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Effects of microbial spatial distribution on organic biodegradation and immobilization of trace metals in co-contaminated soils
Computers and Geotechnics ( IF 5.3 ) Pub Date : 2021-03-03 , DOI: 10.1016/j.compgeo.2021.104063
Shakil A. Masum , Hywel R. Thomas

Predicting the transport and fate of organic and inorganic contaminants in co-contaminated soils is challenging, since various complex, inter-related processes are involved. In the presence of soil microbes that metabolise organic compounds (e.g., phenol), the chemical and the physical properties of the soil may alter and consequently affect the transport of inorganic trace metals e.g., Cu, Cd, Ni, Pb. However, the impact of their spatial distributions on the co-transport processes are still poorly understood and rarely available in literature. Here, we distribute the microbial colonies spatially in uniform and various non-uniform configurations and observe that the transport of weakly-sorbed Cd and Ni is greatly influenced by the distance of the colonies from the contaminant source rather than the size of the colonies. Whereas, for strongly-sorbed Pb and Cu, both the distance and the size are important. The spread of phenol in the model domain was substantially restricted by distributing the colonies more towards the transverse direction than in the longitudinal direction of the groundwater flow. In the context of co-contaminated soil remediation, this study demonstrates that optimum and efficient spatial distribution patterns can be obtained to restrict the spread of both organic and inorganic contaminants, with subsequent reduced environmental impacts.



中文翻译:

微生物空间分布对共污染土壤中有机金属降解和微量金属固定化的影响

由于涉及到各种复杂的,相互关联的过程,因此预测有机污染物和无机污染物在共污染土壤中的运输和命运将具有挑战性。在土壤微生物代谢有机化合物(例如苯酚)的情况下,土壤的化学和物理性质可能会发生变化,从而影响无机微量金属的运输,例如,铜,镉,镍,铅 然而,它们的空间分布对共同运输过程的影响仍然知之甚少,在文献中很少见。在这里,我们将微生物菌落在空间上以均匀和各种非均匀的配置进行分布,并观察到弱吸附的Cd和Ni的运输受到菌落到污染物源的距离而不是菌落大小的很大影响。而对于强吸附的Pb和Cu,距离和尺寸都很重要。苯酚在模型域中的扩散受到了很大的限制,这是因为菌落更多地沿横向分布,而不是沿地下水流动的纵向分布。在共同污染的土壤修复中,

更新日期:2021-03-03
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