The technology for conversion of cereal straw to renewable gas already exists, with experience of both anaerobic digestion, gasification and combustion being readily available from a number of ‘Tier 1’ original equipment manufacturers and delivery partners around the world.
Regional Development Victoria is currently supporting Valorify to progress the project through to FEL 2 completion (due early June 2023).
Secondly, the concept is generally based on what is referred to as ‘industrial ecology’, where process inputs and outputs are exchanged between a number of co-located businesses, all which receive a benefit in terms of energy cost, carbon abatement and waste minimisation, for example. A lower cost of operating and ‘best practice’ Circular Economy precinct will attract new investment and employment to the region, thereby making these businesses more domestically and internationally competitive.
The mineral content of the straw (technically referred to as the by-product known as “ash”, post-combustion) is recoverable from a thermal conversion process, while the digestion of organic materials typically yields a nutrient-dense, “digestate” that can be re-distributed to the land. Either of these by-products, and potentially biochar also (subject to final design and financial viability), have the potential to be returned to the soil via the supplier network, ensuring that both carbon and nutrient is returned and built up in the landscape, consistent with the ‘Circular Economy’ orientation of the project overall. This also has the potential to offset fertiliser costs too, but the extent to which this is achievable will of course vary from farm to farm, based on land management practices, quality and formulation of the end product and the rate of application, amongst other variables.