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Treatment of wash water from road tunnels.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering (moved 20130630).
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Tunnels have become increasingly important in the development of road networks to meet rising transportation demands. Washing of road tunnels must be performed regularly to ensure traffic safety. The washing procedure generates significant amount of polluted wash water. Before discharge to a receiving water body, treatment is necessary to avoid potential degradation of the water quality. In this study, 12 in situ sedimentation experiments were conducted to evaluate treatment efficiency of sedimentation, with and without the addition of chemical flocculent. The findings showed that untreated tunnel wash water was highly polluted with total suspended solids (804-9690 mg/l), PAHs (0.4–29 μg/l) and heavy metals. Most pollutants were associated with the particulate material. Significant correlations (r2 > 0.95) were found between suspended solids and metals. Efficient removal of pollutants was possible by sedimentation with addition of flocculent. Within 20 hours of sedimentation low concentrations were reached of suspended solids (<15mg/l), PAHs (<0.1 μg/l), Cd (<0.05 μg/l), Cr (< 8 μg/l), Hg (<0.02 μg/l), Pb (<0.5 μg/l) and Zn (< 60 μg/l). The results confirm the possibility to treat tunnel wash water with sedimentation and flocculation and to discharge treated wash water to a recipient, provided particular attention is given to very sensitive water bodies.

Place, publisher, year, edition, pages
2012.
Series
TRITA-LWR Degree Project, ISSN 1651-064X ; 2012:42
Keyword [en]
tunnel wash, wash water, water treatment, sedimentation, total suspended solids, highway runoff
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-171816OAI: oai:DiVA.org:kth-171816DiVA: diva2:844623
Educational program
Degree of Master - Water System Technology
Supervisors
Available from: 2015-09-21 Created: 2015-08-07 Last updated: 2015-09-21Bibliographically approved

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fulltext(1684 kB)28 downloads
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File name FULLTEXT01.pdfFile size 1684 kBChecksum SHA-512
45c0592144495318a7fc9ccc41f2d5b4d75d6171e911d0ac3cfa70dd28e5c158e58caa43c797a8a14aad763c01a1a5fdc3c676ca889ea5111b4d35bebf36c68f
Type fulltextMimetype application/pdf

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
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Output format
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