Épuration en eaux courantes : évaluation et modélisation de la capacité d'oxygénation dans les cascades et les chutes d'eau

Abstract : This work represents a part of polluted watercourses restoration by intensification of self-purification mechanisms essentially the degradation of organic matter and nitrogen. The main objective is to evaluate and model the air-water oxygen transfer by major hydraulic structures, namely stepped cascades and waterfalls. Aeration experiments conducted in a geometrically adjustable laboratory pilot, serving as stepped cascade and waterfall were used to assess the aeration potential of these structures as well as to study the geometrical an operating parameters effects. In a first approach, a global semi-empirical correlation for aeration efficiency calculation in stepped cascades, valid for a wide range of parameters, was developed, depending on water discharge, number of steps and chute slope, basing on our experimental measurements and data collected in publications. The same procedure was followed for developing a semi-empirical correlation to estimate the aeration efficiency of waterfalls in terms of the chute height, downstream water level and flowrate. In order to take into account the oxygen transfer phenomenon characteristics in stepped cascade (water volume and air-water exchange interfacial area), tracer experiments were associated with aeration experiments to allow measuring water volume and correlating the volume oxygen transfer coefficient kLa with the various parameters involved in the aeration mechanism. The interfacial specific area was numerically simulated using VOF approach depending on operating and geometrical parameters. A predictive equation for liquid film transfer coefficient kL calculation based on the parameters of influence was issued from both the simulations and experimental aeration measures
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Hatem Khdhiri. Épuration en eaux courantes : évaluation et modélisation de la capacité d'oxygénation dans les cascades et les chutes d'eau. Autre. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0216⟩. ⟨tel-01751195⟩

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