title: Two-stage anaerobic digestion of tomato, cucumber, common reed and grass silage in leach-bed reactors and upflow anaerobic sludge blanket reactors.
abstract: Anaerobic digestion of tomato, cucumber, common reed and grass silage was studied in four separate two-stage reactor configuration consisting of leach bed reactor (LBR) and upflow anaerobic sludge blanket reactor (UASB). LBR studies showed that COD solubilization for cucumber and grass silage was higher (50%) than tomato (35%) and common reed (15%). Results also showed that 31-39% of initial TKN present in tomato and cucumber was solubilized in the leachates and 47-54% of the solubilized TKN was converted to NH(4)-N. The corresponding values for common reed and grass silage were 38-50% and 18-36%, respectively. Biomethanation of the leachates in UASB reactors resulted in methane yields of 0.03-0.14 m(3) CH(4) kg(-1)VS(fed) for the studied crop materials. Thus, high COD solubilization, high nitrogen mineralization and solubilization rates were feasible during anaerobic digestion of lignocellulosic materials in a two-stage LBR-UASB reactor system.
authors.affiliation: University of Jyväskylä, Department of Biological and Environmental Science, P.O. Box 35, FI-40014, Finland. pasjaga@jyu.fi
authors.forename: Padma Shanthi
authors.initials: PS
authors.lastname: Jagadabhi
authors.forename: Prasad
authors.initials: P
authors.lastname: Kaparaju
authors.forename: Jukka
authors.initials: J
authors.lastname: Rintala
mesh_terms: D001421:Bacteria, Anaerobic / Q000378:metabolism*; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D018553:Cucumis sativus; D008031:Lignin / Q000378:metabolism*; D018551:Solanum lycopersicum; D008697:Methane / Q000096:biosynthesis*; D006109:Poaceae; D012037:Refuse Disposal / Q000379:methods*; D012820:Silage
chemical_list: C036909:lignocellulose; D008031:Lignin; D008697:Methane