WASTEWATERBy Rick LallishDuckweed can be a nuisance and cause problems in facultative lagoons. What is the recommended method of controlling duckweed outbreaks?A. Apply large amounts of HY-var to the influent flowB.Add live Daphnia to the lagoonC. Physical removalD. Allow the duckweed to flourish, as it will assist the algae with dissolved oxygenAnswer: C. Some treatment facilities actually use duckweed to control excessive algae growth. However, duckweed is an extremely aggressive plant and can overtake a facultative lagoon cell in a very short time. The most recommended method of controlling duckweed is to physically remove it. This can be done by using a boat
