Improvement of anaerobic digestion of lignocellulosic biomass by coupling fungal and chemical pretreatments - Archive ouverte HAL Accéder directement au contenu
Poster De Conférence Année : 2022

Improvement of anaerobic digestion of lignocellulosic biomass by coupling fungal and chemical pretreatments

Résumé

Anaerobic digestion of abundantly available agricultural residues could be a solution to the two biggest challenges facing mankind - treating waste and producing energy. But the complexity and heterogeneity of the lignocellulosic biomass pose a major hindrance for its degradation and its valorization. An efficient pretreatment step can help to deconstruct the complex biomass structure and enhance the surface area for enzyme accessibility and microbial attack. Conventional pretreatment technologies like biological pretreatment and chemical pretreatment suffer significant disadvantages such as long residence period and production of inhibitors respectively. Thus, combined pretreatment strategies help to lower the severity of the drawbacks of a single pretreatment step by reducing the inhibitor production, the time required for a sole pretreatment step, and the chemical and/or energy demand required while increasing the biofuel output. Aerobic fungal pretreatment has attracted attention due to its low energy demand and because of the ability of fungi to selectively degrade lignin and hemicellulose. Oyster mushroom mycelium residues after harvesting of fruiting bodies are an interesting source of inoculum for the biological pretreatment method because of its oxidative ligninolytic system. The oyster mushroom production process generates a huge amount of mushroom spent straw which is seen to be a good substrate for biogas production. After two harvest cycles of mushroom, the spent mushroom straw generated shows a 22.5% reduction in lignin content and biomethane yield reached 203 NmLCH4/ gVS, which is 38% higher compared to straw without pretreatment. For the chemical approach, oxidants pretreatment that mimics the Fenton-like reaction involved in wood decay by fungi was seen to reduce the lignin content by 26.4% and produce a biomethane yield of 278 NmLCH4/ gVS. The potential of coupling fungal pretreatment with chemical pretreatment has been poorly studied but their synergy appears to be promising for improving the fiber degradation process for methanization. Further, bioaugmentation with anaerobic fungi could help to increase the hydrolysis rates and therefore the methane yield of wheat straw.
Fichier principal
Vignette du fichier
PO026_Shruthi MEENAKSHISUNDARAM_final.pdf (6.75 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-04227252 , version 1 (03-10-2023)

Identifiants

  • HAL Id : hal-04227252 , version 1

Citer

Shruthi Meenakshisundaram, Antoine Fayeulle, Estelle Léonard, Claire Ceballos, Xiaojun Liu, et al.. Improvement of anaerobic digestion of lignocellulosic biomass by coupling fungal and chemical pretreatments. 4 th International Conference on Biogas Microbiology, May 2022, Braga, Portugal. ⟨hal-04227252⟩
24 Consultations
8 Téléchargements

Partager

Gmail Facebook X LinkedIn More