Wis. Admin. Code Department of Natural Resources § NR 274.252 - Effluent limitations representing the degree of effluent reduction attainable by the 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 application of BPT:

Table 25-1

Primary Precious Metals and Mercury Smelter Wet Air Pollution Control

BPT Effluent Limitations

Maximum for any 1 day

Maximum for monthly average

Pollutant or pollutant property

mg/troy ounce of gold and silver smelted

Lead

0.546

0.260

Mercury

0.325

0.130

Silver

0.533

0.221

Zinc

1.898

0.793

Gold

0.130

Oil and grease

26.000

15.600

Total suspended solids

53.300

25.350

pH

(1)

(1)

(1) Within the range of 7.5 to 10.0 at all times

Table 25-2

Primary Precious Metals and Mercury Silver Chloride Reduction Spent Solution

BPT Effluent Limitations

Maximum for any 1 day

Maximum for monthly average

Pollutant or pollutant property

mg/troy ounce of silver reduced in solution

Lead

0.168

0.080

Mercury

0.100

0.040

Silver

0.164

0.068

Zinc

0.584

0.244

Gold

0.040

Oil and grease

8.000

4.800

Total suspended solids

16.400

7.800

pH

(1)

(1)

(1) Within the range of 7.5 to 10.0 at all times

Table 25-3

Primary Precious Metals and Mercury Electrolytic Cells Wet Air Pollution Control

BPT Effluent Limitations

Maximum for any 1 day

Maximum for monthly average

Pollutant or pollutant property

mg/troy ounce of gold refined electrolytically

Lead

83.160

39.600

Mercury

49.500

19.800

Silver

81.180

33.660

Zinc

289.100

120.800

Gold

19.800

Oil and grease

3,960.000

2,376.000

Total suspended solids

8,118.000

3,861.000

pH

(1)

(1)

(1) Within the range of 7.5 to 10.0 at all times

Table 25-4

Primary Precious Metals and Mercury Electrolyte Preparation Wet Air Pollution Control

BPT Effluent Limitations

Maximum for any 1 day

Maximum for monthly average

Pollutant or pollutant property

mg/troy ounce of silver in the produced electrolyte

Lead

0.021

0.010

Mercury

0.013

0.005

Silver

0.021

0.009

Zinc

0.073

0.031

Gold

0.005

Oil and grease

1.000

0.600

Total suspended solids

2.050

0.975

pH

(1)

(1)

(1) Within the range of 7.5 to 10.0 at all times.

Table 25-5

Primary Precious Metals and Mercury Calciner Wet Air Pollution Control

BPT Effluent Limitations

Maximum for any 1 day

Maximum for monthly average

Pollutant or pollutant property

mg/kg (pounds per million pounds) of mercury condensed

Lead

78.200

37.240

Mercury

46.550

18.620

Silver

76.340

31.650

Zinc

271.900

113.600

Gold

18.600

Oil and grease

3,724.000

2,234.000

Total suspended solids

7,634.000

3,631.000

pH

(1)

(1)

(1) Within the range of 7.5 to 10.0 at all times.

Table 25-6

Primary Precious Metals and Mercury Calcine Quench Water

BPT Effluent Limitations

Maximum for any 1 day

Maximum for monthly average

Pollutant or pollutant property

mg/kg (pounds per million pounds) of mercury condensed

Lead

7.392

3.520

Mercury

4.400

1.760

Silver

7.216

2.992

Zinc

25.700

10.740

Gold

1.760

Oil and grease

352.000

211.200

Total suspended solids

721.600

343.200

pH

(1)

(1)

(1) Within the range of 7.5 to 10.0 at all times.

Table 25-7

Primary Precious Metals and Mercury Calciner Stack Gas Contact Cooling Water

BPT Effluent Limitations

Maximum for any 1 day

Maximum for monthly average

Pollutant or pollutant property

mg/kg (pounds per million pounds) of mercury condensed

Lead

1.743

0.830

Mercury

1.038

0.415

Silver

1.702

0.706

Zinc

6.059

2.532

Gold

0.415

Oil and grease

83.000

49.800

Total suspended solids

170.200

80.930

pH

(1)

(1)

(1) Within the range of 7.5 to 10.0 at all times.

Table 25-8

Primary Precious Metals and Mercury Condenser Blowdown

BPT Effluent Limitations

Maximum for any 1 day

Maximum for monthly average

Pollutant or pollutant property

mg/kg (pounds per million pounds) of mercury condensed

Lead

5.796

2.760

Mercury

3.450

1.380

Silver

5.658

2.346

Zinc

20.150

8.418

Gold

1.380

Oil and grease

276.000

165.600

Total suspended solids

565.800

269.100

pH

(1)

(1)

(1) Within the range of 7.5 to 10.0 at all times.

Table 25-9

Primary Precious Metals and Mercury Mercury Cleaning Bath Water

BPT Effluent Limitations

Maximum for any 1 day

Maximum for monthly average

Pollutant or pollutant property

mg/kg (pounds per million pounds) of mercury condensed

Lead

0.588

0.280

Mercury

0.350

0.140

Silver

0.574

0.238

Zinc

2.044

0.854

Gold

0.140

Oil and grease

28.000

16.800

Total suspended solids

57.400

27.300

pH

(1)

(1)

(1) Within the range of 7.5 to 10.0 at all times.

Notes

Wis. Admin. Code Department of Natural Resources § NR 274.252
Cr. Register, March, 1991, No. 423, eff. 4-1-91.

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