Amancio Frutuoso Francisca Kamila, Ferreira Dos Santos Amanda, da Silva França Leonardo Levy, Mendes Barros Antônio Ricardo, Bezerra Dos Santos André
Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Fortaleza, Ceará, Brazil.
Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Fortaleza, Ceará, Brazil.
Bioresour Technol. 2023 May;376:128850. doi: 10.1016/j.biortech.2023.128850. Epub 2023 Mar 9.
Aerobic granular sludge (AGS) systems have great potential for biopolymers recovery, especially when subjected to adverse conditions. This work aimed to study the production of alginate-like exopolymers (ALE) and tryptophan (TRY) under osmotic pressure in conventional and staggered feeding regimes. The results revealed that systems operated with conventional feed accelerated the granulation, although less resistant to saline pressures. The staggered feeding systems favored better denitrification conditions and long-term stability. Salt addition gradient increase influenced biopolymers' production. However, staggered feeding, despite decreasing the famine period, did not influence the production of resources and extracellular polymeric substances (EPS). Sludge retention time (SRT), which was not controlled, proved to be an important operational parameter with negative influences on biopolymers' production in values greater than 20 days. Thus, the principal component analysis confirmed that the production of ALE at low SRT is related to better-formed granules with good sedimentation characteristics and good AGS performances.
好氧颗粒污泥（AGS）系统在生物聚合物回收方面具有巨大潜力，尤其是在遭受不利条件时。这项工作旨在研究在常规和交错进料方式下，渗透压条件下藻酸盐类胞外聚合物（ALE）和色氨酸（TRY）的产生情况。结果表明，采用常规进料运行的系统加速了颗粒化，尽管对盐压力的耐受性较低。交错进料系统有利于更好的反硝化条件和长期稳定性。盐添加梯度的增加影响了生物聚合物的产生。然而，交错进料尽管减少了饥饿期，但并未影响资源和细胞外聚合物（EPS）的产生。未控制的污泥停留时间（SRT）被证明是一个重要的运行参数，当SRT值大于20天时，会对生物聚合物的产生产生负面影响。因此，主成分分析证实，低SRT时ALE的产生与具有良好沉降特性和良好AGS性能的更好形成的颗粒有关。
