Abstract
Heating experiments were carried out to investigate the formation of unintentionally produced persistent organic pollutants (POPs) at low temperature in fly ash samples collected from fabric filters equipped with aluminum alloy smelting furnaces for the elimination of the releases of these by-products from the plants. The results showed that POPs largely increased in fabric filters below 200℃. It was assumed in the experiments of water-washing fly ash samples that POPs were mainly formed at sufficiently low temperature through catalytic reactions of hydrocarbons in fly ash with water-soluble chlorinated compounds such as potassium chloride. This indicated the possibility that unintentionally produced POPs formation was reduced by adding water into fly ash in fabric filters.
