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Zhenyu Cui – One of the best experts on this subject based on the ideXlab platform.

Stephanie Speck – One of the best experts on this subject based on the ideXlab platform.

  • Impact of UVC-sustained recirculating Air Filtration on Airborne bacteria and dust in a pig facility.
    PloS one, 2019
    Co-Authors: Lisa Eisenlöffel, Tobias Reutter, Uwe Truyen, Matthias Horn, Simon Schlegel, Stephanie Speck
    Abstract:

    High amounts of aerial pollutants like dust and microorganisms can pose serious health hazards to animals and humans. The aim of the current study therefore was, to assess the efficiency of UVC irradiation combined to Air Filtration in reducing Airborne microorganisms at laboratory scale. In a second part, a UVC-combined recirculating Air Filtration module (UVC module) was implemented in a small animal facility in order to assess its improvement of Air quality with regard to Airborne bacteria and dust. Tests at laboratory scale were performed using aerosols of Staphylococcus (S.) aureus, Actinobacillus pleuropneumoniae, porcine parvovirus (PPV) and porcine reproductive and respiratory syndrome virus. We varied relative humidity (RH) to evaluate its effect on UVC irradiation efficiency. In addition, viability of pathogens inside the filter material was determined over up to six months. UVC-combined Air Filtration resulted in a more than 99% reduction of viral and bacterial particles. RH had no influence on UVC efficiency. Viability in the filter matter varied depending on the pathogen used and RH with S. aureus and PPV being most resistant. In our small pig facility consisting of two separated barns, weekly Air measurements were conducted over a period of 13 weeks (10 piglets) and 16 weeks (11 piglets), respectively. Airborne bacterial numbers were significantly lower in the barn equipped with the UVC module compared to the reference barn. On average a reduction to 37% of reference values could be achieved for bacteria, whereas the amount of total dust was reduced to a much lesser extent (i.e. to 78% of reference values). Measures taken in front of and behind the UVC module revealed a reduction of 99.4% for Airborne bacteria and 95.0% for total dust. To conclude, recirculating Air Filtration combined to UVC provided efficient reduction of pathogens at laboratory and experimental scale. The implementation of such devices might improve the overall environmental quality in animal facilities.

  • Impact of different supply Air and recirculating Air Filtration systems on stable climate, animal health, and performance of fattening pigs in a commercial pig farm
    PloS one, 2018
    Co-Authors: Cindy Wenke, Janina Pospiech, Tobias Reutter, Bettina Altmann, Uwe Truyen, Stephanie Speck
    Abstract:

    Biosecurity is defined as the implementation of measures that reduce the risk of disease agents being introduced and/or spread. For pig production, several of these measures are routinely implemented (e.g. cleaning, disinfection, segregation). However, Air as a potential vector of pathogens has long been disregarded. Filters for incoming and recirculating Air were installed into an already existing ventilation plant at a fattening piggery (3,840 pigs at maximum) in Saxony, Germany. Over a period of three consecutive fattening periods, we evaluated various parameters including Air quality indices, environmental and operating parameters, and pig performance. Animal data regarding respiratory diseases, presence of antibodies against influenza A viruses, PRRSV, and Actinobacillus pleuropneumoniae and lung health score at slaughter were recorded, additionally. There were no significant differences (p = 0.824) in total bacterial counts between barns with and without Air Filtration. Recirculating Air Filtration resulted in the lowest total dust concentration (0.12 mg/m3) and lung health was best in animals from the barn equipped with recirculating Air Filtration modules. However, there was no difference in animal performance. Antibodies against all above mentioned pathogens were detected but mostly animals were already antibody-positive at re-stocking. We demonstrated that supply Air Filtration as well as recirculating Air Filtration technique can easily be implemented in an already existing ventilation system and that recirculating Air Filtration resulted in enhanced lung health compared to supply Air-filtered and non-filtered barns. A more prominent effect might have been obtained in a breeding facility because of the longer life span of sows and a higher biosecurity level with Air Filtration as an add-on measure.

Werner E. Bischoff – One of the best experts on this subject based on the ideXlab platform.

Zhen Wang – One of the best experts on this subject based on the ideXlab platform.

