Technical Papers

Featured

Enhanced TOC Reduction in Pharmaceutical Water Systems Using Highly Reflective UV Disinfection Reactors, June 11, 2013 – John Wammes-Co-founder, President & CEO of Water Works, Inc., Gwynne Cavender-Microbiologist, NeoTech Aqua Solutions, Inc., George Diefenthal-COO, NeoTech Aqua Solutions, Inc., Randy Cooper, Ph.D. – Founder, NeoTech Aqua Solutions, Inc.
This article summarizes the use of a highly reflective UV reactors in a UPW system designed for pharmaceutical production or biotech lab applications reducing the measured TOC levels from on the order of 30 ppb to about 3 ppb.

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High-Reflectivity UV Treatment Chamber Design, June 7, 2011 – Randy Cooper, Ph.D. – Founder, NeoTech Aqua Solutions, Inc.
This white paper describes in detail and quantifies the performance advantages of the ReFleX high-reflectivity UV treatment chamber when compared to conventional polished stainless steel treatment chambers for UV disinfection and organic destruction. The paper discusses the optical and fluid flow characteristics of the ReFleX chambers in detail.

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High-Reflectivity UV Treatment Chamber Disinfection Performance Data, July 5, 2011 – Randy Cooper, Ph.D. – Founder, NeoTech Aqua Solutions, Inc.
This white paper summarizes the disinfection performance test data collected for the NeoTech Aqua Solutions family of ReFleX high-reflectivity UV treatment chambers. It describes in detail the testing protocol for the chambers, provides both in-house and third party data collected from those tests, and describes the procedure by which those data are used to derive the ReFleX treatment chamber ratings.

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Direct Photolysis

N-Nitrosodimethylamine (NDMA) as a Drinking Water Contaminant – A Review – Mitch et al – Environ Eng Sci v20 no 5 – 2003
Review paper which describes the toxicity, sources, frequency of occurrences, removal reaction kinetics, and means of removal of NDMA in drinking water.

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Standard TOC removal

Photochemical Processes for Water Treatment – Legrini-Oliveros-Braun – Chem Rev 93 pp 671-698 – 1993
Review paper covering all major TOC removal processes, including advanced oxidation, photocatalytic, and direct photolysis processes. Contains a large number of data points and references to work completed at the time of publishing.

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Disinfection

Ultraviolet Light Disinfection in Drinking Water Application – an Overview – EPA report 811-R-96-002 – 1996
Comprehensive report addressing all aspects of UV disinfection of drinking water. This paper was prepared for the United States EPA as background for their incorporation of the use of UV disinfection into the most recent release of their Ground Water Disinfection Rule (GWDR).

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Advanced Oxidation Processes (AOP)

Photochemical Processes for Water Treatment – Legrini-Oliveros-Braun – Chem Rev 93 pp 671-698 – 1993
Review paper covering all major TOC removal processes, including advanced oxidation, photocatalytic, and direct photolysis processes.

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Dechlorination

Impact of Chlorine and Monochloramine on Ultraviolet Light Disinfection – Örmeci-Ishida-Linden – Duke Univ
Discusses the effect of both medium and low pressure UV on free chlorine and monochloramine used for disinfection. Defines decay rates for each compound due to illumination by UV light.

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Photolysis of Aqueous Free Chlorine Species (HOCl and OCl-) with 254 nm Ultraviolet Light-Feng-Smith-Bolton-J Environ Eng Sci 6 – 2007
The UV molar absorption coefficients for aqueous free chlorine species are given as a function of pH and concentration of the particular free chlorine species. Also contains data demonstrating the effect of contaminants on UV dechlorination rate.

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UV Photolysis of DBPs in Chlorinated Recreational Water – Blatchley & Li – Purdue Univ
Presentation of work done on creation of disinfection by products (DBP) in pools and spas, and the effectiveness of UV in eliminating both the chlorine and the DBPs.

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Ozone Destruction

Ozonation and UV irradiation-an introduction and examples of current applications – Summerfelt – Aquacultural Engineering – Nov 2002
This paper is mainly concerned with ozone disinfection for aquaculture application and describes the use of UV + ozone as a disinfectant.

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