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From waste to wealth: Exploring the effect of particle size on biopolymer harvesting from aerobic granular sludge
Bioresource Technology ( IF 9.7 ) Pub Date : 2024-12-12 , DOI: 10.1016/j.biortech.2024.131977
Haifeng Zhang, Runze Zhang, Yupeng Du, Shujuan Huang, Fei Zhao, Dong-Hoon Kim, How Yong Ng, Xueqing Shi, Boyan Xu

This study aimed to examine the impact of aerobic granular sludge (AGS) sizes on its properties and alginate-like exopolymers (ALE) recovery potential. The AGS was cultivated in a lab-scale bioreactor and categorized into six size classes with 200 μm intervals. There appeared a critical size (400–800 μm) for developing stable AGS structure and excellent ALE recovery. A higher hydrophobicity (74.36 %) and density (1,037 g/L) was observed in AGS400-600μm than other sizes. Moreover, the highest ALE yield was obtained in ALE600-800μm (388 mg/g VSS) for its higher abundance of EPS-producers (35.1 %), while the PN content of ALE400-600μm was higher than other samples. Meanwhile, the concentrations of metal elements within the ALE and AGS identified that there was no bio-accumulation of metal elements in the ALE. This study offers an in-depth understanding of biopolymer recovery from AGS, paving the way for a novel resource recovery strategy through the regulation of AGS sizes.

中文翻译:


从废物到财富:探索颗粒大小对好氧颗粒污泥中生物聚合物收集的影响



本研究旨在检验好氧颗粒污泥 (AGS) 尺寸对其性能和藻酸盐类外聚物 (ALE) 回收潜力的影响。AGS 在实验室规模的生物反应器中培养,并分为 6 个大小等级,间隔为 200 μm。出现了一个临界尺寸 (400–800 μm) 来开发稳定的 AGS 结构和出色的 ALE 回收率。AGS400-600μm 的疏水性 (74.36%) 和密度 (1,037 g/L) 高于其他尺寸。此外,ALE600-800μm (388 mg/g VSS) 的 ALE 产量最高,因为它的 EPS 产生者丰度较高 (35.1 %),而 ALE400-600μm 的 PN 含量高于其他样品。同时,ALE 和 AGS 中金属元素的浓度确定 ALE 中没有金属元素的生物积累。本研究提供了对从 AGS 中回收生物聚合物的深入理解,为通过调节 AGS 大小的新型资源回收策略铺平了道路。
更新日期:2024-12-12
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