Conditions and rates of biotic and abiotic iron precipitation in selected Danish freshwater plants and microscopic analysis of precipitate morphology
Conditions and rates of biotic and abiotic iron precipitation in selected Danish freshwater plants and microscopic analysis of precipitate morphology
复制标题
选定的丹麦淡水植物中生物和非生物铁沉淀的条件和速率以及沉淀物形态的微观分析
DOI：
10.1016/s0043-1354(00)00002-6
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发表时间：
2000
期刊：
影响因子：
12.8
通讯作者：
J. Abraham‐Peskir
中科院分区：
文献类型：
--
作者：
E. Søgaard;R. Medenwaldt;J. Abraham‐Peskir
本研究比较了丹麦同一地区的新型淡水工厂 Astrup 的砂滤器中铁的生物沉淀与传统淡水工厂 Forum 的砂滤器中铁的非生物沉淀。我们观察到，第三个淡水厂 Grindsted 原本计划以传统的非生物方式沉淀铁，但由于原水通气不良和含氧量极低，实际上正在生物沉淀铁。在 Astrup 和 Grindsted 中，主要的铁沉淀细菌是 Gallionella ferruginea。使用光、X射线、扫描电子显微镜和透射电子显微镜研究了铁沉淀物的形态。还研究了控制沉淀和沉淀铁污泥的物理化学条件。尽管该过程的物理化学条件要差得多，但生物沉淀铁的氧化和沉淀速度比传统非生物过程快约 60 倍。更快的动力学表明由于存在来自 Gallionella ferruginea 的外聚合物而具有催化活性。提出了铁沉淀物特性差异与沉淀动力学之间关系的模型。
This study compares the biotic precipitation of iron in the sand filters of a new freshwater plant, Astrup, with the abiotic precipitation of iron in the sand filters of a traditional freshwater plant, Forum, in the same area of Denmark. We have observed that a third freshwater plant, Grindsted, which was planned to precipitate iron in the traditional abiotic way is in fact precipitating iron biotically because of poor aeration and very low oxygen content of the raw water. The dominant iron-precipitating bacteria was Gallionella ferruginea in both Astrup and Grindsted. The morphology of the iron precipitates were investigated using light, X-ray, scanning electron and transmission electron microscopy. The physicochemical conditions governing precipitation and the precipitated iron sludge were also investigated. The biotically precipitated iron was shown to be oxidised and precipitated with a rate about 60 times faster than the traditional abiotic process in spite of the much poorer physicochemical conditions for the process. The faster kinetics indicate a catalytic activity due to the presence of exopolymers from Gallionella ferruginea. A model is proposed for the relationship between the differences in characteristics of the iron precipitate and the kinetics of the precipitation.