期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 799, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.149261
关键词
Biomineralization; Struvite; Phosphorus recovery; Intracellular cluster; Municipal wastewater
This study investigated the mechanisms of struvite production by biomineralization in municipal wastewater for five microorganisms, revealing different pathways for bio-struvite formation. Nutrient recovery through biomineralization has the potential to promote circularity within the wastewater industry, with various microorganisms showing promise for ortho-phosphate removal and bio-struvite generation.
The mechanisms of struvite production by biomineralization were investigated for five microorganisms (Bacillus pumilus, Brevibacterium antiquum, Myxococcus xanthus, Halobacterium salinarum and Idiomarina loihiensis) in mu-nicipal wastewater. The microbial exponential phase of growth occurred within the first 48 h of incubation, with growth rates varying from 0.02-0.08 1/h. These five microorganisms removed 23-27 mg/L (66-79%) of ortho-phosphate from wastewater, which was recovered as biological struvite (i.e., bio-struvite) identified by morpho-logical, X-ray diffraction and elemental analysis. Bio-struvite crystals occurred in a low extracellular supersatura-tion index (0.6-0.8 units). Bio-struvite formation in B. pumilus M. xanthus, H. salinarum cultures was linked to biologically induced mineralization. Whereas B. antiquum and I. loihiensis produced bio-struvite through biolog-ically controlled mineralization mechanism because the crystals presented homogeneity in morphology and size, and intracellular vesicle-like cell structures were observed enclosing electron-dense granules/materials. Nutrient recovery through biomineralization has potential application in wastewater streams promoting circularity within the wastewater industry. (c) 2021 Elsevier B.V. All rights reserved.
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