Oil-Water Separators: Their Role in Infrastructure Drainage

Water collected from infrastructure can contain more than rainwater. In applications where oil or hydrocarbons may be present, separation can form an important part of the drainage strategy.

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Technical insight

Infrastructure environments such as roads, parking areas, industrial facilities and other operational sites can introduce different contaminants into surface water. Where required by the project design and applicable requirements, oil-water separation systems can help manage these contaminants before water continues through the drainage system.

Where does the requirement come from?

The need for separation depends on the application.

Areas where vehicles, machinery, fuels or oils are present may require different considerations from a conventional roof or landscape drainage system.

Understanding the source of the water is therefore an important part of determining the appropriate solution.

How does it fit into the Rain-to-Drain journey?

An oil-water separator is not the entire drainage system.

It is one component within a wider journey: Collection → Conveyance → Separation → Flow Management → Discharge.

The separator needs to be considered in relation to the upstream collection system and downstream drainage or discharge arrangements.

Selecting the appropriate system

Different projects have different requirements.

The appropriate system can depend on factors such as the application, expected water flow, site conditions and project specifications.

This is why product selection should follow an understanding of the project rather than simply selecting a standard product from a catalogue.

The importance of technical support

Specialist manufacturers provide the technology, but projects also need people who understand how that technology fits into the wider infrastructure.

DND works with specialist manufacturers and project stakeholders to support the identification and supply of solutions for water and drainage applications.

The objective is not simply to separate oil from water. It is to ensure the separation system forms part of a properly considered drainage solution.

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