Minnesota Public Radio reports on an effort in Brainard, Minnesota to recover the energy in sewers. The Hidden Fuels group has been monitoring the temperatures of the city sewers to determine if it is feasible to use this heat energy to reduce the cost of heating buildings. Essentially a closed loop heat pump system would be installed in the sewer system. They would need to overcome problems working with a contaminated water system. More information is provided by CERT (Clean Energy Resource Teams).
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| Earl Wolleat photo by Ann Schwartz http://www.cleanenergyresourceteams.org/blog/could-waste-heat-sewers-heat-buildings-untapped-energy-flowing-under-brainerd |
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