Aqueous Ammonia Soaking of Wheat Straw at Ambient Temperature for Enhancing the Methane Yield: Process Optimization by Response Surface Methodology

Aqueous ammonia soaking (AAS) at ambient temperature was applied to wheat straw under different conditions in order to maximize the CH 4 yield through mesophilic anaerobic digestion. The effects of the NH 3 concentration, duration of AAS and solid-to-liquid ratio were studied on the resulting CH 4 y...

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Bibliographic Details
Published in:Waste and biomass valorization 2020-09, Vol.11 (9), p.4821-4835
Main Authors: Lymperatou, Anna, Gavala, Hariklia N., Skiadas, Ioannis V.
Format: Article
Language:English
Subjects:
Ambient temperature
Ammonia
Anaerobic conditions
Anaerobic digestion
Engineering
Environment
Environmental Engineering/Biotechnology
Hemicellulose
Industrial Pollution Prevention
Lignin
Methane
Optimization
Original Paper
Reagents
Renewable and Green Energy
Response surface methodology
Solubilization
Straw
Strong interactions (field theory)
Waste Management/Waste Technology
Wheat
Wheat straw
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Summary:Aqueous ammonia soaking (AAS) at ambient temperature was applied to wheat straw under different conditions in order to maximize the CH 4 yield through mesophilic anaerobic digestion. The effects of the NH 3 concentration, duration of AAS and solid-to-liquid ratio were studied on the resulting CH 4 yield and the solubilization degree of the pretreated wheat straw. A strong interaction among the NH 3 concentration and the duration of AAS was observed. The optimal conditions found were 18% w/w NH 3 , 7 days of duration and 50 g straw/L reagent, leading to a 43% increase of the CH 4 yield in 17 days of digestion. Compositional analysis of the optimally-treated wheat straw revealed that a significant solubilization of hemicellulose took place during AAS together with a moderate lignin removal (9%). Graphic Abstract
ISSN:1877-2641
1877-265X
DOI:10.1007/s12649-019-00806-7