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Advanced Interconnect Technologies <br />Source Reduction Plan <br />Page 4 <br />4.2. Aqueous hazardous waste generated at AIT is presented in the flow <br />diagram contained in Figure 2. <br />4.2.1. Pretreatment tanks (Degreaser, AI Etch, >12.5 Rinse Tank, and <br />Deoxidizer) — Disposal of the hazardous waste contained in these <br />tanks is pH adjusted with Caustic or Sulfuric acid prior to disposal <br />via a POTW permit. <br />4.2.2. Anodizing Tanks - Aqueous hazardous waste from the anodizing <br />tanks is first adjusted from a pH of — 1.8 to — 4.5, transferred to <br />the settling tank, and then treated with metal trapping polymers <br />which precipitate into a concentrated metal (Lead) sludge. The <br />decant aqueous waste is tested for lead concentration, passed <br />through a bag filter to remove large particulates, returned to the <br />equalization tank for final pH adjustment between 6-10, and <br />disposed via a POTW permit. Once fully contaminated, the bag <br />filters are placed into 55 gallon metal drums for off-site disposal. <br />The lead sludge is removed from the system via a filter press and <br />disposed off-site in 55 gallon metal drums. Any post filter press <br />residual aqueous waste is returned to the settling tank for <br />retreatment. <br />FIGURE 2. Aqueous Hazardous Waste Flow Diagram <br />