What is the relationship between digester and Biogas in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

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.

Answer: product_or_material_produced