Analysis of pollutant emissions during circulating fluidized bed combustion of sewage sludge

Abstract

In this paper, pollutant emissions during air-CFB combustion of sewage sludge, wheat straw, Scots pine and bituminous coal are discussed. Combustion tests were carried out in a bench-scale circulating fluidized-bed reactor. Time-resolved profiles of emitted pollutants (NO, N2O, NO2, SO2 and CO) are presented and analyzed. The effects fuel type on gaseous emissions are evaluated. Due to the high contents of nitrogen, sulphur and ash in sewage sludge high concentrations of NOx and SO2 may be expected in the flue gas.