Development in Non-CO2 emissions factors for environmental facilities in South Korea

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概要

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• Sewage treatment plants (STPs) are considered to be one of the key emission sources of nitrous oxide (N2O). It is estimated that 3,000 ton-N2O were emitted from STPs in South Korea during 2005. This study investigated the major characteristics of N2O emissions from STPs in South Korea using the A2O series method. The examined STPs of this study were A2O series treatment plants such as conventional A2O, Media-A2O, and the five-stage treatment plants. The N2O concentrations from STPs were measured using GC-ECD. A comparison between N2O emissions and hydraulic retention time (HRT) was performed, with HRT appearing to have an effect on N2O emissions because the reduction of HRT increased the inflow nitrogen load. Also, a relation between N2O emissions and the C/N ratio was developed, with N2O emissions affected by the influent C/N ratio. The result suggests N2O emissions discharged from STPs increased with decreasing the C/N ratio of influent sewage. Average emission levels of N2O from STPs using the A2O series method ranged between 14.01 and 52.96 kg N2O/day. The N2O emission factors for the anaerobic/anoxic/aerobic variable method, Media-A2O and the five-stage method were 128.55, 110.13, and 150.87 mg/m3, respectively. The emission factors of N2O from STPs using the A2O series method accounted for 75% of the total emissions, with 2,255 tons N2O/yr released in South Korea. The results of this study will be useful for developing smart mitigation strategies related to climate change in South Korea.

• 一般社団法人 廃棄物資源循環学会の論文

一般社団法人 廃棄物資源循環学会 | 論文

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