This paper asks how much heat could be recovered from wastewater treatment plants under UK climatic conditions, and can this heat be used effectively to reduce their carbon footprint? Four wastewater treatment sites in southern England have been investigated and the available heat quantified. Issues relating to the environmental, economic and practical constraints on how this energy can be realistically recovered and utilised are discussed. The results show there is a definite possibility for thermal energy recovery and demonstrates that the financial feasibility of three options for using the heat (either for district heating, sludge drying or thermophilic heating in sludge digestion processes) is highly dependent upon the current shadow price of carbon. Without the inclusion of the cost of carbon, the financial feasibility is significantly limited. An environmental constraint for the allowable discharge temperature of effluent after heat extraction was found to be the major limitation to the amount of energy available for recovery. The paper establishes the true potential of thermal energy recovery from wastewater in English conditions and the economic feasibility of reducing the carbon footprint of wastewater treatment operations using this approach.
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Research Article|
December 01 2012
The potential for thermal energy recovery from wastewater treatment works in southern England
Christopher Hawley;
Christopher Hawley
1The Carbon Trust, London, UK
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Richard Fenner
2Centre for Sustainable Development, Department of Engineering, Cambridge University, Trumpington Street, Cambridge, CB2 1PZ, UK
E-mail: raf37@cam.ac.uk
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Journal of Water and Climate Change (2012) 3 (4): 287–299.
Article history
Received:
February 27 2011
Accepted:
March 16 2012
Citation
Christopher Hawley, Richard Fenner; The potential for thermal energy recovery from wastewater treatment works in southern England. Journal of Water and Climate Change 1 December 2012; 3 (4): 287–299. doi: https://doi.org/10.2166/wcc.2012.013
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Impact Factor 1.900
CiteScore 2.4 • Q2
33 days from submission to first decision on average