The given diagram depicts the process by which organic wastes are recycled to make garden fertilizer (compost). Overall, it is evident from the information supplied that there are three main phases involved: preparing, processing, and creating.
Prior to the actual processing of organic waste, it is necessary that recyclers should prepare a plastic container which is 2m3 in volume to store wastes. Particularly, on its walls are three tiers of vents which allow air to come in and go out.
The second stage, meanwhile, entails putting waste food, grass, and newspapers into the container. More specifically, waste food is placed at the bottom of the container, with 15 cm in thickness, followed by the grass layer with the same thickness. Newspapers which were torn into small pieces were laid on top. Subsequently, nitrogen is added into the container and water is poured into only when it comes to hot weather. Afterwards, the cover is finally closed, making it beneficial for waste to decompose under the impact of heat and vapour, eventually releasing biogas.
In the third and final phase, After six months, when opening the container’s cover, the mixture of waste food, grass, and newspaper finally turns to fertilizer, ready to be used for garden work.