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A treatment-train approach to stormwater management involves a range of measures (primary, secondary, and tertiary) that work together to enhance water quality.
Clean, treated water flows back to the environment
The aim is to remove gross pollutants and coarse sediment (>5mm in size) and help in the downstream treatment of smaller pollutants.
Tertiary treatment is the final cleaning process that improves wastewater quality before it is reused, recycled or discharged to the environment.
The treatment removes remaining inorganic compounds, and substances, such as the nitrogen and phosphorus.
Bacteria, viruses and parasites, which are harmful to public health, are also removed at this stage.