Isolation and characterization of a novel electricity-producing yeast, Candida sp. IR11. (September 2015)

• Record Type: Journal Article
• Authors: Lee, Yun-Yeong; Kim, Tae Gwan; Cho, Kyung-Suk
• Is Part Of: Bioresource technology. Volume 192(2015)
• Page Start: 556
• Page End: 563
• Publication Date: 2015-09
• Subjects: Candida sp. -- Electricity-producing yeast -- Microbial fuel cells -- Iron reduction; 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.2015.06.038
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: An iron-reducing yeast, Candida sp. IR11, was isolated from a MFC reactor. The pure culture of IR11 produced electricity from glucose in the MFC reactor. IR11 inoculation improved COD removal and electricity production in the MFC. IR11 played its biocatalystic capacity in the anodic biofilm of the MFC. IR11 is a suitable bio-resource for developing yeast-mediated MFC systems. Abstract: A novel iron-reducing yeast, Candida sp. IR11, was isolated from an anodic biofilm in a MFC reactor fed glucose as a feedstock. 200–250 mV of voltage was produced in the air–cathode MFC inoculated with a pure culture of the strain IR11 where glucose was supplied as a feedstock. When the strain IR11 was inoculated into a conventional MFC treating rejected wastewater from an upflow anaerobic sludge blanket, maximum power density and coulombic efficiency were enhanced from 15.2 ± 0.36 to 20.6 ± 1.52 mW m −2 and from 14.4 ± 0.45% to 21.9 ± 0.71%, respectively. In addition, the inoculation with IR11 improved COD removal from 79.1 ± 1.53% to 91.3 ± 5.29%. The quantitative PCR results showed that the strain IR11 successfully attached the anodic biofilm of the MFC reactors. These results indicate that Candida sp. IR11 is a promising biocatalyst for the enhancement of MFC performance.