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http://dx.doi.org/10.17137/korrae.2017.25.1.35

Characteristics of Anaerobic Biodegradability in Hydro-thermal Hydrolysate of Sewage Sludge  

Oh, Seung-Yong (Biogas Research Center, Hankyong National University)
Yoon, Young-Man (Biogas Research Center, Hankyong National University)
Publication Information
Journal of the Korea Organic Resources Recycling Association / v.25, no.1, 2017 , pp. 35-45 More about this Journal
Abstract
In order to improve the anaerobic digestion efficiency of the sewage sludge, the methane potential of the hydrolysate generated from the hydro-thermal reaction at 170, 180, 190, 200, 210, $220^{\circ}C$ was analyzed and the constitutional characteristics of the organic materials were estimated by dividing organic materials of hydro-thermal hydrolysate into easily biodegradable, decomposition resistant, and non-biodegradable organic materials applying the parallel first order kinetics model. The ultimate methane potential of sewage sludge hydro-thermal hydrolysate increased to 0.39, 0.39, 0.40, 0.44, 0.45, and $0.46Nm^3/kg-VS_{added}$ as hydro-thermal reaction temperature increased from 170, 180, 190, 200, 210, $220^{\circ}C$. It has been shown that the organic matter of sewage sludge is solubilized to increase the content of biodegradable organic material($VS_B$). The easily degradable organic matter($VS_e$) content was highest at hydro-thermal reaction temperature of 200 and $210^{\circ}C$, and optimum hydro-thermal reaction temperature for organic matter solubilization of sewage sludge was in the range of $200{\sim}210^{\circ}C$. In addition, the amount of biodegradable organic material($VS_B$) and easily biodegradable organic matter ($VS_e$) in the hydrolysate of sewage sludge was the highest at hydro-thermal reaction temperature of $200^{\circ}C$.
Keywords
Hydro-thermal Carbonization; Anaerobic Digestion; Sewage Sludge; Parallel First Order Kinetics;
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