Biogas Production from Distilled Grain Waste by Thermophilic Dry Anaerobic Digestion: Pretreatment of Feedstock and Dynamics of Microbial Community

Distilled grain waste (DGW) eluted from the Chinese liquor making process poses potential serious environmental problems. The objective of this study is to evaluate the feasibility of converting DGW to biogas by thermophilic dry anaerobic digestion. To improve biogas production, the effects of dilut...

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Bibliographic Details
Published in:Applied biochemistry and biotechnology 2018-02, Vol.184 (2), p.685-702
Main Authors: Wang, Ting-Ting, Sun, Zhao-Yong, Huang, Yu-Lian, Tan, Li, Tang, Yue-Qin, Kida, Kenji
Format: Article
Language:English
Subjects:
Anaerobic digestion
Anaerobic microorganisms
Anaerobic processes
Anaerobiosis
Biochemistry
Biofuels
Biogas
Bioreactors - microbiology
Biotechnology
Bone morphogenetic proteins
Chemistry
Chemistry and Materials Science
Communities
Community structure
Dilution
Feasibility studies
Grain
Hot Temperature
Load distribution
Loading rate
Medical Waste Disposal - instrumentation
Medical Waste Disposal - methods
Methane
Methane - metabolism
Microbiomes
Microorganisms
Pretreatment
Raw materials
Refuse as fuel
Sludge
Structural analysis
Sulfuric acid
Sulfuric Acids - chemistry
Thermophilic microorganisms
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Summary:Distilled grain waste (DGW) eluted from the Chinese liquor making process poses potential serious environmental problems. The objective of this study is to evaluate the feasibility of converting DGW to biogas by thermophilic dry anaerobic digestion. To improve biogas production, the effects of dilute H 2 SO 4 and thermal pretreatment on DGW were evaluated by biochemical methane potential (BMP) tests. The results indicate that 90 °C thermal pretreatment provided the highest methane production at 212.7 mL/g-VTS add . The long-term thermophilic dry anaerobic digestion process was conducted in a 5-L separable flask for more than 3 years at a volatile total solid (VTS) loading rate of 1 g/kg-sludge/d, using synthetic waste, untreated and 90 °C thermal pretreated DGW as the feedstock, respectively. A higher methane production, 451.6 mL/g-VTS add , was obtained when synthetic waste was used; the methane production decreased to 139.4 mL/g-VTS add when the untreated DGW was used. The 90 °C thermal pretreated DGW increased the methane production to 190.5 mL/g-VTS add , showing an increase of 36.7% in methane production compared with that using untreated DGW. The microbial community structure analysis indicates that the microbial community in the thermophilic dry anaerobic digestion system maintained a similar structure when untreated or pretreated DGW was used, whereas the structure differed significantly when synthetic waste was used as the feedstock.
ISSN:0273-2289
1559-0291
DOI:10.1007/s12010-017-2557-6