{"data":{"id":"us/40-cfr-421.102","jurisdiction":"us","citation":"40 CFR 421.102","heading":"Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.","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 practicable technology currently available:\n(a) Subpart J—Tungstic Acid Rinse.\nBPT 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 17.230 8.205\nZinc 59.900 25.030\nAmmonia (as N) 5,469.000 2,404.00\nTotal suspended solids 1,682.000 800.000\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\n(b) Subpart J—Acid Leach Wet Air Pollution Control.\nBPT 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 15.040 7.162\nZinc 52.280 21.840\nAmmonia (as N) 4,773.000 2,098.000\nTotal suspended solids 1,468.000 698.300\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\n(c) Subpart J—Alkali Leach Wash.\nBPT 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\nTotal suspended solids 0.000 0.000\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\n(d) Subpart J—Alkali Leach Wash Condensate.\nBPT 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 8.057 3.837\nZinc 28.011 11.700\nAmmonia (as N) 2,557.000 1,124.000\nTotal suspended solids 786.200 374.100\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\n(e) Subpart J—Ion Exchange Raffinate (Commingled With Other Process or Nonprocess Waters).\nBPT 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 37.160 17.700\nZinc 129.200 53.970\nAmmonia (as N) 11,790.000 5,185.000\nTotal Suspended solids 3,627.000 1,726.000\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\n(f) Subpart J—Ion Exchange Raffinate (Not Commingled With Other Process or Nonprocess Waters).\nBPT 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 37.160 17.700\nZinc 129.200 53.970\nAmmonia (as N) (2) 11,790.000 5,185.000\nTotal suspended solids 3,627.000 1,726.000\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\n2 The effluent limitation guideline 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.\nBPT Effluent Limitations\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 31.000 14.760\nZinc 107.800 45.020\nAmmonia (as N) 9,838.000 4,325.000\nTotal suspended solids 3,026.000 1,439.000\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\n(h) Subpart J—Crystallization and Drying of Ammonium Paratungstate.\nBPT Effluent Limitations\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\nTotal suspended solids 0.000 0.000\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\n(i) Subpart J—Ammonium Paratungstate Conversion to Oxides Wet Air Pollution Control.\nBPT Effluent Limitations\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 11.600 5.523\nZinc 40.320 16.850\nAmmonia (as N) 3,681.000 1,618.000\nTotal suspended solids 1,132.000 538.500\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\n(j) Subpart J—Ammonium Paratungstate Conversion to Oxides Water of Formation.\nBPT Effluent Limitations\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 0.026 0.013\nZinc 0.092 0.038\nAmmonia (as N) 8.398 3.692\nTotal suspended solids 2.583 1.229\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\n(k) Subpart J—Reduction to Tungsten Wet Air Pollution Control.\nBPT 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 12.940 6.161\nZinc 44.970 18.790\nAmmonia (as N) 4,106.000 1,805.000\nTotal suspended solids 1,263.000 600.700\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\n(l) Subpart J—Reduction to Tungsten Water of Formation.\nBPT 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 .205 .098\nZinc .714 .298\nAmmonia (as N) 65.190 28.660\nTotal suspended solids 20.050 9.536\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\n(m) Subpart J—Tungsten Powder Acid Leach and Wash.\nBPT 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 1.008 0.48\nZinc 3.504 1.464\nAmmonia (as N) 319.900 140.700\nTotal suspended solids 98.400 46.800\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.\n(n) Subpart J—Molybdenum Sulfide Precipitation Wet Air Pollution Control.\nBPT 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 .000 .000\nZinc .000 .000\nAmmonia (as N) .000 .000\nTotal suspended solids .000 .000\npH (1) (1)\n1 Within the range of 7.0 to 10.0 at all times.","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":"f55e0f6c91df1339daf582c56aeab0937b7af99d0e948bcfd37124ffeb96fa8d","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.101","next":"us/40-cfr-421.103"},"notice":"GroundRules: Original legal text. Not legal advice."}