{
  "url": "https://openlegislation.uk/eu-decision-2014-687/annex/division-9/division-1.1/division-1.1.5/division-bat+7",
  "json_url": "https://openlegislation.uk/eu-decision-2014-687/annex/division-9/division-1.1/division-1.1.5/division-bat+7.json",
  "legislation": "eudn/2014/687",
  "legislation_title": "Commission Implementing Decision of 26 September 2014 establishing the best available techniques (BAT) conclusions, under Directive 2010/75/EU of the European Parliament and of the Council, for the production of pulp, paper and board (notified under document C(2014) 6750) (Text with EEA relevance) (2014/687/EU)",
  "legislation_url": "https://openlegislation.uk/eu-decision-2014-687",
  "path": "annex/division/9/division/1.1/division/1.1.5/division/bat+7",
  "kind": "division",
  "number": "BAT 7",
  "heading": "In order to prevent and reduce the emission of odorous compounds originating from the waste water system, BAT is to use a combination of the techniques given below.",
  "text": "Technique\nI. Applicable for odours related to water systems closure\na\nDesign paper mill processes, stock and water storage tanks, pipes and chests in such a way as to avoid prolonged retention times, dead zones or areas with poor mixing in water circuits and related units, in order to avoid uncontrolled deposits and the decay and decomposition of organic and biological matter.\nb\nUse biocides, dispersants or of oxidising agents (e.g. catalytic disinfection with hydrogen peroxide) to control odour and decaying bacteria growth.\nc\nInstall internal treatment processes (‘kidneys’) to reduce the concentrations of organic matter and consequently possible odour problems in the white water system.\nII. Applicable for odours related to waste water treatment and sludge handling, in order to avoid conditions where waste water or sludge becomes anaerobic\na\nImplement closed sewer systems with controlled vents, using chemicals in some cases to reduce the formation of and to oxidise hydrogen sulphide in sewer systems.\nb\nAvoid over-aeration in equalisation basins but maintain sufficient mixing.\nc\nEnsure sufficient aeration capacity and mixing properties in aeration tanks; revise the aeration system regularly.\nd\nGuarantee proper operation of secondary clarifier sludge collection and return sludge pumping\ne\nLimit the retention time of sludge in sludge storages by sending the sludge continuously to the dewatering units.\nf\nAvoid the storage of waste water in the spill basin longer than is necessary; keep the spill basin empty.\ng\nIf sludge dryers are used, treatment of thermal sludge dryer vent gases by scrubbing and/or bio filtration (such as compost filters).\nh\nAvoid air cooling towers for untreated water effluent by applying plate heat exchangers.",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eudn/2014/687/annex/division/9/division/1.1/division/1.1.5/division/bat+7",
    "retrieved_at": "2026-11-01T15:14:38.312084+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."
}