摘要 本研究目的為評估奈米碳管空氣負離子產生裝置在連續處理的狀況下對所選用的四種生物氣膠物種:E.coli、B.subtilis、C.famata、P.citrinum之控制效率,以了解空氣負離子對不同生物氣膠物種在控制效率上的差異性,並比較以沾附奈米碳管之不鏽鋼針尖與傳統不鏽鋼針尖放電產生空氣負離子對生物氣膠的控制效率上有何異同,並於不同相對濕度的條件下進行實驗,以了解相對濕度對空氣負離子控制生物氣膠的影響。 研究結果發現,沾附奈米碳管之不鏽鋼針尖可以在較低的放電電壓下即開始產生出高於室內濃度背景值的空氣負離子,但其所產生空氣負離子之濃度隨時間是呈現出不穩定且衰減的趨勢。增加不鏽鋼針尖產生空氣負離子之放電電壓,對其控制生物氣膠之效率會有明顯的提升;增加沾附奈米碳管之不鏽鋼針尖產生空氣負離子之放電電壓,對其控制生物氣膠之效率提升性則較不顯著。以不鏽鋼針尖在放電電壓為2.8kV與沾附奈米碳管之不鏽鋼針尖在放電電壓為1.8kV之下產生空氣負離子對本研究所選定的四種生物氣膠之控制效率由大到小為ηB.Subtilis ≒ηE.Coli > ηYeast ≒ηP.Citrinum.。使用不鏽鋼針尖產生空氣負離子控制生物氣膠時,相對濕度的影響非常重要,較小顆粒生物氣膠(E.Coli及B.Subtilis)而言,都是在RH=50%時有最佳的控制效率出現,而RH=30%時的控制效率比RH=70%時的控制效率好;對於較大顆粒的生物氣膠(Yeast及P.Citrinum)而言,空氣負離子對其控制效率皆是在RH=70%時有最佳控置效率,而使用沾附奈米碳管之不鏽鋼針尖產生空氣負離子控制生物氣膠時,相對濕度的改變對其控制效率的影響不明顯。以不鏽鋼針尖放電電壓2.8kV產生空氣負離子控制生物氣膠,其控制效率隨時間的變化關係大致維持在一個穩定的狀態。以沾附奈米碳管之不鏽鋼針尖放電電壓1.8kV產生空氣負離子對生物氣膠之控制效率是隨時間而呈現出衰減的狀態。
The purpose of this study was to evaluate control efficiency on bioaerosols, including E.coli、B.subtilis、C.famata(Yeast)、P.citrinum, by using negative air ion (NAI) which was produced on carbon nanotubes (CNTs). The effects of relative humidity were investigated in this study. Also, it compared the generation of NAI at a concentration of 7×105-1.2×106 ions cm-3 in experimental chamber (9.32×10-2 m3) by negative electric discharge with different discharge voltage on CNTs needle and conventional stainless steel needle. The results showed that the higher concentration of NAI was produced under lower discharging voltage on CNTs needle, but unstable and the NAI concentration decreased with time compared with stainless steel needle. The control efficiency of bioaerosols increased with discharge voltage of stainless steel needle,but it is not significant on CNTs needle. In general, the order of control efficiency on bioaerosols by NAI is ηB.Subtilis ≒ ηE.Coli > ηYeast ≒ ηP.Citrinum. When NAI generated by stainless steel needle, the best control efficiency of E.coli and B.subtilis were found at RH=50%, and the control efficiency under RH=30% is better than that at RH=70%. The best control efficiency of C.famata(Yeast) and P.citrinum were obtained at RH=70%. However, when the NAI produced by carbon nanotubes needle to control bioaerosols, the effect of RH was not significant. The control efficiency of the bioaerosols on stainless steel needle was stable with time, but decreased for CNTs needle.
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