What better way to spend your lunch hour than visiting the local sewage-treatment plant?

That’s not a joke – wastewater plants are fascinating places full of interesting engineering solutions and they usually don’t smell bad. I heartily recommend touring one if you get a chance.

In Concord the city’s sewage plant is having an open house from 11 a.m. to 1 p.m., to mark World Water Day on Friday, March 22 (details here) I think a lot of plants are inviting visitors on that day – check with your city.

This gives me a chance to rerun my photo of one of the three giant Archimedes screws that Concord WWTF uses to lift sewage into the plant to begin treatment. One of them was open for repairs the day I visited, a couple of years ago. It’s nice to see a technology that is at least 2,500 years old – it probably predates Archimedes, even though he’s credited with inventing it in the third century BC – still being used in modern life.

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