The Challenge: Address Episodic Taste and Odor Events
The primary objective of this project was to reduce algae concentrations with secondary objectives to reduce the concentration of taste and odor causing compounds in the reservoir water and also to increase the efficiency of the plant by decreasing chemical doses and increasing filter run times.
The Solution: Monitor, Predict and Control Algal Blooms
As an alternative to copper-based algaecides, the use of ultrasonic treatment can be used to control algae. Ultrasonic treatment uses high frequency sound waves to attack the algal cells. The treatment is widely used in commercial and residential applications but is relatively new for municipal raw water reservoirs.
The Results: Reduction of Chemical Consumption, Odor and Taste Problems
Extensive testing conducted during 2014 showed that the buoys had a significant impact on the algae, reducing algal counts, raw water turbidity and total organic carbon in the water. This improved water quality, enabled the plant operations staff to reduce coagulant consumption by more than 20 percent and reduced the concentration of undesirable T&O-causing compounds in the raw water entering the plant.
“Extensive testing conducted during 2014 showed that the buoys had a signiﬁcant impact on the algae, allowing the plant to reduce chemical consumption by more than 20 percent, and reducing the concentration of undesirable taste and odor causing compounds in the treated water delivered to customers”.