TY - JOUR
T1 - Microbial transformations by sulfur bacteria can recover value from phosphogypsum
T2 - A global problem and a possible solution
AU - Bounaga, Ayoub
AU - Alsanea, Anwar
AU - Lyamlouli, Karim
AU - Zhou, Chen
AU - Zeroual, Youssef
AU - Boulif, Rachid
AU - Rittmann, Bruce E.
N1 - Publisher Copyright:
© 2022 The Authors
PY - 2022/7/1
Y1 - 2022/7/1
N2 - Rising global population and affluence are increasing demands for food production and the phosphorus (P) fertilizers needed to grow that food. Essential are new approaches for managing the growing amount of phosphogypsum (PG) that is a by-product of phosphoric-acid production from phosphate rock. Today, only ~15% of the worldwide production of PG is recycled, mainly for agriculture and road construction. This review addresses microbial valorization of PG through strategies that apply sulfur-transforming bacteria: sulfate-reducing bacteria (SRB) and sulfur-oxidizing bacteria (SOB). The focus is on recovering elemental sulfur (S0), which can be used to make the sulfuric acid needed to produce phosphoric acid from rock phosphate. Our review provides in-depth understanding of the microbiological, chemical, and technological bases for microbial reclamation of S0 from PG. The review presents the principles and practices for sulfate leaching from PG, reduction of sulfate to sulfide by SRB, and oxidation of sulfide to S0 by SOB. The choice of electron donor for SRB, control of oxygen delivery to SOB, and nutrient requirements are emphasized. Although microorganism-based technologies for PG reclamation are far from mature, the efficiency of such SRB- and SOB-based processes has been documented at laboratory and industrial scales. This review should spur biotechnological advances toward recovering value from PG.
AB - Rising global population and affluence are increasing demands for food production and the phosphorus (P) fertilizers needed to grow that food. Essential are new approaches for managing the growing amount of phosphogypsum (PG) that is a by-product of phosphoric-acid production from phosphate rock. Today, only ~15% of the worldwide production of PG is recycled, mainly for agriculture and road construction. This review addresses microbial valorization of PG through strategies that apply sulfur-transforming bacteria: sulfate-reducing bacteria (SRB) and sulfur-oxidizing bacteria (SOB). The focus is on recovering elemental sulfur (S0), which can be used to make the sulfuric acid needed to produce phosphoric acid from rock phosphate. Our review provides in-depth understanding of the microbiological, chemical, and technological bases for microbial reclamation of S0 from PG. The review presents the principles and practices for sulfate leaching from PG, reduction of sulfate to sulfide by SRB, and oxidation of sulfide to S0 by SOB. The choice of electron donor for SRB, control of oxygen delivery to SOB, and nutrient requirements are emphasized. Although microorganism-based technologies for PG reclamation are far from mature, the efficiency of such SRB- and SOB-based processes has been documented at laboratory and industrial scales. This review should spur biotechnological advances toward recovering value from PG.
KW - Biotechnology
KW - Microbial valorization
KW - Phosphogypsyum (PG)
KW - Sulfate-reducing bacteria (SRB)
KW - Sulfur-oxidizing bacteria (SOB)
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U2 - 10.1016/j.biotechadv.2022.107949
DO - 10.1016/j.biotechadv.2022.107949
M3 - Review article
C2 - 35337932
AN - SCOPUS:85127103200
SN - 0734-9750
VL - 57
JO - Biotechnology Advances
JF - Biotechnology Advances
M1 - 107949
ER -