40 C.F.R. § 471.42

Current through September 30, 2024
Section 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
Cadmium0.0260.012
Copper0.1470.077
Cyanide0.0230.010
Silver0.0320.013

(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
Cadmium0.0160.007
Copper0.0910.048
Cyanide0.0140.006
Silver0.0200.008

(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
Cadmium0.0010.0005
Copper0.0060.003
Cyanide0.00090.0004
Silver0.0020.0006

(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
Cadmium2.271.00
Copper12.76.68
Cyanide1.940.802
Silver2.741.14

(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
Cadmium0.1420.063
Copper0.7930.417
Cyanide0.1210.050
Silver0.1710.071

(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
Cadmium0.3500.155
Copper1.961.03
Cyanide0.2990.124
Silver0.4230.175

(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
Cadmium0.36760.162
Copper2.051.08
Cyanide0.3130.130
Silver0.4430.184

(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
Cadmium0.1250.055
Copper0.6980.367
Cyanide0.1070.044
Silver0.1510.063

(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
Cadmium0.02970.013
Copper0.1590.084
Cyanide0.02470.010
Silver0.03420.014

(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
Cadmium0.0330.015
Copper0.1830.097
Cyanide0.0280.012
Silver0.0400.017

(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
Cadmium0.2100.093
Copper1.170.616
Cyanide0.1790.074
Silver0.2530.105

(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
Cadmium0.0210.009
Copper0.1140.060
Cyanide0.0180.007
Silver0.0250.010

(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
Cadmium0.3810.168
Copper2.131.12
Cyanide0.3250.135
Silver0.4590.191

(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
Cadmium0.4000.174
Copper2.2101.16
Cyanide0.3370.139
Silver0.4760.197

(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
Cadmium0.4120.182
Copper2.3001.21
Cyanide0.3510.145
Silver0.4960.206

(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
Cadmium0.03270.014
Copper0.1780.094
Cyanide0.02770.011
Silver0.03810.016

(v)Degreasing spent solvents-subpart D-BAT. There shall be no discharge of process wastewater pollutants.

40 C.F.R. §471.42

50 FR 34270, Aug. 23, 1985; 51 FR 2886, Jan. 22, 1986