TY - JOUR
T1 - Influence of ferrous ions on extracellular polymeric substances content and sludge dewaterability during bioleaching
AU - Wong, Jonathan W.C.
AU - Zhou, Jun
AU - Kurade, Mayur B.
AU - Murugesan, Kumarasamy
N1 - Publisher Copyright:
© 2014 Elsevier Ltd.
PY - 2015/3/1
Y1 - 2015/3/1
N2 - Pretreatment of activated sludge with sulfuric acid and bioleaching using Acidithiobacillus ferrooxidans along with addition of Fe2+ on sludge dewaterability was investigated. The sludge dewatering efficiency in terms of capillary suction time (CST) and specific resistant to filtration (SRF) was increased with a decrease in sludge pH. A pH of 2.67 was found to be optimum for dewatering, at which 81% and 63% reduction of CST and SRF were achieved, respectively. The dewaterability of sludge was enhanced after the addition of Fe2+ and A. ferrooxidans. Ideal concentration of Fe2+ was 2g/L for sludge dewaterability, which showed 96% and 88% reduction in CST and SRF, respectively. In the control sludge, maximum part of the biopolymeric macromolecules was contributing by the tightly bound extracellular polymeric substances (TB-EPS). At optimum Fe2+ concentration, total EPS was reduced by 73%, enhancing sludge dewaterability. Bioleaching conducted by A. ferrooxidans could solubilized 88% Cu and 99% Zn within 120h.
AB - Pretreatment of activated sludge with sulfuric acid and bioleaching using Acidithiobacillus ferrooxidans along with addition of Fe2+ on sludge dewaterability was investigated. The sludge dewatering efficiency in terms of capillary suction time (CST) and specific resistant to filtration (SRF) was increased with a decrease in sludge pH. A pH of 2.67 was found to be optimum for dewatering, at which 81% and 63% reduction of CST and SRF were achieved, respectively. The dewaterability of sludge was enhanced after the addition of Fe2+ and A. ferrooxidans. Ideal concentration of Fe2+ was 2g/L for sludge dewaterability, which showed 96% and 88% reduction in CST and SRF, respectively. In the control sludge, maximum part of the biopolymeric macromolecules was contributing by the tightly bound extracellular polymeric substances (TB-EPS). At optimum Fe2+ concentration, total EPS was reduced by 73%, enhancing sludge dewaterability. Bioleaching conducted by A. ferrooxidans could solubilized 88% Cu and 99% Zn within 120h.
KW - Acidithiobacillus ferrooxidans
KW - Bioleaching
KW - Extracellular polymeric substances
KW - Sewage sludge
KW - Sludge dewaterability
UR - http://www.scopus.com/inward/record.url?scp=84918835347&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2014.10.099
DO - 10.1016/j.biortech.2014.10.099
M3 - 文章
C2 - 25528607
AN - SCOPUS:84918835347
SN - 0960-8524
VL - 179
SP - 78
EP - 83
JO - Bioresource Technology
JF - Bioresource Technology
ER -
