District Installs New England's Second Largest UV Treatment Facilityby
Total Page:16
File Type:pdf, Size:1020Kb
Photo Credit: Kerry Freeman WINTER 2014 Portland Water District ∙ 225 Douglass Street ∙ Portland, Maine 04104-3553 ∙ 207.761.8310 ∙ www.pwd.org Native Plant Water Events What’s Making Climate 3 Spotlight 4Watch 5 2014 6 Waves? 7 Change District Installs New England’s Second Largest UV Treatment Facility By Laurel Jackson If you have driven down Route 35 infrared rays (heat). through Standish recently, you may UV light can also have noticed a huge crane looming be man-made, such as the lamps used over the water treatment plant where in tanning beds. Routes 35 and 237 intersect. Science has proven that UV rays cause Or maybe you have noticed more trucks damage to human coming and going from the entrances skin cells, resulting to the facility. These vehicles and in suntan, sunburn, equipment are being used in a major and sometimes construction project to install ultra- skin cancer, and violet (UV) treatment at the Sebago Lake that is why we Water Treatment Facility. The facility wear sunscreen to treats water from Sebago Lake to make it protect ourselves. safe for drinking, cooking, and bathing In addition to for over 200,000 people in the Greater damaging human A UV reactor is delivered to the Sebago Lake Portland area. Since the facility was built cells, UV light also damages other types Water Treatment Facility in 1993, water from Sebago Lake has been of cells making it useful as a water disinfected using a combination of ozone disinfectant. It works to make water safe why add another type of treatment? The (a form of oxygen) and chloramines (a for drinking by penetrating potentially answer is that ongoing research across chlorine-based compound). In 2014, harmful cells (bacteria, viruses, and other the country identifies new contaminants UV light treatment will be added as an germs) and destroying their DNA. With and treatment must evolve to address the additional form of disinfection. Many its DNA destroyed, it is impossible for a of you are probably familiar with the cell to reproduce which makes it unable to Continued on page 2 terms “ultra-violet” or “UV” from buying infect people and make sunglasses, but how and why is UV light them sick. used in water treatment? So now we know UV light is a form of energy that is similar the “how” of UV to light that humans can see but is invisible disinfection, but what and contains more energy (see Figure 1). about the “why?” If The sun is the major source of UV light the water is already in nature. The energy emitted by the sun being treated and is contains visible light rays, UV rays, and safe for people to use, Figure 1. Emperor Aquatics, Inc. risks they may pose. The Environmental Protection Agency made a new rule in 2006 that requires utilities that use surface water such as a lake, for drinking water to install additional treatment to protect against Cryptosporidium (crypto) infection. UV treatment has proved to be very effective at destroying Cryptosporidium. The new treatment must be installed by April 2014 and the project at the Sebago Lake Treatment Facility is on track to meet that goal. Crypto is a microscopic parasite that can cause serious illness and is found in human and animal fecal UV equipment installed inside the Sebago Lake Water Treatment Facility matter. It can be found in recreational lakes as well as pools and hot tubs that is still a risk that it could be present due to Operators are currently being trained in have not been properly disinfected. people swimming and wildlife using the using the UV system and treatment will Because crypto exists in a durable “cyst” lake. The addition of UV treatment will begin this year. Drinking water from form, it is more resistant to common increase drinking water disinfection to Sebago Lake will continue to be treated disinfection methods such as chlorine a level where a crypto infection is nearly with ozone and chloramines as well, so (see the Water Watch section for more impossible! A benefit of using UV as a it will be disinfected in three different details about Cryptosporidium and the disinfectant is that, because it is not a ways! In fact, along with the addition of illness it can cause). Tests have shown that chemical, it does not change the taste or UV treatment, the ozone system is being UV is effective at destroying crypto cysts. odor of the water. upgraded to a high-efficiency system that Although crypto has not been detected in will save electricity and provide reliable the water we pull from Sebago Lake, there The construction project is nearly ozone treatment into the future. complete and a new treatment chamber Laurel Jackson is a water has been installed that houses a series With the completion of the project, the resources specialist at the of 84 UV bulbs set to the optimum Sebago Lake Treatment Facility will be the Portland Water District. She can be reached at [email protected] wavelength for disinfection. As water second largest UV facility in New England flows past the bulbs, the UV rays will and another barrier of protection will be destroy bacteria, crypto cysts, and other added to safeguard public health. potentially harmful cells. 