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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Published in: | Waste and biomass valorization 2020-09, Vol.11 (9), p.4821-4835 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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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 |
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ISSN: | 1877-2641 1877-265X |
DOI: | 10.1007/s12649-019-00806-7 |