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CreChar - Model Site E -CHP Plant for Anaerobic Digestion
CreChar is a specialized additive designed for anaerobic digestion operations, facilitating enhanced biomethane production. This additive is supplied in 25 kg digestible bags for straightforward daily integration into solid feed hoppers. Despite the initial feedstock's biogas potential remaining unchanged, CreChar enables a 3-4% increase in methane concentration and an 8% boost in total biomethane yield. Furthermore, it assists in stabilizing digestion processes by reducing ammonia levels up to 10%, thus safeguarding plant biology against fluctuations in feedstock mixes, including high-liquid waste and variable inputs like chicken litter. During trials, an additional 851,696 kWh was generated, illustrating a significant increase in renewable energy yield and potential revenue enhancement, with modelled savings and higher returns per annum. CreChar permits operators to explore various low-cost feedstock strategies without performance loss, supporting long-term plant resilience amidst evolving economic and regulatory landscapes.
Site E is a CHP site which operates a Marches Biogas Double Ring digester on a mix of feedstocks, including Potato Peelings, Potatoes, Vegetable Waste, Chicken Manure, and Liquid Sugar.
Site Information
Site E is a well-run plant, already operating at around 90% efficiency. Despite this, the operator was keen to investigate solutions to increase efficiency for a new gas to grid site under development, using this trial to test CreChar’s potential for the future plant rather than immediate gains at this one. Crechar was added from the 18th of October 2024 until 30th March 2025.
Our Approach
We run our large-scale operations, following a proven process to maximise the outputs and collect data relevant for performance monitoring. We require minimum input from the operator at the same time offering our expert advice to add further value.
The Carbogenics team assess the sites operational and chemical data filling in any gaps where necessary.
CreChar is supplied in 25 kg digestible bags which are added to the solid feed hopper daily, resulting in no disruption to normal plant operation.
Feedstock Analysis
During the trial, the operator introduced a new feedstock mix – one of the more significant changes was the large increase in liquid starch. This shift increased the total feedstock volume by around 10%.
However, these additional cheap feedstock materials are less energy-dense and considered less desirable from an energy perspective. Therefore, overall biogas potential for the site remained unchanged.