Harvesting Energy from Wastewater

Have you heard of harvesting energy from wastewater? Apparently it’s already happening on a small scale. The city of Brainerd, Minnesota, has been using the heat from the sewer system to heat the Public Utilities Building and keep the sidewalks ice-free. A new partnership of the city, the school district, the public utilities, and a company called Hidden Fuels is now exploring the potential of using the waste heat in larger projects, such as the school system buildings, and at what scale the projects are cost effective.

It sounds at least moderately capital intensive to install, but it seems like an interesting variation of a district heating system. Here’s the story.


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