The performance and mechanism of simultaneous removal of fluoride, calcium, and nitrate by calcium precipitating strain Acinetobacter sp. H12.

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ID: 81720
2020
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Abstract
A calcium precipitating and denitrifying bacterium H12 was used to investigate the F removal performance and mechanism. The results showed that the strain H12 reduced 85.24% (0.036 mg·L·h) of F, 62.43% (0.94 mg·L·h) of Ca, and approximately 100% of NO over 120 h in continuous determination experiments. The response surface methodology analysis demonstrated that the maximum removal efficiency of F was 88.98% (0.062 mg·L·h) within 72 h under the following conditions: the initial Ca concentration of 250.00 mg·L, pH of 7.50, and the initial CHNaO·6HO concentration of 800.00 mg·L. The scanning electron microscopy images, the X-ray photoelectron spectroscopy, and X-ray diffraction results suggested the following removal mechanism of F: (1) the bacteria, as the nucleation site, were encapsulated by bioprecipitation to form biological crystal seeds; (2) Biological crystal seeds adsorbed F to form Ca(PO)F and CaF; (3) Under the induction of bacteria, calcium, fluoride and phosphate coprecipitated to form Ca(PO)F and CaF. In addition, the gas chromatography data indicated that F had little or no effect on the gas composition during denitrification, and the fluorescence spectroscopy analysis also proved that the extracellular polymeric substance (protein) is the site of bioprecipitation nucleation.
Reference Key
su2020theecotoxicology Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Su, Jun Feng;Zhang, Han;Huang, Ting Lin;Hu, Xiao Fen;Chen, Chang Lun;Liu, Jia Ran;
Journal Ecotoxicology and environmental safety
Year 2020
DOI
S0147-6513(19)31186-8
URL
Keywords
nitrate ca(2+) response surface methodology (rsm) f(−) micp acinetobacter sp

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