Development of a method for the characterization and operation of UV-LED for water treatment

Kheyrandish, Ataollah; Mohseni, Madjid; Taghipour, Fariborz

doi:10.1016/j.watres.2017.06.015

Cited by 75 publications

(36 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Kim et al [11] obtained higher inactivation of MS2 with LEDs compared to LPUV lamps at both wavelengths of 266 and 279 nm, respectively. In addition to the slightly different wavelengths investigated in these studies, the great diversity in UV-LED reactor configurations, radiation profiles and microbiological methods makes direct comparisons difficult [27]. Beck et al [8] noted that the discrepancies between their study and that of Bowker et al [3] were most likely due to the fact that the latter considered UV-LEDs to be a monochromatic light source.…”

Section: Uv Fluence Determination and Ms2 Inactivationmentioning

confidence: 99%

“…Beck et al [8] noted that the discrepancies between their study and that of Bowker et al [3] were most likely due to the fact that the latter considered UV-LEDs to be a monochromatic light source. Instead, there seems to be a consensus in recent studies that UV-LEDs are polychromatic light sources with Gaussian-distributed emission spectra with relatively narrow bandwidths [27,28]. It is thought that polychromatic light could have multiple pathways of inactivation by: (i) supplying photons which target the absorption maxima of different microorganisms; (ii) provide alternative mechanisms of inactivation (e.g., free radical or reactive oxygen species production); (iii) crosslinking more of the DNA/RNA at key active sites within the genetic code and (iv) damaging other functional structures within microorganisms (e.g., capsid) [29].…”

Section: Uv Fluence Determination and Ms2 Inactivationmentioning

confidence: 99%

“…A further benefit of operating at UV-LEDs at 275 nm is that this wavelength provides a good balance between disinfection efficacy and UV-LED energy consumption, since there is an approximate doubling in the energy demand moving from 275 nm to 260 nm [5,10]. The ability of UV-LEDs to be tuned to a desired wavelength in addition to their diversity in structure and radiation profiles mean that UV-LEDs should not be considered as only a substitute source of light but a tool for precision in water treatment [2,13,27].…”

Section: Uv Fluence Determination and Ms2 Inactivationmentioning

confidence: 99%

See 2 more Smart Citations

Application of Ultraviolet Light-Emitting Diodes (UV-LED) to Full-Scale Drinking-Water Disinfection

Jarvis

Autin²,

Goslan

et al. 2019

Water

View full text Add to dashboard Cite

Ultraviolet light-emitting diodes (UV-LEDs) have recently emerged as a viable technology for water disinfection. However, the performance of the technology in full-scale drinking-water treatment systems remains poorly characterised. Furthermore, current UV disinfection standards and protocols have been developed specifically for conventional mercury UV systems and so do not necessarily provide an accurate indication of UV-LED disinfection performance. Hence, this study aimed to test the hypothesis that a full-scale UV-LED reactor can match the Cryptosporidium inactivation efficiency of conventional mercury UV reactors. Male-specific bacteriophage (MS2) was used as the Cryptosporidium spp. surrogate microorganism. The time-based inactivation efficiency of the full-scale reactor was firstly compared to that of a bench-scale (batch-type) UV-LED reactor. This was then related to mercury UV reactors by comparing the fluence-based efficiency of the bench-scale reactor to the USEPA 90% prediction interval range of expected MS2 inactivation using mercury UV lamps. The results showed that the full-scale UV-LED reactor was at least as effective as conventional mercury UV reactors at the water-quality and drive-current conditions considered. Nevertheless, comparisons between the bench- and full-scale UV-LED reactors indicated that improvements in the hydraulic flow profile and power output of the full-scale reactor could help to further improve the efficiency of UV-LED reactors for municipal drinking water disinfection. This represents the world’s first full-scale UV-LED reactor that can be applied at municipal water treatment works for disinfection of pathogenic microorganisms from drinking water.

show abstract

Section: Uv Fluence Determination and Ms2 Inactivationmentioning

confidence: 99%

Section: Uv Fluence Determination and Ms2 Inactivationmentioning

confidence: 99%

Section: Uv Fluence Determination and Ms2 Inactivationmentioning

confidence: 99%

See 1 more Smart Citation

Application of Ultraviolet Light-Emitting Diodes (UV-LED) to Full-Scale Drinking-Water Disinfection

Jarvis

Autin²,

Goslan

et al. 2019

Water

View full text Add to dashboard Cite

show abstract

“…The optical performance of the UV-LED devices has been studied by Kheyrandish et al showing that higher solder point temperatures (T S ) resulted in lower optical output power, shift of the peak wavelength, and an increase of the full width at half maximum (FWHM) [5]. The achieved internal quantum efficiency (IQE) of UV-C LEDs can be quite high, that is, somewhere between 15 and 70%, supported by photoluminescence studies and ray-tracing calculations.…”

Section: Efficiency Droop and Optical Performance Of Uv-ledsmentioning

confidence: 99%

“…It is known that the UV-C LEDs have lower external quantum efficiency (EQE) with a value less than 10%, compared with conventional LED light sources, for example, blue LED (400-450 nm) has an EQE > 70%. In microbiological research, the shift of the peak wavelengths would result in an inaccurate interpretation in microbial studies [5].…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric Control of Deep UV LED to Improve Optical Performance

Fredes¹,

Raff²,

Gramsch³

et al. 2019

Advanced Thermoelectric Materials for Energy Harvesting Applications

View full text Add to dashboard Cite

A thermoelectric control system using thermoelectric cooler devices (TEC) combined with an aluminum heat dissipater and a fan heat extractor allows improving considerably the optical performance of deep UV LEDs (285 nm) operating at desired temperatures. A proportional, integral, and differential controller (PID) control technique was implemented to control the voltage in the TEC devices, and therefore, the desired range of temperatures can be achieved. The PID parameters are obtained with computational simulations based on physical models and experimental data recordings of the temperature, using a thermistor sensor for the temperature measurements and SiC photodiode with UV enhanced system for the optical power measurements. The experimental data show that decreasing the temperature of the UV-C LED light source using a TEC increases the optical output power, while it has been shown that the lifetime of the LED devices can be improved.

show abstract

Reliability of Organic Compounds in Microelectronics and Optoelectronics

Driel

Mehr

2022

View full text Add to dashboard Cite

the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfilms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed. The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. The publisher, the authors, and the editors are safe to assume that the advice and information in this book are believed to be true and accurate at the date of publication. Neither the publisher nor the authors or the editors give a warranty, expressed or implied, with respect to the material contained herein or for any errors or omissions that may have been made. The publisher remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

show abstract

Development of a method for the characterization and operation of UV-LED for water treatment

Cited by 75 publications

References 26 publications

Application of Ultraviolet Light-Emitting Diodes (UV-LED) to Full-Scale Drinking-Water Disinfection

Application of Ultraviolet Light-Emitting Diodes (UV-LED) to Full-Scale Drinking-Water Disinfection

Thermoelectric Control of Deep UV LED to Improve Optical Performance

Reliability of Organic Compounds in Microelectronics and Optoelectronics

Contact Info

Product

Resources

About