{"data":{"id":"us/40-cfr-420.97","jurisdiction":"us","citation":"40 CFR 420.97","heading":"Effluent limitations representing the degree of effluent reduction attainable by the application of the best conventional technology (BCT).","body":"Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best conventional technology.\n(a) Sulfuric acid pickling (spent acid solutions and rinse waters)—(1) Rod, wire and coil.\nSubpart I\nPollutant or pollutant property BCT effluent limitations\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKg/kkg (pounds per 1,000 lb) of product\nTSS 0.0819 0.0350\nO\u0026G 1 0.0350 0.0117\npH (2) (2)\n1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.\n2 Within the range of 6.0 to 9.0.\n(2) Bar, billet and bloom.\nSubpart I\nPollutant or pollutant property BCT effluent limitations\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKg/kkg (pounds per 1,000 lb) of product\nTSS 0.0263 0.0113\nO\u0026G 1 0.0113 0.00376\npH (2) (2)\n1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.\n2 Within the range of 6.0 to 9.0.\n(3) Strip, sheet and plate.\nSubpart I\nPollutant or pollutant property BCT effluent limitations\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKg/kkg (pounds per 1,000 lb) of product\nTSS 0.0526 0.0225\nO\u0026G 1 0.0225 0.00751\npH (2) (2)\n1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.\n2 Within the range of 6.0 to 9.0.\n(4) Pipe, tube and other products.\nSubpart I\nPollutant or pollutant property BCT effluent limitations\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKg/kkg (pounds per 1,000 lb) of product\nTSS 0.146 0.0626\nO\u0026G 1 0.0626 0.0209\npH (2) (2)\n1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.\n2 Within the range of 6.0 to 9.0.\n(5) Fume scrubbers.\nSubpart I\nPollutant or pollutant property BCT effluent limitations\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKilograms per day\nTSS 5.72 2.45\nO\u0026G 1 2.45 0.819\npH (2) (2)\n1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.\n2 Within the range of 6.0 to 9.0.\nThe above limitations shall be applicable to each fume scrubber associated with a sulfuric acid pickling operation.\n(b) Hydrochloric acid pickling (spent acid solutions and rinse waters)—(1) Rod, wire and coil.\nSubpart I\nPollutant or pollutant property BCT effluent limitations\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKg/kkg (pounds per 1,000 lb) of product\nTSS 0.143 0.0613\nO\u0026G 1 0.0613 0.0204\npH (2) (2)\n1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.\n2 Within the range of 6.0 to 9.0.\n(2) Strip, sheet and plate.\nSubpart I\nPollutant or pollutant property BCT effluent limitations\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKg/kkg (pounds per 1,000 lb) of product\nTSS 0.0819 0.0350\nO\u0026G 1 0.0350 0.0117\npH (2) (2)\n1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.\n2 Within the range of 6.0 to 9.0.\n(3) Pipe, tube and other products.\nSubpart I\nPollutant or pollutant property BCT effluent limitations\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKg/kkg (pounds per 1,000 lb) of product\nTSS 0.298 0.128\nO\u0026G 1 0.128 0.0426\npH (2) (2)\n1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.\n2 Within the range of 6.0 to 9.0\n(4) Fume scrubbers.\nSubpart I\nPollutant or pollutant property BCT effluent limitations\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKilograms per day\nTSS 5.72 2.45\nO\u0026G 1 2.45 0.819\npH (2) (2)\n1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.\n2 Within the range of 6.0 to 9.0.\nThe above limitations shall be applicable to each fume scrubber associated with a hydrochloric acid pickling operation.\n(5) Acid regeneration (absorber vent scrubber).\nSubpart I\nPollutant or pollutant property BCT effluent limitations\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKilograms per day\nTSS 38.2 16.3\nO\u0026G 1 16.3 5.45\npH (2) (2)\n1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.\n2 Within the range of 6.0 to 9.0.\nThe above limitations shall be applicable to the absorber vent scrubber wastewater associated with hydrochloric acid regeneration plants.\n(c) Combination acid pickling (spent acid solution and rinse waters)—(1) Rod, wire, and coil.\nSubpart I\nPollutant or pollutant property BCT effluent limitations\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKg/kkg (pounds per 1,000 lb) of product\nTSS 0.149 0.0638\nO\u0026G 1 0.0638 0.0213\npH (2) (2)\n1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.\n2 Within the range of 6.0 to 9.0.\n(2) Bar, billet, and bloom.\nSubpart I\nPollutant or pollutant property BCT effluent limitations\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKg/kkg (pounds per 1,000 lb) of product\nTSS 0.0672 0.0288\nO\u0026G 1 0.0288 0.00960\npH (2) (2)\n1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.\n2 Within the range of 6.0 to 9.0.\n(3) Strip, sheet, and plate—continuous.\nSubpart I\nPollutant or pollutant property BCT effluent limitations\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKg/kkg (pounds per 1,000 lb) of product\nTSS 0.438 0.188\nO\u0026G 1 0.188 0.0626\npH (2) (2)\n1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.\n2 Within the range of 6.0 to 9.0.\n(4) Strip, sheet and plate—batch.\nSubpart I\nPollutant or pollutant property BCT effluent limitations\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKg/kkg (pounds per 1,000 lb) of product\nTSS 0.134 0.0576\nO\u0026G 1 0.0576 0.0192\npH (2) (2)\n1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.\n2 Within the range of 6.0 to 9.0.\n(5) Pipe, tube, and other products.\nSubpart I\nPollutant or pollutant property BCT effluent limitations\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKg/kkg (pounds per 1,000 lb) of product\nTSS 0.225 0.0964\nO\u0026G 1 0.0964 0.0321\npH (2) (2)\n1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.\n2 Within the range of 6.0 to 9.0.\n(6) Fume scrubbers.\nSubpart I\nPollutant or pollutant property BCT effluent limitations\nMaximum for any 1 day Average of daily values for 30 consecutive days\nKilograms per day\nTSS 5.72 2.45\nO\u0026G 1 2.45 0.819\npH (2) (2)\n1 The limitations for oil and grease shall be applicable when acid pickling wastewaters are treated with cold rolling wastewaters.\n2 Within the range of 6.0 to 9.0.\nThe above limitations shall be applicable to each fume scrubber associated with a combination acid pickling operation.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS","PART 420—IRON AND STEEL MANUFACTURING POINT SOURCE CATEGORY","Subpart I—Acid Pickling 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":"27e47bbe8ab30f86ec578d57db92b86984a969982c275902d4d697f3c3c767ec","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-420.96","next":"us/40-cfr-420.100"},"notice":"GroundRules: Original legal text. Not legal advice."}