The diagram illustrates the recycling process of used glass bottles. Overall, there are three main stages, starting with the collection of discarded glass bottles, followed by an actual recycling process, and lastly, preparing the ready product for sale. It is also clear that the process requires both mechanical and manual labor.
Initially, used glass bottles are collected from a collection point and transported to a recycling plant. There, they are washed using high-pressure water in order to remove any dirt and other impurities before being separated into three colors: clear, green, and brown. The sorted bottles are then taken to a glass factory, where they are crushed into small pieces and melted in a furnace at high temperatures ranging from 600 degrees Celsius to 800 degrees Celsius, producing liquid glass.
Next, the molten glass, combined with some new liquid glass, is poured into moulds to form new bottles. Finally, the finished bottles are filled, labelled, and delivered to supermarkets, where they are sold.