Enhanced inactivation of E. coli by pulsed UV-LED irradiation during water disinfection

Zou, Xiang-Yun; Lin, Yi-Li; Xu, Bin; Cao, Tongcheng; Tang, Yongchun; Pan, Yang; Gao, Ze-Chen; Gao, Naiyun

doi:10.1016/j.scitotenv.2018.08.367

Cited by 66 publications

(27 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Although different UV-LEDs were employed, similar findings were also reported in other studies reported in literature [55][56][57]. However, an enhanced inactivation efficiency by PL over CW UV-LED irradiation is reported [58][59][60][61]. These discrepancies could be attributed mainly to unequal fluences between the PL and CW UV-LEDs, which is key in microbial inactivation.…”

Section: E Coli Inactivation Efficiencysupporting

confidence: 79%

Effects of UV-LED Irradiation on E. coli in Water Disinfection

Nyangaresi¹,

Zhang²,

Shen³

2020

E. Coli Infections - Importance of Early Diagnosis and Efficient Treatment

View full text Add to dashboard Cite

Ultraviolet light-emitting diode (UV-LED) is a newly emerging UV light source with a potential of replacing the conventional chemical methods, mercury UV lamps and xenon lamps in water disinfection applications. In this chapter, we will first give a general description on the status of E. coli disinfection in water by UV-LEDs. Then the main text will concentrate on our experimental studies. We will discuss the effects of single and combined UV-LED irradiation on E. coli in water, including the inactivation efficiency, the recover percentage after the UV-LED irradiation, the optimal wavelength for low energy consumption, differences in pulsed and continuous operations of UV-LEDs, effect of UVA-LED followed by UVC-LED irradiation and vice versa, and finally the effect of TiO 2-assisted photocatalytic disinfection.

show abstract

Section: E Coli Inactivation Efficiencysupporting

confidence: 79%

Effects of UV-LED Irradiation on E. coli in Water Disinfection

Nyangaresi¹,

Zhang²,

Shen³

2020

E. Coli Infections - Importance of Early Diagnosis and Efficient Treatment

View full text Add to dashboard Cite

show abstract

“…A recent study by Zou et al. (2019) buttressed this point. The researchers compared the efficacy of 265‐ and 280‐nm LEDs in a continuous and pulsed mode for E. coli inactivation.…”

Section: Influence Of Individual Uv‐leds On Microbial Inactivationmentioning

confidence: 92%

Recent advances on the application of UV‐LED technology for microbial inactivation: Progress and mechanism

Kebbi

Muhammad

Sant’Ana

et al. 2020

Comp Rev Food Sci Food Safe

View full text Add to dashboard Cite

Conventional technologies for the inactivation of microorganisms in food products have their limitations, especially changes in quality attributes that have led to quality deterioration, low consumer acceptance, impact on the environment, and potential health hazards (carcinogens). Ultraviolet (UV) light is an emerging promising nonthermal technology employed for microbial inactivation in water, liquid, and solid food products to curtail the limitations above. This review provides an insight into UV light-emitting diodes (UV-LEDs)' potential as an alternative to the traditional UV lamps for microbial inactivation in liquid and solid media. Also, the mechanisms of inactivation of lone and combined UVA-, UVB-, and UVC-LEDs were discussed. The strategies utilized to improve the efficacy between the UV-LED treatments at various wavelengths were summarized. Combining different UV-LEDs treatments at different wavelengths have a synergistic effect and suppression of microbial cell reactivation. The UV-LED-based advanced oxidation processes (AOPs) also have high germicidal action against numerous microorganisms and are efficient for the degradation of micropollutants. Among the UV-LEDs discussed, UVC-LED has the most antimicrobial effect with the most efficient micropollutants decomposition with regards to UV-LED-based AOPs. This review has provided vital information for future application, development, and customization of UV-LED systems that can meet the food and water safety requirements and energy efficiency.

show abstract

“…Several studies have proven that UVC-LEDs can effectively inactivate pathogen in water. 32,33 Currently, one major disadvantage of UVC-LEDs is that, to disinfect the same volume of room air that the conventional mercury vapor lamp would sterilize, a lot of UVC-LEDs are required due to their characteristic low wattages. Another key concern is that UVC-LEDs dissipate lots of wasted heat.…”

Section: Practical Implicationsmentioning

confidence: 99%

“…For sterilization or disinfection applications, high power rating UVC‐LEDs are required, and they are only available commercially just a few years ago. Several studies have proven that UVC‐LEDs can effectively inactivate pathogen in water . Currently, one major disadvantage of UVC‐LEDs is that, to disinfect the same volume of room air that the conventional mercury vapor lamp would sterilize, a lot of UVC‐LEDs are required due to their characteristic low wattages.…”

Section: Introductionmentioning

confidence: 99%

Comparison of disinfection performance of UVC‐LED and conventional upper‐room UVGI systems

2019

View full text Add to dashboard Cite

We developed a novel, compact upper‐room ultraviolet germicidal irradiation system with light‐emitting diode sources (UR‐UVGI‐LED) to enhance the disinfection of bioaerosols in an enclosed room space. Its effectiveness was evaluated and compared with the conventional upper‐room ultraviolet germicidal irradiation system with mercury vapor sources (UR‐UVGI‐MV). Escherichia coli, Serratia marcescens, and Staphylococcus epidermidis were atomized under the well‐mixed condition and exposed to UR‐UVGI‐LED (or UR‐UVGI‐MV) device. The intensity output of the UR‐UVGI‐LED was also varied from 0% (no LED), 25%, 50% to 100% to further evaluate the UR‐UVGI‐LED disinfection effectiveness under different power levels. The decay rates for UR‐UVGI‐LED ranged from −0.1420 ± 0.04 min−1 to −0.3331 ± 0.07 min−1 for Escherichia coli, −0.1288 ± 0.01 min−1 to −0.3583 ± 0.02 min−1 for Serratia marcescens, and −0.0330 ± 0.01 min−1 to −0.0487 ± 0.01 min−1 for Staphylococcus epidermidis. It was noticed that the intensity level had a non‐linear influence on the UR‐UVGI‐LED’s performance. The decay rates achieved by the UR‐UVGI‐MV system were −0.3867 ± 0.08 min−1, −0.4745 ± 0.002 min−1, and −0.1624 ± 0.02 min−1 for Escherichia coli, Serratia marcescens, and Staphylococcus epidermidis, respectively. Hence, the disinfection performance of both UR‐UVGI‐LED and UR‐UVGI‐MV systems was comparable for Escherichia coli and Serratia marcescens. These results demonstrate that the UR‐UVGI‐LED system has a high potential to be used as a safe and effective irradiated light source to disinfect indoor airborne pathogens.

show abstract

Enhanced inactivation of E. coli by pulsed UV-LED irradiation during water disinfection

Cited by 66 publications

References 30 publications

Effects of UV-LED Irradiation on E. coli in Water Disinfection

Effects of UV-LED Irradiation on E. coli in Water Disinfection

Recent advances on the application of UV‐LED technology for microbial inactivation: Progress and mechanism

Comparison of disinfection performance of UVC‐LED and conventional upper‐room UVGI systems

Contact Info

Product

Resources

About