几种厌氧消化原料的流变特性及其影响因素

考察了6种厌氧消化原料的流变特性，研究了物料浓度、温度和发酵时间等因素对流变特性的影响，以期为厌氧消化工艺的设计及设备选用提供基础参数。结果表明，猪粪、鸡粪、牛粪、羊粪、鸭粪、兔粪原料均为假塑性流体，且符合幂率方程。随浓度增加原料黏度升高，流变指数降低。随着温度的升高，鸭粪、牛粪、鸡粪的黏度呈线性趋势降低，流变指数升高；猪粪、羊粪、兔粪的黏度呈现先减低后升高的趋势。计算得到鸭粪、牛粪、鸡粪的活化能分别为8.018，11.337，8.285 kJ/mol。随着发酵的进行，鸭粪的黏度下降，趋势与TS（总固体）含量变化基本一致，猪粪、羊粪和牛粪黏度呈现上升的趋势，鸡粪与兔粪的黏度变化不明显。

Rheological properties of several kinds of feedstocks for anaerobic fermentation and their influencing factors

In order to provide a theoretical basis for selecting apparatus and designing processes of anaerobic fermentation, rheological properties of six kinds of feedstock were investigated, and rheological parameters were evaluated at different total solid concentrations, temperatures and fermentation time. The experimental results showed that the six kinds of manures behaved like pseudoplastic fluid and followed the power law model, and the flow behavior index decreased with the increase of concentration. The viscosities of duck manure, cattle manure and chicken manure decreased linearly with the increase of temperature, and the flow behavior index increased. The viscosities of pig manure, sheep manure and rabbit manure reduced at first, and then increased. The calculated activation energy of duck manure, cattle manure and chicken manure were 8.018, 11.337 and 8.285 kJ/mol, respectively. With the processes of fermentation, the viscosity of duck manure declined in the basic trends and showed similar changes with total solids. The viscosities of pig, sheep and cattle manures showed an upward trend, and the change trends of chicken and rabbit viscosities were not obvious.