Inducing mechanism of biological phosphorus removal driven by the aerobic/extended-idle regime

Biotechnology and Bioengineering
Dong-bo WangGuangming Zeng

Abstract

Recently, it was found that excess phosphorus (Pi) removal could be achieved in activated sludge with an aerobic/extended-idle (AEI) process. In this study, batch tests were performed to further reveal the inducing mechanism of Pi removal involved in the AEI process. Unlike the classical anaerobic/aerobic process where an anaerobic Pi release along with a significant polyhydroxyalkanoate (PHA) accumulation drives polyphosphate (poly-P) accumulating organisms (PAOs) to over-store Pi as poly-P, an idle Pi release accompanied by a low-idle PHA production, which is usually considered to be detrimental for biological Pi removal, was observed to induce some cells to effectively uptake Pi in excess of metabolic requirement in the AEI process. With the increase of idle Pi release, Pi removal efficiency linearly increased. The results also showed that a long idle period with a low level of intracellular glycogen could significantly increase Pi release contents, thus remarkably enhancing Pi removal performances. Fluorescence in situ hybridization analysis further revealed that activated sludge in the AEI process contained 37.6% of Accumulibacter (PAOs) and 28.2% of Competibacter and Defluviicoccus-related organisms (glycogen accumulating...Continue Reading

References

Jan 21, 2006·Environmental Microbiology·Liz J ShawElizabeth M Baggs
Sep 26, 2006·Nature Biotechnology·Héctor García MartínPhilip Hugenholtz
Apr 17, 2007·Water Research·Adrian OehmenMaria A M Reis
Dec 18, 2007·Bioresource Technology·Dong-Bo WangJie Zhang
Aug 10, 2011·Applied Microbiology and Biotechnology·Ana F SilvaM Teresa Barreto Crespo

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Citations

Jan 28, 2014·Environmental Science and Pollution Research International·Hong-Bo ChenGuang-Ming Zeng
Oct 25, 2016·Journal of Hazardous Materials·Hongxue AnGuangming Zeng
Jan 10, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Dacheng LuoXin Wang
Apr 6, 2020·Environmental Science and Pollution Research International·Dharman KalaimuruganSrinivasan Venkatesan

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