Journal of Environmental Conservation Engineering

Online ISSN : 1882-8590
Print ISSN : 0388-9459
ISSN-L : 0388-9459

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Volume 42, Issue 5

Displaying 1-1 of 1 articles from this issue

research-articles

Effects of Automatic Mixing by a Siphon on Anaerobic Digestion

Comparative Experiments Using Reactors with Different Mixing Modes

Ya-Peng WU, Takuro KOBAYASHI, Kai-Qin XU, Yu-You LI

2013 Volume 42 Issue 5 Pages 291-299
Published: May 20, 2013
Released on J-STAGE: May 29, 2013

DOIhttps://doi.org/10.5956/jriet.42.291

JOURNAL FREE ACCESS

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A continuous experiment of mesophilic anaerobic digestion of kitchen waste was performed using three types of reactors: ⑴ an automatic mixing reactor with a siphon(siphon reactor),⑵ a completely stirred reactor and ⑶ an unmixed reactor. Comparisons of performance and digestion characteristics inside the reactors show significant variations, described below. The siphon reactor performed well under a very high COD loading rate, while an increase in the COD loading rate to 10 ㎏/㎥/d triggered a significant volatile fatty acid(VFA)accumulation in the plug flow reactor. Even under a similar COD loading rate, the methane yield of the siphon reactor was at least 10% higher than that of the unmixed reactor. VFA and Organic Solids were distributed uniformly inside the siphon reactor as compared to the unmixed reactor, potentially leading to reduced precipitations and acidification.

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