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首页> 外文期刊>Geosciences >The Impact of Biofilms upon Surfaces Relevant to an Intermediate Level Radioactive Waste Geological Disposal Facility under Simulated Near-Field Conditions
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The Impact of Biofilms upon Surfaces Relevant to an Intermediate Level Radioactive Waste Geological Disposal Facility under Simulated Near-Field Conditions

机译：模拟近场条件下生物膜对与中级放射性废物地质处置设施有关的表面的影响

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The ability of biofilms to form on a range of materials (cementious backfill (Nirex Reference Vault Backfill (NRVB)), graphite, and stainless steel) relevant to potential UK intermediate level radioactive waste (ILW) disposal concepts was investigated by exposing these surfaces to alkaliphilic flocs generated by mature biofilm communities. Flocs are aggregates of biofilm material that are able to act as a transport vector for the propagation of biofilms. In systems where biofilm formation was observed there was also a decrease in the sorption of isosaccharinic acids to the NRVB. The biofilms were composed of cells, extracellular DNA (eDNA), proteins, and lipids with a smaller polysaccharide fraction, which was biased towards mannopyranosyl linked carbohydrates. The same trend was seen with the graphite and stainless steel surfaces at these pH values, but in this case the biofilms associated with the stainless steel surfaces had a distinct eDNA basal layer that anchored the biofilm to the surface. At pH 13, no structured biofilm was observed, rather all the surfaces accumulated an indistinct organic layer composed of biofilm materials. This was particularly the case for the stainless steel coupons which accumulated relatively large quantities of eDNA. The results demonstrate that there is the potential for biofilm formation in an ILW-GDF provided an initiation source for the microbial biofilm is present. They also suggest that even when conditions are too harsh for biofilm formation, exposed surfaces may accumulate organic material such as eDNA.
机译：通过将这些表面暴露于英国中级放射性废物（ILW）处置概念，研究了生物膜在与潜在的英国中级放射性废物（ILW）处理概念相关的一系列材料（水泥回填（Nirex参考金库回填（NRVB），石墨和不锈钢）上形成的能力。成熟的生物膜群落产生的嗜碱絮凝物。絮状物是生物膜材料的聚集体，能够充当生物膜繁殖的运输载体。在观察到生物膜形成的系统中，异糖精酸对NRVB的吸附也有所减少。生物膜由细胞，细胞外DNA（eDNA），蛋白质和具有较小多糖部分的脂质组成，其偏向于甘露吡喃糖基连接的碳水化合物。在这些pH值下，石墨和不锈钢表面也观察到了相同的趋势，但是在这种情况下，与不锈钢表面相关的生物膜具有独特的eDNA基础层，将生物膜锚定在表面上。在pH 13时，未观察到结构化的生物膜，而是所有表面都积聚了由生物膜材料组成的模糊有机层。对于累积有大量eDNA的不锈钢试样，情况尤其如此。结果表明，如果存在微生物生物膜的起始来源，则在ILW-GDF中存在生物膜形成的潜力。他们还建议，即使条件对于生物膜形成而言过于苛刻，暴露的表面也可能会积聚有机物质，例如eDNA。

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