title: Co-production of hydrogen and methane from herbal medicine wastewater by a combined UASB system with immobilized sludge (H2 production) and UASB system with suspended sludge (CH4 production).
abstract: An upflow anaerobic sludge bed (UASB) system with sludge immobilized on granular activated carbon was developed for fermentative hydrogen production continuously from herbal medicine wastewater at various organic loading rates (8-40 g chemical oxygen demand (COD) L(-1) d(-1)). The maximum hydrogen production rate reached 10.0 (±0.17) mmol L(-1) hr(-1) at organic loading rate of 24 g COD L(-1) d(-1), which was 19.9% higher than that of suspended sludge system. The effluents of hydrogen fermentation were used for continuous methane production in the subsequent UASB system. At hydraulic retention time of 15 h, the maximum methane production rate of 5.49 (±0.03) mmol L(-1) hr(-1) was obtained. The total energy recovery rate by co-production of hydrogen and methane was evaluated to be 7.26 kJ L(-1) hr(-1).
authors.affiliation: Center for Ecological Research, Northeast Forestry University, Harbin 150040, China.
authors.forename: Caiyu
authors.initials: C
authors.lastname: Sun
authors.affiliation: Management College, Ocean University of China, QingDao 266000, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Hao
authors.affiliation: School of Forestry, Northeast Forestry University, Harbin 150040, China E-mail: dr_lyf@163.com.
authors.forename: Bida
authors.initials: B
authors.lastname: Qin
authors.affiliation: School of Forestry, Northeast Forestry University, Harbin 150040, China E-mail: dr_lyf@163.com.
authors.forename: Bing
authors.initials: B
authors.lastname: Wang
authors.affiliation: School of Forestry, Northeast Forestry University, Harbin 150040, China E-mail: dr_lyf@163.com.
authors.forename: Xueying
authors.initials: X
authors.lastname: Di
authors.affiliation: School of Forestry, Northeast Forestry University, Harbin 150040, China E-mail: dr_lyf@163.com.
authors.forename: Yongfeng
authors.initials: Y
authors.lastname: Li
mesh_terms: D056804:Biofuels; D019149:Bioreactors; D005285:Fermentation; D029001:Herbal Medicine; D006859:Hydrogen / Q000378:metabolism*; D008697:Methane / Q000378:metabolism*; D012722:Sewage; D062065:Wastewater
chemical_list: D056804:Biofuels; D006859:Hydrogen; D008697:Methane; D012722:Sewage; D062065:Wastewater