Reference : Sludge digestion instead of aerobic stabilisation – a cost benefit analysis based on ...
Scientific journals : Article
Engineering, computing & technology : Civil engineering
http://hdl.handle.net/10993/17485
Sludge digestion instead of aerobic stabilisation – a cost benefit analysis based on experiences in Germany
English
Gretzschel, Oliver []
Schmitt, Theo G. []
Hansen, Joachim mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
Siekmann, Klaus []
Jakob, Jürgen []
2014
Water Science & Technology
IWA Publishing
Yes (verified by ORBilu)
0273-1223
London
United Kingdom
[en] biogas ; cost functions ; digestion ; economics ; energy efficiency ; energy turn-around
[en] As a consequence of a worldwide increase of energy costs, the efficient use of sewage sludge as a
renewable energy resource must be considered, even for smaller wastewater treatment plants (WWTPs) with design capacities between 10,000 and 50,000 population equivalent (PE). To find the
lower limit for an economical conversion of an aerobic stabilisation plant into an anaerobic stabilisation plant, we derived cost functions for specific capital costs and operating cost savings.
With these tools, it is possible to evaluate if it would be promising to further investigate refitting
aerobic plants into plants that produce biogas. By comparing capital costs with operation cost
savings, a break-even point for process conversion could be determined. The break-even point varies depending on project specific constraints and assumptions related to future energy and operation costs and variable interest rates. A 5% increase of energy and operation costs leads to a cost efficient conversion for plants above 7,500 PE. A conversion of WWTPs results in different positive effects on energy generation and plant operations: increased efficiency, energy savings, and on-site renewable power generation by digester gas which can be used in the plant. Also, the optimisation of energy efficiency results in a reduction of primary energy consumption.
http://hdl.handle.net/10993/17485

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