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Understanding metal concentration and speciation in motorway runoff
Julia Zakharova1, Hamid Pouran1, John Bridgeman2
1Faculty of Science and Engineering, University of Wolverhampton, Wolverhampton, UK.
Environmental Technology
|November 12, 2020
Summary
Highway runoff contains soluble metals like iron, copper, and zinc. Storm characteristics, especially antecedent dry weather periods, significantly influence metal solubility and behavior in stormwater management.
Area of Science:
- Environmental Science
- Water Quality
- Urban Hydrology
Background:
- Highway runoff is a significant source of soluble metals.
- Stormwater management faces challenges in reducing dissolved metal pollution.
- Understanding metal behavior in runoff is crucial for effective treatment.
Purpose of the Study:
- To analyze iron, copper, and zinc in UK motorway runoff.
- To compare highway runoff metals with other urban sources.
- To investigate the influence of storm characteristics and de-icing agents on metal solubility.
Main Methods:
- Event monitoring of highway runoff at a UK motorway junction.
- Analysis of metal concentrations and solubility.
- Comparison with data from a local brook and sewage treatment works.
- Assessment of antecedent dry weather period (ADWP) effects.
Main Results:
- Metal concentrations and solubility proportions did not change immediately post-storm.
- Storm characteristics, particularly ADWP, strongly influenced metal concentrations.
- Road de-icing (sodium release) affected zinc availability.
Conclusions:
- Pre- and post-storm conditions are critical for analyzing metal solubility.
- Highway runoff metal behavior is influenced by storm dynamics and road maintenance practices.
- Further research is needed to optimize stormwater management for metal reduction.
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