This article is the first of a two-part series, published by EM Magazine, a copyrighted publication of the Air & Waste Management Association. Look for part two, coming in May.
Renewable natural gas is an increasingly important and valuable fuel product that can be generated from organic materials that are otherwise wastes such as municipal solid waste, sewage sludge (biosolids), and animal manure. Processing these waste materials via anaerobic digestion produces methane-rich biogas. With sufficient upgrading of the biogas to meet the quality standards (as defined in tariffs) for injection into traditional natural gas pipelines, the resulting RNG becomes a viable substitute for, and indistinguishable from, conventional natural gas.