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首页> 外文会议>Biological treatment symposium 2013 >Effect of Phosphorus Limitation on the Production of Extracellular Polymeric Substances (EPS) by Drinking-Water Bacteria
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Effect of Phosphorus Limitation on the Production of Extracellular Polymeric Substances (EPS) by Drinking-Water Bacteria

机译：磷限制对饮用水细菌产生细胞外聚合物的影响

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摘要

The drinking-water industry is increasingly interested in the optimization of biofiltration. The control of extracellular polymeric substances (EPS) in biofilters might be one such area for optimization. Heterotrophic bacteria are often cited as requiring a carbon:nitrogen:phosphorus (C:N:P) molar ratio of 100:10:1 for growth. However, the literature documents increased production of EPS when the nitrogen and/or phosphorus concentrations are limiting. If nitrogen or phosphorus limitation leads to increased EPS production, this could lead to increased headloss in a biofilter. Consequently, increased headloss will translate to increased backwash frequency and energy consumption. The goal of the current work was to examine EPS production by drinking-water bacteria under balanced nutrient conditions (C:N:P of 100:10:1) and nutrient-limited conditions. The pilot-scale data show that exopolysaccharides in the EPS decreased substantially in the phosphorus-supplemented biofilter as compared to the phosphorus-limited biofilter. The pilot-scale data also showed that phosphorus addition caused a significant change in the microbial community composition. Batch experiments, inoculated with a mixed community of drinking-water bacteria, demonstrated increased production of exopolysaccharides in the EPS (normalized to bacterial biomass) under nitrogen- and phosphorus-limited conditions.
机译：饮用水行业对生物过滤的优化越来越感兴趣。生物过滤器中细胞外聚合物质（EPS）的控制可能是此类优化领域之一。经常提到异养细菌生长需要碳：氮：磷（C：N：P）摩尔比为100：10：1。然而，当氮和/或磷的浓度受到限制时，文献记载了EPS的产量增加。如果氮或磷的限制导致EPS产量增加，则可能导致生物滤池的水头损失增加。因此，水头损失的增加将转化为反洗频率和能量消耗的增加。当前工作的目标是在营养平衡的条件下（C：N：P为100：10：1）和营养受限的条件下，检查饮用水细菌产生的EPS。中试规模数据显示，与磷受限的生物滤池相比，在补充磷的生物滤池中EPS中的胞外多糖显着减少。中试规模的数据还表明，磷的添加引起了微生物群落组成的重大变化。用饮用水细菌的混合群落接种的分批实验表明，在氮和磷受限的条件下，EPS中胞外多糖的产量增加（标准化为细菌生物量）。

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