, check out this site.

I Live In An Apartment, What Do I Do With The Bokashi Waste?

Composting is not always practical for every person. Maybe you live in an apartment with no balcony. Maybe you’re in share accommodation. We can only do what our circumstances allow.

Having said that, if you’re keen to reduce your food waste, but you don’t have a garden or space for a compost bin, there are a few options available:

  • If you live in a block of units, is there somewhere on the property where you can dig in your Bokashi waste?
  • Do you have room for a worm farm on your balcony?
  • Do you have room to make a “soil factory”? A soil factory is a large container filled with soil into which you can empty your Bokashi waste. To make a soil factory pour in 1 part soil, add your Bokashi waste (1 part) and then top with two parts soil. If your Bokashi Bin holds 12 litres of waste, you will need a bucket large enough to hold 48 litres: 12 litres of soil, followed by 12 litres of Bokashi waste and then topped with another 24 litres of soil. Use this healthy soil in to grow food in pots!
  • Do you have family or friends with a garden or compost bin who will benefit from your Bokashi waste?
  • Does your council offer scrap food pick up? Some councils do, and it’s a great waste-reduction service. If your council doesn’t, request that it does!
  • Do you have a community garden close by that you can give it to?
  • Can you join a composting network?

Final Bokashi Bin Tips

Some final tips on using your Bokashi Bin:

  • To clean your bin, you only need to rinse it in water. Pour the dirty water onto your garden! Detergents can stop the friendly bacteria from working well.
  • To make cleaning easier, line the sides of your Bokashi Bin with newspaper. The paper can be composted along with the food scraps.
  • If you have a lot of food scraps, you might consider two bins so that one can ferment while you fill the next.
  • To help the process along, cut up large scraps of food before adding them to your bin. For efficiency, keep all scraps until the end of the day. One trip. One addition of the Bokashi mixture. In hot weather, keep your scraps in the fridge, so they don’t rot.

Where You Can Get a Bokashi Bin

If you’re interested in getting started with Bokashi composting, here’s how. For those who can DIY, here are instructions for making your own Bokashi Bin and your own Bokashi microorganism mix.

If you would prefer to buy the complete Bokashi system,  you can get it online from Biome. (This is an affiliate link, so if you buy from them, I get a small commission at no extra cost to you). They also sell the bran separately.

Or you can pick up a system from your local hardware mega-store.

Finally, a few smart councils are offering rebates for either a Bokashi Bin, Worm Farm or Compost Bin. Check out this website to see if your council offers a rebate.

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5 Comments

  1. Tech issues meant that some of the latest comments got lost in the ether. Here’s a copy of them. Thank you to the commenters! Melissa xx

    “We’ve been using bokashi bins for about 3 years now and I will rave about it to anyone who will listen! We don’t even have a landfill bin in our house so that there isn’t the option to just throw things away mindlessly. I ended up getting two bins so that we could start filling the 2nd and just let the first sit for a while. I posted on a facebook gardening site to find someone interested in have the waste and did the same thing again when we moved to a new city – it definitely wasn’t hard to find eager takers. I would also add that it’s important to regularly drain the tap to avoid smells!”

    “I Bokashi but don’t have a compost, so I got on this website called sharewaste.com and got in touch with a neighbour who composts! I highly recommend it. ❤️”

    And this one was emailed – great idea!:

    ” I use an old blender and water to reduce vegetable/fruit matter, egg shells etc. and pour this liquid directly to flower beds where it does not smell and is quickly assimilated by worms in the garden. Have found this works very well for us. I agree regular composting takes forever and attracts unwanted rodents.”

  2. Hi I have just received my Bokashi bin system, my question is how dies the tap fit into the bottom, does the washer go on the outside or inside if the bin?

  3. Melissa,
    Thanks so much for this informative and practical article! I appreciate your honest and yet constructive advice about food waste recycling with Bokashi.

    I think that there are many factors involved in making behavior changes and your writing definitely supports a step in the right direction, a sustainable direction!
    Thanks!

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