Yes. For CWT in specific, the original articles (in popular science magazines like Discover or PopSci) described the desire to process various kinds of plastic

Yes. For CWT in specific, the original articles (in popular science magazines like Discover or PopSci) described the desire to process various kinds of plastics, much like the linked article talks about. The methane would be tapped off early, and used the power the production process, with the end product being various kinds of oils. It wasn't clear why CWT decided to pivot to processing turkey waste. They were hamstrung by fluctuating prices for the waste stream, that (IIRC) could be used as an input for fertilizer production.