When one side of the heap is full, start using the other side. The compost will break down quicker if you turn it from time to time. When it has made a rich crumbly soil, spread the soil in the garden. Groundsmen will often resist the idea of a compost heap. Insist it really does work and can reduce the amount of garbage your school produces.
Some schools ban certain types of containers from their premises.
These containers are simply not sold on the school grounds. Students may bring these containers to school, but they must take them home with them. Good candidates for banning are juice boxes and styrofoam. Start by teaching the students about the various containers. Have them do research to find out how paper, plastic, glass, juice boxes and styrofoam are made, what raw materials are used, and how long the finished container takes to break down after it is thrown away.