In situ detailed fluence rate distributions in a UV reactor with multiple low-pressure lamps: Comparison of experimental and model results

Li, Mengkai; Qiang, Zhimin; Bolton, James R.

doi:10.1016/j.cej.2012.10.024

Cited by 13 publications

(12 citation statements)

References 22 publications

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“…S2). The relatively inhomogeneous FR distribution when the lamps were either close to each other or near the reactor wall was also observed by Li et al [23], as supported by their in-situ measured FR data. The existence of dark zones was another reason for the poor performance of reactors with d r = 0.7, and the relatively more homogeneous FR distribution in reactors with d r = 0.5 generally led to a better performance.…”

Section: Effects Of Lamp Relative Distance and Inlet Id On Reactor Pesupporting

confidence: 67%

Configuration optimization of UV reactors for water disinfection with computational fluid dynamics: Feasibility of using particle minimum UV dose as a performance indicator

Bolton

et al. 2016

Chemical Engineering Journal

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h i g h l i g h t sD min was used as a performance indicator for UV reactor configuration optimization. D min proved to be a qualified alternative to RED for UV reactor optimal design. Reactor with a well-mixed flow dispersed by lamp array had the best performance. Disinfection capability of the optimally designed UV reactor was elevated by 47À100%. t r a c tComputational fluid dynamics is a powerful tool for ultraviolet (UV) reactor performance evaluation, since it allows the reactor configuration optimization by comparing the performance indicator [e.g., reduction equivalent dose (RED)] of various UV reactors. In this study, a new performance indicator independent of the microbial UV dose-response curve, namely particle minimum UV dose (D min ), was introduced, and its feasibility was evaluated in the configuration optimization of 3-lamp UV reactors for water disinfection. Results indicate that the D min could serve as an alternative to the RED in characterizing the UV reactor performance. In general, reactors with a normal (NOR) lamp position pattern (i.e., with one lamp on the top and two at the bottom) had larger D min values (110À193 mW cm À2) than those with a reverse (REV) lamp position pattern (i.e., with two lamps on the top and one at the bottom) (98À160 mW cm ) was obtained in an UV reactor with a lamp relative distance (i.e., the ratio of the distance between the lamp and reactor axes to the reactor radius) of 0.4 and an inlet internal diameter of 75 mm, which could be ascribed to a well-mixed flow resulting from an optimal dispersion of the influent flow by the lamp array. The maximum disinfection flow rate of the UV reactor with the optimal configuration was elevated by 47À100% compared to those of the non-optimally designed reactors, which led to an energy saving efficiency of 32À50%.

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Section: Effects Of Lamp Relative Distance and Inlet Id On Reactor Pesupporting

confidence: 67%

Configuration optimization of UV reactors for water disinfection with computational fluid dynamics: Feasibility of using particle minimum UV dose as a performance indicator

Bolton

et al. 2016

Chemical Engineering Journal

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“…It would also be useful to confirm the accuracy of our calculations in the context of work done recently by Li and others (2012, 2013) that supports the assumption made in this paper that adjacent fluorescent tubes in a circular reactor shadow volume elements from the full output of all lamps. 2012Li and others (, 2013) modelled and experimented with a three-lamp scenario and it would be interesting to extend and compare their findings to the lamp described in this paper through a series of measurements under controlled conditions.…”

Section: Discussionsupporting

confidence: 81%

Design considerations and solutions in rapid-prototyping an ultraviolet reactor for ice borehole disinfection

Keen¹,

Brito

2014

Ann. Glaciol.

