회분식 혐기성 반응조에서 기질 주입 주기의 영향 분석
저자 : 김종현, 박정화, 이종근, 김재영
출처 : 한국폐기물자원순환학회지 Vol.31 No.7 (2014년 10월) pp.713-719 2093-2332 KCI

Abstract
Anaerobic digestion is getting attention by its ability to degrade organic materials and produce energy at the same time. Even though most full-scale anaerobic digesters are operated as continuously fed reactors, laboratory-scale tests for design parameters would be conducted using batch or semi-batch reactors. The objective of this study was to investigate the effect of different feeding patterns with an identical organic loading rate on the performance of laboratory-scale batch anaerobic digestion reactors. Laminaria japonica was applied as a substrate with 1.5 g-VS/L.day of loading rate. Three different types of feeding periods, i.e, 12, 24, and 48 hours, were applied. The reactors were operated at HRT 26.7 days, 35 ± 1oC mesophilic anaerobic condition. The methane production rates were 165.10 ± 16.92, 120.74 ± 40.25, and 57.81 ± 20.06 mLCH4/gVS for feeding periods of 12, 24, and 48 hours, respectively. Reactors fed more frequently produced more methane gas and the coefficient of variation was lower. As substrate feeding period increased, concentrations of total volatile fatty acids (VFAs) increased and pH decreased. Finally, the reactor with 48 hours of feeding period was failed after 22 days of operation. Consequently, it was shown that feeding pattern may significantly affect performances of laboratory-scale batch anaerobic digestion reactors and the results from laboratory tests may mislead the design of full-scale digesters.
Key Words : Anaerobic batch reactor, Laminaria japonica, Mesophilic anaerobic digestion, Substrate feeding periods, Volatile fatty acids