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| Impact of varying particle sizes of cotton stalk biochar on water and solute movement in soil contaminated with polyethylene microplastics |
| Received:December 02, 2024 |
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| KeyWord:polyethylene microplastics;cotton stalk biochar;soil water infiltration;solute transport;pore structure |
| Author Name | Affiliation | E-mail | | JI Hengying | Department of Environmental Science and Engineering, School of Chemistry and Chemical Engineering, Xinjiang Normal University, Urumqi 830054, China | | | YANG Mingyao | Department of Environmental Science and Engineering, School of Chemistry and Chemical Engineering, Xinjiang Normal University, Urumqi 830054, China | | | LI Pan | Institute of Agricultural Resources and Environment, Xinjiang Academy of Agricultural Sciences, Urumqi 830091, China | lipanxj@sina.com |
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| Abstract: |
| To investigate the remediation effects of biochar on microplastic-contaminated soil, this study utilized a soil column experiment to assess the impacts of cotton stalk biochar with varying particle sizes（<0.15 mm and 0.15-1 mm）on the infiltration and solute transport characteristics of soil contaminated with polyethylene（PE）microplastics. The morphological characteristics and pore structures of the different treatment groups were characterized using scanning electron microscopy（SEM）and Brunauer-Emmett-Teller（BET）analysis. The infiltration and solute transport patterns were evaluated using the Philip model and the convection-dispersion equation. The results demonstrated that PE contamination reduced the initial infiltration rate of the soil by 32.98%（to 0.65 cm·min-1）and increased the saturated hydraulic conductivity by 114.3%（to 0.45 cm·h-1）, thereby significantly altering the soil's hydrological properties. The addition of biochar improved the soil structure, with the 0.15-1 mm particle size group exhibiting a more stable pore structure and a higher micropore volume（0.001 814 cm3·g-1）compared to the <0.15 mm particle size group（0.000 957 cm3·g-1）. In PE-contaminated soils, the incorporation of 0.15-1 mm biochar decreased the initial infiltration rate to 1.15 cm·min-1 and reduced the saturated hydraulic conductivity to 0.06 cm· -1, while extending the initial solute breakthrough time to 580 minutes. These findings indicate that biochar particles within the 0.15-1 mm size range effectively enhance water and solute transport characteristics in PE-contaminated soils through the development of stable pore networks. |
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