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Formation of aerobic granular sludge during the treatment of petrochemical wastewater

Journal Contribution - Journal Article

In this study, petrochemical wastewater from the port of Antwerp was used for the development of aerobic granular sludge. Two different reactor setups were used, (1) a completely aerated sequencing batch reactor (SBRae) with a feast/famine regime and (2) a sequencing batch reactor operated with an anaerobic feast/aerobic famine strategy (SBRan). The seed sludge showed poor settling characteristics with a sludge volume index (SVI) of 285 mL.g MLSS−1 and a median particle size by volume of 86.0 µm ± 1.9 µm. In both reactors, granulation was reached after 30 days with a SVI of 71 mL.g MLSS−1 and median granule size of 264.7 µm in SBRan and a SVI of 56 mL.g MLSS−1 and median granule size of 307.4 µm in SBRae. The chemical oxygen demand (COD) and dissolved organic carbon (DOC) removal was similar in both reactors and above 95%. The anaerobic DOC uptake increased from 0.13% to 43.2% in 60 days in SBRan.
Journal: Bioresource Technology
ISSN: 0960-8524
Volume: 238
Pages: 559 - 567
Publication year:2017