Anoxic growth of phosphate-accumulating organisms (PAOs) in biological nutrient removal activated sludge systems

Hu, Zhi-rong; Wentzel, M. C.; Ekama, George A.

doi:10.1016/s0043-1354(02)00186-0

Cited by 139 publications

(82 citation statements)

References 18 publications

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“…Therefore, PAOs often grew in anoxic conditions imitating the amount of stored substrate [44]. Consequently, the availability of the stored substrate required for the PO 4 -P uptake, during the aerobic conditions, was very limited.…”

mentioning

confidence: 99%

Carbon and nutrient biological removal in a University of Cape Town membrane bioreactor: Analysis of a pilot plant operated under two different C/N ratios

Mannina

Capodici

Cosenza

et al. 2016

Chemical Engineering Journal

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mentioning

confidence: 99%

Carbon and nutrient biological removal in a University of Cape Town membrane bioreactor: Analysis of a pilot plant operated under two different C/N ratios

Mannina

Capodici

Cosenza

et al. 2016

Chemical Engineering Journal

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“…In ICL-5 nitrate removal rate declines in spite of a high COD/NO 3 ratio, which has been reported earlier to have favoured nitrate reduction [30,27]. In ICL-5 a rise in carbon concentration also lowers the phosphate/COD ratio to 0.004 in the medium which has been stated [31,32] to be a favourable condition for the metabolism of other heterotrophic organisms (OHOs) like Glycogen Accumulating Organisms (GAOs) [33][34][35]. Under similar conditions PAOs are also reported to behave as GAOs [14] and a low phosphate/COD ratio is usually preferred for enrichment of GAOs [31,36].…”

Section: Nutrient and Cod Removalmentioning

confidence: 80%

Sorption and Release of Organics by Primary, Anaerobic, and Aerobic Activated Sludge Mixed with Raw Municipal Wastewater

Sánchez¹

2016

Environmental Engineering and Activated Sludge Processes

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Simultaneous nitrate-N, phosphate and COD removal was evaluated from synthetic waste water using mixed microbial consortia in an anoxic environment under various initial carbon load (ICL) in a batch scale reactor system. Within 6 hours of incubation, enriched DNPAOs (Denitrifying Polyphosphate Accumulating Microorganisms) were able to remove maximum COD (87%) at 2g/L of ICL whereas maximum nitrate-N (97%) and phosphate (87%) removal along with PHB accumulation (49 mg/L) was achieved at 8 g/L of ICL. Exhaustion of nitrate-N, beyond 6 hours of incubation, had a detrimental effect on COD and phosphate removal rate. Fresh supply of nitrate-N to the reaction medium, beyond 6 hours, helped revive the removal rates of both COD and phosphate. Therefore, it was apparent that in spite of a high carbon load, maximum COD and nutrient removal can be maintained, with adequate nitrate-N availability. Denitrifying condition in the medium was evident from an increasing pH trend. PHB accumulation by the mixed culture was directly proportional to ICL; however the time taken for accumulation at higher ICL was more. Unlike conventional EBPR, PHB depletion did not support phosphate accumulation in this case. The unique aspect of all the batch studies were PHB accumulation was observed along with phosphate uptake and nitrate reduction under anoxic conditions. Bioinformatics analysis followed by pyrosequencing of the mixed culture DNA from the seed sludge revealed the dominance of denitrifying population, such as Corynebacterium, Rhodocyclus and Paraccocus (Alphaproteobacteria and Betaproteobacteria). Rarefaction curve indicated complete bacterial population and corresponding number of OTUs through sequence analysis. Chao1 and Shannon index (H') was used to study the diversity of sampling. "UCI95" and "LCI95" indicated 95% confidence level of upper and lower values of Chao1 for each distance. Values of Chao1 index supported the results of rarefaction curve.

