CASE STUDIES


CRS supports biodigester roll- out as UK expands national energy-from-waste capacity


Carrier Rental Systems is supplying high performance temporary cooling and heating equipment to support the UK’s rapidly expanding energy-from-waste biodigester facilities.


B


iodigester plants harness natural biological processes using bacteria to breakdown organic matter to produce methane. The gas is then used as a fuel source to generate electricity. The benefit is that food and agricultural waste that would otherwise be sent to landfill can be used to produce clean energy.


When new plants are commissioned, an external energy source is required to warm the organic feed stock within the biodigester, to


72 June 2017


initiate biological activity. Once this process becomes established, it produces its own heat as a result of the biological activity and becomes self-perpetuating.


A temporary heating source, therefore, is required during the start-up phase to prime the system. Carrier Rental Systems is supplying packaged boiler plant, buffer tanks and associated pipework on a hire basis for this purpose to several new energy-from-waste plants around the country.


In one recent example, the company supplied a hire boiler package to a biodigester project at Forres, in the north of Scotland. A Carrier Rental Systems’ 250kW boiler was used over a six week period during its commissioning phase to gradually raise the temperature within the digester tanks to 45degC, at which point the system produced enough power to initiate the onsite generator.


Biological activity in a digester may sometimes stall, due to a problem with the


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