OpenLegislation

Division BAT 47 In order to prevent or, where that is not practicable, to reduce emissions to water and to reduce water consumption, BAT is to use all of the techniques given below.

United Kingdom

Original text. Later amendments are not shown.

TechniqueDescriptionApplicability
(a)Techniques to prevent contamination of rain and surface run-off water

Rain and surface run-off water are kept separated from areas where treatment chemicals are stored or handled, from areas where freshly treated wood is stored and from contaminated water. This is achieved by using at least the following techniques:

  • drainage channels and/or an outer kerb bund around the plant;

  • roofing with roof guttering of areas where treatment chemicals are stored or handled (i.e. treatment chemicals’ storage area; treatment, post-treatment conditioning and interim storage areas; pipes and ductwork for treatment chemicals; creosote (re)conditioning facilities);

  • weather protection (e.g. roofing, tarpaulins) for the storage of treated wood in the event that it is required in the BPR authorisation for the wood preservative used for the treatment.

For existing plants, the applicability of drainage channels and an outer kerb bund may be restricted by the size of the plant area.
(b)Collection of potentially contaminated surface run-off waterSurface run-off water from areas that are potentially contaminated with treatment chemicals is collected separately. Collected waste water is discharged only after appropriate measures are taken e.g. monitor (see BAT 43), treat (see BAT 47 (e)), re-use (see BAT 47 (c).Generally applicable.
(c)Use of potentially contaminated surface run-off waterAfter its collection, potentially contaminated surface run-off water is used for the preparation of water-based wood preservative solutions.Only applicable to plants using water-based treatment chemicals. Applicability may be restricted by the quality requirements for its intended use.
(d)Reuse of cleaning waterWater used to wash equipment and containers is recovered and reused in the preparation of water-based wood preservative solutions.Only applicable to plants using water-based treatment chemicals.
(e)Treatment of waste waterWhere contamination in the collected surface run-off water and/or cleaning water is detected or can be expected, and where the use of the water is not feasible, the waste water is treated in an adequate waste water treatment plant (on or off site).Generally applicable.
(f)Disposal as hazardous wasteWhere contamination in the collected surface run-off water and/or cleaning water is detected or can be expected, and where the treatment or use of the water is not feasible, the collected surface run-off water and/or cleaning water is disposed of as hazardous waste.Generally applicable.