{"data":{"id":"us/40-cfr-421.232","jurisdiction":"us","citation":"40 CFR 421.232","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) Raw Material dust control.\nBPT Limitations for the Primary Nickel and Cobalt Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of copper, nickel, and cobalt in the crushed raw material\nCopper 0.146 0.077\nNickel 0.148 0.098\nAmmonia (as N) 10.260 4.512\nCobalt 0.016 0.007\nTotal suspended solids 3.157 1.502\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(b) Nickel wash water.\nBPT Limitations for the Primary Nickel and Cobalt Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of nickel powder washed\nCopper 0.064 0.034\nNickel 0.065 0.043\nAmmonia (as N) 4.515 1.985\nCobalt 0.007 0.003\nTotal suspended solids 1.389 0.660\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(c) Nickel reduction decant.\nBPT Limitations for the Primary Nickel and Cobalt Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of nickel produced\nCopper 24.120 12.700\nNickel 24.370 16.120\nAmmonia (as N) 1,692.000 743.900\nCobalt 2.666 1.143\nTotal suspended solids 520.500 247.600\npH (1) (1)\n1 Within the range of 7.5 to 10.0 at all times.\n(d) Cobalt reduction decant.\nBPT Limitations for the Primary Nickel and Cobalt Subcategory\nPollutant or pollutant property Maximum for any 1 day Maximum for monthly average\nmg/kg (pounds per million pounds) of cobalt produced\nCopper 40.660 21.400\nNickel 41.080 27.180\nAmmonia (as N) 2,852.000 1,254.000\nCobalt 4.494 1.926\nTotal suspended solids 877.300 417.300\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 U—Primary Nickel and Cobalt 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":"b969ad1869ecf56399448fd1101393000f70d96c2f8f1f7d930d6c8322325af0","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-421.231","next":"us/40-cfr-421.233"},"notice":"GroundRules: Original legal text. Not legal advice."}