title: A bioelectrochemical reactor containing carbon fiber textiles enables efficient methane fermentation from garbage slurry.
abstract: A packed-bed system includes supporting materials to retain microorganisms and a bioelectrochemical system influences the microbial metabolism. In our study, carbon fiber textiles (CFT) as a supporting material was attached onto a carbon working electrode in a bioelectrochemical reactor (BER) that degrades garbage slurry to methane, in order to investigate the effect of combining electrochemical regulation and packing CFT. The potential on the working electrode in the BER containing CFT was set to -1.0 V or -0.8 V (vs. Ag/AgCl). BERs containing CFT exhibited higher methane production, elimination of dichromate chemical oxygen demand, and the ratio of methanogens in the suspended fraction than reactors containing CFT without electrochemical regulation at an organic loading rate (OLR) of 27.8 gCODcr/L/day. In addition, BERs containing CFT exhibited higher reactor performances than BERs without CFT at this OLR. Our results revealed that the new design that combined electrochemical regulation and packing CFT was effective.
authors.affiliation: Biotechnology Sector, Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko-shi, Chiba-ken 270-1194, Japan.
authors.forename: Kengo
authors.initials: K
authors.lastname: Sasaki
authors.forename: Masahiko
authors.initials: M
authors.lastname: Morita
authors.forename: Daisuke
authors.initials: D
authors.lastname: Sasaki
authors.forename: Shin-ichi
authors.initials: S
authors.lastname: Hirano
authors.forename: Norio
authors.initials: N
authors.lastname: Matsumoto
authors.forename: Atsushi
authors.initials: A
authors.lastname: Watanabe
authors.forename: Naoya
authors.initials: N
authors.lastname: Ohmura
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Igarashi
mesh_terms: D001105:Archaea / Q000235:genetics / Q000378:metabolism; D019149:Bioreactors; D002244:Carbon / Q000737:chemistry*; D000077482:Carbon Fiber; D004560:Electricity; D055664:Electrochemical Techniques / Q000295:instrumentation*; D004566:Electrodes; D005285:Fermentation / Q000502:physiology*; D005735:Garbage; D005740:Gases / Q000032:analysis; D018628:Gene Dosage / Q000235:genetics; D008697:Methane / Q000378:metabolism*; D012150:Polymorphism, Restriction Fragment Length; D011387:Prokaryotic Cells / Q000378:metabolism; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012722:Sewage / Q000382:microbiology*; D013784:Textiles; D013997:Time Factors
chemical_list: D000077482:Carbon Fiber; D005740:Gases; D012336:RNA, Ribosomal, 16S; D012722:Sewage; D002244:Carbon; D008697:Methane