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Treatment of tunnel wash water and implications for its disposal
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering.
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2014 (English)In: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732, Vol. 69, no 10, 2029-2035 p.Article in journal (Refereed) Published
Abstract [en]

The use of road tunnels in urban areas creates water pollution problems, since the tunnels must be frequently cleaned for traffic safety reasons. The washing generates extensive volumes of highly polluted water, for example, more than fivefold higher concentrations of suspended solids compared to highway runoff. The pollutants in the wash water have an affinity for particulate material, so sedimentation should be a viable treatment option. In this study, 12 in situ sedimentation trials were carried out on tunnel wash water, with and without addition of chemical flocculent. Initial suspended solids concentration ranged from 804 to 9,690 mg/L. With sedimentation times of less than 24 hours and use of a chemical flocculent, it was possible to reach low concentrations of suspended solids (< 15 mg/L), PAH (< 0.1 mu g/L), As (< 1.0 mu g/L), Cd (< 0.05 mu g/L), Hg (< 0.02 g/L), Fe (< 200 mu g/L), Ni (< 8 mu g/L), Pb (< 0.5 mu g/L), Zn (< 60 mu g/L) and Cr (< 8 mu g/L). Acute Microtox (R) toxicity, mainly attributed to detergents used for the tunnel wash, decreased significantly at low suspended solids concentrations after sedimentation using a flocculent. The tunnel wash water did not inhibit nitrification. The treated water should be suitable for discharge into recipient waters or a wastewater treatment plant.

Place, publisher, year, edition, pages
2014. Vol. 69, no 10, 2029-2035 p.
Keyword [en]
metals, Microtox, nitrification, polycyclic aromatic hydrocarbons (PAH), sedimentation, toxicity
National Category
Ecology Water Engineering
URN: urn:nbn:se:kth:diva-149243DOI: 10.2166/wst.2014.113ISI: 000338990400007ScopusID: 2-s2.0-84901820723OAI: diva2:738536

QC 20140818

Available from: 2014-08-18 Created: 2014-08-18 Last updated: 2014-08-18Bibliographically approved

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Renman, Gunno
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