Influence of ferrous ions on extracellular polymeric substances content and sludge dewaterability during bioleaching. (March 2015)

• Record Type: Journal Article
• Authors: Wong, Jonathan W.C.; Zhou, Jun; Kurade, Mayur B.; Murugesan, Kumarasamy
• Is Part Of: Bioresource technology. Volume 179(2015)
• Page Start: 78
• Page End: 83
• Publication Date: 2015-03
• Subjects: Acidithiobacillus ferrooxidans -- Bioleaching -- Extracellular polymeric substances -- Sewage sludge -- Sludge dewaterability; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2014.10.099
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Influence of pH and Fe 2+ was investigated on sludge dewaterability. Acid treatment improved dewaterability at pH 2.66. Bioleaching treatment was superior in dewaterability compared to acid treatment. Bioleaching enhanced the dewaterability by lowering of the sludge EPS content. Abstract: Pretreatment of activated sludge with sulfuric acid and bioleaching using Acidithiobacillus ferrooxidans along with addition of Fe 2+ 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 Fe 2+ and A. ferrooxidans . Ideal concentration of Fe 2+ was 2 g/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 Fe 2+ concentration, total EPS was reduced by 73%, enhancing sludge dewaterability. Bioleaching conducted by A. ferrooxidans could solubilized 88% Cu and 99% Zn within 120 h.