Performance
Significant removal efficiencies, typically greater than 80% can be achieved (depending on site conditions) with a selection of sizes being available to cater for a broad range of design flows. Independent evaluation has confirmed that the system is able to meet the removal requirements for a Class II oil interceptor (a free oil concentration of less than 100 mg/l in the discharge), depending on flow rates. It requires only a fraction of the land area of lagoons and treatment ponds.

Sizing
The chart below shows the design flow rates at which typical removal efficiencies of greater than 80% are achievable for oil and sand. Under special circumstances, upsizing is recommended. The bulk of pollutant material tends to be included in the ‘first flush’ of the runoff during a storm event, as the flow rates build up, therefore with a correctly sized unit, the vast majority of solids and hydrocarbons can be removed and retained within the unit.

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