Influence of operation conditions and additives on the development of producer gas and tar reduction in air gasification of construction woody wastes using a two-stage gasifier

► Use of a two-stage gasifier in an air gasification of construction woody biomass. ► Use of activated carbon and olivine to reduce tar generation in the system. ► Influence of the amount of activated carbon on gas composition. ► Influence of the amount of activated carbon on tar removal. ► Reusability of spent activated carbon.