We have talked about combining waste matter and producing bioethanol using wastes that are difficult to convert into fuel. I was referring particularly to the mixture of green waste and municipal sewer sludge, for example. We have already investigated this option at the research institute where I used to work. We are also considering combining waste water from the starch industry, with waste matter such as municipal sewage sludge.
On February 25th, 2008. See this statement in context.