Sterilization of Harmful Microorganisms in Hydroponic Cultivation Using an Ultraviolet LED Light Source

Kim, Beom-Su; Youm, Sungkwan; Kim, Yong-Kab

doi:10.18494/sam.2020.2979

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…The relationship between these factors should be investigated in future studies. To further understand the relationship between plant growth and flow patterns in hydroponics, it is essential to study the combined effects of flow patterns with other environmental factors (nutrient solution composition and concentration [8], temperature [28], salinity [11], light intensity and wavelength [34], dissolved oxygen [35], etc.) on the roots and whole plant.…”

Section: Discussionmentioning

confidence: 99%

Effect of the Flow Rate on Plant Growth and Flow Visualization of Nutrient Solution in Hydroponics

et al. 2021

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In hydroponics, the flow pattern of nutrient solution in a cultivation container affects the growth of plants. Even if the flow rate of nutrient solution is the same between containers, the flow pattern may differ based on the size and shape of the containers. Therefore, the flow pattern cannot be comprehensively described by flow rate alone. In order to identify the relationship between plant growth, root morphology, nutrient uptake, and flow pattern, a hydroponic cultivation of Swiss chard was carried out. In addition, in order to describe the flow pattern in a specific cultivation container, hydroponic flow patterns were observed via flow field visualization using particle image velocimetry. As a result, with the increase in flow rate, it was found that a specific flow rate can form an ideal flow pattern for plant growth. Under this flow pattern, nutrient absorption is promoted and roots are elongated, thereby absorbing more nutrients and further promoting plant growth. However, when the flow rate exceeds the ideal value, plant growth is hindered. In summary, identifying the ideal nutrient solution flow pattern in hydroponics can facilitate better crop production.

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Section: Discussionmentioning

confidence: 99%

Effect of the Flow Rate on Plant Growth and Flow Visualization of Nutrient Solution in Hydroponics

et al. 2021

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“…LEDs are recognized for being environmentally friendly, energy efficient, capable of close-range irradiation, and for generating minimal heat [17]. Research studies have demonstrated that LED light irradiation is highly effective in suppressing the growth of surface microorganisms on fruits and vegetables [18]. Furthermore, it has been observed that it slows down ethylene release and respiration rate, thereby achieving successful post-harvest preservation [19].…”

Section: Introductionmentioning

confidence: 99%

LED White Light Treatment Delays Postharvest Senescence of ‘Zaosu’ Pear Fruit with Inhibited Chlorophyll Degradation

Mi,

Zhou,

Yang

et al. 2023

Horticulturae

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To investigate the effects of LED white light treatment (LWT) on the storage quality of postharvest ‘Zaosu’ pears, as well as its role in maintaining fruit greenness and delaying senescence, pear fruits were treated with intermittent irradiation using LED white light for 12 h per day, with a light source distance of 30 ± 1 cm and a photon flux density of 151 μmoL/(m2·s) at 25 °C. The results showed that LWT preserved the postharvest quality of ‘Zaosu’ pear fruit by reducing weight loss and ascorbic acid degradation and promoting the ratio of sugar and organic acid. Meanwhile, LWT also substantially inhibited the respiration intensity and ethylene production during the storage process. Accordingly, the expressions of genes related to ethylene biosynthesis and signaling were reduced in LWT fruit. Notably, LWT retarded the decrease in chlorophyll content of fruit by increasing the activities of enzymes associated with chlorophyll synthase. Additionally, LWT also suppressed the chlorophyll degradation-related enzymes and their gene expressions in pear peel. These findings suggest that a moderate light irradiation can delay the de-green progress and benefit post-harvest storage of ‘Zaosu’ pear.

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“…Lee et al reported sterilization tests of a homemade sterilizing light source module composed of 40 UVC-LEDs, and it required 30 s to achieve 99% inactivation at an exposure distance of 10 mm [23] . Huang et al demonstrated a flexible sterilization light source consisting of a square array (3 × 3) of UVC-LEDs with an area of 5 × 5 cm 2 , which achieved a 95% sterilization inactivation for Escherichia coli in 60 s [24] . However, the integration level and the LOP of the light source are still not high enough, leading to the requirement of long sterilization time.…”

Section: Introductionmentioning

confidence: 99%

Watts-level ultraviolet-C LED integrated light sources for efficient surface and air sterilization

Luo¹,

Li²,

Wang³

et al. 2022

J. Semicond.

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With the epidemic of the coronavirus disease (COVID-19) infection, AlGaN-based ultraviolet-C light emitting diodes (UVC-LEDs) have attracted widespread attention for their sterilization application. However, the sterilization characters of high power integrated light sources (ILSs) haven’t been widely investigated before utilizing in public sanitary security. In this work, by integrating up to 195 UVC-LED chips, high power UVC-LED ILSs with a light output power (LOP) of 1.88 W were demonstrated. The UVC-LED ILSs were verified to have efficient and rapid sterilization capability, which have achieved more than 99.9% inactivation rate of several common pathogenic microorganisms within 1 s. In addition, the corresponding air sterilization module based on them was also demonstrated to kill more than 97% of Staphylococcus albus in the air of 20 m3 confined room within 30 min. This work demonstrates excellent sterilization ability of UVC-LED ILSs with high LOP, revealing great potential of UVC-LEDs in sterilization applications in the future.

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Sterilization of Harmful Microorganisms in Hydroponic Cultivation Using an Ultraviolet LED Light Source

Cited by 5 publications

References 7 publications

Effect of the Flow Rate on Plant Growth and Flow Visualization of Nutrient Solution in Hydroponics

Effect of the Flow Rate on Plant Growth and Flow Visualization of Nutrient Solution in Hydroponics

LED White Light Treatment Delays Postharvest Senescence of ‘Zaosu’ Pear Fruit with Inhibited Chlorophyll Degradation

Watts-level ultraviolet-C LED integrated light sources for efficient surface and air sterilization

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