Federal University of Santa Catarina, Trindade University Campus, Sanitary and Environmental Engineering Department, 88040-970 Florianópolis, Brazil; Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dübendorf, Switzerland.
Federal University of Santa Catarina, Trindade University Campus, Sanitary and Environmental Engineering Department, 88040-970 Florianópolis, Brazil.
Bioresour Technol. 2021 Aug;333:125167. doi: 10.1016/j.biortech.2021.125167. Epub 2021 Apr 15.
This worked assessed the potential of alginate-like exopolymers (ALE) hydrogels recovered from aerobic granular sludge (AGS) in removing compounds commonly present in municipal wastewater. Batch sorption experiments were performed with ALE hydrogels at different operating conditions. Results showed that ALE hydrogels can only remove phosphate, at removal efficiencies of up to 90.8% and practical loadings of 1.22 ± 0.07 mg PO-P/g TS. Phosphate removal was observed even in the presence of competing ions. Moreover, neutral to acidic pH values strongly impaired the phosphate removal (28.9 ± 0.8% at pH = 6.00), while basic pH at around 8.50 was the most favourable (up to 90.8% at pH = 8.67). However, ALE hydrogels contributed to the increase in COD, total nitrogen and total phosphorus in the bulk liquid, what suggests that ALE need to be further tailored. Therefore, this study demonstrates that ALE represent a relevant approach for the recovery of phosphates from municipal wastewater.
本研究评估了从好氧颗粒污泥（AGS）中回收的藻酸盐样胞外聚合物（ALE）水凝胶去除城市废水中常见化合物的潜力。在不同操作条件下，通过 ALE 水凝胶进行了批量吸附实验。结果表明，ALE 水凝胶只能去除磷酸盐，去除效率高达 90.8%，实际负载量为 1.22 ± 0.07 mg PO-P/g TS。即使存在竞争离子，也能观察到磷酸盐的去除。此外，中性到酸性 pH 值强烈影响磷酸盐的去除（pH=6.00 时为 28.9 ± 0.8%），而接近 8.50 的碱性 pH 值最有利（pH=8.67 时高达 90.8%）。然而，ALE 水凝胶导致液体主体中 COD、总氮和总磷的增加，这表明 ALE 需要进一步调整。因此，本研究表明 ALE 是从城市废水中回收磷酸盐的一种相关方法。
