Is sewage sludge a fuel or a waste?

In the context of current UK energy and waste management policy, British scientists have analysed different technology scenarios permitting the co-combustion of sewage sludge. The results suggest that sewage sludge can be considered as a fuel, since all the scenarios studied provided net energy gains. However, the lack of a clear legal definition of what waste actually is, affects the development of sustainable sewage sludge management strategies.

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