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A petrol interceptor is a trap used to filter out hydrocarbon pollutants from rainwater runoff. It is typically used in road construction and on Petrol Station forecourts to prevent fuel contamination of streams carrying away the runoff.

Petrol interceptors work on the premise that hydrocarbons such as petroleum and diesel float on the top of water. The contaminated water enters the interceptor typically after flowing off roads or forecourts and entering a channel drain before being deposited into the first tank inside the interceptor. The first tank builds up a layer of the hydrocarbon as well as other scum. Typically petrol interceptors have 3 separate tanks each connected with a dip pipe, as more liquid enters the interceptor the water enters into the second tank leaving the majority of the hydrocarbon behind as it cannot enter the dip pipe, who's opening into the second tank is below the surface. However some of the contaminants may by chance enter the second tank. This second tank will not build up as much of the hydrocarbon on its surface. As before, the water is pushed into the third tank and more water enters the second. The third tank should be practically clear of any hydrocarbon floating on its surface. As a precaution, the outlet pipe is also a dip pipe. When the water leaves the third tank via the outlet pipe it should be contaminant free.^[1]

Types of Petrol Interceptors

Full retention interceptor

A full retention petrol interceptor is an interceptor which treats the full flow a drainage system provides which is equivalent 50^[2] to 65mm/hour^[3] of rainfall.

^ Nash, W. G. (1991). Brickwork (Rev. 2nd ed. ed.). Cheltenham, U.K: Thornes. p. 134. ISBN 0748703101. Retrieved 27 May 2011. {{cite book}}: |edition= has extra text (help); More than one of |pages= and |page= specified (help)
^ "Full Retention Interceptors". INTERCEPTORS - OIL / PETROL. Aswaclear. Retrieved 14 April 2012.
^ Environment Agency (2006). "Use and design of oil separators in surface water drainage systems: PPG 3" (PDF). Pollution Prevention Guidelines. Environment Agency. p. 3. Retrieved 14 April 2012. {{cite web}}: More than one of |pages= and |page= specified (help); Unknown parameter |coauthors= ignored (|author= suggested) (help); Unknown parameter |month= ignored (help)