Enhancement of anaerobic methanogenesis from napiergrass by addition of micronutrients

Mesophilic anaerobic digestion of Napiergrass (Pennisetum purpureum Schum.), supplemented with nitrogen and phosphorous, resulted in a low rate of methane production and high volatile fatty acid (VFA) concentrations. Daily addition of micronutrients — nickel, cobalt, molybdenum, selenium and sulfate (as a sulfur source) — increased methane production by approximately 40% and significantly decreased the VFA concentrations.

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