title: Anaerobic digestion of Chinese cabbage waste silage with swine manure for biogas production: batch and continuous study.
abstract: The aim of this study was to investigate the potential for anaerobic co-digestion of Chinese cabbage waste silage (CCWS) with swine manure (SM). Batch and continuous experiments were carried out under mesophilic anaerobic conditions (36-38°C). The batch test evaluated the effect of CCWS co-digestion with SM (SM: CCWS=100:0; 25:75; 33:67; 0:100, % volatile solids (VS) basis). The continuous test evaluated the performance of a single stage completely stirred tank reactor with SM alone and with a mixture of SM and CCWS. Batch test results showed no significant difference in biogas yield up to 25-33% of CCWS; however, biogas yield was significantly decreased when CCWS contents in feed increased to 67% and 100%. When testing continuous digestion, the biogas yield at organic loading rate (OLR) of 2.0 g VSL⁻¹ d⁻¹ increased by 17% with a mixture of SM and CCWS (SM:CCWS=75:25) (423 mL g⁻¹ VS) than with SM alone (361 mL g⁻¹ VS). The continuous anaerobic digestion process (biogas production, pH, total volatile fatty acids (TVFA) and TVFA/total alkalinity ratios) was stable when co-digesting SM and CCWS (75:25) at OLR of 2.0 g VSL⁻¹ d⁻¹ and hydraulic retention time of 20 days under mesophilic conditions.
authors.affiliation: a Department of Biological and Agricultural Engineering , University of Idaho , ID , USA.
authors.forename: Gopi Krishna
authors.initials: GK
authors.lastname: Kafle
authors.forename: Sujala
authors.initials: S
authors.lastname: Bhattarai
authors.forename: Sang Hun
authors.initials: SH
authors.lastname: Kim
authors.forename: Lide
authors.initials: L
authors.lastname: Chen
mesh_terms: D000693:Anaerobiosis; D000818:Animals; D056804:Biofuels / Q000032:analysis*; D019149:Bioreactors; D001937:Brassica; D005232:Fatty Acids, Volatile / Q000032:analysis; D008372:Manure; D008697:Methane / Q000378:metabolism; D013552:Swine; D014866:Waste Products
chemical_list: D056804:Biofuels; D005232:Fatty Acids, Volatile; D008372:Manure; D014866:Waste Products; D008697:Methane
keywords: Chinese cabbage waste silage; anaerobic digestion; batch and continuous study; co-digestion; swine manure