A remediation method includes: introducing a contaminated medium into a heating chamber (20); heating the contaminated medium in the heating chamber (20) by means of a stream of hot air and by microwave radiation to a temperature of at least 600 °C; purifying exhaust gas, emitted from the heating chamber (20), in a catalytic combustion unit (30) at a temperature of at least 800 °C to outlet purified gas; generating a stream of a heated air in a heat exchanger (40), by transferring the heat from the purified gas from the catalytic combustion unit (30); and introducing the stream of heated air from the heat exchanger (40) to the heating chamber (20).
