Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 418, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.126091
Keywords
Polycyclic aromatic hydrocarbons; Lignocellulosic biomass; Microbial consortium; Toxicity; Anaerobic digestion
Categories
Funding
- National Key R&D Program of China [2018YFE0107100]
- National Natural Science Foundation of China [31772529]
- Priority of Academic Program Development of Jiangsu Higher Education Institutions (PAPD) [4013000011]
- Egyptian Ministry of Higher Education & Scientific Research (MHESR), Support of Excellent Students Projects (SESP), Egypt
- Taif University Researchers Supporting Project, Taif University, Taif, Saudi Arabia [TURSP-2020/95]
- Operational Programme Competitiveness, Entrepreneurship and Innovation (NSRF) [MIS-5002495]
- European Union (European Regional Development Fund)
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This study demonstrates the successful degradation of birchwood sawdust using a novel bacterial consortium SST-4, which can concurrently remove lignocellulose and creosote compounds, leading to efficient bioenergy production.
Lignocellulosic biomass represents an unlimited and ubiquitous energy source, which can effectively address current global challenges, including climate change, greenhouse gas emissions, and increased energy demand. However, lignocellulose recalcitrance hinders microbial degradation, especially in case of contaminated materials such as creosote (CRO)-treated wood, which necessitates appropriate processing in order to eliminate pollution. This study might be the first to explore a novel bacterial consortium SST-4, for decomposing birchwood sawdust, capable of concurrently degrading lignocellulose and CRO compounds. Afterwards, SST-4 which stands for molecularly identified bacterial strains Acinetobacter calcoaceticus BSW-11, Shewanella putrefaciens BSW-18, Bacillus cereus BSW-23, and Novosphingobium taihuense BSW-25 was evaluated in terms of biological sawdust pre-treatment, resulting in effective lignocellulose degradation and 100% removal of phenol and naphthalene. Subsequently, the maximum biogas production observed was 18.7 L/kg VS, while cumulative methane production was 162.8 L/kg VS, compared to 88.5 without microbial pre-treatment. The cumulative energy production from AD-I and AD-II through biomethanation was calculated as 3177.1 and 5843.6 KJ/kg, respectively. The pretreatment process exhibited a significant increase in the energy yield by 83.9%. Lastly, effective CRO detoxification was achieved with EC50 values exceeding 90%, showing the potential for an integrated process of effective contaminated wood management and bioenergy production.
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