Vachoud L, Ruiz E, Delalonde M, Wisniewski C
a UMR QualiSud, UFR des Sciences Pharmaceutiques et Biologiques , Université de Montpellier , Montpellier Cedex 5 , France.
Environ Technol. 2019 Jan;40(1):60-71. doi: 10.1080/09593330.2017.1378729. Epub 2017 Sep 25.
Although the role of the solids concentration on the rheological characteristics of sludge is greatly documented in the literature, few studies focused on the impact of the nature of these solids. How the nature of solutes can modify the solid-liquid interactions and thus the rheological properties of the sludge are also slightly explored. Thus, the objective of this study is to investigate the rheological characteristics of activated sludge in relation with the nature of the compounds present in the solid and liquid phases. Rheological measurements were carried out on raw sludge and on sludge modified by mechanical actions and/or addition of solids or solutes. The rheological properties of raw and modified sludges were measured according to flow and dynamic measurements. Results demonstrated that if suspended solid concentration affected sludge rheological parameters, the nature of the solids was quite of importance. The key role of nature and molecular weight of solutes was also highlighted. The results contribute to a better knowledge of the relationship between sludge composition and its rheological properties, which is useful for the optimization of sludge mixing, pumping or aeration and also for the improvement of sludge dewatering, notably by a relevant choice of adjuvant.
尽管污泥中固体浓度对流变特性的影响在文献中有大量记载，但很少有研究关注这些固体物质性质的影响。溶质的性质如何改变固液相互作用以及污泥的流变特性也鲜有探讨。因此，本研究的目的是研究活性污泥的流变特性与固液相中存在的化合物性质之间的关系。对原污泥以及通过机械作用和/或添加固体或溶质改性的污泥进行了流变学测量。根据流动和动态测量来测定原污泥和改性污泥的流变特性。结果表明，虽然悬浮固体浓度会影响污泥的流变参数，但固体物质的性质也相当重要。溶质的性质和分子量的关键作用也得到了凸显。这些结果有助于更好地了解污泥组成与其流变特性之间的关系，这对于优化污泥混合、泵送或曝气以及改善污泥脱水（特别是通过合理选择助剂）是有用的。
