Enhancing aerobic granulation for biological nutrient removal from domestic wastewater
2012
Coma, M. | Verawaty, M. | Pijuan, M. | Yuan, Z. | Bond, P.L.
This study focuses on the enhancement of aerobic granulation and biological nutrient removal maintenance treating domestic wastewater. Two sequencing batch reactors (SBRs) were inoculated with either only floccular sludge (100%-floc SBR) or supplemented with 10% crushed granules (90%-floc SBR). Granules developed in both reactors. The 100%-floc SBR achieved 75% of nitrogen and 93% of phosphorus removal at the end of the performance, but some floccular sludge remained in the system. The 90%-floc SBR became fully granulated and finished with 84% and 99% of nitrogen and phosphorus removal, respectively. Regarding biological phosphorus removal, nitrite was identified as an inhibitor of the process. Nitrite levels lower than 5mgN–NO₂ ⁻L⁻¹ were used for anoxic phosphate uptake while higher concentrations inhibited the process.
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