Which of the following is not a type of hazardous waste incinerator?

The correct choice indicates that fuel blending is not categorized as a type of hazardous waste incinerator. This is because fuel blending refers to the process of mixing hazardous waste with combustible materials, such as coal or oil, to create a fuel that can be burned in industrial processes. It is not a method of incineration itself but rather a preparatory process aimed at recovering energy from hazardous waste.

In contrast, the other options represent established types of incinerators used specifically for the destruction of hazardous waste. The rotary kiln is designed to heat waste at high temperatures and facilitate complete combustion. The fixed hearth burner operates on a stationary platform where waste is burned in a controlled manner. Fluidized bed combustion involves suspending solid waste in a stream of hot air, allowing it to burn more evenly. These methods directly involve incineration, which is the process of burning hazardous waste, to reduce its volume and toxicity.