Pyrolysis of sewage sludge in a fixed and a bubbling fluidized bed – Estimation and experimental validation of the pyrolysis time

•Pyrolysis of sewage sludge in a fixed and a fluidized bed is studied.•The evolution of the mass released by the sample during pyrolysis was measured.•The effect of the bed temperature and gas velocity on the pyrolysis was analyzed.•Sewage sludge pyrolysis time was experimentally obtained for each o...

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