Terrestrial environment

Treatment of tunnel wash waters - experiments with organicsorbent materials. Part I: Removal of polycyclicaromatic hydrocarbons and nonpolar oil



Received August 08, 2007,Revised April 09, 2008, Accepted , Available online

Volume 20,2008,Pages 964-969

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Tunnel wash waters characterize all waters that run o after washing procedures of tunnels are performed. These waters represent a wide spectrum of organic and inorganic pollutants, such as polycyclic aromatic hydrocarbons (PAHs) and toxic metals. Removal of such contaminants from water runo was investigated using laboratory tests after washing procedure was performed on two road tunnels in eastern Norway (Hanekleiv and Bragernes). Due to diverse character of both, treatment media and treated wash waters, the whole investigation was divided into two separate laboratory experiments. The treatment e ciencies were established based on the levels of concentrations and reductions of the measured contaminants in the e uents released from the tested media. In the first part of the article, the contents of nonpolar oil (NPO), 16 individual PAHs, and total PAHs are described. This part revealed that the combination of two organic sorbent materials provided the highest treatment e ciency for wash waters released from the road tunnel and from electrostatic filters. The greatest reduction levels reached 97.6% for NPO, 97.2% for benzo[a]pyrene, and 96.5% for the total PAHs. In the second part of the article, the concentrations and the removal rates of toxic metals are reported.

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