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Antarctic subglacial lakes are of great interest to the science community. These systems are considered to be in pristine condition, potentially harbouring an environment containing undisturbed sedimentary sequences and ecosystems adapted to cold oligotrophic environments in the absence of sunlight. Gaining access to subglacial lakes presents major technological challenges. To comply with conventions covering the exploration of pristine Antarctic environments, access should be conducted so the lake is not contaminated in any way. Consequently, all equipment to enter the lake must be sterile and the entrance should isolate the lake from the external environment. Currently, clean access to these environments is achieved using a hot-water drilling system. Differences between the hydraulic pressure head of the lake and the glacial surface result in a section of the borehole being air-filled. It is imperative that this section is disinfected prior to introducing any sampling equipment. This paper describes the design process involved in rapid-prototyping an ultraviolet (UV) disinfection reactor for achieving this goal. Considerations such as UV output, physical constraints, temperature management, and deployment procedures are assessed. We present a design that addresses these considerations.

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“…A radiation field (PFR distribution) model (UVCalc version 1, Bolton Photosciences Inc., Edmonton, Alberta, Canada) was chosen to simulate the PFR distributions at various wavelengths and UV transmittances (UVTs) . Previous research has shown good agreement between UVCalc predictions and experimental measurements in various UV reactors. − …”

Section: Methodsmentioning

confidence: 99%

Micropollutant Degradation by the UV/H₂O₂ Process: Kinetic Comparison among Various Radiation Sources

Wen

et al. 2019

Environ. Sci. Technol.

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Kinetic comparisons of micropollutant degradation by ultraviolet (UV) based advanced oxidation processes among various radiation sources are an important issue, yet this is still a challenge at present. This study investigated comparatively the kinetics of sulfamethazine (SMN) degradation by the UV/H2O2 process among three representative radiation sources, including low-pressure mercury UV (LPUV, monochromatic), medium-pressure mercury UV (MPUV, polychromatic), and vacuum UV(VUV)/UV (dual wavelengths causing different reaction mechanisms) lamps. Experiments were conducted with a newly developed mini-fluidic MPUV photoreaction system and a previously developed mini-fluidic VUV/UV photoreaction system. Measured and modeled results both indicate that the photon fluence-based SMN degradation rate constant (k p ′) followed a descending order of VUV/UV/H2O2 > MPUV/H2O2 (200–300 nm) > LPUV/H2O2, and the k p ′ of the MPUV lamp was dependent on the wavelength range selected for photon fluence calculation. Analysis of potential errors revealed that a shorter effective path-length could have a lower error, and the maximum errors for the MPUV/H2O2 and LPUV/H2O2 processes in this study were 7.7% and 18.2%, respectively. This study has developed a new method for kinetic comparisons of micropollutant degradation by UV-AOPs among various radiation sources at bench-scale, which provides useful reference to practical applications.

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In situ detailed fluence rate distributions in a UV reactor with multiple low-pressure lamps: Comparison of experimental and model results

Cited by 13 publications

References 22 publications

Configuration optimization of UV reactors for water disinfection with computational fluid dynamics: Feasibility of using particle minimum UV dose as a performance indicator

Configuration optimization of UV reactors for water disinfection with computational fluid dynamics: Feasibility of using particle minimum UV dose as a performance indicator

Design considerations and solutions in rapid-prototyping an ultraviolet reactor for ice borehole disinfection

Micropollutant Degradation by the UV/H₂O₂ Process: Kinetic Comparison among Various Radiation Sources

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In situ detailed fluence rate distributions in a UV reactor with multiple low-pressure lamps: Comparison of experimental and model results

Cited by 13 publications

References 22 publications

Configuration optimization of UV reactors for water disinfection with computational fluid dynamics: Feasibility of using particle minimum UV dose as a performance indicator

Configuration optimization of UV reactors for water disinfection with computational fluid dynamics: Feasibility of using particle minimum UV dose as a performance indicator

Design considerations and solutions in rapid-prototyping an ultraviolet reactor for ice borehole disinfection

Micropollutant Degradation by the UV/H2O2 Process: Kinetic Comparison among Various Radiation Sources

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Micropollutant Degradation by the UV/H₂O₂ Process: Kinetic Comparison among Various Radiation Sources