Biogas desulphurisation cuts costs at Cory AD plant 05 December 2013

Commissioning of a microbiological desulphurisation system at the Cory Waste Management site, in Weston-super-Mare, is the culmination of collaboration between Uniflare, the Warwickshire-based environmental technology firm, and Allison Engineering.

Uniflare's landfill and waste gas control equipment, combined with Allison Engineering's gas analysers, has enabled Cory Waste Management to protect its CHP (combined, heat and power) plant at minimal installation and operational cost.

Allison Engineering supplied its AWITE biogas analyser, which has its own air compressor and uses PID (three-term) and fuzzy logic control to automate the injection of small quantities of air (0.5 to 1%) into the gas stream in the digester.

That converts hydrogen sulphide (H2S) in the biogas (from anaerobic digestion) to elemental sulphur and water, thus protecting the CHP engine from corrosion otherwise caused by its breakdown into weak sulphuric acid during burning.

One of the most common ways of reducing H2S concentration is to inject iron chloride into the digester slurry or feed substrate, which converts the H2S to iron sulphide particles. But that requires costly additional process controls, with dedicated pumps and storage vessels.

"Maintaining H2S concentration levels to less than 300ppm is an essential part of this process," states James Hladkij, AD technician at the Cory Waste Management site.

"The Uniflare system has enabled us to achieve levels of less than 100ppm and at minimal operational cost."

Brian Tinham

Related Companies
Allison Engineering Ltd
Uniflare

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