Synergistic Co-Digestion of Microalgae and Primary Sludge to Enhance Methane Yield from Temperature-Phased Anaerobic Digestionopen access
- Authors
- Damtie, Mekdimu Mezemir; Shin, Jingyeong; Jang, Hyun Min; Kim, Young Mo
- Issue Date
- Sep-2020
- Publisher
- MDPI
- Keywords
- anaerobic digestion; co-digestion; microalgae; primary sludge; biological pretreatment; methane yield
- Citation
- ENERGIES, v.13, no.17, pp.1 - 18
- Indexed
- SCIE
SCOPUS
- Journal Title
- ENERGIES
- Volume
- 13
- Number
- 17
- Start Page
- 1
- End Page
- 18
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/8948
- DOI
- 10.3390/en13174547
- ISSN
- 1996-1073
- Abstract
- A two-stage temperature-phased mesophilic anaerobic digestion assay was carried out to study the interaction between various biological pretreatment conditions and the possible synergistic co-digestion of microalgae and primary sludge. The study of growth kinetics of the biochemical methane potential test revealed that a maximum of 36% increase in methane yield was observed from co-digestion of a substrate pretreated by thermophilic aerobic conditions (55 degrees C and HRT = 2 days) and an 8.3% increase was obtained from the anaerobic pretreated substrate (55 degrees C and HRT = 3 days). Moreover, no synergistic effects on methane yields were observed in co-digesting the substrate pretreated with high temperature (85 degrees C). The study also identified specific conditions in which interaction between biological pretreatment and co-digestion might substantially reduce methane yield. Careful optimization of operating conditions, both aerobic and anaerobic pretreatment at moderate thermophilic conditions, can be used as a biological pretreatment to enhance methane yield from the co-digestion of microalgae and primary sludge.
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