Code of Federal Regulations (Last Updated: July 5, 2024) |
Title 40 - Protection of Environment |
Chapter I - Environmental Protection Agency |
SubChapter N - Effluent Guidelines and Standards |
Part 471 - Nonferrous Metals Forming and Metal Powders Point Source Category |
Subpart D - Precious Metals Forming Subcategory |
§ 471.42 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT).
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§ 471.42 Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT).
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]