title: Comparison of organic matter degradation and microbial community during thermophilic composting of two different types of anaerobic sludge.
abstract: Changes in organic matter degradation and microbial communities during thermophilic composting were compared using two different types of anaerobic sludge, one from mesophilic methane fermentation, containing a high concentration of proteins (S-sludge), and the other from thermophilic methane fermentation, containing high concentrations of lipids and fibers (K-sludge). The difference in the organic matter degradation rate corresponded to the difference in the organic matter constituents; the CO(2) evolution rate was greater in the composting of S-sludge than of K-sludge; moreover, the NH(3) evolution resulting from the protein degradation was especially higher in the composting of S-sludge. Then the differences in the microbial communities that contributed to each composting were determined by the PCR-DGGE method. Ureibacillus sp., which is known as a degrader with high organic matter degradation activity, was observed during the composting of S-sludge, whereas Thermobifida fusca, which is a well known thermophilic actinomycete that produces enzymes for lignocellulose degradation, were observed during the composting of K-sludge.
authors.affiliation: Department of Materials Science and Chemical Engineering, Shizuoka University, 3-5-1, Johoku, Naka-ku, Hamamatsu 432-8561, Japan. tcknaka@ipc.shizuoka.ac.jp
authors.forename: Kiyohiko
authors.initials: K
authors.lastname: Nakasaki
authors.forename: Le Thi Hong
authors.initials: le TH
authors.lastname: Tran
authors.forename: Yoshito
authors.initials: Y
authors.lastname: Idemoto
authors.forename: Michiharu
authors.initials: M
authors.lastname: Abe
authors.forename: Analiza Palenzuela
authors.initials: AP
authors.lastname: Rollon