Performance of Semi-dry Anaerobic Digestion of Organic Solid Waste in Mesophilic Continuous Operation

B. Sajeena Beevi, G. Madhu and Praseetha P. Nair

Performance of Semi-dry Anaerobic Digestion of Organic Solid Waste in Mesophilic Continuous Operation

2020

B. Sajeena Beevi, G. Madhu and Praseetha P. Nair

The purpose of this study was to evaluate the performance of anaerobic digestion of organic fraction of municipal solid waste to biogas in a mesophilic (32°C) continuous digester at a total solid concentration (TS) of 12%. The digester was operated with different organic loading rates and constant retention time. The performance of the reactor was evaluated using parameters like pH, volatile fatty acid (VFA), alkalinity, chemical oxygen demand (COD), total organic carbon (TOC), ammonia-N and biogas yield. During the reactor’s start-up period (first phase), the process is stable and there is no inhibition occurred. In the second phase, the reactor was fed in continuous mode with different organic loading rates and constant retention time. The highest volatile solid (VS) degradation of 65.9%, with specific biogas production of 368 L.kg-1 VS fed was achieved with organic loading rate (OLR) of 3.1 kg VS.m-3.d-1 and a retention time of 30 days.

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