title: Coproduction of hydrogen and methane via anaerobic fermentation of cornstalk waste in continuous stirred tank reactor integrated with up-flow anaerobic sludge bed.
abstract: A 10 L continuous stirred tank reactor (CSTR) system was developed for a two-stage hydrogen fermentation process with an integrated alkaline treatment. The maximum hydrogen production rate reached 218.5 mL/L h at a cornstalk concentration of 30 g/L, and the total hydrogen yield and volumetric hydrogen production rate reached 58.0 mL/g-cornstalk and 0.55-0.57 L/L d, respectively. A 10 L up-flow anaerobic sludge bed (UASB) was used for continuous methane fermentation of the effluents obtained from the two-stage hydrogen fermentation. At the optimal organic loading rate of 15.0 g-COD/Ld, the COD removal efficiency and volumetric biogas production rate reached 83.3% and 4.6L/Ld, respectively. Total methane yield reached 200.9 mL/g-cornstalk in anaerobic fermentation with the effluents and alkaline hydrolysate. As a result, the total energy recovery by coproduction of hydrogen and methane with anaerobic fermentation of cornstalk reached 67.1%.
authors.affiliation: National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China.
authors.forename: Xi-Yu
authors.initials: XY
authors.lastname: Cheng
authors.forename: Qian
authors.initials: Q
authors.lastname: Li
authors.forename: Chun-Zhao
authors.initials: CZ
authors.lastname: Liu
mesh_terms: D001421:Bacteria, Anaerobic / Q000378:metabolism*; D061249:Batch Cell Culture Techniques / Q000295:instrumentation*; D019149:Bioreactors / Q000382:microbiology*; D005285:Fermentation; D006859:Hydrogen / Q000302:isolation & purification / Q000378:metabolism*; D007220:Industrial Waste / Q000517:prevention & control*; D008697:Methane / Q000302:isolation & purification / Q000378:metabolism*; D035261:Plant Components, Aerial / Q000382:microbiology*; D012399:Rotation; D018511:Systems Integration; D003313:Zea mays / Q000382:microbiology*
chemical_list: D007220:Industrial Waste; D006859:Hydrogen; D008697:Methane