Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Optimization of Methane Yield in Anaerobic Digestion of Sewage Sludge with Microwave Pretreatment

극초단파 전처리를 적용한 하수슬러지 혐기성소화에서 메탄수율 최적화

  • 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)
  • Received : 2019.11.26
  • Accepted : 2020.02.18
  • Published : 2020.03.31
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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.

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