As in our recent post on Billerica, MA, we will continue form time to time to point out drinking water treatment systems that use ozone. The Portland Water District of Maine is one such organization.
Sebago Lake is the deepest and second largest lake in the U.S. state of Maine and is the primary water supply for the Portland Water District, which serves the Greater Portland region and about 15% of Maine’s population. Water inflow is estimated at 544 million gallons per day and outflow at 498 million gallons per day, of which 24 million gallons/day are for the water district.
The lake water is treated with ozone as the primary disinfectant to kill bacteria and parasites, such as giardia, which can cause diarrhea. As with all ozone applications, the water district generates the ozone on site using ozone generators.
Water additives are also included in the water for corrosion control, along with a secondary disinfectant, chloramine, to help keep the pH level of the water at 8. The remaining water moves onto the hypochlorite, or bleach system, which is used as another disinfectant.
Spartan Environmental Technologies supplies ozone generators for drinking water treatment.