TY - JOUR
T1 - Degradation of inhibitory substances in sludge by Galactomyces sp. Z3 and the role of its extracellular polymeric substances in improving bioleaching
AU - Zhou, Jun
AU - Zheng, Guanyu
AU - WONG, Jonathan W C
AU - Zhou, Lixiang
N1 - Funding Information:
The authors would like to acknowledge the financial support from the Innovative Technology Fund, Hong Kong SAR (Reference number: ITS/297/11) and the National Natural Scientific Foundation of China ( 21177060 ).
PY - 2013/3
Y1 - 2013/3
N2 - This study sought to elucidate the effect and mechanism of Galactomyces sp. Z3 in improving the bioleaching of heavy metals from sludge. Results showed that co-inoculation of Galactomyces sp. Z3 and two Acidithiobacillus strains (Acidithiobacillus ferrooxidans LX5 and Acidithiobacillus thiooxidans TS6) reduced the period required for sludge bioleaching by 4.5days compared to Acidithiobacillus alone. Further, removal efficiencies of Cu, Zn and oxidation rate of Fe2+ and S0 were higher in co-inoculation system than the Acidithiobacillus alone. Galactomyces sp. Z3 consumed the acetate, propionate, iso-butyrate, butyrate, and iso-valerate in sludge from the initial concentrations of 109.50, 28.80, 7.70, 34.30, and 18.40mg/L to 10.20, 0.61, 0.63, 19.40 and 1.30mg/L, respectively, after 12h in the co-inoculation system, significantly lower than the concentrations observed in the Acidithiobacillus alone. Meanwhile, the surfactant properties of the extracellular polymeric substances produced by the Galactomyces accelerated the rate of sulfur oxidization by A. thiooxidans.
AB - This study sought to elucidate the effect and mechanism of Galactomyces sp. Z3 in improving the bioleaching of heavy metals from sludge. Results showed that co-inoculation of Galactomyces sp. Z3 and two Acidithiobacillus strains (Acidithiobacillus ferrooxidans LX5 and Acidithiobacillus thiooxidans TS6) reduced the period required for sludge bioleaching by 4.5days compared to Acidithiobacillus alone. Further, removal efficiencies of Cu, Zn and oxidation rate of Fe2+ and S0 were higher in co-inoculation system than the Acidithiobacillus alone. Galactomyces sp. Z3 consumed the acetate, propionate, iso-butyrate, butyrate, and iso-valerate in sludge from the initial concentrations of 109.50, 28.80, 7.70, 34.30, and 18.40mg/L to 10.20, 0.61, 0.63, 19.40 and 1.30mg/L, respectively, after 12h in the co-inoculation system, significantly lower than the concentrations observed in the Acidithiobacillus alone. Meanwhile, the surfactant properties of the extracellular polymeric substances produced by the Galactomyces accelerated the rate of sulfur oxidization by A. thiooxidans.
KW - Acidithiobacillus sp.
KW - Bioleaching
KW - Extracellular polymeric substances
KW - Galactomyces sp. Z3
KW - Sewage sludge
UR - http://www.scopus.com/inward/record.url?scp=84873650323&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2012.12.179
DO - 10.1016/j.biortech.2012.12.179
M3 - Journal article
AN - SCOPUS:84873650323
SN - 0960-8524
VL - 132
SP - 217
EP - 223
JO - Bioresource Technology
JF - Bioresource Technology
ER -
