Numerical modeling analysis of VOC removal processes in different aerobic vertical flow systems for groundwater remediation

摘要: Vertical flow systems filled with porous medium have been shown to efficiently remove volatile organic contaminants (VOCs) from contaminated groundwater. To apply this semi-natural remediation strategy it is however necessary distinguish between removal due biodegradation and losses the atmosphere. Especially for (potentially) toxic VOCs, latter needs be minimized limit atmospheric emissions. In study, numerical simulation was used investigate quantitatively of compounds in two pilot-scale water treatment systems: an unplanted vertical filter a planted one, which could also called constructed wetland, both These were intermittently loaded containing benzene MTBE as main VOCs. The highly dynamic but permanently unsaturated conditions facilitated aerobic lead emissions contaminants. Experimental data material analyses, rate measurements, solute tracer gas test, well contaminant concentration measurements at boundaries constrain reactive transport modeling approach. Numerical simulations considered flow, species aqueous phase degradation processes, made possible quantify rates calculating their contribution total removal. A range determined using experimental results under operation modes validated by field obtained different applied filters. For filters, point high rates, if filters had time build up capacity. case are negligible can attributed biodegradation, only. study thus supports use these groundwater VOCs assessment performance systems.