Revealing the correlation of biomethane generation, DOM fluorescence, and microbial community in the mesophilic co-digestion of chicken manure and sheep manure at different mixture ratio

• Published in: Environmental science and pollution research international 2019-07, Vol.26 (19), p.19411-19424
• Main Authors: Song, Liuying, Li, Dunjie, Fang, Hongli, Cao, Xiangyunong, Liu, Rutao, Niu, Qigui, Li, Yu-You
• Format: Article
• Language: English
• Subjects: Anaerobiosis; Animals; Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Biodegradation; Biofuels - analysis; Biogas; Bioreactors - microbiology; Chickens; Communities; Correlation analysis; Digestion; Dissolved organic matter; Earth and Environmental Science; Ecotoxicology; Emission analysis; Environment; Environmental Chemistry; Environmental Health; Environmental science; Fluorescence; Humic Substances - analysis; Kinetics; Lag phase; Manure - analysis; Manure - microbiology; Manures; Methane - biosynthesis; Methanogenic bacteria; Microbiomes; Microbiota - genetics; Microorganisms; NADH; Nicotinamide adenine dinucleotide; Poultry manure; Research Article; Sheep; Sheep manure; Waste Water Technology; Water Management; Water Pollution Control
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-019-05175-1

Batch co-digestion tests of chicken manure (CM) and sheep manure (SM) at different ratio ( R s/c ) were conducted under mesophilic condition (35 °C). Batch kinetic analysis of bioCH 4 production, excitation-emission matrix (EEM) fluorescence of dissolved organic matter (DOM), and microbial community were investigated. The well-fitted modified Gompertz model ( R 2 , 0.98–0.99) resulted that the co-digestion markedly improved the methane production rate and shortened the lag phase time. The highest bioCH 4 yield of 219.67 mL/gVS add and maximum production rate of 0.378 mL/gVS add /h were obtained at an optimum R s/c of 0.4. Additionally, a significant variation of DOM was detected at the R s/c of 0.4 with a consistent degradation of soluble microbial byproduct-like and protein-like organics. The positive synergy effects of co-digestion conspicuously enhanced the bioCH 4 production efficiency. FI 370 and NADH were significantly correlated to R s/c ( p < 0.05). Moreover, the correlations among process indicator, EEM-peaks and different environmental parameters were evaluated by Pearson correlation analysis. The high diversity of acetoclastic methanogens and hydrogenotrophic methanogens in the co-digestion improved the stability of process. Graphical Abstract