Abstract: A tank interceptor for rain water and waste-water includes a container which has an intermediate partition dividing the chamber into a by-pass compartment above the partition and a treatment compartment below. An inlet is positioned adjacently above the partition and an outlet is also positioned adjacently above the partition, but spaced away from the inlet. The partition includes a raised portion isolating the inlet from the outlet, such that liquid entering through the inlet and seeking to reach the outlet through the by-pass compartment must overlow the raised portion in order to do so. Openings are provided through the partition on the inlet side and the outlet side of the raised portion, and communicate the by-pass compartment with the treatment compartment. The openings are such that liquid, without having to overflow the raised portion, can travel from the inlet to the outlet through the treatment compartment.

Abstract: A separator tank for rainwater and waste-water includes a container defining an upwardly open chamber, with a lid to close the chamber. An inlet is at a first location and an outlet is at a second location. A passageway forms part of the container and communicates the inlet with the outlet. A first opening is adjacent the inlet and communicates the passageway with the chamber, while a second opening is adjacent the outlet, also communicating the passageway with the chamber. The passageway itself is sealed from communication with the chamber, except for the openings. A weir is provided within the passageway, disposed with respect to the first opening such that, under relatively low entry flow rates, all entering materials are contained by the weir and flow through the first opening and into the chamber. Under relatively high entry flow rates, the entering materials overflow the weir and are delivered by the passageway to the outlet.