Hydraulic parameters and statistical residence time distribution moments correlations–a lysimeter study for pesticides mitigation

Wanko, Adrien; Zhang, Jin Bai; Mosé, Robert; Grégoire, Caroline; Sadowski, Antoine

doi:10.1080/03067310902999140

Cited by 3 publications

(2 citation statements)

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“…where Q(t) is the flow rate and M is the total mass of tracer injected in the column. Time moment analysis [24]w a s applied to characterize the shapes of experimental breakthrough curves (BTC) in terms of mean breakthrough time and degree of spreading. Other parameters from RTD analysis could enhance the understanding of the hydrodynamic behaviour of the system [25]: maximum flow velocity (V max ), mean flow velocity (V mean ) and nominal residence time (t N ).…”

Section: Tracer Tests and Residence Time Distribution Analysismentioning

confidence: 99%

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Assessment of rock wool as support material for on-site sanitation: hydrodynamic and mechanical characterization

Wanko

Laurent

Bois

et al. 2015

Environmental Technology

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This study proposes mechanical and hydrodynamic characterization of rock wool used as support material in compact filter. A double-pronged approach, based on experimental simulation of various physical states of this material was done. First of all a scanning electron microscopy observation allows to highlight the fibrous network structure, the fibres sizing distribution and the atomic absorption spectrum. The material was essentially lacunar with 97 ± 2% of void space. Static compression tests on variably saturated rock wool samples provide the fact that the strain/stress behaviours depend on both the sample conditioning and the saturation level. Results showed that water exerts plastifying effect on mechanical behaviour of rock wool. The load-displacement curves and drainage evolution under different water saturation levels allowed exhibiting hydraulic retention capacities under stress. Finally, several tracer experiments on rock wool column considering continuous and batch feeding flow regime allowed: (i) to determine the flow model for each test case and the implications for water dynamic in rock wool medium, (ii) to assess the rock wool double porosity and discuss its advantages for wastewater treatment, (iii) to analyse the benefits effect for water treatment when the high level of rock wool hydric retention was associated with the plug-flow effect, and (iv) to discuss the practical contributions for compact filter conception and management.

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Section: Tracer Tests and Residence Time Distribution Analysismentioning

confidence: 99%

“…where σ 2 θ is the dimensionless RTD variance obtained by the ratio between the RTD first-order and second-order time moments. [24]…”

Section: Tracer Tests and Residence Time Distribution Analysismentioning

confidence: 99%