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Operations · Science
An anaerobic digestion plant is a living process, not a machine. It performs or fails on biology, feedstock and the chemistry inside the tank, long before it shows up in the gas meter. This is the operational reality Redrock designs and troubleshoots from.
What actually decides performance
A digester goes off long before the gas flow tells you. The early signals are chemical: the volatile fatty acid to alkalinity ratio climbing, ammonia rising into inhibition, hydrogen sulfide loading the biology. Reading those trends, not reacting to a crashed plant, is what keeps uptime.
Methane is made by a food chain of hydrolysers, acidogens, acetogens and methanogens, each with its own tolerances. Sulfate-reducing bacteria compete for substrate and generate H2S. Design and troubleshooting start from that biology outward, not from the equipment datasheet inward.
Biochemical methane potential testing to VDI 4630, at a sound inoculum-to-substrate ratio, turns a feedstock claim into a design number. Take the P90, not the headline yield, and the plant is sized against what the biology will actually deliver.
Water scrubbing, pressure-swing adsorption, membranes, amine and emerging sorbent routes each trade capital, parasitic load, methane slip and footprint differently. The right choice depends on scale, the gas market and the site, not on a single favoured technology.
The Redrock approach
Most plant problems are biological problems wearing a mechanical disguise. We design, commission and troubleshoot from how the biology behaves under real feedstock, real contamination and real seasonality, then specify the equipment to serve it.
That discipline is what lets us tell where anaerobic digestion is the right answer, where an existing plant can be recovered, and where the feedstock belongs on a different route entirely.
Whether it is a new project or an existing digester that is underperforming, let us talk about the biology first.
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