Facility for treating an aqueous fluid by contact with a fluidised bed of coagulated activated carbon in powder form

摘要

The present invention relates to a treatment installation of aqueous fluid, in particular to ensure elimination of organic micropollutants and natural organic matter, comprising a single reactor (10) for treatment of aqueous fluid by contact with a fluidized bed of coagulated and flocculated powdered activated carbon, operating in ascending flow, said reactor being equipped with injection means of new powdered activated carbon, coagulant and polymer, arranged to define three distinct operating zones in the reactor:
a first arranged zone (A) at the base of the reactor to ensure intake and homogeneous distribution of the aqueous fluid pre-treated by contact with coagulant and polymer,a second zone, surmounting the first, constituted by the fluidized bed of coagulated and flocculated powdered activated carbon (B), anda third zone (C), arranged in the top part of the reactor for separation and recovery of the purified aqueous liquid.

主权项

1. A treatment installation for aqueous fluid comprising a single reactor (10) for treatment of aqueous fluid by contact with a fluidised bed of coagulated and flocculated powdered activated carbon, operating in ascending flow, said reactor being equipped with injection means of new powdered activated carbon, coagulant and polymer, said injection means being arranged so as to define in the reactor three distinct operating zones:
a first zone (A) arranged at the base of the reactor containing a lining of gravel and sand, wherein said first zone is substantially free of powdered activated carbon, to ensure intake and homogeneous distribution of the aqueous fluid pre-treated by contact with the coagulant and the polymer, a second zone, surmounting the first, constituted by the fluidised bed of coagulated and flocculated powdered activated carbon (B), and a third zone (C) surmounting the second zone and extending up to the top of the reactor which allows separation and recovery of the purified aqueous liquid fluid, wherein said installation comprises:
an aqueous supply circuit (20) connected to at least one dispersion ramp (12) disposed in said first zone;an intake ramp (16) opening in said second zone, said intake ramp being connected to coagulant and new powdered activated carbon injection means;a coagulant injection circuit connected to said aqueous supply circuit (20);polymer injection means connected to said aqueous supply circuit (20), downstream of said coagulant injection circuit, and/or a polymer injection ramp (22) opening in said second zone;a draw off channel (24) disposed in said third zone for channeling purified aqueous fluid;a waste powdered activated carbon extraction circuit (28) disposed in the lower part of said second zone.