Influence of ferrous ions on extracellular polymeric substances content and sludge dewaterability during bioleaching

Jonathan W C WONG; Jun Zhou; Mayur B. Kurade; Kumarasamy Murugesan

doi:10.1016/j.biortech.2014.10.099

Influence of ferrous ions on extracellular polymeric substances content and sludge dewaterability during bioleaching

Jonathan W C WONG^*
, Jun Zhou
, Mayur B. Kurade
, Kumarasamy Murugesan

^*Corresponding author for this work

Department of Biology

Research output: Contribution to journal › Journal article › peer-review

78 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	78-83
Number of pages	6
Journal	Bioresource Technology
Volume	179
DOIs	https://doi.org/10.1016/j.biortech.2014.10.099
Publication status	Published - 1 Mar 2015

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SDG 7 Affordable and Clean Energy

User-Defined Keywords

Acidithiobacillus ferrooxidans
Bioleaching
Extracellular polymeric substances
Sewage sludge
Sludge dewaterability

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10.1016/j.biortech.2014.10.099

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title = "Influence of ferrous ions on extracellular polymeric substances content and sludge dewaterability during bioleaching",

abstract = "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.",

keywords = "Acidithiobacillus ferrooxidans, Bioleaching, Extracellular polymeric substances, Sewage sludge, Sludge dewaterability",

author = "WONG, \{Jonathan W C\} and Jun Zhou and Kurade, \{Mayur B.\} and Kumarasamy Murugesan",

note = "Funding Information: Authors thankfully acknowledge the financial support from the Innovation and Technology Support Programme (Project No. ITS/297/11 ), Innovation and Technology Commission, Hong Kong SAR Government.",

year = "2015",

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doi = "10.1016/j.biortech.2014.10.099",

language = "English",

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journal = "Bioresource Technology",

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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 - Funding Information: Authors thankfully acknowledge the financial support from the Innovation and Technology Support Programme (Project No. ITS/297/11 ), Innovation and Technology Commission, Hong Kong SAR Government.

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 - https://www.scopus.com/pages/publications/84918835347

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DO - 10.1016/j.biortech.2014.10.099

M3 - Journal article

C2 - 25528607

AN - SCOPUS:84918835347

SN - 0960-8524

VL - 179

SP - 78

EP - 83

JO - Bioresource Technology

JF - Bioresource Technology

ER -

Influence of ferrous ions on extracellular polymeric substances content and sludge dewaterability during bioleaching

Abstract

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