Numerical simulation of polycyclic aromatic hydrocarbons and bacteria co-transport in porous media
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Abstract:
The co-transport of polycyclic aromatic hydrocarbons (PAHs) with bacterial colloids plays a facilitating role in the precise and efficient remediation of PAH pollution. It is crucial to establish an accurate and reliable numerical simulation model for the co-transport of PAHs and bacterial colloids. A numerical model was constructed for the co-transport of fluoranthene (a type of PAH) and bacterium FA1 using the Colloid-Facilitated Solute Transport (C-Ride) module in Hydrus. Uncertainties in the model parameters were analyzed through the Markov Chain Monte Carlo (MCMC) method, allowing for a quantitative depiction of the transport processes of fluoranthene influenced by water dynamics and microbial colloidal interactions.A series of indoor column experiments were conducted to investigate the transport of fluoranthene. The numerical model for the co-transport of fluoranthene and bacterium FA1 was constructed using the Hydrus C-Ride module. The MCMC method was applied to analyze parameter uncertainties, enabling a comprehensive understanding of the transport processes of fluoranthene under the influence of water dynamics and microbial colloidal interactions.The results demonstrated that bacterium FA1 enhanced the migration velocity of fluoranthene in the porous medium and increased the recovery rate of fluoranthene transport within the porous medium. The recovery rate increased from 55.06% to 76.16%. Specifically, the contribution of fluoranthene adsorbed onto mobile colloids and transported with water flow accounted for 41.46% and 34.69% of the recovery rate, respectively.The research findings hold both theoretical and practical significance in guiding the optimization design of microbial remediation strategies for groundwater pollution. The establishment of a numerical model provides a reliable tool for accurately characterizing the co-transport process of fluoranthene and bacterium FA1. These insights shed light on the understanding of PAH transport influenced by microbial colloidal interactions in porous media and contribute to the development of effective and efficient strategies for remediating PAH-contaminated groundwater.
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