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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Sulfate removal rate and metal recovery as settling precipitates in bioreactors: Influence of electron donors

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Author(s):
Costa, Rachel Biancalana [1] ; Gouvea Godoi, Leandro Augusto [2] ; Maluf Braga, Adriana Ferreira [2] ; Delforno, Tiago Palladino [3] ; Bevilaqua, Denise [1]
Total Authors: 5
Affiliation:
[1] Sao Paulo State Univ, Inst Chem, Dept Biochem & Organ Chem, R Francisco Degni 55, BR-14800060 Araraquara, SP - Brazil
[2] Univ Sao Paulo, Sao Carlos Sch Engn EESC, Dept Hydraul & Sanitat, Biol Proc Lab, Engn Ambiental Bloco 4-F, 1100 Joao Dagnone Av, BR-13563120 Sao Carlos, SP - Brazil
[3] Univ Fed Sao Carlos, Dept Biol, Lab Environm Microbiol, Rodovia Joao Leme Santos Km 110, BR-18052780 Sorocaba, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: JOURNAL OF HAZARDOUS MATERIALS; v. 403, FEB 5 2021.
Web of Science Citations: 7
Abstract

Four down-flow structured bed bioreactors were operated targeting biological sulfate-reduction and metal recovery. Three different electron donors were tested: glycerol (R1), lactate (R2), sucrose (R3), and a blend of the previous three (R4) with an increasing copper influent load (5, 15, and 30 mg Cu2+.L-1). Copper inhibited sulfate-reduction in R1 (15 mg Cu2+.L-1) and R3 (5 mg Cu2+.L-1), but the fermentative activity was not affected. R2 and R4 were not inhibited by the copper influent concentration. R2 provided the highest sulfate reduction rate (1767.3 +/- 240.1 mg SO42-.L.day(-1)). Nonetheless, the accumulation of settling precipitates was 22 % higher in R4 than in R2, indicating the former yielded the highest metal recovery as settling precipitates (24.8 g FSS.L-1, 25 % Fe2+, 5% Cu2+). 16S rRNA sequencing showed highest diversity of sulfate-reducing bacteria in R2. A predominance of sulfate-reducing and fermentative bacteria with more similarity was observed between microbial populations in R1 and R4, despite the difference in toxicity thresholds. Hence, the electron donor influenced not only the biological sulfate reduction, but also metal toxicity thresholds and metal recovery as settling precipitates. (AU)

FAPESP's process: 18/00213-8 - Dynamics of trace metals in vinasse anaerobic digestion: Effect of Ba supplementation
Grantee:Adriana Ferreira Maluf Braga
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 16/13603-3 - Electron donor influence in metal sulfide recovery from acid mine drainage
Grantee:Rachel Biancalana Costa
Support Opportunities: Scholarships in Brazil - Post-Doctoral