The Study of an Ultraviolet Radiation Technique for Removal of the Indoor Air Volatile Organic Compounds and Bioaerosol

This study examined the use of high dosages of ultraviolet germicidal irradiation (UVGI) (253.7 nm) to deal with various concentrations of air pollutants, such as formaldehyde (HCHO), total volatile organic compounds (TVOC), under various conditions of humidity. A number of irradiation methods were applied for various durations in field studies to examine the efficiency of removing HCHO, TVOC, bacteria, and fungi. The removal efficiency of air pollutants (HCHO and bacteria) through long-term exposure to UVGI appears to increase with time. The effects on TVOC and fungi concentration were insignificant in the first week; however, improvements were observed in the second week. No differences were observed regarding the removal of HCHO and TVOC among the various irradiation methods in this study; however significant differences were observed in the removal of bacteria and fungi.

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A Novel Approach of Ultraviolet Germicidal Irradiation to Reduce Air Pollution in Indoor Environments

10.20944/preprints201711.0145.v1 ◽

2017 ◽

Author(s):

Chao-Yun Liu ◽

Chao-Heng Tseng ◽

Huang-Chin Wang ◽

Chuan-Fa Dai ◽

Yi-Hsuan Shih

Keyword(s):

Air Pollutants ◽

Field Studies ◽

Indoor Environments ◽

Total Volatile ◽

Ultraviolet Germicidal Irradiation ◽

Novel Approach ◽

Volatile Organic ◽

Bacteria And Fungi ◽

Total Volatile Organic Compounds

This study examined the use of high dosages of ultraviolet germicidal irradiation (UVGI) (253.7 nm) to deal with various concentrations of air pollutants, such as formaldehyde (HCHO), total volatile organic compounds (TVOC), under various conditions of humidity. We also estimated the emission of ozone as a secondary pollutant of UVGI as treatment. A number of irradiation methods were applied for various durations in field studies to examine the efficiency of removing HCHO, TVOC, bacteria, and fungi. The removal efficiency of air pollutants (HCHO and bacteria) through long-term exposure to UVGI appears to increase with time. The effects on TVOC and fungi concentration were insignificant in the first week; however, improvements were observed in the second week. No differences were observed among the various irradiation methods in this study regarding the removal of HCHO and TVOC; however significant differences were observed in the removal of bacteria and fungi.

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Research of the Distribution of Volatile Organic Compounds (VOC) in Print Shops in Xi’an

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.209-211.1560 ◽

2012 ◽

Vol 209-211 ◽

pp. 1560-1565

Author(s):

Shu Yun Wu ◽

Zeng Feng Yan ◽

Jun Gang Dong ◽

Huan Huan Liu

Keyword(s):

Volatile Organic Compounds ◽

Indoor Air Quality ◽

Organic Compounds ◽

Indoor Air ◽

Air Pollutants ◽

Building Materials ◽

Volatile Organic ◽

Print Shop ◽

Indoor Air Pollutants

Volatile organic compounds (VOCs) are major constituents of the indoor air pollutants. The indoor air quality has caused wide concern for VOCs may affect human health in many ways. The VOCs in general rooms volatilize from building materials, furniture and so on. In print shops the print equipment and materials may produce a large amount of VOCs that may affect the health of the long-term print shop workers. The author has measured the VOC content and the air indexes in a seventy square-meter print shop in Xi’an with comprehensive functions, then, evaluated the pollution and proposed the preventions of the VOC content in print shops.

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Variability of Total Volatile Organic Compounds (TVOC) in the Indoor Air of Retail Stores

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph16234622 ◽

2019 ◽

Vol 16 (23) ◽

pp. 4622 ◽

Cited By ~ 3

Author(s):

Jia ◽

Cao ◽

Valaulikar ◽

Fu ◽

Sorin

Keyword(s):

Volatile Organic Compounds ◽

Organic Compounds ◽

Indoor Air ◽

High Sensitivity ◽

Temporal Variations ◽

Retail Stores ◽

Volatile Organic ◽

Systematic Understanding ◽

Total Volatile Organic Compounds ◽

Comfort Parameters

Volatile organic compounds (VOCs) are released to the indoor air of retail stores from numerous products and activities, but available literature lacks a systematic understanding of the variability of VOC concentrations. In this study, we measured concentrations of total VOCs (TVOC) in 32 retail stores using a high-sensitivity photoionization detector (PID). Indoor thermal comfort parameters, including temperature, relative humidity, and air velocity, were simultaneously measured using an anemometer. The store-level TVOC concentrations ranged from 30 to 869 ppb and exceeded the LEED guideline in 31 stores. TVOC levels were notably high in hardware stores (median = 536 ppb, p = 0.0002) and paints, household, and home accessories sections within stores (p < 0.05). TVOC levels were elevated in mornings and evenings, possibly due to low ventilation and cleaning activities at the beginning and end of business hours. The between-store, within-store, and temporal variations accounted for 85%, 0.5%, and 14% of the total variance, respectively. The variance structure suggested that in-store VOC concentrations were predominantly driven by their source location, and representative monitoring should first consider covering various store types. Current store VOC levels present health concerns, but further studies are needed to evaluate risks among customers.

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