Biogas & RNG Online – March 2026
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ADM1: A Digital Twin of the Biogas Digestion Process
ADM1: A Digital Twin of the Biogas Digestion Process
ADM1 is a scientific model that describes how organic waste is transformed into biogas inside an anaerobic digester, but in simple terms it works like a virtual digestion system: you feed it waste, and it predicts how bacteria break it down step by step, how much methane and CO₂ are produced, and how the internal chemistry evolves over time. It groups the process into stages—hydrolysis, acid formation, and methane formation—and uses equations to simulate how each group of microorganisms behaves. ADM1 is like a digital twin of a biogas reactor, helping you understand, test, and optimize digestion performance without touching a real tank.
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Since its inception more than 20 years ago, ADM1 has struggled with food waste and heterogeneous materials. Works reasonably well for nice homogenous sewage sludge. We’ve found the first‑order or Monod‑type hydrolysis kinetics, which assume 1) uniform particle accessibility, 2) constant surface area, and no physical disintegration limits breaks down badly for FOG-rich feeds, pulped SSO, and other complex feeds. ADM1 also seems quite limited when addressing LCFA-inhibition or toxicity.
And the biggest limitation in my experience is that all the models fail to account for microbial acclimation and adaptation over time. Ammonia inhibition being the most common example in full-scale plants. We see many running at total ammonia concentrations that the textbooks say is impossible!
ADM1 Model can also help us to understand microbial dynamics in two stage Anaerobic digestion process which release a lot of feedback inhibition because of product buildup. We tried working with daily effluents treatment by using anaerobic reactors.
We have developed a GUI (python based) version that makes working with ADM1 simple and intuitive. Feel free to contact me if you would like a demonstration.
https://sites.google.com/gazeol.com/about-us/broshures_brochures/adm1_gui
sites.google.com
hatem.yazidi@gazeol.com - ADM1_GUI
A Python code was created to make this plot. The Python code simulates the natural decomposition of organic material under anaerobic conditions, mimicking processes that occur in nature. Specifically, it models how a given mixture of substrates, such as monosaccharides, … Continue reading
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