牛粪高温厌氧发酵过程中的流变特性及产气规律

为研究厌氧发酵过程中高浓度发酵原料流变特性的变化,使用HYND-50振动式在线黏度计测量初始总固体质量分数分别为8%和15%时牛粪高温厌氧发酵产沼气过程的流变特性,研究温度和厌氧消化时间对流变特性和产气规律的影响.结果表明:在相同升温范围内,初始总固体质量分数越大,牛粪的活化能越大,流动性越差.在厌氧发酵过程中,牛粪的表观黏度随厌氧消化时间减小,随初始总固体质量分数增加而增大;密度随厌氧消化时间先增大后减小,随初始总固体质量分数增加而增大.随着初始总固体质量分数的增大,牛粪的最大日产气量、累计产气量和累计产甲烷量升高,初始总固体质量分数为15%时的量分别是8%时的1.29、1.24和1.25倍.

Rheological properties and gas production law of cattle manure during anaerobic fermentation process at thermophilic temperature

In order to study the rheological properties of high concentration fermentation raw materials during anaerobic fermentation process, the HYND-50 vibration online viscometers were used to measure the rheological properties of cattle manure with initial total solid mass fraction of 8% and 15% during the process of anaerobic fermentation biogas production at thermophilic temperature, and the effects of temperature and anaerobic digestion time on its rheological properties and gas production law were studied. The results demonstrated that within the same temperature rising range, the greater the initial total solid mass fraction of cattle manure was, the greater the activation energy was and the worse the fluidity was. During the process of anaerobic fermentation, the apparent viscosities decreased with the anaerobic digestion time, and increased with the increase of initial total solid mass fraction, the densities increased first, then decreased with the anaerobic digestion time and increased with the increase of initial total solid mass fraction. With the increase of initial total solid mass fraction, the maximum daily gas production, cumulative gas production and cumulative methane production increased, when initial total solid mass fraction was 15%, they were 1.29, 1.24 and 1.25 times of which when it was 8% respectively.