Aluminum forming industry waste treatment

Chapter 5 Waste Treatment in the Aluminum Forming Industry. 197... 

A study of an operational waste treatment facility that chemically reduces hexavalent chromium has shown mat 99.7% reduction efficiency is easily achieved (Appendix A2). Final concentrations of 0.05 mg/L are readily attained, and concentrations of 0.01 mg/L are considered to be attainable by properly maintained and operated equipment. Condnct a literature search, showing how chemical reduction, sedimentation, and/or filtration togemer can effectively treat the industrial effluents from me mdnstrial operations of metal finishing, aluminum forming, and inorganic chemicals mannfactnring. 

Water and Waste Water Treatment. PAG products are used in water treatment for removal of suspended soHds (turbidity) and other contaminants such as natural organic matter from surface waters. Microorganisms and colloidal particles of silt and clay are stabilized by surface electrostatic charges preventing the particles from coalescing. Historically, alum (aluminum sulfate hydrate) was used to neutralize these charges by surface adsorption of Al cations formed upon hydrolysis of the alum. Since 1983 PAG has been sold as an alum replacement in the treatment of natural water for U.S. municipal and industrial use. 

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