ANAEROBIC DIGESTION Xergi
| Pioneers of innovation
As pioneers of AD, Xergi has more than 25 years’ experience working in the sector. The company’s innovative approach has earned it an excellent track record building biogas plants in Europe and the USA, says Jørgen Fink, at Xergi
B
ack in the 1908s Danish farmers, engineers and inventors started to learn about anaerobic digestion (AD) the hard
way from scratch. Out of this grew Xergi, created by two large industrial foundations, with the purpose of taking AD to a new level of innovation based on science, commercial strategy and strong finances. Xergi has retained its pioneer spirit, and has a solid foundation of more than 25 years’ experience working with AD, including building more than 60 biogas plants in Europe and USA.
Variety of feedstock The Xergi plants are all individually designed and configured to meet the requirements and needs of the clients. Even though the set- up is customised, the input system retains a versatility that ensures the plant can manage changes in the availability of different types of biomasses. The Xergi plants are able to process almost any type of organic matter like animal slurry, deep litter, energy crops, vegetable waste, industrial and commercial waste as well as household waste. Xergi has a unique feeding system, FlexFeed®
, which ensures a precise feeding and flexibility. The Xergi design philosophy
l Staples Vegetables creates new value from surplus vegetables. The total capacity is 7 MW electricity, and the digestate is used as a valuable fertilizer. l The Barkip plant digests food waste from households and supermarkets, but also industrial waste and manure. l The Retford biogas plant is designed to digest large amounts of nitrogen rich poultry manure.
is to run the plants at the optimum temperature for the feedstock which can be any temperature between 37 and 52°C. The digester and agitation system is designed such that the content of the digester is fully mixed, which also reduces the risk of creating a floating layer and sedimentation. Furthermore, the design ensures a low operation cost with a minimum of energy. The SCADA system is a key element in
Xergi’s biogas plants. It is built in-house and based on many years of experience, and described as very user-friendly by customers.
Xergi plants in the UK Xergi has delivered six operational plants in the UK, with a total power output of more than 14 MW. Two more are under construction and several more are in the planning and development stages. The first plant was built for Staples
Vegetables in Lincolnshire, and commissioned in 2010. This plant was originally constructed
20 REview Renewable Energy View 2015
as a 1.4 MW plant but has since been expanded and the output is now 5 MW electricity. Furthermore, Xergi has built a new plant for Staples on a second site with 2MW output. The Staples plants mainly runs on surplus vegetables as well as maize silage. Another Xergi plant is the Scottish and
Southern Energy biogas plant at Barkip, close to Glasgow. This plant is mainly running on food waste from households, supermarkets and the like as well as industrial waste and some manure. The power output is 2.1 MW. Xergi has also built a 0.5 MW plant for
Bernard Matthews to process the waste from their turkey abattoir. Last year Xergi finished two plants for Tamar Energy, including Holbeach, a 1.5 MW plant processing potato and other vegetables wastes and maize silage, and a plant in Sutton Grange, Retford, which is at the final commissioning stage. The Retford plant with 3 MW power output includes Xergi’s patented NiX®
, technology
which allows processing of large amounts of nitrogen rich poultry manure. All the operating plants in the UK are combined heat and power (CHP). However, Xergi is now building biogas plants in Denmark and Sweden where the biogas is upgraded to bio-methane in order to replace the use of fossil natural gas in households, industry and vehicles.
FOR FURTHER INFORMATION Please contact Jørgen Fink, Xergi Ltd at
jfi@xergi.com Tel: 01483 600 098.
www.xergi.com
www.r-e-a.net
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