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Updated: May 3, 2026

Continuously-stirred Anaerobic Digester to Convert Organic Wastes into Biogas: System Setup and Basic Operation
Published on: July 13, 2012
Model based analysis of trace metal dosing strategies to improve methane yield in anaerobic digestion systems
Susan George1, Maria Rosaria Mattei2, Luigi Frunzo2
1Department of Mathematics and Applications "Renato Caccioppoli", University of Naples Federico II, Naples, Italy; Instituto de la Grasa, Spanish National Research Council (CSIC), Seville, Spain.
Abstract:
Favourable effects of trace metals (TMs) on regulating anaerobic digestion (AD) performance are extensively utilised to improve methane yield. This study discusses a model-based approach to find out the best TM dosing strategies. The model has been applied to compare continuous, preloading, pulse dosing and in-situ loading. Simulations were also carried out to comprehend appropriate dosing form, dosing time and quantity of metals to be dosed. Model results show that the best way to dose TMs is repeated pulse dosing at low concentration levels in the optimum range with high frequency. Best dosing strategy for the system in this study was found to be 5 µM pulse loading at 5 days intervals as it gave maximum methane production and low effluent metal loss. Preferable dosing form depends on reactor configuration and this has been verified after model calibration with experimental data. Easily dissociable metal chlorides are ideal for continuous reactors.
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