Which statement best describes the incineration process in a waste-to-energy plant?

Which statement best describes the incineration process in a waste-to-energy plant?

• A. Waste is burned in a furnace to produce heat, which generates steam to spin a turbine.
• B. Waste is compacted and used as fuel in cement kilns without combustion.
• C. Waste is processed biologically to produce methane for heating.
• D. Waste is disposed of without energy recovery.

Answer: (A)

The process being described is energy recovery from burning waste. In a waste-to-energy plant, waste is combusted in a furnace to release heat. That heat is captured in a boiler to produce steam, and the steam drives a turbine connected to a generator to produce electricity. This chain—combustion heat, steam generation, turbine rotation, electricity generation—is what makes incineration an energy-recovery method rather than just waste disposal. Some plants also use the steam or hot water for district heating, but the key idea is converting the chemical energy of the waste into usable energy. The other descriptions don’t fit this process. Using waste as fuel in cement kilns implies combustion but not the typical incineration-and-steam-turbine sequence. Biological processing to produce methane describes anaerobic digestion, not incineration. Disposing of waste without energy recovery is simply disposal, not energy recovery.

The process being described is energy recovery from burning waste. In a waste-to-energy plant, waste is combusted in a furnace to release heat. That heat is captured in a boiler to produce steam, and the steam drives a turbine connected to a generator to produce electricity. This chain—combustion heat, steam generation, turbine rotation, electricity generation—is what makes incineration an energy-recovery method rather than just waste disposal. Some plants also use the steam or hot water for district heating, but the key idea is converting the chemical energy of the waste into usable energy.

The other descriptions don’t fit this process. Using waste as fuel in cement kilns implies combustion but not the typical incineration-and-steam-turbine sequence. Biological processing to produce methane describes anaerobic digestion, not incineration. Disposing of waste without energy recovery is simply disposal, not energy recovery.