A tailgate lock-open system is provided in the form of a locking system for each tailgate opening cylinder of a rear discharging refuse collection truck body with a top hinged pivoting tailgate and having fluid-operated cylinders connected between the refuse collection body and the tailgate in which extension of the cylinder rods swings open the tailgate. The sulfuric acid andor nitric acid isare then removed from the gaseous carbon dioxide to produce SO2-free, NOx-lean carbon dioxide gas. The processing circuits include an interface control circuit which is connected to the external interface terminals, and a rewritable nonvolatile memory which is controlled by the interface control circuit.