Ultraviolet Drinking Water Articles on Environmental XPRT

Inactivation of Cryptosporidium parvum by Medium-Pressure Ultraviolet Light in Finished Drinking Water

Untitled Document The inactivation of Cryptosporidium parvum in finished drinking water by medium-pressure UV light ...

Jan. 1, 1998

Inactivation of Cryptosporidium parvum by Medium-Pressure Ultraviolet Light in Finished Drinking Water

The inactivation of Cryptosporidium parvum in finished drinking water by medium-pressure UV light (200-300 nm) has been investigated at both the bench scale, using a collimated beam apparatus, and at the demonstration scale, using a Calgon Carbon Corporation Sentinel™ system at the Mannheim Water Treatment Plant, Kitchener, ON, Canada. The viability of the oocysts was assessed using both in vitro ...

Nov. 1, 1989

By Calgon Carbon Corporation UV Technologies Division

Is Ultraviolet Ultra Safe?

With retailers under pressure to meet increasing health and safety standards, it’s no surprise that many of our food & products are coming into contact with Ultraviolet (UV) radiation which is gradually becoming common as a cost effective method of reducing or eliminating pathogens Ultraviolet wavelengths are classified into three general areas: UV-A, UV-B and UV-C. These can be used in ...

Jan. 7, 2015

By Alpha-Cure Ltd

Ultraviolet Light Oxidation of Free-Chlorine in Water

Chlorine is the most frequently used chemical for water disinfection. Many industrial and commercial manufacturing facilities cannot tolerate the introduction of chlorine into the process because of contamination and unwanted chemical reactions. Chlorine affects the flavour and odour of drinks and fluids, accelerates corrosion on process vessels and piping, and can also damage delicate process ...

Jun. 21, 2007

By Hanovia Ltd - a Halma Company

Unique Ozone and Ultraviolet Water Treatment System

Euroby Ltd, the sludge treatment specialists, are pleased to announce the signing of an agreement to be the sole UK and Ireland distributor for the unique UVOX range of water treatment systems.UVOX, as the name suggests, uses a combination of Ultraviolet and Ozone to treat infected and polluted water.Its uniqueness stems from its novel method of first producing ozone by irradiating air with a ...

Mar. 1, 2008

By Euroby Limited

Illuminating Ultraviolet Disinfection for High-Level Reuse in Florida

Chlorine has been the mainstay of the wastewater disinfection industry for more than 100 years due to its effectiveness, low cost and availability. However, due to various problems associated with chlorine, the Hillsborough County, Florida Water Resource Services Department decided to replace the high-level reuse water chlorine gas disinfection system at the Valrico Advanced Wastewater Treatment ...

Oct. 21, 2006

By Water Environment Federation (WEF)

New DWI guidelines for UV drinking water disinfection

atg UV, has seen increasing interest in the application of UV systems for the treatment of drinking water applications since the UK Drinking Water Inspectorate (DWI) released their ‘Guidance on the use of Ultraviolet (UV) Irradiation for the Disinfection of Public Water Supplies' February 2010. With systems treating in excess of 2000 m3/hr daily, Ultraviolet disinfection is no longer an ...

Feb. 1, 2011

By atg UV Technology

Application of chemical oxygen demand to drinking water

“This study investigated the use of a photoelectrochemical chemical oxygen demand (peCOD) analyzer for the detection of model organic compounds and natural organic matter (NOM) from four drinking water treatment plants in Nova Scotia, Canada. Most model organic compounds showed ...

May 18, 2015

By Camlab Limited

Monitoring of three drinking water treatment plants using flow cytometry

A 4-month sampling campaign has been conducted for the monitoring of three drinking water treatment plants using flow cytometry and culture-based methods to provide information related to changes in bacterial concentration according to treatments. Flow cytometry is a fast and user-friendly technique enabling bacteria quantification and viability assessment in less than 1 hour. Specific profiles ...

Oct. 16, 2014

By IWA Publishing

The effect of chlorine and combined chlorine/UV treatment on coliphages in drinking water disinfection

Chlorine disinfection is a globally used method to ensure the safety of drinking water. However, it has not always been successful against viruses and, therefore, it is important to find new methods to disinfect water. Seventeen different coliphages were isolated from the treated municipal wastewater. These coliphages and MS2 were treated with different dosages of chlorine in drinking water, ...

