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HIGHLIGHTS• Flammability parameters of sludge are presented.• Relationships between chemical and flammability properties of sludge are analyzed.• Physical and chemical properties of sludge dusts affects their explosibility.• Seasons and origins of sludge should lead to a differentiation among samples. ABSTRACTThe treatment and disposal of sewage sludge is becoming an urgent need whereby different technologies were developed and integrated into the waste cycle all over the world. One ofthe most used technologies is the thermal drying ofthe sludge. Thermally dried sewage sludge has interesting properties that allow its use as an alternative fue!, but also needs some consideration from the point of view of its safe operation.The aim ofthis study was the research on the flammability properties of sewage sludge, including ignition sensitivity, explosion severity, thermal sensitivity and thermal stability. Furthermore relationships among those properties and composition parameters have been determined, added to the study of their variation depending on their origin or season. Finally, properties related to spontaneous combustion were determined. To study these relationships and characteristics sludge samples were selected from different locations in Spain and taken during different seasons.

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