초록 열기/닫기 버튼
Methane and nitrous oxide from livestock wastewater treatment plants are well known as greenhouse gases (GHGs) that contribute to the global warming. In this study, the emission factor and amount of Methane (CH_4) and Nitrous oxide (N_2O) from different livestock wastewater treatment plants were investigated. The average value of emission factor of CH_4 from liquid cloding process was estimated to be 9.7 gCH_4/m^3-wastewater. And that of storage tank in anaerobic digestion process was 1,440 gCH_4/m^3-wastewater which showed the highest value. This is mainly due to the higher influent organic concentration in anaerobic digestion plant than the liquid cloding process. In addition, emission factor of N_2O (23.2 gN_2O/m^3) in bio-ceramic sequencing batch reactor (BCS) was more than three times higher than in liquid cloding process (8.4 gN_2O/m^3). The emission amounts of CH_4 and N_2O expressed as CO_2 equivalent were calculated using global warming potential values, and the results are 2,249.5 tonCO_2/yr in liquid cloding process, 2,349.5 tonCO_2/yr in BCS plant and 2,979.4 tonCO_2/yr in anaerobic digestion plant. This result indicates the GHGs emission amount in livestock wastewater treatment plants is dependent on the treatment process types and influent concentration.
