TY - JOUR
T1 - Recovery of palladium(II) by methanogenic granular sludge
AU - Pat-Espadas, Aurora M.
AU - Field, James A.
AU - Otero-Gonzalez, Lila
AU - Razo-Flores, Elías
AU - Cervantes, Francisco J.
AU - Sierra-Alvarez, Reyes
N1 - Funding Information:
Pat-Espadas thanks to CONACYT for the PhD fellowship number 221388 . FJC acknowledges the CONACYT grant 155656 . Authors would also like to thank Dr. T. Day, Dr. B. Beam Massani, and Dr. P. L. Anderson for valuable technical assistance with SEM and XRD analyses.
Publisher Copyright:
© 2015 Elsevier Ltd.
PY - 2016/2/1
Y1 - 2016/2/1
N2 - This is the first report that demonstrates the ability of anaerobic methanogenic granular sludge to reduce Pd(II) to Pd(0). Different electron donors were evaluated for their effectiveness in promoting Pd reduction. Formate and H2 fostered both chemically and biologically mediated Pd reduction. Ethanol only promoted the reduction of Pd(II) under biotic conditions and the reduction was likely mediated by H2 released from ethanol fermentation. No reduction was observed in biotic or abiotic assays with all other substrates tested (acetate, lactate and pyruvate) although a large fraction of the total Pd was removed from the liquid medium likely due to biosorption. Pd(II) displayed severe inhibition towards acetoclastic and hydrogenotrophic methanogens, as indicated by 50% inhibiting concentrations as low as 0.96 and 2.7 mg/L, respectively. The results obtained indicate the potential of utilizing anaerobic granular sludge bioreactor technology as a practical and promising option for Pd(II) reduction and recovery offering advantages over pure cultures.
AB - This is the first report that demonstrates the ability of anaerobic methanogenic granular sludge to reduce Pd(II) to Pd(0). Different electron donors were evaluated for their effectiveness in promoting Pd reduction. Formate and H2 fostered both chemically and biologically mediated Pd reduction. Ethanol only promoted the reduction of Pd(II) under biotic conditions and the reduction was likely mediated by H2 released from ethanol fermentation. No reduction was observed in biotic or abiotic assays with all other substrates tested (acetate, lactate and pyruvate) although a large fraction of the total Pd was removed from the liquid medium likely due to biosorption. Pd(II) displayed severe inhibition towards acetoclastic and hydrogenotrophic methanogens, as indicated by 50% inhibiting concentrations as low as 0.96 and 2.7 mg/L, respectively. The results obtained indicate the potential of utilizing anaerobic granular sludge bioreactor technology as a practical and promising option for Pd(II) reduction and recovery offering advantages over pure cultures.
KW - Anaerobic granular sludge
KW - Biosorption
KW - Chemical reduction
KW - Methanogenic inhibition
KW - Palladium bioreduction
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U2 - 10.1016/j.chemosphere.2015.09.035
DO - 10.1016/j.chemosphere.2015.09.035
M3 - Article
C2 - 26408982
AN - SCOPUS:84953790951
VL - 144
SP - 745
EP - 753
JO - Chemosphere
JF - Chemosphere
SN - 0045-6535
ER -