不同价态铁元素对厌氧微生物降解2,4,6-三氯酚的影响  

Effects of different valence forms of iron on 2,4,6-trichlorophenol degradation by anaerobic microorganism

作　　者：汪桂芝[1] 戴友芝[1] 龚敏[1] 杨双[1] 万丽[1] 

机构地区：[1]湘潭大学环境科学与工程系,湖南湘潭411105

出　　处：《微生物学通报》2013年第12期2196-2202,共7页Microbiology China

基　　金：国家自然科学基金项目(No.20977072)

摘　　要：【目的】考察初始pH值为5.0 10.0时,不同价态铁元素(Fe0、Fe2+和Fe3+)对厌氧微生物降解2,4,6-三氯酚(2,4,6-TCP)的影响。【方法】采用间歇试验,接种驯化3个月的厌氧污泥,向其中分别投加Fe0、Fe2+和Fe3+,测定体系中2,4,6-TCP浓度、pH值、铁离子浓度和微生物脱氢酶活性。【结果】"Fe0/Fe2+/Fe3+-微生物"体系对2,4,6-TCP的降解效率,在初始pH值为中性偏酸性时,"Fe2+-微生物"体系>"Fe0-微生物"体系>"Fe3+-微生物"体系;而当初始pH值为碱性时,"Fe0-微生物"体系>"Fe2+-微生物"体系>"Fe3+-微生物"体系;"Fe0/Fe2+/Fe3+-微生物"三种体系均有调节pH值的能力,其中"Fe0-微生物"体系调节能力最强;在不同初始pH值条件下不同价态铁元素对厌氧微生物活性的影响结果与其对2,4,6-TCP降解效果的影响规律基本相同。【结论】不同价态铁元素对厌氧微生物降解2,4,6-TCP的影响与初始pH值、体系实时pH值和铁元素价态及浓度等因素有关。[Objective] In the condition of initial pH ranging from 5.0-10.0, the influence of different valence forms of iron （Fe^0, Fe2^＋ and Fe3^＋） on 2,4,6-trichlorophenol （2,4,6-TCP） deg- radation by anaerobic microorganism was studied. [Methods] A batch test in the laboratory was conducted by the addition of Fe^0, Fe2^＋ or Fe3^＋ in the anaerobic system, through inoculating the anaerobic mixed microorganism acclimated for three months. 2,4,6-TCP concentration, pH value, iron ion concentration and microbial dehydrogenase activity was measured. ]Results] When the initial pH value is neutral or acidic, the Fe2＊-microorganism system could exert an accelerative effect on the 2,4,6-TCP degradation than the others, while the initial pH value is alkalic, the ＂Fe^0-microorganism＇＇ system has better performances on the 2,4,6-TCP degradation than the others; each of the ＂Fe^0/Fe2^＋/Fe3＊-microorganism＂ system has the ability to adjust pH, furthermore, the ＂Fe^0-microorganism＇＇ system performs better; in the condition of different initial pH values, the influence of different valence iron on anaerobic microbial activity and 2,4,6-TCP degradation are the same. [Conclusion] The influence of different valence forms of iron on 2,4,6-TCP degradation by anaerobic microorganism is related to the factors such as initial pH value, real-time pH value, iron valence and its concentration.

关 键 词：不同价态铁元素 2 4 6-三氯酚 厌氧微生物 废水处理 

分 类 号：X172[环境科学与工程—环境科学]