Understanding the mechanisms of biological struvite biomineralisation

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dc.contributor.authorLeng, Yirong
dc.contributor.authorSoares, Ana
dc.date.accessioned2021-06-04T10:30:15Z
dc.date.available2021-06-04T10:30:15Z
dc.date.issued2021-05-25
dc.description.abstractThe mechanisms of struvite production through biomineralisation were investigated for five microorganisms (Bacillus pumilus, Brevibacterium antiquum, Myxococcus xanthus, Halobacterium salinarum and Idiomarina loihiensis). After 72–96 h of incubation, the microbial strains tested increased the solution pH from 7.5 to 7.7 to 8.4–8.7, and removed ortho-phosphate (63–71%) and magnesium (94–99%) by biomineralisation. The minerals formed were identified as struvite (i.e. bio-struvite). Within the initial 24 h of incubation, microbial growth rates of 0.16–0.28 1/h were measured, and bio-struvite production was observed when the solution supersaturation index with respect to struvite achieved 0.6–0.8 units. The crystals produced by B. pumilus, H. salinarum and M. xanthus were thin trapezoidal-platy shaped and presented a gap size about 200 μm for intervals between cumulative volume undersize distribution at 50% and 90%. While B. antiquum and I. loihiensis produced crystals of coffin-lid/long-bar shape and a narrow size gap around 100 μm for intervals between cumulative volume percentage of 50% and 90%, indicating homogeneous crystal size distribution. Intracellular supersaturation of struvite phase was achieved within B. antiquum and I. loihiensis cells, corresponding to observation of intracellular vesicle-like structures occupied with electron-dense granules/materials. This study suggests that B. antiquum and I. loihiensis produced bio-struvite through biologically controlled mineralisation. This mechanism is the preferred for recovering nutrients from streams such as wastewater because it allows a link between manipulation of microbial growth conditions and bio-struvite production, even in highly complex streams like wastewater.en_UK
dc.identifier.citationLeng Y, Soares A. (2021) Understanding the mechanisms of biological struvite biomineralisation. Chemosphere, Volume 281, October 2021, Article number 130986en_UK
dc.identifier.issn0045-6535
dc.identifier.urihttps://doi.org/10.1016/j.chemosphere.2021.130986
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/16734
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectIntracellular clusteren_UK
dc.subjectPhosphorus recoveryen_UK
dc.subjectBio-struviteen_UK
dc.subjectBiomineralisationen_UK
dc.titleUnderstanding the mechanisms of biological struvite biomineralisationen_UK
dc.typeArticleen_UK

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