Journal of Lanzhou University of Technology ›› 2021, Vol. 47 ›› Issue (3): 33-39.

• Mechanical Engineering and Power Engineering • Previous Articles     Next Articles

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

LI Jin-ping1,2,3,4, JIANG Qin2,4, HUANG Juan-juan1,2,3,4, WANG Chun-long1,2,3,4   

  1. 1. Western China Energy & Environment Research Center, Lanzhou Univ. of Tech., Lanzhou 730050, China;
    2. Key Laboratory of Complementary Energy System of Biomass and Solar Energy of Gansu Province, Lanzhou Univ. of Tech., Lanzhou 730050, China;
    3. China Northwestern Collaborative Innovation Center of Low-carbon Urbanization Technologies, Lanzhou Univ. of Tech., Lanzhou 730050,China;
    4. College of Energy and Power Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China
  • Received:2020-03-30 Online:2021-06-28 Published:2021-07-19

Abstract: 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.

Key words: cattle manure, anaerobic fermentation process, rheological properties, apparent viscosity, density, gas production law

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