ultraviolet drinking water Articles
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GENAQ: Pure water thanks to its exhaustive treatment
GENAQ atmospheric water generators take in ambient air, filter it and extract its moisture. Once the water is extracted by condensation, it is specially treated to obtain the highest quality water at the lowest energy cost. One of the main characteristics that make GENAQ’s atmospheric water generators superior is the quality of the water generated. Equally important is generating ...
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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 ...
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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 (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 ...
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Biodosimetry of a full-scale uv disinfection system to achieve regulatory approval for wastewater reuse
In order to respond to the stringent disinfection requirements for reclaimed wastewater in the United States, Ozonia North America (ONA) undertook a bioassay validation study of a lowpressure nvery high-output (LPVHO) ultraviolet (UV) disinfection system. The disinfection performance of this process technology was verified via biodosimetry in accordance with the Ultraviolet Disinfection ...
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Sutton and East Surrey Water - Drinking Water UV Treatment - 5000m3/hr - Case Study
atg UV Technology supplied Sutton & East Surrey Water with a US EPA UVDGM Validated solution using 3 x SX-1873-30 UV Systems. The Duty / Assist / Standby plant treats over 5,000 m3/hr of drinking water for a population of over 650,000 people, and has a redundancy of 10,000 m3/hr for future population ...
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Fifteen years of experience with standardized reference radiometers for controlling low-pressure UV disinfection plants for drinking water
The only practicable way to control the disinfection capability of a UV disinfection plant for drinking water all the time is to use a UV radiometer. According to the Austrian Standard M5873, this plant radiometer is a standardized part of each plant. The standard defines a so-called reference radiometer (RRM) as well. This is necessary because a plant radiometer has to be controlled ...
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Effect of ion (Al, Fe and Zn) co-doped TiO2 nanotubes on photocatalytic degradation of humic acids under UV/ozonation for drinking water purification
O3/UV/TiO2 was used to effectively decompose humic acids (HAs) in drinking water. A series of Al-doped, Fe-doped, Zn-doped and co-doped TiO2 nanotubes were successfully synthesized by a hydrothermal method. According to the characterization of ion-doped TiO2 nanotubes, Al3+ and Fe3+ ions occupied substitutional positions in the crystal lattice, and Zn2+ ions were partially dispersed in the ...
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Spectral distribution of uv light during aging of medium pressure UV lamps
As part of a project to validate a UV reactor for disinfection of drinking water, the germicidal output of four medium pressure lamps housed in a continuously operating reactor was followed as a function of time. Spectra were measured monthly and were used in conjunction with radiometer readings to calculate germicidal fluence rates (using DNA absorbance weighting) at the radiometer sensor ...
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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 ...
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Fundamentals of Catalytic Activated Carbons
Untitled Document Summary: Catalysts in water treatment speed chemical reactions so equipment can be scaled down or contact times shortened. Because the speed of a reaction can affect equipment price or useful life, it could mean the difference between a sale and a "no, thanks." Thus, recently developed catalytic activated carbons may enable water treatment ...
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Potential Repair of Escherichia coli DNA following Exposure to UV Radiation from Both Medium- and Low-Pressure UV Sources Used in Drinking Water Treatment
The increased use of UV radiation as a drinking water treatment technology has instigated studies of the repair potential of microorganisms following treatment. This study challenged the repair potential of an optimally grown nonpathogenic laboratory strain of Escherichia coli after UV radiation from low- and mediumpressure lamps. Samples were irradiated with doses of 5, 8, and 10 mJ/cm2 from a ...
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Offshore water injection - Case Study
Client: PPCoN Location: North Sea Description: UV disinfection of seawater for offshore reservoir injection The process of disinfecting water with UV light is a proven technology for drinking and process water in many industries. It has now been applied with great success to the disinfection of seawater for use well injection water. atg UV Technology understanding of UV disinfection combined ...
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Monitoring a high iron and manganese content borehole for hydrocarbons - Case Study
APPLICATION Monitoring a borehole for contamination from a known petroleum spill. CUSTOMER Water Company, UK PROBLEM The customer wished to monitor hydrocarbon levels in a borehole for drinking water. The customer had attempted to use a UV based system but found that the system would only last a matter of a few days before ferric and manganese deposits stopped the system from ...
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Implementing tier 2 analysis on biodosimetric test results
With both goals to develop a sizing program and an operation matrix the biodosimetric results of an in-line cross-flow reactor equipped with 6 medium pressure lamps were analyzed per the US EPA Ultraviolet Disinfection Guidance Manual (UVDGM) Tier 2 approach. Using a Tier 1 analysis was quickly ruled out for this reactor, as the surrogate microorganism used during biodosimetry was B. subtilis ...
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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 ...
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Shining a Light on the Food and Beverage Industry
As published in this months edition of Process & Control, Diane White discusses how UV systems can provide a practical, power saving alternative to pasteurisation in food and beverage production Waterborne micro-organisms are responsible for adverse effects on flavour, colour, odour and shelf life of products and, of course, potential health risks to consumers. A number of emerging ...
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Optimization of UV/H2O2 processes for the removal of organic micropollutants from drinking water: effect of reactor geometry and water pretreatment on EEO values
Increasing concentrations of organic micropollutants, like pharmaceuticals, in surface water may require additional treatment for drinking water production. The UV/H2O2 process is very effective for this purpose, but is known for its relatively high energy demand. This energy demand may be decreased by improving the water matrix composition and/or by optimizing UV reactor geometry. Thus, ...
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LIT UV-system at Lofoten archipelago.
LIT UV-system at Lofoten archipelago. The company UNIK in Norway has been successfully selling LIT UV-systems for almost four years. The company is based in Os, which is close to the town of Bergen. Earlier this year UNIK has sold and installed two LIT UV-systems in the Nusfjord water treatment plant. A technically good offer, respected references and good technical skills have finally ...
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A computational fluid dynamics analysis of placing UV reactors in series
Ultraviolet (UV) light water treatment reactors are commonly used in both wastewater and drinking water disinfection. UV technology can effectively inactivate a large number of pathogens at low UV doses, however adenovirus requires a substantially higher dose than most pathogens of interest. In order to meet adenovirus inactivation requirements, UV reactors are often placed in series and the ...
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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 ...
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