Updated: July 2002

1. Description of the System

The WKV type Dioxin Elimination System forms a packed bed of granulated activated-carbon, and a temperature of 130ºC to 170ºC in the system efficiently eliminates dioxins by letting exhaust gases effectively interact with the activated carbon.
Ebara's activated carbon absorbers (WKV type) are a well-known, proven technology in Europe, and Ebara produces and sells all parts of the system, from the activated carbon to the system itself.

2. Characteristics

1) Since exhaust gases effectively interact with the activated carbon, more than 99% of the dioxins can be eliminated.
2) Fresh activated carbon dosed from the upper impoundment of the system interacts with clean gas in the upper part of the reaction chamber. The discharged carbon at the lower part of the reaction chamber interacts with exhaust gases from the inlet in a counter flow, so that the activated carbon is used efficiently and economically.
3) The system is simply configured, with a sliding carbon discharge device that is periodically activated.
4) Since effluent (used) activated carbon is in an oxidized decomposed state and processed at high temperature in the incinerator, dioxins are not emitted outside the system.
5) Is effective for absorbing and eliminating even non-regulated substances other than mercury and dioxins. In Europe the system is called a police filter and is used in the final stages of exhaust gas cleaning processes.
6) Activated carbon used for the system is Ebara's Ebadia AG-400X.

- High absorption elimination of dioxins can be achieved with numerous micropores and mesopores (intermediate pores).
- Pellet-like special molding technology results in lower ventilation resistance.
- High physical strength results in superior handling.
- An ignition point higher than 450ºC, ensures a superior safety level.

Flow Sheet

Equipment

3. Performance

The actual elimination rate of dioxins is greater than 99%.

Dioxin Removal Efficiency

4. Adaptive Field and Objects to be Treated

Exhaust gases from industrial waste incineration plants.

5. Others

The system has been in service at municipal waste incineration plants since 1998.