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

Fuel blending is not classified as a type of hazardous waste incinerator because it refers to the process of mixing different fuels to create a combustible material suitable for energy recovery, rather than a method for combusting hazardous waste itself. Incinerators, on the other hand, are specific types of thermal treatment units designed to burn hazardous waste to reduce its mass and volume and to destroy harmful components.

Rotary kilns, fixed hearths, and fluidized beds are all types of incinerators that utilize varying mechanisms to facilitate the combustion of waste. Rotary kilns operate by rotating the waste in a cylindrical chamber to ensure even heating, while fixed hearth incinerators have a stationary platform where waste is burned. Fluidized bed incinerators utilize a mixture of solid particles and air to create a "fluid" state, enhancing combustion efficiency. Hence, these three options illustrate different methods of incineration specific to hazardous waste, distinguishing them from fuel blending, which serves a different purpose in waste management.