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These videos show how you can build a functioning biodigester using paint buckets. These digesters produce only about 3 minutes of gas per day under optimum conditions, but this is enough for demonstration and the slurry is useful for fertilizing houseplants. They take a cup or two of food wastes per day.
Research
Our research group in Makati Science High School would love to know the materials for setting up your version of the mini-biodigester. We assure you that solar cities will be cited in our paper when we make one for our research.