Abstract
We studied the applicability of aerobic granular sludge (AGS) technology in association with upflow anaerobic sludge blanket (UASB) reactors for swine wastewater (SWW) treatment. Granule formation, long-term operational evaluation, and the system performance for simultaneous C, N, and P removals were assessed. Finally, the AGS microbial changes were evaluated by metagenomic analysis. Aerobic granulation occurred after 54 days of operation, and 81% of the granules had a diameter above 1.0 mm after 96 days of the experiment. The granules formed were spherical, had cohesive structure and good sedimentation capacity, although they were classified as non-resistant. After the sludge granulation (steady-state), high COD, BOD and ammonia removals were found, although the removals of TN and TP were considered moderate. Nonetheless, overall, a good operational stability was achieved. The metagenomic analysis revealed that the microbial groups suffered great influence from the substrate characteristics, but they are commonly found in AGS systems.
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