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En undersökning av Rönningesjöns miljötillstånd, särskilt när det gäller metaller
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
2018 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesisAlternative title
An investigation of the environmental state of lake Rönningesjön, especially about metals (English)
Abstract [sv]

Rönningesjön är en sprickdalssjö, som påverkas av lerslätter runt sjön. pH ligger mellan 7,1 och 7,7. Sjön är starkt eutrofierad. Den påverkas också av vägarna runt omkring. Det tillrinnande vattnet innehåller mycket salt från kringliggande vägar. Från bilarna kommer också metaller. I detta projekt mätas koppar, krom och bly. Den större delen av metallerna kommer med dagvattnet till Löttingelunds våtmark och följer sedan med vattnet genom sjön och ut i Hägernäsviken, som är en del av Östersjön. De sedimenterar delvis i sjön. Koncentrationerna av metallerna är alldeles för höga i vattnet. Metaller finns också lagrade i sedimenten. Sedimenteringsdammar bör anläggas för dagvattnet för att avlägsna de partikelbundna metallerna.

Abstract [en]

Lake Rönningesjön lies in a geological fault (a crack) and it is affected by the clay in the surrounding fields. The pH-values lie within the interval 7.1–7.7. The lake is also impacted by the roads around the lake. The incoming water contains large amounts of road salt. From the cars also large amounts of metal ions are transported by the incoming storm water. In this project copper, chromium and lead are measured. Most of the metals in the lake pass through the wetland at Löttingelund in one end of the lake and flows through the lake to the outlet, which delivers the metal ions into Hägernäsviken, which is a part of the Baltic Sea. However, a part of the metal ions are precipitated in the lake. The concentrations of metal ions in the lake water are too high. Metal ions are also stored in the sediments. Special dams should be constructed to remove particle bound metals from the storm water, by sedimentation.

Place, publisher, year, edition, pages
2018.
Keywords [sv]
kemiska analyser, transport, koppar, krom, bly
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-240307OAI: oai:DiVA.org:kth-240307DiVA, id: diva2:1270967
Educational program
Bachelor of Science in Engineering - Chemical Engineering
Available from: 2018-12-14 Created: 2018-12-14 Last updated: 2018-12-14Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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