WATER WISE: Technology will enhance recycled water quality
Richard Santos
San Jose Mercury News
11/10/2010
It will also preserve Silicon Valley water supplies
In October, the Santa Clara Valley Water District and the San Jose/Santa Clara Water Pollution Control Plant broke ground on a new water treatment facility that will produce up to 10 million gallons of highly purified water per day. The Advanced Water Treatment facility is designed to enhance the quality of recycled water used in San Jose, Santa Clara and Milpitas.
The water produced in this facility will help us meet Silicon Valley's future water demands. The facility has been designed so that it can be expanded in the future to four times its size. As we face significant challenges with our imported water supplies and potential impacts from global climate change, this local water source could be a major part of our future water supply portfolio.
The technology is impressive. Water that has undergone two levels of treatment at the adjacent wastewater treatment plant will undergo three additional advanced treatment stages: microfiltration, reverse osmosis and ultra-violet disinfection. This facility will be able to produce water that's as pure as or purer than most potable water sources.
The water that is produced will then be blended with recycled water produced for the South Bay Water Recycling program, which has been providing recycled water to San Jose, Milpitas and Santa Clara customers for more than 10 years. The enhanced blend of water will help industrial users reduce operating costs, and it can be used on a wider variety of landscapes, due to a much lower level of salinity. As a result, it is expected that more customers will tap into the recycled water system.
This will be the largest public facility of its kind in Northern California. The same technology is being used worldwide to produce highly purified water for drinking. Orange County is using the same technology to replenish groundwater. That project has been running successfully since 2008.
The Santa Clara Valley Water District will own and operate the new treatment facility while the city of San Jose will continue to operate the South Bay Water Recycling program, which distributes recycled water to more than 600 industrial, agricultural and landscape users.
In the works since 2006, the construction of the facility was kick-started by the success of California's congressional delegation to secure a share of federal stimulus funds. Congresswoman Zoe Lofgren, who spoke at the groundbreaking, was instrumental in securing $8.25 million from the American Recovery and Reinvestment Act of 2009 for the project. About 800 people will be put to work during the two years of construction.
