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http://dx.doi.org/10.5389/KSAE.2020.62.2.017

Optimization of Methane Yield in Anaerobic Digestion of Sewage Sludge with Microwave Pretreatment  

Park, WoonJi (Department of Regional Infrastructure Engineering, Kangwon National University)
Lee, GwanJae (Department of Regional Infrastructure Engineering, Kangwon National University)
Lee, DongJun (Department of Regional Infrastructure Engineering, Kangwon National University)
Lee, SeoRo (Department of Regional Infrastructure Engineering, Kangwon National University)
Choi, YuJin (Department of Regional Infrastructure Engineering, Kangwon National University)
Hong, JiYeong (Department of Regional Infrastructure Engineering, Kangwon National University)
Yang, DongSeok (Department of Regional Infrastructure Engineering, Kangwon National University)
Lim, KyoungJae (Department of Regional Infrastructure Engineering, Kangwon National University)
Publication Information
Journal of The Korean Society of Agricultural Engineers / v.62, no.2, 2020 , pp. 17-29 More about this Journal
Abstract
The objective of this study was to find an optimum methane yield condition in anaerobic digestion of sewage sludge with microwave pretreatment. The pretreatment process was carried out using a lab scale industrial microwave unit (2,450 MHz frequency). The digestion efficiency of pretreated sludge was evaluated by biochemical methane potential (BMP) test. Box-Behnken design and Response Surface Analysis (RSA) were applied to determine the optimal combination of sludge mixing ratio (0 to 100%), power (400 to 1600 W), holding time (0 to 10 min) and pretreatment temperature (60 to 100℃). BMP test results showed that Volatile Solid (VS) removal efficiency was up to 48% at a condition of 0% for mixing ratio, 1600 W for power, 5 min for holding time, and 80℃ for pretreatment temperature. Methane production was up to 832.3 mL/g VSremoved at a condition of 50% for mixing ratio, 1000 W for power, 5 min for holding time, and 80℃ for pretreatment temperature. The results of the variance analysis (ANOVA) showed that the p-value of the power and pretreatment temperature among the independent variables were significant (p<0.05), and in particular, the pretreatment temperature significantly affected on the solubilization and methane production. The optimum condition for the maximum methane yield (847 mL/g VSremoved) was consist of 38.4% of mixing ratio, 909.1 W of power, 4.1 min of holding time, and 80℃ of temperature within the design boundaries.
Keywords
Sewage sludge; microwave pretreatment; methane yield; optimization; anaerobic digestion; response surface analysis;
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