A biological process effective for the conversion of CO-containing industrial waste gas to acetate. (July 2016)

• Record Type: Journal Article
• Authors: Kim, Tae Wan; Bae, Seung Seob; Lee, Jin Woo; Lee, Sung-Mok; Lee, Jung-Hyun; Lee, Hyun Sook; Kang, Sung Gyun
• Is Part Of: Bioresource technology. Volume 211(2016)
• Page Start: 792
• Page End: 796
• Publication Date: 2016-07
• Subjects: Steel mill waste gas -- Thermococcus onnurineus -- Thermoanaerobacter kivui -- Gas fermentation -- Two-stage culture; 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.2016.04.038
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: A two-stage culture consisting of carboxydotrophic archaea and homoacetogenic bacteria is proposed. The inhibitory effect of CO to an acetogen was measured. The conversion of LDG gas containing ca. 56% CO derived from steel-mill process was demonstrated by the two-stage culture. Abstract: Acetogens have often been observed to be inhibited by CO above an inhibition threshold concentration. In this study, a two-stage culture consisting of carboxydotrophic archaea and homoacetogenic bacteria is found to be effective in converting industrial waste gas derived from a steel mill process. In the first stage, Thermococcus onnurineus could grow on the Linz-Donawitz converter gas (LDG) containing ca. 56% CO as a sole energy source, converting the CO into H2 and CO2 . Then, in the second stage, Thermoanaerobacter kivui could grow on the off-gas from the first stage culture, consuming the H2 and CO in the off-gas completely and producing acetate as a main product. T. kivui alone could not grow on the LDG gas. This work represents the first demonstration of acetate production using steel mill waste gas by a two-stage culture of carboxydotrophic hydrogenogenic microbes and homoacetogenic bacteria.