An investigation on the use of ultraviolet light emitting diodes (UV LEDs) in a plug‐flow reactor for water treatment

Almquist, Catherine B.; Fyda, Sarah; Godby, Nate; Miller, Michael E.

doi:10.1002/ep.12525

Cited by 4 publications

(1 citation statement)

References 39 publications

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“…However, one of the main drawbacks of using UV-LEDs in water treatments is that turbidity, caused by the presence of substances such as ions, organic matter, or humic substances, can inhibit the oxidation process by acting as scavengers of radicals and blocking the irradiance of the photoreactors resulting in a decrease of the final yield. Other physicochemical parameters such as temperature or pH might also affect the degradation process [ 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Study of the Photodegradation of PBDEs in Water by UV-LED Technology

Valentí-Quiroga¹,

Gonzalez-Olmos²,

Auset³

et al. 2021

Molecules

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Polybrominated diphenyl ethers (PBDEs) are persistent organic pollutants that can arrive to water bodies from their use as flame retardants in a wide range of applications, such as electric and electronic devices or textiles. In this study, the photodegradation of PBDEs in water samples when applying UV-LED radiation was studied. Irradiation was applied at three different wavelengths (255 nm, 265 nm and 285 nm) and different exposure times. The best degradation conditions for spiked purified water samples were at 285 nm and 240 min, resulting in degradations between 67% and 86%. The optimized methodology was applied to real water samples from different sources: river, marine, wastewater (effluent and influent of treatment plants) and greywater samples. Real water samples were spiked and exposed to 4 hours of irradiation at 285 nm. Successful photodegradation of PBDEs ranging from 51% to 97% was achieved for all PBDE congeners in the different water samples with the exception of the marine one, in which only a 31% of degradation was achieved.

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Section: Introductionmentioning

confidence: 99%

Study of the Photodegradation of PBDEs in Water by UV-LED Technology

Valentí-Quiroga¹,

Gonzalez-Olmos²,

Auset³

et al. 2021

Molecules

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show abstract

Recent advances in application of UV light-emitting diodes for degrading organic pollutants in water through advanced oxidation processes: A review

2018

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Design and implementation of water purification system based on deep ultraviolet light emitting diodes and a multi-pass geometry reactor

Pramanik

Das

Adhikary

et al. 2020

Journal of Water and Health

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A novel reactor was designed and implemented for water purification using deep ultraviolet light emitting diodes (LEDs). The focus was on minimizing the number of LEDs required for effective germicidal action. Simulation studies were carried out on the flow of water as well as the irradiance of UV. Variation was made in the beam divergence of the UV sources and reflectivity of optical coatings used for photon recycling. Based on optimized reactor designs, water purification was carried out both in the static and flow-through configuration. Water from various sources was spiked with a known bacterial strain, exposure studies were carried out and germicidal effect was determined. Our results indicate that under optimal design, a 3 mL volume of water shows a three order inactivation using a single UV-LED in a static reactor in 180 s. For a flow-through geometry, only three LEDs were used in the reactor implementation, and a multi-pass procedure was used to purify 150 mL of water from an Escherichia coli CFU count of 4.3 × 104/mL to 12/mL. While slow, this process requires less than 2 W, and can be powered from rechargeable sources. Faster processes can be implanted using multiple such reactor units in parallel, and can be optimized to the requirement and power levels.

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An investigation on the use of ultraviolet light emitting diodes (UV LEDs) in a plug‐flow reactor for water treatment

Cited by 4 publications

References 39 publications

Study of the Photodegradation of PBDEs in Water by UV-LED Technology

Study of the Photodegradation of PBDEs in Water by UV-LED Technology

Recent advances in application of UV light-emitting diodes for degrading organic pollutants in water through advanced oxidation processes: A review

Design and implementation of water purification system based on deep ultraviolet light emitting diodes and a multi-pass geometry reactor

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