There are a variety of separators & interceptors available. These are:
Full Retention Separators
Full retention separators can be used in car parks, roadways, fuel distribution depots, vehicle workshops and forecourts. Full retention separators treat the full flow that can be delivered by the drainage system. This is normally equivalent to the flow generated by a rainfall intensity of 65mm/hr. Full retention separators are used in high risk spillage areas such as fuel distribution depots, vehicle workshops or scrap yards.
Bypass separators are used when it is considered an acceptable risk not to provide full treatment, for very high flows, and are used, for example, where the risk of a large spillage and heavy rainfall occurring at the same time is small, e.g. surface car parks, roadways and lightly contaminated commercial areas. Bypass separators fully treat all flows generated by rainfall rates of up to 6.5mm/hr. This covers over 99% of all rainfall events. Flows above this rate are allowed to bypass the separator. Separators are designed and tested to EN 858-1. All models are robust, lightweight and easy to install.
Forecourt separators are full retention separators specified to retain on site the maximum spillage likely to occur on a petrol filling station. They are required for both safety and environmental reasons and will treat spillages occurring during vehicle refuelling and road tanker delivery. The size of the separator is increased in order to retain the possible loss of the contents of one compartment of a road tanker, which may be up to 7,600 litres. Separators are designed and tested to EN 858-1. All models are robust, lightweight and easy to install.
Washdown and silt traps can be used in areas such as car wash and other cleaning facilities that discharge directly into a foul drain, which feeds into a municipal treatment facility.