Bokashi Explained: How Fermentation Transforms Your Food Waste

What is Bokashi?

Bokashi (pronounced boh-KAH-shee) is a Japanese word meaning "fermented organic matter". The process was developed in the 1980s by Dr Teruo Higa at the University of the Ryukyus, who discovered that certain naturally occurring microorganisms — when combined in the right ratios and applied to organic waste in an anaerobic (oxygen-free) environment — could ferment rather than rot that waste.

The result transformed organic waste management.

How It Works in a Hotel or Restaurant Kitchen

The system is elegantly simple. Kitchen staff scrape food waste — including cooked meals, meat, fish, dairy, bread and citrus — into a sealed Bokashi bucket. Before sealing, they sprinkle a small handful of Bokashi Bran: wheat bran inoculated with the effective microorganism (EM) culture.

Key steps:

1. Collect — food waste into sealed bucket throughout the day

2. Inoculate — sprinkle Bokashi Bran after each addition

3. Drain — a spigot at the bottom releases Bokashi liquid, a powerful natural fertiliser diluted 1:100 for plants

4. Ferment — after 10–14 days the bucket contents are fully fermented

5. Process — fermented material goes to composting, biodigestion or soil burial

The critical difference from conventional composting: nothing is excluded. Cooked food, meat, dairy, bones — all are accepted. Traditional compost systems reject these materials because they attract pests and generate foul odours when decomposed aerobically. The Bokashi process, being anaerobic and acidic (the fermentation produces lactic acid), suppresses pathogens and eliminates odour.

Why It Matters for South African Hospitality

A 200-room hotel in Johannesburg generates an estimated 600–800 kg of food waste per day from its kitchen, buffets, room service and banqueting operations. Under conventional waste contracts, this is collected as general waste at a premium per-lift rate, transported to landfill, and buried.

Under an Isibindi Bokashi programme:

• Food waste volumes drop by 30–50% through bucket compression and drainage
• Collection frequency is reduced (sealed buckets = no smell, no urgency)
• Fermented output is diverted to composting, generating verifiable diversion certificates
• Hotels receive monthly ESG waste data formatted for GRI, CDP and Green Star reporting

The cost savings from reduced lift frequency alone typically offset the cost of the Bokashi programme within the first year.