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CA LCON <br /> SYSTEMS <br /> Superior Tank Wash, No Discharge System <br /> (This is a confidential document. Do not distribute) <br /> OVERVIEW <br /> None of the materials in the adhesives contain any halogenated hydrocarbons, heavy metals or <br /> pesticides. <br /> Process chemicals have GRAS (generally recognized as safe) rating: iron sulfate, hydrogen peroxide, and <br /> potassium carbonate. <br /> TRUCK TANK WASHING PROCEEDURE <br /> Step 1. Drain residual adhesive, 2 to 5 gallons,add iron and hydrogen peroxide to convert it to solids. <br /> The amount of water is so little that simple evaporation will yield moist solids. <br /> Step 2. Pressure wash truck with 5 to 10 gallons of water, add iron and hydrogen peroxide.Solids will <br /> settle to the bottom and decanted liquid is transferred to the cyclone tank for water treatment. <br /> Step 3. Pressure wash truck for 10 minutes with recycled clean water to rinse out remaining green <br /> adhesive (about 50 gallons). <br /> Step 4. Gama jet tank with a trace amount of iron (50 mis iron sulfate) and 500 mis of 35% hydrogen <br /> peroxide.This oxidizes the adhesive.This is done in a closed loop fashion;the solids are filtered out. <br /> Step 5. Pressure wash truck for 10 minutes with clean recycled water(about 50 gallons). <br /> WASTE WATER TREATMENT <br /> The wastewater from steps 2,3, and 5 equals about 110 gallons per truck.At 3 trucks per day this 1650 <br /> gallons of waste water per week.This water is treated with iron and hydrogen peroxide to produce a pH <br /> of S to 6, hydrogen peroxide concentration of about 500 ppm.The remaining solids settle to the bottom <br /> of tank 1.The clear water is transferred to tank 2 and the pH is adjusted to 6 with potassium carbonate. <br /> The solids in T2 are filtered out with a filter press.These solids are combined with the solids generated <br /> in step 1. The water in T2 has a TDS of about 100 ppm.This is concentrated with membranes to produce <br /> a salt content of about 50,000 TDS or about 3 gallons of salt water per week.The volume is so low its <br /> allowed to air dry to solid salt.The filtered water TDS is 1 to 10 PPM TDS.This recycled water is used for <br /> steps 1,2,3 and 5 <br /> SUMMARY <br /> In short,the waste water volume is essentially zero.The only water leaving the site is by evaporation or <br /> moisture in the solids. <br /> Truck wash steps 031221 <br /> 12919 Alcosta Blvd.Ste.9 San Ramon,CA 94583(925)277-0665 fax(925)277-9647 <br /> www.calcon.com <br />