多元混合物料协同促进厌氧消化产甲烷性能试验研究

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Abstract In order to evaluate the synergistic effects of multiple raw materials anaerobic co-digestion of agricultural and livestock wastes on methane production performance,the tests were conducted under the condition of solid-state (12% total solids) and mesophilic (37±1)℃ to investigate multiple raw materials on methane production performances of anaerobic digestion,and then the dynamic characteristics of producing methane process were analyzed by the modified Gompertz equation.The results showed that synergistic effects obviously occured during the anaerobic co-digestion of three substrates,the synergistic effect of co-digestion contributed to methane yield was significantly (P<0.05) increased by 34.85%~70.39%.A 50:20:30VS ratio of cow manure,vegetable waste and corn straw produced the highest methane yield of 286.0mL/g VS,the highest cumulative methane of 20713mL and the highest VS removal efficiency of 65.6% due to the synergistic effect,increased by 32.9%、229.9% and 82.0% comparing with the cow manure,vegetable waste and corn straw mono-digestion of methane production rate respectively.The analysis results of modified Gompertz equation indicated that the model had feasibility to describe the dynamic process of anaerobic digestion,the R² values of the fitting curves were larger than 0.99.The maximum methane production rate and the shorter lag phase (17.34mL/(d×g) and 2.97d) were achieved from co-digestion of cow manure,vegetable waste and corn straw at mixing ratio of 50:20:30.The experimental study can provide a reference for biogas projects of multiple raw materials anaerobic co-digestion of agricultural and animal husbandry wastes.

Key words： multiple raw materials anaerobic digestion synergistic effect methane production rate cumulative methane production VS degradation rat

Received: 04 August 2017

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