A system for treating an effluent gas of at least one aluminum production electrolytic cell, comprising: one or more aluminum electrolytic cells ; an effluent gas treatment system dedicated to and arranged at a level vertically above that of the one or more aluminum electrolytic cells , a housing defining an interior area of the dedicated effluent gas treatment system and including an at least partially porous bottom , a flow control device for supplying absorbent from an absorbent supply to an adsorbent hopper within the interior area , the flow control device arranged vertically within the interior area and comprising an elongated hollow first portion and a tapered second portion arranged a predetermined distance (D) from the at least partially porous bottom of the housing , wherein the flow control device is adjustable in position relative to the adsorbent hopper and the at least partially porous bottom to enable control of the supply of absorbent to the adsorbent hopper , the adsorbent hopper defined between a wall of the housing and a retaining wall which extends vertically and has a free overflow edge , the adsorbent hopper extending across the at least partially porous bottom of the housing between the flow control device and a dry scrubber contact reactor , the dry scrubber contact reactor arranged downstream of the adsorbent hopper in the flow direction of the adsorbent and having an effluent gas inlet defined by a wall of the housing and the free overflow edge of the retaining wall of the adsorbent hopper , a feeding pipe fluidly connected between the adsorbent hopper and the one or more aluminum electrolytic cells for supplying adsorbent (A) to the one or more aluminum electrolytic cells , and an effluent gas outlet in a cell housing for the one or more aluminum electrolytic cells , fluidly connected to the dry scrubber contact reactor for interaction of the effluent gas (EG) with adsorbent (A) supplied from the adsorbent hopper to produce contacted gas (CG). one or more aluminum electrolytic cells ; an effluent gas treatment system dedicated to and arranged at a level vertically above that of the one or more aluminum electrolytic cells , a housing defining an interior area of the dedicated effluent gas treatment system and including an at least partially porous bottom , a flow control device for supplying absorbent from an absorbent supply to an adsorbent hopper within the interior area , the flow control device arranged vertically within the interior area and comprising an elongated hollow first portion and a tapered second portion arranged a predetermined distance (D) from the at least partially porous bottom of the housing , wherein the flow control device is adjustable in position relative to the adsorbent hopper and the at least partially porous bottom to enable control of the supply of absorbent to the adsorbent hopper , the adsorbent hopper defined between a wall of the housing and a retaining wall which extends vertically and has a free overflow edge , the adsorbent hopper extending across the at least partially porous bottom of the housing between the flow control device and a dry scrubber contact reactor , the dry scrubber contact reactor arranged downstream of the adsorbent hopper in the flow direction of the adsorbent and having an effluent gas inlet defined by a wall of the housing and the free overflow edge of the retaining wall of the adsorbent hopper , a feeding pipe fluidly connected between the adsorbent hopper and the one or more aluminum electrolytic cells for supplying adsorbent (A) to the one or more aluminum electrolytic cells , and an effluent gas outlet in a cell housing for the one or more aluminum electrolytic cells , fluidly connected to the dry scrubber contact reactor for interaction of the effluent gas (EG) with adsorbent (A) supplied from the adsorbent hopper to produce contacted gas (CG). <EOS>