DRINKING WATER CONTAMINANT REMOVAL
CASE STUDIES AND WHITE PAPERS
California recently became the first U.S. state to regulate hexavalent chromium in drinking water. Will others follow suit?
Closed Vessel UV Successful In El Paso County, TX
Horizon City is located in El Paso County, the most western county in Texas. The city is home to a rapidly growing population of 19,000 people, up from 5,000 during the 2000 Census. The City takes its name from the real estate development company, the Horizon City Corporation. With less than 9 inches of annual rainfall, water conservancy is a routine way of life in this part of the State.
Using Ozone To Remove Micropollutants From Wastewater
Micropollutants in our wastewater are a growing problem and so is the concern for the long-term hazard to the ecosystem.
Key Considerations For Biological Drinking Water Treatment
Interested in converting to biological drinking water treatment? Here’s what you need to know.
Biological Drinking Water Treatment: Microbiological Considerations For The Operation And Control Of Biofilters
It’s well known the beneficial role that particular groups of microorganisms have in the food and beverage industry. Similarly are the beneficial aspects that either engineered or non-engineered biological treatment systems have in the drinking water production process.
Known For “Healing Waters,” Pagosa Springs Restores Its Potable Water System With Help From SolarBee® Mixers
Located in the high desert plateau of southwestern Colorado, Pagosa Springs is famous for its geothermal hot springs, which draw visitors worldwide to soak in the mineral-rich water. The Utes called the sulfur springs “Pah-gosah,” meaning “healing waters.” You might say the town’s potable water system is healed now as well.
The UV Uprising: How UV Disinfection Will Claw Its Way To Prominence
Chlorination in all of its forms — gas, liquid, or solid — has been the primary way for treatment plants to disinfect the treated wastewater. The treatment plants that use gas chlorination must face federal regulatory oversight in the form of a Risk Management Program (RMP). Liquid chlorine plants trade in the regulatory oversight for a more expensive and less effective product. While chlorine in its solid form is good for small treatment facilities known as package plants (named for their mobility). However, ultraviolet (UV) technology is rapidly altering the landscape of disinfection throughout the industry.
4-Log Virus Inactivation - Abington, Pennsylvania (Case Study)
The Hall Road Well Station — located in Abington, Pennsylvania — is designed to extract and treat 1.5 million gallons per day (MGD) of water from the Piedmont and Blue Ridge crystalline-rock aquifers. It is part of a network of groundwater extraction wells owned and operated by Aqua-America Pennsylvania (Aqua PA). Aqua PA determined that UV technology was the best approach for meeting the Pennsylvania Department of Environmental Protection regulations for 4-log virus treatment of groundwater. This case study will show you why they chose the TrojanUVSwift™SC.
Ion Exchange: A Viable Water Treatment Alternative To Membranes
Five decades ago, ion exchange using charged resins was one of two processes used in the water industry for water treatment.
MIOX Achieves Increased Efficacy Against Biofilm And Legionella Vs. Common Biocides
Comparative disinfection studies using 3 oxidizing biocides and 3 commonly used non-oxidizing biocides against Legionella pneumophilia.
Biological Drinking Water Treatment: Challenges And Potential
The continuous struggle to remediate contaminated natural waters, and to reduce the impact of emerging challenges on the supply of safe potable water are key drivers for research and development in the global water industry today.
The Role Of UV In Solving Next-Generation Water Challenges
The global market for water treatment technologies is growing and becoming increasingly important as the quality and quantity of freshwater sources are stressed and the link between fresh water sources and wastewater — returned to the environment — is more and more obvious. By Rick VanSant, President & CEO, UV Pure Technologies, Inc.
Surface Water Treatment & LT2 Compliance - Surprise, Arizona (Case Study)
The White Tanks Regional Water Treatment Facility (White Tanks) is located in Surprise, Arizona, and treats surface water from the Colorado River that is delivered by a 336 mile (540 kilometer) man-made canal.
The City of Berea public water system, provides service to approximately 20,000 people, using surface water drawn from the East Branch of the Rocky River; however, supplies can also be drawn from nearby Coe Lake and Baldwin Creek as needed.
CONTAMINANT REMOVAL PRODUCTSMore Products
DRINKING WATER CONTAMINANT REMOVAL PODCASTSMore Podcasts
CONTAMINANT REMOVAL APPLICATION NOTES
CONTAMINANT REMOVAL VIDEOSMore Videos
The removal of contaminants from public drinking water systems in the US is mandated by the Environmental Protection Agency’s (EPA) National Primary Drinking Water Regulations. These are legally enforceable standards that protect public health by limiting the levels of contaminants in drinking water. Similar regulations are managed by agencies worldwide to protect their citizens from drinking water contamination.
There are a plethora of drinking water contaminant removal technologies that public and private water systems use to comply with the EPA’s drinking water regulations. These include reverse osmosis, membrane, nanofiltration, ultrafiltration, chlorine disinfection, UV disinfection and Ozone-based disinfection practices.
The EPA’s list of drinking water contaminants is organized into six types of contaminants and lists each contaminant along with its Maximum Contaminant Level (MCL), some of the potential health effects from long-term exposure above the MCL and the probable source of the drinking water contaminant.
The six types of contaminants are microorganisms, disinfectants, disinfection byproducts, inorganic chemicals, organic chemicals and radionuclides.
Examples of microbiological, organic contaminants are Cryptosporidium and Giardia lamblia. Both of these microorganic pathogens are found in human or animal fecal waste and cause gastrointestinal illness, such as diarrhea and vomiting.
A common disinfectant used in municipal drinking water treatment to disinfect microorganisms is chlorine. The EPA’s primary drinking water regulations require drinking water treatment plants to maintain a maximum disinfectant residual level (MDRL) for chlorine of 4.0 milligrams per liter (mg/L). Some of the detrimental health effects of chlorine above the MCL are eye irritation and stomach discomfort.
Similarly, byproducts from the chlorine-based disinfection methods used by public water systems to remove contaminants can be contaminants in their own right if not removed from the drinking water prior to it being released into the distribution system. Examples of disinfection byproducts include bromate, chlorite and total trihalomethanes (TTHMs). Not removed from drinking water, these disinfection byproducts can increase risk of cancer and cause central nervous system issues.
Chemical contamination of drinking water can be caused by inorganic chemicals such as arsenic, barium lead, mercury and cadmium or organic chemicals such as benzene, dichloroethane and other carbon-derived compounds. These chemicals get into source water through a variety of natural and industrial processes. Arsenic for example is present in source water through the erosion of natural deposits. Many of the chemical contaminants are derived from industrial wastewater such as discharges from petroleum refineries, steel or pulp mills or the corrosion of asbestos cement water mains or galvanized pipes.
Radium and uranium are examples of radionuclides. Radium 226 and Radium 228 must be removed to a level of 5 picocuries/liter (PCI/L) and Uranium to a level of 30 micrograms/liter (30 ug/L).