Simultaneous catalytic reduction of N 2 O and NO x produced in a fluidized bed incineration of sewage sludge

Fluidized bed incineration of sewage sludge could produce large amounts of N 2 O due to the relatively high nitrogen content of the sewage sludge and low incineration temperatures. In this study, N 2 O and NO x emissions released during the fluidized bed incineration of dried sewage sludge powder were investigated. Sewage sludge feeding rate was about 8∼10 kg/h, and bed aspect ratio was fixed to ca. 1.2. Superficial velocity was adjusted to ca. 1.9 m/s. The concentrations of N 2 O and NO x in the exhaust gas were greatly influenced by bed temperature in a range between 850 °C and 950 °C. In the simultaneous catalytic reduction of N 2 O and NO x on an Fe/BEA pellet catalyst with NH 3 , most of the N 2 O and NO x were removed when heated above the inlet reaction temperature 410 °C. Thus, simultaneous catalytic reduction was shown to be a promising N 2 O abatement technology for the fluidized bed incineration of sewage sludge. © 2015 Society of Chemical Industry and John Wiley & Sons, Ltd