Can we turn sewage 'sludge' into something valuable?

Over the past few years I have become an academic expert in "sewage sludge" – the residual, semi-solid mix of excrement packed with microorganisms that is left behind within wastewater treatment plants. Every year the UK alone produces approximately 1.4m tonnes of the stuff. About 80% of it is spread on fields as manure, but this still leaves us with a headache – what do we do with the rest?

from Phys.org - latest science and technology news stories http://bit.ly/2WdOJ0O

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