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Effects of aerobic–anaerobic transient conditions on sulfur and metal cycles in sewer biofilms

机译：好氧厌氧条件对下水道生物膜中硫和金属循环的影响

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摘要

Interactions between sulfur and metals were studied in aerobic and anaerobic biofilms grown on domestic waste water at 15°C. The dominant metals in the waste water were iron, zinc and copper, which were present in average concentrations of 0.5mg/l, 0.6mg/l and 0.1m/l, respectively. Copper and zinc were found to accumulate in the anaerobic biofilm owing to precipitation of metal sulfides. Iron supplementation (approximately 5.5mg Fe/l) to the anaerobic waste water reduced the zinc and copper precipitation due to sulfide precipitation with iron. However, even at these elevated iron concentrations in the waste water, sulfide precipitation in the biofilm was controlled largely by zinc and copper. In the aerobic biofilm, addition of iron resulted in accumulation of iron and phosphate, probably owing to precipitation of iron phosphates and iron (oxy)hydroxides. The potential importance of extracellular polymeric substances (EPS) on metal sorption in sewer biofilms was studied. EPS consisted mainly of proteins (13–260mg/(g volatile solids)) and to a lesser extent of carbohydrates (8–26mg/(g volatile solids)). The EPS composition remained relatively constant during experimental runs, but differed significantly between them. No relationships between the metal content of the biofilm and the amount of extracted EPS were found, which suggests that EPS did not play a major role in the metal accumulation.
机译：研究了在15°C的生活污水上生长的需氧和厌氧生物膜中硫与金属之间的相互作用。废水中的主要金属是铁，锌和铜，它们的平均浓度分别为0.5mg / l，0.6mg / l和0.1m / l。由于金属硫化物的沉淀，发现铜和锌在厌氧生物膜中积累。由于厌氧废水中铁的硫化物沉淀，因此向厌氧废水中补充铁（约5.5mg Fe / l）可减少锌和铜的沉淀。然而，即使在废水中铁浓度升高的情况下，生物膜中的硫化物沉淀也很大程度上受锌和铜的控制。在好氧生物膜中，铁的添加导致铁和磷酸盐的积累，这可能是由于磷酸铁和氢氧化铁（氧）的沉淀所致。研究了细胞外聚合物（EPS）对下水道生物膜中金属吸附的潜在重要性。 EPS主要由蛋白质（13–260mg /（g挥发性固体））和较少量的碳水化合物（8–26mg /（g挥发性固体）组成。在实验过程中，EPS的组成保持相对恒定，但两者之间却存在显着差异。在生物膜的金属含量和提取的EPS量之间未发现任何关系，这表明EPS在金属积累中没有发挥主要作用。

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