{"data":{"id":"us/40-cfr-421.332","jurisdiction":"us","citation":"40 CFR 421.332","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) Sand drying wet air pollution control.\nBPT Limitations for the Primary Zirconium and Hafnium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of zirconium dioxide and hafnium dioxide produced\nChromium (total) 0.250 0.102\nCyanide (total) 0.165 0.068\nLead 0.239 0.114\nNickel 1.091 0.721\nAmmonia (as N) 75.710 33.280\nTotal suspended solids 23.290 11.080\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(b) Sand chlorination off-gas wet air pollution control.\nBPT Limitations for the Primary Zirconium and Hafnium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of zironium dioxide and hafnium dioxide produced\nChromium (total) 19.130 7.825\nCyanide (total) 12.610 5.216\nLead 18.260 8.694\nNickel 83.460 55.210\nAmmonia (as N) 5,795.000 2,547.000\nTotal suspended solids 1,782.000 847.700\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(c) Sand chlorination area-vent wet air pollution control.\nBPT Limitations for the Primary Zirconium and Hafnium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of zirconium dioxide and hafnium dioxide produced\nChromium (total) 3.751 1.534\nCyanide (total) 2.472 1.023\nLead 3.580 1.705\nNickel 16.370 10.830\nAmmonia (as N) 1,136.000 449.500\nTotal suspended solids 349.500 166.200\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(d) SiCl4 purification wet air pollution control.\nBPT Limitations for the Primary Zirconium and Hafnium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of zirconium dioxide and hafnium dioxide produced\nChromium (total) 3.299 1.350\nCyanide (total) 2.174 0.900\nLead 3.149 1.500\nNickel 14.400 9.522\nAmmonia (as N) 999.500 439.400\nTotal suspended solids 307.400 146.200\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(e) Feed makeup wet air pollution control.\nBPT Limitations for the Primary Zirconium and Hafnium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of zirconium dioxide and hafnium dioxide produced\nChromium (total) 2.501 1.023\nCyanide (total) 1.648 0.682\nLead 2.387 1.137\nNickel 10.910 7.217\nAmmonia (as N) 757.500 333.000\nTotal suspended solids 233.000 110.800\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(f) Iron extraction (MIBK) steam stripper bottoms.\nBPT Limitations for the Primary Zirconium and Hafnium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of zirconium dioxide and hafnium dioxide produced\nChromium (total) 0.987 0.404\nCyanide (total) 0.651 0.269\nLead 0.942 0.449\nNickel 4.308 2.850\nAmmonia (as N) 299.100 131.500\nTotal suspended solids 92.000 43.760\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(g) Zirconium filtrate.\nBPT Limitations for the Primary Zirconium and Hafnium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of zirconium dioxide and hafnium dioxide produced\nChromium (total) 17.070 6.982\nCyanide (total) 11.250 4.655\nLead 16.290 7.758\nNickel 74.480 49.260\nAmmonia (as N) 5,171.000 2,273.000\nTotal suspended solids 1,590.000 756.400\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(h) Hafnium filtrate.\nBPT Limitations for the Primary Zirconium and Hafnium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of zirconium dioxide and hafnium dioxide produced\nChromium (total) 0.000 0.000\nCyanide (total) 0.000 0.000\nLead 0.000 0.000\nNickel 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 7.5 to 10.0 at all times.\n(i) Calcining caustic wet air pollution control.\nBPT Limitations for the Primary Zirconium and Hafnium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of zirconium dioxide and hafnium dioxide produced\nChromium (total) 3.959 1.619\nCyanide (total) 2.609 1.080\nLead 3.779 1.799\nNickel 17.270 11.430\nAmmonia (as N) 1,199.000 527.200\nTotal suspended solids 368.900 175.400\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(j) Pure chlorination wet air pollution control.\nBPT Limitations for the Primary Zirconium and Hafnium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of zirconium and hafnium produced\nChromium (total) 16.860 6.897\nCyanide (total) 11.110 4.598\nLead 16.090 7.663\nNickel 73.570 48.660\nAmmonia (as N) 5,108.000 2,245.000\nTotal suspended solids 1,571.000 747.200\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(k) Reduction area-vent wet air pollution control.\nBPT Limitations for the Primary Zirconium and Hafnium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of zirconium and hafnium produced\nChromium (total) 1.622 0.663\nCyanide (total) 1.069 0.442\nLead 1.548 0.737\nNickel 7.077 4.681\nAmmonia (as N) 491.300 216.000\nTotal suspended solids 151.100 71.880\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(l) Magnesium recovery off-gas wet air pollution control.\nBPT Limitations for the Primary Zirconium and Hafnium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of zirconium and hafnium produced\nChromium (total) 9.123 3.732\nCyanide (total) 6.013 2.488\nLead 8.708 4.147\nNickel 39.810 26.330\nAmmonia (as N) 2,764.000 1,215.000\nTotal suspended solids 850.100 404.300\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(m) Magnesium recovery area-vent wet air pollution control.\nBPT Limitations for the Primary Zirconium and Hafnium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of zirconium and hafnium produced\nChromium (total) 5.068 2.073\nCyanide (total) 3.340 1.382\nLead 4.838 2.304\nNickel 22.110 14.630\nAmmonia (as N) 1,535.000 675.000\nTotal suspended solids 472.200 224.600\npH (1) (1)\n1 Within the range of 7.5 to 10.0. .\n(n) Zirconium chip crushing wet air pollution control.\nBPT Limitations for the Primary Zirconium and Hafnium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of zirconium and hafnium produced\nChromium (total) 0.000 0.000\nCyanide (total) 0.000 0.000\nLead 0.000 0.000\nNickel 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 7.5 to 10.0 at all times.\n(o) Acid leachate from zirconium metal production.\nBPT Limitations for the Primary Zirconium and Hafnium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of pure zirconium produced\nChromium (total) 12.970 5.304\nCyanide (total- 8.545 3.536\nLead 12.380 5.893\nNickel 56.570 37.420\nAmmonia (as N) 3,928.000 1,727.000\nTotal suspended solids 1,208.000 574.600\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(p) Acid leachate from zirconium alloy production.\nBPT Limitations for the Primary Zirconium and Hafnium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of zirconium contained in alloys produced\nChromium (total) 6.939 2.839\nCyanide (total) 4.574 1.893\nLead 6.624 3.154\nNickel 30.280 20.030\nAmmonia (as N) 2,102.000 924.200\nTotal suspended solids 646.600 307.600\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(q) Leaching rinse water from zirconium metal production.\nBPT Limitations for the Primary Zirconium and Hafnium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of zirconium produced\nChromium (total) 25.930 10.610\nCyanide (total) 17.090 7.072\nLead 24.750 11.790\nNickel 113.200 74.840\nAmmonia (as N) 7,856.000 3,453.000\nTotal suspended solids 2,416.000 1,149.000\npH (1) (1)\n1 Within the range of 7.5 to 10.0.\n(r) Leaching rinse water from zirconium alloy production.\nBPT Limitations for the Primary Zirconium and Hafnium Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of zirconium in alloys produced\nChromium (total) 0.347 0.142\nCyanide (total) 0.229 0.095\nLead 0.331 0.158\nNickel 1.515 1.002\nAmmonia (as N) 105.200 46.240\nTotal suspended solids 32.350 15.390\npH (1) (1)\n1 Within the range of 7.5 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 AE—Primary Zirconium and Hafnium 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":"f9cdc725d9f6270f5d7f25c3588a987e1681f6e1b99a77b9c3703988fad12d7f","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.331","next":"us/40-cfr-421.333"},"notice":"GroundRules: Original legal text. Not legal advice."}