One of my theses involved the conversion of Honest-to-Goodness Solid Waste (HGSW) to energy.  The process made sense then- and makes even more sense now.  (Believe it or not, there’s only one company examining this process on a large scale, some 4 decades later.)   But, we also need to treat our liquid wastes (sewage)- because we want to keep our rivers and streams (which is where we discharged those treated waters) safe.  Amazingly, we employ about 2% of our energy supply to treat this waste stream.

Continue reading Sewage as an energy source? →

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