Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Università di Palermo, Viale delle Scienze, 90128 Palermo, Italy.
Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Università di Palermo, Viale delle Scienze, 90128 Palermo, Italy.
Bioresour Technol. 2017 Apr;229:152-159. doi: 10.1016/j.biortech.2017.01.024. Epub 2017 Jan 13.
The modification of the physical properties of aerobic granular sludge treating fish-canning wastewater is discussed in this paper. The structure and composition of the Extracellular Polymeric Substances (EPSs) were analyzed at different salinity levels and related to granules stability. Results outlined that the total EPSs content increased with salinity, despite the EPSs increment was not proportional to the salt concentration. Moreover, the EPSs structure was significantly modified by salinity, leading to a gradual increase of the not-bound EPSs fraction, which was close to the 50% of the total EPSs content at 75gNaClL. The increasing salt concentration modified also the EPSs composition, causing the gradual reduction of protein content resulting in a decrease of granule hydrophobicity. The results pointed out that the granules stability significantly reduced above 50gNaClL, suggesting the existence of a salinity threshold above which granules stability is compromised.
本文探讨了在不同盐度下处理鱼罐头废水的好氧颗粒污泥的物理性质的变化。分析了胞外聚合物（EPS）的结构和组成，并将其与颗粒稳定性相关联。结果表明，尽管 EPS 的增加与盐浓度不成比例，但总 EPS 含量随盐度的增加而增加。此外，盐度显著改变了 EPS 的结构，导致非结合 EPS 部分逐渐增加，在 75gNaClL 时接近总 EPS 含量的 50%。增加盐浓度还改变了 EPS 的组成，导致蛋白质含量逐渐减少，颗粒疏水性降低。结果表明，当盐度超过 50gNaClL 时，颗粒的稳定性显著降低，这表明存在一个盐度阈值，超过该阈值颗粒的稳定性就会受到影响。
