In the production of renewable energy, activated carbons are used for the removal of various unwanted gas phase contaminants, either for engine protection in combined heat & power (CHP) generators, or for the purification of biomethane prior to injection into the grid or use as a vehicle fuel.
Biogas is methane formed by the anaerobic digestion (AD) of organic material. Biogas can be formed from various sources:
– AD facilities running on agricultural waste, so-called ‘energy crops’, or municipal/industrial food waste
– The digestion of sewage sludge at wastewater treatment plants (WWTP)
Contaminants that typically require removal from the biogas stream will depend on the nature of the organic waste, but typically include:
– Siloxanes, which commonly occur in consumer products and can cause deposition of silica inside CHP engines
– Hydrogen sulfide (H2S) which is odorous and toxic, and can react with moisture to form corrosive acids
– Various other odorous compounds and VOCs, such as ammonia (NH3) and limonene
CPL Activated Carbons is a leading supplier of carbons and services into the renewable energy sector.
– Activated carbons, typically extruded pellets or larger-sized GAC. For siloxanes and VOC removal these are standard pellets, whereas for H2S and NH3 we offer specially impregnated grades.
– For biomethane applications, where very low levels of moisture are required in the final gas stream, we offer a super-dried grade of regenerated extruded pellet, called Filtracarb® EXR4-D
– A range of VOCSorber® mobile carbon filters, typically 2m3, 5m3 or 30m3
– Regeneration of spent carbons at our ‘amber list’ reactivation facility in the UK, one of the largest such facilities in Europe
– Sites services, including carbon/filter installation and changeout operations
– Engineering support for filter design, attachments and operational advice