This project follows a four-step approach, covering sources,
pathways and concentrations, environmental risks and treatment systems in each step.
- The first step entails an extensive literature review of sources,
concentrations and loadings of organic micropollutants and microplastics
in road run-off. This includes quantifying emission factors of organic
micropollutants and microplastics from various road and traffic related sources.
- In the second step, these insights are used to develop predicted environmental
concentrations (PEC) and predicted no-effect concentrations (PNEC) of a selection
of substances in several road border types.
- In the third step, the environmental risks of the particles are assessed by
comparing the observed concentrations with the PNEC values.
Also a probabilistic risk assessment is performed in this step to quantify
the probability that a species is exposed above its PNEC.
- In the last step, the existing treatment systems of contaminated water
streams are compared on their effectiveness in reducing environmental risks.
Combined with information from the environmental risk assessment,
this will provide an advice of when and how contaminated runoffs should
be treated in several scenarios.