40 C.F.R. § 421.122

Current through October 31, 2024
Section 421.122 - Effluent limitations guidelines 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 through 125.32 , any existing point source subject to this subpart shall achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable technology currently available:

(a) Subpart L-Film Stripping.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/troy ounce of silver from film stripping
Copper95.67050.350
Zinc73.51030.720
Ammonia (as N)6,712.0002,951.000
Total suspended solids2,065.000981.800
pH(1)(1)

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

(b) Subpart L-Film Stripping Wet Air Pollution Control and Precipitation and Filtration of Film Stripping Solutions Wet Air Pollution Control.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/troy ounce of silver from precipitation and filtration of film stripping solutions
Copper1.843.970
Zinc1.416.592
Ammonia (as N)129.30056.840
Total suspended solids39.77018.920
pH(1)(1)

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

(c) Subpart L-Precipitation and Filtration of Film Stripping Solutions.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/troy ounce of silver precipitated
Copper109.40057.570
Zinc84.05035.120
Ammonia (as N)7,674.0003,374.000
Total suspended solids2,361.0001,123.000
pH(1)(1)

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

(d) Subpart L-Precipitation and Filtration of Photographic Solutions.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/troy ounce of silver precipitated
Copper50.54026.600
Zinc38.83616.226
Ammonia (as N)3,545.0001,559.000
Total suspended solids1,090.600518.700
pH(1)(1)

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

(e) Subpart L-Precipitation and Filtration of Photographic Solutions Wet Air Pollution Control.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/troy ounce of silver from precipitation and filtration of photographic solutions
Copper23.07012.140
Zinc17.7307.406
Ammonia (as N)1,618.000711.400
Total suspended solids497.800236.800
pH(1)(1)

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

(f) Subpart L-Electrolytic Refining.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/troy ounce of silver from electrolytic refining
Copper1.444.760
Zinc1.110.464
Ammonia (as N)101.30044.540
Total suspended solids31.16014.820
pH(1)(1)

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

(g) Subpart L-Furnace Wet Air Pollution Control.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/troy ounce of silver roasted, smelted, or dried
Copper1.273.670
Zinc.978.409
Ammonia (as N)89.31039.260
Total suspended solids27.47013.070
pH(1)(1)

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

(h) Subpart L-Leaching.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/troy ounce of silver produced from leaching
Copper.164.086
Zinc.126.053
Ammonia (as N)11.4705.040
Total suspended solids3.5261.677
pH(1)(1)

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

(i) Subpart L-Leaching Wet Air Pollution Control and Precipitation of Nonphotographic Solutions Wet Air Pollution Control.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/troy ounce of silver produced from leaching or silver precipitated
Copper8.4174.430
Zinc6.4682.703
Ammonia (as N)590.500259.600
Total suspended solids181.70086.390
pH(1)(1)

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

(j) Subpart L-Precipitation and Filtration of Nonphotographic Solutions.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/troy ounce of silver precipitated
Copper5.8333.070
Zinc4.4821.873
Ammonia (as N)409.300179.900
Total suspended solids125.90059.870
pH(1)(1)

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

(k) Subpart L-Floor and Equipment Washdown.

BPT Effluent Limitations

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/troy ounce of silver production
Copper.000.000
Zinc.000.000
Ammonia (as N).000.000
Total suspended solids.000.000
pH(1)(1)

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

40 C.F.R. §421.122

49 FR 8821, Mar. 8, 1984, as amended at 49 FR 29795, July 24, 1984