Wis. Admin. Code Department of Natural Resources § NR 257.32 - Effluent limitations representing the degree of effluent reduction attainable by application of the best practicable control technology currently available

Current through March 28, 2022

Except as provided in 40 CFR 125.30 to 125.32, any existing point source subject to this subchapter shall achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of BPT:

Table 66

Core operation BPT

Pollutant or pollutant property

Maximum for any 1 day

Maximum for monthly average

mg/off-kg (lb/million off-lbs) of aluminum extruded

Chromium

0.16

0.066

Cyanide

0.11

0.044

Zinc

0.53

0.22

Aluminum

2.34

1.16

Oil and grease

7.32

4.39

Suspended solids

15.00

7.13

pH

(1)

(1)

1 Within the range of 7.0 to 10 at all times.

Table 67

Extrusion press leakage BPT

Pollutant or pollutant property

Maximum for any 1 day

Maximum for monthly average

mg/off-kg (lb/million off-lbs) of aluminum extruded

Chromium

0.65

0.27

Cyanide

0.43

0.18

Zinc

2.16

0.90

Aluminum

9.51

4.73

Oil and grease

29.56

17.74

Suspended solids

60.60

28.82

pH

(1)

(1)

1 Within the range of 7.0 to 10 at all times.

Table 68

Direct chill casting contact cooling water BPT

Pollutant or pollutant property

Maximum for any 1 day

Maximum for monthly average

mg/off-kg (lb/million off-lbs) of aluminum cast

Chromium

0.59

0.24

Cyanide

0.39

0.16

Zinc

1.94

0.81

Aluminum

8.55

4.26

Oil and grease

26.58

15.95

Suspended solids

54.49

25.92

pH

(1)

(1)

1 The pH shall be maintained within the range of 7.0 to 10.0 at all times, except for those situations when this waste stream is discharged separately and without commingling with any other wastewater, in which case the pH shall be within the range of 6.0 to 10.0 at all times.

Table 69

Press heat treatment contact cooling water BPT

Pollutant or pollutant property

Maximum for any 1 day

Maximum for monthly average

mg/off-kg (lb/million off-lbs) of aluminum quenched

Chromium

3.39

1.39

Cyanide

2.24

0.93

Zinc

11.25

4.70

Aluminum

49.55

24.66

Oil and grease

154.10

92.46

Suspended solids

315.91

150.25

pH

(1)

(1)

1 Within the range of 7.0 to 10 at all times.

Table 70

Solution heat treatment contact cooling water BPT

Pollutant or pollutant property

Maximum for any 1 day

Maximum for monthly average

mg/off-kg (lb/million off-lbs) of aluminum quenched

Chromium

3.39

1.39

Cyanide

2.24

0.93

Zinc

11.25

4.70

Aluminum

49.55

24.66

Oil and grease

154.10

92.46

Suspended solids

315.91

150.25

pH

(1)

(1)

1 Within the range of 7.0 to 10 at all times.

Table 71

Cleaning or etching bath BPT

Pollutant or pollutant property

Maximum for any 1 day

Maximum for monthly average

mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched

Chromium

0.079

0.032

Cyanide

0.052

0.022

Zinc

0.26

0.109

Aluminum

1.15

0.573

Oil and grease

3.58

2.15

Suspended solids

7.34

3.49

pH

(1)

(1)

1 Within the range of 7.0 to 10 at all times.

Table 72

Cleaning or etching rinse and hot water seal BPT

Pollutant or pollutant property

Maximum for any 1 day

Maximum for monthly average

mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched

Chromium

6.12

2.51

Cyanide

4.04

1.67

Zinc

20.31

8.49

Aluminum

89.46

44.52

Oil and grease

278.24

166.95

Suspended solids

570.39

271.29

pH

(1)

(1)

1 Within the range of 7.0 to 10 at all times.

Table 73

Cleaning or etching scrubber liquor BPT

Pollutant or pollutant property

Maximum for any 1 day

Maximum for monthly average

mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched

Chromium

7.00

2.86

Cyanide

4.61

1.91

Zinc

23.22

9.70

Aluminum

102.24

50.88

Oil and grease

318.00

190.80

Suspended solids

651.90

310.05

pH

(1)

(1)

1 Within the range of 7.0 to 10 at all times.

Table 74

Degassing scrubber liquor BPT

Pollutant or pollutant property

Maximum for any 1 day

Maximum for monthly average

mg/off-kg (lb/million off-lbs) of aluminum degassed

Chromium

1.15

0.47

Cyanide

0.76

0.32

Zinc

3.81

1.59

Aluminum

16.78

8.35

Oil and grease

52.18

31.31

Suspended solids

106.97

50.88

pH

(1)

(1)

1 Within the range of 7.0 to 10 at all times.

Notes

Wis. Admin. Code Department of Natural Resources § NR 257.32
Cr. Register, November, 1989, No. 407, eff. 12-1-89.

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