Feather is produced in large amounts as a waste in poultry slaughterhouses. Only 60-70% of the poultry slaughterhouse products is edible for human. 16-20% of the slaughterhouse by-products contains keratin; from this 7-9% consists of feather with 50-70% moisture content. Treatment of poultry feather anaerobically is a challenge, because of the complex, rigid, and fibrous structure of keratin, the main component of feathers. Under anaerobic conditions, poultry feather degrades poorly, which is the main obstacle for anaerobic digestion. The reported value of chicken feather methane potential is 0.19– 0.20Nm3 /kg VS, which is only one third of the theoretical value. It is an excellent raw material for biogas production due to high protein content. Dried chicken feathers contain about 90% proteins with 0.2 methane potential (m3 kg-1 VS added) and 0.05 methane potential (m3 kg-1 wet weight). The keratin-content of feather is difficult to digest, so physical, chemical and/or biological pre-treatment are needed in practice, which have to be set according to the utilization method. Feather was degraded with the help of enzyme and then digested in anaerobic bioreactors in different ratios. We used cattle slurry as control without feather. Our main objectives for this study were to determine the effect of enzymatic pre-treatment, biogas methane potential of feather waste and the most effective treatment ratios. Chicken feather waste can also be digested or used with other feedstock as a co-digestion substrate.
Chicken feather, methane, enzymatic, co-digestion, proteins, anaerobic digestion
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