Codigestion: A Developing Trend and Market

One reason for the increased interest in codigestion is the creation of opportunities for the use of biodegradable wastes due to the tremendous number of AD plants online and currently being constructed

Applied Technologies, Inc.

by Dennis Totzke

Codigestion is a term heard often these days, and a concept that will likely increase in popularity as we move through the current tense times towards a friendlier, more renewable economy.

In general, codigestion refers to the anaerobic digestion (AD) of multiple biodegradable substrates (feedstocks) in an AD system. The more contemporary definition refers to the digestion of a combination of select biodegradable feedstocks with a base substrate that an AD system was designed to handle. The general idea is to maximize the production of biogas in an AD plant by adding substrates that produce much more biogas per unit mass than the base substrate. Two readily available substrates – municipal biosolids and agricultural manure – are the base substrates most often utilized and are located near the bottom of the “biogas per unit mass” scale. However, the benefits that can be realized from codigestion, as well…

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