Enhanced biological phosphorus removal with different carbon sources

Shen, Nan; Zhou, Yan

doi:10.1007/s00253-016-7518-4

Cited by 93 publications

(30 citation statements)

References 66 publications

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“…The relative proportions of VFAs in the UFAT overflow were also more consistent than those measured in the PE. Previous studies indicated that VFA uptake rates of PAOs were similar using either acetate or propionate as carbon sources, while GAOs seem to have different preferences (Shen & Zhou 2016;Dai et al 2007;Oehmen et al 2006). VFA feeding strategies such as switching use of acetate/propionate (Lu et al, 2006), dosing VFA slowly and continuously (Tu and Schuler, 2013), feeding a combination of acetate and propionate (López-Vá zquez et al, 2009), and propionate-feeding under different C/P ratios (Broughton et al, 2008) were found to enrich lab-scale reactors with Accumulibacter, while excluding GAOs.…”

Section: Impacts Of Vfa Compositionmentioning

confidence: 95%

A Full-Scale Comparative Study of Conventional and Side-Stream Enhanced Biological Phosphorus Removal Processes

Wang¹,

Tooker²,

Srinivasan³

et al. 2018

Preprint

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In this study, a full-scale pilot testing was performed with side-by-side operation of a conventional enhanced biological phosphorus removal (EBPR) process and a side-stream EBPR (S2EBPR) process. A comparison of the performance, activities and population dynamics of key functionally relevant populations between the two configurations were carried out. The results demonstrated that, with the same influent wastewater characteristics, S2EBPR configuration showed more effective and stable orthophosphate (PO4-P) removal performance (up to 94% with average effluent concentration down to 0.1 mg P/L) than conventional EBPR, especially when the mixers in side-stream reactor were operated intermittently. Mass balance analysis illustrated that both denitrification and EBPR performance have been enhanced in S2EBPR configuration through diverting primary effluent to anoxic zone and producing additional carbon (~40%) via fermentation in side-stream reactor. Microbial characterization showed that there was no significant difference in the relative abundances of Ca. Accumulibacter (~5.9%) and Tetrasphaera (~16%) putative polyphosphate-accumulating organisms (PAOs) between the two configurations. However, lower relative abundance of known GAOs was observed in S2EBPR configuration (1.1%) than the conventional one (2.7%). A relatively higher PAO activity and increased degree of dependence on glycolysis pathway than TCA cycle was observed in S2EBPR configuration using P release and uptake batch test. Adequate anaerobic solid retention time (SRT) and conditions that generate continuous and slow feeding/production of volatile fatty acid (VFA) with higher composition percentage of propionate in the side-stream reactor of S2EBPR process likely provide a competitive advantage for PAOs over GAOs.

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Section: Impacts Of Vfa Compositionmentioning

confidence: 95%

A Full-Scale Comparative Study of Conventional and Side-Stream Enhanced Biological Phosphorus Removal Processes

Wang¹,

Tooker²,

Srinivasan³

et al. 2018

Preprint

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“…Normally, Pi is removed from wastewaters by chemical precipitation, which is an expensive process [78]. Biological Pi removal is an alternative to chemical treatments in which bacteria accumulate excess Pi as polyphosphate (polyP) [79,80]. The bacteria can then be retained as sludge, which can be separated from the wastewater, which now has a much reduced phosphorous concentration.…”

Section: The Response To High Levels Of Extracellular Pimentioning

confidence: 99%

Molecular Mechanisms of Phosphate Homeostasis in <i>Escherichia coli</i>

McCleary¹

2017

≪i>Escherichia Coli

14
2
12
0

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Life's processes absolutely require inorganic phosphate for structural and energetic purposes. Escherichia coli has developed sophisticated mechanisms to acquire phosphate and to maintain intracellular amounts at optimal levels. The processes by which these simple cells maintain stable intracellular concentrations of phosphate are termed phosphate homeostasis, which involves mechanisms to balance the import, assimilation, sequestration, and export of phosphate. This chapter introduces the proteins involved in phosphate homeostasis and reviews information concerning the multiple phosphate transporters and the mechanisms by which they are regulated. It also introduces new concepts of how this bacterium responds to elevated extracellular levels of phosphate and presents a model for the integration of all of these processes to achieve homeostasis. The predominant importers are PitA, PitB, and the PstSCAB complex. Assimilation, or the incorporation of Pi into organic molecules, occurs primarily through the formation of ATP. Gene regulation relies on the PhoB/PhoR two-component system and the formation of a signaling complex at the membrane. The amount of intracellular phosphate can be fine-tuned through the formation or degradation of polyphosphate. Polyphosphate formation requires adequate supplies of ATP. In addition, when intracellular phosphate levels become too high, phosphate can be exported through PitA, PitB, or the YjbB transporters.

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“…Beyond specific yield, should algal fermentation be integrated into a WRRF, carboxylate speciation is equally, if not more, important. For example, research strongly supports that VFAs (specifically propionic acid) can enhance EBPR (Carvalheira et al, 2014;Shen and Zhou, 2016). Moreover, should polyhydroxyalkanoates production become a focus, a diverse array of carboxylic acids will result in a better-quality polymer (Anderson and Dawes, 1990;Dias et al, 2006).…”

Section: Resultsmentioning
confidence: 99%

Cofermenting Algal Biomass with Municipal Primary Solids to Enhance Carboxylate Production
Romenesko
¹
,
Coats
²

2018
Water Environment Research
5
0
6
0
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As water resource recovery facilities (WRRFs) implement biological nutrient removal (BNR) processes to remove excess wastewater nutrients, carboxylic acid demands increase; resource recovery processes (e.g., struvite, polyhydroxyalkanoate production) also demand carboxylates. In this regard, interest in algae to achieve tertiary treatment creates a new intraWRRF fermentation substrate. Indeed, fermentation potential tests indicated that algal augmentation could prove beneficial; carboxylate concentrations increased 31 % over primary solids. However, unexpectedly, and disproving a key research hypothesis, algal augmentation in a fed-batch fermenter decreased the production of carboxylic acids (26-34% at SRTs of 5-7 d); preliminary analyses suggest heterotrophic algae consumed carboxylates. Disproving a second research hypothesis, algal biomass did not significantly diversify carboxylate speciation. Finally, and unexpectedly, algal fermentation realized significant ammonia removal (39-96 % at SRTs of 5-7 d). Although decreased carboxylate yield is not desired, reduced ammonia load could potentially decrease WRRF energy demands and decrease carboxylic acid demands to achieve denitrification. Water Environ. Res., 90, 1997 (2018).

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Enhanced biological phosphorus removal with different carbon sources

Cited by 93 publications

References 66 publications

A Full-Scale Comparative Study of Conventional and Side-Stream Enhanced Biological Phosphorus Removal Processes

A Full-Scale Comparative Study of Conventional and Side-Stream Enhanced Biological Phosphorus Removal Processes

Molecular Mechanisms of Phosphate Homeostasis in <i>Escherichia coli</i>

Cofermenting Algal Biomass with Municipal Primary Solids to Enhance Carboxylate Production

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