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http://dx.doi.org/10.15681/KSWE.2019.35.4.299

Evaluation of Low-temperature Thermal Pre-treatment and Biogas Characteristics using Waste Activated Sludge  

Choi, Jae-Hoon (Department of Graduate School, Kyonggi University)
Jeong, Seong-Yeob (Environment Energy O&M Institute of Technology)
Kim, Ji-Tae (Department of Environmental Enggineering, Colleage of Engineering, Kyonggi University)
Publication Information
Journal of Korean Society on Water Environment / v.35, no.4, 2019 , pp. 299-307 More about this Journal
Abstract
The purpose of this study was to investigate the effect of low temperature thermal pre-treatment on biodegradation of waste activated sludge for anaerobic digestion as a countermeasure for increasing sludge generation. The experimental condition was accomplished in 2 %, 4 %, and 6 % TS concentration, and $70^{\circ}C$, $80^{\circ}C$, $90^{\circ}C$ of temperature for a maximum of 120 minutes retention time. Then, it was followed by analysis of physical/chemical properties, BMP test and composition of biogas. The biogas characteristic was evaluated by applying the modified Gomperz model. As a result, solubility of dissolved substrate, such as $SCOD_{Cr}$, soluble carbohydrate, and soluble protein, and biogas production increased as temperature increased. Solubilization efficiency at $90^{\circ}C$ was 18.4 %, 17.03 % and 16.88% in 2 %, 4 %, and 6 % TS concentration respectively. Also, solubilization rates of carbohydrate and protein similarly increased. BMP test results also showed that methane production in excess sludge increased to 0.194, 0.187 and $0.182m^3/kg$ VS. respectively, and lag phase decreased to 0.145, 0.220, 0.351 day due to acceleration of the hydrolysis step. Consequently, low-temperature thermal pre-treatment could increase biodegradability of sludge, positively affecting biogas production and sludge reduction.
Keywords
BMP test; Solubilization; Thermal pre-treatment; Waste Activated Sludge;
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Times Cited By KSCI : 2  (Citation Analysis)
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