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http://dx.doi.org/10.4491/KSEE.2011.33.7.516

A Study of the Improvement in an Anaerobic Digester for Sludge Reduction  

Kim, Hong-Seok (Department of Energy and Environmental engineering, Seoul National University of Science and Technology)
Lee, Tae-Jin (Department of Energy and Environmental engineering, Seoul National University of Science and Technology)
Publication Information
Journal of Korean Society of Environmental Engineers / v.33, no.7, 2011 , pp. 516-522 More about this Journal
Abstract
The largest problem of domestic anaerobic digestion is low digestion efficiency. Reasons of the problem would be low organic matters input, low mixing efficiency in digestion tank, refractory excess sludge etc.. In this study, screw attached disk-type concentration system and a mechanical mixing system, solubilization facility improvements were performed to solve problems. Through these improvements, the sludge conc. of the concentrator increased 2.6-fold and the volume reduction efficiency was increased 3.0-fold. In addition, the dead-space is reduced by mechanical agitation. Anaerobic digester gas production in the digestion tank is increased from $193.8m^3$ to $386.0m^3$ per day. Digestion efficiency is improved to 54.6% from 47.6%. Digestion gas production is increased from $0.30Nm^3/kg$ VS to $0.42Nm^3/kg$ VS.
Keywords
Anaerobic Digestion; Biogas; Mixer; Solubilization; Concentrator;
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