<br>干湿循环下生物炭对土壤多孔介质中微塑料渗透处理的影响及土壤-生物炭混合形式的优化,Science of the Total Environment

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干湿循环下生物炭对土壤多孔介质中微塑料渗透处理的影响及土壤-生物炭混合形式的优化
Science of the Total Environment ( IF 8.2 ) Pub Date : 2024-05-12 , DOI: 10.1016/j.scitotenv.2024.173194
Yixin Li ₁ , Benny Haotian Ding ₁ , Xueyu Geng ₁

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植物生物炭在土壤多孔介质中吸附微塑料颗粒（MP）方面具有良好的前景。然而，生物炭在缓解干湿循环期间（典型的季节性降水和蒸发）MP 垂直渗透方面的功能仍然不确定。此外，很少有研究调查生物炭如何与土壤结合的结构。本研究进行了柱测试，以评估土壤-生物炭多孔介质在饱和和干湿条件下的 MP 保留能力。研究保水性和亲水性，以阐明干湿循环的影响。此外，还比较了不同的生物炭-土壤结构以优化结构设计。如果没有生物炭，干湿循环会导致样品中 MP 的逃逸量增加 8.74%。然而，掺入 15% 的生物炭仅导致废水中的 MP 增加约 2%。生物炭显着增强了土壤的 MP 吸收能力，并减轻了干湿循环的负面影响。生物炭的泡状形态提供了充足的吸附位点并创造了复杂的流动路径。生物炭的亲水基团和微孔的毛细作用有利于干燥过程中较慢的水释放，防止裂纹扩展和 MP 颗粒上的冲洗。生物炭含量越高、孔隙率越低，这种效果越明显。此外，层结构可以改善MP的去除，有利于生物炭功能层的长期性能和管理。

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Effect of biochar on microplastics penetration treatment within soil porous medium under the wetting-drying cycles and optimisation of soil-biochar mixing format

Plant-based biochar was demonstrated promising capability in adsorbing microplastic particles (MPs) within soil porous mediums. However, biochar's function in mitigating MPs' vertical penetration during wetting-drying cycles, typical of seasonal precipitation and evaporation, remains uncertain. Furthermore, few studies have investigated the structures of how biochar combines with soil. This study conducted column tests to assess the MPs retention capabilities of soil-biochar porous media under saturated and wetting-drying conditions. The water retention and hydrophilic properties were investigated to elucidate the impact of wetting-drying cycles. Additionally, different biochar-soil structures were compared to optimise the structural design. Without biochar, wetting-drying cycles resulted in 8.74 % more MPs escaping from samples. However, incorporating 15 % biochar led to only around 2 % more MPs in effluent. Biochar significantly enhanced soil's MP absorption capacity and mitigated the negative effects of wetting-drying cycles. Biochar's alveolate morphology provides ample adsorption sites and creates complex flow paths. The hydrophilic groups of biochar and capillarity by micropores facilitated slower water release during drying, preventing crack propagation and flush on MP particles. This effect was more pronounced with higher biochar content and lower porosity. Moreover, layer structure was found to improve MPs removal, benefiting the long-term performance and management of the biochar functional layer.

更新日期：2024-05-12

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