کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5740273 | 1616294 | 2017 | 7 صفحه PDF | دانلود رایگان |
- Pilot-scale evaluation of anaerobic co-digestion of pig manure with grass silage.
- Synergistic effects of co-digestion improved specific methane yields.
- Co-digestion lowered free ammonia concentrations, improving process stability.
- Marginal synergistic effects obtained when scaling up the co-digestion system.
This study aimed to assess the system stability and synergistic effects of co-digesting pig manure (PM) and grass silage (GS) in a pilot-scale study. Anaerobic digestion of PM alone and co-digestion of PM with GS was carried out in a 480-L continuously stirred tank reactor. The experiment consisted of two phases. In Phase I, PM was digested at an organic loading rate (OLR) of 0.87 kg volatile solid (VS) mâ3·dâ1, and in Phase II, PM and GS were co-digested at 1:1 on a VS basis at an OLR of 1.74 kg VS·mâ3·dâ1. The pilot-scale anaerobic digestion system was stable in both phases. At the steady state, average pH and free ammonia concentrations were 7.99 and 233.0 mg lâ1 in Phase I and were 7.77 and 158.3 mg lâ1 in Phase II, respectively. The specific methane yields increased from 154 ml CH4/g VS added in Phase I to 251 ml CH4/g VS added in Phase II. On average, soluble chemical oxygen demand and VS removal efficiencies increased from 81.4% and 41.4% in Phase I to 87.8% and 53.9% in Phase II, respectively. Further evaluation of synergism suggests that co-digestion of PM and GS can improve system stability and biogas yields despite marginal synergistic effects at pilot-scale.
Journal: International Biodeterioration & Biodegradation - Volume 123, September 2017, Pages 244-250