Co-culture microorganisms with different initial proportions reveal the mechanism of chalcopyrite bioleaching coupling with microbial community succession. (January 2017)

• Record Type: Journal Article
• Authors: Ma, Liyuan; Wang, Xingjie; Feng, Xue; Liang, Yili; Xiao, Yunhua; Hao, Xiaodong; Yin, Huaqun; Liu, Hongwei; Liu, Xueduan
• Is Part Of: Bioresource technology. Volume 223(2017)
• Page Start: 121
• Page End: 130
• Publication Date: 2017-01
• Subjects: Chalcopyrite bioleaching -- Initial proportions -- Microbial community succession -- Iron/sulfur metabolism; 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.2016.10.056
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Effect of different initial microbial proportions on CuFeS2 bioleaching was studied. More sulfur oxidizers lead to higher Cu recovery than more ferrous oxidizers. Succession of free and attached cells with different initial proportions was studied. A model for CuFeS2 bioleaching was established coupling with community succession. Abstract: The effect of co-culture microorganisms with different initial proportions on chalcopyrite bioleaching was investigated. Communities were rebuilt by six typical strains isolated from the same habitat. The results indicated, by community with more sulfur oxidizers at both 30 and 40 °C, the final copper extraction rate was 19.8% and 6.5% higher, respectively, than that with more ferrous oxidizers. The variations of pH, redox potential, ferrous and copper ions in leachate also provided evidences that community with more sulfur oxidizers was more efficient. Community succession of free and attached cells revealed that initial proportions played decisive roles on community dynamics at 30 °C, while communities shared similar structures, not relevant to initial proportions at 40 °C. X-ray diffraction analysis confirmed different microbial functions on mineral surface. A mechanism model for chalcopyrite bioleaching was established coupling with community succession. This will provide theoretical basis for reconstructing an efficient community in industrial application.