Effects of temperature and inoculation ratio on methane production and nutrient solubility of swine manure anaerobic digestion

[Display omitted] •Mesophilic condition was optimal temperature for AD of swine manure.•The maximum cumulative CH4 yield was obtained with F/I ratio of 2.0 and 3.0.•With increase of F/I ratio, the lag phase increased while reaction rate decreased.•AD increased solubility of N, Cu, and Zn while decre...

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Veröffentlicht in:Bioresource technology 2020-03, Vol.299, p.122552-122552, Article 122552
Hauptverfasser: Cao, Leipeng, Keener, Harold, Huang, Zhenghua, Liu, Yuhuan, Ruan, Roger, Xu, Fuqing
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Sprache:eng
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Zusammenfassung:[Display omitted] •Mesophilic condition was optimal temperature for AD of swine manure.•The maximum cumulative CH4 yield was obtained with F/I ratio of 2.0 and 3.0.•With increase of F/I ratio, the lag phase increased while reaction rate decreased.•AD increased solubility of N, Cu, and Zn while decreased that of P.•Changes of nutrient solubility were generally more significant at high F/I ratio. This study investigated the effects of temperature and volatile solids (VS) ratio of feedstock to inoculum (F/I ratio) on methane (CH4) production and the solubility of nitrogen (N), phosphorus (P), cooper (Cu), and Zinc (Zn) after anaerobic digestion (AD) of swine manure. The highest cumulative CH4 yield of 470 L/kgVSfeed was obtained with F/I ratios of 2.0 and 3.0 with mesophilic (37 °C) temperature, and methane production rate decreased with the increase of F/I ratio. As F/I ratio increased from 0.5 to 4.0, the lag phase for methane production increased from 1.02 days to 13.52 days, indicating an initial inhibition at high F/I ratios. AD increased the concentrations of ammonia, Cu and Zn in the AD effluent supernatant, while decreased total and water extractive P concentrations. The changes of ammonia, Cu, Zn, and P concentrations were more significant with the increase of F/I ratio.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2019.122552