GREENHOUSE GAS EMISSIONS FROM ANAEROBIC DIGESTION PLANTS
Keywords:greenhouse gas, emissions, anaerobic digestion, windrows, organic waste, methane.
This study investigated emissions of CH4, N2O and NH3 from nine anaerobic digestion plants that treat biowaste. The treatment is in form of mechanical pre-treatment, anaerobic digestion followed by a composting with or without intensive aeration. The exhaust gases from the mechanical and anaerobic steps are treated by biofilters. The emission sources at the plants consisted of biofilters, combined heat and power units (CHP), liquid digestate treatment systems (LTS) and open composting windrows of the solid digestate. Overall, the emission factors were 0.4 - 16 kg (Mg biowaste)-1 for CH4, 7 - 170 g (Mg biowaste)-1 for N2O and 41 - 6,032 g (Mg biowaste)-1 for NH3. Open composting windrows of solid digestate resulted in high emissions of CH4 and N2O. Intensive aeration of the solid digestate could reduce greenhouse gas emissions.
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