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ABSTRACTCombustion of sewage sludge was conducted in a laboratory-scale drop tube furnace to investigate the emission characteristics of PM10 (particles with the aerodynamic diameter smaller than 10 μm). The experiment temperature was varied from 1173 to 1573 K. The results show that the emissions of submicron particulate matters (PM1, particles with the aerodynamic diameter smaller than 1 μm) and supermicron particulate matters (PM1–10, particles with aerodynamic diameter ranging from 1 μm to 10 μm) both decrease with temperature increasing. Meanwhile, the morphology of PM10 was also analyzed by X-ray fluorescence (XRF) and scanning electron microcopy (SEM) to further understand its formation mechanisms. The results indicate that PM1 is mainly formed from the vaporization and condensation process and its major elemental compositions are Na, S and P, while the agglomeration of melting minerals and the fragmentation of minerals contribute to PM1–10, which is chiefly composed of Si, Al and Ca.

Emission Characteristics of PM10 during Sewage Sludge Combustion