§ 421.122 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

§ 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
Copper	95.670	50.350
Zinc	73.510	30.720
Ammonia (as N)	6,712.000	2,951.000
Total suspended solids	2,065.000	981.800
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
Copper	1.843	.970
Zinc	1.416	.592
Ammonia (as N)	129.300	56.840
Total suspended solids	39.770	18.920
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
Copper	109.400	57.570
Zinc	84.050	35.120
Ammonia (as N)	7,674.000	3,374.000
Total suspended solids	2,361.000	1,123.000
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
Copper	50.540	26.600
Zinc	38.836	16.226
Ammonia (as N)	3,545.000	1,559.000
Total suspended solids	1,090.600	518.700
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
Copper	23.070	12.140
Zinc	17.730	7.406
Ammonia (as N)	1,618.000	711.400
Total suspended solids	497.800	236.800
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
Copper	1.444	.760
Zinc	1.110	.464
Ammonia (as N)	101.300	44.540
Total suspended solids	31.160	14.820
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
Copper	1.273	.670
Zinc	.978	.409
Ammonia (as N)	89.310	39.260
Total suspended solids	27.470	13.070
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)	11.470	5.040
Total suspended solids	3.526	1.677
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
Copper	8.417	4.430
Zinc	6.468	2.703
Ammonia (as N)	590.500	259.600
Total suspended solids	181.700	86.390
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
Copper	5.833	3.070
Zinc	4.482	1.873
Ammonia (as N)	409.300	179.900
Total suspended solids	125.900	59.870
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.

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