Effect of C/N ratio and ammonia-N accumulation in a pilot-scale thermophilic dry anaerobic digester

Zeshan, , Karthikeyan, Obuli, and Visvanathan, Chettiyappan (2012) Effect of C/N ratio and ammonia-N accumulation in a pilot-scale thermophilic dry anaerobic digester. Bioresource Technology, 113. pp. 294-302.

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Abstract

The effect of ammonia-N accumulation in a dry anaerobic digestion was studied effectively using pilot-scale thermophilic reactor. Two simulations were prepared to attain C/N ratio 27 and C/N ratio 32 using bio-degradable feedstocks such as food waste, fruit and vegetable waste, green waste and paper waste. Organic loading rates and digestate recirculation rates were varied during different time intervals and the performance was evaluated using parameters like pH, VFA, Alkalinity, ammonia-N and biogas yield. Results showed that the simulation with C/N ratio 32 had about 30% less ammonia in digestate as compared to that with C/N ratio 27. The system performed well up to organic loading rate (OLR) 7–10 kgVS/m3 d and retention time up to 19 days, with surplus energy production of 50–73%. Moreover, a free ammonia accumulation/inhibition effect was documented and methods to overcome the adverse effects were discussed.

Item ID: 35918
Item Type: Article (Research - C1)
ISSN: 1873-2976
Keywords: dry anaerobic digestion, pilot scale thermophilic system, organic fraction of municipal solid waste, ammonia-N, C/N ratio
Date Deposited: 29 Oct 2014 00:06
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050206 Environmental Monitoring @ 60%
05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050205 Environmental Management @ 20%
05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050209 Natural Resource Management @ 20%
SEO Codes: 85 ENERGY > 8505 Renewable Energy > 850501 Biofuel (Biomass) Energy @ 50%
85 ENERGY > 8598 Environmentally Sustainable Energy Activities > 859805 Management of Solid Waste from Energy Activities @ 20%
97 EXPANDING KNOWLEDGE > 970105 Expanding Knowledge in the Environmental Sciences @ 30%
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