Abstract
The quality of ensiling is greatly influenced by the utilization rate of organic matter in the ensiling system. Peanut shell (PS) and distillers' grains (DG) are common and abundant types of food waste. To investigate the optimal carbon-to-nitrogen (C/N) ratio for co-ensiling, PS was added to DG at various C/N ratios: C/N20 (PD20), C/N25 (PD25), C/N30 (PD30), and C/N35 (PD35). The findings revealed that PD25 achieved the highest utilization rate of organic matter. PD25 exhibited a minimal organic dry matter loss of only 2.02% and a lactic acid yield of 48.04 g/kg of dry matter, which was significantly different from the other groups (P < 0.05). Moreover, employing C/N25 effectively optimized and enhanced the stability of the microbial community structure. With improved organic matter utilization, PD25 exhibited a 33.68% increase in methane production and a 36.11% increase in energy output after ensiling. Taking into account the organic matter loss during ensiling, PD25 attained a methane yield of 187.85 mL/g of organic dry matter, surpassing that of the other treatment groups. These results present novel insights for the high-value utilization of food waste.
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