{"data":{"id":"us/40-cfr-421.336","jurisdiction":"us","citation":"40 CFR 421.336","heading":"Pretreatment standards for new sources.","body":"Except as provided in 40 CFR 403.7, any new 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 new sources. The mass of wastewater pollutants in primary zirconium and hafnium process wastewater introduced into a POTW shall not exceed the following values:\n(a) Sand drying wet air pollution control.\nPSNS 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\n(b) Sand chlorination off-gas wet air pollution control.\nPSNS 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) 8.690 3.478\nLead 12.170 5.651\nNickel 23.910 16.080\nAmmonia (as N) 5,795.000 2,547.000\n(c) Sand chlorination area vent wet air pollution control.\nPSNS 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\n(d) SiCl4 purification wet air pollution control.\nPSNS 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\n(e) Feed makeup wet air pollution control.\nPSNS 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\n(f) Iron extraction (MIBK) steam stripper bottoms.\nPSNS 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\n(g) Zirconium filtrate.\nPSNS 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 21.340 14.350\nAmmonia (as N) 5,171.000 2,273.000\n(h) Hafnium filtrate.\nPSNS 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\n(i) Calcining caustic wet air pollution control.\nPSNS 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\n(j) Pure chlorination wet air pollution control.\nPSNS 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 21.007 14.180\nAmmonia (as N) 5,108.000 2,245,000\n(k) Reduction area-vent wet air pollution control.\nPSNS 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\n(l) Magnesium recovery off-gas wet air pollution control.\nPSNS 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\n(m) Magnesium recovery area-vent wet air pollution control.\nPSNS 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) 1,535,000 675.00\n(n) Zirconium chip crushing wet air pollution control.\nPSNS 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\n(o) Acid leachate from zirconium metal production.\nPSNS 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 1,674.00\n(p) Acid leachate from zirconium alloy production.\nPSNS 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\n(q) Leaching rinse water from zirconium metal production.\nPSNS 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\n(r) Leaching rinse water from zirconium alloy production.\nPSNS 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","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":"a495bf6721c9fae438f0d96c969c6052be398cd6364f391f1998e5da44347f66","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.335","next":"us/40-cfr-421.337"},"notice":"GroundRules: Original legal text. Not legal advice."}