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Disentangling microbial niche balance and intermediates' trade-offs for anaerobic digestion stability and regulation.
Xiao, Yihang; Mackey, Hamish R; Tang, Wentao; Lu, Hui; Hao, Tianwei.
Afiliación
  • Xiao Y; Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Macau, China.
  • Mackey HR; Department of Civil and Natural Resources Engineering, University of Canterbury, Christchurch, New Zealand.
  • Tang W; Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China.
  • Lu H; School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, China.
  • Hao T; Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Macau, China. Electronic address: twhao@um.edu.mo.
Water Res ; 261: 122000, 2024 Sep 01.
Article en En | MEDLINE | ID: mdl-38944003
ABSTRACT
Anaerobic digestion (AD) is a key technology for converting organic matters to methane-rich biogas. However, nutrient imbalance can destabilize the whole digestion. To realize stable operation of AD and improve its efficiency, this work considers a new strategy to control the intermediate concentrations of poor AD under nutrient stress. For this purpose, long-term digestion under different nutrient conditions was investigated. Results showed that the feedstock with a low C/N ratio (= 6) caused VFA accumulation (2072 ± 632 mg/L), leading to the inhibition of methane production. Employing a substrate with a higher C/N ratio (= 11) and/or adding NH4HCO3 (200 mg NH4+-N/Ladd) could alleviate the VFA inhibition, but excessive dosage of NH4HCO3 would induce ammonia inhibition. Through the established digestion balance between free ammonia nitrogen (FAN) between 0 and 25 mg/L, volatile fatty acid (VFA) 510-2100 mg/L, and alkalinity (ALK) 3300-7800 mg/L, an efficient methane yield of 150-250 mL/g VS was achieved and stable operation of AD under nutrient stress (low C/N ratio) was realized. Metabolic reconstruction between Euryarchaeota sp. MAG162, Methanosarcina mazei MAG53 and Mesotoga infera MAG119 highlighted that microbial niche balance was developed as a result of digestion balance, which is beneficial for stable operation of AD. These findings improved our understanding of the interaction mechanism between intermediates and microbial niches for stability control in AD.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Ácidos Grasos Volátiles / Metano Idioma: En Revista: Water Res Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Ácidos Grasos Volátiles / Metano Idioma: En Revista: Water Res Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Reino Unido