Enhanced Anaerobic Mono-digestion and Co-digestion of Crop Residues by NaOH Alkali Pre-treatment: Digestion Performance and Microbial Community Dynamics

Mohamed Mansour, Orhan Ince, Omer Uzun*, E. Gozde Ozbayram, H. Ibrahim Miraloglu, Bahar Ince

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The main objective of the study was to determine the effect of different dosages of NaOH alkali pre-treatment on the lignocellulosic structures and the methane production of crops’ residues. In this regard, NaOH pre-treatment was implemented with different dosages on three different crops’ residues: wheat, rye, and rice straws. Substrates were soaked into NaOH solutions at different dosages with solid-to-liquid ratios of 100 and 200 gTS/L to investigate both conditions. The anaerobic digestion process was conducted using AMPTS II under mesophilic conditions. By 8% NaOH pre-treatment dosage, the reduction of hemicellulose and lignin was 81 and 62% for rice straw, 86 and 69% for wheat straw, 80 and 74% for rye straw, respectively. The concentrations of sCOD in the liquid fraction after pre-treatment were regarded as 3 times higher than in untreated samples. Pre-treatment with 8% NaOH dosage increased the methane yield of rice, wheat, and rye straws by 55, 40, and 46% respectively. Samples from digesters that produced the highest methane yield were chosen for further molecular analysis. Compared to untreated digesters, 16S rRNA gene amplicon sequencing revealed more diverse microbial communities in NaOH pre-treated digesters. Graphical Abstract: (Figure presented.)

Original languageEnglish
Pages (from-to)3003-3015
Number of pages13
JournalWaste and Biomass Valorization
Volume15
Issue number5
DOIs
Publication statusPublished - May 2024

Bibliographical note

Publisher Copyright:
© The Author(s), under exclusive licence to Springer Nature B.V. 2023.

Funding

This work was funded by Boğaziçi University Research Fund Project (Project code 21YP1).

FundersFunder number
Boğaziçi Üniversitesi

    Keywords

    • Alkaline pre-treatment
    • Anaerobic digestion
    • Lignocellulosic
    • Methane
    • Microbial community
    • Straw

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