Abstract
The predominant techniques used for road runoff treatment are sedimentation and filtration. In filtration systems, the ability of the media to adsorb the contaminants is a finite process. Consequently, construction, operation and maintenance managers of such systems should know in advance the service life, i.e., when the used medium should be replaced, and associated costs of operation and maintenance. A batch experiment followed by a packed bed reactor (PBR) experiment addressed the kinetics of the studied media argon oxygen decarburization slag (AOD) and Polonite, followed by the development of a 1D-model to describe the change of concentration of Cu and Zn within time. The batch test results showed that Cu and Zn adsorption followed the Freundlich isotherms for AOD and Polonite. Those results coupled with the linear driving force model and the developed model resulted in good agreement between the PBR results and the simulation. The model was capable to predict (i), the service life at the hydraulic load of 0.18 m/h for AOD (Cu: 395 d; Zn: 479 d) and Polonite (Cu: 445 d; Zn: 910 d), to show (ii) the profile concentration in the PBR within time and the gradient of the concentration along the height of the reactor.
Highlights
The pollutants transported by runoff from motorways and roads with intense vehicular traffic has been a subject of study in many countries over the past four decades (e.g., [1,2,3])
The argon oxygen decarburization slag (AOD) utilized in the present study showed better performance for removal of Zn but lower performance for Cu compared to those mentioned slags
The adsorption kinetics followed the Freundlich isotherm model for all cases and from which it was deduced that the adsorption process in AOD and Polonite is due to the heterogeneous surface of the media
Summary
The pollutants transported by runoff from motorways and roads with intense vehicular traffic has been a subject of study in many countries over the past four decades (e.g., [1,2,3]). Framework Directive states that all bodies of water must achieve good conditions [12] This means that discharged stormwater should not affect the quantity, quality, or ecology of waterbodies. A regional background value is typical for water that is unaffected by point-source pollution or acidification, may have been affected by the deposit of combustion residues from fossil and other fuels as well as diffuse emissions from agriculture and forestry. Such values, for e.g., metals, are considered rather as reference values for the current situation in the recipient water [14].
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