Forging

Of the approximately 15 aluminum forging plants, three use wet scrubbers to control particulates and smoke generated from the partial combustion of oil-based lubricants in the forging process.

TABLE 5.3

Summary of Wastewater Flows Reported for Aluminum Forming Industry Processes

Wastewater Flows

TABLE 5.3

Summary of Wastewater Flows Reported for Aluminum Forming Industry Processes

Wastewater Flows

Number of

Number with

Minimum

Mean

Median

Maximum

Operation

Plants

Zero Discharges

(cu m/Mg)a

(gal/ton)

(cu m/Mg)

(gal/ton)

(cu m/Mg)

(gal/ton)

(cu m/Mg)

(gal/ton)

I

Direct chill cooling (no recycle)

16

0

0.0003

0.08

7.9

1900

0.96

230

92

22,000

»

Direct chill cooling (recycle)

24

6

0.0003

0.08

0.96

230

0.43

104

5.8

1400

Q. O"

Continuous rod casting cooling

1

0

1.0

250

O O

Continuous sheet casting

4

2

0.001

0.24

0.0009

0.22

0.0005

0.12

0.003

0.64

0

Rolling with emulsions

20

0

0.0003

0.08

0.035

8.4

0.005

1.2

0.3

73

>

Extrusion die cleaning

»

Caustic bath

11

0

0.0002

0.06

0.014

3.3

0.008

1.9

0.054

13

Rinse

5

0

0.001

0.31

0.018

4.4

0.012

2.8

0.054

13

CD Q_

Extrusion dummy block cooling

2

0

2.1

500

2.1

510

2.2

520

Drawing with emulsions or soaps

6

1

0.003

0.81

1700

400,000

0.67

160

10,000

2,400,000

Q. c

Heat treatment quench

52

9

0.021

5

5.8

1400

2.3

560

32

7700

C/l

Annealing furnace, air pollution

1

0

0.026

6.3

control

»

Cleaning and etch line, rinse

20

0

0.001

0.34

22

5300

5.0

1200

150

36,000

Q. x

Cleaning and etch line, air

3

0

0.54

130

2.0

490

1.0

240

4.6

1100

» N

pollution control

» o

Saw oil lubricants

6

1

0.0004

0.10

0.0018

0.42

0.001

0.25

0.006

1.5

O c

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, available at http://www.access.gpo.gov/nara/cfr/waisidx_03/40cfr467_03.html, 2008. "

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, available at http://www.access.gpo.gov/nara/cfr/waisidx_03/40cfr467_03.html, 2008. "

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