Treatment of tapioca processing wastewater in a sequencing batch reactor: Mechanism of granule formation and performance.
The formation of aerobic granular sludge was carried out in a sequencing batch reactor (SBR) for tapioca processing wastewater treatment. The effect of organic loading rates (OLRs) in the range of 2.5–10.0 kg COD m −3 day −1 on the granulation was investigated. The size and settleability of the aero...
| Publicado en: | Journal of Environmental Management Vol. 218; pp. 39 - 50 |
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| Autores principales: | , , , |
| Formato: | Artículo |
| Publicado: |
Academic Press Inc.
Jul2018
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| Materias: | |
| Acceso en línea: | Ver este registro en EBSCOhost |
| Sumario: | The formation of aerobic granular sludge was carried out in a sequencing batch reactor (SBR) for tapioca processing wastewater treatment. The effect of organic loading rates (OLRs) in the range of 2.5–10.0 kg COD m −3 day −1 on the granulation was investigated. The size and settleability of the aerobic granular sludge increased with increasing OLR from 2.5 to 7.5 kg COD m −3 day −1 . The mature granules had an average size of 2.5 mm and good settleability with the sludge volume index (SVI) lower than 50 mL g −1 . The granules had a layered structure consisting of anoxic sludge core with nematodes and an outer aerobic layer surrounded by stalked ciliates. Removal efficiencies of chemical oxygen demand (COD) and NH 4 + -N reached 90.0%–93.0% and 86.6%–92.5%, respectively. Simultaneous nitrification and denitrification at the OLR of 7.5 kg COD m −3 day −1 resulted in the improvement of total nitrogen (TN) removal efficiency to 66.1%. |
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