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마그네타이트와 탄소 나노튜브 첨가를 통한 긴사슬지방산의 혐기성소화 증진
알사예드 모스타파(Alsayed Mostafa),송영채(Young-Chae Song),김동훈(Dong-Hoon Kim) 유기성자원학회 2019 유기성자원학회 학술발표대회논문집 Vol.2019 No.춘계
By the hydrolysis of lipid-rich substrates in anaerobic digestion (AD) process, long chain fatty acids (LCFAs) are excreted, which are known to adversely affect further degradation steps and limit methane productivity. On the other hand, direct interspecies electron transfer (DIET) reaction could make syntrophic degradation of LCFAs thermodynamically favorable. In the present work, anaerobic batch tests were performed while supplementing conductive materials, carbon nanotube (CNT) or magnetite powder (Fe3O4), at different concentrations of oleic acid (1, 2, 4, 6 and 8 g COD/L). The maximal volumetric CH4 production values of 0.41 and 0.64 L CH4/L reactor, recording 84 and 188% higher than control, were found at batch of 4 g COD/L, were corresponding to Fe3O4 and CNT, respectively. At all the tested concentrations of oleic acid, supplementation of either CNT or Fe3O4 remarkably reduced the needed lag phase period. The reason behind advanced CH4 production attitude denoted by CNT compared to Fe3O4 can be the high specific surface area, which provides an advanced microbial attachment feature. Further, Fe3O4- and CNT-supplemented consortia exhibited enhanced conductivity values of 15.7 and 12.4 μS/cm, comapred to the 8.1 μS/cm found in control. This study concludes the feasibility of supplementing conductive materials, especially CNT, for mitigating the inhibitory impact of LCFA digestion and boosting the attained CH4 production.
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