Biological phosphorus removal and its microbial community in a modified full-scale activated sludge system under dry and wet weather dynamics

Brown, Patrick; Ikuma, Kaoru; Ong, Say Kee

doi:10.1016/j.watres.2022.118338

Cited by 7 publications

(1 citation statement)

References 44 publications

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“…Collectively, the observed %PAO of the respective MMC exceeded observations in our previous investigations (Coats et al, 2015; Coats et al, 2017), which were based on non‐nitrifying A/O EBPR configurations. Results were also markedly greater than observed by Brown et al (2022) within a full‐scale WRRF, wherein PAOs were observed at ~1.0% of the bacterial population in a WRRF modified to operate in an A/O‐type configuration. However, the %PAO observed herein was consistent with a previous post‐anoxic EBPR investigation (Winkler et al, 2011) and also He et al (2007) and Roots et al (2020) on full‐scale and pilot‐scale EBPR sludge, respectively.…”

Section: Resultscontrasting

confidence: 58%

Interrogating the performance and microbial ecology of an enhanced biological phosphorus removal/post‐anoxic denitrification process at bench and pilot scales

Coats

Appel

Guho

et al. 2023

Water Environment Research

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Research focused on interrogating post‐anoxic enhanced biological phosphorus removal (EBPR) at bench and pilot scales. Average bench‐scale effluent ranged from 0.33 to 1.4 mgP/L, 0.35 to 3.7 mgNH3‐N/L, and 1.1 to 3.9 mgNOx‐N/L. Comparatively, the pilot achieved effluent (50th percentile/average) of 0.13/0.2 mgP/L, 9.7/8.2 mgNH3‐N/L, and 0.38/3.3 mgNOx‐N/L under dynamic influent and environmental conditions. For EBPR process monitoring, P:C ratio data indicated that 0.2–0.4 molP/molC will result in stable EBPR; relatedly, a target design influent volatile fatty acid (VFA):P ratio would exceed 15 mgCOD/mgP. Post‐anoxic EBPR was enriched for Nitrobacter spp. at 1.70%–20.27%, with Parcubacteria also dominating; the former is putatively associated with nitritation and the latter is a putative fermenting heterotrophic organism. Post‐anoxic specific denitrification rates (SDNRs) (20°C) ranged from 0.70 to 3.10 mgN/gVSS/h; there was a strong correlation (R2 = 0.94) between the SDNR and %Parcubacteria for systems operated at a 20‐day solids residence time (SRT). These results suggest that carbon substrate potentially generated by this putative fermenter may enhance post‐anoxic EBPR. Practitioner Points Post‐anoxic EBPR can achieve effluent of <0.2 mgP/L and <12 mgN/L. The P:C and VFA:P ratios can be predictive for EBPR process monitoring. Post‐anoxic EBPR was enriched for Nitrobacter spp. over Nitrospira spp. and also for Parcubacteria, which is a putative fermenting heterotrophic organism. Post‐anoxic specific denitrification rates (20°C) ranged from 0.70 to 3.10 mgN/gVSS/h. BLASTn analysis of 16S rDNA PAO primer set was shown to be improved to 93.8% for Ca. Accumulibacter phosphatis and 73.2%–94.0% for all potential PAOs.

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