{"data":{"id":"us/40-cfr-421.105","jurisdiction":"us","citation":"40 CFR 421.105","heading":"Pretreatment standards for existing sources.","body":"Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for existing sources. The mass of wastewater pollutants in primary tungsten process wastewater introduced into a POTW shall not exceed the following values:\n(a) Subpart J—Tungstic Acid Rinse.\nPSES\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.\nPSES\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.\nPSES\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of 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.\nPSES\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).\nPSES\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of 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).\nPSES\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 pretreatment standard for this pollutant does not apply if (a) the mother liquor feed to the ion exchange process or the raffinate from the ion exchange process contains sulfates at concentrations exceeding 1000 mg/l; (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.\nPSES\nPollutant or pollutant property Maximum for any 1 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.\nPSES\nPollutant or pollutant property Maximum for any 1 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.\nPSES\nPollutant or pollutant property Maximum for any 1 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.\nPSES\nPollutant or pollutant property Maximum for any 1 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.\nPSES\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of tungsten metal produced\nLead .862 .400\nZinc 3.142 1.294\nAmmonia (as N) 410.600 180.500\n(l) Subpart J—Reduction to Tungsten Water of Formation.\nPSES\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of tungsten metal produced\nLead .137 .064\nZinc .499 .205\nAmmonia (as N) 65.190 28.660\n(m) Subpart J—Tungsten Powder Acid Leach and Wash.\nPSES\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of tungsten metal produced\nLead .672 .312\nZinc 2.448 1.008\nAmmonia (as N) 319.900 140.700\n(n) Subpart J—Molybdenum Sulfide Precipitation Wet Air Pollution Control.\nPSES\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":"5600f863329eebf22eb2cef00dc42543e3285d7626e45f31146f3a34668f2cb0","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.104","next":"us/40-cfr-421.106"},"notice":"GroundRules: Original legal text. Not legal advice."}