| Autor: |
Stes H; Research Group BioWAVE, Faculty of Applied Engineering, University of Antwerp, Groenenborgerlaan 171 (G.V.323), 2020 Antwerp, Belgium E-mail: jan.dries2@uantwerpen.be; Pantarein Water bv, Egide Walschaertsstraat 22 L, 2800 Mechelen, Belgium., Caluwé M; Research Group BioWAVE, Faculty of Applied Engineering, University of Antwerp, Groenenborgerlaan 171 (G.V.323), 2020 Antwerp, Belgium E-mail: jan.dries2@uantwerpen.be., Dockx L; Research Group BioWAVE, Faculty of Applied Engineering, University of Antwerp, Groenenborgerlaan 171 (G.V.323), 2020 Antwerp, Belgium E-mail: jan.dries2@uantwerpen.be., Cornelissen R; Pantarein Water bv, Egide Walschaertsstraat 22 L, 2800 Mechelen, Belgium., De Langhe P; Pantarein Water bv, Egide Walschaertsstraat 22 L, 2800 Mechelen, Belgium., Smets I; Research Division (Bio)Chemical Reactor Engineering and Safety, Faculty of Engineering Science, KU Leuven, Celestijnenlaan 200f (box 2424), 3001 Leuven, Belgium., Dries J; Research Group BioWAVE, Faculty of Applied Engineering, University of Antwerp, Groenenborgerlaan 171 (G.V.323), 2020 Antwerp, Belgium E-mail: jan.dries2@uantwerpen.be. |
| Abstrakt: |
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 10,30 ) values of 78 ± 27 mL·g -1 and 52 ± 17 mL·g -1 , respectively, and a capillary suction time/mixed liquor suspended solids value of 0.9 sec·(g·L -1 ) -1 . The membrane bioreactor (MBR) filtration tests showed a reduction of the fouling rate (FR) and an increase of the sustainable flux (SF 0.5 ) for AGS compared to flocs treating the same industrial wastewater. The SF 0.5 (FR > 0.5 mbar·min -1 ) for the flocs was 10 L·(m 2 ·h) -1 while for AGS the SF 0.5 is higher than 45 L·(m 2 ·h) -1 because the FR did not exceed 0.1 mbar·min -1 . 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 0.5 and reduced reversible and irreversible fouling. |
