Overview
Coal-fired power plants, cement kilns, steel plants, and waste incinerators can release mercury and dioxins. Powdered activated carbon is injected into the flue gas, where it captures these pollutants before being collected with the plant's dust.
How it works
- Powdered carbon is injected into the flue-gas duct.
- It mixes with the gas and adsorbs mercury and dioxins.
- The loaded carbon is captured by fabric filters or electrostatic precipitators.
- Emissions are monitored to adjust the dosing rate.
Why coconut shell
Coal- and lignite-based powders are also common here; the choice depends on the pollutants, the plant, and cost.
This page describes activated carbon in general. Suitability for a specific use depends on the activated carbon grade and the system it is used in.