Southern Delivery System (SDS) Water Treatment Plant, Colorado, United States of America
Colorado Springs Utilities constructed a new water treatment plant in El Paso County, Colorado, US, as part of the larger $1.45bn Southern Delivery System (SDS) water project. The project broke ground in March 2013 and construction was completed in April 2016.
The new facility, which is the biggest component in the SDS project, has a daily treatment capacity of 50 million gallons of water. The plant's capacity can be increased to treat up to 130 million gallons of water a day to meet future customer demand.
Up to 30 companies were involved in the construction of the water treatment plant. The main contractors include McCarthy Building Companies, MWH and Carollo Engineers.
The engineering and re-design of the facility by the project team has enabled them to reduce the estimated overall plant construction cost by approximately 30%. The total investment for the project is $825m, which is $160m under budget.
Southern Delivery System water project
The SDS project is being executed in two phases. Construction of phase one started in 2010 and was completed in April 2016. The project supplies the Arkansas River water stored in Pueblo Reservoir to Colorado Springs, Fountain, Security and Pueblo West.
Significant components of phase one include the Pueblo dam connection, which was completed in 2012, Juniper pump station in Pueblo County, Williams Creek pump station in El Paso County, Bradley pump station in El Paso County, the current water treatment plant and a treated water pump station, including pipelines to carry water into the distribution system.
Aiming to supply 100 million gallons of water a day, phase two will include construction of the Upper Williams Creek reservoir and Lower Williams Creek reservoir, as well as expansion of the water treatment plant and pump stations. At full capacity, SDS will transport up to 96 million gallons of water a day. Up to 78 million gallons of water a day will be supplied to Colorado Springs, Security and Fountain, while the remaining 18 million gallons of water a day will be supplied to Pueblo West.
SDS water treatment plant
The water treatment plant was built on an area of 82,000ft². The facility itself is spread across 100 acres (40.4ha), and incorporates a storage tank with a capacity to store ten million gallons of untreated water, an additional tank to store seven million gallons of treated water, and a finished water pump station.
The three pump stations lift the water to a height of 1,500ft from Pueblo Reservoir and supply it to the water treatment plant. The large untreated water pipelines have a 66in-diameter and connecting the Pueblo Reservoir and the water treatment facility are divided into northern and southern sections.
Measuring approximately 29 miles (46.6km) in length, the south pipeline carries water from the Juniper pump station to the Williams Creek pump station. The north pipeline, measuring approximately 18 miles (29km) in length, further supply untreated water from Williams Creek pump station to Bradley pump station, where the water is carried to the SDS water treatment plant.
The treated water is conveyed to a water distribution system through a finished water pump station and a finished water pipeline. A finished water pipeline measuring around 42in-54in in diameter and five miles (8km) in length is being installed at El Paso County.
Treatment technology at the Colorado plant
The advanced water treatment facility uses ozone / biological filtration method to treat water supplied from Pueblo Reservoir. This method removes contaminants in three stages.
The first stage of treatment involves adding ozone to remove coagulated solids that float on the water surface. The second stage involves biological treatment using activated carbon filters to remove ammonia and manganese. The final stage involves disinfection using chlorine.