Pollutant Removability

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.6-13

TABLE 5.16

Removal of Pollutants by Lime and Sodium Hydroxide Precipitations

TABLE 5.16

Pollutant

Raw Wastewater

Treated Effluent

Percent Removal

pH (pH units)

9.4

8.3

Aluminum (mg/L)

35

0.35

99

Copper (mg/L)

670

BDL

99a

Iron (mg/L)

150

0.55

>99

Manganese (mg/L)

210

0.12

>99

Nickel (mg/L)

6100

BDL

>99a

Selenium (mg/L)

29,000

BDL

>99a

Titanium (mg/L)

130

BDL

>99a

Zinc (mg/L)

17,000

27

>99

TSS (mg/L)

3600

12

>99

Source: U.S. EPA, Development Document for Effluent Limitations Guidelines and Standards for the Aluminum Forming Point Source Category, Vols. 1 & 2, U.S. EPA, Washington, DC, 1984; U.S. EPA, Aluminum Forming Point Source Category, 2008. BDL, below detection limit. a Approximate value.

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