接种比在中温与低温条件下对猪粪产甲烷潜力的影响研究OACSTPCD

In order to explore the effects of different inoculation ratios on biochemical methane potential(BMP)of pig manure under meso-philic(35±0.5)℃ and low(23±0.5)℃ temperature conditions,the initial volatile solid(VS)concentration was controlled at3％under the tow temperature conditions;and pig manure BMP experiments were carried out according to the ratios of pig manure to inoculum of 1 : 2,1 : 1 and 2 : 1,i.e.,the inoculation ratios(S/I)of 0.5,1.0 and 2.0.The kinetic analysis of methanogenic process was induced.The re-sults showed that cumulative methane production and maximum daily methane production were significantly and positively correlated with the inoculation ratio of pig manure under either mesophilic or hypothermic conditions(P<0.05),but there was no significant difference in the BMP of pig manure under different inoculation ratios(P>0.05).The BMP(using VS as a basis)of pig manure at S/I of 0.5,1.0 and 2.0 under mesophilic conditions were(252.05±5.12)mL/g,(250.07±16.57)mL/g,and(249.65±13.69)mL/g,respectively;and their mean BMP was(250.59±1.28)mL/g.The BMP of pig manure at S/I of 0.5,1.0 and 2.0 under cryogenic conditions were(183.42±9.18)mL/g,(189.02±11.25)mL/g,and(191.88±3.50)mL/g,respectively,and their mean BMP were(188.11±4.31)mL/g.The kinetic studies showed that the modified Gompertz model was more suitable than the logistic model for the kinetic analysis of anaerobic diges-tion of pig feces.The present study showed that there was no significant difference(P>0.05)in the BMP of pig manure at different inocula-tion ratios at medium(35±0.5)℃or low(23±0.5)℃ temperatures when the initial VS level was controlled at3％,and from the perspec-tive of shortening the BMP testing time and improving efficiency,it is recommended that the S/I for pig manure BMP testing be chosen at 0.5.