title: Evaluation of A Novel Split-Feeding Anaerobic/Oxic Baffled Reactor (A/OBR) For Foodwaste Anaerobic Digestate: Performance, Modeling and Bacterial Community.
abstract: To enhance the treatment efficiency from an anaerobic digester, a novel six-compartment anaerobic/oxic baffled reactor (A/OBR) was employed. Two kinds of split-feeding A/OBRs R2 and R3, with influent fed in the 1st, 3rdand 5thcompartment of the reactor simultaneously at the respective ratios of 6:3:1 and 6:2:2, were compared with the regular-feeding reactor R1 when all influent was fed in the 1stcompartment (control). Three aspects, the COD removal, the hydraulic characteristics and the bacterial community, were systematically investigated, compared and evaluated. The results indicated that R2 and R3 had similar tolerance to loading shock, but the R2 had the highest COD removal of 91.6% with a final effluent of 345 mg/L. The mixing patterns in both split-feeding reactors were intermediate between plug-flow and completely-mixed, with dead spaces between 8.17% and 8.35% compared with a 31.9% dead space in R1. Polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) analysis revealed that the split-feeding strategy provided a higher bacterial diversity and more stable bacterial community than that in the regular-feeding strategy. Further analysis indicated that Firmicutes, Bacteroidetes, and Proteobacteria were the dominant bacteria, among which Firmicutes and Bacteroidetes might be responsible for organic matter degradation and Proteobacteria for nitrification and denitrification.
authors.affiliation: Beijing Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, PR China.
authors.forename: Shaojie
authors.initials: S
authors.lastname: Wang
authors.affiliation: Beijing Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, PR China.
authors.forename: Liyu
authors.initials: L
authors.lastname: Peng
authors.affiliation: Beijing Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, PR China.
authors.forename: Yixin
authors.initials: Y
authors.lastname: Jiang
authors.affiliation: School of Environmental Engineering, Technical University of Crete, 73100, Chania, Greece.
authors.forename: Petros
authors.initials: P
authors.lastname: Gikas
authors.affiliation: Beijing Higher Institution Engineering Research Center of Environmental Pollution Control and Resource Utilization, Beijing University of Chemical Technology, No. 15 Beisanhuan East Road, Chaoyang District, Beijing 100029, PR China.
authors.forename: Baoning
authors.initials: B
authors.lastname: Zhu
authors.affiliation: Beijing Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, PR China.
authors.forename: Haijia
authors.initials: H
authors.lastname: Su
mesh_terms: D000693:Anaerobiosis / Q000235:genetics; D041963:Bacteroidetes / Q000145:classification / Q000235:genetics* / Q000378:metabolism; D019149:Bioreactors; D058440:Denitrification / Q000235:genetics; D000068536:Bacillota / Q000145:classification / Q000235:genetics* / Q000378:metabolism; D014644:Genetic Variation; D006801:Humans; D059013:Microbial Consortia / Q000235:genetics*; D010802:Phylogeny; D020560:Proteobacteria / Q000145:classification / Q000235:genetics* / Q000378:metabolism; D012336:RNA, Ribosomal, 16S / Q000235:genetics*; D012722:Sewage / Q000382:microbiology*; D014865:Waste Disposal, Fluid
chemical_list: D012336:RNA, Ribosomal, 16S; D012722:Sewage