| Analysis and numerical simulation of factors influencing the hole application infiltration of biogas slurry |
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| DOI：10.7606/j.issn.1000-7601.2018.06.03 |
| Key Words: hole irrigation of biogas slurry numerical simulation wetting front infiltration rate cumulative infiltration |
| Author Name | Affiliation | | ZHENG Jian | China Western Research Center of Energy & Environment, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
Gansu Key Laboratory of Complementary Energy System of Biomass and Solar Energy, Lanzhou, Gansu 730050, China
College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050,China | | ZHOU Peng-jie | Gansu Key Laboratory of Complementary Energy System of Biomass and Solar Energy, Lanzhou, Gansu 730050, China
College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050,China | | ZHANG Yan-ning | Gansu Key Laboratory of Complementary Energy System of Biomass and Solar Energy, Lanzhou, Gansu 730050, China
College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050,China | | YIN Li-gao | Gansu Key Laboratory of Complementary Energy System of Biomass and Solar Energy, Lanzhou, Gansu 730050, China
College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050,China | | ZHANG En-ji | Shaanxi Provincial Land Engineering Construction Group, Xi’an, Shaanxi 710075, China |
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| Abstract: |
| Hole application of biogas slurry is an fertigation technology under research now. To explore the effect of water ratio, hole size, and soil bulk density on soil water infiltration around the irrigation hole after hole application of biogas slurry, a series of experiments were conducted to study the influencing factors. Meanwhile, the process of soil water infiltration was simulated using software, COMSOL Multiphysics. The treatments included 3 volume ratios of biogas slurry:water (1∶4, 1∶6, and 1∶8), and a control (water only), three hole diameters (3 cm, 5 cm, and 7 cm) and two soil bulk densities (1.35 and 1.45 g·cm-3).Results showed that the infiltration rate, the cumulative infiltration, and the volume of the wetting body increased with increasing the hole diameter after the same infiltration time, but decreased with increasing soil bulk density and the slurry: water ratio. However, the ratio of the horizontal infiltration distance to vertical infiltration depth decreased with increasing hole diameter. The wetting body shape transformed from a spheroid with greater horizontal axis than the vertical axis to that with shorter horizontal axis than the vertical axis. In the case with higher soil bulk density, the cumulative infiltration in unit time was increased by increasing the hole diameter and reducing the biogas slurry:water ratio. The wetting front was advancing faster at the initial stage of hole irrigation but slowed down later and then approached steady state. Our results concluded that the process of the wetting front movement and soil moisture content variation in the wetting body can be simulated with the software, COMSOL Multiphysics. |
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