Click on “Download PDF” for the PDF version or on the title for the HTML version.
If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options.
Comparison of digestate from solid anaerobic digesters and effluent from liquid anaerobic digesters as inocula for solid state anaerobic digestion of yard trimming
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: 2015 ASABE Annual International Meeting 152190124.(doi:10.13031/aim.20152190124)
Authors: Fuqing Xu, Feng Wang, Yebo Li, Long Lin
Keywords: Biogas, methane, inoculation ratio, total solids content, wood chips, grass
Abstract. To select a proper inoculation method for the solid state anaerobic digestion of yard trimming with increased methane yield and stability, digestate from solid state anaerobic digesters and dewatered effluent from liquid anaerobic digesters were compared as inocula under different substrate-to-inoculum (S/I) ratios from 0.2 to 2, and total solids (TS) contents from 20% to 35%. The highest methane yield of around 244 L/kgVSfeed was obtained at an S/I of 0.2 and TS content of 20% for both types of inocula. The highest volumetric methane productivity was obtained with dewatered effluent at an S/I ratio of 0.6 and TS content of 24%. The two types of inocula were found to be comparable for methane yields and volumetric methane productivities at each S/I ratio, while using dewatered effluent as inoculum reduced the startup time. S/I ratio of 1 was a critical level and should be set as the upper limit of the inoculation ratio for mesophilic SS-AD of yard trimming.(Download PDF) (Export to EndNotes)