Zhang Haifeng, Zhang Runze, Du Yupeng, Huang Shujuan, Zhao Fei, Kim Dong-Hoon, Ng How Yong, Shi Xueqing, Xu Boyan
National and Local & Joint Engineering Research Center for Urban Sewage Treatment and Resource Recycling, School of Environmental and Municipal Engineering, Qingdao University of Technology, 11 Fushun Road, Qingdao 266033, China.
Department of Smart City Engineering, Inha University, 100 Inharo, Michuhol-gu, Incheon 22212, South Korea.
Bioresour Technol. 2025 Feb;418:131977. doi: 10.1016/j.biortech.2024.131977. Epub 2024 Dec 12.
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 AGS than other sizes. Moreover, the highest ALE yield was obtained in ALE (388 mg/g VSS) for its higher abundance of EPS-producers (35.1 %), while the PN content of ALE 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.
本研究旨在考察好氧颗粒污泥（AGS）粒径对其性质及类藻酸盐胞外聚合物（ALE）回收潜力的影响。AGS在实验室规模的生物反应器中培养，并按200μm的间隔分为六个粒径等级。出现了一个临界粒径（400 - 800μm），以形成稳定的AGS结构和优异的ALE回收效果。与其他粒径相比，AGS表现出更高的疏水性（74.36%）和密度（1037 g/L）。此外，ALE中由于其较高丰度的EPS生产者（35.1%）而获得了最高的ALE产量（388 mg/g VSS），而ALE的PN含量高于其他样品。同时，ALE和AGS中金属元素的浓度表明ALE中不存在金属元素的生物累积。本研究深入了解了从AGS中回收生物聚合物的情况，为通过调节AGS粒径实现新型资源回收策略铺平了道路。
