1. Enrichment and balancing of nutrients for improved methane production using three compositionally different agro-livestock wastes: Process performance and microbial community analysis.
- Author
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Pan, Shiyou, Zabed, Hossain M., Li, Zhenchong, Qi, Xianghui, and Wei, Yutuo
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ANIMAL waste , *POULTRY manure , *AGRICULTURAL wastes , *MICROBIAL communities , *METHANE , *METHANOGENS , *ANAEROBIC digestion - Abstract
[Display omitted] • Co-digestion of 45.7% BPS, 26.2% SCB and 28.1% CM produced 186.5 mL/g VS methane. • This co-digestion strategy provided a synergistic effect of 37.1% on methane yield. • A higher microbial diversity was found in co-digestion due to the balanced nutrition. • The predominant microorganisms in co-digestion were Choroflexi with a proportion of 39.3%. • Enriched hydrogenotrophic Methanobacterium and Methanolinea were found at high OLR. Balanced nutrition is important for maximizing anaerobic digestion (AD) performance. Herein, the strategy of balancing sugar-fiber-nitrogen nutrients was first established for improved methane production by co-digesting two agricultural and one livestock wastes with complementary compositional properties, such as banana pseudo-stem (BPS), sugarcane baggage (SCB), and chicken manure (CM) having high sugar, fiber and nitrogen contents, respectively. The maximum methane yield was 186.5 mL/g VS added with a mixture of 45.7% BPS, 26.2% SCB and 28.1% CM (with 1: 11.3: 0.3 of sugar to fiber to nitrogen ratio), increasing by 16.1%, 53.3%, 122.6% than those of mono- BPS, SCB, and CM, respectively. The co-digestion process remained stable under an organic load of 4 g VS/(L·day), which was attributed to the predominant presence of Bacteroidetes, Proteobacteria, Thauera , uncultured_bacterium_p_Aegiribacteria , and hydrogenotrophic methanogens. This study provides a deeper understanding of the co-digestion with agricultural and livestock wastes from the perspective of nutrient balance. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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