{
  "url": "https://openlegislation.uk/eu-decision-2012-135/annex/division-3/division-1.4/division-2/division-56",
  "json_url": "https://openlegislation.uk/eu-decision-2012-135/annex/division-3/division-1.4/division-2/division-56.json",
  "legislation": "eudn/2012/135",
  "legislation_title": "Commission Implementing Decision of 28 February 2012 establishing the best available techniques (BAT) conclusions under Directive 2010/75/EU of the European Parliament and of the Council on industrial emissions for iron and steel production (notified under document C(2012) 903) (Text with EEA relevance) (2012/135/EU)",
  "legislation_url": "https://openlegislation.uk/eu-decision-2012-135",
  "path": "annex/division/3/division/1.4/division/2/division/56",
  "kind": "division",
  "number": "56",
  "heading": null,
  "text": "BAT for pretreated waste water from the coking process and coke oven gas (COG) cleaning is to use biological waste water treatment with integrated denitrification/nitrification stages.\nThe BAT-associated emission levels, based on a qualified random sample or a 24-hour composite sample and referring only to single coke oven water treatment plants, are:\nIn some cases, TOC is measured instead of COD (in order to avoid HgCl2 used in the analysis for COD). The correlation between COD and TOC should be elaborated for each coke oven plant case by case. The COD/TOC ratio may vary approximately between two and four.\nThis level is based on the use of the DIN 38405 D 27 or any other national or international standard that ensures the provision of data of an equivalent scientific quality.\nThis level is based on the use of the DIN 38405 D 13-2 or any other national or international standard that ensures the provision of data of an equivalent scientific quality.\n—\nchemical oxygen demand (COD)\n< 220 mg/l\n—\nbiological oxygen demand for 5 days (BOD5)\n< 20 mg/l\n—\nsulphides, easily released\n< 0,1 mg/l\n—\nthiocyanate (SCN-)\n< 4 mg/l\n—\ncyanide (CN-), easily released\n< 0,1 mg/l\n—\npolycyclic aromatic hydrocarbons (PAH)\n(sum of Fluoranthene, Benzo[b]fluoranthene, Benzo[k]fluoranthene, Benzo[a]pyrene, Indeno[1,2,3-cd]pyrene and Benzo[g,h,i]perylene)\n< 0,05 mg/l\n—\nphenols\n< 0,5 mg/l\n—\nsum of ammonia-nitrogen (NH4 +-N),\nnitrate-nitrogen (NO3 --N) and nitrite-nitrogen (NO2 --N)\n< 15 – 50 mg/l.\nRegarding the sum of ammonia-nitrogen (NH4 +-N), nitrate-nitrogen (NO3 --N) and nitrite-nitrogen (NO2 --N), values of < 35 mg/l are usually associated with the application of advanced biological waste water treatment plants with predenitrification/nitrification and post-denitrification.",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "footnote",
      "label": "f1",
      "text": "In some cases, TOC is measured instead of COD (in order to avoid HgCl2 used in the analysis for COD). The correlation between COD and TOC should be elaborated for each coke oven plant case by case. The COD/TOC ratio may vary approximately between two and four."
    },
    {
      "type": "footnote",
      "label": "f2",
      "text": "This level is based on the use of the DIN 38405 D 27 or any other national or international standard that ensures the provision of data of an equivalent scientific quality."
    },
    {
      "type": "footnote",
      "label": "f3",
      "text": "This level is based on the use of the DIN 38405 D 13-2 or any other national or international standard that ensures the provision of data of an equivalent scientific quality."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eudn/2012/135/annex/division/3/division/1.4/division/2/division/56",
    "retrieved_at": "2026-11-01T15:15:30.904983+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}