Energies 2013, 6(8), 4207-4222; doi:10.3390/en6084207
Article

Effect of Mixing Driven by Siphon Flow: Parallel Experiments Using the Anaerobic Reactors with Different Mixing Modes

1 Center for Material Cycles and Waste Management Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan 2 Graduate School of Environmental Studies, Tohoku University, 6-6-06 Aza-Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan 3 School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Minghang District, Shanghai 200240, China
* Author to whom correspondence should be addressed.
Received: 8 June 2013; in revised form: 25 July 2013 / Accepted: 5 August 2013 / Published: 19 August 2013
(This article belongs to the Special Issue Biomass and Biofuels 2013)
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Abstract: The effect of mixing by siphon flow on anaerobic digestion, sludge distribution and microbial community were examined in parallel experiments using a siphon-mixed reactor (SMR), an unmixed reactor (UMR) and a continuously mixed reactor (CMR). The SMR performed well without the accumulation of fatty acids under COD loading rates varying from 3 to 18 kg/m3/day, while the UMR was totally acidified when the loading rate increased to 10 kg/m3/day. The methane yield of the SMR was at least 10% higher than that of the UMR, and comparable to that of the CMR. Furthermore, the SMR was found to markedly improve the dispersion of solids and reduce deposit formation compared to the UMR. Besides, during stable operation, the fatty acids level in the effluent of the SMR and UMR was lower than that in the CMR, and the archaeal community structure of the SMR was similar to that of the UMR.
Keywords: anaerobic digestion; siphon mixed reactor; mixing mode; sludge distribution; microbial community

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MDPI and ACS Style

Kobayashi, T.; Wu, Y.-P.; Xu, K.-Q.; Li, Y.-Y. Effect of Mixing Driven by Siphon Flow: Parallel Experiments Using the Anaerobic Reactors with Different Mixing Modes. Energies 2013, 6, 4207-4222.

AMA Style

Kobayashi T, Wu Y-P, Xu K-Q, Li Y-Y. Effect of Mixing Driven by Siphon Flow: Parallel Experiments Using the Anaerobic Reactors with Different Mixing Modes. Energies. 2013; 6(8):4207-4222.

Chicago/Turabian Style

Kobayashi, Takuro; Wu, Ya-Peng; Xu, Kai-Qin; Li, Yu-You. 2013. "Effect of Mixing Driven by Siphon Flow: Parallel Experiments Using the Anaerobic Reactors with Different Mixing Modes." Energies 6, no. 8: 4207-4222.

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