Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.
Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.
Bioresour Technol. 2022 Feb;346:126411. doi: 10.1016/j.biortech.2021.126411. Epub 2021 Nov 25.
Wastewater treatment plants are expected to realize not only pollutants removal from wastewater but also resources recovery such as phosphorus (P) and alginate-like exopolysaccharides (ALE) from the produced sludge. In this study, ALE extraction and fractionation from the same activated sludge-derived bacterial aerobic granular sludge (AGS) and algal-bacterial AGS were performed in addition to P fate examination during ALE recovery. Results showed that the ALE content recovered from algal-bacterial AGS was 8.81 ± 0.02 mg/g-volatile suspended solids (VSS), about 2.8 times higher than that from bacterial AGS when fed with the same synthetic wastewater. Moreover, the mannuronic acid to guluronic acid (MG) blocks accounted for the largest proportion of ALE from the two granular sludges. In particular, the extracellular polymeric substances (EPS) extracted from bacterial and algal-bacterial AGS contained about 25.10 ± 1.85 and 19.53 ± 0.04 mg-P/g-SS, respectively, and both granular sludges possessed high P bioavailability of 97-99%.
污水处理厂不仅要实现从废水中去除污染物，还要从产生的污泥中回收磷（P）和类似褐藻胶的胞外多糖（ALE）等资源。在这项研究中，除了研究 ALE 回收过程中的磷去向，还从相同的好氧颗粒污泥（AGS）和藻菌AGS 中提取和分级 ALE。结果表明，当用相同的合成废水进料时，从藻菌AGS 中回收的 ALE 含量为 8.81±0.02mg/g-挥发性悬浮固体（VSS），约为细菌AGS 的 2.8 倍。此外，来自这两种颗粒污泥的 ALE 中，甘露糖醛酸到古洛糖醛酸（MG）块占比最大。特别是从细菌和藻菌AGS 中提取的胞外聚合物（EPS）分别含有约 25.10±1.85mg-P/g-SS 和 19.53±0.04mg-P/g-SS，两种颗粒污泥的磷生物有效性均高达 97-99%。