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“…Net Premoval from wastewater is achieved through the wastage of activated sludge (WAS) at the end of the aerobic phase, when the sludge contains a high poly-P content (Figure 2.2.1). Alternatively, denitrifying phosphorus-accumulating organisms (DPAOs) exist which can also take up PO4 under anoxic conditions using nitrate or nitrite as electron acceptors (Vlekke et al, 1988;Kuba et al, 1993;Hu et al, 2002;Kerr-Jespersen et al, 1993;Guisasola et al, 2009). Also, PAOs, being heterotrophic organisms, are able to take up carbon sources under aerobic conditions, releasing orthophosphate while the carbon source is available and removing PO4 afterwards (Guisasola et al, 2004;Ahn et al, 2007).…”

Section: Process Descriptionmentioning

confidence: 99%

“…However, to a certain extent, it has been a matter of controversy particularly due to the rather variable and inconsistent anoxic Premoval activities observed in full-scale systems (Hu et al, 2002) and theoretically decreased P-removal potentially caused by lower PAO biomass yields. As observed in Table 2.2.9, the anoxic P-uptake rate scarcely reaches more than 5 mg PO4-P g VSS and, even under certain circumstances, it is very low or absent.…”

Section: Anoxic Batch Activity Testsmentioning

confidence: 99%

Experimental Methods in Wastewater Treatment

Loosdrecht¹,

Nielsen²,

López-Vázquez³

et al. 2016

Water Intelligence Online

137

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PrefaceWastewater treatment is a core technology for water resources protection and reuse, as is clearly demonstrated by the great success of its consequent implementation in many countries worldwide. During the last decennia scientific research has made vast progress in understanding the complex and interdisciplinary aspects of the biological, biochemical, chemical and mechanical processes involved. It can be concluded that the global application of existing knowledge and experience in wastewater treatment technology will represent a cornerstone in future water management, as expressed in the Strategic Development Goals accepted by the UN in September 2015.Only about one fifth of the wastewater produced globally is currently being adequately treated. To achieve the goal for sustainable water management by 2030 would require extra wastewater treatment facilities for about 600,000 people each day. I am convinced that this book will make its own significant contribution to meeting this ambitious goal.In the near future, most of the global population will live in cities and in low and middle-income countries, where most wastewater is not adequately treated. Probably the most limiting factor in achieving the goals for sustainable water management is the lack of qualified, well-trained professionals, able to comprehend the scientific research results and transfer them into practice. It is therefore of prime importance to make currently available scientific advances and proven experiences in wastewater treatment technology applications easily accessible worldwide. This was one of the drivers for the development of this book, which represents an innovative contribution to help overcome such a capacity development challenge. The book is most definitely expected to contribute to bridging the gaps between the science and technology, and their practical applications.The great collection of authors and reviewers represents an interdisciplinary team of globally acknowledged experts. The book will therefore make a major contribution to establishing a common professional language, enhancing global communication between wastewater professionals. In addition, the authors have linked the description of the scientific basis for wastewater treatment processes with a video-based online course for the training of students, researchers, engineers, laboratory technicians and treatment plant operators, demonstrating commonly accepted experimentation procedures and their application for lab-, pilot-, and full-scale treatment plant operation.From the perspective of the IWA this book also has the great potential to enhance the development of a new generation of researchers and enable them to communicate on a global scale and beyond their specific field of expertise. Both aspects are urgently needed to develop adapted solutions for specific local conditions and to make them globally available for implementation.There has been a trend for some time that scientific research and practice have been growing apart from each other. Part of the rea...

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Anoxic growth of phosphate-accumulating organisms (PAOs) in biological nutrient removal activated sludge systems

Cited by 139 publications

References 18 publications

Carbon and nutrient biological removal in a University of Cape Town membrane bioreactor: Analysis of a pilot plant operated under two different C/N ratios

Carbon and nutrient biological removal in a University of Cape Town membrane bioreactor: Analysis of a pilot plant operated under two different C/N ratios

Sorption and Release of Organics by Primary, Anaerobic, and Aerobic Activated Sludge Mixed with Raw Municipal Wastewater

Experimental Methods in Wastewater Treatment

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