In Yunnan Province, biogas technology has been fostered since the 1970s and has been a focal point of rural energy development since the Ninth Five-Year Plan (1996-2000) – which was an established plan with guidelines for sustainable development, ecological agriculture and renewable energy. Biogas is generally made in a biogas digester – a large tank filled with bacteria that digests organic waste and provides a flammable gas, named biogas. The produced gas may be used for cooking, lighting, and other energy needs. Waste that has been fully digested exits the biogas system in the form of organic fertiliser.
The Shantou Primary School of the Yunnan Province has such an operator of a biogas system and feeds the digester with manure from livestock. The methane gas that is produced is then used for cooking food for the school.
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Students are responsible for growing organic and healthy food in these gardens that belong to their schools.
Human waste is broken down into compost used to fertilise the garden where children plan their vegetables and production of walnuts that are sold to support the school.
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Humanure is not waste at all — it is an organic resource material rich in soil nutrients. Through the thermophilic composting process, humanure can later be used for gardening or agricultural purposes. The Shantou primary School of the Yunnan Province makes use of this recycling method of composting in order to fertilize their walnut trees. The school earns 600 USD a year per a walnut tree.
Walnut Trees Behind School