CASE STUDIES AND WHITE PAPERS

Saving Silicon Valley: How A Reuse Project Became Its Own Tech Breakthrough
Saving Silicon Valley: How A Reuse Project Became Its Own Tech Breakthrough

The Silicon Valley Advanced Water Purification Center project provides expanded reuse opportunities, increased sustainability, and promise for the future.

  • Thinking About Volatile Organic Compounds (VOCs) In Drinking Water
    Thinking About Volatile Organic Compounds (VOCs) In Drinking Water

    Volatile organic compounds (VOCs) are a large group of carbon‐based chemical compounds that evaporate easily at room temperature. Certain VOCs are federally regulated substances in drinking water.

  • Theoretical Operation Of High-Efficiency Ultraviolet Water Treatment Chamber
    Theoretical Operation Of High-Efficiency Ultraviolet Water Treatment Chamber

    The NeoTech Aqua ReFleX™ water purification chambers are the most efficient and compact units available today. They require an order of magnitude less energy and less than 25% of the system volume to achieve the same or better purification result as competing chambers. This is the first in a series of three white papers explaining the benefits of these systems. By J. R. Cooper, Ph.D, NeoTech Aqua Solutions, Inc.

  • TotalCare Condition Audit Results In Energy Savings Of 80% And Improved Controls
    TotalCare Condition Audit Results In Energy Savings Of 80% And Improved Controls

    Xylem TotalCare Condition Audit, an inspection and recommendation program that helps plant operators find ways to lower maintenance costs by identifying inefficiencies in the operation of water and wastewater equipment, was elected to audit the American Canyon Wastewater Treatment Plant (WWTP) in California.

  • Thinking About Chromium In Drinking Water
    Thinking About Chromium In Drinking Water

    Chromium is a naturally occurring metal common in the earth’s crust. There are multiple forms of chromium, and one form, called chromium‐3, is actually a required nutrient for human health, in the right amount.

  • Clari-DAF Pretreatment System Reduces Chemical Consumption, Doubles Treatment Capacity
    Clari-DAF Pretreatment System Reduces Chemical Consumption, Doubles Treatment Capacity

    Together, two water treatment plants in Boulder, CO, have the capacity to treat 55 million gallons per day (MGD). When severe drought conditions restricted the source water supply of the Betasso WTP, the city decided to expand the capacity of the Boulder Reservoir Water Treatment Plant (WTP).

  • UVC LEDs For Biofilm Prevention
    UVC LEDs For Biofilm Prevention

    Biofilm has adverse effects on all types of instruments, sensors, and equipment used in power plants, food and beverage production plants, desalination facilities, paper mills, and marine environments. This includes growth on pipelines, tanks, heat exchangers, reverse osmosis (RO) membranes, and other equipment. Biofilms can cause reduction of heat transfer, increased pressure drop and corrosion of metallic surfaces, and many forms of contamination. 

  • Bring On The Bacteria: Conventional Treatment Methods Not Enough To Produce Safe Drinking Water
    Bring On The Bacteria: Conventional Treatment Methods Not Enough To Produce Safe Drinking Water

    Around the world there are guidelines and regulations regarding the quality of drinking water distributed by water treatment plants. These guidelines/regulations are sometimes national, such as U.S. regulations and Canadian guidelines.

  • Arsenic Removal Technologies:  A Review
    Arsenic Removal Technologies: A Review

    Arsenic is a common element in the earth’s crust, natural groundwater, and even the human body.  It is an odorless and tasteless semi-metal (metalloid) that is naturally present in aquifers throughout the U.S. and the world. 

  • Biological Drinking Water Treatment: Microbiological Considerations For The Operation And Control Of Biofilters
    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.

  • Disinfection Performance Testing Of High-Efficiency Ultraviolet Water Treatment Chamber
    Disinfection Performance Testing Of High-Efficiency Ultraviolet Water Treatment Chamber

    This is the second in a series of three white papers describing the design and performance of the NeoTech Aqua ReFlex™ treatment chamber. The first describes in detail the theoretical basis for the very high efficiency demonstrated by the chamber. The third paper describes how this chamber design leads to some highly desirable operational advantages beyond just energy ad cost reduction. By J. R. Cooper, Ph. D. and Gwynne Cavender, NeoTech Aqua Solutions, Inc.

  • Treatment of Groundwater Contaminated With 1,4-Dioxane - Tucson, Arizona (Case Study)
    Treatment of Groundwater Contaminated With 1,4-Dioxane - Tucson, Arizona (Case Study)

    The TrojanUVPhox™ installation at Tucson's Advanced Oxidation Process Water Treatment Facility treats 1,4-dioxane and produces water that is blended and then treated at the neighboring Tucson Airport Remediation Project facility. This purified water is supplied to nearly 50,000 end users.

  • Dissolved Air Flotation Technology Nearly Doubles Treatment Capacity
    Dissolved Air Flotation Technology Nearly Doubles Treatment Capacity

    Faced with a tight capital budget, a city in British Columbia required a new design for a water treatment plant capable of a maximum daily water production of 21 MPG during peak demand periods, with an ultimate demand of 29 MGD.

