All Feedstocks which can be digested successfully in an anaerobic digestion plant must be organic, typically proteins, fats and carbohydrates.   Synthetic organics are mainly derived from petroleum and natural gas and are not suitable. The organic matter is decomposed by a series of bacteria in the absence of oxygen and the efficiency of the process is affected by the temperature of the digester, pH, Carbon/Nitrogen ratio, retention time and the presence of substances toxic to the bacteria.

Sewage Sludges have not been included because they are controlled under the Sewage Sludge Matrix, and would not normally be mixed with other organic wastes.  The treatment of industrial waste waters which is largely a remediation process designed to convert effluent to clean water is also not relevant to the feedstock survey.