Self-conditioning of food waste properties to improve methane production in anaerobic digestion
Optimized anaerobic digestion with different waste to regulate the properties of food waste(self-conditioning)can break through the limitations of traditional exogenous substances to regulate the properties of food waste.A response surface methodology was used for batch anaerobic digestion through a three-factor,three-level central composite experimental design to study the optimization of food waste properties to obtain the optimal methane yield,in which methane yield was used as the response factor,and the proportion of fruits and vegetables(mass fraction of dry weight),moisture content and C/N mass ratio(C/N)were selected as the influencing factors of food waste,respectively(the values were based on the range of variation of food waste in Fuzhou City).The results showed that the highest methane yields of 431.74 mL/g(by volatile solids(VS)calculation)and 311.51 mL/g(by dry weight calculation)were obtained when the C/N of food waste was 14.92,the moisture content was 92.0％,and the proportion of fruits and vegetables was 49.0％and 70.0％,respectively.The moisture content and the proportion of fruits and vegetables had a significant effect on methane production and organic matter degradation,while C/N and the interaction between the two factors were not significant as evidenced by analysis of variance;correlation analyses showed a significant positive correlation between the initial VS concentration,the amount of VS degradation and the methane yield,and the correlation between the VS degradation rate and the methane yield was not significan.The methane production was higher in the system with higher organic matter degradation,which was consistent with the methane production pattern.
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