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標題: | 自營氫細菌與零價鎳金屬結合去除三氯乙烯
之研究 The study of TCE remove by autotrophic hydrogen-bacteria combined with zero-valence nickel |
作者: | Min-Fei Tu 杜旻霏 |
指導教授: | 曾四恭 |
關鍵字: | 三氯乙烯,氫細菌,鎳金屬,還原脫氯, TCE,hydrogen bacteria,nickel,reductive dechlorination, |
出版年 : | 2005 |
學位: | 碩士 |
摘要: | 含氯有機化合物被廣泛使用於工業中,但常因處理或儲存不當而污染土壤及地下水,其中三氯乙烯為污染場址中最常見且含量最高之污染物,而傳統之生物及物化處理方法各具有其優缺點,若要改善各方法之缺失,其中一種可能之方式為將生物及物化方法結合,故本研究擬試以將具有還原脫氯能力之菌種與零價金屬合併處理三氯乙烯。
試驗分別以氫自營菌、零價鎳金屬及兩者合併等三種方法進行三氯乙烯之處理,並提供氫氣做作為電子供給者。結果顯示提供氫氣能增進生物之脫氯反應,將三氯乙烯完全脫氯為烷類,無含氯之中間產物生成;亦能增加零價金屬之還原反應速率,降解速率隨金屬添加量而增加;氫氣亦可減少金屬離子之解離,解離量約為沒有氫氣條件下之0.4倍,唯缺點為仍有少量氯乙烯之累積。 生物及金屬兩者合併後在本批次實驗條件下對三氯乙烯之脫氯速率較金屬及氫自營菌個別脫氯要快,但由於氫細菌與零價金屬同時利用氫氣,造成氫氣供應量不足,因此反應速率與零價鎳金屬差異不大;鎳金屬所產生之氯乙烯有再被生物脫氯之現象,可見兩者合併後對脫氯效果具有加成作用。但本批次試驗之缺點為反應受到氫氣供應量不足之限制,所增加之績效不大。 以固定化技術將零價金屬包埋為顆粒狀,在微量金屬包埋後對三氯乙烯仍具有脫氯之效果,故金屬之包埋在未來進行連續流試驗時具有可行性。 Chlorinated organic compounds are widely used in industrial process and one of the most common and critical contaminant is known as Trichloroethylene (TCE), which contaminated soil and groundwater easily due to inappropriate treatment or storage. Recently, many researches were made to investigate practicable methods for TCE removing via biological, physical or chemical process, however, few were considered to be both effective and economic. This research is to develop a more practicable and feasible method for TCE treatment with a combined biological and chemical process based on synergetic dechlorination reactions by microorganisms and zero-valent metals. The experiments were carried out by using a combined zero-valent nickel and autotrophic hydrogen-bacteria system and compared with individual systems. The results suggest that hydrogen provided promote biological dechlorination in the individually biological system, TCE was dechlorinated to alkanes completely with no chlorinated intermediates were detected. In zero-valent metal systems, the dechlorination rate was proportional to the amount of metal added, also, supplying of hydrogen gas increased reaction rate possibly by suppressing the ionization of zero-valent metals (60% decrease in ionic form), however, trace-amount accumulation of chloroethylene was observed. Dechlorination rate of TCE by combined biological and zero-valent metal process was higher than individual ones, further dechlorination of chloroethylene also demonstrated synergetic effects by this combined system, however, the biological system showed limited enhancement which may caused by insufficient effectiveness of hydrogen gas supply. The PVA-alginic acid immobilized zero-valance nickel still had the dechlorination ability, so the immobilized zero-valance nickel can do the further research in the continue flow test. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/35941 |
全文授權: | 有償授權 |
顯示於系所單位: | 環境工程學研究所 |
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