餐厨垃圾厌氧发酵产沼气潜力及其动力学研究

Potential and Dynamics of Biogas Production by Anaerobic Fermentation of Food Waste

采用全自动甲烷潜力测试系统(AMPTS)考察中温(37℃)和常温(25℃)条件下餐厨垃圾厌氧发酵产沼气的潜力,同时建立其动力学模型。研究结果表明:相比于常温,中温下餐厨垃圾厌氧发酵日甲烷产量峰值提高116.8%,累积甲烷产量提高143.9%,且产气周期缩短,物料降解率提高;利用Cheynoweth方程对中温厌氧发酵产甲烷过程进行动力学分析,所建模型相关系数R2>0.95,拟合结果与试验数据较为接近,说明Cheynoweth方程能够较好地反映餐厨垃圾产甲烷的规律。研究结果为餐厨垃圾厌氧发酵处理提供设计和运行依据。

The biochemical methane potential (BMP) of food waste was determined in batch assays under mesophilic temperature (37 益) and room temperature (25 益) using the Automatic Gas Potential Test System (AMPTS). The methanogenesis dynamical model of food waste under mesophilic temperature was further established. The results showed that the maximum daily methane yield and cumulative production were increased by 116.8% and 143.9% respectively under mesophilic temperature, compared to those under room temperature. The increase of temperature also helped to shorten methane production cycle and improve material degradation rate. The Cheynoweth equation was applied to simulate the process of methane production. The results showed that methane production process was highly correlated to the Cheynoweth equation with a correlation coefficient greater than 0.95, indicating that the equation could be used to describe the BMP of food waste. The results could provide theoretical applying foundation for biogas producing by anaerobic digestion with food waste.