The city Flint’s Drinking Water Treatment Plant is rated to treat 36 million gallons of water a day. The city of Flint’s average daily usage is about 11 million gallons a day. The plant was built in 1956. The old plant, which was built in 1917, is still standing on site. The plant has received various upgrades to the tune of about $50 million from 1998-2006.
The plant employs ozone generators to produce ozone as a primary disinfectant and to oxidize other compounds in the water. The ozone is introduced via fine bubble diffusers in the contact tank which is a common method of ozone water mixing. Ozone is used to treat drinking water around the world and the water from the City of Detroit also uses ozone.
Flint is evaluating options for future drinking water resources. The plant is looking at treating water from the Flint River and mixing it with water from Detroit. At present, they are running tests. After a test run at the plant, the treated Flint River water is dumped back right into the river. If the this approach is adopted city can easily use the water by opening a valve to the distribution system and send the treated water to residents and businesses in the city.
A major upgrade to the Sebago Lake Water Treatment Facility has been started for the Portland Water District’s treatment facility in Standish at a cost of a $12.8 million. It adds two UV reactors as well as an upgraded ozone water treatment system. The Water District has been designing this system since 2002.
Engineers with the water district say not only is this upgrade more energy efficient but also safer for it’s roughly two hundred thousand customers. The seventeen month project could raise residential monthly bills by about $1.60. But the water district hopes to offset much of that by retiring debt. Efficiency Maine also awarded the water district a three hundred thousand dollar grant.
Many US drinking water treatment facilities are upgrading their plants to take advantage of new technologies such as ozone and UV to meet new EPA regulations for surface water treatment.
NSF International water quality and treatment experts will be presenting at the World Aquatic Health Conference October 11 in Norfolk, Va., according to a press release. Their presentations will cover the regulatory and testing considerations for evaluating the efficacy of ultraviolet (UV) and ozone water treatment technologies to help ensure the health and safety of pool and spa environments.
NSF International has helped UV and ozone water treatment technologies gain acceptance for drinking water and recreational water treatment applications by testing and certifying products against a NSF American National Standard, which covers both UV and ozone. Topics include: Understanding, Testing and Certification of UV Systems for Recreational and Drinking Water and Evaluating the Efficacy of Ozone Treatment Systems Against Protozoa, Bacteria and Viruses.
NSF has published NSF Standard 222 which specifically addresses the use of small to medium sized ozone generators for municipal drinking water applications. NSF laboratories also use an ozone UV process from Spartan Environmental Technologies to recycle water used in testing of water treatment equipment in their laboratories. The recycling of this water helped NSF’s facility to achieve higher LEEDS certification.