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UV Applications for Food Plant Safety
Published in Tatiana Koutchma, Ultraviolet Light in Food Technology, 2019
American Air and Water Company also offers commercial air purifiers that can be installed in a duct system, on a ceiling, walls, and floor. Technical specifications and description can be found at www.americanairandwater.com. Mobile UV systems also can be used for air treatment in the processing rooms after cleaning. Fuller UV Inc. ( www.fulleruv.com/ultraviolet_and_ozone_lamps.html) offers simple wall fixtures made of stainless steel with UV-C lamps in protective jackets in air conditioning systems. Also, UV lamps are used in washer tanks (encapsulated lamps), and cooling coils to disinfect the air stream directly. UV air oxidation is used for odor removal (in sewage plants, rest rooms, hotels, restaurants, catering, caravan trailers, and cars), and grease destruction in kitchen hoods and industrial exhausts. For air temperatures below 40°C, standard ozone-generating low-pressure lamps are utilized. For higher temperatures, it is essential to use ozone-generating low-pressure amalgam lamps.
Pollution
Published in Sigrun M. Wagner, Business and Environmental Sustainability, 2020
Air cleaning technologies offered to consumer households include for example air purifiers and filters as well as air sterilisers and ionisers. The Healthy House, to name one online retailer (www.healthy-house.co.uk), offers different types of air purifiers from a range of manufacturers. Air purifiers either remove or destroy pollutants, depending on the technology used and whether they are mechanical air filters or electronic air cleaners EPA (2017a). Another technology that can be used comes in the form of air quality apps that do not directly prevent or control pollution but make pollution visible to individuals who can change their behaviour accordingly (Delmas and Kohli 2019).
Long-term filter efficiency of mobile air purifiers in schools
Published in Aerosol Science and Technology, 2023
Manuel Granzin, Sarah Richter, Jann Schrod, Natalie Schubert, Joachim Curtius
Air purifiers can be a suitable additional measure to lower the infection risk during classes. Especially throughout the winter months, the use of air purifiers may compensate for the lack of dilution via ventilation as the time periods between venting events may increase. Air purifiers have been used for many years and it is well known that they are able to reduce the number concentration of aerosol particles reliably and substantially in a room (Offermann et al. 1985; Shaughnessy and Sextro 2006; Curtius, Granzin, and Schrod 2021), which simultaneously lowers the potential virus-load. Air purifiers remove particulate matter from the room air by drawing it through a High-Efficiency Particulate Air (HEPA) filter. The higher the flow rate through the filter, the faster the particle load can be reduced. Some schools in Germany were able to obtain air purifiers for each classroom at the beginning of the second SARS-CoV-2 infection wave (November 2020). Since these air purifiers were usually used for 5–10 h per day, the question arises if the filtration efficiency is affected by the long-term use over the course of a semester.
Efficacy of aerosol reduction measures for dental aerosol generating procedures
Published in Aerosol Science and Technology, 2022
Zixin He, Qiman Gao, Anna Henley, Zovinar Der Khatchadourian, Wendy Somerville, Michael Wiseman, Luc Mongeau, Faleh Tamimi
The air purifier provided a reduction rate of 94.8 (93.8–95.1)% for aerosol produced during the drilling procedure. The combination of a HVE and an air purifier reached an aerosol reduction rate of 99.6 (99.4–99.8)%. A few studies have concluded that air purifiers are effective as a tool for localized infection control in residential and hospital settings (Boswell and Fox 2006; Mousavi et al. 2020; Qian et al. 2010; Zuraimi, Nilsson, and Magee 2011). Recent studies also reports their effectiveness in a school setting (Curtius, Granzin, and Schrod 2021) and a dental setting (Ren et al. 2021).The present results support a similar conclusion.