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2020 Vol.62, Issue 2 Preview Page
Optimization of Methane Yield in Anaerobic Digestion of Sewage Sludge with Microwave Pretreatment

극초단파 전처리를 적용한 하수슬러지 혐기성소화에서 메탄수율 최적화

WoonJi Parka†
,
GwanJae Leeb
,
DongJun Leec
,
SeoRo Leed
,
YuJin Choie
,
JiYeong Hongf
,
DonSeok Yang
,
KyoungJae Limh
박 운지a†
,
이 관재b
,
이 동준c
,
이 서로d
,
최 유진e
,
홍 지영f
,
양 동석g
,
임 경재h
aPostdoctoral Research Fellow, Department of Regional Infrastructure Engineering, Kangwon National University
bPh.D. Student, Department of Regional Infrastructure Engineering, Kangwon National University
cPh.D. Student, Department of Regional Infrastructure Engineering, Kangwon National University
dPh.D. Student, Department of Regional Infrastructure Engineering, Kangwon National University
ePh.D. Student, Department of Regional Infrastructure Engineering, Kangwon National University
fPh.D. Student, Department of Regional Infrastructure Engineering, Kangwon National University
gMaster Student, Department of Regional Infrastructure Engineering, Kangwon National University
hProfessor, Department of Regional Infrastructure Engineering, Kangwon National University
a강원대학교 지역인프라공학부 박사후연구위원
b강원대학교 지역인프라공학부 박사과정 학생
c강원대학교 지역인프라공학부 박사과정 학생
d강원대학교 지역인프라공학부 박사과정 학생
e강원대학교 지역인프라공학부 박사과정 학생
f강원대학교 지역인프라공학부 박사과정 학생
g강원대학교 지역인프라공학부 석사과정
h강원대학교 지역인프라공학부 교수
† Corresponding author Tel.: +82-10-4151-9826, E-mail: parkwoonji@hanmail.net
2020. pp. 17-29
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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.

Keywords
Sewage sludge
microwave pretreatment
methane yield
optimization
anaerobic digestion
response surface analysis
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Information
  • Publisher :The Korean Society of Agricultural Engineers
  • Publisher(Ko) :한국농공학회
  • Journal Title :Journal of Korean Society of Agricultural Engineers
  • Journal Title(Ko) :한국농공학회논문집
  • Volume : 62
  • No :2
  • Pages :17-29
  • Received Date : 2019-11-26
  • Revised Date : 2020-02-18
  • Accepted Date : 2020-02-18
  • DOI :https://doi.org/10.5389/KSAE.2020.62.2.017
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