Research Group BioWAVE, Faculty of Applied Engineering, University of Antwerp, Groenenborgerlaan 171 (G.V.323), 2020 Antwerp, Belgium E-mail:
Pantarein Water bv, Egide Walschaertsstraat 22 L, 2800 Mechelen, Belgium.
Water Sci Technol. 2021 Jan;83(1):39-51. doi: 10.2166/wst.2020.531.
A laboratory-scale sequencing batch reactor was operated for approximately 300 days, divided into four periods based on the feeding strategy, to develop stable aerobic granular sludge (AGS) while treating chocolate processing wastewater. Application of a prolonged mixed anaerobic feeding was not sufficient to develop AGS and reach stable reactor performance. Through the application of a partially non-mixed and a partially mixed feeding strategy, the reactor performance was increased and stable AGS formation was established characterized by low diluted sludge volume index (D)SVI DSVI) values of 78 ± 27 mL·g and 52 ± 17 mL·g, respectively, and a capillary suction time/mixed liquor suspended solids value of 0.9 sec·(g·L). The membrane bioreactor (MBR) filtration tests showed a reduction of the fouling rate (FR) and an increase of the sustainable flux (SF) for AGS compared to flocs treating the same industrial wastewater. The SF (FR > 0.5 mbar·min) for the flocs was 10 L·(m·h) while for AGS the SF is higher than 45 L·(m·h) because the FR did not exceed 0.1 mbar·min. Additionally, the AGS showed reduced irreversible fouling tendencies due to pore blocking. Our results underline the need for an increased substrate gradient during anaerobic feeding for the development and long-term maintenance of AGS under minimum wash-out conditions. The AGS-MBR filtration performance also shows strong advantages compared to a floccular MBR system due to a high increase of the SF and reduced reversible and irreversible fouling.
采用实验室规模的序批式反应器（SBR），通过进料策略将运行时间分为四个阶段，大约 300 天，以在处理巧克力加工废水的同时开发稳定的好氧颗粒污泥（AGS）。采用延长混合厌氧进料的方法不足以开发 AGS 并达到稳定的反应器性能。通过应用部分非混合和部分混合进料策略，提高了反应器性能，并建立了稳定的 AGS 形成，其特征是低稀释污泥体积指数（D）SVIsVI）值分别为 78±27mL·g 和 52±17mL·g，以及毛细抽吸时间/混合液悬浮固体（MLSS）值为 0.9sec·(g·L)。膜生物反应器（MBR）过滤测试表明，AGS 比絮凝体处理相同工业废水时具有更低的污染速率（FR）和更高的可持续通量（SF）。絮凝体的 SF（FR>0.5mbar·min）为 10L·(m·h)，而 AGS 的 SF 高于 45L·(m·h)，因为 FR 没有超过 0.1mbar·min。此外，AGS 由于孔堵塞而表现出降低的不可逆污染趋势。我们的结果强调了在最小冲洗条件下开发和长期维持 AGS 时，需要在厌氧进料过程中增加基质梯度。AGS-MBR 过滤性能也表现出与絮凝体 MBR 系统相比的强大优势，因为 SF 大幅提高，可逆和不可逆污染减少。
