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11 <br />e <br />FACILITY CONCEPT <br />The six heavy metals used by electroplating <br />board firms which are currently discharged intod Printed circuit <br />are now subject to pretreatment standards are copper,chromium, <br />and <br />nickel, cadmium, zinc and lead. P , chromium, <br />cyanide, which is also These metals along with <br />will be treated at the FacilityIn some of these waste waters, <br />comply with discharge regulations that participating firms can <br />A preliminary Facility <br />proposal submitted by RCntopthe aMWCCenas well as tas h <br />conceptual feasibility work done for the Metropolitan <br />the <br />of a <br />Councils' Resource Recover politan <br />components of the Facility'�sTseop�omae' While certain <br />Pilot scale testing and Y change as a result of <br />components described in preliminary <br />incorporated into the Facility's final work, mayor <br />expected to be <br />design. <br />Explicit in the Facility's design is treatment and recovery. <br />The treatment technologies include those tche <br />the aqueous inorganic wastes received b Processes which render <br />amenable to recovery, less expensive toyhandle the aand/or more <br />hazardous to manage. The use of these treatmentprocesses <br />occur as in -plant modifications in the electroplating or <br />may <br />Printed circuit shops participating in the g <br />the Facility itself. The recovery systems,pon�the� other <br />done at <br />are those processes designed to extract raw materials(chrome, <br />hand, <br />nickel, zinc, etc.) from appropriately treated wastes. chrome, <br />shows theroveralllrelationshi of es. ,� <br />ow sheet is presented in Figure I. This <br />the Facility's various treatment technologieSgander stocks to <br />systems. The incoming feedstock includes ion exchange <br />canisters, metal -specific waste water solutions (batch and solids (metal -specific and mixed metal sludges). h dumps) <br />following individual treatment and recover The <br />be involved in the proposed Facility are describedinthatde are to <br />Io n detail. <br />n Exchange <br />The ion exchange process is a stoichiometric <br />whereby an ion from a solution is exchanged chemicalfora•reaction <br />charged ion that is attached to an immobile solid particle. <br />These particles make up a granular solid called anPio exchange <br />-resin. This process is utilized in the metals n exchange <br />Process to concentrate the metals present in therwasteawater <br />the plant so that transportation of the metals to the ter at <br />for recovery will be more . Ion a Facility <br />used to treat spent plating baths as an endOfexchange may also be <br />but its greatest value is in the recovery applicPipations. <br />A-z <br />r <br />1 <br />