The diagram illustrates how recycling organic waste to produce fertilizer takes place.

The diagram illustrates how recycling organic waste to produce fertilizer takes place. In general, there are two main parts. As we can see, the first three steps are preparatory, among which the second and the third ones are the most complicated. Notwithstanding the main phase, the fourth one occurs naturally without human interference before the result is collected in the final one. As shown in the diagram, in the first phase, a plastic container with 2 cubic metre which has a large number of holes for air circulation is prepared. After that, the waste including food, grass, and news paper is dropped respectively into the bottom of the container. Each of these layers is thick, at about 15 cm. Then water and nitrogen are dropped into this big bottle to be ready for the next phase. In the next phase of the recycling waste, after being sealed by a cover, this container experiences a significant decomposition of organic matter. There is a large amount of carbon dioxide, methane, and heat escaping through the air vents. After half of a year, the compost is collected and the process finishes.