TABLE 510 continued


Metals and inorganics Copper Nickel

Classical Pollutants (mg/L) Oil and grease Suspended solids pH

Aluminum Calcium Magnesium COD

Dissolved solids


Phenols, total

Toxic Pollutants (pg/L) Toxic organics

Methylene chloride Metals and inorganics Chromium Nickel

Number of Samples/ Number of Detections

Range of Detections

BDL-100 BDL-<17

Wastestream: Extrusion Solution

41 <2-2 7.3-7.3 <0.5-0.54 38-58 5.3-25 7-20 160-580 7-120 1.8-2.7 0.001-0.01


18-5100 BDL-18

Median of Detections

36 BDL

Mean of Detections


2600 10

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.

heat treatment quenching processes are presented in Tables 5.9 and 5.10 by the aluminum forming operation that it follows.

5.3.7 Etch or Cleaning

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.

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