title: Comparison of solid-state anaerobic digestion and composting of yard trimmings with effluent from liquid anaerobic digestion.
abstract: Solid-state anaerobic digestion (SS-AD) and composting of yard trimmings with effluent from liquid AD were compared under thermophilic condition. Total solids (TS) contents of 22%, 25%, and 30% were studied for SS-AD, and 35%, 45%, and 55% for composting. Feedstock/effluent (F/E) ratios of 2, 3, 4, 5, and 6 were tested. In composting, the greatest carbon loss was obtained at 35% TS, which was 2-3 times of that at 55% TS and was up to 50% higher than that in SS-AD. In SS-AD, over half of the degraded carbon was converted to methane with the greatest methane yield of 121 L/kg VS(feedstock). Methane production from SS-AD was low at F/E ratios of 2 and 3, likely due to the inhibitory effect of high concentrations of ammonia nitrogen (up to 5.6g/kg). The N-P-K values were similar for SS-AD digestate and compost with different dominant nitrogen forms.
authors: Department of Food, Agricultural and Biological Engineering, The Ohio State University, Ohio Agricultural Research and Development Center, 1680 Madison Ave., Wooster, OH 44691, USA; Environmental Science Graduate Program, The Ohio State University, 3138A Smith Lab, 174 West 18th, Columbus, OH 43210, USA.
authors: Long
authors: L
authors: Lin
authors: Department of Food, Agricultural and Biological Engineering, The Ohio State University, Ohio Agricultural Research and Development Center, 1680 Madison Ave., Wooster, OH 44691, USA.
authors: Liangcheng
authors: L
authors: Yang
authors: Department of Food, Agricultural and Biological Engineering, The Ohio State University, Ohio Agricultural Research and Development Center, 1680 Madison Ave., Wooster, OH 44691, USA; Environmental Science Graduate Program, The Ohio State University, 3138A Smith Lab, 174 West 18th, Columbus, OH 43210, USA.
authors: Fuqing
authors: F
authors: Xu
authors: Department of Food, Agricultural and Biological Engineering, The Ohio State University, Ohio Agricultural Research and Development Center, 1680 Madison Ave., Wooster, OH 44691, USA.
authors: Frederick C
authors: FC
authors: Michel
authors: Department of Food, Agricultural and Biological Engineering, The Ohio State University, Ohio Agricultural Research and Development Center, 1680 Madison Ave., Wooster, OH 44691, USA. Electronic address: li.851@osu.edu.
authors: Yebo
authors: Y
authors: Li
mesh_terms: D000641:Ammonia / Q000032:analysis; D000693:Anaerobiosis; D019149:Bioreactors / Q000382:microbiology; D002245:Carbon Dioxide / Q000032:analysis; D005232:Fatty Acids, Volatile / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D008697:Methane / Q000032:analysis; D009584:Nitrogen / Q000032:analysis; D009930:Organic Chemicals / Q000302:isolation & purification; D018515:Plant Leaves / Q000737:chemistry*; D012037:Refuse Disposal / Q000379:methods*; D012987:Soil / Q000737:chemistry*; D013696:Temperature; D014865:Waste Disposal, Fluid
chemical_list: D005232:Fatty Acids, Volatile; D009930:Organic Chemicals; D012987:Soil; D002245:Carbon Dioxide; D000641:Ammonia; D009584:Nitrogen; D008697:Methane
keywords: Biogas; Carbon loss; Composting; Solid-state anaerobic digestion; Thermophilic