The given diagram illustrates the process of recycling organic waste to produce compost, which is later used as a fertilizer for gardening purposes.
Overall, the procedure consists of five main stages, commencing with materials preparation and ending with the use of compost in gardens after a six-month decomposition period .
To begin, a plastic container with a volume of two cubic metres is prepared, with holes made on two opposite sides to allow air ventilation. Afterwards, various types of organic waste are added in a specific order: food at the bottom, followed by grass, and newspaper on top. Each layer should be equally 15 centimetres thick.
The following stage involves the addition of nitrogen and hot water. Subsequently, a chemical reaction occurs, releasing heat, thus the container should be covered with a lid to let the air circulate via the holes. Finally, after six months of storage, the waste is fully transformed into a compound called compost, which can then be used in gardens as a fertilizer.