Theoretical Evaluation of UV Reactors in Series

Lawryshyn, Yuri; Hofmann, Ron

doi:10.1061/(asce)ee.1943-7870.0000924

Cited by 8 publications

(6 citation statements)

References 15 publications

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“…Mercury -low pressure lamps Mercury -medium pressure lamps [32][33][34][35][36][37] LED lamps [6,7, Source not mentioned [2,[60][61][62][63][64][65][66][67][68][69][70][71][72]…”

Section: Type Of Uv Source Referencesmentioning

confidence: 99%

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State of the art of UV water treatment technologies and hydraulic design optimisation using computational modelling

Shah

Židonis²,

Aggidis

2021

Journal of Water Process Engineering

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“…Mercury -low pressure lamps Mercury -medium pressure lamps [32][33][34][35][36][37] LED lamps [6,7, Source not mentioned [2,[60][61][62][63][64][65][66][67][68][69][70][71][72]…”

Section: Type Of Uv Source Referencesmentioning

confidence: 99%

“…The theoretical evaluation of reactors in the series concludes that the dosage received by two identical reactors is twice the single reactor's dosage. Hence, for treating the microorganisms, which requires two times the RED value of a single reactor, can be treated using two reactors in series [72].…”

Section: Effect Of Geometrymentioning

confidence: 99%

State of the art of UV water treatment technologies and hydraulic design optimisation using computational modelling

Shah

Židonis²,

Aggidis

2021

Journal of Water Process Engineering

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“…The performance of an annular UV reactor was modeled using a refined Latin Hypercube Monte Carlo simulation with distributions for the fluence, inactivation constant, and flow; excess E. coli concentrations occurred over the long term in 16% of apparent successful systems (Abdul-Halim and Davey, 2015). Modeling by Hofmann and Lawryshyn (2015) found that the reduction equivalent dose from UV reactors in series is additive when there is complete interbank mixing, is more than additive when there is negative correlation between the dose paths in the two reactors, and is less than additive when the correlation is positive. CFD modeling showed that water flow rate and lamp arrangement have complex effects on reactor performance, with parallel lamps performing better than perpendicular lamps (Xu, Rangaiah, and Zhao, 2015).…”

Section: Ultraviolet (Uv) Radiationmentioning

confidence: 99%

Disinfection Processes

Munakata

Kuo²

2016

Water Environment Research

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“…Li et al (2013) studied the in situ detailed FR distributions in a water disinfection UV reactor with several low pressure (LP) lamps using the novel micro-fluorescent silica detector (MFSD) with the experimental results compared with those of an FR model. Qiang et al (2013) Lawryshyn and Hofmann (2015) developed a theoretical framework for reactors in series and found that two matching UV reactors in series can provide a reduction equivalent dose (RED) better than or equal to twice of one UV system. Solari et al (2015) proposed a faster, less expensive, and more sustainable validation technique of water disinfection UV systems that uses photochromic materials.…”

Section: Introductionmentioning

confidence: 99%

Computational analysis of three lamp close conduit water disinfection UV reactor

Sultan

Ahmad

Hayat

et al. 2021

Int. J. Environ. Sci. Technol.

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The purpose of ultraviolet (UV) disinfection is to bring to end the growth and procreation of microorganism. UV reactors are used for the UV disinfection of the drinking water. Our goal of the current research work was properly locating the positions of the UV lamps in a three-lamp close conduit water disinfection UV reactor. Three positions of UV lamps are based on vertices of the four basic types of triangles (Equilateral, Right angle, Scalene and Isosceles). The objective function for optimized lamp positioning was Reduction Equivalent Dose (RED). To ascertain efficient UV dose delivery to pathogen, water disinfection UV reactors was simulated with the aid of computational fluid dynamics. The computational investigation was achieved employing ANSYS ® Fluent 15.0 academic version. The turbulent flow was modeled using standard k−ε model, fluence rate (FR) was modeled using UVCalc3D model and pathogen transport was modeled using discrete phase model. The scalene lamp positioning results in highest RED value and isosceles lamp positioning results in lowest RED value. There is meager difference between the RED values of equilateral and scalene lamp positioning. Moreover, we found two lamps on the upstream side and one lamp on the downstream side results in better UV disinfection. The proposed methodology for the three-lamp model provides useful insights to the design and optimization of close conduit water disinfection UV reactor. This research work has evaluated, for the first time, a systematic methodology for three-lamp positioning to ameliorate the performance of UV reactor and has revitalized the comprehension about the contribution of FR distribution within the UV reactor. KeywordsCFD • Fluence rate • Reactor design • Turbulence modeling • UV lamp • Water disinfection List of symbols A and B Constants in logarithm microbial inactivation rate function dt Pathogens residing time (s) I Irradiance of UV radiation (W m −2 ) k Inactivation rate constant (m 2 J −1 ) K in Turbulent kinetic energy (m 2 s −2 ) N Pathogen influent ( −) N 0 Pathogens effluent ( −) N/N 0 Log inactivation ( −) p Means pressure ( −) t Time (s) u i and u j Velocity components (m s −1 ) u in Velocity at inlet (m s −1 ) u i u j Reynolds stress tensor (m 2 s −2 ) ij Kronecker delta function ε in Turbulent dissipation at inlet (m 2 s −3 ) Laminar kinematic viscosity (m 2 s −1 ) t Turbulent kinematic viscosity (m 2 s −1 ) Density (kg m −3 ) k Prandtl-Schmidt number for K in ( −) Prandtl-Schmidt number for K (−) Subscripts i, j Position of a cell in Inlet Abbreviations CFD Computational fluid dynamics DBPs Disinfection-by-products DPM Discrete phase model FR Fluence rate RED Reduction equivalent dose SURF Simultaneous UV FR and fluid dynamics Editorial responsibility: Samareh Mirkia.

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Theoretical Evaluation of UV Reactors in Series

Cited by 8 publications

References 15 publications

State of the art of UV water treatment technologies and hydraulic design optimisation using computational modelling

State of the art of UV water treatment technologies and hydraulic design optimisation using computational modelling

Disinfection Processes

Computational analysis of three lamp close conduit water disinfection UV reactor

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