TAILIEUCHUNG - Greenhouse gas emissions from anaerobic digestion plants
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. | Journal of Science and Technology 54 (4B) (2016) 208-215 GREENHOUSE GAS EMISSIONS FROM ANAEROBIC DIGESTION PLANTS Nguyen Thanh Phong1, *, Joachim Clemens2, Carsten Cuhls3 1 Faculty of Science and Technology, Hoa Sen University, 8 Nguyen Van Trang, District 1, HCM city, Vietnam 2 3 Faculty of Agriculture, University of Bonn, Karlrobert-Kreiten , 53115 Bonn Ingenieurgesellschaff für Wissenstransfer, Gewitra mbH, Im Moore 45, 30167 Hannover * Email: Received: 15 August2016; Accepted for publication: 10 November 2016 ABSTRACT 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 - 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. Keywords: greenhouse gas, emissions, anaerobic digestion, windrows, organic waste, methane. 1. INTRODUCTION Anaerobic digestion for treatment of biowaste is rapidly gaining interest in developed and developing countries [1, 2]. The treatment is essentially based on the activities of microorganisms that transform organic substances into biogas [3]. Biogas is used as renewable energy source, and nutrients in the residue can be recovered in agriculture as fertilizer or soil conditioner [4]. In addition, AD of biowaste is attracting attention as an effective method to reduce .
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