{"data":{"id":"us/40-cfr-421.103","jurisdiction":"us","citation":"40 CFR 421.103","heading":"Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.","body":"Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart shall achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable:\n(a) Subpart J—Tungstic Acid Rinse.\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of tungstic acid (as W) produced\nLead 11.490 5.333\nZinc 41.850 17.230\nAmmonia (as N) 5,469.000 2,404.000\n(b) Subpart J—Acid Leach Wet Air Pollution Control.\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of tungstic acid (as W) produced\nLead 1.003 0.466\nZinc 3.653 1.504\nAmmonia (as N) 477.400 209.900\n(c) Subpart J—Alkali Leach Wash.\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of sodium tungstate (as W) produced\nLead 0.000 0.000\nZinc 0.000 0.000\nAmmonia (as N) 0.000 0.000\n(d) Subpart J—Alkali Leach Wash Condensate.\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of sodium tungstate (as W) produced\nLead 5.372 2.494\nZinc 19.570 8.057\nAmmonia (as N) 2,557.000 1,124.000\n(e) Subpart J—Ion Exchange Raffinate (Commingled With Other Process or Nonprocess Waters).\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of ammonium tungstate (as W) produced\nLead 24.780 11.500\nZinc 90.240 37.160\nAmmonia (as N) 11,790.000 5,185.000\n(f) Subpart J—Ion Exchange Raffinate (Not Commingled With Other Process or Nonprocess Waters).\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of ammonium tungstate (as W) produced\nLead 24.780 11.500\nZinc 90.240 37.160\nAmmonia (as N) 1 11,790.000 5,185.000\n1 The effluent limitation for this pollutant does not apply if a) the motor liquor feed to the ion exchange process or the raffinate from the ion exchange process contains sulfates at concentrations exceeding 1000 mg/1; b) this mother liquor or raffinate is treated by ammonia steam stripping; and c) such mother liquor or raffinate is not commingled with any other process or nonprocess waters prior to steam stripping for ammonia removal.\n(g) Subpart J—Calcium Tungstate Precipitate Wash.\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any one day Maximum for monthly average\nmg/kg (pounds per/million pounds) of calcium tungstate (as W) produced\nLead 20.670 9.594\nZinc 75.280 31.000\nAmmonia (as N) 9,838.000 4,325.000\n(h) Subpart J—Crystallization and Drying of Ammonium Paratungstate.\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any one day Maximum for monthly average\nmg/kg (pounds per/million pounds) of ammonium paratungstate (as W) produced\nLead 0.000 0.000\nZinc 0.000 0.000\nAmmonia (as N) 0.000 0.000\n(i) Subpart J—Ammonium Paratungstate Conversion to Oxides Wet Air Pollution Control.\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any one day Maximum for monthly average\nmg/kg (pounds per/million pounds) of tungstic oxide (as W) produced\nLead 0.773 0.359\nZinc 2.817 1.160\nAmmonia (as N) 368.200 161.900\n(j) Subpart J—Ammonium Paratungstate Conversion to Oxides Water of Formation.\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any one day Maximum for monthly average\nmg/kg (pounds per/million pounds) of tungstic oxide (as W) produced\nLead 0.018 0.008\nZinc 0.064 0.026\nAmmonia (as N) 8.398 3.692\n(k) Subpart J—Reduction to Tungsten Wet Air Pollution Control.\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any one day Maximum for monthly average\nmg/kg (pounds per/million pounds) of tungsten metal produced\nLead 0.862 0.400\nZinc 3.142 1.294\nAmmonia (as N) 410.600 180.500\n(l) Subpart J—Reduction to Tungsten Water of Formation.\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any one day Maximum for monthly average\nmg/kg (pounds per/million pounds) of tungsten metal produced\nLead 0.137 0.064\nZinc 0.499 0.205\nAmmonia (as N) 65.190 28.660\n(m) Subpart J—Tungsten Powder Acid Leach and Wash.\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of tungsten metal produced\nLead 0.672 0.312\nZinc 2.448 1.008\nAmmonia (as N) 319.900 140.700\n(n) Subpart J—Molybdenum Sulfide Precipitation Wet Air Pollution Control.\nBAT Effluent Limitations\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of tungsten metal produced\nLead 0.000 0.000\nZinc 0.000 0.000\nAmmonia (as N) 0.000 0.000","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS","PART 421—NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY","Subpart J—Primary Tungsten Subcategory"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"711f086692d39862efa0c1e6eb4e07b736ac8598c12ba2fc47b3bdd5540185b8","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.102","next":"us/40-cfr-421.104"},"notice":"GroundRules: Original legal text. Not legal advice."}