title: Conversion of organic solid waste to hydrogen and methane by two-stage fermentation system with reuse of methane fermenter effluent as diluting water in hydrogen fermentation.
abstract: In this study, a two-stage system converting organic solid waste (food waste+sewage sludge) to H2 and CH4 was operated. In the first stage of dark fermentative hydrogen production (DFHP), a recently proposed method that does not require external inoculum, was applied. In the second stage, anaerobic sequencing batch reactor (ASBR) and an up-flow anaerobic sludge blanket reactor (UASBr) were followed to treat H2 fermenter effluent. (H2+CH4-ASBR) system showed better performance in terms of total biogas conversion (78.6%), while higher biogas production rate (2.03 L H2/Lsystem/d, 1.96 L CH4/Lsystem/d) was achieved in (H2+CH4-UASBr) system. To reduce the alkali addition requirement in DFHP process, CH4 fermenter effluent was tested as a diluting water. Both the ASBR and UASBr effluent was effective to keep the pH above 6 without CH4 production. In case of using ASBR effluent, H2 production dropped by 15%, but alkali addition requirement was reduced by 50%.
authors: Department of Civil and Environmental Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea.
authors: Kyung-Won
authors: KW
authors: Jung
authors: Chungman
authors: C
authors: Moon
authors: Si-Kyung
authors: SK
authors: Cho
authors: Sang-Hyoun
authors: SH
authors: Kim
authors: Hang-Sik
authors: HS
authors: Shin
authors: Dong-Hoon
authors: DH
authors: Kim
mesh_terms: D000468:Alkalies; D000641:Ammonia / Q000032:analysis; D000693:Anaerobiosis / Q000187:drug effects; D001673:Biodegradation, Environmental / Q000187:drug effects; D019149:Bioreactors / Q000382:microbiology; D003624:Darkness; D005285:Fermentation / Q000187:drug effects; D005502:Food; D006859:Hydrogen / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration / Q000187:drug effects; D006878:Hydroxides / Q000494:pharmacology; D008697:Methane / Q000378:metabolism*; D009930:Organic Chemicals / Q000378:metabolism*; D017680:Potassium Compounds / Q000494:pharmacology; D012722:Sewage / Q000382:microbiology; D062611:Solid Waste / Q000032:analysis*; D013997:Time Factors; D014865:Waste Disposal, Fluid; D014867:Water
chemical_list: D000468:Alkalies; D006878:Hydroxides; D009930:Organic Chemicals; D017680:Potassium Compounds; D012722:Sewage; D062611:Solid Waste; D014867:Water; D000641:Ammonia; D006859:Hydrogen; D008697:Methane; C029943:potassium hydroxide