Title 40
SECTION 471.81
471.81 Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).
§ 471.81 Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT).Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations for the process operations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT):
(a) Rolling spent neat oils - subpart H - BPT. There shall be no discharge of process wastewater pollutants.
(b) Rolling spent emulsions.
Subpart H - BPT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of zinc rolled with emulsions | ||
| Chromium | 0.0006 | 0.0003 |
| Copper | 0.003 | 0.002 |
| Cyanide | 0.0004 | 0.0002 |
| Zinc | 0.002 | 0.0009 |
| Oil and grease | 0.028 | 0.017 |
| TSS | 0.057 | 0.027 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(c) Rolling contact cooling water.
Subpart H - BPT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of zinc rolled with contact cooling water | ||
| Chromium | 0.236 | 0.0097 |
| Copper | 1.02 | 0.536 |
| Cyanide | 0.156 | 0.065 |
| Zinc | 0.783 | 0.327 |
| Oil and grease | 10.7 | 6.43 |
| TSS | 22.0 | 10.5 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(d) Drawing spent emulsions.
Subpart H - BPT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of zinc drawn with emulsions | ||
| Chromium | 0.003 | 0.001 |
| Copper | 0.011 | 0.006 |
| Cyanide | 0.002 | 0.0007 |
| Zinc | 0.009 | 0.004 |
| Oil and grease | 0.116 | 0.070 |
| TSS | 0.238 | 0.113 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(e) Direct chill casting contact cooling water.
Subpart H - BPT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of zinc cast by the direct chill method | ||
| Chromium | 0.222 | 0.091 |
| Copper | 0.960 | 0.505 |
| Cyanide | 0.147 | 0.061 |
| Zinc | 0.738 | 0.308 |
| Oil and grease | 10.1 | 6.06 |
| TSS | 20.7 | 9.85 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(f) Stationary casting contact cooling water - subpart H - BPT. There shall be no discharge of process wastewater pollutants.
(g) Heat treatment contact cooling water.
Subpart H - BPT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of zinc heat treated | ||
| Chromium | 0.336 | 0.138 |
| Copper | 1.45 | 0.763 |
| Cyanide | 0.221 | 0.092 |
| Zinc | 1.12 | 0.466 |
| Oil and grease | 15.3 | 9.16 |
| TSS | 31.3 | 14.9 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(h) Surface treatment spent baths.
Subpart H - BPT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of zinc surface treated | ||
| Chromium | 0.039 | 0.016 |
| Copper | 0.169 | 0.089 |
| Cyanide | 0.026 | 0.011 |
| Zinc | 0.130 | 0.054 |
| Oil and grease | 1.78 | 1.07 |
| TSS | 3.64 | 1.73 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(i) Surface treatment rinse.
Subpart H - BPT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of zinc surface treated | ||
| Chromium | 1.58 | 0.645 |
| Copper | 6.80 | 3.58 |
| Cyanide | 1.04 | 0.430 |
| Zinc | 5.23 | 2.19 |
| Oil and grease | 71.6 | 43.0 |
| TSS | 147 | 69.8 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(j) Alkaline cleaning spent baths.
Subpart H - BPT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of zinc alkaline cleaned | ||
| Chromium | 0.002 | 0.0007 |
| Copper | 0.007 | 0.004 |
| Cyanide | 0.001 | 0.0004 |
| Zinc | 0.005 | 0.002 |
| Oil and grease | 0.071 | 0.043 |
| TSS | 0.146 | 0.069 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(k) Alkaline cleaning rinse.
Subpart H - BPT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of zinc alkaline cleaned | ||
| Chromium | 0.744 | 0.304 |
| Copper | 3.21 | 1.69 |
| Cyanide | 0.490 | 0.203 |
| Zinc | 2.47 | 1.03 |
| Oil and grease | 33.8 | 20.3 |
| TSS | 69.3 | 33.0 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(l) Sawing or grinding spent emulsions.
Subpart H - BPT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of zinc sawed or ground with emulsions | ||
| Chromium | 0.011 | 0.005 |
| Copper | 0.045 | 0.024 |
| Cyanide | 0.007 | 0.003 |
| Zinc | 0.035 | 0.015 |
| Oil and grease | 0.476 | 0.286 |
| TSS | 0.976 | 0.464 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(m) Electrocoating rinse.
Subpart H - BPT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of zinc electrocoated | ||
| Chromium | 1.01 | 0.412 |
| Copper | 4.35 | 2.29 |
| Cyanide | 0.664 | 0.275 |
| Zinc | 3.35 | 1.40 |
| Oil and grease | 45.8 | 27.5 |
| TSS | 93.9 | 44.7 |
| pH | ( 1) | ( 1) |
1 Within the range of 7.5 to 10.0 at all times.
(n) Degreasing spent solvents - subpart H - BPT. There shall be no discharge of process wastewater pollutants.
[50 FR 34270, Aug. 23, 1985; 51 FR 2888, Jan. 22, 1986]