title: Performance of anaerobic membrane bioreactor during digestion and thickening of aerobic membrane bioreactor excess sludge.
abstract: In this study, we evaluated the performance of an anaerobic membrane bioreactor in terms of digestion and thickening of excess sludge from an aerobic membrane bioreactor. A digestion reactor equipped with an external polytetrafluoroethylene tubular microfiltration membrane module was operated in semi-batch mode. Solids were concentrated by repeated membrane filtration and sludge feeding, and their concentration reached 25,400mg/L after 92d. A high chemical oxygen demand (COD) removal efficiency, i.e., 98%, was achieved during operation. A hydraulic retention time of 34d and a pulse organic loading rate of 2200mg-COD/(L-reactor) gave a biogas production rate and biogas yield of 1.33L/(reactor d) and 0.08L/g-CODinput, respectively. The external membrane unit worked well without membrane cleaning for 90d. The transmembrane pressure reached 25kPa and the filtration flux decreased by 80% because of membrane fouling after operation for 90d.
authors.affiliation: Department of Integrated Science and Engineering for Sustainable Society, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan. Electronic address: hafuka.14p@g.chuo-u.ac.jp.
authors.forename: Akira
authors.initials: A
authors.lastname: Hafuka
authors.affiliation: Technical Research & Development Institute, Sanki Engineering Co., Ltd., 1742-7 Shimotsuruma, Yamato-shi, Kanagawa 242-0001, Japan.
authors.forename: Kazuhisa
authors.initials: K
authors.lastname: Mimura
authors.affiliation: Division of Civil and Environmental Engineering, Graduate School of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan.
authors.forename: Qing
authors.initials: Q
authors.lastname: Ding
authors.affiliation: Department of Integrated Science and Engineering for Sustainable Society, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Yamamura
authors.affiliation: Division of Environmental Engineering, Graduate School of Engineering, Hokkaido University, North-13, West-8, Sapporo 060-8628, Japan.
authors.forename: Hisashi
authors.initials: H
authors.lastname: Satoh
authors.affiliation: Research and Development Initiatives, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan.
authors.forename: Yoshimasa
authors.initials: Y
authors.lastname: Watanabe
mesh_terms: D000693:Anaerobiosis; D056804:Biofuels; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D001709:Biotechnology / Q000379:methods*; D005374:Filtration; D005740:Gases; D006868:Hydrolysis; D008567:Membranes, Artificial; D012722:Sewage / Q000737:chemistry*
chemical_list: D056804:Biofuels; D005740:Gases; D008567:Membranes, Artificial; D012722:Sewage
keywords: Anaerobic digestion; Excess sludge; Membrane filtration; Microfiltration; Tubular PTFE membrane module