Improved phosphate removal by selective sludge discharge in aerobic granular sludge reactors

Biotechnology and Bioengineering
J P BassinM C M van Loosdrecht

Abstract

Two lab-scale aerobic granular sludge sequencing batch reactors were operated at 20 and 30°C and compared for phosphorus (P) removal efficiency and microbial community composition. P-removal efficiency was higher at 20°C (>90%) than at 30°C (60%) when the sludge retention time (SRT) was controlled at 30 days by removing excess sludge equally throughout the sludge bed. Samples analyzed by fluorescent in situ hybridization (FISH) indicated a segregation of biomass over the sludge bed: in the upper part, Candidatus Competibacter phosphatis (glycogen-accumulating organisms--GAOs) were dominant while in the bottom, Candidatus Accumulibacter phosphatis (polyphosphate-accumulating organisms--PAOs) dominated. In order to favour PAOs over GAOs and hence improve P-removal at 30°C, the SRT was controlled by discharging biomass mainly from the top of the sludge bed (80% of the excess sludge), while bottom granules were removed in minor proportions (20% of the excess sludge). With the selective sludge removal proposed, 100% P-removal efficiency was obtained in the reactor operated at 30°C. In the meantime, the biomass in the 30°C reactor changed in color from brownish-black to white. Big white granules appeared in this system and were compl...Continue Reading

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Nov 22, 2008·Water Research·Carlos M Lopez-VazquezMark C M van Loosdrecht
Dec 6, 2008·Bioresource Technology·Filomena FreitasMaria A M Reis

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Citations

Oct 16, 2012·Applied Microbiology and Biotechnology·M-K H WinklerM C M van Loosdrecht
Dec 3, 2014·Journal of Hazardous Materials·Y V NancharaiahV P Venugopalan
Nov 6, 2012·Water Research·M-K H WinklerM C M van Loosdrecht
Jul 17, 2012·Water Research·Mari K H WinklerMark C M van Loosdrecht
Nov 21, 2015·Bioresource Technology·Bin MaYongzhen Peng
Jan 3, 2013·Biotechnology and Bioengineering·Kui-Zu SuHan-Qing Yu
Jul 20, 2016·Bioresource Technology·Yuanyao YeDinh Duc Nguyen
Sep 6, 2020·Bioprocess and Biosystems Engineering·Silvio Luiz de Sousa RollembergAndré Bezerra Dos Santos
Feb 15, 2021·Chemosphere·Clara de Amorim de CarvalhoAndré Bezerra Dos Santos
May 8, 2021·Journal of Environmental Management·Tasso Jorge Tavares FerreiraAndré Bezerra Dos Santos

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