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Article Abstract
Three parallel sequencing batch reactors (control, small-sized polyurethane sponge (PUS) (3.0 mm), and large-sized PUS (10.0 mm)) were used to investigate aerobic granular biofilm (AGB) characteristics. Results show that 10.0 mm PUS facilitated rapid formation of large-sized AGB (AGB), which exhibited higher biomass concentration (8.5 g/L) and faster settling velocity (69.2-159.3 m/h) than aerobic granular sludge (AGS) (3.2 g/L and 38.6-80.0 m/h). The AGB system also maintained long-term structural stability with a lower instability coefficient (0.004-0.018 min) than AGS (0.053-0.090 min). Additionally, during long-term operation, the AGB system achieved excellent removal efficiencies for NH-N (99.6 ± 0.4 %) and total nitrogen (92.3 ± 2.6 %), and exhibited a lower sludge yield (0.05 gVSS/gCOD) than AGS (0.14 gVSS/gCOD). The larger size and compact structure of AGB increased anoxic/anaerobic zones, enriching denitrifying and hydrolytic/fermentative bacteria. These findings highlight AGB with large PUS as a more promising biotechnology for practical applications than conventional AGS.
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| http://dx.doi.org/10.1016/j.biortech.2025.132543 | DOI Listing |
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