  • antibacterial and environmentally friendly chitosan polyvinyl alcohol blend membranes for Air Filtration
    Carbohydrate Polymers, 2018
    Co-Authors: Zhen Wang, Feng Yan, Hongchang Pei, Zhenyu Cui
    Abstract:

    Abstract An antibacterial and environmentally friendly chitosan (CS) /polyvinyl alcohol (PVA) blend membrane for Air Filtration was prepared via nonsolvent induced phase separation (NIPS) method. The chemical structure, thermal behavior, morphology, mechanical property and surface charge of the resultant CS/PVA membranes were characterized. Results showed that CS and PVA were miscible due to the intermolecular hydrogen bond between them. The blend membrane obtained from over 20 wt.% CS concentration exhibited a gradient interconnected porous structure without skin layer. The Air Filtration efficiency and pressure drop obtained from CS/PVA membrane with 30 wt.% CS concentration and the thickness of 37 μm under a face velocity of 5.3 cm s−1 were 95.59% and 633.5 Pa, respectively. The performance of Air Filtration obtained is mainly attributed to the direct interception of membrane surface. Further, the antibacterial rate of the blend membrane was up to 94.8% for E. coli and 91.3% for S. aureus.

  • Antibacterial and environmentally friendly chitosan/polyvinyl alcohol blend membranes for Air Filtration.
    Carbohydrate polymers, 2018
    Co-Authors: Zhen Wang, Feng Yan, Hongchang Pei, Zhenyu Cui
    Abstract:

    Abstract An antibacterial and environmentally friendly chitosan (CS) /polyvinyl alcohol (PVA) blend membrane for Air Filtration was prepared via nonsolvent induced phase separation (NIPS) method. The chemical structure, thermal behavior, morphology, mechanical property and surface charge of the resultant CS/PVA membranes were characterized. Results showed that CS and PVA were miscible due to the intermolecular hydrogen bond between them. The blend membrane obtained from over 20 wt.% CS concentration exhibited a gradient interconnected porous structure without skin layer. The Air Filtration efficiency and pressure drop obtained from CS/PVA membrane with 30 wt.% CS concentration and the thickness of 37 μm under a face velocity of 5.3 cm s−1 were 95.59% and 633.5 Pa, respectively. The performance of Air Filtration obtained is mainly attributed to the direct interception of membrane surface. Further, the antibacterial rate of the blend membrane was up to 94.8% for E. coli and 91.3% for S. aureus.

Hongchang Pei – One of the best experts on this subject based on the ideXlab platform.

  • antibacterial and environmentally friendly chitosan polyvinyl alcohol blend membranes for Air Filtration
    Carbohydrate Polymers, 2018
    Co-Authors: Zhen Wang, Feng Yan, Hongchang Pei, Zhenyu Cui
    Abstract:

    Abstract An antibacterial and environmentally friendly chitosan (CS) /polyvinyl alcohol (PVA) blend membrane for Air Filtration was prepared via nonsolvent induced phase separation (NIPS) method. The chemical structure, thermal behavior, morphology, mechanical property and surface charge of the resultant CS/PVA membranes were characterized. Results showed that CS and PVA were miscible due to the intermolecular hydrogen bond between them. The blend membrane obtained from over 20 wt.% CS concentration exhibited a gradient interconnected porous structure without skin layer. The Air Filtration efficiency and pressure drop obtained from CS/PVA membrane with 30 wt.% CS concentration and the thickness of 37 μm under a face velocity of 5.3 cm s−1 were 95.59% and 633.5 Pa, respectively. The performance of Air Filtration obtained is mainly attributed to the direct interception of membrane surface. Further, the antibacterial rate of the blend membrane was up to 94.8% for E. coli and 91.3% for S. aureus.

  • Antibacterial and environmentally friendly chitosan/polyvinyl alcohol blend membranes for Air Filtration.
    Carbohydrate polymers, 2018
    Co-Authors: Zhen Wang, Feng Yan, Hongchang Pei, Zhenyu Cui
    Abstract:

    Abstract An antibacterial and environmentally friendly chitosan (CS) /polyvinyl alcohol (PVA) blend membrane for Air Filtration was prepared via nonsolvent induced phase separation (NIPS) method. The chemical structure, thermal behavior, morphology, mechanical property and surface charge of the resultant CS/PVA membranes were characterized. Results showed that CS and PVA were miscible due to the intermolecular hydrogen bond between them. The blend membrane obtained from over 20 wt.% CS concentration exhibited a gradient interconnected porous structure without skin layer. The Air Filtration efficiency and pressure drop obtained from CS/PVA membrane with 30 wt.% CS concentration and the thickness of 37 μm under a face velocity of 5.3 cm s−1 were 95.59% and 633.5 Pa, respectively. The performance of Air Filtration obtained is mainly attributed to the direct interception of membrane surface. Further, the antibacterial rate of the blend membrane was up to 94.8% for E. coli and 91.3% for S. aureus.