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http://dx.doi.org/10.7845/kjm.2012.48.2.125

Microbial Diversity in Three-Stage Methane Production Process Using Food Waste  

Nam, Ji-Hyun (Energy and Environment Fusion Technology Center, Myongji University)
Kim, Si-Wouk (Department of Environmental Engineering, Chosun University)
Lee, Dong-Hun (Department of Microbiology, Chungbuk National University)
Publication Information
Korean Journal of Microbiology / v.48, no.2, 2012 , pp. 125-133 More about this Journal
Abstract
Anaerobic digestion is an alternative method to digest food wastes and to produce methane that can be used as a renewable energy source. We investigated bacterial and archaeal community structures in a three-stage methane production process using food wastes with concomitant wastewater treatment. The three-stage methane process is composed of semianaerobic hydrolysis/acidogenic, anaerobic acidogenic, and strictly anaerobic methane production steps in which food wastes are converted methane and carbon dioxide. The microbial diversity was determined by the nucleotide sequences of 16S rRNA gene library and quantitative real-time PCR. The major eubacterial population of the three-stage methane process was belonging to VFA-oxidizing bacteria. The archaeal community consisted mainly of two species of hydrogenotrophic methanogen (Methanoculleus). Family Picrophilaceae (Order Thermoplasmatales) was also observed as a minor population. The predominance of hydrogenotrophic methanogen suggests that the main degradation pathway of this process is different from the classical methane production systems that have the pathway based on acetogenesis. The domination of hydrogenotrophic methanogen (Methanoculleus) may be caused by mesophilic digestion, neutral pH, high concentration of ammonia, short HRT, and interaction with VFA-oxidizing bacteria (Tepidanaerobacter etc.).
Keywords
archaeal diversity; bacterial diversity; hydrogenotrophic methanogen; three-stage methane production process; VFA-oxidizing bacteria;
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