Sewage sludge is usually the part nobody wants to think about. It is costly to handle, hard to get rid of, and after treatment, much of it still ends up in landfills. A Washington State University ...

However, conventional anaerobic digestion remains relatively inefficient, with the process typically converting less than 40% of the sludge's carbon into usable gas. Large amounts of carbon-rich ...

A pilot study of a new method for treating sewage sludge from a wastewater treatment plant efficiently created renewable natural gas while reducing the cost of the treatment. The work, reported in the ...