ultraviolet drinking water Articles

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 ...

Jan. 1, 1998

By Calgon Carbon Corporation

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

Velocity Profiling Versus Checkpoint Bioassay for Performance Testing of UV Disinfection Systems

As the recycled water industry is shifting from the use of theory based design of UV disinfection systems to a performance based design approach, there must be method for correlating the performance of one pilot-scale UV disinfection system to that of a full-scale system. Two methods for using existing performance data for the design and operation of future UV systems are presented in this ...

Oct. 21, 2006

By Water Environment Federation (WEF)

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 ...

Feb. 20, 2021

By Genaq Technologies S.L.

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)

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 ...

Jan. 1, 2007

By Degremont Technologies - a subsidiary of Suez Environnement

UV Systems for Reclaimed Water Disinfection – From Equipment Validation to Operation

The Sanitation Districts of Los Angeles County (Districts) operate seven tertiary water reclamation plants (WRPs) with a combined treatment capacity over 200 million gallons per day (MGD). Although chloramination has provided reliable and effective disinfection, the Districts decided to change this disinfection practice at one of the WRPs to ultraviolet (UV) irradiation to minimize ...

Oct. 21, 2006

By Water Environment Federation (WEF)

Sensor Setpoint Validation of Reclaimed Water UV Reactors

ABSTRACTReclaimed water ultraviolet light (UV) disinfection system can be a critical component of a multiple barrier approach for public health protection. Current control methodologies rely upon assumed end of lamp life factors and sleeve fouling factors, which often result in overdosing when the lamps are new and the sleeves are clean and underdosing as the lamps age and the sleeves foul. The ...

Oct. 22, 2006

By Water Environment Federation (WEF)

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 ...

Jul. 1, 2015

By atg UV Technology

City of Albany, NEW YORK

Since the 1930s, the City of Albany, New York, has used the 200 million gallon Loudonville open-air reservoir as a backup for the city’s primary Alcove reservoir. If the Alcove treatment plant shut downs or a water main breaks, the Loudonville reservoir could supply water to Albany’s 100,000 residents for up to ten days. This system, which uses chlorine disinfection, has served the city well ...

Sep. 8, 2006

By Trojan Technologies - a subsidiary of Danaher Corporation

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 ...

Dec. 9, 2016

By IWA Publishing

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 ...

Sep. 2, 2015

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

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 ...

Jan. 1, 1994

By Calgon Carbon Corporation UV Technologies Division

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 ...

Apr. 20, 2002

By Hanovia Ltd - a Halma Company

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 ...

Jan. 1, 2007

By Degremont Technologies - a subsidiary of Suez Environnement

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

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 ...

Mar. 21, 2017

By IWA Publishing

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, ...

Sep. 28, 2016

By IWA Publishing

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 ...

Jan. 1, 2007

By Degremont Technologies - a subsidiary of Suez Environnement