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Influence of Temperature and De-Icing Salt on the Sedimentation of Particulate Matter in Traffic Area Runoff

Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coulombwall 3, 85748 Garching, Germany
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Water 2018, 10(12), 1738; https://doi.org/10.3390/w10121738
Received: 8 November 2018 / Revised: 18 November 2018 / Accepted: 21 November 2018 / Published: 27 November 2018
(This article belongs to the Section Water and Wastewater Treatment)
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Abstract

Stormwater quality improvement devices use sedimentation as a pre-treatment step to separate contaminant laden particulate matter (PM) from traffic area runoff. Multiple studies describe worse settling behavior during the cold season. This paper is written in response to a decreased PM retention that was observed in the cold season during a 20-month monitoring of a sedimentation tank. However, the data was insufficient to assess the two factors that influence sedimentation during the cold season—temperature and de-icing salt application. Therefore, simplified discrete particle settling models were used to determine the influence of temperature and de-icing salt. These influences were compared to other factors, like overflow rate, particle density, and particle size distribution. To calculate the effect of temperature and de-icing salt on density and viscosity, two empirical models were applied for the first time in this field. The calculations showed that de-icing salt (NaCl) had a negligible influence on the retention of PM. However, reducing the temperature from 20 °C to 5 °C was shown to decrease the total suspended solid removal efficiency by up to 8%. The order of influencing factors was found to be particle size distribution >> overflow rate > particle density > temperature. View Full-Text
Keywords: traffic area runoff; road runoff; sedimentation; stormwater treatment; de-icing salt; cold season; viscosity; stormwater quality improvement device; SQID traffic area runoff; road runoff; sedimentation; stormwater treatment; de-icing salt; cold season; viscosity; stormwater quality improvement device; SQID
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Rommel, S.H.; Helmreich, B. Influence of Temperature and De-Icing Salt on the Sedimentation of Particulate Matter in Traffic Area Runoff. Water 2018, 10, 1738.

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