Interactions between calcium precipitation and the polyphosphate-accumulating bacteria metabolism

Barat, R.; Montoya, Tatiana; Borrás, L.; Ferrer, J.; Seco, A.

doi:10.1016/j.watres.2008.05.003

Cited by 64 publications

(52 citation statements)

References 31 publications

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“…Also, the formation of precipitates was visible in the P-only and P + Mix systems at the conclusion of the experiments. It is well-known that P can be removed from wastewater via chemical precipitation by the addition of divalent and trivalent metal salts [38][39][40]. It is thus likely that ferric ions lost from the slag combine with P in solution to form ferric phosphate (FePO 4 ).…”

Section: (C)mentioning

confidence: 99%

A Laboratory Study of the Treatability of Synthetic Stormwater Under Varying Conditions Using Electric Arc Furnace Steel Slag

Okochi

McMartin

2012

Water

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Abstract:The investigation of electric arc furnace (EAF) steel slag as a viable add-on technology to existing stormwater systems for the removal of dissolved phosphorus (P) was extended to explore the effects of varying environmental and treatment system conditions. Parameters such as stormwater composition, P concentration, metal concentration, pH, temperature, slag mass and slag particle size were varied. Observations relating to the method of P removal via EAF slag were also carefully considered to explain removal mechanisms involved. Results demonstrated that, although physisorption contributed to P reduction, it was not the key P removal mechanism. Instead, precipitation was observed to be a key removal pathway as evidenced by the correlation between the loss of iron (Fe) from slag and the amount of P removed from solution. The reduced removal of P by slag in a copper-dominant stormwater solution was attributed to the formation of a stable complex formed by the interaction of copper with the slag via the ion-exchange surface model. The stability of this complex inhibits the loss of Fe from the EAF slag and, consequently, P removal by means of precipitation. In terms of the effect of changing environmental and treatment system conditions on the P removal process, stormwater composition, P concentration, metal concentration, pH, temperature, slag mass and slag particle size were found to significantly influence the effectiveness of EAF slag in removing P from a given stormwater system. It was also established that a number of combinations of these factors influence P uptake differently. OPEN ACCESSWater 2012, 4 322

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Section: (C)mentioning

confidence: 99%

A Laboratory Study of the Treatability of Synthetic Stormwater Under Varying Conditions Using Electric Arc Furnace Steel Slag

Okochi

McMartin

2012

Water

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“…Therefore, decreases in EBPR capacity may not necessarily reflect shifts in community composition, but in the existing population metabolism to GAO phenotype. Similarly, Barat et al (2008) and Zhou et al (2008) observed that under poly-P-limited conditions, the highly enriched PAO culture is able to take up acetate using glycogen as the primary energy source.…”

Section: Resultsmentioning

confidence: 87%

The effects of carbon/phosphorus ratio on polyphosphate- and glycogen-accumulating organisms in aerobic granular sludge

Muszyński

Miłobędzka

2015

Int. J. Environ. Sci. Technol.

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A laboratory-scale granular sequencing batch reactor, fed with acetate, was operated at two different ratios of chemical oxygen demand to phosphorus-15:1 and 100:1. Smaller aerobic granules, but with better settleability, were obtained at the lower ratio. High ratio of phosphorus release to uptake of dissolved organic carbon (0.42 mol/mol) coincided with high percentage of polyphosphate-accumulating organisms (up to 70 % of all bacteria) and implied high metabolic activity of these bacteria. Polyphosphate-accumulating organisms belonged mainly to Accumulibacter and Tetrasphaera (46 and 23 %, respectively). Despite significant abundance, Tetrasphaera-related microorganisms were not detected by oligoprobes Actino-221 and Actino-658, but by broader oligoprobes Tet2-892 and Tet3-654. Low abundance (1 %) of Halomonas phosphatis indicated a minor role of these bacteria in the laboratory-scale reactor fed with synthetic wastewater. When the ratio of chemical oxygen demand to phosphorus was increased to 100:1, deterioration of settling properties was observed, caused by growth of filamentous organisms from Thiothrix/021N group. The higher ratio favoured Competibacter and was selected against all groups of polyphosphate-accumulating organisms. However, a significant percentage (10 %) of polyphosphate-accumulating organisms in the granular sludge with concomitant low ratio of phosphorus release to the uptake of dissolved organic carbon (0.01 mol/mol) suggested shift in the overall population metabolism. Under phosphorus limitation in wastewater, polyphosphate-accumulating organisms no longer synthesized poly-P and behaved as glycogen-accumulating organisms.

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“…The use of sulphuric acid and alkaline, phosphate buffers and Tris(hydroxymethyl)aminomethane (Tris) solutions must be avoided. This is mostly since they can lead to interferences such as benefiting sulphate-reducing bacteria (SRB) over PAOs (Saad et al, 2013, RubioRincon et al, 2016, enhancing P precipitation with carbonate species (chemical Pprecipitation) (Barat et al, 2008) or increasing the salinity levels beyond those that PAOs can withstand (Welles et al, 2014). It is needless to say that proper pH control is essential for the success of experiments as even very short exposure of biomass to extreme pH (low or high) will quite certainly affect the biomass irreversibly.…”

Section: Ph Controlmentioning

confidence: 99%

“…For instance, potassium, magnesium, iron, and calcium, among others, are rather important to regulate the microbial EBPR metabolism and support the storage of intracellular compounds Burow et al, 2007;Barat et al, 2008). Their absence, for instance of potassium, can lead to the deterioration of the EBPR process , but their excess can influence the metabolism of PAOs inducing a GAO metabolism (Jobaggy et al, 2006;Barat et al, 2008), possibly due to the chemical precipitation of phosphorus with the aforementioned elements. This will reduce their bio-availability and therefore the aerobic replenishment of poly-P pools.…”

Section: Shortage Of Essential Ionsmentioning

confidence: 99%

Experimental Methods in Wastewater Treatment

Loosdrecht¹,

Nielsen²,

López-Vázquez³

et al. 2016

Water Intelligence Online

138

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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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Interactions between calcium precipitation and the polyphosphate-accumulating bacteria metabolism

Cited by 64 publications

References 31 publications

A Laboratory Study of the Treatability of Synthetic Stormwater Under Varying Conditions Using Electric Arc Furnace Steel Slag

A Laboratory Study of the Treatability of Synthetic Stormwater Under Varying Conditions Using Electric Arc Furnace Steel Slag

The effects of carbon/phosphorus ratio on polyphosphate- and glycogen-accumulating organisms in aerobic granular sludge

Experimental Methods in Wastewater Treatment

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