2019 CSCE Annual Conference - Laval (Greater Montreal)

2019 CSCE Annual Conference - Laval (Greater Montreal) Conference


Title
Performance assessment of low temperature anaerobic digestion biotechnology for treating poultry manure

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Author(s)
Mr. Suman Adhikary, Concordia University (Presenter)
Mr. Mario Khalil, Université de Sherbrooke, Sherbrooke, QC, Canada; Agriculture and Agri-Food Canada, Sherbrooke Research and Development Center, Sherbrooke, QC, Canada.
Ms. Daphneé Dorval
Mr. Jérôme Dubreuil, Agriculture and Agri-Food Canada.
Dr. Bernard Goyette, Agriculture and Agri-Food Canada.
Dr. Saifur Rahaman, Concordia University
Dr. Rajinikanth Rajagopal, Agriculture and Agri-Food Canada.
Abstract

The treatment and disposal of livestock manure is always a major concern because of it’s environmental, economic and legal issues. Anaerobic digestion (AD) is a widely used treatment method for the proper management of the high solid content wastes from livestock sectors. This is because AD is associated with energy recovery, solid by-products (digestate) as fertilizer and less generation of greenhouse gases. However, for the successful implementation of field scale AD process, lab scale operation is crucial to predict the performance. In this research, AD of chicken manure has been studied to determine the operational stability of the lab-scale AD process by performing the sequencing batch mode of operation in a 40 L (total volume) digester. Organic loading rate (OLR) during this phase of the study has been maintained in the range of 0.7–1.12 g CODt/L/day, while digester temperature has been maintained at 20±1 0C. For the initial 7 cycles of operation (cycle length = 14 days), CODtotal has been reduced to 41-90%, with the highest specific methane yield (SMY) of 0.29 L CH4/gCODt fed. The study also reveals that volatile fatty acids (VFA) can be reduced up to 90% whereas CH4 quality can reach up to 80%, which ensures the process stability of maintaining favorable conditions for microbial communities. Total ammonia nitrogen (TAN) up to 5 gN/L did not affect the digestion process.