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| Influence of biochar on biogas infiltration and infiltration reduction effect of clayey and sandy red soil |
| Received:September 05, 2022 |
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| KeyWord:water infiltration|biochar|biogas|infiltration reduction|infiltration model |
| Author Name | Affiliation | E-mail | | CHEN Si | College of Water Resources and Civil Engineering, Hunan Agricultural University, Changsha 410128, China | | | WU Fengping | College of Water Resources and Civil Engineering, Hunan Agricultural University, Changsha 410128, China | wufengping1209@126.com | | WANG Hui | College of Water Resources and Civil Engineering, Hunan Agricultural University, Changsha 410128, China | | | OUYANG Zan | College of Water Resources and Civil Engineering, Hunan Agricultural University, Changsha 410128, China | |
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| Abstract: |
| Regulating the biogas infiltration process in red soil mixed with biochar can provide a scientific basis for slowing down water infiltration in clayey and sandy red soil. In this study, we conducted soil column experiments with different mixing amounts and thicknesses of biochar. We set three mixing amounts（1%, 3%, and 5%）and four mixing thicknesses（5, 10, 15 cm, and 20 cm）of biochar to study the effect of biochar on biogas infiltration and infiltration reduction in clayey and sandy red soil and to select a suitable soil infiltration model for biochar mixing with biogas. In addition, the soil without biochar was set as the control treatment（CK）. The results showed that biochar reduced the transport rate of the red soil wetting peak, reduced the accumulated infiltration, and characterized the infiltration effect on red soil as a reduction of infiltration. For different mixing amounts, the transport rate and cumulative infiltration of red soil wetting fronts decreased with the increase of biochar mixing amount. They reached the minimum value with a 5% mixing amount. For different mixing thicknesses, the transport rate and cumulative infiltration of wetting fronts showed a trend of decreasing first and then increasing with the increase of mixing thickness at 1% and 3% mixing amounts, reaching the minimum value at 10 cm mixing thickness, decreasing by 21.62% and 26.89%, respectively, compared with the CK treatment. Under the 5% mixing treatment, the transport distance and cumulative infiltration of wetting fronts in red soil tended to decrease with increasing mixing thickness and reached the minimum value at 20 cm mixing thickness, decreasing to 35.58% and 45.49%, respectively, compared with the CK treatment. The Philip, Kostiakov, and Horton models were used to simulate the water infiltration process in red soil. The Kostiakov model was better than the other models by comparing model parameters，RMSE and R2. The study showed that biochar inhibited the water infiltration capacity of red soil, slowed down the process of methane water infiltration, and reduced the risk of groundwater pollution. |
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