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http://dx.doi.org/10.4491/KSEE.2012.34.3.155

In-situ Methane Enrichment System Coupled with External $CO_2$ Stripper in Mesophilic Anaerobic Digestion  

Kang, Ho (Department of Environmental Engineering, Chungnam National University)
Jeong, Ji-Hyun (Department of Environmental Engineering, Chungnam National University)
Lim, Seon-Ae (Department of Environmental Engineering, Chungnam National University)
Lee, Hye-Mi (Department of Environmental Engineering, Chungnam National University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.34, no.3, 2012 , pp. 155-161 More about this Journal
Abstract
A simple in-situ methane enrichment system in mesophilic anaerobic digestion was developed to take advantage of the differing solubilities of $CO_2$ and methane. The methane enhancement systems consisted of low solids plug-flow maize digester coupled with a leachate recycle loop to an external $CO_2$ stripper. The effects of leachate recycle rate (LRR) and reactor alkalinity on the resulting offgas $CH_4$ contents, biogas productivity and TVS removal efficiency were quantitively evaluated. The results showed that offgas $CH_4$ contents of over 94% was achieved at 3 volume of leachate recycle per volume of reactor per day (3 v/v-d) and at the reactor alkalinity of 4 g/L as $CaCO_3$, as the optimum operating conditions. The TVS removal efficiency of the methane enhancement system was 79% which corresponds to 94% of the control reactor and the methane productivity appeared to be 0.71 v/v-d. Offgas methane contents correlated well with LRR. However excessively high LRR led to the decrease in TVS removal efficiency.
Keywords
Methane enhancement; Anaerobic digestion; $CO_2$ Stripping; Maize; Leachate recycle;
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