Even on the coldest days, sewage is warm. Thus, it can be a source of heat for buildings and water heating. For many buildings, 20% or more of the energy used is flushed down the drain. We can, and should, "recycle" that heat.https://www.denverpost.com/2020/08/04/sewer-pipes-dirty-water-national-western-center-clean-energy/ …
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