What is an Interceptor?

A two-stage interceptor, also known as a separator, is a filter system which separates common oils and contaminants from wastewater before it enters the main sewage system. The pollutants are then stored in the interceptor to be removed and disposed of appropriately.

Wastewater enters into the first chamber of the interceptor through an inlet. It passes into the next chamber through a dip pipe, the opening of which is towards the base of the chamber. This minimises the risk of oils or petrol passing through to the next chamber, as they naturally rise to the top of the water. Any solid sediments will sink to the bottom of each chamber over time.

Interceptor & Septictank

Where are Interceptors needed?

Interceptors are used especially in areas subject to high levels of vehicle or machinery use, such as:

  • car parks
  • goods vehicle parks
  • vehicle maintenance areas
  • roads
  • industrial sites where oil is stored or used
  • refuelling facilities

How often do Interceptors need to be emptied out?

Interceptors need to be inspected by qualified personnel every six months and emptied every five years or so.

Regular checks should include the integrity of the interceptor, the amount of oil and silt accumulated, linked alarms and management systems and any coalescing devices; with a more detailed assessment when the interceptor is fully emptied.

Un-separated surface water can damage the environment, pollute rivers, streams and groundwater. Allowing it to happen because of a faulty or poorly-maintained interceptor can lead to prosecution by the Environment Agency.

Service Agreements

UKDN Waterflow offers service agreements for interceptor cleaning and emptying. Call us now for a quote on 0333 344 2937.