The Aemetis Biogas dairy digester and pipeline project is expected to begin first gas production in September 2020 and our planned deployment of the patented LanzaTech cellulosic ethanol technology at the Riverbank plant has positioned Aemetis to rapidly produce expanding positive cash flow from the production of high-grade sanitizer alcohol as well as low carbon, clean burning high-performance renewable fuels from abundant low-cost waste biomass feedstocks.
In the context of the input sentence, determine the relationship between 'digester' and 'Biogas'.
Options: product/material produced, manufacturer, distribution format, owned by