Every kid wants a pet fish in the bedroom — until it’s time to scrub off the algae that grows on the tank where sunlight meets the nutrient-rich water.
A 120-foot-diameter clarifier at the Rochester (Minnesota) Water Reclamation Plant had a similar (though much larger) problem of its own, in the launder and weir area of a final clarifier.Since the facility’s construction, the fifth and final clarifier had algae cultivation issues, and not for lack of effort and maintenance. “We were cleaning the weir on a weekly basis, and it took multiple people about half a day or more each time,”
