System for treating and discharging groundwater from a polluted site isolated from the environment by an impervious wall in the soil

摘要

A system is claimed for the treatment of polluted ground water which has been contained in an area (1), isolated from the surroundings by a water tight wall (2) beneath the surface. The treatment is carried out as the polluted water leaves the enclosed area and moves towards the surrounding environment. Water is collected in a drain (10) and passed through a number of treatment stages (22,24) before discharge (30). Each treatment stage is separated from its neighbour by walls (25-28) pierced by a single pipe at different heights, causing a serpentine flow.