{
  "url": "https://openlegislation.uk/eu-decision-2017-1442/annex/division-1/division-1.5/division-3",
  "json_url": "https://openlegislation.uk/eu-decision-2017-1442/annex/division-1/division-1.5/division-3.json",
  "legislation": "eudn/2017/1442",
  "legislation_title": "Commission Implementing Decision (EU) 2017/1442 of 31 July 2017 establishing best available techniques (BAT) conclusions, under Directive 2010/75/EU of the European Parliament and of the Council, for large combustion plants (notified under document C(2017) 5225) (Text with EEA relevance)",
  "legislation_url": "https://openlegislation.uk/eu-decision-2017-1442",
  "path": "annex/division/1/division/1.5/division/3",
  "kind": "division",
  "number": "BAT 15",
  "heading": "In order to reduce emissions to water from flue-gas treatment, BAT is to use an appropriate combination of the techniques given below, and to use secondary techniques as close as possible to the source in order to avoid dilution.",
  "text": "The descriptions of the techniques are given in Section 8.6\nTechnique\nTypical pollutants prevented/abated\nApplicability\nPrimary techniques\na.\nOptimised combustion (see BAT 6) and flue-gas treatment systems (e.g. SCR/SNCR, see BAT 7)\nOrganic compounds, ammonia (NH3)\nGenerally applicable\nSecondary techniques\nb.\nAdsorption on activated carbon\nOrganic compounds, mercury (Hg)\nGenerally applicable\nc.\nAerobic biological treatment\nBiodegradable organic compounds, ammonium (NH4 +)\nGenerally applicable for the treatment of organic compounds. Aerobic biological treatment of ammonium (NH4 +) may not be applicable in the case of high chloride concentrations (i.e. around 10 g/l)\nd.\nAnoxic/anaerobic biological treatment\nMercury (Hg), nitrate (NO3 –), nitrite (NO2 –)\nGenerally applicable\ne.\nCoagulation and flocculation\nSuspended solids\nGenerally applicable\nf.\nCrystallisation\nMetals and metalloids, sulphate (SO4 2–), fluoride (F–)\nGenerally applicable\ng.\nFiltration (e.g. sand filtration, microfiltration, ultrafiltration)\nSuspended solids, metals\nGenerally applicable\nh.\nFlotation\nSuspended solids, free oil\nGenerally applicable\ni.\nIon exchange\nMetals\nGenerally applicable\nj.\nNeutralisation\nAcids, alkalis\nGenerally applicable\nk.\nOxidation\nSulphide (S2–), sulphite (SO3 2–)\nGenerally applicable\nl.\nPrecipitation\nMetals and metalloids, sulphate (SO4 2–), fluoride (F–)\nGenerally applicable\nm.\nSedimentation\nSuspended solids\nGenerally applicable\nn.\nStripping\nAmmonia (NH3)\nGenerally applicable\nThe BAT-AELs refer to direct discharges to a receiving water body at the point where the emission leaves the installation.\nTable 1\nBAT-AELs for direct discharges to a receiving water body from flue-gas treatment\nEither the BAT-AEL for TOC or the BAT-AEL for COD applies. TOC is the preferred option because its monitoring does not rely on the use of very toxic compounds.\nThis BAT-AEL applies after subtraction of the intake load.\nThis BAT-AEL only applies to waste water from the use of wet FGD.\nThis BAT-AEL only applies to combustion plants using calcium compounds in flue-gas treatment.\nThe higher end of the BAT-AEL range may not apply in the case of highly saline waste water (e.g. chloride concentrations ≥ 5 g/l) due to the increased solubility of calcium sulphate.\nThis BAT-AEL does not apply to discharges to the sea or to brackish water bodies.\nSubstance/Parameter\nBAT-AELs\nDaily average\nTotal organic carbon (TOC)\n20–50 mg/l\nChemical oxygen demand (COD)\n60–150 mg/l\nTotal suspended solids (TSS)\n10–30 mg/l\nFluoride (F–)\n10–25 mg/l\nSulphate (SO4 2–)\n1,3–2,0 g/l\nSulphide (S2–), easily released\n0,1–0,2 mg/l\nSulphite (SO3 2–)\n1–20 mg/l\nMetals and metalloids\nAs\n10–50 μg/l\nCd\n2–5 μg/l\nCr\n10–50 μg/l\nCu\n10–50 μg/l\nHg\n0,2–3 μg/l\nNi\n10–50 μg/l\nPb\n10–20 μg/l\nZn\n50–200 μg/l",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "footnote",
      "label": "f1",
      "text": "The descriptions of the techniques are given in Section 8.6"
    },
    {
      "type": "footnote",
      "label": "f2",
      "text": "Either the BAT-AEL for TOC or the BAT-AEL for COD applies. TOC is the preferred option because its monitoring does not rely on the use of very toxic compounds."
    },
    {
      "type": "footnote",
      "label": "f3",
      "text": "This BAT-AEL applies after subtraction of the intake load."
    },
    {
      "type": "footnote",
      "label": "f4",
      "text": "This BAT-AEL only applies to waste water from the use of wet FGD."
    },
    {
      "type": "footnote",
      "label": "f5",
      "text": "This BAT-AEL only applies to combustion plants using calcium compounds in flue-gas treatment."
    },
    {
      "type": "footnote",
      "label": "f6",
      "text": "The higher end of the BAT-AEL range may not apply in the case of highly saline waste water (e.g. chloride concentrations ≥ 5 g/l) due to the increased solubility of calcium sulphate."
    },
    {
      "type": "footnote",
      "label": "f7",
      "text": "This BAT-AEL does not apply to discharges to the sea or to brackish water bodies."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eudn/2017/1442/annex/division/1/division/1.5/division/3",
    "retrieved_at": "2026-11-01T15:13:23.628050+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."
}