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A feasibility study of a pilot scale two-phase anaerobic digestion with ultra filtration for the treatment of garbage leachate  

Lee, Eun-young (인하대학교 환경공학과)
Heo, Ahn-hee (인하대학교 환경공학과)
Kim, Hyung-kuk (인하대학교 환경공학과)
Kim, Hee-jun (인하대학교 환경공학과)
Bae, Jae-ho (인하대학교 환경공학과)
Publication Information
Journal of Korean Society of Water and Wastewater / v.23, no.5, 2009 , pp. 539-545 More about this Journal
Abstract
A feasibility of a pilot scale two-phase anaerobic digestion with ultra filtration system treating garbage leachate were evaluated. The treatment system consisted of a thermophilic acidogenic reactor, a mesophilic methanogenic reactor, and an UF membrane. The average COD removal efficiency of the treatment system was 95% up to the OLR of 3.1 g COD/L/d. The higher COD removal efficiency with membrane unit resulted from the removal of some portion of soluble organics by membrane as well as particulate materials. When the membrane unit was in operation, bulk liquid in acidogenic and methanogenic reactors was partially interchanged, which maintained the acidogenic reactor pH over 5.0 without external chemical addition. Also, with the production of methane in the acidogenic reactor, the organic loading rate of the methanogenic reactor reduced. The initial flux of the membrane unit was $50{\sim}60L/m^2/hr$, but decreased to $5 L/m^2/hr$ after 95 days of operation due to clogging caused by particulate materials such as fibrous materials in garbage leachate. To prevent clogging caused by particulate materials, a pretreatment system such as screening is required. With the improvement with membrane unit operation, the two-phase anaerobic digestion with ultra filtration system is expected to have the possibility of treating garbage leachate.
Keywords
garbage leachate; two phase anaerobic digestion; ultrafiltration; tubular;
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