氧化鋅、銀、鐵奈米微粒對生物除磷之影響

Impacts of ZnO, Ag, Fe nanoparticles on biological phosphorus removals.

洪珮珊(Pei-Shan Hung)

指導教授 ： 蔡勇斌

國立暨南國際大學/科技學院/土木工程學系/碩士(2013年)

摘要

本研究探討三種不同奈米金屬微粒（奈米氧化鋅、奈米銀及奈米四氧化三鐵），對活性污泥除磷機制之影響。實驗結果顯示，奈米氧化鋅濃度達2 mgl-1已完全抑制磷蓄積菌之除磷能力；奈米銀達10 mgl-1 時除磷能力僅剩7%；奈米四氧化三鐵濃度達100 mgl-1 始抑制除磷。
統計檢定結果顯示，添加三種奈米金屬對於磷蓄積菌之比攝磷率、PHAs合成/分解率及肝醣分解/合成率皆有顯著影響，且對好氧代謝的影響較厭氧代謝明顯，其抑制程度為奈米氧化鋅>奈米銀≥奈米四氧化三鐵。研究亦發現奈米金屬顆粒對除磷的影響，主要來自金屬離子的釋出及活性氧化物種 (Reactive Oxygen Species, ROS)的生成，其釋出量與生成量隨奈米金屬濃度增加而增加。

關鍵字

奈米銀 ； 奈米氧化鐵 ； 奈米氧化鋅 ； 生物除磷系統 ； 活性氧化物質

並列摘要

This study explored the impacts of ZnO, Ag, Fe nanoparticles on biological phosphorus removal. Experimental results showed that the phosphorus removal ability of phosphorus accumulating organism (PAO) was completely inhibited when ZnO nanoparticle concentration was 2 mgl-1. Only 7% removal ability remained when Ag nanoparticle concentration was 10 mgl-1. The phosphorus removal ability of PAO was initially inhibited at 100 mgl-1 concentration of Fe nanoparticle
Statistical analysis showed that the three kinds of nanoparticles significantly affected the PAO’s metabolisms, including phosphorus uptake, PHA synthesis/degradation, and glycogen degradation/synthesis. The influence of nanoparticles was greater at aerobic phase than at anaerobic phase. The order of the inhibition degree of nanoparticles for PAO was ZnO>Ag>Fe3O4. This study also found that the influence of nanoparticles on PAO’s metabolisms mainly resulted from the release of ionic metals and the formation of reactive oxidation species (ROS). The concentration of ionic metals and ROS increased with increasing nanoparticle concentration.

並列關鍵字

Ag nanoparticle ； Fe3O4 nanoparticle ； ZnO nanoparticle ； biological phosphorus removal ； reactive oxidation species

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