POTENTIAL ENERGY GENERATION FROM THE BIOGAS TRANSFORMATION OF POULTRY SLAUGHTERHOUSE BY-PRODUCTS

摘要

This study was carried out to assess the energy recovery potential from solid organic by-products of arnpoultry slaughtering facilityand to explore the potential of an energy self-sufficient industry. There are severalrnprocesses to convert organic material to energy; the technology of interest in this study was biogas transformation,rnthe biological conversion of degradable organic material into methane. The scenario was confined to a full scalernpoultry slaughtering facility processing 150,000heads weekly and having a Specific Energy Consumption (SEC) ofrn3096MJ t~(-1) of dress carcass weight. The methane potential of chicken manure, soft offal, dissolved air flotation sludgernas well as a mixed waste stream (combination of the soft offal and sludge) was determined through a series ofrnbiochemical methane potential assays under mesophilic conditions. The methane potential of the chracterised wasternstreams ranged from 251.5-694.6mlCH_4 gVS~(-1). The highest methane yield achieved was from the mixed wasternstream, 594.6mlCH_4 gVS~(-1)or 206.68m~3 biogas t~(-1) of wet waste with a 66% methane content. The technical analysisrnexplored the combustion of the potential raw biogas production from the digestion of 5680t of the mixed waste in arncombined heat and power unit with anoverall efficiency of 86%. The biogas generation and subsequent energyrnrecovery could potentially subsidies 57.5% (43.4% electricity and 82.6% thermal) of the SEC of the poultryrnslaughterhouse sampled.