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DOI : , Vol.22, No.5, 141 ~ 149, 2014
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| Title |
| Analysis of Simultaneous Denitrification and Methane Produced During Anaerobic Digestion |
| 이준상 Jun Sng Lee , 변병수 Byoung Su Byun , 배종훈 Jong Hun Bae , 이범 Yonh Hyo Song , 전항배 Hang Bae Jun |
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| Abstract |
| During denitrification volatile fatty acid was expected to be used as a carbon source, when NO3- was added into the methanogenic phase where glucose and volatile fatty acid were accumulated. In this study the effect of the addition of NO3- on the production of methane was investigated. Nitrogen oxides (NOx) were found to inhibit the methane production, however the process of denitrification and methane production occurred simultaneously. In addition if only NO3- and NO2- were co-existed, the process of methane production was discontinued. And when glucose and volatile fatty acid were compared as carbon substrate, there was significantly different only among the rates of decomposition of COD (organic matters) and NO3- and the production of methane. It has been observed that methanogenesis was progressed only after NO3--N was completely decomposed. Also as higher the concentration of NO3- was added, more organic matters were used for denitrification and it resulted the inhibition of methane production. In other words, at the initial stage of denitrification, the activity of denitrifying bacteria was dominant, however once NO3- was completely decomposed or once the denitrification was completed the methanogenic bacteria was appeared to be activated and overall the activity of denitrifying bacteria was dominant over the methanogenic bacteria. |
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| Key Words |
| Anaerobic digestion, VFAs, Denitrification |
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