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Business compost makes energy. The food scraps collected at Portland businesses (restaurants, offices and more) go to a facility that turns them into energy.
Food waste is blended into a liquid and is broken down by bacteria. The bacteria create methane, which is captured and burned to make electricity. The leftover materials are used as fertilizer to enrich soils.
This 1-minute video from across the pond shows how an anaerobic digestion facility turns food waste into energy.
Food is the only thing allowed in business compost, with the exceptions of BPI-certified compostable bags, used paper coffee filters and tea bags. Non-food materials gum up the system and have to be filtered out. See examples of what's allowed and print posters for your workplace.
While the following items are allowed in your green bin at home, they should not go in compost bins at Portland businesses:
Also, to-go containers, cups and utensils are never allowed in compost, at home or at work. This applies to all types of containers, even those labeled "compostable" or "biodegradable." They should always go in the trash.
*Wondering why flowers aren't allowed? The stems are tough and woody, which makes them difficult for the microbes to break down.
Find more detailed information: