>60% reduction in TTHMs achieved.
Topics: trihalomethane reduction, spray aeration
System Overview: This municipality purchases water from a neighboring community.
Disinfectant Type: Chlorine
Tank / Reservoir Build Information:
- Name: East Tank
- Volume: 750,000 gallons
- Construction: welded steel
- Height: 45 feet.
- Diameter: 60 feet Type: ground storage
- Daily Inflow: 150,000 gallons
- Max. Fill Rate: 175 gpm
Pre-Deployment Conditions: Excessive trihalomethane (THM) concentrations were creating compliance issues. Other issues included: thermal stratification, uneven water age, and accumulating tank ice during winter months.
Project Objectives: Total trihalomethane (TTHM) reduction.
Solution: One (1) GridBee® SN Series Small Frame Spray Aeration Unit with blower ventilation and one (1) GridBee® GS Series Potable Tank Mixer deployed in August 2012.
Results: Water quality improved significantly. Certified laboratory tests have documented a 62% reduction in total THMs. No thermal stratification or ice related issues have since been reported.
Update: Positive results in the East Tank have led to the purchase of an additional GridBee® GS Series Potable Tank Mixer for their West Tank.