生活垃圾厌氧堆肥产甲烷特性研究

Characterization of methane generation in anaerobic digestion for municipal solid waste

为了更好地利用厌氧处理产生的气体,在介绍模拟厌氧堆肥试验的基础上,对厌氧堆肥产甲烷的基本特性进行了研究。结果表明,在厌氧堆肥开始阶段20d左右,甲烷只有7.8%(质量分数,下同)左右,远远低于32.8%的二氧化碳;而随着反应的进行,二氧化碳呈下降趋势,甲烷先升高后降低,直到反应进行到第70天左右时,甲烷才逐渐高于二氧化碳,并于第90天左右时达到最高值42.0%;此后二氧化碳及甲烷都逐渐降低,但甲烷始终高于二氧化碳。

Aiming to employ the biogas producing from the anaerobic digestion of municipal solid waste better, this paper described the basic features of anaerobic digestion which producing methane based on the bench-scale composting experiment. The result revealed that the concentration of CH4 is only 7.8% in the initial phase, far below the concentration of CO2 which is 32.8%. With the processing of the reaction, the concentration of CO2 demonstrated a decreasing trend, while the concentration of methane increased firstly but decreased subsequently. The concentration of methane finally surpassed CO2 until the reaction went to 70 days. The concentration of methane mounted its peak in 90 days, which is 42.0%, the concentration of CO2 and CH4 decreased subsequently after the peak, however, the concentration of CH4 surpassed CO2 all the time.