{"data":{"id":"us/40-cfr-421.334","jurisdiction":"us","citation":"40 CFR 421.334","heading":"Standards of performance for new sources.","body":"Any new source subject to this subpart shall achieve the following new source performance standards:\n(a) Sand drying wet air pollution control.\nNSPS 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) 0.210 0.085\nCyanide (total) 0.114 0.045\nLead 0.159 0.074\nNickel 0.312 0.210\nAmmonia (as N) 75.710 33.280\nTotal suspended solids 8.520 6.816\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.\nNSPS 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) 16.080 6.521\nCyanide (total) 8.694 3.478\nLead 12.170 5.651\nNickel 23.910 16.080\nAmmonia (as N) 5,795.000 2,547.000\nTotal suspended solids 652.100 521.000\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.\nNSPS 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) 3.154 1.279\nCyanide (total) 1.705 0.682\nLead 2.387 1.108\nNickel 4.688 3.154\nAmmonia (as N) 1,136.000 499.500\nTotal suspended solids 127.900 102.300\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(d) SiC14 purification wet air pollution control.\nNSPS 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) 2.774 1.125\nCyanide (total) 1.500 0.600\nLead 2.099 0.975\nNickel 4.124 2.774\nAmmonia (as N) 999.500 439.400\nTotal suspended solids 112.500 89.980\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(e) Feed makeup wet air pollution control.\nNSPS 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) 2.103 0.852\nCyanide (total) 1.137 0.455\nLead 1.591 0.739\nNickel 3.126 2.103\nAmmonia (as N) 757.500 333.000\nTotal suspended solids 85.250 68.200\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(f) Iron extraction (MIBK) steam stripper bottoms.\nNSPS 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) 0.830 0.337\nCyanide (total) 0.449 0.180\nLead 0.628 0.292\nNickel 1.234 0.830\nAmmonia (as N) 299.100 131.500\nTotal suspended solids 33.660 26.930\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(g) Zirconium filtrate.\nNSPS 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) 14.350 5.819\nCyanide (total) 7.758 3.103\nLead 10.860 5.043\nNickel 21.330 14.350\nAmmonia (as N) 5,171.000 2,273.000\nTotal suspended solids 581.900 465.500\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(h) Hafnium filtrate.\nNSPS 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.\nNSPS 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) 3.329 1.350\nCyanide (total) 1.799 0.720\nLead 2.519 1.170\nNickel 4.948 3.329\nAmmonia (as N) 1,199.000 527.200\nTotal suspended solids 135.000 108.000\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(j) Pure chlorination wet air pollution control.\nNSPS 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) 14.180 5.748\nCyanide (total) 7.663 3.065\nLead 10.730 4.981\nNickel 21.070 14.180\nAmmonia (as N) 5,108.000 2,245.000\nTotal suspended solids 574.800 459.800\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.\nNSPS 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) 1.364 0.553\nCyanide (total) 0.737 0.295\nLead 1.032 0.479\nNickel 2.027 1.364\nAmmonia (as N) 491.300 216.000\nTotal suspended solids 55.290 44.230\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.\nNSPS 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) 7.671 3.110\nCyanide (total) 4.147 1.659\nLead 5.805 2.695\nNickel 11.400 7.671\nAmmonia (as N) 2,764.000 1,215.000\nTotal suspended solids 404.300 248.800\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.\nNSPS 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) 4.262 1.728\nCyanide (total) 2.304 0.921\nLead 3.225 1.497\nNickel 6.335 4.262\nAmmonia (as N) 1,535.000 675.000\nTotal suspended solids 172.800 138.200\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(n) Zirconium chip crushing west air pollution control.\nNSPS 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.\nNSPS 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) 10.900 4.420\nCyanide (total) 5.893 2.357\nLead 8.250 3.831\nNickel 16.210 10.900\nAmmonia (as N) 3,928.000 1,674.000\nTotal suspended solids 442.000 353.600\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(p) Acid leachate from zirconium alloy production.\nNSPS 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) 5.835 2.366\nCyanide (total) 3.154 1.262\nLead 4.416 2.050\nNickel 8.674 5.835\nAmmonia (as N) 2,102.000 895.800\nTotal suspended solids 236.600 189.300\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.\nNSPS 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) 21.810 8.840\nCyanide (total) 11.790 4.715\nLead 16.500 7.661\nNickel 32.410 21.810\nAmmonia (as N) 7,856.000 3,453.000\nTotal suspended solids 884.000 707.200\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(r) Leaching rinse water from zirconium alloy production.\nNSPS 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) 0.292 0.118\nCyanide (total) 0.158 0.063\nLead 0.221 0.103\nNickel 0.434 0.292\nAmmonia (as N) 105.200 46.240\nTotal suspended solids 11.840 9.468\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":"f51e49eb0fb1d79f81cd7ca5c3f7cd15fc91b56c68776d43bbf53daf945c0764","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.333","next":"us/40-cfr-421.335"},"notice":"GroundRules: Original legal text. Not legal advice."}