Wis. Admin. Code Department of Natural Resources NR 274.252

Current through November 25, 2024

Section NR 274.252 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available

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.

Wis. Admin. Code Department of Natural Resources NR 274.252

Cr. Register, March, 1991, No. 423, eff. 4-1-91.