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 representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT):
(a) Rolling spent neat oils—subpart D—BAT. There shall be no discharge of wastewater pollutants.
(b) Rolling spent emulsions.
Subpart D—BAT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of precious metals rolled with emulsions | ||
| Cadmium | 0.026 | 0.012 |
| Copper | 0.147 | 0.077 |
| Cyanide | 0.023 | 0.010 |
| Silver | 0.032 | 0.013 |
(c) Drawing spent neat oils—subpart D—BAT. There shall be no discharge of process wastewater pollutants.
(d) Drawing spent emulsions.
Subpart D—BAT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of precious metals drawn with emulsions | ||
| Cadmium | 0.016 | 0.007 |
| Copper | 0.091 | 0.048 |
| Cyanide | 0.014 | 0.006 |
| Silver | 0.020 | 0.008 |
(e) Drawing spent soap solutions.
Subpart D—BAT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of precious metals drawn with soap solutions | ||
| Cadmium | 0.001 | 0.0005 |
| Copper | 0.006 | 0.003 |
| Cyanide | 0.0009 | 0.0004 |
| Silver | 0.002 | 0.0006 |
(f) Metal powder production wet atomization wastewater.
Subpart D—BAT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of precious metals powder wet atomized | ||
| Cadmium | 2.27 | 1.00 |
| Copper | 12.7 | 6.68 |
| Cyanide | 1.94 | 0.802 |
| Silver | 2.74 | 1.14 |
(g) Heat treatment contact cooling water.
Subpart D—BAT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of precious metals heat treated | ||
| Cadmium | 0.142 | 0.063 |
| Copper | 0.793 | 0.417 |
| Cyanide | 0.121 | 0.050 |
| Silver | 0.171 | 0.071 |
(h) Semi-continuous and continuous casting contact cooling water.
Subpart D—BAT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of precious metals cast by the semi-continuous or continuous method | ||
| Cadmium | 0.350 | 0.155 |
| Copper | 1.96 | 1.03 |
| Cyanide | 0.299 | 0.124 |
| Silver | 0.423 | 0.175 |
(i) Stationary casting contact cooling water—subpart D—BAT. There shall be no discharge of process wastewater pollutants.
(j) Direct chill casting contact cooling water.
Subpart D—BAT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of precious metals cast by the direct chill method | ||
| Cadmium | 0.3676 | 0.162 |
| Copper | 2.05 | 1.08 |
| Cyanide | 0.313 | 0.130 |
| Silver | 0.443 | 0.184 |
(k) Shot casting contact cooling water.
Subpart D—BAT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of precious metals shot cast | ||
| Cadmium | 0.125 | 0.055 |
| Copper | 0.698 | 0.367 |
| Cyanide | 0.107 | 0.044 |
| Silver | 0.151 | 0.063 |
(l) Wet air pollution control scrubber blowdown—subpart D—BAT. There shall be no discharge of process wastewater pollutants.
(m) Pressure bonding contact cooling water.
Subpart D—BAT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of precious metal and base metal pressure bonded | ||
| Cadmium | 0.0297 | 0.013 |
| Copper | 0.159 | 0.084 |
| Cyanide | 0.0247 | 0.010 |
| Silver | 0.0342 | 0.014 |
(n) Surface treatment spent baths.
Subpart D—BAT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of precious metals surface treated | ||
| Cadmium | 0.033 | 0.015 |
| Copper | 0.183 | 0.097 |
| Cyanide | 0.028 | 0.012 |
| Silver | 0.040 | 0.017 |
(o) Surface treatment rinse.
Subpart D—BAT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of precious metals surface treated | ||
| Cadmium | 0.210 | 0.093 |
| Copper | 1.17 | 0.616 |
| Cyanide | 0.179 | 0.074 |
| Silver | 0.253 | 0.105 |
(p) Alkaline cleaning spent baths.
Subpart D—BAT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of precious metals alkaline cleaned | ||
| Cadmium | 0.021 | 0.009 |
| Copper | 0.114 | 0.060 |
| Cyanide | 0.018 | 0.007 |
| Silver | 0.025 | 0.010 |
(q) Alkaline cleaning rinse.
Subpart D—BAT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of precious metals alkaline cleaned | ||
| Cadmium | 0.381 | 0.168 |
| Copper | 2.13 | 1.12 |
| Cyanide | 0.325 | 0.135 |
| Silver | 0.459 | 0.191 |
(r) Alkaline cleaning prebonding wastewater.
Subpart D—BAT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of precious metal and base metal cleaned prior to bonding | ||
| Cadmium | 0.400 | 0.174 |
| Copper | 2.210 | 1.16 |
| Cyanide | 0.337 | 0.139 |
| Silver | 0.476 | 0.197 |
(s) Tumbling or burnishing wastewater.
Subpart D—BAT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of precious metals tumbled or burnished | ||
| Cadmium | 0.412 | 0.182 |
| Copper | 2.300 | 1.21 |
| Cyanide | 0.351 | 0.145 |
| Silver | 0.496 | 0.206 |
(t) Sawing or grinding spent neat oils—subpart D—BAT. There shall be no discharge of process wastewater pollutants.
(u) Sawing or grinding spent emulsions.
Subpart D—BAT
| Pollutant or pollutant property | Maximum for any 1 day | Maximum for monthly average |
|---|---|---|
| mg/off-kg (pounds per million off-pounds) of precious metals sawed or ground with emulsions | ||
| Cadmium | 0.0327 | 0.014 |
| Copper | 0.178 | 0.094 |
| Cyanide | 0.0277 | 0.011 |
| Silver | 0.0381 | 0.016 |
(v) Degreasing spent solvents—subpart D—BAT. There shall be no discharge of process wastewater pollutants.
[50 FR 34270, Aug. 23, 1985; 51 FR 2886, Jan. 22, 1986]
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