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首页> 美国卫生研究院文献>Applied and Environmental Microbiology >The Bacterivorous Soil Flagellate Heteromita globosa Reduces Bacterial Clogging under Denitrifying Conditions in Sand-Filled Aquifer Columns
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The Bacterivorous Soil Flagellate Heteromita globosa Reduces Bacterial Clogging under Denitrifying Conditions in Sand-Filled Aquifer Columns

机译：在反硝化条件下填砂含水层柱中的细菌食性鞭毛杂种Hlobomita globosa减少了细菌的堵塞

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An exopolymer (slime)-producing soil bacterium Pseudomonas sp. (strain PS+) rapidly clogged sand-filled columns supplied with air-saturated artificial groundwater containing glucose (500 mg liter−1) as a sole carbon source and nitrate (300 mg liter−1) as an alternative electron acceptor. After 80 days of operation under denitrifying conditions, the effective porosity and saturated hydraulic conductivity (permeability) of sand in these columns had fallen by 2.5- and 26-fold, respectively. Bacterial biofilms appeared to induce clogging by occluding pore spaces with secreted exopolymer, although there may also have been a contribution from biogas generated during denitrification. The bacterivorous soil flagellate Heteromita globosa minimized reductions in effective porosity (1.6-fold) and permeability (13-fold), presumably due to grazing control of biofilms. Grazing may have limited growth of bacterial biomass and hence the rate of exopolymer and biogas secretion into pore spaces. Evidence for reduction in biogas production is suggested by increased nitrite efflux from columns containing flagellates, without a concomitant increase in nitrate consumption. There was no evidence that flagellates could improve flow conditions if added once clogging had occurred (60 days). Presumably, bacterial biofilms and their secretions were well established at that time. Nevertheless, this study provides evidence that bacterivorous flagellates may play a positive role in maintaining permeability in aquifers undergoing remediation treatments.
机译：产生外聚合物（粘液）的土壤细菌假单胞菌（Pseudomonas sp。）。 （PS +应变）快速填充的充满空气的人工地下水（包含葡萄糖（500 mg升 -1 ）作为唯一的碳源和硝酸盐（300 mg升 -1 / sup>）作为替代电子受体。在反硝化条件下运行80天后，这些塔中沙子的有效孔隙率和饱和水力传导率（渗透率）分别下降了2.5倍和26倍。尽管反硝化过程中产生的沼气也有贡献，但细菌生物膜似乎通过分泌的外聚物阻塞孔空间而引起堵塞。细菌性土壤鞭毛杂种Heteromita globosa最小化了有效孔隙率（1.6倍）和渗透率（13倍）的降低，这大概是由于对生物膜的放牧控制所致。放牧可能会限制细菌生物量的生长，从而限制外聚合物和沼气向孔隙空间分泌的速率。从含有鞭毛酸盐的色谱柱中亚硝酸盐外排量增加，而硝酸盐消耗量却没有随之增加，表明了沼气产量减少的证据。没有证据表明，一旦发生堵塞（60天），添加鞭毛可以改善血流状况。据推测，细菌生物膜及其分泌物在那时已经很成熟。但是，这项研究提供了证据，即细菌鞭毛可能在维持接受补救处理的含水层中的渗透性方面发挥积极作用。

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