§ 421.142 Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.
Current through Aug 22, 2025 · Read all of Part 421
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 control technology currently available:
(a) Sodium Antimonate Autoclave Wastewater.
BPT Limitations for the Primary Antimony Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of antimony contained in sodium antimonate product | ||
| Antimony | 44.840 | 20.000 |
| Arsenic | 32.650 | 14.530 |
| Mercury | 3.906 | 1.562 |
| Total suspended solids | 640.600 | 304.700 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(b) Fouled anolyte.
BPT Limitations for the Primary Antimony Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of antimony metal produced by electrowinning | ||
| Antimony | 44.840 | 20.000 |
| Arsenic | 32.650 | 14.530 |
| Mercury | 3.906 | 1.562 |
| Total suspended solids | 640.600 | 304.700 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(c) Cathode Antimony Wash Water.
BPT Limitations for the Primary Antimony Subcategory
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/kg (pounds per million pounds) of antimony metal produced by electrowinning | ||
| Antimony | 89.680 | 40.000 |
| Arsenic | 65.310 | 29.060 |
| Mercury | 7.812 | 3.125 |
| Total suspended solids | 1,281.000 | 609.300 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.