Aluminum wastewater pollutants

Concentrations of Toxic Pollutants Found in Primary Aluminum Wastewater... 

This section describes the treatment techniques currently used or available to remove or recover wastewater pollutants normally generated by aluminum forming facilities. In general, these pollutants are removed by oil removal (skimming, emulsion breaking, and flotation), chemical precipitation and sedimentation, or filtration.6- 3... 

Classical Pollutants in the Raw Wastewater of the Primary Aluminum Subcategory... 

Removability of Toxic Organic Pollutants from Wastewater in the Secondary Aluminum Subcategory... 

Thirty plants in the aluminum forming industry use etch or cleaning lines. Rinsing is usually required following successive chemical treatments within these etch or cleaning lines. Wastewater discharge values tend to increase as the number of rinses increase. Table 5.11 summarizes the classical and toxic pollutant data for etch line rinses. 

Toxic and Classical Pollutants in Raw Wastewater of the Aluminum Subcategory, Verification Data... 

Some innovating treatment technologies may be introduced in the treatment of wastewater generated in the aluminum fluoride industry to make its effluent safer. The ion exchange process can be applied to the clarified solution to remove copper and chromium. At a very low concentration, these two pollutants can be removed by xanthate precipitation.24 A combination of lime and ferric sulfate coagulation will effectively reduce arsenic concentration in the wastewater. 

The model that is going to be explained in this section was proposed by the group of Lapicque in 2006 (Khemis et al. 2006) to describe the electrochemical coagulation of organic polluted wastewaters with aluminum, and it is based on the same assumptions that a previously proposed model used to describe the oil-water emulsion breaking process (Carmona et al. 2006). 

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