Down to a Science’s first field trip was a resounding (and smelly) success.
Courtesy Tony, here’s a brief recap:
I took a tour of one of SF’s 2 water treatment plants this morning. This one only deals with 15% of the sewage while the other one handles the rest. When sewage first enters the plant, the large inorganic debris are removed before anaerobic bacteria are added to the sewage in a large egg-shaped tank. Then the sewage is passed through an enormous tank that uses gravity to separate the heavy solid …