What is chlorine used for in water treatment?
After passing through the slow sand filters, as part of our normal drinking water treatment routine, chlorine is used to further treat the drinking water, disinfecting the final product and providing a chlorine residual that maintains the quality water between the water treatment facility and your home.
What is the filtration system at Geren Island?
The slow sand filtration system at Geren Island is one of the largest in the country and has provided effective treatment of Salem's drinking water for more than 80 years. Salem has been able to use this system due to the consistent high quality water we receive from the North Santiam River.
How does ozone treatment work?
The use of ozone treatment offers many benefits: 1 Is capable of managing cyanotoxins and other pathogens. 2 Increases flexibility to handle changes in source water quality. 3 Consistently produces water that is pleasant tasting, year-round. 4 Reduces the amount of chlorine needed for disinfection. 5 Reduces the formation of harmful disinfection byproducts. 6 Complements the existing Geren Island Water Treatment Facility by enhancing the existing biological filtration process. 7 Represents proven technology, with ozone installations increasing in Oregon and across the U.S. due to its ability to provide multiple water quality benefits
Which layer of water purification is responsible for the underlying sand?
Hypogeal biological layer formed on the surface of a slow sand filter. The schmutzdecke is the layer that provides the effective purification in potable water treatment, the underlying sand providing the support for this treatment layer.
What is the bottom layer of a pond called?
The bottom layer, or settled floc , is eventually removed, but the clean water at the top flows off to the next step, which consists of a large pond with a layer of sand called a roughing filter. The roughing filter helps to remove any remaining carbon particles before water is further filtered in Salem's normal slow sand filtration system.
What is slow sand filtration?
Slow sand filtration is one of the oldest and most reliable surface water treatment technologies in the world, and works best when used to treat water from pristine watersheds like the North Santiam River. In slow sand filtration, the good microorganisms form the schmutzdecke to remove the contaminants of concern, including pathogens.
What happens when water passes through a sand filter?
As water passes through slow sand filters, the good bacteria, consisting of harmless bacteria, fungi, protozoa, and other components, remove particles, organic material, and other contaminants. After passing through the Schmutzdecke, the water infiltrates through the supporting sand layer.
Lake John Hay Water Treatment Plant
The John Hay facility was built in 1968 to increase Salem's water supply. It is rated at 3 million gallons per day. This plant is rated as a 210-Acre supply lake and typically pumps 2 to 2.4 million gallons per day.
Lake Salinda Water Treatment Plant
The Lake Salinda facility was built in 1947. It was remodeled in 1979 to increase capacity and to take advantage of improved water treatment processes. Lake Salinda is still used as a supplemental supply for Salem. It has an 88 acre surface supply lake and the plant is rated at 1 million gallons a day.
Contact City of Salem Water Works
Russell Brown - Water Distribution Superintendent and Water Treatment Superintendent#N#[email protected]
