Bioaugmentation coupled with phytoextraction for the treatment of Cd and Sr, and reuse opportunities for phosphogypsum rare earth elements

JOURNAL OF HAZARDOUS MATERIALS

卷:399

Article

Jalali, Jihen^1,2,3  Gaudin, Pierre¹  Ammar, Emna²  Lebeau, Thierry¹ 

[1] Fac Sci & Technol Nantes, CNRS, UMR 6112, Lab Planetol & Geodynam Nantes, BP 92208, F-44322 Nantes 3, France

[2] Univ Sfax, Natl Engn Sch Sfax, Lab Environm Sci & Sustainable Dev LASED, BP 1173, Sfax 3038, Tunisia

[3] Tunisian Chem Grp, Mdhilla Gafsa Facil, BP 215, Gafsa 2100, Tunisia

关键词: Bioremediation;    Lanthanum;    Metal trace elements;    Phytostabilization;    Yttrium;   

DOI  :  10.1016/j.jhazmat.2020.122821

来源: Elsevier

【 摘 要 】

The environmental and health impacts caused by phosphogypsum (PG) make it necessary to carefully manage these wastes. Bioaugmentation of a PG-compost mix with Bacillus cereus was associated with Trifolium pratense or Helianthus annuus for the phytoextraction of metal trace elements (MTE). In hydroponics, MTE concentrations in sunflower shoots are higher than in clover; however, as opposed to clover, it regulates their accumulation. The MTE accumulation levels by plants cultivated in pots with the PG-compost mix are much lower than in hydroponics due to lower concentration in available MTE. The bacteria-plant coupling has served to raise MTE concentrations, especially for rare earth elements (REE), i.e., Ce, La, Nd, Y, in the AP of sunflower, by factors of 4.4, 38.3, 3.4 and 21, respectively, compared to non-bioaugmented control. The translocation factor was also increased for all MTE and is ranged between 1.1 for Sr and 6.8 for Y. Moreover, the presence of bacteria raises plant biomass by a factor of 3.7 for shoots and 2.9 for the roots as regards clover. Results showed that in addition to phytoextraction of REE elements, all providing the promise of some kind of economic opportunity, the dispersion of PG stockpiles dust and erosion should be reduced.

【 授权许可】

Free