Membrane Treatment Of Groundwater
Membrane Treatment Of Groundwater

The groundwater that a southern Louisiana water utility supplies to local residents has traditionally carried a high amount of organic material and color. In the past, the organics were oxidized and broken down by chlorination, but this practice had gone out of favor due to production of disinfection by-products (DBPs) such as Trihalomethanes (THMs) and Haloacidic Acids (HAAs).

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CONTAMINANT REMOVAL PRODUCTS

Xylem’s Leopold Oxelia™ for Drinking Water Applications Xylem’s Leopold Oxelia™ for Drinking Water Applications

Biological and chemical contamination in drinking water poses a significant public health risk and plant operators require a treatment system that allows them to produce a safe and reliable supply of clear, good-tasting and biologically-stable finished water with the lowest concentrations of non-desired substances.

ClorTec® Aftermarket Solutions And Services ClorTec® Aftermarket Solutions And Services

De Nora Water Technologies can help you to optimise your electrochlorination system operation to deliver consistent life long performance.

SORB 33® Arsenic Removal System SORB 33® Arsenic Removal System

The SORB 33® arsenic removal system from De Nora Water Technologies is economical, simple to operate and requires virtually no labor. In this simple pump-and-treat adsorption system, the contaminated water passes through a robust granular ferric oxide media, Bayoxide® E33. As water passes through the media, arsenic is adsorbed and removed to a level below the 5 micrograms per liter (μg/l). The SORB 33 system requires no cleaning, no regeneration and no complex, laborintensive steps.

NeoTech D228™ NeoTech D228™

The NeoTech D228™ is specially designed to disinfect water and is an essential component in advanced oxidation processes.

ClorTec® On-Site Sodium Hypochlorite Generation Systems CT Series ClorTec® On-Site Sodium Hypochlorite Generation Systems CT Series

ClorTec CT systems easily control sodium hypochlorite production and provide a powerful disinfection method for any application. CT systems meet requirements for 75–300 lb/day (34–136 kg/day) chlorine equivalent. Applications include potable water, wastewater, odor and corrosion control, cooling towers, oxidation and swimming pool disinfection.

MicroDPD® On-Line Colorimeter Chlorine Analyzer MicroDPD® On-Line Colorimeter Chlorine Analyzer

The MicroDPD® analyzer uses proven DPD colorimetric technology for monitoring chlorine in both municipal and industrial applications. The instrument can measure free or total chlorine in drinking water, wastewater and seawater.

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DRINKING WATER CONTAMINANT REMOVAL PODCASTS

UV Disinfection With LEDs UV Disinfection With LEDs

UV LEDs offer the chemical free disinfection of traditional UV while avoiding mercury lamps. In certain applications where customers are concerned about the potential hazards of mercury contamination in the water from a broken lamp, UV LEDs are interesting because they don’t contain any mercury content at all.

A 'Banner Year' For Ballasted Treatment A 'Banner Year' For Ballasted Treatment

It may not be mentioned as Ryan Seacrest begins the countdown on New Year’s Eve, but a few treatment plants scattered across the country may recall 2015 as the year of ballasted treatment.

Will Peracetic Acid Replace Chlorine? Will Peracetic Acid Replace Chlorine?

Chlorine has long been a water treatment staple, but it’s not without its complications. As an alternative, some treatment facilities have been turning to peracetic acid (PAA) and enjoying several key advantages.

Let’s Talk Adenovirus With TrojanUV (Audio) Let’s Talk Adenovirus With TrojanUV (Audio)

Adam Festger, Drinking Water & Environmental Contaminant Treatment market manager for TrojanUV, sat down with Water Online Radio to discuss UV trends and technologies. Hear all about TrojanUV’s “Let’s Talk Adenovirus” campaign, as well as the company’s growing installation base and recent product developments.

The Evolution Of Low-Energy UV Disinfection The Evolution Of Low-Energy UV Disinfection

Conventional ultraviolet (UV) disinfection is a great, but often expensive, solution for the destruction of pathogens in drinking water. All those lamps and power emissions add up. But what if you could perform the same job with 1/10 of the power used by conventional systems?

UV-LED Technology: The Latest In Disinfection UV-LED Technology: The Latest In Disinfection

Dan Shaver, Business Development Manager at Aquionics, talks about the advantages of UV-LED technology for disinfection: low energy requirements, chemical-free and customizable design, and proficiency in solar or battery-powered applications.

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CONTAMINANT REMOVAL VIDEOS

TrojanUVTorrent™ Drinking Water UV Disinfection System (Video) TrojanUVTorrent™ Drinking Water UV Disinfection System (Video)

The TrojanUVTorrent™ is the solution for large-scale drinking water facilities in need of revolutionary UV disinfection technology.

Meet The Worlds Most Advanced Ozone Generator Technology Meet The Worlds Most Advanced Ozone Generator Technology

Ozone is one of the strongest and most powerful oxidants available. As an oxidant, ozone is approximately 50% more powerful than chlorine.

biottta Biotreatment Pilot Case Study biottta Biotreatment Pilot Case Study

The Lincoln Pipestone Rural Water District in Minnesota had a high level of both nitrate and manganese in the groundwater. Piloting of the biottta treatment solution proved to be successful.

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ABOUT

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).