Takashi Nishitani*, Isao Fukunaga*, Hisao Itoh* and Tomohiro Nomura**

*Osaka City Institute of Public Health and Environmental Sciences
**Department of Mechanical Engineering, Faculty of Engineering, Osaka City University

+ Correspondence should be addressed to Takashi Nshitani:
(8-34 Higashiue-cho, Tennoji-ku, Osaka-city, Osaka 543-0026 Japan)

Abstract

On-site Bench scale experiments on the removal of mercury from the flue gas of municipal solid waste incinerators using fly ash were performed at site. The fly ash, which was collected from the electrostatic precipitator without using Ca (OH) 2 spray and which consisted of only dust derived from refuse, had a high mercury removal efficiency. The removal efficiency was most greatly influenced by the temperature parameter. Fly ash gave a high removal efficiency up to 200*C[Celsius degeree], but the efficiency dropped quickly at 250*C[Celsius degeree] due to the presence of steam. Both HgCl2 and Hg0 could be removed with high efficiency and even steep peaks of highly concentrated mercury were effectively removed. According to the results of continuous experiments, Hg removal efficiency was more than 85% for 2 hours at 180*C[Celsius degeree] using fly ash.The above experimental results proved that the removal of mercury from flue gas using fly ash was very effective.

Key words: municipal refuse incinerator, flue gas treatment, mercury, fly ash, fabric filter