FLUID TREATMENT PLANT

Disclosed is a fluid treatment plant (1), comprising a plant inlet (10) for incoming fluid for treatment; a first portion (20) for fluid purification treatment; a second portion (30) for separation of waste from purified fluid generated by said purification treatment; and a plant outlet (40) for purified fluid. The first portion (20) comprises at least three containers, a first, a second and a third container (210, 220, 230) each having a bottom wall (214, 224, 234), a top (212, 222, 232) and enclosing side walls, and the second portion (30) comprises at least one filtration device (31). According to the invention, the first, second and third containers (210, 220, 230) are in fluid connection and arranged in series; the side walls of each of the first, second and third container (210, 220, 230) form a hexagonal or an octagonal cross section; and each of said first, second and third container (210, 220, 230) has an agitator (215, 225, 235) arranged therein.