What Types of Waste cannot be Incinerated? 

An Incinerator is a furnace used to combust waste materials. Incineration is a popular waste management method where materials are burnt at high temperatures to convert them into ash, gas, and heat. There are many items that can be incinerated. However, not all materials are suitable for disposal by incineration as some have properties that make them incombustible or resistant to burning. Below is a list of the main materials that cannot be incinerated.

  • Glass:
    • Glass is a non-crystalline solid material that is primarily composed of silica, soda, and lime. It is used in various applications such as windows, bottles, and lenses. Glass cannot be burnt because it is an amorphous solid that does not have a definite melting point. Instead, it softens and deforms under heat. 
  • Metal:
    • Metals are solid materials that are known for their strength and durability. They are used in various applications such as construction, transportation, and manufacturing. Metals cannot be burnt because they consist of non-combustible compounds. Metals, if raised to a high enough temperature will melt and form a pool of liquid, which will then re-harden when the temperature is decreased.
  • Sand:
    • Sand is a granular material that is primarily composed of silica. It is commonly used in construction, manufacturing, and as a filter medium. Sand cannot be burnt because it is an inorganic material that does not have any combustible components. If sand is heated to a high enough temperature, it will liquify and create a pool of glass.
  • Stones:
    • Stones, like sand, are naturally occurring solid materials that are used in construction, landscaping, and decoration. They cannot be burnt because they consist of non-combustible materials. When exposed to extremely high temperatures, stones will decompose into a non-combustible liquid.
  • Concrete and Bricks:
    • Concrete and bricks are commonly used in construction and have high melting points. Concrete is made from inorganic materials such as cement, water, and aggregates, while bricks are made from clay that has been fired at high temperatures. These substances are mostly comprised of non-combustible materials such as silica, alumina, or magnesia.

In conclusion, while incineration is a common method of waste management, certain materials cannot be safely burnt due to their properties. It is important to consider alternative methods of waste management, such as recycling and specialized disposal, to ensure these materials are handled and disposed of safely. By adopting responsible waste management practices, we can protect our health and the environment. 

Author: Devon Shepherd
Mechanical Engineer @ Macrotec