Use of activated carbon to help densify methane gas in terms of storage; so that large energy amounts can be transported in cylinders to a use site is a response I got in my quest for the possible ways of packaging biogas.
Can you throw more light in terms of how to generate the activated carbon and how to use it in densifying the methane gas produced.
Outside United States
This is an area I do not have expertise in, and I am not sure who to refer you to. I do not know how quickly you need an answer, but if you can give me some time I can try to find information to answer your question. I actually have the same question, and they answer may have some relevance to a project I am working on.