On-site application of air cleaner emitting plasma ion to reduce airborne contaminants in pig building

Cho, Mansu; Ko, Hang-Ju; Kim, Daekeun; Kim, Ki Youn

doi:10.1016/j.atmosenv.2012.08.049

Cited by 8 publications

(3 citation statements)

References 20 publications

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“…Intriguingly, the TVOC removal ratios in the field test decreased sooner than in the laboratory test. In this case, TSPs were removed by the HEPA filter and electrostatic precipitation in the plasma treatment [12,13]. However, as mentioned in Section 2.4, TVOC removal was easily affected by catalyst poisoning and adsorption/desorption of VOCs on the filters during long-term field use.…”

Section: Resultsmentioning

confidence: 99%

Field Performance Test of an Air-Cleaner with Photocatalysis-Plasma Synergistic Reactors for Practical and Long-Term Use

Ochiai

Ichihashi²,

Nishida³

et al. 2014

Molecules

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A practical and long-term usable air-cleaner based on the synergy of photocatalysis and plasma treatments has been developed. A field test of the air-cleaner was carried out in an office smoking room. The results were compared to previously reported laboratory test results. Even after a treatment of 12,000 cigarettes-worth of tobacco smoke, the air-cleaner maintained high-level air-purification activity (98.9% ± 0.1% and 88% ± 1% removal of the total suspended particulate (TSP) and total volatile organic compound (TVOC) concentrations, respectively) at single-pass conditions. Although the removal ratio of TSP concentrations was 98.6% ± 0.2%, the ratio of TVOC concentrations was 43.8% after a treatment of 21,900

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Section: Resultsmentioning

confidence: 99%

Field Performance Test of an Air-Cleaner with Photocatalysis-Plasma Synergistic Reactors for Practical and Long-Term Use

Ochiai

Ichihashi²,

Nishida³

et al. 2014

Molecules

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“…Treatment of emitted air by biofilters composed of microorganisms developing on an inorganic or organic solid media (e.g., woodchips) were proven effective at reducing culturable bacteria (up to 90% reduction on DG18 agar) but at varying effectiveness depending on the solid media used [28]. Additionally, the application of plasma ions was responsible for some reductions of bioaerosols (22% and 25% for culturable bacteria and fungi on tryptic soy agar) although did not significantly reduce ammonia or hydrogen sulfide [29]. The use of acid scrubbers (e.g., sulfuric acid) to reduce alkaline compounds with acids, resulted as well in the decrease of culturable bacteria (70%) [30].…”

Section: Biofiltration Of Airmentioning

confidence: 99%

Reduction of Bioaerosols Emitted from a Swine Confinement Building by a Percolating Biofilter During a 10-Month Period

et al. 2019

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The release of pathogens into the air from swine confinement buildings are mitigated through preventative measures, such as outgoing air filtration, to reduce the risk of spread to nearby barns and communities. The present study aims to characterize the effectiveness of a percolating biofilter developed by the Research and Development Institute for the Agri-environment (IRDA) to capture airborne contaminants, such as bacteria and viruses emitted from a swine finishing room. Over a 10-month period (summer, fall, and winter), air was sampled upwind and downwind of the biofilter using two wet walled cyclonic samplers. Culture-dependent and molecular biology analyses were used to track changes in microbial concentrations and populations both captured and emitted by the percolating biofilter. Results revealed a minor reduction (median reduction efficiency 14.4%) in culturable bacteria. There was a decrease in total bacteria (qPCR) (75.0%) and other qPCR targeted organisms: archaea (42.1%), coliphages (25.6%), Enterococcus (76.1%), and Escherichia coli (40.9%). The community analyses showed similar bacterial diversity in the air upwind and downwind of the biofilter although more Proteobacteria were present downwind of the unit, likely attributable to the Proteobacteria-rich nutritive solution. Evidence is provided for bioaerosols reduction by a percolating biofilter treating air from a swine fattening-finishing room.

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“…Mechanical ventilation is considered a basic control method to eliminate gaseous ammonia from the inside of livestock production barns [8] to ensure the health of workers and animals [9] and the animal production performance [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Type of Gas-Permeable Membrane in Ammonia Recovery from Air

et al. 2019

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Animal production is one of the largest contributors to ammonia emissions. A project, “Ammonia Trapping”, was designed to recover gaseous ammonia from animal barns in Spain. Laboratory experiments were conducted to select a type of membrane most suitable for gaseous ammonia trapping. Three types of gas-permeable membranes (GPM), all made of expanded polytetrafluoroethylene (ePTFE), but with different diameter (3.0 to 8.6 mm), polymer density (0.45 to 1.09), air permeability (2 to 40 L·min−1·cm2), and porosity (5.6 to 21.8%) were evaluated for their effectiveness to recover gas phase ammonia. The ammonia evolved from a synthetic solution (NH4Cl + NaHCO3 + allylthiourea), and an acidic solution (1 N H2SO4) was used as the ammonia trapping solution. Replicated tests were performed simultaneously during a period of 7 days with a constant flow of acidic solution circulating through the lumen of the tubular membrane. The ammonia recovery yields were higher with the use of membranes of greater diameter and corresponding surface area, but they were not affected by the large differences in material density, porosity, air permeability, and wall thickness in the range evaluated. A higher fluid velocity of the acidic solution significantly increased—approximately 3 times—the mass NH3–N recovered per unit of membrane surface area and time (N-flux), from 1.7 to 5.8 mg N·cm−2·d−1. Therefore, to optimize the effectiveness of GPM system to capture gaseous ammonia, the appropriate velocity of the circulating acidic solution should be an important design consideration.

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On-site application of air cleaner emitting plasma ion to reduce airborne contaminants in pig building

Cited by 8 publications

References 20 publications

Field Performance Test of an Air-Cleaner with Photocatalysis-Plasma Synergistic Reactors for Practical and Long-Term Use

Field Performance Test of an Air-Cleaner with Photocatalysis-Plasma Synergistic Reactors for Practical and Long-Term Use

Reduction of Bioaerosols Emitted from a Swine Confinement Building by a Percolating Biofilter During a 10-Month Period

Effect of the Type of Gas-Permeable Membrane in Ammonia Recovery from Air

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