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Biogas usually contains CH 4 and CO 2 as main components with the ratio of 6 : 4, and its composition varies with wide range depending on digester conditions. In addition to concentration change of each constituent, biogas composition could be changed due to the variations in the organic matter treatment process. The aim of the study is to analyze the production and application to a microturbine system of CH 4 /N 2 rich biogas produced from Gong-Ju wastewater treatment plant. CH 4 /N 2 rich biogas is produced due to the internal wastewater recirculation. The internal wastewater recirculation is intended to enhance NO 3 − removal without additional carbon source input. As a result, the digester was shown to be the highest contributor for nitrogen removal and average CH 4 concentration was lowered compared to the typical biogas composition. Nitrate removal rate was influenced by the internal recirculation ratio. Content of N 2 has no effect on biogas clean-up system performance. Besides, adaptability of CH 4 /N 2 rich biogas to microturbine was satisfactory with very low NOx and SO 2 concentration in microturbine exhaust gas. Influence of high N 2 concentration of biogas on NOx concentration was limited due to the low combustion temperature.

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