Jumbo Raphael B, Booth Colin, Abbey Samuel
School of Engineering, College of Arts, Technology and Environment, University of the West of England, Bristol BS16 1QY, UK.
Centre for Architecture and Built Environment Research (CABER), College of Arts, Technology and Environment, University of the West of England, Bristol BS16 1QY, UK.
Materials (Basel). 2024 Oct 19;17(20):5108. doi: 10.3390/ma17205108.
This study investigated the structural and environmental recovery of weathered hydrocarbon-contaminated soils using low-carbon solutions and aimed to ascertain the suitability of the remediated soils for engineering purposes. 25% (/) of ground ripe (RPP) and unripe (UPP) waste plantain peels were each added to 1 kg weathered hydrocarbon-contaminated soil samples and monitored for 90 days. Biological, physicochemical, and engineering properties were analysed for all samples in triplicates. After 90 days of remediation, RPP and UPP nutrients degraded the mid-distillate hydrocarbon alkanes by 93% and 88%, while the heavier hydrocarbon alkanes were degraded by 83% and 85%, respectively. The polyaromatic hydrocarbons (PAHs) had 89% and 93% degradation for RPP and UPP-treated soils, respectively, while the natural attenuation sample had 28% degradation. The soil compressive strength increased by 16% and 19% for RPP and UPP-treated soils, respectively, whereas the natural attenuation soil compressive strength remained fairly constant. It was observed that the remediated soil cohesion, angles of internal friction, maximum dry density, and optimum moisture content all improved as the remediation proceeded, which subsequently showed that the remediation influenced the engineering properties of the contaminated soils. Therefore, the remediation of the contaminated soil improved the structural suitability of the soils.
本研究使用低碳解决方案调查了风化的碳氢化合物污染土壤的结构和环境恢复情况，旨在确定修复后的土壤用于工程目的的适用性。将25%（/）的成熟（RPP）和未成熟（UPP）废弃芭蕉皮分别添加到1千克风化的碳氢化合物污染土壤样品中，并监测90天。对所有样品的生物、物理化学和工程性质进行了一式三份的分析。修复90天后，RPP和UPP养分使中间馏分碳氢化合物烷烃降解了93%和88%，而较重的碳氢化合物烷烃分别降解了83%和85%。多环芳烃（PAHs）在RPP和UPP处理的土壤中的降解率分别为89%和93%，而自然衰减样品的降解率为28%。RPP和UPP处理的土壤的抗压强度分别提高了16%和19%，而自然衰减土壤的抗压强度保持相当稳定。观察到随着修复的进行，修复后土壤的内聚力、内摩擦角、最大干密度和最佳含水量均有所改善，这随后表明修复影响了污染土壤的工程性质。因此，污染土壤的修复提高了土壤的结构适用性。
