| Abstract |
| The objective of this study was to steer the competition between methane producing bacteria and sulfate reducing bacteria towards optimal sulfate reduction and thus promotion of the anaerobic degradation of lignocellulosic material in phase V. In addition to the degradation promoting effect of lignocelluloscic material, sulfate reduction will enhance the suppression of methane production. In the reactors with sulfidogenic condition, the presence of higher concentration of hydrolysis products of cellulose (i.e., glucose) and lignin (i.e., aromatic lignin derivatives) along with higher chemical oxygen demand and total organic carbon in the leachates as compared to those from methanogenic reactors, indicated faster rate of degradation of lignocellulosic material loaded in the reactors. The gas production was higher in the partially saturated methanogenic reactor. The gas production in the reactor with no leachate circulation was delayed, but was higher than the gas production in sulfidogenic reactors. The lower methane production in partially and fully saturated sulfidogenic reactors can be attributed to the degradation of lignocellulosic material to carbon dioxide and sulfide. At end of the experiment, the percentage of lignocellulosic carbon release in sulfidogenic reactors was higher than that in methanogenic reactors. The amount of carbon which is recovered from the gas produced in the partially saturated sulfidogenic reactor by day 700 was 1.4 times larger than carbon release from leachate and aeration tank, while the carbon release from leachate and aeration tank in the fully saturated sulfidogenic reactor by day 700 was 1.3 times larger than carbon which is recovered from the gas produced. |
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| Key Words |
| Carbon release, Leachate, Lignocellulosic material, Methanogenic, Sulfidogenic, 탄소배출, 침출수, 리그노셀룰로스, 메탄생성조건, 황산염환원조건 |
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