PHOTOOXIDATION OF EXHAUST POLLUTANTS - PHOTOOXIDATION AND PHOTOREDUCTION OF POLYCHLORINATED DIBENZO-P-DIOXINS AND DIBENZOFURANS ON FLY-ASH

The photochemical decomposition of polychlorinated dibenzo-p-dioxins a nd dibenzofurans was investigated on fly-ash particles from municipal solid waste. Photodegradation experiments were performed in the solid phase by direct irradiation with medium and low pressure mercury lamps in an oxygen/ozon atmosphere under oxidizing conditions and in an nit rogen/ammonia atmosphere under reductiv conditions. Qualitative and qu antitative analysis was performed by GC/MS-spectroscopy. The degradati on efficiency mainly depends on the effective irradiation time but als o on the reaction temperature and to a small degree on the power outpu t of the W-lamp. The degradation rates were investigated in special re action chambers under different conditions and with various additives and lead to a maximum value of about 70%. Copyright (C) 1996 Elsevier Science Ltd