Apr. 6, 2016

By IWA Publishing

Fluorescent-conjugated MS2 as surrogates for viruses during drinking water treatment

Microfiltration/ultrafiltration (MF/UF) membranes and ultraviolet (UV) light disinfection serve as attractive alternative technologies to aid utilities in complying with both the LT2ESWTR and Stage 2 D/DBP. However, both technologies are limited in their ability to remove viruses and at the same time there is a lack of methods to accurately demonstrate virus removal in full-scale settings. In ...

Dec. 15, 2014

By IWA Publishing

Evaluating a composite cartridge for small system drinking water treatment

A pilot-scale evaluation was conducted at the U.S Environmental Protection Agency (EPA) Test & Evaluation (T&E) Facility in Cincinnati, Ohio, on a multi-layer, cartridge-based system that combines physical filtration with carbon adsorption and ultraviolet (UV) light disinfection to serve as a home-base water treatment security device against accidental or intentional contaminant events. The ...

Mar. 1, 2010

By IWA Publishing

The evolution of organic character in a drought- and flood-impacted water source and the relationship with drinking water treatment

A pilot-scale research investigation examining treatment technologies including coagulation, ion-exchange, activated carbon and membrane filtration and their impact on water quality coincided with a period of extensive variability in source water character. Distinct water quality periods as a result of extreme climatic conditions from drought to flood were observed and the natural organic ...

Dec. 29, 2014

By IWA Publishing

Supply system factors associated with microbiological drinking water safety in regional New South Wales, Australia, 2001–2007

Aim: To determine factors associated with microbiological safety of public drinking water systems in regional New South Wales (NSW), Australia. Method: We analysed 107,000 end-user drinking water samples for an association between detection of Escherichia coli and drinking water system features, sample year and season using NSW Health Drinking Water Monitoring Program data, 2001–2007. We used ...

Mar. 1, 2010

By IWA Publishing

Method to determine the power efficiency of UV disinfection plants and its application to low pressure plants for drinking water

In this paper we present a method to determine the power efficiency of ultraviolet (UV) disinfection plants and apply this to low pressure plants for drinking water. In UV disinfection plants the water flow is regulated to ensure that microorganisms receive the necessary fluence for inactivation while passing through. The flow depends on the UV transmission (UVT) of the water. The lower the ...

Dec. 5, 2016

By IWA Publishing

Effect of granular activated carbon type and age on quenching H2O2 residuals after UV/H2O2 drinking water treatment

Granular activated carbon (GAC) can be used to quench residual hydrogen peroxide (H2O2) after ultraviolet (UV)-H2O2 advanced oxidation processes in drinking water treatment. Bench- and pilot-scale studies examined the possible loss of GAC reactivity due to continuous exposure to natural water from a water treatment plant in both the presence and absence of ...

Oct. 19, 2015

By IWA Publishing

Aging evaluation of medium-pressure mercury lamps under typical operating conditions for drinking water disinfection applications

Little is known regarding how medium pressure (MP) ultraviolet (UV) lamps age under typical operating conditions, yet a number of assumptions regarding lamp aging are utilized when UV reactors are validated, often as unfounded approximations. This study was designed to evaluate the aging of MP UV lamps utilized with a closed-vessel UV reactor technology for drinking water disinfection ...

Jan. 1, 2007

By Degremont Technologies - a subsidiary of Suez Environnement

Virus contamination from operation and maintenance events in small drinking water distribution systems

We tested the association of common events in drinking water distribution systems with contamination of household tap water with human enteric viruses. Viruses were enumerated by qPCR in the tap water of 14 municipal systems that use non-disinfected groundwater. Ultraviolet disinfection was installed at all active wellheads to reduce virus contributions from groundwater to the distribution ...

Dec. 1, 2011

By IWA Publishing

Evaluation of approaches for consumers to eliminate chlorine off-flavors from drinking water at point-of-use

Chlorine off-flavors of tap water have caused dissatisfaction and distrust from some consumers, placing pressure on operators concerning water disinfection. Evaluating practical approaches for eliminating chlorinous off-flavors by consumers at point-of-use while avoiding production of toxic byproducts is a practical concern. Three recognized dechlorination methods: ultraviolet (UV) irradiation, ...

Feb. 4, 2015

By IWA Publishing

Evaluating the efficacy of pre-oxidation for enhancing removal of HAA5 precursors by conventional drinking water treatment

The formation potentials of five haloacetic acids (HAA5FP) in 13 surface water samples taken from eight cities from northeast to south China were evaluated using the simulated distribution system (SDS) chlorination method. These samples showed a wide range of HAA5FP levels (20 to 443▒μg▒L−1). Four pre-oxidation methods were evaluated for their performance in enhancing HAA5FP removal from six ...

Jan. 1, 1900

By IWA Publishing

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