When using biomass for energy, two popular options are reactors and gasifiers. The first uses anaerobic micro organisms to convert the biomass to fertilizer and a methane rich gas mixture. The second uses heat to pyrolyze the biomass into ash and a carbon monoxide and hyrdogen rich gas mixture.
In terms of the overall potential energy produced by their resulting gas mixtures, is there an efficiency difference between the two?
For example, if you left one unit of wood in a digestor/reactor and let it sit until it was completely consumed by the system would the resulting amount of methane rich gas have more potential energy than if we ran that same unit of wood through a gasifier and captured the resulting amount of carbon monoxide and hyrdogen rich gas.