{"data":{"id":"us/40-cfr-421.292","jurisdiction":"us","citation":"40 CFR 421.292","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) Tin smelter SO2 scrubber.\nBPT Limitations for the Secondary Tin Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of crude tapped tin metal produced\nArsenic 19.220 8.554\nLead 3.863 1.840\nIron 11.040 5.611\nTin 3.495 2.024\nTotal suspended solids 377.100 179.400\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(b) Dealuminizing rinse.\nBPT Limitations for the Secondary Tin Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of dealuminized scrap produced\nLead 0.015 0.007\nCyanide (total) 0.010 0.004\nFluoride 1.225 0.700\nTin 0.013 0.008\nTotal suspended solids 1.435 0.683\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(c) Tin mud acid neutralization filtrate.\nBPT Limitations for the Secondary Tin Subcategory\nPollutant or pollutant property Minimum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of neutralized, dewatered tin mud produced\nLead 2.120 1.009\nCyanide (total) 1.464 0.606\nFluoride 176.600 100.400\nTin 1.918 1.110\nTotal suspended solids 206.900 98.420\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(d) Tin hydroxide wash.\nBPT Limitations for the Secondary Tin Subcategory\nPollutant or pollutant property Minimum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of tin hydroxide washed\nLead 5.020 2.391\nCyanide (total) 3.466 1.434\nFluoride 418.400 237.900\nTin 4.542 2.630\nTotal suspended solids 490.100 233.100\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(e) Spent electrowinning solution from new scrap.\nBPT Limitations for the Secondary Tin Subcategory\nPollutant or pollutant property Minimum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of cathode tin produced\nLead 7.056 3.360\nCyanide (total) 4.872 2.016\nFluoride 588.000 334.300\nTin 6.384 3.696\nTotal suspended solids 688.800 327.600\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(f) Spent electrowinning solution from municipal solid waste.\nBPT Limitations for the Secondary Tin Subcategory\nPollutant or pollutant property Minimum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of MSW scrap used as raw material\nLead 0.050 0.024\nCyanide (total) 0.035 0.014\nFluoride 4.165 2.368\nTin 0.045 0.026\nTotal suspended solids 4.879 2.321\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(g) Tin hydroxide supernatant from scrap.\nBPT Limitations for the Secondary Tin Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of tin metal recovered from scrap\nLead 23.370 11.130\nCyanide (total) 16.140 6.677\nFluoride 1,947.000 1,107.000\nTin 21.140 12.240\nTotal suspended solids 2,281.000 1,085.000\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(h) Tin hydroxide supernatant from plating solutions and sludges.\nBPT Limitations for the Secondary Tin Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of tin metal recovered from plating solutions and sludges\nLead 48.30 23.00\nCyanide (total) 33.35 13.80\nFluoride 4,025.00 2,289.00\nTin 43.70 25.30\nTotal suspended solids 4,715.00 2,243.00\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(i) Tin hydroxide filtrate.\nBPT Limitations for the Secondary Tin Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of tin metal produced\nLead 10.520 5.009\nCyanide (total) 7.263 3.005\nFluoride 876.500 498.400\nTin 9.517 5.510\nTotal suspended solids 1,027.000 488.400\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 AA—Secondary Tin 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":"c99d57189fad458fb9736b61c6fa9cd1653c250958783cbd73995a17f1705825","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.291","next":"us/40-cfr-421.293"},"notice":"GroundRules: Original legal text. Not legal advice."}