2 MOSS PHLOX Native Plant Spotlight: (Phlox subulata) Photos: Brie A. Holme Size: Grows to about 6 inches high and spreads to form an attractive groundcover Foliage: Leaves are thin, needle- like, and bright green. Flowers are Soil conditions: Prefers Visit the Sebago Lake typically varying shades of pink well drained soils Ecology Center to see but different varieties can be found examples of this and in purple and white. Light: Full sun other native plants! Bloom time: Early to mid-spring Zones: 3-9 3 WATER WATCH Photos: Mark Hunt, Huntstock.com Cryptosporidium By Nate Whalen The District monitors Sebago Lake for fecal contamination. Cryptosporidiosis is a nasty intestinal illness caused by a tiny parasite called Cryptosporidium – sometimes referred to as “crypto.” It is one of the most common The microscopic organism persists from coming through the tap is to waterborne diseases in America. in the environment for months, or keep it out of the lake to begin with. Cryptosporidiosis is generally even years, inside a protective shell And crypto is only one of many caused by swallowing contaminated (called a cyst) and is transmitted illnesses that can be transmitted water and there are about 9,000 in human and animal fecal matter. through human bodily contact with documented cases in the U.S. Each time a carrier/host defecates, the water. each year. A 1993 outbreak in the millions of these cysts are released Milwaukee public water supply into the environment. The cysts enter Restricting human contact in Lower infected 403,000 people, hospitalized a water body by either washing into Bay is a precautionary measure the 4,400 and killed 100. The Milwaukee the water when it rains or by being Legislature ordered in 1913. The law Water District’s water filtration directly deposited into the water. recognized the importance of source system could not protect people When the cysts are ingested by the protection to reduce contamination. from a contaminated Lake Michigan. next unsuspecting victim, their life Crypto can make anyone very sick cycle continues. Nate Whalen is a water resources and can be deadly to the young, specialist at the Portland Water People often wonder why swimming District. He can be reached at the elderly, and to people with [email protected]. compromised immune systems. is prohibited near the water intake pipes in Lower Bay. This is because the most effective way to keep crypto 4 Sebago Lake Land Reserve: Celebrate Forests, Recreation, and Clean Water By Sarah Plummer Join us on the Sebago Lake Land Reserve in 2014! The 2,500 acre Sebago Lake Land their own equipment, and events are Reserve is a managed forest intended subject to weather conditions. Full moon to protect Sebago Lake, the drinking snowshoe treks are planned for February water supply for Greater Portland. The 14 and March 18, 2014. Cross country Land Reserve, located in Standish and skiing outings are planned for February 15 Gorham, includes 1,700 acres that have and March 15, 2014. been open to the public since 2005 for recreation such as hiking, snowshoeing, Trail Day 2014: May 10 and horseback riding. Its trail network Join us as we celebrate National Drinking connects to well-known trail systems, Water Week during the first week of May! including Sebago to the Sea and the Several water and ecology focused events Mountain Division trails. will be held, including the second annual Trail Day on Saturday, May 10, 2014. Trail Recently, PWD concluded a three-year Day will include free guided events for all project on the Land Reserve trails to ages and interests. Activities will include improve access and usability. Trails adult and family nature hikes, preschool were cleared, defined, and identified nature exploration activities, and faster- using GPS technology, a trail map was paced options like trail running and created, and signs were installed. To mountain biking. celebrate, an inaugural Trail Day was held in September 2013. Approximately Little Lake Stewards Story Time 70 participants enjoyed the trails and Our popular preschool program will run learned about the local ecology. one Friday per month through the spring of 2014. Each two hour session focuses on UPCOMING EVENTS! a nature-related theme which is reinforced Snowshoeing and XC Skiing through books, a craft project, snacks, and on the Land Reserve outdoor exploration on the Land Reserve Full moon snowshoe treks and cross (weather permitting).