A Potential New Method for Determination of the Fluence (UV Dose) Delivered in UV Reactors Involving the Photodegradation of Free Chlorine

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Abstract:

In the operation of UV reactors, an important step is to validate if the UV reactor can deliver the design fluence (UV dose) to achieve the required disinfection credit. Free chlorine is used widely in water and wastewater treatment and often is found in the water passing through a UV reactor. Free chlorine is degraded when passing through a UV reactor. This study investigates the potential application of the photodegradation of free chlorine (PFC) to determine the fluence (UV dose) delivered in UV reactors. Using a bench-scale UV reactor, the PFC was investigated at difference UV doses, which also were measured by a biodosimetry method. The results obtained here show that the PFC method has a high correlation with the delivered UV dose (as estimated from the biodosimetry measurements) and is independent of operating conditions, such as flowrate and UV transmittance. In addition, this study indicates that only chloride and chlorate are generated when free chlorine is photodegraded.

Keywords: UV reactor; biodosimetry; free chlorine; photodegradation; quantum yield

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/106143009X447920

Publication date: April 1, 2010

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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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