U.S. Code of Federal Regulations

Regulations most recently checked for updates: Oct 04, 2022

§ 471.92 - 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 I - BAT. There shall be no discharge of process wastewater pollutants.

(b) Drawing spent lubricants - subpart I - BAT. There shall be no discharge of process wastewater pollutants.

(c) Extrusion spent emulsions - subpart I - BAT. There shall be no discharge of process wastewater pollutants.

(d) Extrusion press hydraulic fluid leakage.

Subpart I - BAT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds of zirconium-hafnium extruded
Chromium0.1040.043
Cyanide0.0690.029
Nickel0.4550.301
Ammonia31.613.9
Fluoride14.16.26

(e) Swaging spent neat oils. There shall be no discharge of process wastewater pollutants.

(f) Heat treatment contact cooling water.

Subpart I - BAT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of zirconium-hafnium heat treated
Chromium0.0150.006
Cyanide0.0100.004
Nickel0.0660.044
Ammonia4.572.01
Fluoride2.040.906

(g) Tube Reducing Spent Lubricant - subpart I - BAT. (1) There shall be no discharge of process wastewater pollutants except as provided under paragraph (g)(2) of this section.

(2) Process wastewater pollutants may be discharged, with no allowance for any pollutants discharged, provided the facility owner or operator demonstrates, on the basis of analytical methods set forth in or approved pursuant to 40 CFR part 136, that the concentrations of nitrosamine compounds in the wastewater discharged from the tube reducing process do not exceed 0.050 mg/l of N-nitrosodimethylamine, 0.020 mg/l of N-nitrosodiphenylamine, and 0.020 mg/l of N-nitrosodi-n-propylamine.

(3) The demonstration required under paragraph (g)(2) of this section shall be made once per month until the demonstration has been made for all three nitrosamine compounds for six consecutive months, after which time the demonstration may be made once per quarter. If a sample is found to contain any of the foregoing nitrosamine compounds at concentrations greater than those specified in paragraph (g)(2) of this section, the actions described in paragraph (g)(4) of this section shall be taken, and the demonstration required under paragraph (g)(2) of this section shall be made once per month until it has been made for all three nitrosamine compounds for six consecutive months.

(4) If sampling results show that any of the foregoing nitrosamine compounds is present in the process wastewater at concentrations greater than those specified in paragraph (g)(2) of this section, the facility owner or operator shall ensure that, within thirty days of receiving written notification of the sampling results, there is no further discharge of tube reducing spent lubricant wastewater until the owner or operator:

(i) Performs a subsequent analysis which demonstrates that the concentrations of the foregoing nitrosamine compounds do not exceed the levels specified in paragraph (g)(2) of this section; or

(ii) Substitutes a new tube reducing lubricant and thereafter complies with the requirements of paragraph (g)(3) of this section; or

(iii) Determines the source of the pollutant whose concentration exceeded the level specified in paragraph (g)(2) of this section and demonstrates to the satisfaction of the NPDES issuing authority that such source has been eliminated.

(5) The concentration limits specified in paragraph (g)(2) of this section apply at the point of discharge from the tube reducing process. However, sampling after the tube reducing wastewater has been commingled with other wastewaters is permitted if:

(i) Any dilution caused by the other wastewaters is taken into account in determining the appropriate (i.e., lower) allowable discharge concentration; and

(ii) An analytical method of sufficient sensitivity is used to measure the levels of each of the foregoing nitrosamine compounds in the wastewaters being sampled.

(h) Surface treatment spent baths.

Subpart I - BAT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of zirconium-hafnium surface treated
Chromium0.1500.061
Cyanide0.0990.041
Nickel0.6530.432
Ammonia45.320
Fluoride20.38.98

(i) Surface treatment rinse.

Subpart I - BAT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of zirconium-hafnium surface treated
Chromium0.3910.160
Cyanide0.2580.107
Nickel1.711.13
Ammonia11952.1
Fluoride52.923.5

(j) Alkaline cleaning spent baths.

Subpart I - BAT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of zirconium-hafnium alkaline cleaned
Chromium0.7040.288
Cyanide0.4640.192
Nickel3.072.03
Ammonia21493.8
Fluoride95.242.3

(k) Alkaline cleaning rinse.

Subpart I - BAT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of zirconium-hafnium alkaline cleaned
Chromium1.3800.565
Cyanide0.9110.377
Nickel6.033.99
Ammonia419184
Fluoride18782.9

(l) Sawing or grinding spent emulsions.

Subpart I - BAT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of zirconium-hafnium sawed or ground with emulsions
Chromium0.1240.051
Cyanide0.0820.034
Nickel0.5400.357
Ammonia37.516.5
Fluoride16.77.42

(m) Wet air pollution control scrubber blowdown - Subpart I - BAT. There shall be no allowance for the discharge of process wastewater pollutants.

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

(o) Degreasing rinse - subpart I - BAT. There shall be no discharge of process wastewater pollutants.

(p) Molten salt rinse.

Subpart I - BAT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of zirconium-hafnium treated with molten salt
Chromium0.3330.136
Cyanide0.2200.091
Nickel1.450.960
Ammonia10144.3
Fluoride45.020.0

(q) Sawing or grinding contact cooling water.

Subpart I - BAT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of zirconium-hafnium sawed or ground with contact cooling water
Chromium0.1420.058
Cyanide0.0930.039
Nickel0.6170.408
Ammonia42.818.8
Fluoride19.18.48

(r) Sawing or grinding rinse.

Subpart I - BAT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of sawed or ground zirconium-hafnium rinsed
Chromium0.0790.033
Cyanide0.0520.022
Nickel0.3460.229
Ammonia24.010.6
Fluoride10.74.75

(s) Sawing or grinding spent neat oils - subpart I - BAT. There shall be no discharge of process wastewater pollutants.

(t) Inspection and testing wastewater.

Subpart I - BAT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of zirconium-hafnium tested
Chromium0.0070.003
Cyanide0.0050.002
Nickel0.0300.020
Ammonia2.060.903
Fluoride0.9170.407
[50 FR 34270, Aug. 23, 1985; 51 FR 2888, Jan. 22, 1986, as amended at 54 FR 11351, Mar. 17, 1989]