title: A comprehensive microbial insight into two-stage anaerobic digestion of food waste-recycling wastewater.
abstract: Microbial community structures were assessed in a two-stage anaerobic digestion system treating food waste-recycling wastewater. The reactors were operated for 390 d at 10 different hydraulic retention times (HRTs) ranging from 25 to 4 d. Stable operation was achieved with the overall chemical oxygen demand (COD) removal efficiency of 73.0-85.9% at organic loading rate of up to 35.6 g COD/L·d. Performance of the acidogenic reactors, however, changed significantly during operation. This change coincided with transition of the bacterial community from one dominated by Aeriscardovia- and Lactobacillus amylovorus-related species to one dominated by Lactobacillus acetotolerans- and Lactobacillus kefiri-like organisms. In methanogenic reactors, the microbial community structures also changed at this stage along with the shift from Methanoculleus- to Methanosarcina-like organisms. This trend was confirmed by the non-metric multidimensional scaling joint plot of microbial shifts along with performance parameters. These results indicated that the overall process performance was relatively stable compared to the dynamic changes in the microbial structures and the acidogenic performance.
authors.affiliation: School of Environmental Science and Engineering, Pohang University of Science and Technology, Pohang, Gyeongbuk 790-784, South Korea.
authors.forename: Seung Gu
authors.initials: SG
authors.lastname: Shin
authors.forename: Gyuseong
authors.initials: G
authors.lastname: Han
authors.forename: Juntaek
authors.initials: J
authors.lastname: Lim
authors.forename: Changsoo
authors.initials: C
authors.lastname: Lee
authors.forename: Seokhwan
authors.initials: S
authors.lastname: Hwang
mesh_terms: D000693:Anaerobiosis; D001419:Bacteria / Q000235:genetics / Q000378:metabolism*; D019149:Bioreactors / Q000382:microbiology; D058645:Denaturing Gradient Gel Electrophoresis; D005502:Food; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D059027:Recycling / Q000379:methods*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014866:Waste Products / Q000032:analysis*
chemical_list: D012336:RNA, Ribosomal, 16S; D014866:Waste Products