TY - JOUR
T1 - Influence of pH and natural organic matter on zinc biosorption in a model lignocellulosic biofuel biorefinery effluent
AU - Palumbo, Amanda J.
AU - Daughney, Christopher J.
AU - Slade, Alison H.
AU - Glover, Chris N.
PY - 2013/10
Y1 - 2013/10
N2 - The effect of dissolved natural organic matter (NOM) and pH on microbial biosorption of Zn was evaluated in a model lignocellulosic biofuel refinery effluent rich in NOM. Batch culture experiments conducted with two model microorganisms (yeast, Candida tropicalis; bacteria Novosphingobium nitrogenifigens Y88T), showed an inhibitory effect of NOM, and an optimum pH for Zn removal at 7.5-8.0. Membrane bioreactors with mixed autochthonous organisms were operated at pH 6.5 and pH 8.0 to better simulate real-world remediation scenarios. More Zn was removed at the high (91%) than at the low (26%) pH, presumably because the higher pH freed negatively-charged functional groups on the cellular biomass for passive Zn binding. Manipulating the pH of bioreactors can significantly improve metal removal in NOM rich wastewater. Such reactors could maintain water quality for closed-cycle biorefineries, leading to reduced water consumption, and a more sustainable biofuel.
AB - The effect of dissolved natural organic matter (NOM) and pH on microbial biosorption of Zn was evaluated in a model lignocellulosic biofuel refinery effluent rich in NOM. Batch culture experiments conducted with two model microorganisms (yeast, Candida tropicalis; bacteria Novosphingobium nitrogenifigens Y88T), showed an inhibitory effect of NOM, and an optimum pH for Zn removal at 7.5-8.0. Membrane bioreactors with mixed autochthonous organisms were operated at pH 6.5 and pH 8.0 to better simulate real-world remediation scenarios. More Zn was removed at the high (91%) than at the low (26%) pH, presumably because the higher pH freed negatively-charged functional groups on the cellular biomass for passive Zn binding. Manipulating the pH of bioreactors can significantly improve metal removal in NOM rich wastewater. Such reactors could maintain water quality for closed-cycle biorefineries, leading to reduced water consumption, and a more sustainable biofuel.
KW - Bioavailability
KW - Bioremediation
KW - Closed cycle mills
KW - Heavy metals
KW - Membrane bioreactors
UR - http://www.scopus.com/inward/record.url?scp=84881486927&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2013.07.053
DO - 10.1016/j.biortech.2013.07.053
M3 - Journal Article
C2 - 23933024
AN - SCOPUS:84881486927
SN - 0960-8524
VL - 146
SP - 169
EP - 175
JO - Bioresource Technology
JF - Bioresource Technology
ER -
