Question

Which option gives the best control strategies for Dioxins and Furans in the flue gas emitted from waste incineration facilities?

• A. Avoid burning polystyrene (PS) and polyethylene (PE); ensure the furnace temperature above 1000 °C; and use a bag filter for cleaning the flue gas.
• B. Avoid burning polyvinyl chloride (PVC); quickly cool down the flue gas through the temperature range 400 - 250 °C; and use an activated carbon treatment for the flue gas.
• C. Avoid burning food wastes; ensure the furnace temperature above 900 ± 50 °C; and use an electrostatic precipitator (ESP) for cleaning the flue gas.
• D. Avoid burning metal bearing waste; ensure the flue gas temperature above 1000 °C; and use a venturi scrubber for cleaning the flue gas.

Hint:

- Dioxins/furans form in post-combustion zone.
- Avoiding chlorinated plastics and using proper cooling and adsorptive filters is key.

Answer 1

The Correct Option is B

Step 1: Avoiding precursors of dioxins and furans.
PVC contains chlorine, which can contribute to the formation of dioxins and furans. Avoiding PVC combustion reduces the formation of these compounds.

Step 2: Controlling temperature.
Dioxins and furans tend to form in the temperature range of 250–400 °C. Rapid cooling of flue gases through this range minimizes their reformation.

Step 3: Using appropriate treatment.
Activated carbon is effective in adsorbing dioxins and furans from the flue gas.