Deflocculation of activated sludge by the dissimilatory Fe(III)-reducing bacterium Shewanella alga BrY
Deflocculation of activated sludge by the dissimilatory Fe(III)-reducing bacterium Shewanella alga BrY
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DOI：
10.1128/aem.62.4.1487-1490.1996
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发表时间：
1996-04-01
影响因子：
4.4
通讯作者：
Nielsen, PH
中科院分区：
文献类型：
--
作者：
Caccavo, F;Frolund, B;Nielsen, PH
研究了微生物Fe(III)还原对高压灭菌活性污泥絮凝效果的影响。Fe(III)对活性污泥的絮凝效果优于Fe(II)。随着Fe(III)浓度的降低，污泥的总浊度增加，而总浊度在一定范围内保持相对恒定。异化金属还原细菌希瓦氏藻Bry的细胞将H-2的氧化与污泥絮体中结合的Fe(III)的还原偶联。细胞与Fe(III)-污泥絮体的黏附是Fe(III)还原的先决条件。菌株Bry对污泥絮体中的Fe(III)的还原导致了原水浊度的增加，说明污泥被解聚。这项研究的结果支持了以前的研究，即微生物的Fe(III)呼吸作用可能对活性污泥的逃逸结构和胶体化学产生影响。
The influence of microbial Fe(III) reduction on the deflocculation of autoclaved activated sludge was investigated. Fe(III) flocculated activated sludge better than Fe(II). Decreasing concentrations of Fe(III) caused an increase in sludge bulk water turbidity, while bulk water turbidity remained relatively constant over a range of Fe(II) concentrations. Cells of the dissimilatory metal-reducing bacterium Shewanella alga BrY coupled the oxidation of H-2 to the reduction of Fe(III) bound in sludge flocs. Cell adhesion to the Fe(III)-sludge flocs was a prerequisite for Fe(III) reduction. The reduction of Fe(III) in sludge flocs by strain BrY caused an increase in bulk water turbidity, suggesting that the sludge was deflocculated. The results of this study support previous research suggesting that microbial Fe(III) respiration may have an impact on the flee structure and colloidal chemistry of activated sludge.