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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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