Efficiency in action

Published:  06 October, 2017

Seepex.jpgSEEPEX SAYS energy generation from the anaerobic digestion of sewage sludge has reached 888 GWh, according to the 2016 Digest of UK Energy Statistics – an increase of over 25% since 2011. Yet over the same period the installed theoretical MWe capacity has grown by just9%. How has the energy generated increased so dramatically and is the trend for efficiency improvements set to continue?

One of the biggest changes is the use of high temperature heat treatment, of sludge. This makes the sludge more biodegradable and enables the loading rates to the anaerobic digesters to be doubled, delivering a higher gas yield. A further benefit is that the final sludge from the digester is pathogen free and can be easily dewatered, resulting in a more valuable final product for land application.

Currently, most sewage sludge is treated by water authorities in their own large, centralised treatment centres, which take dewatered sludge from their smaller satellite treatment works. Raw sewage can constitute up to 99% water and the satellite sewage treatment processes remove this water and thicken the sludge before dewatering to a dry solids content (ds%) of between 18-35 %. Dewatering reduces the sludge volume and in turn the transport costs of transfer to the larger treatment centres. Visit the PWE website for the full release to read what is behind the UK’s booming sewage sludge sector?

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Read the full release her Efficiency in action - what's behind the UK's booming sewage sludge sector_SEEPEX_short final.doc

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