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• Pyrolysis and combustion experiments were performed on an actual Russian mixed sludge. • Kinetic modeling was performed using the Extended Independent Parallel Reaction model. • For pyrolysis, the five activation energies lie between 78 and 231 kJ/mol. • The activation energy associated with the char combustion is found equal to 280 kJ/mol. • Gaseous emissions during combustion experiments well superimpose with mass loss rates. The Arkhangelsk Region, North-West of the Russian Federation, has an important pulp and paper production whose plants generate industrial sludge which is mixed with municipal sludge. Thermal degradations under nitrogen or synthetic air of this mixed sludge were performed under four low temperature ramps of 5, 10, 15 and 20 °C/min. Kinetic modeling of the pyrolysis and combustion experiments was performed applying the Extended Independent Parallel Reaction model with five constituents. Different error measurements were computed to validate the optimal values of the kinetic parameters. Complementary combustion experiments were performed in a horizontal oven to continuously measure the main gaseous emissions (CO, CO 2 , THC, NO and NO 2). The NO and NO 2 emissions were observed at very low amounts. The curves associated with the CO, CO 2 and THC emissions were observed to well superimpose with the mass rate curve of the corresponding combustion experiment performed in the thermobalance, but with a small time delay. [ABSTRACT FROM AUTHOR]