AI Article Synopsis
- A new two-stage sequencing batch reactor (SBR) system with iron shavings was created to tackle nutrient removal challenges and improve the formation of aerobic granular sludge (AGS) in low carbon to nitrogen (C/N) ratio conditions.
- The system effectively removed 82.8% nitrogen and 94.7% phosphorus while increasing AGS size from 45.3 μm to around 138.7 μm in the first reactor (R1) and 132.8 μm in the second (R2).
- Specific microorganisms were enriched in R1 for phosphorus removal, while R2 showed increased levels of nitrifying bacteria and improved nitrogen removal through autotrophic denitrification.
Article Abstract
In response to the challenges of limited nutrient removal and the difficulty in forming aerobic granular sludge (AGS) with low carbon to nitrogen (C/N) ratios, a novel two-stage sequencing batch reactors (SBRs) (R1 and R2) system with added iron shavings was proposed and established. The results showed that AGS was developed and nitrogen (82.8 %) and phosphorus (94.7 %) were effectively removed under a C/N ratio at 1.7 ± 0.5. The average size of R1 and R2 increased from 45.3 μm to 138.7 μm and 132.8 μm. Under high biological selective pressure, phosphorus accumulating organisms like Comamonadaceae (14.8 %) and Chitinophagales (5.7 %) experienced enrichment in R1. Furthermore, R2 exhibited an increased abundance of nitrifying bacteria (2.3 %) and a higher proportion of nitrogen removal through autotrophic denitrification (＞17.5 %). Overall, this study introduces an innovative two-stage SBRs with added iron shavings, offering a novel approach for the treatment of low C/N ratios wastewater.
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| http://dx.doi.org/10.1016/j.biortech.2024.130380 | DOI Listing |
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