A power plant arrangement, comprising: at least one main air compressor for compressing ambient air into a compressed ambient gas flow; and at least one gas turbine assembly, comprising: a turbine combustor, fluidly connected to the main air compressor, for mixing at least a first portion of the compressed ambient gas flow with at least a first portion of a recirculated low oxygen content gas flow and a fuel stream to form a combustible mixture and for burning the combustible mixture and forming the recirculated low oxygen content gas flow; a turbine connected to the turbine combustor and to a turbine shaft, and being arranged to be driven by the recirculated low oxygen content gas flow from the turbine combustor; a turbine compressor, fluidly connected to the turbine combustor, and connected to the turbine shaft and being arranged to be driven thereby; a recirculation loop for recirculating of the recirculated low oxygen content gas flow from the turbine to the turbine compressor; a recirculated gas flow extraction stream for extracting at least a second portion of the recirculated low oxygen content gas flow from the at least one gas turbine assembly; characterised in that it further comprises delivering the at least a second portion of the recirculated low oxygen content gas flow to a carbon monoxide catalyst unit; and at least a second portion of the compressed ambient gas flow is directed from the at least one main air compressor to the carbon monoxide catalyst unit. at least one main air compressor for compressing ambient air into a compressed ambient gas flow; and at least one gas turbine assembly, comprising: a turbine combustor, fluidly connected to the main air compressor, for mixing at least a first portion of the compressed ambient gas flow with at least a first portion of a recirculated low oxygen content gas flow and a fuel stream to form a combustible mixture and for burning the combustible mixture and forming the recirculated low oxygen content gas flow; a turbine connected to the turbine combustor and to a turbine shaft, and being arranged to be driven by the recirculated low oxygen content gas flow from the turbine combustor; a turbine compressor, fluidly connected to the turbine combustor, and connected to the turbine shaft and being arranged to be driven thereby; a recirculation loop for recirculating of the recirculated low oxygen content gas flow from the turbine to the turbine compressor; a recirculated gas flow extraction stream for extracting at least a second portion of the recirculated low oxygen content gas flow from the at least one gas turbine assembly; characterised in that it further comprises delivering the at least a second portion of the recirculated low oxygen content gas flow to a carbon monoxide catalyst unit; and at least a second portion of the compressed ambient gas flow is directed from the at least one main air compressor to the carbon monoxide catalyst unit. a turbine combustor, fluidly connected to the main air compressor, for mixing at least a first portion of the compressed ambient gas flow with at least a first portion of a recirculated low oxygen content gas flow and a fuel stream to form a combustible mixture and for burning the combustible mixture and forming the recirculated low oxygen content gas flow; a turbine connected to the turbine combustor and to a turbine shaft, and being arranged to be driven by the recirculated low oxygen content gas flow from the turbine combustor; a turbine compressor, fluidly connected to the turbine combustor, and connected to the turbine shaft and being arranged to be driven thereby; a recirculation loop for recirculating of the recirculated low oxygen content gas flow from the turbine to the turbine compressor; a recirculated gas flow extraction stream for extracting at least a second portion of the recirculated low oxygen content gas flow from the at least one gas turbine assembly; characterised in that it further comprises delivering the at least a second portion of the recirculated low oxygen content gas flow to a carbon monoxide catalyst unit; and at least a second portion of the compressed ambient gas flow is directed from the at least one main air compressor to the carbon monoxide catalyst unit.