System and method for purifying rainfall runoff

摘要

A system for purifying rainfall runoff including a bar screen; a collection and diversion device; a filter channel; a grass ditch; and a water storage tank. The bar screen is disposed around the collection and diversion device for preliminarily filtering the road rainfall runoff. The collection and diversion device collects the road rainfall runoff and diverts early rainfall runoff to the filter channel, after the filter channel is full, later rainfall runoff is directly diverted to the grass ditch through open channels. The grass ditch includes a percolation bed capable of filtering the early and later rainfall runoff. The water storage tank is connected to the grass ditch via a guiding pipe, to receive the rainfall runoff effusing out of the grass ditch. Part of the rainfall runoff received by the water storage is transported to the percolation bed by a return conduit.

主权项

1. A system for purifying rainfall runoff comprising an early rainfall runoff and a later rainfall runoff, the system comprising:
a) a bar screen; b) a collection and diversion device comprising a first side, a second side and a third side; c) a filter channel; d) a grass ditch comprising a percolation bed; e) a water storage tank; f) a first diversion canal; g) a second diversion canal; and h) a return conduit; wherein:
the first side is disposed adjacent to the bar screen;the collection and diversion device is adapted to receive the rainfall runoff via the bar screen and the first side;the second side is substantially in parallel with the first side;the third side is substantially perpendicular to the first side and the second side;the second side is connected to the first diversion canal for directing the early rainfall runoff into the first diversion canal and then into the filter channel via the first diversion canal;the filter channel is connected between the first diversion canal and the grass ditch for filtering the early rainfall runoff into a filtered rainfall runoff and transporting the filtered rainfall runoff to the grass ditch;the third side is connected to the second diversion canal for diverting the later rainfall runoff to the second diversion canal after the filter channel is full;the second diversion canal is connected to the grass ditch for transporting the later rainfall runoff into the grass ditch;the water storage tank is connected to the grass ditch via a guiding pipe, to receive the rainfall runoff effusing out of the grass ditch; andthe return conduit is disposed between the water storage tank and the percolation bed.